CN214244123U - Industrial wastewater zero discharge treatment system - Google Patents

Abstract

The utility model discloses an industrial waste water zero release processing system, processing system is including the oil interceptor, waste water collecting pit, the triplex case, the air supporting pond, the pH equalizing basin, the pond of hydrolysising, good oxygen pond, produce the water tank, quartz sand filter, activated carbon filter, middle pond, safety filter ware, one-level RO reverse osmosis membrane device, second grade RO reverse osmosis membrane device, DTRO reverse osmosis membrane device, three effect evaporation ware, still include respectively with the air supporting pond, the sludge thickening pond that good oxygen pond is connected, the filter press, this processing system can carry out the advanced treatment to the particulate matter in the waste water, the organic matter homoenergetic, realize waste water "zero" row, the suitability is strong, high treatment efficiency, stable performance, be applicable to the region that the restriction waste water discharged.

Description

Industrial wastewater zero discharge treatment system

Technical Field

The utility model relates to a chemical industry field, concretely relates to industrial waste water zero release processing system.

Background

The zero discharge of the wastewater refers to that after the industrial wastewater is treated, the salt content and pollutants of the wastewater are concentrated into wastewater with high concentration (more than 99 percent) and then are all recycled, and no waste liquid is discharged from a factory. The salts and pollutants in the water are concentrated and crystallized, discharged in a solid form and sent to a landfill of a garbage disposal plant or recovered as useful chemical raw materials.

Zero emission, which is to control the emission of energy and resources that must be generated in the production process to reduce the emission to zero; another meaning is to make full use of the energy and resources that must be discharged, and finally eliminate the existence of non-renewable resources and energy.

At present, the widely used industrial wastewater treatment technology in China mainly comprises RO (reverse osmosis membrane) and an evaporator, wherein the RO (reverse osmosis membrane) is targeted at ions (heavy metal ions) and organic matters with large molecular weight. Its theory of operation is under certain pressure condition, and the hydrone can pass through the RO osmotic membrane, and dissolves the inorganic matter in aquatic, heavy metal ion, macromolecule organic matter, colloid, bacterium and virus then can't pass through the osmotic membrane. So that the permeated pure water can be separated from the waste water containing high concentration of harmful substances. However, only about 60% of pure water can be obtained by this technique, and the remaining wastewater containing high-concentration harmful substances contains heavy metal ions and inorganic substances in high concentration which are extremely harmful to the environment, and the amount of generated concentrated wastewater is large. If the large amount of waste water directly enters the evaporator, the investment cost and the operation cost of the evaporator are greatly increased, and the occupied area of the evaporator is greatly increased. Therefore, reducing the amount of wastewater entering the evaporator is also a major research direction for zero discharge of industrial wastewater.

Disclosure of Invention

For solving the not enough of prior art, the utility model provides a can carry out the advanced treatment to particulate matter, organic matter homoenergetic in the waste water, realize waste water "zero" row, the suitability is strong, and the treatment effeciency is high, and the stable performance is applicable to the regional industrial waste water zero release processing system of restriction wastewater discharge.

In order to achieve the above object, the utility model adopts the following technical scheme: the industrial wastewater zero-discharge treatment system is characterized by comprising an oil separation tank, a wastewater collection tank, a triple box, an air flotation tank, a pH regulation tank, a hydrolysis tank, an aerobic tank, a water production tank, a quartz sand filter, an activated carbon filter, a middle water tank, a security filter, a primary RO reverse osmosis membrane device, a secondary RO reverse osmosis membrane device, a DTRO reverse osmosis membrane device and a triple-effect evaporator which are sequentially connected, and further comprising a sludge concentration tank and a plate-and-frame filter press which are respectively connected with the air flotation tank and the aerobic tank; waste water in a workshop is discharged into an oil separation tank, an outlet of the oil separation tank is connected with a waste water collecting tank, an outlet of the waste water collecting tank is connected into a triple box, alkali, PAC and PAM are respectively added into the triple box, an outlet of the triple box is connected into an air flotation tank, an outlet of the air flotation tank is connected into a pH adjusting tank, an outlet of the pH adjusting tank is connected into a hydrolysis tank to complete hydrolysis and acidification, the aerobic tank with an MBR membrane is connected into a water production tank, the aerobic tank is then respectively filtered by a quartz sand filter and an active carbon filter, the middle water tank and a security filter are connected, produced water discharged by the security filter is connected into a first-level RO, produced water of the first-level RO reverse osmosis membrane is connected into the workshop, concentrated solution of the first-level RO reverse osmosis membrane is connected into a second-level RO reverse osmosis membrane device, produced water of the second-level RO reverse osmosis membrane is connected into the workshop, concentrated solution of the second-level RO is connected into a DTRO reverse osmosis membrane device, concentrated solution of the DTRO evaporator, condensate water of the third-level evaporator flows back into the waste water collecting tank for treatment, wherein, the outlets of the air flotation tank and the aerobic tank are respectively connected with a sludge concentration tank and a plate-and-frame filter press, and the filtrate after filter pressing by the plate-and-frame filter press is connected with a wastewater collection tank.

In a specific embodiment, the quartz sand filter and the activated carbon filter are respectively connected with the wastewater collection tank, and backwash water is introduced into the wastewater collection tank after the quartz sand filter and the activated carbon filter are subjected to backwashing.

In a specific embodiment, the DTRO reverse osmosis membrane is a disk-and-tube reverse osmosis membrane.

In one particular embodiment, the triple effect evaporator comprises three evaporators connected together in series.

In a specific embodiment, the treatment system further comprises a sludge collection device for collecting the sludge treated by the sludge concentration tank and the plate-and-frame filter press.

In a specific embodiment, the treatment system further comprises a residue collection device for collecting the residue after treatment by the DTRO reverse osmosis membrane device.

In a specific embodiment, the treatment system further comprises a heater, a forced circulation pump and a separator, wherein feed liquid in the heater circulates in the heater through the forced circulation pump, the feed liquid flows at a high speed in the heater to slow down scaling of a pipe wall, the feed liquid and heating steam of the heater continuously exchange heat and evaporate in the flowing process, the feed liquid enters the separator, the feed liquid and secondary steam are subjected to flash evaporation in the separator to perform gas-liquid separation, and concentrated liquid obtained by separation reaches a set concentration and is output by a discharge valve.

In a specific embodiment, the treatment system further comprises a concentration meter, and the concentration of the concentrated solution is controlled through the concentration meter.

In a specific embodiment, the processing system comprises a monitoring device, a control device and an alarm device.

In a specific embodiment, the DTRO reverse osmosis membrane is an integrated DTRO plant.

The utility model provides an industrial waste water zero release processing system, through including the air supporting pond, the pond of hydrolysising, the good oxygen pond that contains the MBR membrane, one-level RO reverse osmosis membrane device, second grade RO reverse osmosis membrane device, DTRO reverse osmosis membrane device, the cooperation function of triple effect evaporimeter etc. can carry out the advanced treatment to particulate matter, organic matter homoenergetic in the waste water, realize waste water "zero" row, the suitability is strong, the treatment effeciency is high, the stable performance is applicable to the region of restriction waste water discharge.

Drawings

FIG. 1 is a process flow diagram of the industrial wastewater zero-discharge treatment system of the utility model.

Detailed Description

The preferred embodiments of the high power laser automatic coupling device and method of the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the utility model provides a preferred embodiment, an industrial waste water zero release processing system, this processing system is including the oil interceptor, the waste water collecting pit, the triplex case, the air supporting pond, the pH equalizing basin, the pond of hydrolysising, good oxygen pond, produce the water tank, quartz sand filter, activated carbon filter, middle pond, safety filter ware, one-level RO reverse osmosis membrane device, second grade RO reverse osmosis membrane device, DTRO reverse osmosis membrane device and the triple effect evaporimeter that connect gradually, still include the concentrated pond of mud, the frame filter press of being connected with air supporting pond, good oxygen pond respectively.

When the treatment system normally operates, waste water in a workshop is discharged into an oil separation tank for oil separation, an outlet of the oil separation tank is connected with a waste water collection tank, an outlet of the waste water collection tank is connected into a triple box, a dosing pump is arranged on the triple box, alkali, PAC (polyaluminium chloride), PAM (polyacrylamide) are respectively added into the triple box through the dosing pump to generate alumen ustum, an outlet of the triple box is connected into an air flotation tank, the alumen ustum is removed from the air flotation tank, and effluent enters a rear biochemical reaction system after the air flotation treatment method. In this embodiment, the air flotation treatment process in the air flotation tank is to introduce air into the wastewater and separate out the wastewater in the form of micro bubbles to become a carrier, so that the pollutant substances such as emulsified oil, micro suspended particles and the like in the wastewater are adhered to the bubbles and float to the water surface along with the bubbles to form a three-phase mixture of foam gas, water and particles (oil), and the purpose of separating impurities and purifying the wastewater is achieved by collecting the foam or scum. The main function of the air floatation tank is to treat oil which is difficult to remove by natural sedimentation or floating or tiny suspended particles with the relative density close to 1 in the wastewater. The outlet of the air floatation tank is connected to a pH adjusting tank, acid or alkali is added into the pH adjusting tank to adjust the pH value, the outlet of the pH adjusting tank is connected to a hydrolysis tank to complete two processes of hydrolysis and acidification, the outlet of the hydrolysis tank is connected to an aerobic tank added with an MBR membrane, acidified wastewater enters the aerobic tank, organic matters can be further removed, nitrogen and phosphorus removal is carried out, the wastewater is connected to a water production tank to produce water, and then is filtered by a quartz sand filter and an active carbon filter respectively to remove suspended matters, a small amount of organic matters and the like, the wastewater is connected to a later reverse osmosis system, the produced water is filtered by the active carbon filter and is connected to an intermediate water tank and a security filter, particulate matters are further removed, and each later reverse osmosis membrane device is protected.

As shown in figure 1, the discharged produced water of the security filter is connected with a first-level RO reverse osmosis membrane device, the produced water of the first-level RO reverse osmosis membrane is connected with a workshop, the concentrated solution of the first-level RO reverse osmosis membrane is connected with a second-level RO reverse osmosis membrane device, the produced water of the second-level RO reverse osmosis membrane is also connected with the workshop, the concentrated solution of the second-level RO reverse osmosis membrane is connected with a DTRO reverse osmosis membrane device, the concentrated solution of the DTRO reverse osmosis membrane is connected with a triple-effect evaporator, the condensed water of the triple-effect evaporator flows back to a waste water collecting pool for treatment, and the residue of the triple-effect evaporator enters a residue collecting device for subsequent residue treatment.

Wherein, the outlets of the air flotation tank and the aerobic tank are respectively connected with the sludge concentration tank and the plate-and-frame filter press, and the outlet of the plate-and-frame filter press is connected with the wastewater collection tank. And the sludge in the air flotation tank and the sludge in the aerobic tank respectively enter a sludge concentration tank, then respectively enter a plate-and-frame filter press for filter pressing, filtrate returns to a wastewater collection tank, and the sludge treated by the sludge concentration tank and the plate-and-frame filter press enters a sludge collection device for subsequent treatment.

In this embodiment, the quartz sand filter and the activated carbon filter are further connected to the wastewater collection tank, and after the quartz sand filter and the activated carbon filter operate for a period of time, backwashing is required to ensure non-clogging, and generated backwashing water returns to the wastewater collection tank for further subsequent treatment.

In this embodiment, reverse osmosis is also called reverse osmosis, which is a membrane separation operation that separates a solvent from a solution using a pressure difference as a driving force. The feed solution on one side of the membrane is pressurized and when the pressure exceeds its osmotic pressure, the solvent will reverse osmosis against the direction of natural osmosis. Thereby obtaining a permeated solvent, i.e., permeate, at the low pressure side of the membrane; the high pressure side results in a concentrated solution, i.e., a dope as described above.

The DTRO is a disc tube type reverse osmosis membrane, the DTRO process is based on the process application of the disc tube type reverse osmosis membrane, the core technology of the DTRO lies in the unique structural form of the disc tube type reverse osmosis membrane, and the DTRO has the characteristics of investment saving, high automatic control degree, simple and convenient operation and maintenance, low operating cost and stable and continuous emission requirement meeting.

The purpose of the triple-effect evaporator in the above embodiment, which includes three evaporators connected in series, is to make the steam heat energy be utilized in a colorful way, so as to effectively provide the heat energy effect thereof. Generally, the first evaporator is heated by the generated steam to form steam, and the second evaporator and the third evaporator simultaneously use the steam of the previous evaporator as heating steam. This can greatly reduce the amount of generator used, thereby improving its energy efficiency.

The treatment system also comprises a heater, a forced circulation pump and a separator, wherein feed liquid in the heater circulates in the heater through the forced circulation pump, the feed liquid flows at a high speed in the heater to slow down the scaling of the pipe wall, the feed liquid and heating steam of the heater continuously exchange heat and evaporate in the flowing process, the feed liquid enters the separator, the feed liquid and secondary steam are subjected to flash evaporation in the separator to carry out gas-liquid separation, and concentrated solution obtained by separation reaches a set concentration and is output by a discharge valve. Wherein, the system also comprises a concentration meter, and the concentration of the concentrated solution is controlled by the concentration meter. For example, a time controller is also included, by which the output of the concentrate is controlled.

The embodiment of the utility model provides an in waste water zero release processing system can effectively and the efficient realize the zero release of waste water, and the simple structure of this system, the technological stability is strong, maintain simple, the energy consumption is low, and degree of automation is high.

1. The air floatation tank in the embodiment can be used for treating oil which is difficult to remove by natural sedimentation or floating or tiny suspended particles with the relative density close to 1 in wastewater.

2. The anaerobic tank (digestion tank) adopted in the embodiment has the following advantages compared with the anaerobic tank (digestion tank) in the whole process:

a. does not need a closed pool, a stirrer or a water, gas and solid separator, and reduces the manufacturing cost.

Convenient maintenance and can design structures suitable for large, medium and small sewage plants.

b. The products in the hydrolysis and acid production stages are mainly micromolecular organic matters with generally good biodegradability, so that the biodegradability of the original sewage can be changed by the hydrolysis tank, and the reaction time and the energy consumption for treatment are reduced.

c. Because the reaction is controlled before the second stage is finished, the effluent has no bad smell of anaerobic fermentation, and the environment of the treatment plant is improved.

d. The first stage and the second stage react quickly, so the hydrolysis tank has small volume which is basically equivalent to the primary sedimentation tank, and the capital investment is saved; the hydrolysis tank degrades solid organic matters, so that the sludge amount is reduced, and the hydrolysis tank has the function of a digestion tank.

e. The process only generates little residual activated sludge, realizes the one-time treatment of sewage and sludge, and does not need a mesophilic digestion tank.

3. In the embodiment, an aerobic tank added with an MBR membrane is adopted, the MBR is the high-efficiency combination of a membrane separation technology and a biological treatment method, and the origin is to replace a secondary sedimentation tank in an activated sludge method by the membrane separation technology to carry out solid-liquid separation. The process not only effectively achieves the purpose of mud-water separation, but also has the advantages that the traditional process for secondary sewage treatment is incomparable:

a. the solid-liquid separation is carried out efficiently, the separation effect is far better than that of the traditional sedimentation tank, the effluent quality is good, the effluent suspended matter and turbidity are close to zero, the effluent can be directly recycled, and the sewage recycling is realized.

b. The high-efficiency interception function of the membrane ensures that microorganisms are completely intercepted in the bioreactor, the complete separation of the Hydraulic Retention Time (HRT) and the sludge age (SRT) of the bioreactor is realized, and the operation control is flexible and stable.

c. The MBR integrates the aeration tank and the secondary sedimentation tank of the traditional sewage treatment and replaces all process facilities of the three-stage treatment, so that the occupied area can be greatly reduced, and the civil engineering investment is saved.

d. The method is beneficial to the interception and reproduction of nitrifying bacteria, the system has high nitrification efficiency, and can also have the functions of deamination and dephosphorization by changing the operation mode.

e. The mud age can be very long, so that the degradation efficiency of the refractory organic matters is greatly improved.

f. The reactor operates under high volume load, low sludge load and long sludge age, the output of the excess sludge is extremely low, and zero sludge discharge can be realized theoretically because the sludge age can be infinitely long.

g. The system realizes PLC control and is convenient to operate and manage.

4. The reverse osmosis membrane devices adopted in the embodiment can intercept various inorganic ions, colloidal substances and macromolecular solutes in water, thereby obtaining purified water. The membrane desalination rate is more than or equal to 95-99% (under the condition of 6000PPM NaCl solution fed in)

5. The DTRO reverse osmosis membrane device adopted in the embodiment has the following advantages:

a. the effluent quality is good

The reverse osmosis membrane has extremely high removal rate on various pollutants, has good effluent quality, is mainly applied to single-stage (after being connected in series to biochemical effluent) and two-stage DTRO at present, and can completely meet the requirements of the standard in table 2 or table 3 of the control standard of domestic garbage landfill pollution (GB 16889-2008).

b. Strong process stability, simple maintenance and low energy consumption

Because the factors influencing the retention rate of the membrane system are few, the effluent quality of the system is very stable and is not influenced by factors such as biodegradability, carbon-nitrogen ratio and the like; the DT assembly adopted in the process adopts a standardized design, the assembly is easy to disassemble and maintain, any filter membrane and other components can be easily inspected and maintained by opening the DT assembly, the maintenance is simple, and when the number of the components is not enough, the assembly allows a few membranes and flow guide discs to be installed, so that the use of the DT assembly is not influenced.

The DT membrane component effectively avoids the scaling of the membrane, reduces the membrane pollution and prolongs the service life of the reverse osmosis membrane. Due to the special structure and the hydraulic design of the DT, the membrane module is easy to clean, and the flux recovery performance after cleaning is very good, so that the service life of the membrane is prolonged. The practical engineering shows that in the treatment of the seepage stock solution, the service life of the first-grade DT membrane can be as long as 3 years, even longer, and the service life of the first-grade DT membrane can be more than 5 years after the first-grade DT membrane is connected with other treatment facilities (such as MBR), which cannot be achieved by a common reverse osmosis treatment system.

In the process, the final removal of pollutants is not required to be realized, and only the separation effect is realized, so the operation energy consumption is greatly reduced; any individual component within the DT assembly allows for individual replacement. The filtering part is formed by assembling a plurality of filtering membranes and a flow guide disc, when the filtering membranes need to be replaced, the filtering membranes can be replaced singly, the membranes with good filtering performance can still be used continuously, and the membrane replacing cost is reduced by the maximum procedure.

c. Flexible operation

The DTRO system is used as a set of physical separation equipment, is flexible to operate, can run continuously or intermittently, and can adjust the series-parallel connection mode of the system to adapt to the requirements of water quality and water quantity.

d. Short construction period, rapid debugging and starting

The core components of the DTRO process are assembled in a factory, and are built by matching a factory building and a water pool, so that the scale is small, and the building speed is high. The installation and debugging work can be completed only in about two weeks after the equipment is transported to the site.

e. High automation degree and simple operation

This effluent disposal system is full automatic, and entire system is equipped with perfect monitoring devices, controlling means and alarm device, and PLC controlling means can be according to sensor parameter automatically regulated, and when monitoring devices found unusually, control alarm device sent alarm signal in good time, forms the protection to entire processing system, and operating personnel only need seek wrong code trouble shooting according to the operation manual, does not have too high requirement to operating personnel's experience.

f. Small floor area

The core equipment of the DTRO process is installed in an integrated mode, and the attached structures and facilities are small structures, so that the occupied area is small.

g. Can be recycled

The core component of the DTRO process is DTRO integrated equipment, the movement and the installation are simple and convenient, the service life of the whole equipment is more than 20 years, and after one project is finished, the DTRO process can be moved to other projects for continuous use.

6. The triple-effect evaporator adopted in the embodiment has the effects that the evaporated secondary steam is used as a heat source of the preheater, so that raw materials can be heated, and meanwhile, the secondary steam is cooled, so that the consumption of steam is reduced, and the consumption of cooling water is reduced. And a triple-effect evaporation mode is adopted, so that the consumption of steam is greatly reduced.

Although the present invention has been described with reference to the embodiments, the embodiments are not intended to limit the present invention. Various changes and modifications may be made by one skilled in the art within the spirit of the invention and the appended claims are intended to cover such changes and modifications.

Claims (10)

1. The industrial wastewater zero-discharge treatment system is characterized by comprising an oil separation tank, a wastewater collection tank, a triple box, an air flotation tank, a pH adjusting tank, a hydrolysis tank, an aerobic tank, a water production tank, a quartz sand filter, an activated carbon filter, a middle water tank, a security filter, a primary RO reverse osmosis membrane device, a secondary RO reverse osmosis membrane device, a DTRO reverse osmosis membrane device and a triple-effect evaporator which are sequentially connected, and further comprising a sludge concentration tank and a plate-and-frame filter press which are respectively connected with the air flotation tank and the aerobic tank;

waste water in a workshop is discharged into an oil separation tank, an outlet of the oil separation tank is connected with a waste water collecting tank, an outlet of the waste water collecting tank is connected into a triple box, alkali, PAC and PAM are respectively added into the triple box, an outlet of the triple box is connected into an air flotation tank, an outlet of the air flotation tank is connected into a pH adjusting tank, an outlet of the pH adjusting tank is connected into a hydrolysis tank to complete hydrolysis and acidification, the aerobic tank with an MBR membrane is connected into a water production tank, the aerobic tank is then respectively filtered by a quartz sand filter and an active carbon filter, the middle water tank and a security filter are connected, produced water discharged by the security filter is connected into a first-level RO, produced water of the first-level RO reverse osmosis membrane is connected into the workshop, concentrated solution of the first-level RO reverse osmosis membrane is connected into a second-level RO reverse osmosis membrane device, produced water of the second-level RO reverse osmosis membrane is connected into the workshop, concentrated solution of the second-level RO is connected into a DTRO reverse osmosis membrane device, concentrated solution of the DTRO evaporator, condensate water of the third-level evaporator flows back into the waste water collecting tank for treatment, wherein, the outlets of the air flotation tank and the aerobic tank are respectively connected with a sludge concentration tank and a plate-and-frame filter press, and the filtrate after filter pressing by the plate-and-frame filter press is connected with a wastewater collection tank.

2. The industrial wastewater zero-discharge treatment system according to claim 1, wherein the quartz sand filter and the activated carbon filter are respectively connected with the wastewater collection tank, and after back washing, the quartz sand filter and the activated carbon filter are connected with the wastewater collection tank through back washing water.

3. The industrial wastewater zero-discharge treatment system of claim 1, wherein the DTRO reverse osmosis membrane is a disc tube reverse osmosis membrane.

4. The industrial wastewater zero-emission treatment system of claim 1, wherein the triple-effect evaporator comprises three evaporators connected together in series.

5. The industrial wastewater zero-discharge treatment system of claim 1, further comprising a sludge collection device for collecting sludge treated by the sludge concentration tank and the plate and frame filter press.

6. The industrial wastewater zero-discharge treatment system of claim 1, further comprising a residue collection device for collecting the residue after treatment by the DTRO reverse osmosis membrane device.

7. The industrial wastewater zero-discharge treatment system of claim 1, further comprising a heater, a forced circulation pump, and a separator.

8. The industrial wastewater zero-discharge treatment system according to claim 7, further comprising a concentration meter, wherein the concentration of the concentrated solution is controlled by the concentration meter.

9. The industrial wastewater zero-discharge treatment system according to claim 1, characterized in that the treatment system comprises a monitoring device, a control device and an alarm device.

10. The industrial wastewater zero discharge treatment system of claim 1, wherein the DTRO reverse osmosis membrane is an integrated DTRO device.

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