Reclaimed water reuse treatment system
By optimizing the process design of the greywater and concentrate treatment units, the problem of concentrate reverse osmosis permeate backflow in the greywater reuse system was solved, reducing salt enrichment in the greywater reverse osmosis membrane and high-pressure pump energy consumption, extending the cleaning cycle of the crystallization and salt separation unit, and improving the utilization rate of recycled water.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-27
AI Technical Summary
In existing wastewater reuse systems, the problem of concentrated reverse osmosis permeate recirculation leads to an increase in the feed water volume to the wastewater reverse osmosis membrane, salt accumulation on the surface of the concentrated reverse osmosis membrane, increased osmotic pressure and energy consumption, and affects the utilization rate of recycled water and the operating load of the crystallization and salt separation unit.
By optimizing the process design of the greywater and concentrate treatment units, the concentrate outlet of the greywater reverse osmosis membrane is sent to the concentrate pretreatment tank, and the second-stage permeate of the concentrate reverse osmosis membrane is sent to the high-concentration brine tank. This avoids the concentrate circulating within the system, reduces the amount of high-concentration brine entering the crystallization and salt separation device, and lowers the energy consumption of the high-pressure pump and the operating load of the crystallization and salt separation device.
It solved the problem of concentrated reverse osmosis permeate reflux, slowed down the salt accumulation of reclaimed water reverse osmosis membranes, reduced the energy consumption of high-pressure pumps, extended the cleaning cycle of crystallization and salt separation devices, and improved the utilization rate of recycled water.
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Figure CN224047184U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to water treatment technical field, concretely relates to middle water reuse treatment system. BACKGROUND
[0002] As an important component of energy and chemical industry in China, the problem of wastewater treatment and reuse has become a key factor restricting the sustainable development of coal chemical industry.
[0003] The currently used middle water reuse system has many problems, such as Figure 1 As shown in the figure, the concentrated water reverse osmosis water is not sent out of the whole system, but is sent back to the middle water ultrafiltration water pool of the middle water treatment unit, which undoubtedly increases the water inflow of the middle water reverse osmosis membrane and increases the treatment intensity of the middle water reverse osmosis membrane; the high-salt concentrated water of the concentrated water reverse osmosis water is all sent to the zero discharge device for crystallization and salt separation, part of which is returned to the concentrated water pretreatment pool for hardness and silicon removal, but the high-salt concentrated water eventually enters the surface of the concentrated water reverse osmosis membrane, causing the salt on the surface of the concentrated water reverse osmosis membrane to continuously enrich, the osmotic pressure to increase, the inter-stage pressure difference to increase, and the energy consumption of the high-pressure pump to increase, affecting the indicators of the concentrated water reverse osmosis water, thereby reducing the utilization rate of the reuse water; the second-stage water of the concentrated water reverse osmosis membrane is returned to the ion bed water pool, and the high-salt concentrated water formed in this way is continuously enriched in the system, which increases the electric conductivity and hardness of the high-salt water sent to the zero discharge device, and increases the operation load of the crystallization and salt separation device, causing the evaporator to scale seriously and be cleaned frequently. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a middle water reuse treatment system.
[0005] The utility model is implemented by the following technical schemes: a middle water reuse treatment system comprises a middle water treatment unit, a concentrated water treatment unit and a crystallization unit;
[0006] The middle water treatment unit comprises a middle water pretreatment pool, a middle water intermediate pool, a middle water ultrafiltration membrane, a middle water ultrafiltration water pool and a middle water reverse osmosis membrane.
[0007] The outlet of the middle water pretreatment pool is connected with the inlet pipeline of the middle water intermediate pool, the outlet of the middle water intermediate pool is connected with the inlet pipeline of the middle water ultrafiltration membrane, the outlet of the middle water ultrafiltration membrane is connected with the inlet pipeline of the middle water ultrafiltration water pool, the outlet of the middle water ultrafiltration water pool is connected with the inlet pipeline of the middle water reverse osmosis membrane, and the concentrated water outlet of the middle water reverse osmosis membrane is connected with the inlet pipeline of the concentrated water pretreatment pool of the concentrated water treatment unit.
[0008] Further, the concentrated water treatment unit comprises a concentrated water pretreatment tank, a concentrated water intermediate tank, a concentrated water ultrafiltration membrane, a concentrated water ultrafiltration product tank, a concentrated water resin ion bed, an ion bed product tank, a concentrated water reverse osmosis membrane, and a concentrated water reverse osmosis product tank, the outlet of the concentrated water pretreatment tank is connected with the inlet pipeline of the concentrated water intermediate tank, the outlet of the concentrated water intermediate tank is connected with the inlet pipeline of the concentrated water ultrafiltration membrane, the outlet of the concentrated water ultrafiltration membrane is connected with the inlet pipeline of the concentrated water ultrafiltration product tank, the outlet of the concentrated water ultrafiltration product tank is connected with the inlet pipeline of the concentrated water resin ion bed, the outlet of the concentrated water resin ion bed is connected with the inlet pipeline of the ion bed product tank, the outlet of the ion bed product tank is connected with the inlet pipeline of the concentrated water reverse osmosis membrane, the water outlet of the concentrated water reverse osmosis membrane is connected with the inlet pipeline of the concentrated water reverse osmosis product tank, and the outlet of the concentrated water reverse osmosis product tank is connected with the inlet pipeline of the intermediate water reverse osmosis product tank.
[0009] Further, the crystallization unit comprises a high-concentration brine tank and a crystallization salt separation device, the concentrated water outlet of the concentrated water reverse osmosis membrane is connected with the inlet pipeline of the high-concentration brine tank, and the outlet of the high-concentration brine tank is connected with the inlet pipeline of the crystallization salt separation device.
[0010] Further, the water outlet of the intermediate water reverse osmosis membrane is connected with the inlet pipeline of the intermediate water reverse osmosis product tank, and the outlet of the intermediate water reverse osmosis product tank is connected with the inlet pipeline of a circulating water cooling tower and a production fire water tank respectively.
[0011] Further, the second-stage water outlet of the concentrated water reverse osmosis membrane is connected with the inlet pipeline of the high-concentration brine tank.
[0012] The system solves the problem of concentrated water reverse osmosis product backflow, avoids increasing the water inflow of the intermediate water reverse osmosis membrane, influences the water production index, slows down the salt enrichment on the surface of the concentrated water reverse osmosis membrane, reduces the energy consumption of the high-pressure pump, reduces the operation load of the crystallization salt separation device, reduces the evaporation device scaling, and prolongs the cleaning cycle. BRIEF DESCRIPTION OF DRAWINGS
[0013] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.
[0014] Figure 1 It is a flowchart of the prior art;
[0015] Figure 2 It is a flowchart of the present application;
[0016] In the diagram: 1. Greywater treatment unit, 1.1. Greywater pretreatment tank, 1.2. Greywater intermediate tank, 1.3. Greywater ultrafiltration membrane, 1.4. Greywater ultrafiltration permeate tank, 1.5. Greywater reverse osmosis membrane, 2. Concentrate treatment unit, 2.1. Concentrate pretreatment tank, 2.2. Concentrate ultrafiltration membrane, 2.3. Concentrate ultrafiltration permeate tank, 2.4. Concentrate resin ion bed, 2.5. Ion bed permeate tank, 2.6. Concentrate reverse osmosis membrane, 2.7. Concentrate reverse osmosis permeate tank, 2.8. Crystallization unit, 3. High concentration brine tank, 3.1. Crystallization and salt separation device, 3.2. Greywater reverse osmosis permeate tank, 4. Circulating water cooling tower, 5. Production and fire-fighting water tank, 6. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] like Figure 2 As shown, the greywater reuse treatment system includes a greywater treatment unit 1, a concentrated water treatment unit 2, and a crystallization unit 3.
[0019] The greywater treatment unit 1 includes a greywater pretreatment tank 1.1, a greywater intermediate tank 1.2, a greywater ultrafiltration membrane 1.3, a greywater ultrafiltration product tank 1.4, and a greywater reverse osmosis membrane 1.5;
[0020] The outlet of the greywater pretreatment tank 1.1 is connected to the inlet pipeline of the greywater intermediate tank 1.2. The outlet of the greywater intermediate tank 1.2 is connected to the inlet pipeline of the greywater ultrafiltration membrane 1.3. The outlet of the greywater ultrafiltration membrane 1.3 is connected to the inlet pipeline of the greywater ultrafiltration product tank 1.4. The outlet of the greywater ultrafiltration product tank 1.4 is connected to the inlet pipeline of the greywater reverse osmosis membrane 1.5. The concentrate outlet of the greywater reverse osmosis membrane 1.5 is connected to the inlet pipeline of the concentrate pretreatment tank 2.1 of the concentrate treatment unit 2. All the concentrate from the greywater reverse osmosis membrane 1.5 is sent to the concentrate pretreatment tank 2.1 to slow down the salt accumulation of the greywater reverse osmosis membrane 1.5 and improve the quality of the greywater reverse osmosis product water.
[0021] The concentrated water treatment unit 2 comprises a concentrated water pretreatment tank 2.1, a concentrated water intermediate tank 2.2, a concentrated water ultrafiltration membrane 2.3, a concentrated water ultrafiltration product tank 2.4, a concentrated water resin ion bed 2.5, an ion bed product tank 2.6, a concentrated water reverse osmosis membrane 2.7, a concentrated water reverse osmosis product tank 2.8, the outlet of the concentrated water pretreatment tank 2.1 is connected with the inlet of the concentrated water intermediate tank 2.2 through a pipeline, the outlet of the concentrated water intermediate tank 2.2 is connected with the inlet of the concentrated water ultrafiltration membrane 2.3 through a pipeline, the outlet of the concentrated water ultrafiltration membrane 2.3 is connected with the inlet of the concentrated water ultrafiltration product tank 2.4 through a pipeline, the outlet of the concentrated water ultrafiltration product tank 2.4 is connected with the inlet of the concentrated water resin ion bed 2.5 through a pipeline, the outlet of the concentrated water resin ion bed 2.5 is connected with the inlet of the ion bed product tank 2.6 through a pipeline, the outlet of the ion bed product tank 2.6 is connected with the inlet of the concentrated water reverse osmosis membrane 2.7 through a pipeline, the product outlet of the concentrated water reverse osmosis membrane 2.7 is connected with the inlet of the concentrated water reverse osmosis product tank 2.8 through a pipeline, and the outlet of the concentrated water reverse osmosis product tank 2.8 is connected with the inlet of the intermediate water reverse osmosis product tank 4 through a pipeline, so that the concentrated water reverse osmosis product backflow problem is solved, the water inflow of the intermediate water reverse osmosis membrane 1.5 is avoided to be increased, and the water production index is affected.
[0022] The crystallization unit 3 comprises a high-concentration brine tank 3.1 and a crystallization salt separation device 3.2, the concentrated water outlet of the concentrated water reverse osmosis membrane 2.7 is connected with the inlet of the high-concentration brine tank 3.1 through a pipeline, and the outlet of the high-concentration brine tank 3.1 is connected with the inlet of the crystallization salt separation device 3.2 through a pipeline, so that the concentrated water reverse osmosis high-salt concentrated water is sent to the zero-emission device, the high-salt water is avoided to circulate in the whole concentrated water device, the salt enrichment on the surface of the concentrated water reverse osmosis membrane is slowed down, and the energy consumption of the high-pressure pump is reduced.
[0023] The water outlet of the intermediate water reverse osmosis membrane 1.5 is connected with the inlet of the intermediate water reverse osmosis product tank 4 through a pipeline, and the outlet of the intermediate water reverse osmosis product tank 4 is connected with the inlets of a circulating water cooling tower 5 and a production fire water tank 6 through pipelines.
[0024] The second-stage water outlet of the concentrated water reverse osmosis membrane 2.7 is connected with the inlet of the high-concentration brine tank 3.1 through a pipeline, the concentrated water reverse osmosis second-stage product can be adjusted to enter the high-concentration brine tank 3.1 according to the water index, so that the conductivity and hardness of the high-salt water sent to the zero-emission device are reduced, the operation load of the crystallization salt separation device 3.2 is reduced, the evaporator fouling is reduced, and the cleaning period is prolonged.
[0025] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A reclaimed water treatment system, characterized by, It includes a reclaimed water treatment unit, a concentrated water treatment unit, and a crystallization unit. The reclaimed water treatment unit includes a reclaimed water pretreatment pool, a reclaimed water intermediate pool, a reclaimed water ultrafiltration membrane, a reclaimed water ultrafiltration water pool, and a reclaimed water reverse osmosis membrane. The outlet of the reclaimed water pretreatment pool is connected to the inlet pipeline of the reclaimed water intermediate pool, the outlet of the reclaimed water intermediate pool is connected to the inlet pipeline of the reclaimed water ultrafiltration membrane, the outlet of the reclaimed water ultrafiltration membrane is connected to the inlet pipeline of the reclaimed water ultrafiltration water pool, the outlet of the reclaimed water ultrafiltration water pool is connected to the inlet pipeline of the reclaimed water reverse osmosis membrane, and the concentrated water outlet of the reclaimed water reverse osmosis membrane is connected to the inlet pipeline of the concentrated water pretreatment pool of the concentrated water treatment unit.
2. The water reuse treatment system of claim 1, wherein The concentrated water treatment unit includes a concentrated water pretreatment pool, a concentrated water intermediate pool, a concentrated water ultrafiltration membrane, a concentrated water ultrafiltration water pool, a concentrated water resin ion bed, an ion bed water pool, a concentrated water reverse osmosis membrane, and a concentrated water reverse osmosis water pool.
3. The water reuse treatment system of claim 2, wherein The outlet of the concentrated water pretreatment pool is connected to the inlet pipeline of the concentrated water intermediate pool, the outlet of the concentrated water intermediate pool is connected to the inlet pipeline of the concentrated water ultrafiltration membrane, the outlet of the concentrated water ultrafiltration membrane is connected to the inlet pipeline of the concentrated water ultrafiltration water pool, the outlet of the concentrated water ultrafiltration water pool is connected to the inlet pipeline of the concentrated water resin ion bed, the outlet of the concentrated water resin ion bed is connected to the inlet pipeline of the ion bed water pool, the outlet of the ion bed water pool is connected to the inlet pipeline of the concentrated water reverse osmosis membrane, the water outlet of the concentrated water reverse osmosis membrane is connected to the inlet pipeline of the concentrated water reverse osmosis water pool, and the outlet of the concentrated water reverse osmosis water pool is connected to the inlet pipeline of the reclaimed water reverse osmosis water pool.
4. The water reuse treatment system of claim 3, wherein The crystallization unit includes a high-concentration brine tank and a crystallization salt separation device.
5. The water reuse treatment system of claim 4, wherein The concentrated water outlet of the concentrated water reverse osmosis membrane is connected to the inlet pipeline of the high-concentration brine tank, and the outlet of the high-concentration brine tank is connected to the inlet pipeline of the crystallization salt separation device. The water outlet of the reclaimed water reverse osmosis membrane is connected to the inlet pipeline of the reclaimed water reverse osmosis water pool, and the outlet of the reclaimed water reverse osmosis water pool is connected to the inlet pipeline of a circulating water cooling tower and a production fire water pool. The second-stage water outlet of the concentrated water reverse osmosis membrane is connected to the inlet pipeline of the high-concentration brine tank.