CN114212927B - Device and method for recycling slice wastewater - Google Patents
Device and method for recycling slice wastewater Download PDFInfo
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- CN114212927B CN114212927B CN202111551801.3A CN202111551801A CN114212927B CN 114212927 B CN114212927 B CN 114212927B CN 202111551801 A CN202111551801 A CN 202111551801A CN 114212927 B CN114212927 B CN 114212927B
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- 238000004064 recycling Methods 0.000 title claims abstract description 143
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Abstract
The invention discloses a slice wastewater recycling treatment and reuse device and method, comprising a silicon resource recovery system and a water resource reuse system, wherein the silicon resource recovery system comprises a slice wastewater adjusting unit, a slice wastewater conditioning unit and a double-groove filter pressing unit, the double-groove filter pressing unit is used for carrying out filter pressing on slice wastewater subjected to turbidity conditioning, and particle suspended matters in the slice wastewater subjected to turbidity conditioning are intercepted by filter cloth to obtain silicon mud, inner groove filter pressing liquid and outer groove filter pressing liquid; the water resource recycling system comprises a blending unit and a recycling unit, wherein the blending unit is used for performing RO water replenishing on the external tank pressure filtrate and blending new cutting fluid to obtain blended fluid; the invention has the advantages of high reaction speed, capability of preventing and removing filter pressing black liquid, high silicon powder recovery efficiency, capability of accurately controlling liquid supplementing amount by a recycling system and capability of meeting the requirement of recycling slices.
Description
Technical Field
The invention relates to a device and a method for recycling monocrystalline silicon slice wastewater, belonging to the field of water pollution control and resource recycling.
Background
The monocrystalline silicon slice is an important link of photovoltaic cell production, the process adopts a diamond wire cutting process which is mainstream in recent years, the cutting wire diameter is smaller, the discharged silicon powder particles are also finer, the slice cleaning process is more, the water consumption is large, and a large amount of silicon-containing wastewater is generated; in addition, in the process of the wire-electrode cutting reaction, the water-based wire-electrode cutting fluid has the functions of lubrication, temperature reduction and silicon slag discharge, and meanwhile, some metal particles, silicon chips and water can be brought into the cutting fluid, so that a slicing waste water discharge machine table is formed.
The pollutants in the slice wastewater mainly comprise suspended matters, organic matters, chromaticity, acid and alkali and the like. At present, the conventional process concept of slicing waste water is to remove silicon, and silicon particles in the waste water are separated by a chemical adding coagulation precipitation method or a filter pressing method so as to achieve the purpose of recycling silicon, and the waste water after silicon removal is discharged after being treated by comprehensive production waste water.
The traditional coagulation sedimentation silicon removal method has the following problems: the silicon powder has high density, the silicon powder after diamond wire cutting is very fine, the specific surface area is increased, the silicon powder is not easy to precipitate, and the silicon removal efficiency is low; the silicon powder which is not removed flows into a subsequent comprehensive wastewater unit, and the rear biochemical process is easy to be blocked; after adding medicine, coagulating and precipitating, the recycling value of the silicon powder is reduced.
The conventional pressure filtration silicon method has the following problems: the outlet water in the early stage of filter pressing can carry out a lot of silica powder, namely filter pressing black liquor, and the outlet water in the later stage can be slowly cleared through reflux reprocessing, but a filtrate reflux pump is added, so that the operation cost is high; in addition, a filter aid is added at the front stage of filter pressing, the method cannot accurately control the dosage, and on the contrary, the dosage often leads to filter cloth blockage, water is discharged too slowly, the filter cloth cleaning frequency is increased, and the treatment efficiency is reduced; in addition, in the filter pressing process, the black liquid is inevitably reappeared due to splashing and dripping caused by improper operation of personnel or leakage caused by breakage of plate and frame filter cloth, the black liquid can enter a liquid filtering tank again due to untimely discovery, removal and overhaul, silicon powder resources are lost along with the black liquid, and meanwhile, the later-stage treatment difficulty is increased; and the periodical shutdown or maintenance can increase more labor cost, and the serious shutdown can be caused, so that larger economic loss is caused.
Along with the increasingly urgent requirements of wastewater recycling treatment, the recycling of cutting fluid discharged into the later comprehensive treatment is also increasingly important. However, the current reuse technology of cutting fluid basically stays in the stage of simple filtration and rough fluid replacement, often the silicon powder in the cutting fluid is not thoroughly removed, and the new cutting fluid is too much or too little to be replaced, so that the cutting fluid of the reuse production line cannot meet the requirement, and the efficiency of silicon slicing is reduced.
At present, in the technology of slice wastewater treatment and recycling, the main problems are as follows: the silicon removal efficiency by the dosing method is low, the silicon powder recovery quality is not high, the filter pressing black liquid frequently appears, the index of filtrate water outlet is unstable, the load of the later-stage wastewater treatment is high, and the operation cost is high; the recovery and cyclic utilization process of the cutting fluid is complex in operation, lacks effective control parameters and methods, does not reach the standard of the circulating fluid, has low production efficiency and the like.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides the recycling device and the recycling method for the slice wastewater, which can automatically control, accurately feed the medicine, quickly and accurately position the black liquid source, do not need filtrate reflux equipment, and have the advantages of high recovery rate of crystalline silicon, simple operation and low running cost.
The technical scheme is as follows: in order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a section waste water resourceful treatment recycling device, includes silicon resource recovery system and water resource recycling system, silicon resource recovery system includes section waste water adjustment unit, section waste water quenching and tempering unit and double tank filter-pressing unit, wherein:
the slice wastewater adjusting unit is used for stirring slice wastewater raw water, UV disinfection blending liquid and external tank pressure filtrate to obtain stirred slice wastewater.
The slice wastewater conditioning unit is used for firstly carrying out pH adjustment on the stirred slice wastewater to obtain the slice wastewater with the pH adjusted. And then carrying out turbidity tempering on the slice wastewater subjected to pH adjustment to obtain the slice wastewater subjected to turbidity tempering.
The double-groove filter pressing unit is used for carrying out filter pressing on the slice wastewater after turbidity tempering, and particle suspended matters in the slice wastewater after turbidity tempering are intercepted by filter cloth to obtain silicon mud, inner groove pressure filtrate and outer groove pressure filtrate. And the silicon mud is discharged into a silicon mud bin, the filter pressing liquid in the inner groove returns to the slice wastewater adjusting unit, and the filter pressing liquid in the outer groove enters into the water resource recycling system.
The water resource recycling system comprises a blending unit and a recycling unit, wherein:
the blending unit is used for performing RO water supplementing and new cutting fluid blending on the external tank pressure filtrate to obtain blending fluid.
The recycling unit is used for carrying out UV disinfection on the obtained blending liquid to obtain the UV disinfection blending liquid.
Preferably: the double-groove filter pressing unit comprises a back-blowing module, wherein the back-blowing module is used for introducing compressed air, high-pressure air passes through a filter cake, water in the filter cake is further separated to obtain back-blowing reflux liquid, and the back-blowing reflux liquid flows back to the slice wastewater adjusting unit. The slice wastewater adjusting unit is used for stirring slice wastewater raw water, UV disinfection blending liquid, external tank pressure filtrate and back-blowing reflux liquid to obtain stirred slice wastewater.
Preferably: the double-groove filter pressing unit comprises a pressing module, wherein the pressing module is used for injecting high-pressure tap water serving as a pressing medium into an elastic membrane plate between filter cloth and a filter plate when feeding is finished, so that the filter cloth is expanded and deformed, the filter cake is further dehydrated due to pressing, and water after the pressing is finished flows back to a tap water storage system.
Preferably: the allocation formula of the allocation unit comprises the following steps:
wherein: q (Q) RO Represents RO water supplementing amount, Q CN Represents the water supplementing quantity of new cutting fluid, Q CW Represents the flow rate of liquid into the dispensing unit, K S Represents the sludge water loss coefficient of the double-groove filter pressing unit, P represents the water content of filter-pressed sludge of the double-groove filter pressing unit, and Q f Represents the flow of raw water of slice wastewater, C f Represents the concentration of suspended matters in raw water of slicing wastewater, C r Represents the concentration of suspended matters, K, of the filtrate at the external tank pressure DU Represents the dilution factor, pH of the fresh cutting fluid 1 Indicating the pH of the liquid entering the dosing unit, pH 2 Indicating the pH value of the prepared solution prepared by the preparation unit, E 1 Indicating the conductivity of the liquid entering the dosing unit E 2 Representing deploymentConductivity, T, of prepared solution prepared by units b1 Represents the turbidity of the filtrate of the external tank pressure, T b2 Indicating the turbidity of the prepared liquid prepared by the preparation unit.
Preferably: slice waste water adjusting unit includes the equalizing basin, slice waste water quenching and tempering unit includes quenching and tempering jar, double flute filter-pressing unit includes the membrane filter press, wherein:
The adjusting tank is provided with a water inlet pipeline, the adjusting tank is communicated with the tempering tank through a water inlet pipe of the tempering tank, and the water inlet pipe of the tempering tank is provided with an adjusting tank lifting pump.
The quenching and tempering tank is provided with a feeding pipe A, and the feeding pipe A is provided with a feeding automatic valve. And a tempering tank pH meter is arranged in the tempering tank. The tempering tank is communicated with a feed return port of the membrane filter press through a tempering feed pipe. And the tempering feeding pipe is sequentially provided with a tempering feeding pump and a first valve along the water flow direction. And a tempering feeding pipe between the tempering feeding pump and the first valve is communicated with one end of a blowback feeding pipe, and the other end of the blowback feeding pipe is communicated with the regulating tank.
The membrane filter press is communicated with the regulating tank through an inner groove converging pipe, the membrane filter press is communicated with the middle tank through an outer groove discharging pipe, and an outer groove turbidimeter and an outer groove discharging valve are arranged on the outer groove discharging pipe. One end of an outer groove reflux pipe is connected to an outer groove discharge pipe between the outer groove turbidimeter and the outer groove discharge valve, the other end of the outer groove reflux pipe is communicated with an inner groove converging pipe, and the outer groove reflux pipe is provided with an outer groove reflux valve.
Preferably: the water tank comprises a middle tank, a middle tank water outlet pipe is arranged on the middle tank, a middle tank lifting pump is arranged at one end, close to the middle tank, of the middle tank water outlet pipe, and a middle tank flowmeter, a middle tank pH meter and a middle Chi Diandao meter are arranged at one end, far away from the middle tank, of the middle tank water outlet pipe. The water outlet end of the water outlet pipe of the middle tank is connected with a system discharge pipe, and a system discharge valve is arranged on the system discharge pipe.
Preferably: the blending unit comprises a pre-blending filter tank, a blending tank and a post-blending filter tank, and the recycling unit comprises a recycling pool, a UV sterilizer, a recycling filter tank and a water point for a machine.
The filter tank is provided with a filter tank water inlet pipe before deployment, a front filter tank flushing port and a front filter tank discharge port, and the filter tank water inlet pipe before deployment is communicated with the water outlet end of the middle tank water outlet pipe. The front filter tank discharge port is communicated with a flushing discharge pipe, and the flushing discharge pipe is communicated with an inner groove converging pipe.
The preparation tank is provided with an RO water supplementing pipe, a new cutting fluid feeding pipe, a preparation tank water inlet pipe and a preparation tank water outlet pipe, and the preparation tank water inlet pipe is communicated with a discharge hole of the filter tank before preparation. The utility model discloses a blending tank, including blending tank outlet pipe, blending tank bypass valve, blending tank outlet pipe, blending tank and blending tank, the one end that blending tank outlet pipe is close to the blending tank is provided with blending tank elevator pump, the one end that blending tank outlet pipe kept away from the blending tank is provided with blending tank outlet pH meter, blending tank outlet conductance meter, blending tank outlet turbidity meter, be provided with the blending tank bypass pipe on the blending tank outlet pipe, be provided with the blending tank bypass valve on the blending tank bypass pipe. The water outlet pipe of the blending tank is provided with a blending tank reflux pipe, the blending tank reflux pipe is provided with a blending tank reflux valve, and the water outlet of the blending tank reflux pipe is communicated with the blending tank.
The blended filtering tank is provided with a rear filtering tank inlet, a rear filtering tank flushing port, a rear filtering tank discharge port and a rear filtering tank discharge port, the inlet of the back filter tank is communicated with the water outlet pipe of the blending tank, the inlet of the back filter tank is provided with a water inlet valve of the back filter tank, and the discharge port of the back filter tank is communicated with the flushing discharge pipe.
The recycling pool is provided with a recycling pool water inlet pipe, a recycling pool water outlet pipe and a water consumption point return pipe, the recycling pool water inlet pipe is communicated with a rear filter tank discharge port of the blended rear filter tank, the water consumption point return pipe is communicated with a machine water consumption point, and a return pipe back pressure valve is arranged on the water consumption point return pipe. And one end of the water outlet pipe of the recycling pool, which is close to the recycling pool, is provided with a recycling pool lifting pump.
The UV sterilizer is provided with a sterilizer liquid inlet pipe and a sterilizer liquid outlet pipe, the sterilizer liquid inlet pipe is communicated with a recycling pool water outlet pipe, the sterilizer liquid inlet pipe is provided with a sterilizer liquid inlet valve, and the sterilizer liquid outlet pipe is provided with a sterilizer liquid outlet valve.
The recycling filter tank is provided with a recycling filter tank water inlet pipe and a recycling filter tank water outlet pipe, and the recycling filter tank water inlet pipe is respectively communicated with the sterilizer liquid outlet pipe and the recycling pool water outlet pipe.
The water point for the machine is provided with a water point water inlet pipe, a water point return port and a water inlet pipe orifice, the water point water inlet pipe is communicated with a water outlet pipe of a recycling filter tank of the recycling filter tank, the water point return port is communicated with the water point return pipe, and the water inlet pipe orifice is communicated with a water inlet pipeline.
Preferably: the membrane filter press comprises a left side pressure filter structure and a right side pressure filter structure, wherein the left side pressure filter structure comprises a left side outer groove water nozzle valve, a left side inner groove water nozzle valve, a left side outer groove, a left side inner groove, a left side outer groove liquid receiving pipe and a left side inner groove liquid receiving pipe, the left side outer groove water nozzle valve is connected with the left side outer groove, the left side inner groove water nozzle valve is connected with the left side inner groove, the left side outer groove liquid receiving pipe is arranged on the left side outer groove, and the left side inner groove liquid receiving pipe is arranged on the left side inner groove. The left side outer tank liquid receiving pipe is communicated with the outer tank converging pipe, the outer tank converging pipe is communicated with the outer tank discharging pipe, and the left side inner tank liquid receiving pipe is communicated with the inner tank converging pipe. The right side pressure filter structure comprises a right side outer groove water nozzle valve, a right side inner groove water nozzle valve, a right side outer groove, a right side inner groove, a right side outer groove liquid receiving pipe and a right side inner groove liquid receiving pipe, wherein the right side outer groove water nozzle valve is connected with the right side outer groove, the right side inner groove water nozzle valve is connected with the right side inner groove, the right side outer groove liquid receiving pipe is arranged on the right side outer groove, and the right side inner groove liquid receiving pipe is arranged on the right side inner groove. The right outer groove liquid receiving pipe is communicated with the outer groove converging pipe, the outer groove converging pipe is communicated with the outer groove discharging pipe, and the right inner groove liquid receiving pipe is communicated with the inner groove converging pipe.
A recycling method of slice wastewater comprises the following steps:
step 1, discharging slice wastewater with silicon powder particles into an adjusting tank through a water inlet pipeline, arranging a stirrer in the tank, stirring the slice wastewater through the stirrer, pumping the slice wastewater into a conditioning tank through a lifting pump of the adjusting tank for pH adjustment, adding a pH conditioning agent A through an adding pipe A, and controlling the pH value in the tank to be not more than 6.5 by linkage of the pH meter of the conditioning tank and an adding automatic valve. And (3) adding a turbidity modifier B through an adding pipe B, and performing turbidity modification on the pH-adjusted slice wastewater to obtain the turbidity-modified slice wastewater.
And 2, pumping the turbidity-conditioned slice wastewater into a membrane filter press for primary filtration by using a conditioning feed pump, controlling the opening degree of a metering pump connected with a feeding pipe B according to the concentration of the influent SS to control the feeding amount, opening inner groove water nozzle valves at two sides of the membrane filter press, discharging the pressurized filtrate from an inner groove liquid receiving pipe to an inner groove converging pipe from an inner groove, and returning to a regulating tank through the inner groove converging pipe.
And 3, enabling the quenched and tempered slice wastewater to enter a feed inlet of a filter press through a quenching and tempering feed pump, tightly arranging filter plates in a row under the action of pressure, forming a filter chamber between the filter plates, pressing the wastewater into the filter chamber, wherein solid particles and suspended matters are partially trapped by filter cloth to form a filter cake, and discharging the liquid part from the filter chamber through filter pressing liquid. The squeezing opening is connected with a tap water system, and after further squeezing the water content of the filter cake, the squeezing water is recycled and discharged into the tap water system. The back-blowing port is connected with compressed air to further wind and dehydrate the filter cake, and the back-blowing liquid is discharged into the regulating tank through the feed back port. After dehydration is completed, the pressing force of the filter plates is relieved, the filter plates are automatically pulled one by one, and the filter chambers are respectively opened for discharging mud.
And 4, allowing the filter pressing liquid after silicon removal to enter an intermediate tank, and sequentially entering a filter tank before blending, a blending tank and a filter tank after blending. The consumption of the cutting fluid is supplemented by monitoring the pH value, the conductivity value and the flow value of the outer tank turbidity meter and the middle tank water outlet pipe:
wherein: q (Q) RO Represents RO water supplementing amount, Q CN Represents the water supplementing quantity of new cutting fluid, Q CW Represents the flow rate of liquid into the dispensing unit, K S Represents the sludge water loss coefficient of the double-groove filter pressing unit, and P represents the double-groove filter pressingThe water content of filter-pressed sludge of the unit, Q f Represents the flow of raw water of slice wastewater, C f Represents the concentration of suspended matters in raw water of slicing wastewater, C r Represents the concentration of suspended matters, K, of the filtrate at the external tank pressure DU Represents the dilution factor, pH of the fresh cutting fluid 1 Indicating the pH of the liquid entering the dosing unit, pH 2 Indicating the pH value of the prepared solution prepared by the preparation unit, E 1 Indicating the conductivity of the liquid entering the dosing unit E 2 Indicating the conductivity, T, of the prepared liquid prepared by the preparation unit b1 Represents the turbidity of the filtrate of the external tank pressure, T b2 Indicating the turbidity of the prepared liquid prepared by the preparation unit.
Obtaining RO water supplementing quantity (consumption water quantity) in real time according to a formula (1), and adopting secondary RO concentrated water recycled in a wastewater station as supplementing water, wherein RO water supplementing quantity Q RO Control associated with RO water replenishing system, control replenishing amount Q of new cutting fluid according to formula (2) CN And (3) opening a blending tank lifting pump, controlling a back valve of the pump, opening a blending tank reflux valve, closing a back filtering tank water inlet valve and a blending tank bypass valve, controlling the supplementing amount of new cutting fluid, opening a new cutting fluid feeding pipe, closing a blending tank reflux pipeline, opening a back filtering tank water inlet valve, and finishing blending to obtain blending fluid.
And 5, filtering the blended liquid by using a filtering tank after blending, discharging the filtered blended liquid into a recycling pool for standby, pumping the recycling water into a UV sterilizer by using a recycling pool lifting pump, and recycling the water to a water point of a machine after flowing through the recycling filtering tank.
Preferably: the pH modifier A is 10-15% of citric acid. The turbidity modifier B comprises a solution of silicon aluminum oxide.
Compared with the prior art, the invention has the following beneficial effects:
1. the filter pressing clear liquid outflow control mode is improved, a filter pressing double-groove structure is adopted, the double-groove structure is simple and practical, the installation is convenient, the control mode is optimized, the accurate dosing can be realized, the filter cloth leakage point can be rapidly and accurately removed, and the filter pressing black liquid can be timely found and removed; the outer tank is automatically controlled to normally run liquid or reflux when abnormal according to the turbidity value, and the flushing section is controlled to reflux; the inner tank is black liquid effluent of the initial and abnormal investigation, emergency, maintenance and flushing sections; the recovery rate of silica powder is high, the effluent index of filtrate is stable, the system operation is simple, and the running cost is low.
2. The recycling section adopts multistage fine filtration, combines a double-tank control flushing program to improve the recovery rate of silicon powder in an omnibearing way, and automatically controls the adding and supplementing quantity of the blending agent of the recycling system through on-line monitoring of water quality parameters and accurate calculation.
3. The silicon recovery part of the invention is not added with chemical agents except for regulating pH and adding medicines, and the recovery quality of silicon powder is high; after the silicon of the cutting fluid is removed, new cutting fluid is prepared, the cutting fluid enters the recycling treatment and returns to the water point of the machine to be recycled, and the wastewater is discharged near zero. The invention has wide application range and simple operation, realizes the maximization of resources while treating water pollution, and has obvious environmental and social benefits.
4. The reaction speed is high, the filter-press black liquid can be prevented and removed, the silicon powder recovery efficiency is high, the degree of automation is high, the solid content of the filtered sludge is high, and the recovery quality of silicon resources is high; the filter pressing clear liquid treated by the system is subjected to advanced treatment such as blending, filtering, disinfection and the like to be recycled, and the recycling system can accurately control the liquid supplementing amount and meet the requirement of recycling the slices. The invention can be applied to filter pressing and recycling treatment of other industrial wastewater, not only can avoid turbid liquid in the early stage of filter pressing, but also can timely monitor and cope with various abnormal conditions affecting clear liquid outflow in the filter pressing process through the control of an automatic program.
Drawings
FIG. 1 is a flow chart of an embodiment silicon resource recovery process.
FIG. 2 is a flow chart of a water resource recycling process.
FIG. 3 is a schematic view of a double tank section of a filter press.
Reference numerals illustrate:
1. 12, a regulating tank lifting pump, 121, a tempering tank water inlet pipe, 21 and a water inlet pipeline.
2. 13 tempering tanks, 17 tempering feed pumps, 17 feeding pipes A and 171, feeding automatic valves, 18 feeding pipes B and 201, a pH meter of the tempering tanks, 22 tempering feed pipes, 221 and a back blowing feed pipe.
3. The membrane filter press comprises a membrane filter press, 23, an outer tank converging pipe, 231, an outer tank turbidimeter, 24, an inner tank converging pipe, 25, an outer tank discharging pipe, 251, an outer tank discharging valve, 26, an outer tank return pipe, 261, an outer tank return valve, 301, a feeding return port, 302, a squeezing port, 3031, a flap liquid outlet 1, 3032, a flap liquid outlet 2, 3033, a flap liquid outlet pipe, 310, a high-pressure cleaning port, 311, a blowback port, 3041, a left outer tank water nozzle valve, 3042, a right outer tank water nozzle valve, 3051, a left inner tank water nozzle valve, 3052, a right inner tank water nozzle valve, 3061, a left outer tank 3062, a right outer tank water nozzle valve, 3071, a left inner tank 3072, a right inner tank, 3081, a left outer tank water nozzle pipe, 3082, a right outer tank water nozzle pipe, 3091, a left inner tank water nozzle pipe, 3092 and a right inner tank water nozzle pipe.
4. The system comprises a middle tank, 14, a middle tank lifting pump, 27, a middle tank water outlet pipe, 271, a middle tank flowmeter, 272, a middle tank pH meter, 273, a middle Chi Diandao meter, 281, a system discharge pipe, 2811 and a system discharge valve.
5. 241, flushing discharge pipe, 28, water inlet pipe, 51, flushing port, 52 and discharge port.
6. The device comprises a blending tank, 15 parts of a blending tank lifting pump, 19 parts of an RO water supplementing pipe, 20 parts of a new cutting fluid feeding pipe, 29 parts of a blending tank water inlet pipe, 30 parts of a blending tank water outlet pipe, 3001 parts of a blending tank water outlet pH meter, 3002 parts of a blending tank water outlet conductivity meter, 3003 parts of a blending tank water outlet turbidity meter, 3004 parts of a blending tank reflux valve, 3005 parts of a post-filtering tank water inlet valve, 3006 parts of a blending tank bypass valve.
7. Blending the rear filter tank, 71, a rear filter tank flushing port, 72 and a rear filter tank discharging port.
8. 16 recycling tanks, a recycling tank lifting pump, 31 recycling tank water inlet pipes, 32 recycling tank water outlet pipes, 351, a return pipe back pressure valve, 35 and a water point return pipe.
9. A UV sterilizer.
10. And 33 parts of a recycling filter tank and a water inlet pipe of the recycling filter tank.
11. Water point for machine, 34, water inlet pipe for water point.
Detailed Description
The present invention is further illustrated in the accompanying drawings and detailed description which are to be understood as being merely illustrative of the invention and not limiting of its scope, and various equivalent modifications to the invention will fall within the scope of the appended claims to the skilled person after reading the invention.
The utility model provides a section waste water resourceful treatment retrieval and utilization device, as shown in fig. 1 and 2, includes silicon resource recovery system and water resource retrieval and utilization system, silicon resource recovery system includes section waste water adjustment unit, section waste water quenching and tempering unit and double tank filter-pressing unit, wherein:
the slice wastewater adjusting unit is used for stirring slice wastewater raw water, UV disinfection blending liquid and external tank pressure filtrate to obtain stirred slice wastewater.
The slice wastewater conditioning unit is used for firstly carrying out pH adjustment on the stirred slice wastewater to obtain the slice wastewater with the pH adjusted. And then carrying out turbidity tempering on the slice wastewater subjected to pH adjustment to obtain the slice wastewater subjected to turbidity tempering.
The double-groove filter pressing unit is used for carrying out filter pressing on the slice wastewater after turbidity tempering, and particle suspended matters in the slice wastewater after turbidity tempering are intercepted by filter cloth to obtain silicon mud, inner groove pressure filtrate and outer groove pressure filtrate. And the silicon mud is discharged into a silicon mud bin, the filter pressing liquid in the inner groove returns to the slice wastewater adjusting unit, and the filter pressing liquid in the outer groove enters into the water resource recycling system.
Slice waste water adjusting unit includes equalizing basin 1, slice waste water quenching and tempering unit includes quenching and tempering jar 2, double flute filter-pressing unit includes diaphragm filter press 3, wherein:
The adjusting tank 1 is provided with a water inlet pipeline 21, the adjusting tank 1 is communicated with the tempering tank 2 through a tempering tank water inlet pipe 121, and the tempering tank water inlet pipe 121 is provided with an adjusting tank lifting pump 12.
The quenching and tempering tank 2 is provided with a feeding pipe A17, and the feeding pipe A17 is provided with a feeding automatic valve 171. A conditioning tank pH meter 201 is provided in the conditioning tank 2. The tempering tank 2 is communicated with a feed return port 301 of the membrane filter press 3 through a tempering feed pipe 22. The tempering feed pipe 22 is sequentially provided with a tempering feed pump 13 and a first valve along the water flow direction. The tempering feeding pipe 22 between the tempering feeding pump 13 and the first valve is communicated with one end of a blowback feeding pipe 221, and the other end of the blowback feeding pipe 221 is communicated with the regulating tank 1.
The membrane filter press 3 is provided with 6 flange interfaces, and comprises a feeding port, a back blowing feed port, a squeezing port connected with a high-pressure tap water circulating system, a cleaning port connected with a high-pressure cleaning system, a back blowing port connected with a compressed air system, a turning plate liquid outlet communicated with a turning plate liquid outlet pipe, a turning plate liquid outlet communicated with an inner groove converging pipe, the membrane filter press 3 is communicated with the regulating tank 1 through the inner groove converging pipe 24, the membrane filter press 3 is communicated with the middle tank 4 through an outer groove discharging pipe 25, and an outer groove turbidimeter 231 and an outer groove discharging valve 251 are arranged on the outer groove discharging pipe 25. An outer tank return pipe 26 is connected to an outer tank discharge pipe 25 between the outer tank turbidimeter 231 and the outer tank discharge valve 251, the other end of the outer tank return pipe 26 is communicated with an inner tank converging pipe 24, and an outer tank return valve 261 is arranged on the outer tank return pipe 26. The automatic water-washing high-pressure membrane filter press adopted by the membrane filter press is provided with an automatic pulling plate and an automatic liquid receiving turning plate, can automatically wash filter cloth, and is provided with neck flanges at all interfaces of the filter press. The two sides of the bottom of the filter plate of the membrane filter press are provided with an inner liquid receiving groove and an outer liquid receiving groove, the width ratio of the inner liquid receiving groove to the outer liquid receiving groove is 2:3, the total width is 1000mm, and the membrane filter press is made of stainless steel. The pressure filtration liquid receiving double grooves are provided with a certain gradient along the length direction of the frame, the groove depth at the initial end is 300mm, and the groove depth at the tail end is 350-400 mm; the liquid receiving pipes are arranged at the tail ends of the double grooves, and the two side liquid receiving pipes of the double grooves are communicated and converged and then discharged or reflowed. The first movable cover plate is arranged at the top of the inner groove, the second movable cover plate is arranged at the top of the outer groove, and the movable opening and closing of the cover plates can be controlled manually and automatically. The membrane filter press is provided with a double water nozzle for discharging liquid, the membrane filter press is positioned above the double grooves, the outer water nozzle is connected with the outer groove, and the inner water nozzle is connected with the inner groove; wherein the inner tank water nozzle valve is normally closed, the outer tank water nozzle valve is normally open, and an outer tank turbidity meter is arranged on the outer tank discharge pipe to automatically control the outflow direction of the outer tank. The flushing and splashing liquid of the filter pressing flushing system can be discharged from the inner tank, and the turning plate liquid is connected with the liquid discharged from the inner tank to be discharged.
The double-groove filter pressing unit comprises a pressing module and a back-flushing module, wherein the back-flushing module is used for introducing compressed air, high-pressure air passes through a filter cake, water in the filter cake is further separated to obtain back-flushing reflux liquid, and the back-flushing reflux liquid flows back to the slice wastewater adjusting unit. The slice wastewater adjusting unit is used for stirring slice wastewater raw water, UV disinfection blending liquid, external tank pressure filtrate and back-blowing reflux liquid to obtain stirred slice wastewater. When the feeding is finished, the squeezing module is used for injecting high-pressure tap water serving as a squeezing medium into the elastic membrane plate between the filter cloth and the filter plate, so that the filter cloth expands and deforms, the filter cake is further dehydrated due to squeezing, and water after the squeezing is finished flows back to the tap water storage system.
As shown in fig. 3, the membrane filter press 3 includes a left side filtering structure and a right side filtering structure, the left side filtering structure includes a left side outer tank water nozzle valve 3041, a left side inner tank water nozzle valve 3051, a left side outer tank 3061, a left side inner tank 3071, a left side outer tank liquid receiving pipe 3081, a left side inner tank liquid receiving pipe 3091, the left side outer tank water nozzle valve 3041 is connected to the left side outer tank 3061, the left side inner tank water nozzle valve 3051 is connected to the left side inner tank 3071, the left side outer tank liquid receiving pipe 3081 is arranged on the left side outer tank 3061, and the left side inner tank liquid receiving pipe 3091 is arranged on the left side inner tank 3071. The left outer tank joint pipe 3081 communicates with the outer tank joint pipe 23, the outer tank joint pipe 23 communicates with the outer tank discharge pipe 25, and the left inner tank joint pipe 3091 communicates with the inner tank joint pipe 24. The right pressure filtering structure comprises a right outer tank water nozzle valve 3042, a right inner tank water nozzle valve 3052, a right outer tank 3062, a right inner tank 3072, a right outer tank liquid receiving pipe 3082 and a right inner tank liquid receiving pipe 3092, wherein the right outer tank water nozzle valve 3042 is connected with the right outer tank 3062, the right inner tank water nozzle valve 3052 is connected with the right inner tank 3072, the right outer tank liquid receiving pipe 3082 is arranged on the right outer tank 3062, and the right inner tank liquid receiving pipe 3092 is arranged on the right inner tank 3072. The right outer tank joint pipe 3082 communicates with the outer tank joint pipe 23, the outer tank joint pipe 23 communicates with the outer tank discharge pipe 25, and the right inner tank joint pipe 3092 communicates with the inner tank joint pipe 24.
As shown in fig. 1, the upper end of the middle tank is connected with an outer tank discharge pipe through water inlet, and the lower end of the middle tank is connected with a middle tank lifting pump; after the water outlet pipe of the middle tank is connected with each function monitoring instrument, the water outlet is divided into 2 paths, one path is a system discharge pipe which is discharged to a waste water station, and the other path is connected with the water inlet pipe of the filter tank before the allocation and enters the back-section water resource recycling system. Specifically, the middle tank 4 is provided with a middle tank water outlet pipe 27, one end of the middle tank water outlet pipe 27, which is close to the middle tank 4, is provided with a middle tank lifting pump 14, and one end of the middle tank water outlet pipe 27, which is far away from the middle tank 4, is provided with a middle tank flowmeter 271, a middle tank pH meter 272 and a middle Chi Diandao meter 273. The water outlet end of the middle tank water outlet pipe 27 is connected with a system discharge pipe 281, and a system discharge valve 2811 is arranged on the system discharge pipe 281. The system discharge valve 2811 is a pneumatic butterfly valve, and is in linkage with the pH meter and the conductivity meter of the intermediate tank to control the discharge water of the system.
The water resource recycling system comprises a blending unit and a recycling unit, wherein:
the blending unit is used for performing RO water supplementing and new cutting fluid blending on the external tank pressure filtrate to obtain blending fluid.
The recycling unit is used for carrying out UV disinfection on the obtained blending liquid to obtain the UV disinfection blending liquid.
The blending unit comprises a pre-blending filter tank 5, a blending tank 6 and a post-blending filter tank 7, and the recycling unit comprises a recycling pool 8, a UV sterilizer 9, a recycling filter tank 10 and a machine water point 11.
The filter tank 5 before the allocation is provided with a filter tank water inlet pipe 28 before the allocation, a filter tank flushing port 51 and a filter tank discharge port 52 before the allocation, and the filter tank water inlet pipe 28 before the allocation is communicated with the water outlet end of the middle tank water outlet pipe 27. The front canister drain 52 communicates with a flush drain 241, the flush drain 241 communicating with the inner tank junction 24.
The mixing tank 6 is provided with an RO water supplementing pipe 19, a new cutting fluid dosing pipe 20, a mixing tank water inlet pipe 29 and a mixing tank water outlet pipe 30, and the mixing tank water inlet pipe 29 is communicated with a discharge hole of the filtering tank 5 before mixing. The one end that the blending tank outlet pipe 30 is close to blending tank 6 is provided with blending tank elevator pump 15, the one end that blending tank outlet pipe 30 kept away from blending tank 6 is provided with blending tank play water pH meter 3001, blending tank play water conductivity meter 3002, blending tank play water turbidimeter 3003, be provided with the blending tank by-pass on the blending tank outlet pipe 30, be provided with blending tank by-pass valve 3006 on the blending tank by-pass. The water outlet pipe 30 of the blending tank is provided with a blending tank return pipe, the blending tank return pipe is provided with a blending tank return valve 3004, and the water outlet of the blending tank return pipe is communicated with the blending tank 6.
The blending back filter tank 7 is provided with a back filter tank inlet, a back filter tank flushing port 71, a back filter tank discharge port 72 and a back filter tank discharge port, the back filter tank inlet is communicated with the blending tank water outlet pipe 30, the back filter tank inlet is provided with a back filter tank water inlet valve 3005, and the back filter tank discharge port 72 is communicated with the flushing discharge pipe 241. Stainless steel filter elements are adopted for the filtering tanks before and after the preparation, and the filtering tanks can be repeatedly washed manually or automatically, and the filtering precision is respectively 10 mu m and 3 mu m.
The recycling tank 8 is provided with a recycling tank water inlet pipe 31, a recycling tank water outlet pipe 32 and a water consumption point return pipe 35, the recycling tank water inlet pipe 31 is communicated with a rear filter tank discharge port of the blended rear filter tank 7, the water consumption point return pipe 35 is communicated with the machine water consumption point 11, and the water consumption point return pipe 35 is provided with a return pipe back pressure valve 351. The recycling pool water outlet pipe 32 is provided with a recycling pool lifting pump 16 at one end close to the recycling pool 8.
The UV sterilizer 9 is provided with a sterilizer liquid inlet pipe and a sterilizer liquid outlet pipe, the sterilizer liquid inlet pipe is communicated with the recycling pool water outlet pipe 32, the sterilizer liquid inlet pipe is provided with a sterilizer liquid inlet valve, and the sterilizer liquid outlet pipe is provided with a sterilizer liquid outlet valve.
The recycling filter tank 10 is provided with a recycling filter tank water inlet pipe 33 and a recycling filter tank water outlet pipe, and the recycling filter tank water inlet pipe 33 is respectively communicated with a sterilizer liquid outlet pipe and a recycling pool water outlet pipe 32.
The water point for the machine is provided with a water point water inlet pipe 34, a water point return port and a water inlet pipe orifice, the water point water inlet pipe 34 is communicated with a water outlet pipe of the recycling filter tank 10, the water point return port is communicated with a water point return pipe 35, and the water inlet pipe orifice is communicated with the water inlet pipeline 21.
The slice wastewater flows into the regulating tank through a pipeline to be homogenized and uniform, and then enters the tempering tank to be subjected to tempering and filter pressing. The system automatically controls the adding amount and time of the conditioner, the primary filtered water in the early stage of the filter press returns to the regulating tank through the inner tank of the filter pressing reconstruction structure, the waste water in the normal operation stage is effectively intercepted by the filter cloth through the high-pressure diaphragm plate and frame filter pressing, suspended matters such as silicon powder and the like are effectively intercepted by the filter cloth, the formed silicon mud is recovered, and clear liquid flows into the middle tank for reuse. The recycling section optimizes multi-stage filtration, and the adding and supplementing amount of the blending agent is automatically controlled through on-line monitoring of water quality parameters and accurate calculation. The invention improves the control mode of the outflow of the clear liquid of the filter pressing, adopts a filter pressing double-groove structure, the outer groove automatically controls to normally run to perform liquid outflow or reflux when abnormal according to the turbidity value, and the flushing section controls to reflux; the inner tank is black liquid effluent of the initial and abnormal detection, emergency, maintenance and flushing sections.
The control system for recycling the slice wastewater comprises 8 sections of control programs of conditioning, running, checking, emergency, maintaining, flushing, blending and recycling, can avoid filter pressing black liquid, maximally recycle and utilize silicon powder and cutting liquid resources, and comprises the following specific program control steps:
(1) And (3) hardening and tempering: internal groove opening
The slice wastewater is discharged into the regulating tank through the water inlet pipeline, the lifting pump of the regulating tank and the water inlet pipeline of the conditioning tank are started, the dosing system is started, the start and stop time of the citric acid dosing metering pump is automatically controlled according to the pH value measured by the conditioning tank, and the pH value is kept to be 6.0-6.5. And (3) putting the solution of the conditioning agent B with the concentration of 20-30% into a conditioning feed pipe at regular time and quantity by using a mechanical diaphragm metering pump, starting a conditioning feed pump, and performing primary filtration of a filter press. The control section is characterized in that the outer tank water nozzle valve is closed, the inner tank water nozzle valve is opened, the outer tank cover plate is completely closed, and the inner tank cover plate is completely opened. The addition amount of the conditioner B is determined by the concentration of the suspension in water, the addition time is 3min, and the program control principle is as follows: SS <15000, and the addition and measurement value is 0.5-1.5%;15000< SS <25000, and the addition and taking value is 1.5-2.0%. The turbidity modifier B is added in a pipeline mixing mode, the concentration of W is 20-30%, and the adding of a metering pump is controlled according to time setting; the adding amount of the conditioning agent W is 0.5-2.0% of the volume flow of the slice wastewater, the adding time is 3min, and the SS content of the slice wastewater controls the adding concentration of W.
(2) And (3) an operation section: outer groove arrangement
Closing a dosing pipeline of the conditioner B, closing an inner tank water nozzle valve, opening an outer tank water nozzle valve, normally filtering and pressing out liquid, and normally displaying a value of 60-80 by an outer tank turbidimeter, wherein an outer tank discharge valve is opened at the stage, and a return pipe valve is closed. The inner groove cover plate of the operation section is completely closed, and the outer groove cover plate is completely opened.
(3) An investigation section: the inner groove of the filter cloth is opened and the outer part is opened
When the value NTU of the external groove turbidity meter is more than 100, the external groove discharge valve is automatically closed, and the external groove reflux valve is opened; the water nozzle for manually checking abnormal liquid outlet of the filter press finds out the problem filter cloth, closes the outer tank water nozzle valve at the position, opens the inner tank water nozzle valve, simultaneously closes the outer tank cover plate corresponding to the water nozzle at the position, opens the inner tank cover plate corresponding to the inner tank water nozzle, and each cover plate is 1m long, and each two cover plates are divided into an upper layer and a lower layer, so that the filter press is manual and automatic, and a sliding plate or a corresponding group of cover plate button boxes can be manually pulled to automatically operate. In the checking section, unqualified pressure filtrate flows back to the regulating tank through an outer tank return pipe and an inner tank filter pressing black liquid through an inner tank converging pipe.
(4) Emergency section:
after the investigation procedure, the black liquor from the filter cloth of the filter press is returned to the regulating tank from the inner tank, the other filter cloth is discharged to the outer tank in emergency, after the turbidity meter of the outer tank is recovered to the normal value, the return valve of the outer tank is closed, the discharge valve of the outer tank is automatically opened, and the outer tank is discharged to the middle tank normally.
(5) And (3) maintaining: external groove and external discharge of new filter cloth
And a maintenance program section, wherein the filter cloth with the leakage point is replaced by a new filter cloth, before replacement, the tempering feed pump is stopped, and the water nozzle valve of the new filter cloth is switched to an outer groove opening and an inner groove closing. At this stage, the double-groove cover plate is fully opened, and the bottom mud accumulation condition is observed when the water in the double grooves is completely flowed.
(6) Flushing:
the flushing section comprises three procedures of flushing I, flushing II and flushing III, wherein the flushing I procedure is carried out after the normal operation section (2):
the normal operation cycle of the filter press comprises the whole set of processes of conditioning, feeding, pressure maintaining, squeezing, back blowing, pressure relief and mud unloading, the filter press normally operates for 2-3 cycles, after the mud unloading is finished, a flushing I program is started, a high-pressure flushing plunger water pump is started, and the filter plates and the filter cloth are automatically cleaned one by one according to a limit switch arranged on one side of each filter plate. And (3) flushing the program section I, fully opening the inner groove cover plate and fully closing the outer groove cover plate. The flushing splash liquid flows back to the regulating tank from the inner tank, and the flushing discharge liquid is discharged into the regulating tank from the flap liquid outlet pipeline.
Flushing II procedure after the repair section (5):
after the filter cloth with individual problems is replaced, draining the double grooves, observing the bottoms of the inner groove and the outer groove, and starting a flushing II procedure if more accumulated mud exists. The inner tank cover plate normally operates as a full closure, a small amount of black liquid or mud blocks which are inevitably splashed by filter cloth are intercepted on the cover plate in the filter pressing process, each group of cover plates can be washed one by one in the washing II stage, and washing liquid flows into the inner tank and flows back to the regulating tank. And simultaneously, flushing the bottom of the double grooves with tap water, closing the discharge valve of the outer groove, opening the reflux valve, and discharging flushing liquid to the regulating tank. After the flushing is finished, the sewage enters the operation section, and the lifting pump and the tempering feeding pump of the regulating tank are opened again to perform normal filter pressing and mud and water discharging.
A maintenance section appears in one filter pressing period, the filter pressing period of flushing II procedure is accomplished, and a flushing I procedure can be started, so that high-efficiency silicon removal is ensured, and the service life of filter cloth is prolonged.
The procedure of flushing III is set by the filtering equipment of the blending section, and the flushing III is divided into a manual flushing mode and an automatic flushing mode. Manually flushing for 5-6 periods, manually observing pressure gauges of the filter tank before and after the system is operated, opening a top cover of the filter tank if the pressure difference between the two gauges reaches a limit value, removing a stainless steel filter element, manually opening 2-4 inner groove cover plates of the filter press, and placing the filter element into the opened inner groove for manual flushing; the automatic flushing program is operated for more than 6 periods, the flushing port and the discharging port valves of the filter tank are automatically opened according to time setting, and the flushed water is discharged into the converging pipe of the inner tank and then enters the regulating tank.
The 3 stages enable the flushing liquid discharge and the filter pressing double-groove structure to be combined ingeniously, and high-efficiency recovery of the silicon powder of the system can be ensured multiple times.
(7) Blending section
The lifting pump of the middle tank is started, the water quality parameter of the water outlet pipe of the middle tank is automatically monitored, the blending tank stirrer is started, the water content data of the sludge after filter pressing is calculated according to the formula (1), the corresponding water supplementing amount of RO is controlled, the RO water supplementing pipe valve is started, and cutting fluid blending is carried out. And (3) opening a blending tank lifting pump, controlling a valve behind the pump, opening a blending tank reflux valve, closing a rear filtering tank water inlet valve and a bypass valve, automatically controlling reflux for 1-2min, monitoring the water quality parameters of the water entering the blending tank, controlling the supplementing amount of new cutting fluid according to the calculation result of a formula (2), opening a new cutting fluid dosing pipeline, closing the blending tank reflux pipeline, opening the rear filtering tank water inlet valve, and finishing blending. The system control principle formula is as follows:
Wherein: q (Q) RO Represents RO water supplementing amount, and enters the blending tank 6,Q through the RO water supplementing pipe 19 CN Representing the water supplementing amount of the new cutting fluid, and enters the blending tank 6,Q through the new cutting fluid dosing pipe 20 CW Representing the flow of liquid into the dosing unit, K, detected by the intermediate tank flow meter 271 S Represents the sludge water loss coefficient of the double-groove filter pressing unit, P represents the water content of filter-pressed sludge of the double-groove filter pressing unit, and Q f Represents the flow of raw water of slice wastewater, C f Represents the concentration of suspended matters in raw water of slicing wastewater, C r Represents the concentration of suspended matters in the filtrate of the external tank pressure, and can be measured by a portable sludge concentration meter, K DU Represents the dilution coefficient of the new cutting fluid, the application value of the invention is 300-350, and the pH value is 1 Indicating the pH of the liquid entering the dosing unit, detected by the tundish pH meter 272, pH 2 Indicating the pH value of the blended liquid blended by the blending unit, and detecting by a blending tank effluent pH meter 3001, E 1 Indicating the conductivity of the liquid entering the dosing unit, detected by the mid-tank conductivity meter 273, E 2 Indicating the well-allocated allocation of allocation unitThe conductivity of the liquid is detected by a water conductivity meter 3002 of the blending tank, T b1 Indicating the turbidity of the filtrate at the external tank pressure, and detecting by an external tank turbidimeter 231, T b2 Indicating the turbidity of the prepared liquid prepared by the preparation unit, and detecting by a water turbidity meter 3003 of the preparation tank. Thus, the RO water make-up amount can be controlled according to the formula (1), and the Q can be controlled according to the formula (2) CN The replenishment amount of the fresh cutting fluid.
The flow and suspended matter concentration of the slice wastewater discharged into the regulating tank are obtained by raw water quality data, the suspended matter concentration of the intermediate tank is measured, the water content of filter-pressed sludge is obtained according to the performance parameters of the filter press, and the RO water supplementing amount can be controlled in real time according to the formula (1) by considering the water loss of the sludge. In addition, the water quality parameters of the effluent of the middle tank are respectively obtained by an online instrument and are respectively turbidity Tb1, conductivity E1, flow Qcw and pH1. According to the procedure of 1-2min at the initial stage of dosing, measuring the water quality parameters of the effluent of the blending tank, such as conductivity E2, turbidity Tb2 and pH2, K, by an online instrument DU The cutting is available according to the characteristics of the new cutting fluid used, whereby Q can be controlled according to equation (2) CN The replenishment amount of the fresh cutting fluid.
The blending program sets the back reflux of the pump, and the system can accurately control the adding amount of the supplementing liquid through the change of the water quality parameters before and after the blending tank.
(8) And (3) recycling:
and (3) starting a recycling pool lifting pump, opening an inlet valve and an outlet valve of the UV sterilizer, filtering recycled water through a recycling filter tank terminal, and entering a water point for a slicing workshop machine. The surplus reuse water at the water point is returned to the reuse pool, and the drainage water at the water point is discharged to the front end regulating pool for retreatment, so that a large cycle is completed. The system circulates for a certain time, and according to the conductivity value and the pH value of the intermediate tank, the system automatically opens a system discharge valve and discharges the wastewater into a later-stage wastewater station for treatment when the pH value exceeds the limit value. The recycling section adopts a UV sterilizer and a PP filter element for terminal filtration, and the filter element of the recycling tank has the filtration precision of 1 mu m. The water point for the machine is provided with surplus water reflux control, and the pipeline discharged into the recycling pool is provided with a back pressure valve, so that the water pressure stability of the water point can be ensured.
The concentration of SS in the regulating tank is 12000-30000mg/L, after being treated by a silicon resource recovery system, the SS in the middle tank can be reduced to 30-100 mg/L, and the silicon recovery rate is higher than 99.6%; the water resource recycling of the slice wastewater can reach more than 20 times, and the wastewater is near zero discharge.
A recycling method of slice wastewater comprises the following steps:
step 1, slice wastewater with silicon powder particles discharged by a machine table of a slice workshop is discharged into the regulating tank 1 through a water inlet pipeline 21, and a submersible stirrer is arranged in the regulating tank because the wastewater contains finer silicon powder particles, so that the particle deposition at the bottom of the tank is prevented. After the waste water is homogenized, the waste water is lifted to a conditioning tank by adopting a wear-resistant slurry pump. The wastewater from slicing is usually alkaline, and the silicon and alkali in the wastewater can generate heat and H 2 The reaction is as follows:
Si+2NaOH+H 2 O＝Na 2 SiO 3 +2H 2 ↑
if the alkaline wastewater is directly subjected to filter pressing, the filter plate of the filter press is deformed at high temperature, so that the filter pressing dewatering capacity is reduced; and safety accidents can be caused by the enrichment of H2 in the air, so pH tempering is needed before filter pressing. According to engineering debugging experience, the pH economic range with the optimal effect of filtering silicon by pressing is 5-6, and the most suitable pH modifier A is 10-15% citric acid. The frame type stirrer is arranged in the tempering tank, the pH meter is arranged on the side wall of the tank body in consideration of the variability of the liquid level and the operability of personnel, the test probe can be ensured to be below the liquid level, the length of the installation protective sleeve is reduced, and meanwhile, the operation of manually checking and cleaning the probe is convenient. The pH meter is associated with the start and stop of the addition of the modifying agent A, and the pH stability of the system is automatically controlled. Therefore, the sliced wastewater is pumped into the conditioning tank 2 by the regulating tank lifting pump 12 for pH regulation, the pH conditioning agent A is added by the adding pipe A17, the conditioning tank pH meter 201 is linked with the adding automatic valve 171, and the pH value in the tank is controlled to be not more than 6.5.
Step 2: according to two-point requirements of filter cloth characteristics, firstly, water permeability and water passing speed are required to be ensured, secondly, a certain mesh number is required to intercept fine particles, and in the initial stage of filter pressing, the fine silicon powder particles are not sufficiently completely intercepted, in order to improve the silicon removal efficiency, a turbidity modifier B is added in the initial filtering stage, a pipeline is added after a modifying feeding pump, the pipeline pressure is utilized for rapid mixing, and mixed liquid enters a filter press, so that a denser filter layer can be rapidly formed on the surface of the filter cloth. The turbidity modifier B is perlite which takes silicon aluminum oxide as a main component, has the particle size of 0.1-1mm and the porosity as high as 85 percent, can form an adsorption bridging filter screen with silicon-containing particles of wastewater, can intercept most particles with the particle size of less than 1 mu m, and effectively prevents filter pressing black liquor from generating. In order to improve the recovery rate of the silicon powder, the press filtrate in 3min after tempering flows out from the inner groove to the regulating tank, and when the time is up, the feeding pipe B is automatically closed, the inner groove water nozzle valve and the inner groove cover plate are closed, and the next procedure is carried out.
Step 3: and pumping the turbidity-conditioned slice wastewater into a membrane filter press 3 for primary filtration by using a conditioning feed pump 13, controlling the opening degree of a metering pump connected with a feeding pipe B18 according to the SS concentration of the influent water to control the feeding amount, opening inner groove water nozzle valves at two sides of the membrane filter press 3, discharging the pressurized filtrate from an inner groove liquid receiving pipe to an inner groove converging pipe 24, and returning to the regulating tank 1 through the inner groove converging pipe 24.
The waste water enters a normal filter pressing operation procedure, a tempering feed pump is a wear-resistant slurry pump, the waste water containing silica powder particles is pressed into a filter press, suspended matters such as particles are intercepted by filter cloth, and finally the waste water is discharged in a silica mud form; the clear liquid is discharged from the filter pressing outer tank, the turbidity meter of the outer tank monitors the water quality of the filter pressing outer tank, NTU is within 100, the discharge pipeline of the outer tank is opened, and the liquid is discharged to the middle tank. The general filter press operation period comprises tempering, feeding, pressure maintaining, pressure relief and mud unloading, and in order to further reduce the water content of the mud, the invention increases the procedures of squeezing and back blowing after pressure maintaining. The squeezing medium is high-pressure tap water, when the feeding is finished, the feeding valve is automatically closed, tap water is injected into the elastic membrane plate between the filter cloth and the filter plate, so that the filter cloth is expanded and deformed, the filter cake is further dehydrated due to squeezing, and water after the squeezing is finished flows back to the tap water storage system, and the water is circulated and operated in each period. After squeezing, the back-blowing valve is opened, compressed air is introduced, high-pressure air passes through the filter cake, and water such as capillary water, structural water and the like in the filter cake is further separated, so that the water content of the filter cake is reduced to the minimum. The back-blowing reflux liquid returns to the regulating tank through a reflux pipeline. In the filter pressing process, filter cloth dropping liquid is collected by the turning plate, is connected with the converging pipe of the inner groove and is discharged into the regulating tank. Finally, the mud is discharged, and the silicon mud resource recovery system completes a circulation process.
Step 4: after the filter pressing normally runs for 2-3 periods and mud is discharged, a tap water pipeline at a high-pressure cleaning port (310) is opened to clean filter cloth of the filter plate one by one, flushing splash liquid falls into the inner groove reflux regulating ponds at two sides, flushing liquid goes out of the regulating ponds through a turning plate, silicon powder loss is avoided to the greatest extent, and silicon removal efficiency of the system is ensured to be more than 99%.
Step 5: when the numerical value of the outer tank turbidity meter (231) is more than 100 in operation, the device enters an investigation, emergency and maintenance section, the problem filter cloth and liquid are discharged from the inner tank, normal filter cloth liquid flows back to the inner tank converging pipe from the outer tank, after abnormality is removed, the turbidity meter is restored to a normal value, and the discharge pipeline is automatically opened by the outer tank liquid. And after replacing the individual leakage filter cloth, executing a flushing procedure II, cleaning the double tank, and discharging cleaning drainage from the inner tank back to the regulating tank for reprocessing.
Step 6: the waste water after silicon removal enters an intermediate tank (4), and sequentially enters a pre-blending filter tank (5), a blending tank (6) and a post-blending filter tank (7) through lifting. The pH value, the conductivity value and the flow value of the outer tank turbidity meter (231) and the middle tank water outlet pipe (27) are monitored, and the cutting fluid loss can be accurately supplemented according to a blending section setting program and a computing mode. The specific program is as follows:
The flow Q discharged into the regulating tank can be known from the raw water quality data of the slice wastewater f And suspended matter concentration C f The suspended matter concentration of the intermediate water tank can be measured in real time by a portable sludge concentration meter r The water content P of the filter-pressed sludge is obtained according to the performance parameters of the filter press, and the water loss coefficient K of the sludge is considered s The amount of water lost can be obtained in real time according to formula (1). The invention adopts the secondary RO concentrated water recycled in the wastewater station as the supplementing water, Q RO Control associated with RO makeup pipe (19) system:
wherein: q (Q) RO Represents RO water supplementing amount, and enters the blending tank 6,Q through the RO water supplementing pipe 19 CN Representing the water supplementing amount of the new cutting fluid, and enters the blending tank 6,Q through the new cutting fluid dosing pipe 20 CW Representing the flow of liquid into the dosing unit, K, detected by the intermediate tank flow meter 271 S Represents the sludge water loss coefficient of the double-groove filter pressing unit, P represents the water content of filter-pressed sludge of the double-groove filter pressing unit, and Q f Represents the flow of raw water of slice wastewater, C f Represents the concentration of suspended matters in raw water of slicing wastewater, C r Represents the concentration of suspended matters in the filtrate of the external tank pressure, and can be measured by a portable sludge concentration meter, K DU Represents the dilution coefficient of the new cutting fluid, the application value of the invention is 300-350, and the pH value is 1 Indicating the pH of the liquid entering the dosing unit, detected by the tundish pH meter 272, pH 2 Indicating the pH value of the blended liquid blended by the blending unit, and detecting by a blending tank effluent pH meter 3001, E 1 Indicating the conductivity of the liquid entering the dosing unit, detected by the mid-tank conductivity meter 273, E 2 Indicating the conductivity of the prepared liquid prepared by the preparation unit, and detecting by a water conductivity meter 3002 of the preparation tank, T b1 Indicating the turbidity of the filtrate at the external tank pressure, and detecting by an external tank turbidimeter 231, T b2 Indicating the turbidity of the prepared liquid prepared by the preparation unit, and detecting by a water turbidity meter 3003 of the preparation tank. Thus, the RO water make-up amount can be controlled according to the formula (1), and the Q can be controlled according to the formula (2) CN The replenishment amount of the fresh cutting fluid.
And (3) obtaining the water consumption in real time according to the formula (1), and adopting the secondary RO concentrated water recycled in the wastewater station as the supplementing water, so that the water is saved and the consumption is reduced. Q (Q) RO Control associated with RO makeup pipe 19 system, control Q according to equation (2) CN The replenishment amount of the new cutting fluid is controlled by opening the blending tank lift pump 15, controlling the post-pump valve, opening the blending tank return valve 3004, closing the post-canister inlet valve 3005 and the blending tank bypass valve 3006, controlling the replenishment amount of the new cutting fluid, opening the new cutting fluid dosing tube 20, simultaneously closing the blending tank return line, opening the post-canister inlet valve, and completing the blending to obtain the blending fluid.
The front and back filter tanks adopted in the blending process are stainless steel filter cores, the pressure resistance is 6 kg, the pressure gauge values in front of and behind the filter tanks differ by 1bar, the filter tanks can be washed, the filter tanks can be repeatedly washed manually or automatically, the filter precision is respectively 10 mu m and 3 mu m, a small amount of silicon powder particle systems brought by washing can also return to an inner tank converging pipe, and then return to a regulating tank, so that the outflow of the system is avoided.
Step 7: and (5) discharging the wastewater into a recycling pool for standby after two-stage filtration and blending. The prepared and filtered wastewater has the condition of recycling cutting fluid, bacteria are difficult to grow in the circulating process of the system, the pollution of bacteria and microorganisms is eliminated through an ultraviolet sterilizer, the sanitary condition of the recycled water is ensured, and meanwhile, after sterilization, a terminal precise filtration is added, the precision is 1 mu m, and the qualification of the indexes of recycled water suspended matters is ensured. And pumping the recycling water into a UV sterilizer through a recycling pool lifting pump, and recycling the water to the water point of the machine after flowing through a recycling filtering tank. In order to ensure that each water point of the machine station keeps certain water pressure, surplus water which is not used up in a workshop flows back to a recycling pipe of the recycling pool, a back pressure valve is arranged, and waste water generated after the machine station is used is discharged into a front-stage water inlet pipeline of the system, so that a large cycle is completed, and near zero discharge of the waste water is realized. The system circulates for more than 20 cycles, the conductivity value and the pH value of the intermediate tank are monitored, the conductivity value exceeds 300 or the pH exceeds the limit value of 6.5, a system discharge valve is automatically opened, and the wastewater is discharged into a later-stage wastewater station for treatment.
Waste water treatment engineering for slicing certain project of Baotou, design treatment capacity 4800m 3 And/d, the pH value of the inlet water is 7-9, the content of the silicon powder is 2.5-3%, the main component of the dosing agent B is perlite with the particle size of 0.1-1.0 mm, the permeability is strong, the porosity is as high as 85%, and the retention rate of fine particles with the particle size of 1-3 mu m is 90%. The filter cloth adopted in the project is of an N type, has the mesh number of 1200, forms a filter layer with adsorption bridging effect on the surface of the filter cloth in a short time after the filter cloth is combined with the dosing agent for primary filtration for 3min, can filter most particles below 1 mu m, prevents fine silicon powder from penetrating the filter cloth, and effectively prevents the generation of filter pressing black liquid. The project adopts a wear-resistant slurry pump for the pump of the silicon recovery system, the UHMWPE is used as the pump of the water recycling system, and the centrifugal pump of the overflow stainless steel 304 is used as the pump of the water recycling system; ultraviolet sterilization adopts 254nm wavelength.
The device operates normally for two months, the turbidity of the discharged water is stabilized at 60-80, an abnormal alarm is given during the period, the turbidity exceeds 100, and the device is operated according to an investigation program to replace one filter cloth, so that the filter-press black liquid is eliminated. The normal flushing procedure I is operated once every 2 filter pressing cycles, the accumulated mud on the cover plate of the inner tank is regularly flushed, and the bottom sediment silicon powder of the inner tank and the outer tank is flushed and cleaned, so that the loss of silicon resources is reduced to the greatest extent.
The SS of the slice wastewater filter tank is stabilized below 100mg/L after the slice wastewater is treated by the system, the recovery rate of silicon powder reaches more than 99.6%, the cleaning frequency of the system filter cloth is less, and the operation is simple; the slice recycling system circularly operates for 25 times to discharge primary wastewater to the wastewater station, and the ratio of the operation water supplementing quantity to the wastewater quantity is basically controlled at 1:400, the first two stages of stainless steel filter cores are self-cleaned 5 times per month, manually cleaned 1 time, and the terminal pp filter cores are washed once per half month and replaced once per month. The whole wastewater recycling system has high self-control degree, high recovery rate and stable system operation effect, and the recycled water quality reaches the standard.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (9)
1. A slice waste water resourceful treatment retrieval and utilization device which characterized in that: the device comprises a silicon resource recovery system and a water resource recycling system, wherein the silicon resource recovery system comprises a slice wastewater adjusting unit, a slice wastewater conditioning unit and a double-groove filter pressing unit, wherein:
The slice wastewater adjusting unit is used for stirring raw slice wastewater, reuse water and internal groove filter pressing liquid to obtain stirred slice wastewater;
the slice wastewater conditioning unit is used for firstly carrying out pH adjustment on the stirred slice wastewater to obtain the slice wastewater with the pH adjusted; then carrying out turbidity tempering on the slice wastewater subjected to pH adjustment to obtain slice wastewater subjected to turbidity tempering;
the double-groove filter pressing unit is used for carrying out filter pressing on the slice wastewater subjected to turbidity tempering, and particle suspended matters in the slice wastewater subjected to turbidity tempering are intercepted by filter cloth to obtain silicon mud, inner groove filter pressing liquid and outer groove filter pressing liquid; the silicon mud is discharged into a silicon mud bin, the filter pressing liquid in the inner groove returns to the slice wastewater adjusting unit, and the filter pressing liquid in the outer groove enters a water resource recycling system;
the water resource recycling system comprises a blending unit and a recycling unit, wherein:
the blending unit is used for performing RO water supplementing on the external tank pressure filtrate and blending new cutting fluid to obtain blended fluid, and the RO water supplementing adopts secondary RO concentrated water recycled in a wastewater station as supplementing water;
the allocation formula of the allocation unit comprises the following steps:
wherein: />Indicating RO water supply, < >>Indicating the water supplementing amount of the new cutting fluid>Indicating the flow of liquid into the dosing unit, +. >Represents the sludge water loss coefficient of the double-tank filter pressing unit, < ->Represents the water content of filter-pressed sludge of the double-groove filter-pressing unit, < >>Represents the flow of raw water of slice wastewater, and is->Represents the concentration of crude water suspension of slicing wastewater, < >>Represents the concentration of the external tank pressure filtrate suspension, +.>Represents the dilution factor of the new cutting fluid, +.>Indicating the pH value of the liquid entering the dosing unit, < >>Indicating the pH value of the prepared liquid prepared by the preparation unit,indicating the conductivity of the liquid entering the dosing unit, +.>Indicating the conductivity of the prepared liquid prepared by the preparation unit, < >>Indicating the turbidity of the filtrate at the external tank pressure,/->Indicating the turbidity of the prepared liquid prepared by the preparation unit;
the recycling unit is used for recycling the wastewater of the prepared mixed solution to obtain recycled water.
2. The apparatus for recycling and treating sliced waste water according to claim 1, wherein: the double-groove filter pressing unit comprises a back-blowing module, wherein the back-blowing module is used for introducing compressed air, high-pressure air passes through a filter cake, water in the filter cake is further separated to obtain back-blowing reflux liquid, and the back-blowing reflux liquid flows back to the slice wastewater regulating unit; the slice wastewater adjusting unit is used for stirring slice wastewater raw water, UV disinfection blending liquid, inner tank pressure filtrate and back-blowing reflux liquid to obtain stirred slice wastewater.
3. The apparatus for recycling and treating sliced waste water according to claim 2, wherein: the double-groove filter pressing unit comprises a pressing module, wherein the pressing module is used for injecting high-pressure tap water serving as a pressing medium into an elastic membrane plate between filter cloth and a filter plate when feeding is finished, so that the filter cloth is expanded and deformed, the filter cake is further dehydrated due to pressing, and water after the pressing is finished flows back to a tap water storage system.
4. The apparatus for recycling and treating sliced waste water according to claim 3, wherein: slice waste water regulating unit includes equalizing basin (1), slice waste water quenching and tempering unit includes quenching and tempering jar (2), double flute filter-pressing unit includes diaphragm filter press (3), wherein:
the regulating tank (1) is provided with a water inlet pipeline (21), the regulating tank (1) is communicated with the tempering tank (2) through a tempering tank water inlet pipe (121), and the tempering tank water inlet pipe (121) is provided with a regulating tank lifting pump (12);
a feeding pipe A (17) is arranged on the tempering tank (2), and a feeding automatic valve (171) is arranged on the feeding pipe A (17); a tempering tank pH meter (201) is arranged in the tempering tank (2); the tempering tank (2) is communicated with a feed return opening (301) of the membrane filter press (3) through a tempering feed pipe (22); the tempering feed pipe (22) is sequentially provided with a tempering feed pump (13) and a first valve along the water flow direction; a tempering feed pipe (22) between the tempering feed pump (13) and the first valve is communicated with one end of a back-blowing feed back pipe (221), and the other end of the back-blowing feed back pipe (221) is communicated with the regulating tank (1);
The membrane filter press (3) is communicated with the regulating tank (1) through an inner tank converging pipe (24), the membrane filter press (3) is communicated with the middle tank (4) through an outer tank discharging pipe (25), and an outer tank turbidity meter (231) and an outer tank discharging valve (251) are arranged on the outer tank discharging pipe (25); one end of an outer groove reflux pipe (26) is connected to an outer groove discharge pipe (25) between the outer groove turbidity meter (231) and the outer groove discharge valve (251), the other end of the outer groove reflux pipe (26) is communicated with an inner groove converging pipe (24), and an outer groove reflux valve (261) is arranged on the outer groove reflux pipe (26).
5. The apparatus for recycling and treating sliced waste water according to claim 4, wherein: the water treatment device comprises a middle tank (4), wherein a middle tank water outlet pipe (27) is arranged on the middle tank (4), a middle tank lifting pump (14) is arranged at one end, close to the middle tank (4), of the middle tank water outlet pipe (27), and a middle tank flowmeter (271), a middle tank pH meter (272) and a middle Chi Diandao meter (273) are arranged at one end, far away from the middle tank (4), of the middle tank water outlet pipe (27); the water outlet end of the middle tank water outlet pipe (27) is connected with a system discharge pipe (281), and a system discharge valve (2811) is arranged on the system discharge pipe (281).
6. The apparatus for recycling and treating sliced waste water according to claim 5, wherein: the recycling unit comprises a recycling pool (8), a UV sterilizer (9), a recycling filter tank (10) and a machine water point (11);
the front-blending filter tank (5) is provided with a front-blending filter tank water inlet pipe (28), a front-blending filter tank flushing port (51) and a front-blending filter tank discharge port (52), and the front-blending filter tank water inlet pipe (28) is communicated with the water outlet end of the middle tank water outlet pipe (27); the front canister drain (52) communicates with a flush drain (241), the flush drain (241) communicating with an inner tank junction (24);
the mixing tank (6) is provided with an RO water supplementing pipe (19), a new cutting fluid feeding pipe (20), a mixing tank water inlet pipe (29) and a mixing tank water outlet pipe (30), and the mixing tank water inlet pipe (29) is communicated with a discharge port of the filtering tank (5) before mixing; a blending tank lifting pump (15) is arranged at one end, close to the blending tank (6), of the blending tank water outlet pipe (30), a blending tank water outlet pH meter (3001), a blending tank water outlet conductivity meter (3002) and a blending tank water outlet turbidity meter (3003) are arranged at one end, far away from the blending tank (6), of the blending tank water outlet pipe (30), a blending tank bypass pipe is arranged on the blending tank water outlet pipe (30), and a blending tank bypass valve (3006) is arranged on the blending tank bypass pipe; a blending tank reflux pipe is arranged on the blending tank water outlet pipe (30), a blending tank reflux valve (3004) is arranged on the blending tank reflux pipe, and a water outlet of the blending tank reflux pipe is communicated with the blending tank (6);
The blending rear filter tank (7) is provided with a rear filter tank inlet, a rear filter tank flushing port (71), a rear filter tank discharge port (72) and a rear filter tank discharge port, the rear filter tank inlet is communicated with a blending tank water outlet pipe (30), the rear filter tank inlet is provided with a rear filter tank water inlet valve (3005), and the rear filter tank discharge port (72) is communicated with a flushing discharge pipe (241);
the recycling tank (8) is provided with a recycling tank water inlet pipe (31), a recycling tank water outlet pipe (32) and a water consumption point return pipe (35), the recycling tank water inlet pipe (31) is communicated with a rear filter tank discharge hole of the blended rear filter tank (7), the water consumption point return pipe (35) is communicated with a machine water consumption point (11), and a return pipe back pressure valve (351) is arranged on the water consumption point return pipe (35); a recycling pool lifting pump (16) is arranged at one end of the recycling pool water outlet pipe (32) close to the recycling pool (8);
the UV sterilizer (9) is provided with a sterilizer liquid inlet pipe and a sterilizer liquid outlet pipe, the sterilizer liquid inlet pipe is communicated with a recycling pool water outlet pipe (32), the sterilizer liquid inlet pipe is provided with a sterilizer liquid inlet valve, and the sterilizer liquid outlet pipe is provided with a sterilizer liquid outlet valve;
The recycling filter tank (10) is provided with a recycling filter tank water inlet pipe (33) and a recycling filter tank water outlet pipe, and the recycling filter tank water inlet pipe (33) is respectively communicated with a sterilizer liquid outlet pipe and a recycling pool water outlet pipe (32);
the water point for the machine is provided with a water point water inlet pipe (34), a water point reflux port and a water inlet pipe orifice, the water point water inlet pipe (34) is communicated with a water outlet pipe of a recycling filter tank of the recycling filter tank (10), the water point reflux port is communicated with a water point reflux pipe (35), and the water inlet pipe orifice is communicated with a water inlet pipeline (21).
7. The apparatus for recycling and treating sliced waste water according to claim 6, wherein: the membrane filter press (3) comprises a left side pressure filter structure and a right side pressure filter structure, the left side pressure filter structure comprises a left side outer tank water nozzle valve (3041), a left side inner tank water nozzle valve (3051), a left side outer tank (3061), a left side inner tank (3071), a left side outer tank liquid receiving pipe (3081) and a left side inner tank liquid receiving pipe (3091), the left side outer tank water nozzle valve (3041) is connected with the left side outer tank (3061), the left side inner tank water nozzle valve (3051) is connected with the left side inner tank (3071), the left side outer tank liquid receiving pipe (3081) is arranged on the left side outer tank (3061), and the left side inner tank liquid receiving pipe (3091) is arranged on the left side inner tank (3071); the left side outer groove liquid receiving pipe (3081) is communicated with the outer groove converging pipe (23), the outer groove converging pipe (23) is communicated with the outer groove discharging pipe (25), and the left side inner groove liquid receiving pipe (3091) is communicated with the inner groove converging pipe (24); the right side pressure filtering structure comprises a right side outer tank water nozzle valve (3042), a right side inner tank water nozzle valve (3052), a right side outer tank (3062), a right side inner tank (3072), a right side outer tank liquid receiving pipe (3082) and a right side inner tank liquid receiving pipe (3092), wherein the right side outer tank water nozzle valve (3042) is connected with the right side outer tank (3062), the right side inner tank water nozzle valve (3052) is connected with the right side inner tank (3072), the right side outer tank liquid receiving pipe (3082) is arranged on the right side outer tank (3062), and the right side inner tank liquid receiving pipe (3092) is arranged on the right side inner tank (3072); the right outer tank liquid receiving pipe (3082) is communicated with the outer tank converging pipe (23), the outer tank converging pipe (23) is communicated with the outer tank discharging pipe (25), and the right inner tank liquid receiving pipe (3092) is communicated with the inner tank converging pipe (24).
8. A recycling method based on the slice wastewater recycling treatment recycling device of claim 7, which is characterized by comprising the following steps:
step 1, slice wastewater with silicon powder particles is discharged into an adjusting tank (1) through a water inlet pipeline (21), a stirrer is arranged in the tank, the slice wastewater is stirred through the stirrer, then the slice wastewater is pumped into a tempering tank (2) through an adjusting tank lifting pump (12) to carry out pH adjustment, a pH tempering agent A is added through an adding pipe A (17), a tempering tank pH meter (201) is linked with an adding automatic valve (171), and the pH value in the tank is controlled to be not more than 6.5; adding a turbidity modifier B into the slice wastewater through an adding pipe B (18), and performing turbidity modification on the slice wastewater subjected to pH adjustment to obtain turbidity modified slice wastewater;
step 2, pumping the turbidity-conditioned slice wastewater into a membrane filter press (3) for primary filtration by using a conditioning feed pump (13), controlling the opening degree of a metering pump connected with a feeding pipe B (18) according to the concentration of inlet SS to control the feeding amount, opening inner groove water nozzle valves at two sides of the membrane filter press (3), discharging the pressure filtrate from an inner groove liquid receiving pipe to an inner groove converging pipe (24), and returning the pressure filtrate to a regulating tank (1) through the inner groove converging pipe (24);
Step 3, the quenched and tempered slice wastewater enters a feed inlet of a filter press through a quenching and tempering feed pump (13), filter plates are closely aligned under the action of pressure to form a filter chamber between the filter plates, the wastewater is pressed into the filter chamber, solid particles and suspended matters are partially trapped by filter cloth to form a filter cake, and a liquid part is discharged out of the filter chamber through filter pressing liquid; the squeezing opening (302) is connected with a tap water system, and after further squeezing the water content of the filter cake, the squeezed water is recycled and discharged into the tap water system; the back-blowing port (311) is connected with compressed air to further blow and dehydrate the filter cake, and back-blowing liquid is discharged into the regulating tank (1) through the feeding and back-feeding port (301); after dehydration is completed, the compression force of the filter plates is relieved, the filter plates are automatically pulled one by one, and the filter chambers are respectively opened for discharging mud;
step 4, the filter pressing liquid after silicon removal enters an intermediate tank (4), and sequentially enters a pre-blending filter tank (5), a blending tank (6) and a post-blending filter tank (7); the cutting fluid loss is supplemented by monitoring the pH value, the conductivity and the flow value of the outer tank turbidity meter (231) and the middle tank water outlet pipe (27):
formula (1)
Formula (2)
Wherein:indicating RO water supply, < >>Indicating the water supplementing amount of the new cutting fluid>Indicating the flow of liquid into the dosing unit, +. >Represents the sludge water loss coefficient of the double-tank filter pressing unit, < ->Represents the water content of filter-pressed sludge of the double-groove filter-pressing unit, < >>Represents the flow of raw water of slice wastewater, and is->Represents the concentration of crude water suspension of slicing wastewater, < >>Represents the concentration of the external tank pressure filtrate suspension, +.>Represents the dilution factor of the new cutting fluid, +.>Indicating the pH value of the liquid entering the dosing unit, < >>Indicating the pH value of the prepared liquid prepared by the preparation unit, </u >>Indicating the conductivity of the liquid entering the dosing unit, +.>Indicating the conductivity of the prepared liquid prepared by the preparation unit, < >>Indicating the turbidity of the filtrate at the external tank pressure,/->Indicating the turbidity of the prepared liquid prepared by the preparation unit;
obtaining RO water supplementing quantity in real time according to a formula (1), and adopting secondary RO concentrated water recycled in a wastewater station as supplementing water, wherein RO water supplementing quantity Q RO Control associated with RO make-up pipe (19) system, control make-up quantity Q of new cutting fluid according to formula (2) CN Opening a blending tank lifting pump (15), controlling a back valve of the pump, opening a back valve of the blending tank (3004), closing a back filter tank water inlet valve (3005) and a blending tank bypass valve (3006), controlling the supplementing amount of new cutting fluid, opening a new cutting fluid dosing pipe (20), closing a back valve of the blending tank, opening a back filter tank water inlet valve, and finishing blending to obtain blending fluid;
And 5, filtering the blended liquid by a filtering tank (7) after blending, discharging the filtered blended liquid into a recycling pool (8) for standby, pumping the recycling water into a UV sterilizer (9) by a recycling pool lifting pump (16), and recycling the recycled water to a water point (11) for a machine after flowing through a recycling filtering tank (10).
9. The recycling method according to claim 8, characterized in that: the pH modifier A is 10-15% of citric acid; the turbidity modifier B comprises a solution of silicon aluminum oxide.
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| CN108793554A (en) * | 2018-06-12 | 2018-11-13 | 山东大海新能源发展有限公司 | A kind of silicon chip cutting fluid circulatory system and method using diamond wire |
| CN210103636U (en) * | 2019-06-06 | 2020-02-21 | 江苏道同环境科技有限公司 | Silicon-containing wastewater recovery device |
| CN216737850U (en) * | 2021-12-17 | 2022-06-14 | 江苏道同环境科技有限公司 | Slice wastewater resourceful treatment retrieval and utilization device |
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| CN108793554A (en) * | 2018-06-12 | 2018-11-13 | 山东大海新能源发展有限公司 | A kind of silicon chip cutting fluid circulatory system and method using diamond wire |
| CN210103636U (en) * | 2019-06-06 | 2020-02-21 | 江苏道同环境科技有限公司 | Silicon-containing wastewater recovery device |
| CN216737850U (en) * | 2021-12-17 | 2022-06-14 | 江苏道同环境科技有限公司 | Slice wastewater resourceful treatment retrieval and utilization device |
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