CN214990911U - Acid phase method chlorinated polyethylene waste water treatment system - Google Patents
Acid phase method chlorinated polyethylene waste water treatment system Download PDFInfo
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- CN214990911U CN214990911U CN202120244300.XU CN202120244300U CN214990911U CN 214990911 U CN214990911 U CN 214990911U CN 202120244300 U CN202120244300 U CN 202120244300U CN 214990911 U CN214990911 U CN 214990911U
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Abstract
The utility model discloses an acid phase method chlorinated polyethylene waste water treatment system, it is including the reacting tank, cross-flow filter, play water hold up tank, dish tubular reverse osmosis equipment and the evaporation equipment that link together in proper order, and acid waste water gets into cross-flow filter after the reaction with going on in the reacting tank, cross-flow filter's dense water export and play water hold up tankThe outlet water storage tank is connected with a wastewater inlet of the disc tube type reverse osmosis device, and a concentrated water outlet of the cross flow filter and a concentrated solution outlet of the disc tube type reverse osmosis device are both connected with a wastewater inlet of the evaporation device. The utility model discloses an adopt neutralization, cross-flow filtration, dish tubular reverse osmosis membrane separation, evaporative concentration's technology to handle acid phase method chlorinated polyethylene waste water, make acid phase chlorinated polyethylene waste water treatment up to standard, realize waste water resource utilization. The utility model discloses a water treatment is effectual, does not need the flocculating agent during processing, and is particularly suitable for handling Cl‑High content chlorinated polyethylene production wastewater.
Description
Technical Field
The utility model relates to a waste water treatment technical field, concretely relates to acid phase method chlorinated polyethylene waste water treatment system.
Background
Chlorinated Polyethylene (CPE) is a high-molecular chloride generated after partial hydrogen atoms in polyethylene molecules are replaced by chlorine, and can be divided into light plastics, elastic plastics, rubber elastomers, semi-elastic leather-like polymers, highly chlorinated polyethylene and the like according to the chlorine content in the molecules from low to high, so that the chlorinated polyethylene has excellent cold resistance, aging resistance, ozone resistance, oil resistance and flame resistance, and has wide development and utilization prospects.
China is the first major chlorinated polyethylene production and export country in the world, and according to statistics of CPE main production enterprises and production conditions in 2017, the conventional chlorinated polyethylene production process mostly adopts a water phase suspension method, HDPE is suspended and chlorinated in a water phase, HCl generated by reaction is removed by water, and the amount of wastewater is large; few adopt hydrochloric acid phase suspension method, in 20% hydrochloric acid medium HDPE suspension chlorination, adopt the rotary table flat filter to deacidify, wash, the material does not need to neutralize direct drying, discharge the acid gas and absorb with alkali, hydrochloric acid phase suspension method is the most advanced production method in the world at present, the flow is short, the product quality is stable, and the waste water discharge is reduced to the minimum, will be the development trend of chlorinated polyethylene production technology.
According to the current literature and patent search, researchers have recycled (strong and small; example of recycling waste water from chlorinated polyethylene production) and treated (diverse and so on) waste water from aqueous phase chlorinated polyethylene productionA method for treating waste water of chlorinated polyethylene suspended in water phase (CN 101607773) is a physicochemical pretreatment and biochemical treatment method. The water phase method chlorinated polyethylene production wastewater treatment process generally comprises the following steps: firstly, lime milk is used for neutralizing process wastewater, effluent after neutralization is subjected to multistage flocculation and precipitation by using a flocculating agent, the effluent enters a clear water tank, and flocculation and precipitation suspended matters separated by precipitates at all stages are collected into a drying tank for subsequent treatment. But the acid phase method chlorinated polyethylene production process adopts HCl as a medium and Cl in wastewater-The content is far higher than that of the water phase method, the water phase method chlorinated polyethylene production wastewater treatment method cannot treat the acid phase method chlorinated polyethylene production wastewater, and the prior art also lacks a related process method for treating the acid phase method chlorinated polyethylene production wastewater and a process method for treating or recycling the chlorinated polyethylene wastewater.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an acid phase method chlorinated polyethylene waste water treatment system is applicable to and handles Cl-High content chlorinated polyethylene production wastewater.
The utility model adopts the following technical scheme: the acid phase chlorinated polyethylene production wastewater treatment system comprises a reaction tank, a cross-flow filter, a water outlet storage tank, a disc tube type reverse osmosis device and an evaporation device which are sequentially connected together, wherein acid wastewater enters the cross-flow filter after undergoing a neutralization reaction in the reaction tank, a concentrated water outlet of the cross-flow filter is connected with the water outlet storage tank, the water outlet storage tank is connected with a wastewater inlet of the disc tube type reverse osmosis device, and a concentrated water outlet of the cross-flow filter and a concentrated solution outlet of the disc tube type reverse osmosis device are both connected with a wastewater inlet of the evaporation device.
The cross flow filter comprises a shell and ceramic membrane filter pipes arranged in the shell at intervals, wherein a waste water inlet and a clear water outlet are respectively formed in two sides of each ceramic membrane filter pipe on the shell, a water distribution disc is arranged at one end, close to the waste water inlet, of each ceramic membrane filter pipe, the outer edge of each water distribution disc is hermetically installed on the inner wall of the shell, a supporting hole used for supporting each ceramic membrane filter pipe is formed in each water distribution disc, a concentrated water header pipe is arranged at one end, close to the clear water outlet, of each ceramic membrane filter pipe, one end of each concentrated water header pipe penetrates out of the shell, the other end of each ceramic membrane filter pipe is a closed end and is located in the shell, one end of each ceramic membrane filter pipe is hermetically installed in the supporting hole, and the other end of each ceramic membrane filter pipe is connected to the concentrated water header pipe in parallel.
And a water inlet distributor is also arranged inside the shell and positioned at the inner side of the waste water inlet.
An intermediate tank for storing neutralized wastewater is arranged behind the reaction tank, and the intermediate tank is connected with a wastewater inlet of the cross-flow filter.
The evaporation equipment adopts an MVR evaporation system.
The disc tube type reverse osmosis equipment is also connected with a clean water tank, and the disc tube type reverse osmosis equipment and a clean water outlet of the evaporation system are connected with the clean water tank through pipelines.
The disc tube type reverse osmosis equipment comprises primary DTRO equipment and secondary DTRO equipment, wherein the concentrated solution outlet of the primary DTRO equipment is connected with the wastewater inlet of the secondary DTRO equipment, and the concentrated solution outlet of the secondary DTRO equipment is connected with the wastewater inlet of the evaporation equipment.
One-level DTRO equipment and second grade DTRO equipment all include central pull rod, diaphragm subassembly and guiding disc spacer sleeve are established on central pull rod, every diaphragm subassembly includes two diaphragms of laminating together from top to bottom and is located the support layer between two diaphragms from top to bottom, central pull rod is hugged closely to the diaphragm subassembly inboard, be equipped with the sealing washer between guiding disc and the central pull rod, the diaphragm is hugged closely respectively to the upper and lower both sides of sealing washer, the guiding disc inboard is hugged closely in the outside of sealing washer, the water purification passageway has between the inboard of sealing washer and the central pull rod.
The utility model has the advantages that: the utility model adopts the processes of neutralization, cross-flow filtration, disc tube type reverse osmosis membrane separation and evaporation concentration to treat the acid phase chlorinated polyethylene production wastewater, because the inner surface of the flow passage in the cross-flow filter is a filter layer with high precision, the flow direction of the fluid is tangent to the filter layer, because the fluid can take away the intercepted substances, no filter cake layer can be formed, the permeability of the cross-flow filter can be stably maintained at a high level for a long time, and the cross-flow filtration effect is good; by means of a disc tubeThe method is characterized in that the method comprises the steps of removing residual organic matters in the wastewater after cross-flow filtration and soluble salt generated after neutralization reaction by using reverse osmosis equipment, and finally evaporating and concentrating the high-salt concentrated solution by using evaporation equipment to separate water and waste solids in the concentrated solution, thereby realizing zero discharge of the wastewater. The utility model discloses a waste water treatment method and system to acid phase suspension method chlorinated polyethylene production technology make acid phase chlorinated polyethylene waste water treatment up to standard, realize waste water resource utilization. The utility model discloses a water treatment is effectual, does not need the flocculating agent during processing, and is particularly suitable for handling Cl-High content chlorinated polyethylene production wastewater.
Drawings
FIG. 1 is a flow chart of a system for treating wastewater from the production of chlorinated polyethylene by an acid phase method according to the present invention;
FIG. 2 is a schematic diagram of a DTRO apparatus in a wastewater treatment system for acid phase chlorinated polyethylene production according to the present invention;
FIG. 3 is a schematic diagram of a cross-flow filter in a wastewater treatment system for acid phase chlorinated polyethylene production.
In the figure: 1-reaction tank, 101-stirrer, 2-intermediate tank, 3-intermediate tank lift pump, 4-cross flow filter, 41-shell, 41 a-wastewater inlet, 41 b-clear water outlet, 42-water distribution plate, 43-ceramic membrane filter tube, 44-concentrated water main pipe, 45-water inlet distributor, 401-central pull rod, 402-diversion plate, 403-membrane, 404-bracket, 405-sealing ring, 5-water outlet storage tank, 6-first-stage DTRO booster pump, 7-first-stage DTRO equipment, 8-clear water tank, 9-reuse water pump, 10-concentrated water tank, 11-second-stage DTRO booster pump, 12-second-stage DTRO equipment and 13-evaporation equipment.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The utility model relates to an implementation of acid phase method chlorinated polyethylene waste water treatment system of embodiment is shown in figure 1, the acid phase method chlorinated polyethylene waste water treatment system of embodiment is including the reaction tank 1 that links gradually together, cross flow filter 4, go out water hold up tank 5, dish tubular reverse osmosis equipment and evaporation equipment 13, be equipped with agitator 101 in the reaction tank 1, acid waste water gets into cross flow filter 4 after reaction in reaction tank 1 carries out the neutralization, cross flow filter 4's dense water export and play water hold up tank 5 are connected, go out water hold up tank 5 and dish tubular reverse osmosis equipment's waste water access connection, cross flow filter's dense water export and dish tubular reverse osmosis equipment's concentrated solution export all with evaporation equipment 13's waste water access connection.
An intermediate tank 2 for storing neutralized wastewater is arranged behind the reaction tank 1, the intermediate tank 2 is connected with a wastewater inlet of the cross-flow filter 4, and the wastewater in the intermediate tank 2 is lifted to the cross-flow filter 4 through an intermediate tank lifting pump 3. The evaporation equipment 13 adopts an MVR evaporation system. The disc tube type reverse osmosis equipment is also connected with a clean water tank 8, and the disc tube type reverse osmosis equipment and a clean liquid outlet of the evaporation system 13 are both connected with the clean water tank 8 through pipelines.
The structure of the cross-flow filter is shown in fig. 3, the cross-flow filter comprises a housing and ceramic membrane filter pipes 43 arranged in the housing 41 at intervals, a wastewater inlet 41a and a clear water outlet 41b are respectively arranged on two sides of the ceramic membrane filter pipes 43 on the housing, a water distribution tray 42 is arranged at one end of each ceramic membrane filter pipe 43 close to the wastewater inlet 41a, the outer edge of the water distribution tray 42 is hermetically installed on the inner wall of the housing 41, a support hole for supporting the ceramic membrane filter pipe 43 is formed in the water distribution tray 42, a concentrated water header pipe 44 is arranged at one end of each ceramic membrane filter pipe 43 close to the clear water outlet 41b, one end of the concentrated water header pipe 44 penetrates out of the housing 1, the other end of each ceramic membrane filter pipe 43 is a closed end and is located in the housing 1, the uniform end of each ceramic membrane filter pipe 43 is hermetically installed in the support hole, and the other end of each ceramic membrane filter pipe is connected in parallel to the concentrated water header pipe 44. A water inlet distributor 45 is further provided inside the waste water inlet 41a in the housing 41. The wastewater after neutralization reaction enters the shell of the cross-flow filter through a wastewater inlet, is subjected to primary water inlet distribution through a water inlet distributor, is subjected to secondary redistribution through a water distribution disc, enters the ceramic membrane filter tube, flows along the tangential direction of the inner wall of the ceramic membrane filter tube, intercepts suspended matters under the action of pressure, and flows out along the direction vertical to the tube wall, and is discharged through a clear water outlet at the other side of the shell to enter a water outlet storage tank; the concentrated water is retained in the ceramic filter tube and is discharged into evaporation equipment after being collected by a concentrated water manifold.
The dish tubular reverse osmosis equipment includes one-level DTRO equipment 7 and second grade DTRO equipment 12 in this embodiment, and the concentrate export of one-level DTRO equipment 7 is connected with the waste water inlet of second grade DTRO equipment 12, is connected with the concentrate groove between the concentrate export of one-level DTRO equipment 7 and the waste water inlet of second grade DTRO equipment 12, and the concentrate export of second grade DTRO equipment 12 is connected with the waste water inlet of evaporating equipment 13. Waste water in the water outlet storage tank is lifted to a waste water inlet of the primary DTRO device 7 through the primary DTRO booster pump 6, a concentrated solution outlet of the primary DTRO device 7 is connected with a concentrated solution tank 10, and concentrated solution in the concentrated solution tank 10 is lifted to a waste water inlet of the secondary DTRO device 12 through the secondary DTRO booster pump 11.
One-level DTRO equipment 7 and second grade DTRO equipment 12 all include central pull rod 401, diaphragm subassembly and guiding disc 402 spacer sleeve are established on central pull rod 1, every diaphragm subassembly includes two diaphragms 403 that the laminating is in the same place from top to bottom and is located the support layer 404 between two upper and lower diaphragms 402, central pull rod 401 is hugged closely to the diaphragm subassembly inboard, be equipped with sealing washer 405 between guiding disc 402 and the central pull rod 401, diaphragm 403 is hugged closely respectively to the upper and lower both sides of sealing washer 405, guiding disc 401 is inboard is hugged closely to the outside of sealing washer 405, the water purification passageway has between the inboard of sealing washer 405 and the central pull rod 401.
The structure of the DTRO equipment is shown in figure 2, the DTRO equipment consists of a membrane assembly, a flow guide disc 402, a sealing ring 405, a central pull rod 401 and a pressure-resistant sleeve, the membrane assembly and the flow guide disc are stacked at intervals, the sealing ring 405 is an O-shaped rubber ring, the O-shaped rubber ring is arranged in grooves on two sides of the flow guide disc 402, the central pull rod 401 penetrates together and is arranged in the pressure-resistant sleeve, and two ends of the pressure-resistant sleeve are sealed by metal end plates (not shown in the figure) to form a disc-tube type membrane assembly. Each membrane module consists of two concentric octagonal reverse osmosis membranes, and a filamentous scaffold layer 404 is sandwiched between the two membranes 403, so that purified water passing through the membranes 403 can rapidly flow to an outlet. The outer ring of the three layers of octagonal materials is welded by ultrasonic technology, and the inner ring is opened and is a purified water outlet. The O-shaped rubber ring prevents raw water from entering the permeate channel. The flow guide plate 402 is supported by the convex points, so that the feed liquid forms a turbulent flow state in the filtering process, and the phenomena of scaling, pollution and concentration polarization on the surface of the membrane are reduced.
The liquid to be treated rapidly passes through the filter membrane in the shortest distance, then reverses to the other membrane surface at 180 degrees, and then flows to the next membrane surface to form tangential filtration from the periphery of the diversion disc to the circle center and then to the periphery. The flow of percolate in the DTRO plant is indicated by the dashed arrow and the flow of clean water is indicated by the solid arrow.
And the clean water tank collects the produced water of the first-stage DTRO equipment and the second-stage DTRO equipment, and the produced water is discharged after reaching the standard or reused as the produced water in a factory.
The evaporation equipment adopts an MVR process to evaporate and concentrate the DTRO high-salt concentrated water, so that zero discharge of wastewater is realized.
The utility model discloses an operation step of acid phase method chlorinated polyethylene waste water treatment system is as follows:
(1) neutralizing: discharging the acidic wastewater into a neutralization tank, adding a NaOH solution with the mass fraction of 32% into the neutralization tank to neutralize the acidic wastewater into neutral wastewater, and temporarily storing the neutralized wastewater in an intermediate tank.
(2) Cross-flow filtration: the wastewater is introduced into the cross-flow filter from the middle tank, suspended matters in the neutralized wastewater are removed by the cross-flow filter, the wastewater enters the cross-flow filter, the flow direction of the wastewater is tangent to a filter membrane of the cross-flow filter, and the suspended matters in the wastewater are intercepted by the filter membrane. The cross-flow element adopted by the cross-flow filtration is used for removing suspended matters in wastewater by adopting a surface layer filtration principle, the flow direction of fluid is tangential to the filter membrane, the fluid flows through the inner surface of the tubular flow channel of the element at a large Reynolds number and is not easy to block, the inner surface of the flow channel is a filter layer (0.04 micron) with high precision, and because the fluid can take away the intercepted substances, a filter cake layer cannot be formed, and the permeability can be stably maintained at a high level for a long time.
(3) Membrane separation: treating the concentrated water after cross-flow filtration by using a disc-tube type reverse osmosis device, wherein the wastewater enters the disc-tube type reverse osmosis device and enters a membrane under the flow guide effect of a flow guide disc, residual organic matters in the wastewater and soluble salt generated after neutralization reaction are removed, the formed clear liquid is discharged from a pure water outlet of the disc-tube type reverse osmosis device, and concentrated solution containing organic matters and salt is discharged from a concentrated solution outlet; the method comprises the following steps of separating by adopting a two-stage membrane, wherein the disc tube type reverse osmosis equipment comprises first-stage DTRO equipment and second-stage DTRO equipment, concentrated solution generated by the first-stage DTRO equipment is sent into the second-stage DTRO equipment for secondary desalination, and concentrated solution generated by the second-stage DTRO equipment enters evaporation equipment.
The first-stage DTRO equipment is used for removing residual organic matters in the wastewater and soluble salt generated after neutralization reaction, most of organic matters, salt and the like in raw water are enriched in concentrated solution separated by the first-stage DTRO equipment, and the concentrated solution separated by the first-stage DTRO equipment is sent into a concentrated water tank and then sent into a second-stage DTRO equipment for secondary desalination. The DTRO equipment adopts full-automatic control, and carries out filtration water production, dosing, shutdown flushing and online CIP cleaning according to programs. And the secondary DTRO equipment receives the concentrated solution of the primary DTRO equipment for secondary desalination, the clear liquid automatically flows into the clear water tank, and the concentrated solution of the secondary DTRO equipment enters the next step of evaporation concentration.
(4) And (3) evaporation and concentration: and (3) the concentrated solution discharged in the cross-flow filtration and membrane separation steps enters evaporation equipment, the evaporation equipment adopts an MVR evaporation system, and the evaporation equipment is used for carrying out evaporation concentration on the high-salt concentrated solution, so that water and waste solids in the concentrated solution are separated out, and zero discharge of wastewater is realized. The solid that the evaporation system separated carries out useless solid processing, and the clear liquid that forms through the disc tube formula reverse osmosis unit and the clear liquid that evaporation equipment formed all send into the clear water jar, and the clear liquid that permeates through of one-level DTRO equipment and second grade DTRO equipment naturally flows into the clear water jar in this embodiment.
The following description of the present invention is made with reference to specific application examples:
(1) the wastewater with the water amount of 1250t/d mainly comprises COD (56.26 mg/L) and HCl (0.305%), and firstly enters a reaction tank; (2) then adding 32% NaOH into the reaction tank to adjust the wastewater to be neutral, generating NaCl with the concentration of 4900mg/L, and feeding the generated NaCl into an intermediate tank; (3) after being stored in the middle tank, the wastewater is lifted to the cross flow filter by a lifting pump of the middle tank, the water recovery rate of the cross flow filter is 98.40 percent, the COD removal rate is 40 percent, the effluent water amount is 1230t/d, the COD content is 34mg/L, and the wastewater enters a first-stage DTRO device; (4) the water recovery rate of the first-stage DTRO equipment is 70 percent, the desalination rate is 97 percent, the yield of clear water is 861t/d, the NaCl concentration is 220mg/L, the COD concentration is 1.54mg/L, and the wastewater reaches the standard and is discharged or recycled; the yield of the primary DTRO concentrated water is 369t/d, the NaCl concentration is 15800mg/L, and the COD concentration is 108.9mg/L, the primary DTRO concentrated water enters a concentrated water tank and is conveyed to a secondary DTRO device through a lifting pump for secondary desalination; (5) the water recovery rate of the secondary DTRO equipment is 83 percent, the desalination rate is 90 percent, the yield of clear water is 306.3t/d, the NaCl concentration is 1600mg/L, the COD concentration is 10.89mg/L, the secondary DTRO equipment is mixed with primary DTRO clear water and then discharged or recycled, the yield of secondary DTRO concentrated water is 62.7t/d, the NaCl concentration is 83400mg/L, and the COD concentration is 576.59 mg/L. (6) The second-stage DTRO concentrated water enters an MVR evaporation concentration system, and 9.7t/d of waste residue containing 70% NaCl solid is generated through the MVR evaporation concentration system.
The utility model adopts the processes of neutralization, cross-flow filtration, disc tube type reverse osmosis membrane separation and evaporation concentration to treat the acid phase chlorinated polyethylene production wastewater, because the inner surface of the flow passage in the cross-flow filter is a filter layer with high precision, the flow direction of the fluid is tangent to the filter layer, because the fluid can take away the intercepted substances, no filter cake layer can be formed, the permeability of the cross-flow filter can be stably maintained at a high level for a long time, and the cross-flow filtration effect is good; and finally, evaporating and concentrating the high-salt concentrated solution by adopting evaporation equipment to separate water and waste solids in the concentrated solution, thereby realizing zero discharge of the waste water. The utility model discloses a waste water treatment method and system to acid phase suspension method chlorinated polyethylene production technology make acid phase chlorinated polyethylene waste water treatment up to standard, realize waste water resource utilization. The utility model discloses a water treatment is effectual, does not need the flocculating agent during processing, and is particularly suitable for handling Cl-High content chlorinated polyethylene production wastewater.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.
Claims (8)
1. The utility model provides an acid phase method chlorinated polyethylene waste water treatment system which characterized in that: the device comprises a reaction tank, a cross flow filter, a water outlet storage tank, a disc tube type reverse osmosis device and an evaporation device which are sequentially connected together, wherein acidic wastewater enters the cross flow filter after undergoing a neutralization reaction in the reaction tank, a concentrated water outlet of the cross flow filter is connected with the water outlet storage tank, the water outlet storage tank is connected with a wastewater inlet of the disc tube type reverse osmosis device, and the concentrated water outlet of the cross flow filter and a concentrated solution outlet of the disc tube type reverse osmosis device are both connected with the wastewater inlet of the evaporation device.
2. The acid phase method chlorinated polyethylene production wastewater treatment system according to claim 1, characterized in that: the cross flow filter comprises a shell and ceramic membrane filter pipes arranged in the shell at intervals, wherein a waste water inlet and a clear water outlet are respectively formed in two sides of each ceramic membrane filter pipe on the shell, a water distribution disc is arranged at one end, close to the waste water inlet, of each ceramic membrane filter pipe, the outer edge of each water distribution disc is hermetically installed on the inner wall of the shell, a supporting hole used for supporting each ceramic membrane filter pipe is formed in each water distribution disc, a concentrated water header pipe is arranged at one end, close to the clear water outlet, of each ceramic membrane filter pipe, one end of each concentrated water header pipe penetrates out of the shell, the other end of each ceramic membrane filter pipe is a closed end and is located in the shell, one end of each ceramic membrane filter pipe is hermetically installed in the supporting hole, and the other end of each ceramic membrane filter pipe is connected to the concentrated water header pipe in parallel.
3. The acid phase method chlorinated polyethylene production wastewater treatment system according to claim 2, characterized in that: and a water inlet distributor is also arranged inside the shell and positioned at the inner side of the waste water inlet.
4. The acid phase method chlorinated polyethylene production wastewater treatment system according to claim 1, characterized in that: an intermediate tank for storing neutralized wastewater is arranged behind the reaction tank, and the intermediate tank is connected with a wastewater inlet of the cross-flow filter.
5. The acid phase method chlorinated polyethylene production wastewater treatment system according to claim 1, characterized in that: the evaporation equipment adopts an MVR evaporation system.
6. The acid phase method chlorinated polyethylene production wastewater treatment system according to claim 1, characterized in that: the disc tube type reverse osmosis equipment is also connected with a clean water tank, and the disc tube type reverse osmosis equipment and a clean water outlet of the evaporation system are connected with the clean water tank through pipelines.
7. The acid phase method chlorinated polyethylene production wastewater treatment system according to claim 1, characterized in that: the disc tube type reverse osmosis equipment comprises primary DTRO equipment and secondary DTRO equipment, wherein the concentrated solution outlet of the primary DTRO equipment is connected with the wastewater inlet of the secondary DTRO equipment, and the concentrated solution outlet of the secondary DTRO equipment is connected with the wastewater inlet of the evaporation equipment.
8. The acid phase method chlorinated polyethylene production wastewater treatment system according to claim 7, characterized in that: one-level DTRO equipment and second grade DTRO equipment all include central pull rod, diaphragm subassembly and guiding disc spacer sleeve are established on central pull rod, every diaphragm subassembly includes two diaphragms of laminating together from top to bottom and is located the support layer between two diaphragms from top to bottom, central pull rod is hugged closely to the diaphragm subassembly inboard, be equipped with the sealing washer between guiding disc and the central pull rod, the diaphragm is hugged closely respectively to the upper and lower both sides of sealing washer, the guiding disc inboard is hugged closely in the outside of sealing washer, the water purification passageway has between the inboard of sealing washer and the central pull rod.
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