CN114212927A

CN114212927A - Device and method for recycling slice wastewater

Info

Publication number: CN114212927A
Application number: CN202111551801.3A
Authority: CN
Inventors: 袁香; 戴美新; 张隽; 魏洋; 张子种; 徐建功
Original assignee: Jiangsu Daotong Environmental Technology Co ltd
Current assignee: Jiangsu Daotong Environmental Technology Co ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-03-22
Anticipated expiration: 2041-12-17
Also published as: CN114212927B

Abstract

The invention discloses a slicing wastewater resource treatment recycling device and a method, and the device comprises a silicon resource recycling system and a water resource recycling system, wherein the silicon resource recycling system comprises a slicing wastewater adjusting unit, a slicing wastewater tempering unit and a double-groove filter pressing unit, the double-groove filter pressing unit is used for carrying out filter pressing on the slicing wastewater subjected to turbidity tempering, and particle suspended matters in the slicing wastewater subjected to turbidity tempering are intercepted by filter cloth to obtain silicon mud, inner groove pressure filtrate and outer groove pressure filtrate; the water resource recycling system comprises a blending unit and a recycling unit, wherein the blending unit is used for performing RO water supplementation and new cutting fluid blending on the outer tank filter pressing liquid to obtain blending liquid; the method has the advantages of high reaction speed, capability of preventing and removing the filter pressing black liquid, high silicon powder recovery efficiency, accurate control of the liquid supplementing amount by a recycling system and capability of meeting the recycling requirement of the slices.

Description

Device and method for recycling slice wastewater

Technical Field

The invention relates to a monocrystalline silicon slice wastewater resourceful treatment and recycling device and method, and belongs to the field of water pollution prevention and resource recycling.

Background

The monocrystalline silicon slice is an important link of photovoltaic cell production, the process adopts the mainstream diamond wire cutting process in recent years, the diameter of a cutting wire is thinner, the discharged silicon powder particles are also thinner, 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 online cutting reaction process, the used water-based linear cutting fluid has the effects of lubricating, cooling and discharging silicon slag, and meanwhile, metal particles, silicon chips and water can be brought into the cutting fluid, so that a slicing wastewater discharge machine table is formed.

Pollutants in the slicing wastewater are mainly suspended matters, organic matters, chromaticity, acid and alkali and the like. The conventional process idea of slicing wastewater is to remove silicon, silicon particles in the wastewater are separated by a dosing coagulation sedimentation method or a filter pressing method so as to achieve the purpose of recovering silicon, and the wastewater after silicon removal is discharged into the comprehensive production wastewater for treatment and then discharged.

The traditional coagulating sedimentation silicon removal method has the problems that: the silicon powder has higher density, the silicon powder after the diamond wire cutting is very thin, the specific surface area is increased, the precipitation is not easy to occur, and the silicon removal efficiency is low; the unremoved silicon powder flows into a subsequent comprehensive wastewater unit, and the back-end biochemical process is easy to block; after the coagulation and precipitation by adding the medicine, the recycling value of the silicon powder is reduced.

The problems of the conventional filter-pressing silicon removal method are as follows: the effluent water at the initial stage of filter pressing can bring out a lot of silicon powder, namely the filter pressing black liquor, through backflow retreatment, the effluent water at the later stage can be slowly cleared, but a filtrate backflow pump is added, and the operation cost is high; the filter aid is added at the front stage of filter pressing, the method cannot accurately control the dosage, on the contrary, the dosage is too much, so that the filter cloth is blocked, the water outlet is too slow, the filter cloth cleaning frequency is increased, and the treatment efficiency is reduced; in addition, in the filter pressing process, the black liquid is difficult to avoid and reappear due to splashing, dropping and leakage caused by improper operation of personnel or leakage caused by damage of a plate frame filter cloth, the black liquid enters a liquid filter tank when the black liquid is discovered, removed and maintained in time, the silicon powder resource is lost, and the difficulty in post-stage treatment is increased; and the step-by-step shutdown or maintenance can increase more labor cost, seriously cause shutdown and cause greater economic loss.

Along with the increasing urgency of the requirement of wastewater resource treatment, the recycling of the cutting fluid discharged into the later stage for comprehensive treatment is also gradually paid attention. However, the existing recycling technology of cutting fluid basically stays at the stage of simple filtration and rough fluid replacement, so that silicon powder in the cutting fluid is not completely removed, and the newly replaced cutting fluid is too much or too little, so that the cutting fluid of a recycling production line cannot meet the requirement, and the efficiency of silicon slicing is reduced.

At present, the main problems in the slicing wastewater treatment and recycling technology are as follows: the silicon removal efficiency of the dosing method is low, the silicon powder recovery quality is not high, the filter-pressing black liquid frequently appears, the effluent index of the filtrate is unstable, the post-stage wastewater treatment load is high, and the operation cost is high; the recovery and recycling process of the cutting fluid is complex to operate, effective control parameters and methods are lacked, the circulating fluid does not reach the standard, the production efficiency is low, and the like.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a device and a method for recycling and treating slice wastewater.

The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a recycling device is handled to section waste water resourceful, includes silicon resource recovery system and water resource recycling system, silicon resource recovery system includes section waste water regulating unit, section waste water quenching and tempering unit and double flute filter pressing unit, wherein:

the slicing wastewater adjusting unit is used for stirring slicing wastewater raw water, UV disinfection blending liquid and outer tank filter pressing liquid to obtain stirred slicing wastewater.

The slicing wastewater conditioning unit is used for firstly carrying out pH adjustment on the stirred slicing wastewater to obtain the slicing wastewater after pH adjustment. And then carrying out turbidity tempering on the slicing wastewater after pH adjustment to obtain the slicing wastewater after turbidity tempering.

The double-groove filter pressing unit is used for carrying out filter pressing on the turbidity-conditioned slicing wastewater, and particle suspended matters in the turbidity-conditioned slicing wastewater are intercepted by the filter cloth to obtain silicon mud, inner groove pressure filtrate and outer groove pressure filtrate. And the silicon mud is discharged into the silicon mud bin, the internal groove pressure filtrate returns to the slice wastewater adjusting unit, and the external groove pressure filtrate enters the water resource recycling system.

The water resource recycling system comprises a blending unit and a recycling unit, wherein:

and the blending unit is used for performing RO water supplement on the outer tank filter pressing liquid and blending the new cutting liquid to obtain blended liquid.

And the recycling unit is used for carrying out UV disinfection on the obtained blending liquid to obtain UV disinfection blending liquid.

Preferably: the double-groove filter pressing unit comprises a back blowing module, the back blowing module is used for introducing compressed air, the high-pressure air passes through the filter cake, the moisture 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 slicing wastewater adjusting unit is used for stirring slicing wastewater raw water, UV disinfection blending liquid, outer tank filter pressing liquid and back flushing backflow liquid to obtain stirred slicing wastewater.

Preferably: the double-groove filter pressing unit comprises a pressing module, the pressing module is used for injecting high-pressure tap water serving as a pressing medium into an elastic diaphragm plate between the filter cloth and the 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 flows back to a tap water storage system after pressing is finished.

Preferably: the blending formula of the blending unit is as follows:

wherein: q_RORepresents RO water supply amount, Q_CNIndicating new cutting fluidAmount of water supplement, Q_CWIndicating the flow of liquid into the dosing unit, K_SThe water loss coefficient of the sludge of the double-tank filter pressing unit is shown, P represents the water content of the filter pressing sludge of the double-tank filter pressing unit, and Q_fIndicates the flow rate of raw water of the slicing wastewater, C_fShowing the concentration of suspended matter in the raw water of the slice wastewater, C_rRepresents the suspended matter concentration of the outer tank pressure filtrate, K_DUIndicates the dilution factor, pH, of the novel cutting fluid₁Indicating the pH of the liquid entering the formulation unit, pH₂Indicates the pH value of the prepared liquid prepared by the preparation unit, E₁Indicating the conductivity of the liquid entering the formulation unit, E₂Indicates the conductivity, T, of the prepared liquid of the preparation unit_b1Denotes the external tank pressure filtrate turbidity, T_b2The turbidity of the prepared solution prepared by the preparation unit is shown.

Preferably: the section waste water regulating unit includes the equalizing basin, section waste water quenching and tempering unit includes the quenching and tempering jar, double flute filter pressing unit includes the membrane pressure filter, wherein:

the conditioning tank is characterized in that a water inlet pipeline is arranged on the conditioning tank, the conditioning tank is communicated with the conditioning tank through a conditioning tank water inlet pipe, and a conditioning tank lift pump is arranged on the conditioning tank water inlet pipe.

And the tempering tank is provided with an adding pipe A, and the adding pipe A is provided with an adding automatic valve. And a pH meter of the tempering tank is arranged in the tempering tank. And the tempering tank is communicated with a feeding feed back hole of the membrane filter press through a tempering feed pipe. The quenching and tempering feed pipe is sequentially provided with a quenching and tempering feed pump and a first valve along the water flow direction. And the tempering feeding pipe between the tempering feeding pump and the first valve is communicated with one end of the back-blowing material return pipe, and the other end of the back-blowing material return 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 discharge pipe, and an outer groove turbidimeter and an outer groove discharge valve are arranged on the outer groove discharge pipe. The one end of outer tub back flow is connected on the outer tub delivery pipe between outer tub turbidimeter and the outer tub discharge valve, and the other end and the inside groove of outer tub back flow join the pipe intercommunication, be provided with the outer tub backward flow valve on the outer tub back flow.

Preferably: including middle pond, be provided with middle pond outlet pipe on the middle pond, the one end that middle pond outlet pipe is close to middle pond is provided with middle pond elevator pump, the one end that middle pond was kept away from to middle pond outlet pipe is provided with middle pond flowmeter, middle pond pH meter, middle pond conductivity meter. And the water outlet end of the water outlet pipe of the intermediate 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 machine water consumption point.

The filter tank is provided with a filter tank water inlet pipe before allocation, a filter tank flushing port before allocation and a filter tank discharge port before allocation, and the filter tank water inlet pipe before allocation is communicated with the water outlet end of the water outlet pipe of the intermediate tank. The discharge port of the front filter tank is communicated with a flushing discharge pipe which is communicated with the inner groove converging pipe.

The blending tank is provided with an RO water replenishing pipe, a new cutting fluid feeding pipe, a blending tank water inlet pipe and a blending tank water outlet pipe, and the blending tank water inlet pipe is communicated with a discharge hole of the filter tank before blending. The water quality control system is characterized in that a blending tank lifting pump is arranged at one end, close to the blending tank, of a water outlet pipe of the blending tank, a blending tank water outlet pH meter, a blending tank water outlet conductivity meter and a blending tank water outlet turbidity meter are arranged at one end, far away from the blending tank, of the water outlet pipe of the blending tank, a blending tank side pipe is arranged on the water outlet pipe of the blending tank, and a blending tank bypass valve is arranged on the blending tank side pipe. A mixing tank return pipe is arranged on the mixing tank water outlet pipe, a mixing tank return valve is arranged on the mixing tank return pipe, and a water outlet of the mixing tank return pipe is communicated with the mixing tank.

The post-filtration tank inlet, the post-filtration tank flushing port, the post-filtration tank discharging port and the post-filtration tank discharging port are arranged on the blended post-filtration tank, the post-filtration tank inlet is communicated with a water outlet pipe of the blending tank, a post-filtration tank water inlet valve is arranged on the post-filtration tank inlet, and the post-filtration tank discharging port is communicated with a flushing discharging pipe.

The recycling tank is provided with a recycling tank water inlet pipe, a recycling tank water outlet pipe and a water consumption point return pipe, the recycling tank water inlet pipe is communicated with a rear filter tank discharge port of the blending rear filter tank, the water consumption point return pipe is communicated with a machine station water consumption point, and the water consumption point return pipe is provided with a return pipe back pressure valve. 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 characterized in that a sterilizer liquid inlet pipe and a sterilizer liquid outlet pipe are arranged on the UV sterilizer, the sterilizer liquid inlet pipe is communicated with a recycling pool water outlet pipe, a sterilizer liquid inlet valve is arranged on the sterilizer liquid inlet pipe, and a sterilizer liquid outlet valve is arranged on the sterilizer liquid outlet pipe.

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 board is provided with water spot inlet tube, water spot backward flow mouth and the mouth of pipe of intaking on with the water spot, filter jar outlet pipe intercommunication is crossed with the retrieval and utilization of retrieval and utilization filter jar to the water spot inlet tube, water spot backward flow mouth and water spot back flow intercommunication, the mouth of pipe of intaking and inlet channel intercommunication.

Preferably: the diaphragm filter press comprises a left side filter pressing structure and a right side filter pressing structure, wherein the left side filter pressing 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 outer groove liquid receiving pipe is communicated with the outer groove converging pipe, the outer groove converging pipe is communicated with the outer groove discharge pipe, and the left inner groove liquid receiving pipe is communicated with the inner groove converging pipe. The right side filter pressing structure includes that right side water injection well choke valve, right side inside groove water injection well choke valve, right side water injection well, right side inside groove, right side water injection well jacket connect the liquid pipe, right side inside groove connects the liquid pipe, right side water injection well choke valve inserts the right side inside groove, the right side water injection well jacket connects the liquid pipe to set up on the right side water injection well jacket, the right side inside groove connects the liquid pipe to set up on the right side inside 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 discharge pipe, and the right inner groove liquid receiving pipe is communicated with the inner groove converging pipe.

A recycling method of slice wastewater resource comprises the following steps:

step 1, discharging slicing wastewater with silicon powder particles into a regulating reservoir through a water inlet pipeline, arranging a stirrer in the reservoir, stirring the slicing wastewater through the stirrer, pumping the slicing wastewater into a tempering tank through a regulating reservoir lifting pump for pH regulation, adding a pH tempering agent A through an adding pipe A, linking a pH meter of the tempering tank with an automatic adding valve, and controlling the pH value in the tank to be not more than 6.5. And adding a turbidity modifying agent B through an adding pipe B, and carrying out turbidity modifying on the slicing wastewater after pH adjustment to obtain the slicing wastewater after turbidity modifying.

And 2, pumping the turbidity-conditioned slicing 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 influent SS (suspended solids) to control the feeding amount, opening water nozzle valves of inner grooves on two sides of the membrane filter press, discharging the pressure filtrate from the inner grooves to an inner groove converging pipe through an inner groove liquid receiving pipe, and returning the pressure filtrate to a regulating reservoir through the inner groove converging pipe.

And 3, feeding the conditioned slice wastewater into a feed inlet of a filter press through a conditioning feed pump, tightly arranging the filter plates into 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 intercepted by filter cloth to form a filter cake, and discharging the liquid part out of the filter chamber through filter pressing liquid. The squeezing port is connected with a tap water system, and after the water of the filter cake is further squeezed, the squeezing water is recycled and discharged into the tap water system. The back flushing port is connected with compressed air to further blow and dewater the filter cake, and back flushing liquid is discharged into the regulating reservoir through the return port. After dewatering, the pressing force of the filter plates is released, the filter plates are automatically pulled one by one, and the filter chambers are respectively opened for mud discharge.

And 4, allowing the pressure filtrate subjected to silicon removal to enter an intermediate tank, and sequentially entering a pre-blending filter tank, a blending tank and a post-blending filter tank. Supplementing the cutting fluid loss amount by monitoring the pH value, the conductivity value and the flow value of an outer tank turbidimeter and a water outlet pipe of a middle pool:

wherein: q_RORepresents RO water supply amount, Q_CNIndicates the amount of water supply of the new cutting fluid, Q_CWIndicating the flow of liquid into the dosing unit, K_SThe water loss coefficient of the sludge of the double-tank filter pressing unit is shown, P represents the water content of the filter pressing sludge of the double-tank filter pressing unit, and Q_fIndicates the flow rate of raw water of the slicing wastewater, C_fShowing the concentration of suspended matter in the raw water of the slice wastewater, C_rRepresents the suspended matter concentration of the outer tank pressure filtrate, K_DUIndicates the dilution factor, pH, of the novel cutting fluid₁Indicating the pH of the liquid entering the formulation unit, pH₂Indicates the pH value of the prepared liquid prepared by the preparation unit, E₁Indicating the conductivity of the liquid entering the formulation unit, E₂Indicates the conductivity, T, of the prepared liquid of the preparation unit_b1Denotes the external tank pressure filtrate turbidity, T_b2The turbidity of the prepared solution prepared by the preparation unit is shown.

Obtaining RO water supplement quantity (loss water quantity) in real time according to a formula (1), adopting secondary RO concentrated water recycled from the water in the wastewater station as make-up water, and obtaining RO water supplement quantity Q_ROControlling the supplement quantity Q of the new cutting fluid according to a formula (2) by being related to an RO water supplement pipe system_CNOpening a lift pump of the blending tank, controlling a rear valve of the pump, opening a reflux valve of the blending tank, closing a water inlet valve of the rear filter tank and a bypass valve of the blending tank, controlling the supplement amount of the new cutting fluid, opening a feeding pipe of the new cutting fluid, simultaneously closing a reflux pipeline of the blending tank, opening the water inlet valve of the rear filter tank, and obtaining the blending fluid after blending.

And 5, filtering the prepared solution by using a filter tank after preparation, discharging the filtered solution into a recycling pool for later use, pumping the recycling water into a UV sterilizer by using a recycling pool lifting pump, and then flowing through a recycling filter tank to a machine station water using point for recycling.

Preferably: the pH modifying agent A is 10-15% of citric acid. The turbidity modifying agent 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, accurate medicine adding can be realized, filter cloth leakage points can be quickly and accurately eliminated, and filter pressing black liquid can be timely found and eliminated; the outer tank is automatically controlled to discharge liquid in normal operation or to flow back in abnormal operation according to the turbidity value, and the flushing section is controlled to flow back; the inner tank is black liquid yielding water in initial stage, abnormal investigation, emergency, maintenance and flushing section; high silicon powder recovery rate, stable filtrate effluent index, simple system operation and low operating cost.

2. The recycling section adopts multi-stage fine filtration, combines a double-tank control flushing program to improve the recovery rate of the silicon powder in an all-round way, and automatically controls the adding and supplementing amount of the blending agent of the recycling system through online monitoring of water quality parameters and accurate calculation.

3. According to the invention, the silicon recovery part is subjected to pH adjustment and chemical addition, and other chemical agents are not added, so that the recovery quality of the silicon powder is high; after the silicon of the cutting fluid is removed, new cutting fluid is prepared and recycled, and then the cutting fluid returns to a machine station water consumption point to achieve recycling, so that near zero emission of wastewater is realized. The invention has wide application range and simple operation, realizes the maximization of resources while controlling the water pollution and has obvious environmental and social benefits.

4. The reaction speed is high, the filter-pressing black liquid can be prevented and removed, the recovery efficiency of the silicon powder is high, the automation degree is high, the solid content of the sludge obtained by filter-pressing is high, and the recovery quality of the silicon resource is high; the filter-pressing clear liquid after the system treatment is recycled through advanced treatment such as blending, filtering, disinfection and the like, and the recycling system can accurately control the liquid supplementing amount and meet the requirement of the recycling of the slices. The invention can be applied to filter pressing and recycling treatment of other industrial wastewater, can not only avoid turbid liquid at the initial stage of filter pressing, but also timely monitor and deal with various abnormal conditions influencing the outflow of clear liquid in the filter pressing process through the control of an automatic program.

Drawings

FIG. 1 is a flowchart of an embodiment silicon resource recovery process.

FIG. 2 is a flow chart of a water resource recycling process.

Figure 3 is a schematic view of a double tank section of a filter press.

Description of reference numerals:

1. a regulating reservoir, 12, a regulating reservoir lift pump, 121, a hardening and tempering tank water inlet pipe, 21 and a water inlet pipeline.

2. The device comprises a tempering tank, 13, a tempering feed pump, 17, feeding pipes A and 171, a feeding automatic valve, 18, feeding pipes B and 201, a tempering tank pH meter, 22, a tempering feed pipe, 221 and a back-flushing feed pipe.

3. 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 turning plate liquid outlet 1, 3032, 3033, a turning plate liquid outlet pipe, 310, a high-pressure cleaning port, 311, a back flushing 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, 3071, a left inner tank, 3072, a right inner tank, 3081, a left outer tank liquid receiving pipe, 3082, a right outer tank liquid receiving pipe, 3091, a left inner tank liquid receiving pipe, 3092 and a right inner tank liquid receiving pipe.

4. The device comprises an intermediate tank, 14, an intermediate tank lift pump, 27, an intermediate tank water outlet pipe, 271, an intermediate tank flow meter, 272, an intermediate tank pH meter, 273, an intermediate tank conductivity meter, 281, a system discharge pipe, 2811 and a system discharge valve.

5. Preparing a front filter tank, 241, a flushing discharge pipe, 28, preparing a front filter tank water inlet pipe, 51, a front filter tank flushing opening, 52 and a front filter tank discharging opening.

6. The system comprises a preparation tank, 15 parts of a preparation tank lift pump, 19 parts of an RO water replenishing pipe, 20 parts of a new cutting fluid feeding pipe, 29 parts of a preparation tank water inlet pipe, 30 parts of a preparation tank water outlet pipe, 3001 parts of a preparation tank outlet water pH meter, 3002 parts of a preparation tank outlet water conductivity meter, 3003 parts of a preparation tank outlet water turbidity meter, 3004 parts of a preparation tank return valve, 3005 parts of a post-filter tank inlet valve, 3006 parts of a preparation tank bypass valve.

7. And (5) blending the post-filtration tank, 71, a post-filtration tank flushing port, 72 and a post-filtration tank discharge port.

8. A recycling pool, 16, a recycling pool lifting pump, 31, a recycling pool water inlet pipe, 32, a recycling pool water outlet pipe, 351, a return pipe backpressure valve, 35 and a water consumption point return pipe.

9. A UV sterilizer.

10. A recycling filter tank 33 and a recycling filter tank water inlet pipe.

11. A machine station water consumption point 34 and a water consumption point water inlet pipe.

Detailed Description

The present invention is further illustrated by the following description in conjunction with the accompanying drawings and the specific embodiments, it is to be understood that these examples are given solely for the purpose of illustration and are not intended as a definition of the limits of the invention, since various equivalent modifications will occur to those skilled in the art upon reading the present invention and fall within the limits of the appended claims.

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 recycling system, silicon resource recovery system includes section waste water regulating unit, section waste water quenching and tempering unit and double flute filter pressing unit, wherein:

The section waste water regulating unit includes equalizing basin 1, section waste water quenching and tempering unit includes quenching and tempering jar 2, double flute filter pressing unit includes membrane filter press 3, wherein:

be provided with water intake pipe 21 on the equalizing basin 1, communicate through quenching and tempering jar inlet tube 121 between equalizing basin 1 and the quenching and tempering jar 2, be provided with equalizing basin elevator pump 12 on the quenching and tempering jar inlet tube 121.

And the tempering tank 2 is provided with an adding pipe A17, and the adding pipe A17 is provided with an adding automatic valve 171. And a pH meter 201 of the tempering tank is arranged in the tempering tank 2. The tempering tank 2 is communicated with a feeding material returning port 301 of the membrane filter press 3 through a tempering feeding pipe 22. The tempering feed pipe 22 is provided with a tempering feed pump 13 and a first valve in sequence along the water flow direction. The tempering feed pipe 22 between the tempering feed pump 13 and the first valve is communicated with one end of the back-blowing return pipe 221, and the other end of the back-blowing return pipe 221 is communicated with the regulating tank 1.

The membrane filter press 3 is equipped with 6 flange interfaces, including feeding and blowback feed back mouth, connects high-pressure running water circulation system's the mouth that squeezes, connects high-pressure cleaning system's washing mouth, connects compressed air system's blowback mouth, and the board liquid outlet that turns over of board drain pipe is turned over in the intercommunication, turns over the board liquid outlet and the inside groove joins the pipe switch-on, membrane filter press 3 joins pipe 24 and equalizing basin 1 intercommunication through the inside groove, membrane filter press 3 passes through the outside groove delivery pipe 25 and communicates with middle pond 4, be provided with outside groove turbidimeter 231, outside groove discharge valve 251 on the outside groove delivery pipe 25. One end of an outer tank return pipe 26 is connected to an outer tank discharge pipe 25 between the outer tank turbidity meter 231 and the outer tank discharge valve 251, the other end of the outer tank return pipe 26 is communicated with the inner tank junction pipe 24, and an outer tank return valve 261 is provided to the outer tank return pipe 26. The automatic washing high-pressure membrane filter press is provided with an automatic pulling plate and an automatic liquid receiving turning plate, and can automatically wash filter cloth, and each interface of the filter press is provided with a neck flange. Two sides of the bottom of a filter plate of the membrane filter press are provided with an inner liquid receiving tank and an outer liquid receiving tank, the width ratio of the inner tank to the outer tank is 2:3, the total width is 1000mm, and the filter plate is made of stainless steel. The filter pressing liquid receiving double grooves are provided with a certain gradient along the length direction of the frame, the groove depth of the starting end is 300mm, and the groove depth of the tail end is 350-400 mm; the tail end of the double groove is provided with a liquid receiving pipe, and the liquid receiving pipes on the two sides of the double groove are communicated and converged and then discharged or refluxed. The top of the inner groove is provided with a first movable cover plate, the top of the outer groove is provided with a second movable cover plate, and the first movable cover plate and the second movable cover plate can be manually and automatically integrated to control the cover plates to move to open and close. The membrane filter press is provided with a double-water nozzle for discharging liquid and is positioned above the double grooves, the outer-layer water nozzle is connected into the outer groove, and the inner-layer water nozzle is connected into the inner groove; wherein the inner groove water nozzle valve is normally closed, the outer groove water nozzle valve is normally open, and the outer groove discharge pipe is provided with an outer groove turbidimeter for automatically controlling the outward liquid direction of the outer groove. The flushing splashing liquid of the filter pressing flushing system can be discharged from the inner groove, and the turning plate is connected with the liquid and is discharged together with the liquid discharged from the inner groove.

The double-groove filter pressing unit comprises a pressing module and a back blowing module, 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 backflow liquid, and the back blowing backflow liquid flows back to the slice wastewater adjusting unit. The slicing wastewater adjusting unit is used for stirring slicing wastewater raw water, UV disinfection blending liquid, outer tank filter pressing liquid and back flushing backflow liquid to obtain stirred slicing wastewater. And the squeezing module is used for injecting high-pressure tap water serving as a squeezing medium into the elastic diaphragm plate between the filter cloth and the filter plate when feeding is finished, so that the filter cloth is expanded and deformed, the filter cake is further dehydrated due to squeezing, and water flows back to the tap water storage system after squeezing is finished.

As shown in fig. 3, the membrane filter press 3 includes a left side filter pressing structure and a right side filter pressing structure, the left side filter pressing 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 and 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 liquid receiving pipe 3081 communicates with the outer tank confluent pipe 23, the outer tank confluent pipe 23 communicates with the outer tank discharge pipe 25, and the left inner tank liquid receiving pipe 3091 communicates with the inner tank confluent pipe 24. The right side filter pressing structure comprises a right side outer groove water nozzle valve 3042, a right side inner groove water nozzle valve 3052, a right side outer groove 3062, a right side inner groove 3072, a right side outer groove liquid receiving pipe 3082 and a right side inner groove liquid receiving pipe 3092, the right side outer groove water nozzle valve 3042 is connected with the right side outer groove 3062, the right side inner groove water nozzle valve 3052 is connected with the right side inner groove 3072, the right side outer groove liquid receiving pipe 3082 is arranged on the right side outer groove 3062, and the right side inner groove liquid receiving pipe 3092 is arranged on the right side inner groove 3072. The right outer tank liquid receiving pipe 3082 communicates with the outer tank junction pipe 23, the outer tank junction pipe 23 communicates with the outer tank discharge pipe 25, and the right inner tank liquid receiving pipe 3092 communicates with the inner tank junction pipe 24.

As shown in fig. 1, the upper end of the middle tank is connected with an outer tank discharge pipe, and the lower end of the middle tank is connected with a middle tank lift pump; after each function monitoring instrument is connected on the water outlet pipe of the intermediate tank, the water outlet is divided into 2 paths, one path is discharged to a wastewater station by a system discharge pipe, and the other path of water outlet is connected with a water inlet pipe of the filter tank before allocation and enters a rear-section water resource recycling system. Specifically, be provided with middle pond outlet pipe 27 on middle pond 4, the one end that middle pond outlet pipe 27 is close to middle pond 4 is provided with middle pond elevator pump 14, the one end that middle pond outlet pipe 27 is kept away from middle pond 4 is provided with middle pond flowmeter 271, middle pond pH meter 272, middle pond conductivity meter 273. The water outlet end of the water outlet pipe 27 of the intermediate tank is connected with a system discharge pipe 281, and a system discharge valve 2811 is arranged on the system discharge pipe 281. The system drain valve 2811 is a pneumatic butterfly valve and is linked with a pH meter and a conductivity meter of the intermediate tank to control the drain water of the system.

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 consumption point 11.

The pre-blending filter tank 5 is provided with a pre-blending filter tank water inlet pipe 28, a pre-filtering tank flushing port 51 and a pre-filtering tank discharging port 52, and the pre-blending filter tank water inlet pipe 28 is communicated with the water outlet end of the intermediate tank water outlet pipe 27. The front canister drain port 52 communicates with a flush drain pipe 241, and the flush drain pipe 241 communicates with the inner tank junction pipe 24.

The blending tank 6 is provided with an RO water replenishing pipe 19, a new cutting fluid dosing pipe 20, a blending tank water inlet pipe 29 and a blending tank water outlet pipe 30, and the blending tank water inlet pipe 29 is communicated with a discharge hole of the filter tank 5 before blending. One end that blending jar outlet pipe 30 is close to blending jar 6 is provided with blending jar elevator pump 15, the one end that blending jar outlet pipe 30 kept away from blending jar 6 is provided with blending jar play water pH meter 3001, blending jar play water conductivity meter 3002, blending jar play water turbidimeter 3003, be provided with the other pipe of blending jar on the blending jar outlet pipe 30, be provided with blending jar bypass valve 3006 on the other pipe of blending jar. A blending tank return pipe is arranged on the blending tank water outlet pipe 30, a blending tank return valve 3004 is arranged on the blending tank return pipe, 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 a 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 a flushing discharge pipe 241. The filtering tanks before and after blending adopt stainless steel filter elements which can be repeatedly and manually or automatically washed, and the filtering precision is respectively 10 μm and 3 μm.

Be provided with retrieval and utilization pond inlet tube 31, retrieval and utilization pond outlet pipe 32, water consumption point back flow 35 on the retrieval and utilization pond 8, retrieval and utilization pond inlet tube 31 communicates with the back filter tank discharge gate of allotment back filter tank 7, water consumption point back flow 35 and board water consumption point 11 intercommunication, be provided with back flow back pressure valve 351 on the water consumption point back flow 35. And one end of the water outlet pipe 32 of the recycling pool, which is close to the recycling pool 8, is provided with a recycling pool lifting pump 16.

The UV sterilizer is characterized in that a sterilizer liquid inlet pipe and a sterilizer liquid outlet pipe are arranged on the UV sterilizer 9, the sterilizer liquid inlet pipe is communicated with a recycling pool water outlet pipe 32, a sterilizer liquid inlet valve is arranged on the sterilizer liquid inlet pipe, and a sterilizer liquid outlet valve is arranged on the sterilizer liquid outlet pipe.

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 the sterilizer liquid outlet pipe and the recycling pool water outlet pipe 32.

The board is provided with water spot inlet tube 34, water spot backward flow mouth and water inlet pipe mouth on with the water spot, filter jar outlet pipe intercommunication is crossed with the retrieval and utilization of retrieval and utilization filtration jar 10 to water spot inlet tube 34, water spot backward flow mouth and water spot back flow 35 intercommunication, water inlet pipe mouth and inlet channel 21 intercommunication.

The slice wastewater flows into a regulating tank through a pipeline for homogenizing and homogenizing, and then enters a tempering tank for tempering and filter pressing. The system automatically controls the adding amount and time of the conditioning agent, primary filter water in the early stage of the filter press returns to the regulating tank through the inner tank of the filter press transformation structure, wastewater in the normal operation stage is subjected to filter pressing through the high-pressure diaphragm plate frame, suspended matters such as silicon powder and the like are effectively intercepted by filter cloth to form silicon sludge to be recovered, and clear liquid flows into the intermediate tank for reuse. And the recycling section optimizes multistage filtration, and automatically controls the adding and supplementing amount of the blending agent through online monitoring of water quality parameters and accurate calculation. The invention improves the outflow control mode of the filter-pressing clear liquid, adopts a filter-pressing double-groove structure, the outer groove automatically controls the outflow of the liquid in normal operation or the backflow in abnormal operation according to the turbidity value, and the flushing section controls the backflow; the inner tank is black liquid water outlet in the initial stage, abnormal investigation, emergency, maintenance and flushing stage.

The utility model provides a control system of section waste water resourceization, includes quenching and tempering, operation, investigation, emergent, maintenance, washes, allotment and retrieval and utilization 8 sections control program, can avoid filter-pressing black liquid, and the maximize is retrieved and is utilized silica flour and cutting liquid resource, and concrete program control step is as follows:

(1) tempering: internal groove

Discharging the slicing wastewater into an adjusting tank through a water inlet pipeline, starting a lifting pump of the adjusting tank and a water inlet pipeline of a tempering tank, starting a dosing system, automatically controlling the start-stop time of a citric acid dosing metering pump according to the actually measured pH value of the tempering tank, and keeping the pH value at 6.0-6.5. And (3) putting the conditioning agent B solution with the concentration of 20-30% into a conditioning feeding pipe at regular time and quantity by using a mechanical diaphragm metering pump, starting a conditioning feeding pump, and performing primary filtration by using a filter press. In the control section, the outer groove water nozzle valve is closed, the inner groove water nozzle valve is opened, the outer groove cover plate is completely closed, and the inner groove cover plate is completely opened. The adding amount of the conditioner B is determined by the concentration of the suspended matters in the inlet water, the adding time is 3min, and the program control principle is as follows: SS is less than 15000, and the adding amount is 0.5-1.5%; 15000< SS <25000, and the adding amount is 1.5-2.0%. The adding mode of the turbidity modifying agent B is a pipeline mixing mode, the concentration of W is 20-30%, and the adding of the turbidity modifying agent B is controlled by a metering pump according to time setting; the addition amount of the conditioning agent W is 0.5-2.0% of the volume flow of the slicing wastewater, the addition time is 3min, and the addition concentration of W is controlled by the SS content of the slicing wastewater.

(2) The operation section is as follows: outer groove row

Closing the feeding pipeline of the conditioner B, closing an inner groove water nozzle valve, opening an outer groove water nozzle valve, discharging liquid through normal filter pressing, wherein the normal display value of an outer groove turbidimeter is 60-80, at the stage, opening an outer groove discharge valve, and closing a return pipe valve. The inner groove cover plates of the operation sections are all closed, and the outer groove cover plates are all opened.

(3) A checking section: problem filter cloth with open inner groove and open outer back

When the value NTU of the turbidimeter of the outer tank is more than 100, the discharge valve of the outer tank is automatically closed, and the return valve of the outer tank is opened; the water nozzles of the filter press which are abnormally discharged are manually checked, the defective filter cloth is found out, the outer groove water nozzle valve at the position is closed, the inner groove water nozzle valve is opened, meanwhile, the outer groove cover plate corresponding to the water nozzle at the position is closed, the inner groove cover plate corresponding to the inner groove water nozzle is opened, each cover plate is 1m long, every two cover plates are in a group and divided into an upper layer and a lower layer, the manual operation and the automatic operation can be realized by manually pulling a sliding plate or a corresponding group of cover plate button boxes. And in the investigation section, the unqualified filter pressing liquid flows through the outer groove return pipe and the inner groove filter pressing black liquid and flows back to the regulating reservoir through the inner groove converging pipe.

(4) An emergency section:

after the program is checked, black liquor discharged from the filter cloth with individual problems of the filter press flows back to the regulating tank from the inner tank, other filter cloth flows out to the outer tank in an emergency mode, after the turbidity meter of the outer tank recovers to a 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 normally discharges water to the intermediate tank.

(5) Maintenance section: the new filter cloth is opened in an outer groove and is discharged outside

And a maintenance program section, namely replacing the filter cloth with a leakage point by using new filter cloth, and before replacement, stopping the tempering feed pump, switching the water nozzle valve of the newly replaced filter cloth to an outer tank to be opened, and switching the inner tank to be closed. At this stage, the double-groove cover plate is completely opened, and the mud accumulation condition at the bottom is observed after water flow in the double grooves is clean.

(6) A washing section:

the flushing section comprises three programs of flushing I, flushing II and flushing III, wherein the flushing I program is arranged after the normal operation section (2):

the normal operation cycle of the filter press comprises a complete set of processes of tempering, feeding, pressure maintaining, squeezing, back flushing, pressure relief and mud discharging, the filter press normally operates for 2-3 cycles, after mud discharging is completed, a washing I program is started, a high-pressure washing plunger water pump is started, and one-by-one automatic cleaning of filter cloth of the filter plate is realized according to a limit switch installed on one side of the filter plate. Wash I procedure section, the inside groove apron is opened entirely, and the outer groove apron is closed entirely. The flushing splashing liquid flows back to the regulating tank from the inner tank, and the flushing discharge liquid is discharged into the regulating tank from the liquid outlet pipeline of the turning plate.

The flushing II procedure is after the maintenance section (5):

after the filter cloth of individual problems is changed, the double grooves are drained, the inner and outer groove bottoms are observed, and if more accumulated mud exists, a flushing II program is started. The normal operation of inside groove apron is the full cut-off, and the filter-pressing in-process can hardly have a small amount of black liquid or the mud piece that the filter cloth splash falls to be intercepted on the apron, washes II stages and can wash one by one to each group's apron, and the flush fluid flows into the inside groove, flows back to the equalizing basin. And simultaneously, washing the bottom of the double tanks by using tap water, closing the discharge valve of the outer tank, opening the reflux valve and discharging the washing liquid to the regulating tank. After the washing is finished, the operation section is entered, the regulating reservoir lifting pump and the tempering feed pump are opened again, and normal filter pressing and sludge discharge are carried out.

The maintenance section appears in one filter-pressing period, the filter-pressing period of the flushing II procedure is completed, the flushing I procedure can be started once, the high-efficiency silicon removal is ensured, and the service life of the filter cloth is prolonged.

And the flushing III program is set for 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 within 5-6 periods of system operation, manually observing pressure gauges of a filter tank before and after allocation, if the pressure difference between the two pressure gauges reaches a limit value, opening a top cover of the filter tank, detaching a stainless steel filter element, manually opening 2-4 inner groove cover plates of the filter press, putting the filter element into the opened inner groove, and manually flushing; and (3) automatically opening a flushing port and a discharge port valve of the filter tank according to time setting when the automatic flushing program runs for more than 6 periods in the system, and discharging the flushed water into an inner groove converging pipe and then into the regulating tank.

The 3 stages make wash flowing back and the ingenious combination of filter-pressing double flute structure, can multiple high-efficient the retrieving of assurance system silica flour.

(7) Blending section

Opening a lifting pump of the intermediate tank, automatically monitoring water quality parameters of a water outlet pipe of the intermediate tank, starting a blending tank stirrer, calculating water content data of the sludge subjected to filter pressing according to a formula (1), controlling the corresponding water supplementing amount of RO, and starting an RO water supplementing pipe valve to blend cutting fluid. Opening a lift pump of the blending tank, controlling a rear valve of the pump, opening a return valve of the blending tank, closing a water inlet valve and a bypass valve of the rear filter tank, automatically controlling the return flow for 1-2min, monitoring the water quality parameters of the inlet water of the blended filter tank, calculating the result according to the formula (2), controlling the supplement amount of the new cutting fluid, opening a dosing pipeline of the new cutting fluid, simultaneously closing the return pipeline of the blending tank, opening the water inlet valve of the rear filter tank, and completing the blending. The system control principle formula is as follows:

wherein: q_ROThe RO water supply amount is indicated, and enters the preparation tank 6 through an RO water supply pipe 19, Q_CNThe new cutting fluid water supplement amount is shown and enters the blending tank 6, Q through the new cutting fluid dosing pipe 20_CWIndicating the flow of liquid into the blending unit, detected by the intermediate tank flow meter 271, K_SRepresents the sludge water loss coefficient of the double-tank filter pressing unit, and P represents doubleWater content, Q, of filter-pressing sludge of tank filter-pressing unit_fIndicates the flow rate of raw water of the slicing wastewater, C_fShowing the concentration of suspended matter in the raw water of the slice wastewater, C_rExpressing the concentration of suspended matters in the filtrate, which can be measured by a portable sludge concentration meter, K_DUThe dilution coefficient of the new cutting fluid is shown, the use value of the cutting fluid is 300-350, and the pH value is₁Indicates the pH of the liquid entering the dispensing unit, as measured by the intermediate tank pH meter 272, pH₂The pH value of the prepared solution is detected by a pH meter 3001 of the outlet water of the preparation tank, and E₁Indicating the conductivity of the liquid entering the dosing unit, measured by the intermediate cell conductivity meter 273, E₂The conductivity of the prepared liquid is detected by a water conductivity meter 3002 of the preparation tank, T_b1Represents the turbidity of the filtrate in the outer tank and is measured by an outer tank turbidity meter 231, T_b2The turbidity of the prepared solution, which is obtained by the turbidity meter 3003, is measured by the preparation unit. Thus, RO water supply amount can be controlled according to the formula (1), and Q can be controlled according to the formula (2)_CNAnd (4) supplementing new cutting fluid.

The flow and the suspended matter concentration of the slice wastewater discharged into the regulating tank can be obtained from raw water quality data, the suspended matter concentration of the intermediate water tank is actually measured, the water content of the filter-pressing sludge can be obtained according to performance parameters of the filter press, the water loss of the sludge is considered, and the RO water supply amount can be controlled in real time according to a formula (1). In addition, the parameters of the effluent of the intermediate tank are obtained by an online instrument and respectively comprise turbidity Tb1, conductivity E1, flow rate Qcw and pH 1. According to the procedure of 1-2min at the initial stage of dosing, measuring the parameters of the water quality of the outlet water of the blending tank, namely the conductivity E2, the turbidity Tb2 and the pH2, K by an online instrument_DUThe cutting is obtained according to the characteristics of using a new cutting fluid, and thus, Q can be controlled according to the formula (2)_CNAnd (4) supplementing new cutting fluid.

The back flow of the pump is set by the blending program, and the system can accurately control the adding amount of the supplementary liquid through the change of the water quality parameters before and after the blending tank.

(8) A recycling section:

and starting a lifting pump of the recycling pool, opening an inlet valve and an outlet valve of the UV sterilizer, and enabling the recycled water to enter a machine station water consumption point of the slicing workshop after being filtered by a recycling filter tank terminal. And the surplus reuse water at the water consumption point flows back to the reuse pool, and the drainage water at the water consumption point is discharged into the front-end regulating pool for retreatment, so that a large cycle is completed. The system circulates for a certain time, and a system discharge valve is automatically opened by the system according to the conductivity value and the pH value of the intermediate tank and exceeding the limit value, and wastewater is discharged into a rear-stage wastewater station for treatment. The recycling section adopts a UV sterilizer and a PP filter element terminal for filtration, and the filter precision of the filter element of the recycling tank is 1 mu m. The water consumption point of the machine table is provided with surplus water backflow control, and the pipeline of the water consumption point is provided with a back pressure valve, so that the stability of the water pressure of the water consumption point can be ensured.

The concentration of SS in the regulating pool is 12000-30000mg/L, after being treated by a silicon resource recovery system, the SS in the intermediate pool can be reduced to 30-100 mg/L, and the silicon recovery rate is higher than 99.6 percent; the water resource recycling of the slicing wastewater can reach more than 20 times, and the wastewater is nearly zero-discharge.

A recycling method of slice wastewater resource comprises the following steps:

step 1, the slice waste water of taking the silica flour granule that section workshop board discharged passes through inlet channel 21 and discharges into equalizing basin 1, because of containing finer silica flour granule in the waste water, so set up the dive mixer in the equalizing basin, prevent the granule sedimentation bottom of the pool. After the waste water is homogenized, the waste water is lifted to a tempering tank by a wear-resistant slurry pump. The slicing wastewater is alkaline, and the silicon and alkali in the wastewater generate heat and generate H₂The reaction is as follows:

Si+2NaOH+H₂O＝Na₂SiO₃+2H₂↑

if the alkaline wastewater is directly subjected to filter pressing, the high temperature can cause the deformation of a filter plate of the filter press, and the filter pressing dehydration capability is reduced; the H2 enrichment in the air can cause safety accidents, so the pH conditioning is needed before the filter pressing. According to engineering debugging experience, the optimal pH economic range of the filter pressing silicon removal effect is 5-6, and the most suitable pH modifying agent A is 10-15% citric acid. Establish frame mixer in the quenching and tempering jar, the variability of considering the liquid level and personnel's maneuverability sets up the pH meter into jar side wall installation, both can guarantee that the test probe is below the liquid level, has reduced the length of installation protecting pipe again, simultaneously, manual check and washing convenient operation such as probe. The pH meter is associated with the adding start and stop of the modifying agent A, and the pH stability of the system is automatically controlled. Therefore, slice wastewater is pumped into the tempering tank 2 by the regulating reservoir lifting pump 12 for pH regulation, a pH tempering agent A is added through the adding pipe A17, the pH meter 201 of the tempering tank is linked with the automatic adding valve 171, and the pH value in the tank is controlled not to exceed 6.5.

Step 2: according to two requirements of the characteristics of the filter cloth, firstly, the water permeability and the water passing speed are ensured, secondly, a certain mesh number is ensured to intercept fine particles, and in the initial stage of filter pressing, the ultrafine silicon powder particles are not sufficiently intercepted, in order to improve the silicon removal efficiency, a turbidity modifying agent B is added in the initial filtering stage, the turbidity modifying agent B is added after a modifying feed pump through a pipeline, the mixture is quickly mixed by utilizing the pressure of the pipeline, and the mixture enters a filter press to quickly form a more compact filter layer on the surface of the filter cloth. The turbidity modifying agent B is perlite which takes silicon-aluminum oxide as a main component, the particle size is 0.1-1mm, the porosity is up to 85%, and the turbidity modifying agent B can form an adsorption bridging filter screen with silicon-containing particles in wastewater, can intercept most of the particles below 1 mu m, and can effectively prevent the generation of filter pressing black liquid. In order to improve the recovery rate of the silicon powder, the pressure filtrate in the quenching and tempering time within 3min flows out of the inner groove to the regulating tank, the adding pipe B is automatically closed when the time is up, the inner groove water nozzle valve and the inner groove cover plate are closed, and the next procedure is started.

And step 3: the slice wastewater after turbidity tempering is pumped into a membrane filter press 3 by a tempering feed pump 13 for primary filtration, meanwhile, the opening degree of a metering pump connected with a feeding pipe B18 is controlled according to the concentration of influent SS to control the feeding amount, inner groove water nozzle valves at two sides of the membrane filter press 3 are opened, and pressure filtrate is discharged from an inner groove to an inner groove converging pipe 24 through an inner groove liquid receiving pipe and returns to a regulating tank 1 through the inner groove converging pipe 24.

The wastewater enters a normal filter pressing operation procedure, a hardening and tempering feed pump is a wear-resistant slurry pump, the wastewater containing silicon powder particles is pressed into a filter press, suspended matters such as the particles are intercepted by filter cloth, and finally the wastewater is discharged in a silicon mud mode; and (3) discharging the clear liquid as pressure filtrate from the filter pressing outer tank, monitoring the water quality of the pressure filtrate by an outer tank turbidimeter, opening an outer tank discharge pipeline when the NTU is less than 100, and discharging the liquid to an intermediate tank. The operation cycle of the common filter press comprises tempering, feeding, pressure maintaining, pressure relief and sludge discharge, and in order to further reduce the water content of the sludge, the invention adds a squeezing and back blowing procedure after the pressure maintaining. And when the feeding is finished, the feeding valve is automatically closed, tap water is injected into the elastic diaphragm 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, water flows back to a tap water storage system after the squeezing is finished, and the water is circularly operated every period. After squeezing, a back-flushing valve is opened, compressed air is introduced, high-pressure air passes through the filter cake, moisture such as capillary water, structural water and the like in the filter cake is further separated, and the water content of the filter cake is reduced to the minimum. The back-blowing reflux liquid returns to the regulating reservoir through a reflux pipeline. In the filter pressing process, filter cloth dripping liquid is collected by the turning plate and is connected with the inner groove converging pipe and then is discharged into the regulating tank. And finally, discharging the mud, and finishing a cycle process by a silicon mud resource recovery system.

And 4, step 4: 2 ~ 3 cycles of filter-pressing normal operating, after unloading mud, open high pressure cleaning mouth (310) department tap water pipeline, wash the filter plate filter cloth one by one, wash the splash liquid and fall into both sides inside groove backward flow equalizing basin, the flush fluid then goes out the liquid to the equalizing basin through turning over the board, and the at utmost avoids silica flour to run off, guarantees the desiliconization efficiency more than 99% of system.

And 5: when the value of the turbidimeter (231) of the outer tank is more than 100 in operation, the filter cloth and the effluent enter an inspection, emergency and maintenance section, the problem filter cloth and the effluent are discharged from the inner tank, the normal filter cloth effluent flows back to the junction pipe of the inner tank from the outer tank, and after the abnormity is eliminated, the effluent of the outer tank automatically opens a discharge pipeline after the turbidimeter recovers to a normal value. And after replacing individual leakage filter cloth, executing a flushing program II to clean the double tanks, and enabling cleaning drainage to flow out of the inner tank and return to the regulating tank for retreatment.

Step 6: the wastewater after silicon removal enters an intermediate tank (1), and sequentially enters a pre-blending filter tank (5), a blending tank (6) and a post-blending filter tank (7) through lifting. By monitoring the pH value, the conductivity value and the flow value of the outer tank turbidimeter (231) and the water outlet pipe (27) of the intermediate tank, and setting programs and calculation modes according to the allocation section, the cutting fluid loss can be supplemented more accurately. The specific formula is as follows:

flow Q of slice waste water raw water quality data discharged into regulating reservoir_fAnd suspended matter concentration C_fThe suspended matter in the intermediate water pool is concentratedThe degree can be measured by a portable sludge concentration meter in real time_rThe water content P of the filter-pressing sludge can be obtained according to the performance parameters of the filter press, and the water loss coefficient K of the sludge is considered_sThe water consumption can be obtained in real time according to the formula (1). The invention adopts secondary RO concentrated water recycled from the waste water station as make-up water Q_ROControlling in association with the RO water replenishing pipe (19) system:

wherein: q_ROThe RO water supply amount is indicated, and enters the preparation tank 6 through an RO water supply pipe 19, Q_CNThe new cutting fluid water supplement amount is shown and enters the blending tank 6, Q through the new cutting fluid dosing pipe 20_CWIndicating the flow of liquid into the blending unit, detected by the intermediate tank flow meter 271, K_SThe water loss coefficient of the sludge of the double-tank filter pressing unit is shown, P represents the water content of the filter pressing sludge of the double-tank filter pressing unit, and Q_fIndicates the flow rate of raw water of the slicing wastewater, C_fShowing the concentration of suspended matter in the raw water of the slice wastewater, C_rExpressing the concentration of suspended matters in the filtrate, which can be measured by a portable sludge concentration meter, K_DUThe dilution coefficient of the new cutting fluid is shown, the use value of the cutting fluid is 300-350, and the pH value is₁Indicates the pH of the liquid entering the dispensing unit, as measured by the intermediate tank pH meter 272, pH₂The pH value of the prepared solution is detected by a pH meter 3001 of the outlet water of the preparation tank, and E₁Indicating the conductivity of the liquid entering the dosing unit, measured by the intermediate cell conductivity meter 273, E₂The conductivity of the prepared liquid is detected by a water conductivity meter 3002 of the preparation tank, T_b1Represents the turbidity of the filtrate in the outer tank and is measured by an outer tank turbidity meter 231, T_b2The turbidity of the prepared solution, which is obtained by the turbidity meter 3003, is measured by the preparation unit. Thus, RO compensation can be controlled according to equation (1)Water amount, Q can be controlled according to the formula (2)_CNAnd (4) supplementing new cutting fluid.

And (3) obtaining the water consumption in real time according to the formula (1), and adopting the secondary RO concentrated water recycled from the water in the wastewater station as make-up water, so as to save water and reduce consumption. Q_ROAssociated with the RO water supply pipe 19, controlling Q according to the formula (2)_CNAnd (3) opening a lift pump 15 of the blending tank, controlling a rear valve of the pump, opening a reflux valve 3004 of the blending tank, closing a water inlet valve 3005 of the rear filter tank and a bypass valve 3006 of the blending tank, controlling the replenishment amount of the new cutting fluid, opening a dosing pipe 20 of the new cutting fluid, closing a reflux pipeline of the blending tank, opening a water inlet valve of the rear filter tank, and completing blending to obtain the blended fluid.

The front and rear filter tanks adopted in the blending process are stainless steel filter elements, the pressure resistance is 6 kilograms, the difference of the front and rear pressure meter values of the filter tanks is 1bar, the filter tanks can be washed and repeatedly and manually or automatically washed, the filtering precision is respectively 10 mu m and 3 mu m, and a small amount of silicon powder particle systems brought out by washing can also return to the inner groove converging pipe and then return to the regulating tank, so that the outflow system is avoided.

And 7: and discharging the wastewater into a recycling pool for later use after two-stage filtration and blending. The prepared and filtered wastewater has the condition of recycling cutting fluid, the pollution of bacteria and microorganisms is eliminated through an ultraviolet sterilizer considering the condition that bacteria are difficult to breed in the system circulation process, the sanitary condition of the recycled water is ensured, meanwhile, a terminal precise filtration is added after the disinfection and sterilization, the precision is 1 mu m, and the index of the suspended matters in the recycled water is qualified. Pumping the reuse water into the UV sterilizer through a lifting pump of the reuse pool, and then flowing through the reuse filter tank to the water consumption point of the machine for reuse. In order to ensure that each water using point of the machine station keeps a certain water pressure, the incomplete surplus water in a workshop flows back to a recycling pipe of a recycling pool to be provided with a back pressure valve, and the waste water generated after the machine station is used is discharged into a front-section water inlet pipeline of the system, so that a large circulation is completed, and near zero emission of the waste water is realized. The system circulates for more than 20 periods, the conductance value and the pH value of the intermediate pool are monitored, the conductance value exceeds 300 or the pH value exceeds the limit value of 6.5, a system discharge valve is automatically opened, and the wastewater is discharged into a rear-stage wastewater station for treatment.

The slice wastewater treatment engineering and design of a certain project of BaotouThroughput 4800m³And d, the pH value of inlet water is 7-9, the content of 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 rejection rate of 1-3 mu m fine particles is 90%. The filter cloth adopted by the project is N-shaped, the mesh number is 1200, and after the filter cloth is combined with a dosing agent for primary filtration for 3min, a filter layer with an adsorption bridging effect is formed on the surface of the filter cloth in a short time, most particles with the particle size less than 1 mu m can be filtered, fine silicon powder is prevented from penetrating through the filter cloth, and the generation of filter pressing black liquid is effectively prevented. The pump of the silicon recovery system is a wear-resistant slurry pump made of UHMWPE, and the pump of the water recycling system is a centrifugal pump made of overflowing stainless steel 304; the ultraviolet disinfection adopts 254nm wavelength.

The filter cloth is replaced by one filter cloth according to the operation of a troubleshooting program, and the filter press black liquid is removed. The normal washing procedure I is operated once every 2 filter pressing cycles, the accumulated mud on the inner groove cover plate is washed periodically, and the deposited silicon powder at the bottoms of the inner groove and the outer groove is washed and cleaned, so that the loss of silicon resources is reduced to the maximum extent.

The SS of the slicing wastewater inlet water of the project is more than 25000mg/L, after the slicing wastewater inlet water is treated by the system, the SS of a slicing wastewater filtrate pool is stabilized below 100mg/L, the recovery rate of silicon powder reaches more than 99.6 percent, the system filter cloth is less frequently cleaned, and the operation is simple; the slice recycling system circularly operates for 25 times to discharge once wastewater to a wastewater station, and the ratio of the operation water supplement amount to the wastewater amount is basically controlled to be 1: 400, the first two stainless steel filter elements are self-cleaned for 5 times per month and manually cleaned for 1 time, and the pp filter element at the terminal is washed once every half month and replaced once per month. The whole wastewater recycling system has high automatic control degree, high recovery rate, standard recycled water quality and stable system operation effect.

The above description is only of the preferred embodiments of the present invention, and it should be 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 invention and these are intended to be within the scope of the invention.

Claims

1. The utility model provides a section waste water resourceful treatment retrieval and utilization device which characterized in that: including silicon resource recovery system and water resource recycling system, silicon resource recovery system includes section waste water regulating unit, section waste water quenching and tempering unit and double flute filter pressing unit, wherein:

the slicing wastewater adjusting unit is used for stirring raw slicing wastewater, reuse water and outer tank filter pressing liquid to obtain stirred slicing wastewater;

the slicing wastewater conditioning unit is used for firstly carrying out pH adjustment on the stirred slicing wastewater to obtain the slicing wastewater after pH adjustment; then carrying out turbidity hardening and tempering on the slicing wastewater after pH regulation to obtain slicing wastewater after turbidity hardening and tempering;

the double-groove filter pressing unit is used for carrying out filter pressing on the turbidity-modified slicing wastewater, and particle suspended matters in the turbidity-modified slicing wastewater are intercepted by filter cloth to obtain silicon mud, inner groove pressure filtrate and outer groove pressure filtrate; discharging the silicon mud into a silicon mud bin, returning the inner groove pressure filtrate to the slicing wastewater adjusting unit, and feeding the outer groove pressure filtrate into a water resource recycling system;

the blending unit is used for performing RO water supplement on the outer tank filter pressing liquid and blending new cutting liquid to obtain blended liquid;

the recycling unit is used for recycling the obtained blending liquid to obtain recycled water.

2. The slice wastewater recycling treatment and reuse device according to claim 1, characterized in that: the double-groove filter pressing unit comprises a back blowing module, the back blowing module is used for introducing compressed air, the high-pressure air passes through the filter cake, the moisture 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 slicing wastewater adjusting unit is used for stirring slicing wastewater raw water, UV disinfection blending liquid, outer tank filter pressing liquid and back flushing backflow liquid to obtain stirred slicing wastewater.

3. The slice wastewater recycling treatment and reuse device according to claim 2, characterized in that: the double-groove filter pressing unit comprises a pressing module, the pressing module is used for injecting high-pressure tap water serving as a pressing medium into an elastic diaphragm plate between the filter cloth and the 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 flows back to a tap water storage system after pressing is finished.

4. The slice wastewater recycling treatment and reuse device according to claim 3, characterized in that: the blending formula of the blending unit is as follows:

5. The slice wastewater recycling treatment and reuse device according to claim 4, characterized in that: 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:

a water inlet pipeline (21) is arranged on the adjusting tank (1), the adjusting tank (1) is communicated with the tempering tank (2) through a tempering tank water inlet pipe (121), and an adjusting tank lift pump (12) is arranged on the tempering tank water inlet pipe (121);

an adding pipe A (17) is arranged on the tempering tank (2), and an adding automatic valve (171) is arranged on the adding pipe A (17); a pH meter (201) of the tempering tank is arranged in the tempering tank (2); the tempering tank (2) is communicated with a feeding and returning port (301) of the membrane filter press (3) through a tempering feeding 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 feeding pipe (22) between the tempering feeding pump (13) and the first valve is communicated with one end of a back-blowing material return pipe (221), and the other end of the back-blowing material return pipe (221) is communicated with the regulating tank (1);

the membrane filter press (3) is communicated with the regulating tank (1) through an inner groove converging pipe (24), the membrane filter press (3) is communicated with the middle tank (4) through an outer groove discharge pipe (25), and an outer groove turbidimeter (231) and an outer groove discharge valve (251) are arranged on the outer groove discharge pipe (25); one end of 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).

6. The slice wastewater recycling treatment and reuse device according to claim 5, characterized in that: the device comprises an intermediate tank (4), wherein an intermediate tank water outlet pipe (27) is arranged on the intermediate tank (4), an intermediate tank lifting pump (14) is arranged at one end, close to the intermediate tank (4), of the intermediate tank water outlet pipe (27), and an intermediate tank flowmeter (271), an intermediate tank pH meter (272) and an intermediate tank conductivity meter (273) are arranged at one end, far away from the intermediate tank (4), of the intermediate tank water outlet pipe (27); the water outlet end of the water outlet pipe (27) of the intermediate tank is connected with a system discharge pipe (281), and a system discharge valve (2811) is arranged on the system discharge pipe (281).

7. The slice wastewater recycling treatment and reuse device according to claim 6, characterized in that: 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 consumption point (11);

a water inlet pipe (28) of the pre-blending filter tank, a flushing port (51) of the pre-blending filter tank and a discharge port (52) of the pre-blending filter tank are arranged on the pre-blending filter tank (5), and the water inlet pipe (28) of the pre-blending filter tank is communicated with the water outlet end of a water outlet pipe (27) of the intermediate tank; the front canister drain port (52) communicating with a flush drain pipe (241), the flush drain pipe (241) communicating with an inner tank junction pipe (24);

the blending tank (6) is provided with an RO water replenishing pipe (19), a new cutting fluid dispensing pipe (20), a blending tank water inlet pipe (29) and a blending tank water outlet pipe (30), and the blending tank water inlet pipe (29) is communicated with a discharge hole of the pre-blending filter tank (5); 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 outlet water pH meter (3001), a blending tank outlet water conductivity meter (3002) and a blending tank outlet water 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 mixing tank return pipe is arranged on the mixing tank water outlet pipe (30), a mixing tank return valve (3004) is arranged on the mixing tank return pipe, and a water outlet of the mixing tank return pipe is communicated with a mixing tank (6);

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 are formed in the blended filter tank (7), the rear filter tank inlet is communicated with a blending tank water outlet pipe (30), a rear filter tank water inlet valve (3005) is arranged on the rear filter tank inlet, and the rear filter tank discharge port (72) is communicated with a flushing discharge pipe (241);

a recycling pool water inlet pipe (31), a recycling pool water outlet pipe (32) and a water consumption point return pipe (35) are arranged on the recycling pool (8), the recycling pool water inlet pipe (31) is communicated with a discharge hole of a rear filter tank of the blended 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); one end of the water outlet pipe (32) of the recycling pool, which is close to the recycling pool (8), is provided with a recycling pool lifting pump (16);

a sterilizer liquid inlet pipe and a sterilizer liquid outlet pipe are arranged on the UV sterilizer (9), the sterilizer liquid inlet pipe is communicated with a recycling pool water outlet pipe (32), a sterilizer liquid inlet valve is arranged on the sterilizer liquid inlet pipe, and a sterilizer liquid outlet valve is arranged on the sterilizer liquid outlet pipe;

a recycling filter tank water inlet pipe (33) and a recycling filter tank water outlet pipe are arranged on the recycling filter tank (10), 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 board is provided with water spot inlet tube (34), water spot backward flow mouth and water inlet pipe mouth on with the water spot, filter a jar outlet pipe intercommunication with the retrieval and utilization of retrieval and utilization filter jar (10) with water spot inlet tube (34), water spot backward flow mouth and water spot back flow (35) intercommunication with the retrieval and utilization, water inlet pipe mouth and inlet channel (21) intercommunication.

8. The slice wastewater recycling treatment and reuse device according to claim 7, characterized in that: the membrane filter press (3) comprises a left side filter pressing structure and a right side filter pressing structure, the left side filter pressing structure comprises a left side outer groove water nozzle valve (3041), a left side inner groove water nozzle valve (3051), a left side outer groove (3061), a left side inner groove (3071), a left side outer groove liquid receiving pipe (3081) and a left side inner groove liquid receiving pipe (3091), the left side outer groove water nozzle valve (3041) is connected with the left side outer groove (3061), the left side inner groove water nozzle valve (3051) is connected with the left side inner groove (3071), the left side outer groove liquid receiving pipe (3081) is arranged on the left side outer groove (3061), and the left side inner groove liquid receiving pipe (3091) is arranged on the left side inner groove (3071); the left outer tank liquid receiving pipe (3081) is communicated with an outer tank converging pipe (23), the outer tank converging pipe (23) is communicated with an outer tank discharge pipe (25), and the left inner tank liquid receiving pipe (3091) is communicated with an inner tank converging pipe (24); the right side filter pressing structure comprises a right side outer groove water nozzle valve (3042), a right side inner groove water nozzle valve (3052), a right side outer groove (3062), a right side inner groove (3072), a right side outer groove liquid receiving pipe (3082) and a right side inner groove liquid receiving pipe (3092), the right side outer groove water nozzle valve (3042) is connected with the right side outer groove (3062), the right side inner groove water nozzle valve (3052) is connected with the right side inner groove (3072), the right side outer groove liquid receiving pipe (3082) is arranged on the right side outer groove (3062), and the right side inner groove liquid receiving pipe (3092) is arranged on the right side inner groove (3072); the right outer groove liquid receiving pipe (3082) is communicated with the outer groove converging pipe (23), the outer groove converging pipe (23) is communicated with the outer groove discharge pipe (25), and the right inner groove liquid receiving pipe (3092) is communicated with the inner groove converging pipe (24).

9. The recycling method of the slicing wastewater recycling treatment recycling device based on claim 8 is characterized by comprising the following steps:

step 1, discharging slicing wastewater with silicon powder particles into an adjusting tank (1) through a water inlet pipeline (21), arranging a stirrer in the tank, stirring the slicing wastewater through the stirrer, pumping the slicing wastewater into a tempering tank (2) through an adjusting tank lifting pump (12) for pH adjustment, adding a pH tempering agent A through an adding pipe A (17), linking a tempering tank pH meter (201) with an automatic adding valve (171), and controlling the pH value in the tank to be not more than 6.5; adding a turbidity modifying agent B through an adding pipe B (18), and carrying out turbidity modifying on the slicing wastewater after pH adjustment to obtain the slicing wastewater after turbidity modifying;

step 2, pumping the slice wastewater subjected to turbidity tempering into a membrane filter press (3) for primary filtration by using a tempering feed pump (13), controlling the opening degree of a metering pump connected with a feeding pipe B (18) according to the concentration of influent SS to control the feeding amount, opening water nozzle valves of inner grooves on two sides of the membrane filter press (3), discharging the pressure filtrate from the inner grooves to an inner groove converging pipe (24) through an inner groove liquid connecting pipe, and returning the pressure filtrate to a regulating tank (1) through the inner groove converging pipe (24);

step 3, feeding conditioned slice wastewater into a feed inlet (301) of a filter press through a conditioning feed pump (13), tightly arranging filter plates into a row under the action of pressure, forming filter chambers between the filter plates, pressing the wastewater into the filter chambers, wherein solid particles and suspended matters are partially intercepted by filter cloth to form filter cakes, and discharging liquid from the filter chambers as filter pressing liquid; the squeezing port (302) is connected with a tap water system, and after the water of the filter cake is further squeezed, the squeezing water is recycled and discharged into the tap water system; the back flushing port (311) is connected with compressed air to further blow and dehydrate the filter cake, and back flushing liquid is discharged into the regulating tank (1) through the return port (301); after dehydration, removing pressing force of the filter plates, automatically pulling the filter plates one by one, and respectively opening the filter chambers to discharge mud;

step 4, the filter pressing liquid after silicon removal enters an intermediate pool (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, conductivity and flow values of the outer tank turbidimeter (231) and the intermediate tank outlet pipe (27):

wherein: q_RORepresents RO water supply amount, Q_CNIndicates the amount of water supply of the new cutting fluid, Q_CWIndicating the flow of liquid into the dosing unit, K_SThe water loss coefficient of the sludge of the double-tank filter pressing unit is shown, P represents the water content of the filter pressing sludge of the double-tank filter pressing unit, and Q_fIndicates the flow rate of raw water of the slicing wastewater, C_fShowing the concentration of suspended matter in the raw water of the slice wastewater, C_rRepresents the suspended matter concentration of the outer tank pressure filtrate, K_DUIndicates the dilution factor, pH, of the novel cutting fluid₁Indicating the pH of the liquid entering the formulation unit, pH₂Indicates the pH value of the prepared liquid prepared by the preparation unit, E₁Indicating the conductivity of the liquid entering the formulation unit, E₂Indicates the conductivity, T, of the prepared liquid of the preparation unit_b1Denotes the external tank pressure filtrate turbidity, T_b2Showing the turbidity of the prepared liquid prepared by the preparation unit;

obtaining RO water supplement quantity in real time according to a formula (1), adopting secondary RO concentrated water recycled from the water in the wastewater station as make-up water, and obtaining the RO water supplement quantity Q_ROIs controlled by being associated with an RO water replenishing pipe (19) system, and controls the replenishing quantity Q of the new cutting fluid according to a formula (2)_CNOpening the blending tank lift pump (15) and controlling the pumpA back valve, namely opening a return valve (3004) of the blending tank, closing a water inlet valve (3005) of the back filter tank and a bypass valve (3006) of the blending tank, controlling the supplement amount of the new cutting fluid, opening a feeding pipe (20) of the new cutting fluid, closing a return pipeline of the blending tank, opening the water inlet valve of the back filter tank, and obtaining the blending fluid after blending;

and 5, filtering the prepared solution by using a filter tank (7) after blending, discharging the filtered solution into a recycling pool (8) for later use, pumping the recycling water into a UV sterilizer (9) by using a recycling pool lifting pump (16), and flowing the recycling water through a recycling filter tank (10) to a machine station water consumption point (11) for recycling.

10. The recycling method of the slice wastewater resource according to claim 9, characterized in that: the pH modifying agent A is 10-15% of citric acid; the turbidity modifying agent B comprises a solution of silicon-aluminum oxide.