CN110550701A - Zero-emission concentration system for reverse osmosis process by using forward osmosis membrane module - Google Patents
Zero-emission concentration system for reverse osmosis process by using forward osmosis membrane module Download PDFInfo
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- CN110550701A CN110550701A CN201910846716.6A CN201910846716A CN110550701A CN 110550701 A CN110550701 A CN 110550701A CN 201910846716 A CN201910846716 A CN 201910846716A CN 110550701 A CN110550701 A CN 110550701A
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- reverse osmosis
- forward osmosis
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- water
- osmosis
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 124
- 238000009292 forward osmosis Methods 0.000 title claims abstract description 105
- 239000012528 membrane Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000000243 solution Substances 0.000 claims abstract description 19
- 239000011550 stock solution Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims description 37
- 238000001704 evaporation Methods 0.000 claims description 11
- 230000008020 evaporation Effects 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 2
- 238000011069 regeneration method Methods 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims 1
- 230000003204 osmotic effect Effects 0.000 abstract description 4
- 239000012267 brine Substances 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 7
- 239000002351 wastewater Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Abstract
The invention provides a zero-emission concentration system for performing a reverse osmosis process by using a forward osmosis membrane component, which comprises the following components: a pretreatment subsystem, a reverse osmosis unit subsystem, and a forward osmosis unit subsystem, the forward osmosis unit subsystem comprising: the device comprises a reverse osmosis concentrated water tank, a forward osmosis water inlet pump, a forward osmosis high-pressure pump, a forward osmosis device, a forward osmosis drawing liquid water inlet pump and a forward osmosis precision filter, wherein at least one forward osmosis membrane assembly is arranged in the forward osmosis device; the concentrated water of the reverse osmosis concentrated water tank is simultaneously used as the stock solution and the drawing solution of the forward osmosis membrane component. The invention creatively utilizes the structural characteristics of the forward osmosis membrane component, and simultaneously inputs the concentrated water of the reverse osmosis subsystem at two sides of the forward osmosis membrane component, so as to greatly reduce the osmotic pressure difference and the operating pressure at two sides of the membrane.
Description
Technical Field
The invention belongs to the technical field of zero-discharge water treatment, and particularly relates to a zero-discharge concentration system for performing a reverse osmosis process by using a forward osmosis membrane component.
Background
The zero-discharge water treatment technology is a technology that after wastewater containing salts or pollutants (such as paper-making wastewater, electroplating wastewater, mine site wastewater and the like) is subjected to a membrane separation process and an evaporation process, and concentrated and crystallized, the salts or the pollutants in the wastewater are recycled as chemical raw materials in a solid form or transferred to a garbage treatment plant for treatment, fresh water in the wastewater is completely recycled, and no waste liquid is discharged from the plant. Zero-emission projects typically include a pretreatment system, a primary concentration system, a secondary concentration system, and an evaporation system. Wherein, the secondary concentration system is a high concentration state that the waste water of preliminary concentration is further concentrated to salt or pollutant are close to saturation, is the important system that reduces evaporation system scale and energy consumption, influences zero release engineering investment and running cost.
At present, a secondary concentration system is mainly a system formed by technologies or technology combinations such as ultrahigh-pressure reverse osmosis, electrodialysis, multi-effect evaporation and the like. The operating pressure of the ultrahigh pressure reverse osmosis process is up to 12 MPa, and the requirements on equipment such as a high-pressure pump, a reverse osmosis membrane shell, an energy recovery device and the like, pipelines, valves and instruments are very high, so that the investment on the ultrahigh pressure reverse osmosis process equipment is very high, and the system stability is not high. The electrodialysis process has small treatment scale, and the inert electrode has serious loss in high-concentration brine, thereby limiting the scale application of the inert electrode. The essence of the secondary concentration system is to reduce the scale and energy consumption of the evaporation system, and the multi-effect evaporation process is adopted at the stage, so that the wastewater treatment capacity is larger, the scale of evaporation equipment is amplified by several times, and a large amount of energy is consumed in latent heat of vaporization of water, so that the zero-emission engineering land, the equipment investment and the operation cost are very high. Therefore, a secondary concentration system which has low equipment investment and operation cost and high stability and can be applied in a large scale is needed, and the economy, the stability and the adaptability of the zero-emission engineering are improved.
Disclosure of Invention
The invention aims to provide a zero-emission concentration system for performing a reverse osmosis process by using a forward osmosis membrane component, aiming at the defects in the prior art.
For this reason, the above object of the present invention is achieved by the following technical solutions:
A zero-emission concentration system for performing a reverse osmosis process using a forward osmosis membrane module, the zero-emission concentration system comprising: the pretreatment subsystem, the reverse osmosis device subsystem and the forward osmosis device subsystem, wherein the forward osmosis device subsystem comprises: the device comprises a reverse osmosis concentrated water tank, a forward osmosis water inlet pump, a forward osmosis high-pressure pump, a forward osmosis device, a forward osmosis liquid drawing water inlet pump and a forward osmosis precision filter, wherein at least one forward osmosis membrane assembly is arranged in the forward osmosis device; the concentrated water of the reverse osmosis concentrated water tank is simultaneously used as the stock solution and the drawing solution of the forward osmosis membrane component, and respectively enters the stock solution side of the forward osmosis membrane component through the forward osmosis water inlet pump and the forward osmosis high-pressure pump and enters the drawing solution side of the forward osmosis membrane component through the forward osmosis liquid drawing water inlet pump and the forward osmosis precise filter.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
As a preferred technical scheme of the present invention, the diluted draw solution at the draw solution outlet of the forward osmosis membrane module is merged with the raw water treated by the pretreatment subsystem, and then the merged draw solution is used as the inlet water of the reverse osmosis device subsystem to be introduced into the inlet of the reverse osmosis device subsystem.
As a preferred technical solution of the present invention, the pretreatment subsystem includes: a raw water pump, a filter, a COD remover, a softener, a regeneration device and an intermediate water tank; raw water is pressurized by a raw water pump in sequence, and enters an intermediate water tank after being filtered by a filter, a COD remover and a softener to remove COD and hardness, so as to be used as the inlet water of a reverse osmosis device subsystem.
As a preferred embodiment of the present invention, the reverse osmosis apparatus subsystem includes: the device comprises a reverse osmosis water inlet pump, a reverse osmosis precise filter, a reverse osmosis high-pressure pump and a reverse osmosis device, wherein at least one reverse osmosis membrane component is arranged in the reverse osmosis device; the inlet water of the reverse osmosis device subsystem sequentially passes through a reverse osmosis inlet pump, a reverse osmosis precise filter and a reverse osmosis high-pressure pump and then enters a reverse osmosis membrane module, and the produced water of the reverse osmosis membrane module is the produced water of the zero-emission concentration system; the inlet water of the reverse osmosis device subsystem is concentrated by the reverse osmosis membrane component and then is used as the inlet water of the forward osmosis device subsystem, and enters the reverse osmosis concentrated water tank.
As a preferable technical scheme of the invention, the filtration precision of the forward osmosis precise filter and/or the reverse osmosis precise filter is 5 μm.
As a preferred technical scheme of the invention, the zero-emission concentration system is also provided with an energy recovery subsystem, and the energy recovery subsystem is used for recovering pressure energy in concentrated water of the reverse osmosis device and the forward osmosis device.
As a preferred technical solution of the present invention, the energy recovery subsystem includes a first energy recovery device and a second energy recovery device; the high-pressure side inlet of the first energy recovery device is communicated with a concentrated water outlet of the reverse osmosis device, and the low-pressure side outlet of the first energy recovery device is communicated with a reverse osmosis concentrated water tank; the low-pressure side inlet of the first energy recovery device is communicated with a pipeline in front of the reverse osmosis high-pressure pump, and the high-pressure side outlet of the first energy recovery device is communicated with the pressure lift pump and conveyed to the water inlet of the reverse osmosis device; the high-pressure side inlet of the second energy recovery device is communicated with the concentrated water outlet of the forward osmosis device, and the low-pressure side outlet of the second energy recovery device is communicated with the evaporation system; and the low-pressure side inlet of the second energy recovery device is communicated with a pipeline in front of the reverse osmosis high-pressure pump, and the high-pressure side outlet of the second energy recovery device is communicated with the water inlet of the reverse osmosis device.
As a preferred technical scheme of the invention, the operating pressure range of the reverse osmosis high-pressure pump and/or the forward osmosis high-pressure pump is 5.0 ~ 7.0.0 MPa, and the head is 500 ~ 700 m.
As a preferred technical scheme of the invention, the operating pressure range of the pressure lift pump is 5.0 ~ 7.0.0 Mpa, and the head is 20 ~ 40 m.
The invention provides a zero-emission concentration system for performing a reverse osmosis process by utilizing a forward osmosis membrane component, which creatively utilizes the structural characteristics of the forward osmosis membrane component, simultaneously inputs concentrated water of a reverse osmosis subsystem at two sides of the forward osmosis membrane component, greatly reduces the osmotic pressure difference and the operating pressure at two sides of the membrane, and under the driving of a forward osmosis high-pressure pump, water molecules in forward osmosis stock solution overcome the osmotic pressure difference, permeate the forward osmosis membrane, enter a draw solution detection device, so that high concentrated brine and low concentrated brine are obtained and are respectively used for crystallization and used as water inlet of the reverse osmosis device subsystem. The structural characteristics of the reverse osmosis membrane module ensure that concentrated water is input at the water production side (module central pipe) of the reverse osmosis membrane, and the effect of reducing the osmotic pressure difference and the operating pressure at the two sides of the membrane can not be achieved. In addition, the zero-emission concentration system for performing the reverse osmosis process by using the forward osmosis membrane module provided by the invention also has the following beneficial effects:
(1) The reverse osmosis device subsystem is coupled with the forward osmosis device subsystem, so that the required operating pressure or treatment scale of the original zero-discharge concentration system is greatly reduced, the equipment investment and operation cost of the system are reduced, and the stability and adaptability of the system are improved.
(2) The system water production meets the sanitary standard of drinking water (GB 5749-2006); the concentrated water of the system is in a high concentration state with salt or pollutant close to saturation, and can directly enter an evaporation system for crystallization.
(3) The zero-emission concentration system is tested and researched in a seawater desalination strong brine comprehensive utilization project, 7% of strong brine discharged by a seawater desalination plant is concentrated into 18% of high-concentration brine, the high-concentration brine directly enters a salt pan for sun drying salt, and the sun drying salt efficiency is improved by about 5 times. The experimental research result shows that the zero-emission concentration system for performing the reverse osmosis process by using the forward osmosis membrane component has reasonable design, the quality of produced water reaches the standard, the operation is stable and reliable, and the system is a reasonable and effective concentration system for zero-emission engineering.
Drawings
Fig. 1 is a schematic diagram of a zero-emission concentration system including an energy recovery device for performing a reverse osmosis process using a forward osmosis membrane module according to the present invention.
Detailed Description
The invention is described in further detail with reference to the figures and specific embodiments.
A zero-emission concentration system for performing a reverse osmosis process using a forward osmosis membrane module, comprising: the pretreatment subsystem, the reverse osmosis device subsystem and the forward osmosis device subsystem, the forward osmosis device subsystem comprises: the device comprises a reverse osmosis concentrated water tank 11, a forward osmosis water inlet pump 12, a forward osmosis high-pressure pump 13, a forward osmosis device 14, a forward osmosis drawing liquid inlet pump 15 and a forward osmosis precise filter 16, wherein at least one forward osmosis membrane component is arranged in the forward osmosis device 14; the concentrated water in the reverse osmosis concentrated water tank 11 is simultaneously used as the stock solution and the draw solution of the forward osmosis membrane module in the forward osmosis device 14, and respectively enters the stock solution side of the forward osmosis membrane module in the forward osmosis device 14 through the forward osmosis water inlet pump 12 and the forward osmosis high-pressure pump 13 and enters the draw solution side of the forward osmosis membrane module in the forward osmosis device 14 through the forward osmosis draw solution water inlet pump 15 and the forward osmosis precise filter 16.
The diluted draw solution at the draw solution outlet of the forward osmosis membrane module in the forward osmosis device 14 is merged with the raw water treated by the pretreatment subsystem and then is used as the inlet water of the reverse osmosis device subsystem to be introduced into the inlet of the reverse osmosis device subsystem.
The pretreatment subsystem comprises: a raw water pump 1, a filter 2, a COD remover 3, a softener 4, a regenerating device 5 and an intermediate water tank 6; raw water is pressurized by a raw water pump 1 in sequence, and is filtered by a filter 2, a COD remover 3 and a softener 4 to remove COD and hardness and then enters an intermediate water tank 6 to be used as inlet water of a reverse osmosis device subsystem.
The reverse osmosis unit subsystem includes: the device comprises a reverse osmosis water inlet pump 7, a reverse osmosis precision filter 8, a reverse osmosis high-pressure pump 9 and a reverse osmosis device 10, wherein at least one reverse osmosis membrane component is arranged in the reverse osmosis device 10; the inlet water of the reverse osmosis device subsystem is pressurized by a reverse osmosis inlet pump 7 and a reverse osmosis high-pressure pump 9 in sequence and then enters a reverse osmosis membrane component in a reverse osmosis device 10, and the produced water of the reverse osmosis device 10 is the produced water of the zero-emission concentration system; the inlet water of the reverse osmosis device subsystem is concentrated by a reverse osmosis membrane component in the reverse osmosis device 10 and then is used as the inlet water of the forward osmosis device subsystem, and enters a reverse osmosis concentrated water tank 11.
The filtration precision of the two ultrafilters (reverse osmosis ultrafilter 8 and forward osmosis ultrafilter 16) was 5 μm.
The zero-emission concentration system is also provided with an energy recovery subsystem, and the energy recovery subsystem is used for recovering pressure energy in the concentrated water of the reverse osmosis device and the forward osmosis device.
The energy recovery subsystem comprises a first energy recovery device 17 and a second energy recovery device 19; the high-pressure side inlet of the first energy recovery device 17 is communicated with the concentrated water outlet of the reverse osmosis device 10, and the low-pressure side outlet is communicated with the reverse osmosis concentrated water tank 11; the low-pressure side inlet of the first energy recovery device 17 is communicated with a pipeline in front of the reverse osmosis high-pressure pump 9, and the high-pressure side outlet is communicated with the pressure lift pump 18 and is conveyed to the water inlet of the reverse osmosis device 10; the high-pressure side inlet of the second energy recovery device 19 is communicated with the concentrated water outlet of the forward osmosis device 14, and the low-pressure side outlet is communicated with the evaporation system; the low-pressure side inlet of the second energy recovery device 19 is communicated with a pipeline in front of the reverse osmosis high-pressure pump 9, and the high-pressure side outlet is communicated with the water inlet of the reverse osmosis device 10.
The operating pressure ranges of the reverse osmosis high-pressure pump 9 and the forward osmosis high-pressure pump 13 are 5.0 ~ 7.0.0 Mpa, and the head is 500 ~ 700 m.
The operation pressure range of the pressure-lift pump 18 is 5.0 ~ 7.0.0 Mpa, and the head is 20 ~ 40 m.
The above-described embodiments are intended to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.
Claims (7)
1. A zero-emission concentration system for performing a reverse osmosis process using a forward osmosis membrane module, the zero-emission concentration system comprising: the pretreatment subsystem, the reverse osmosis device subsystem and the forward osmosis device subsystem, wherein the forward osmosis device subsystem comprises: the device comprises a reverse osmosis concentrated water tank, a forward osmosis water inlet pump, a forward osmosis high-pressure pump, a forward osmosis device, a forward osmosis liquid drawing water inlet pump and a forward osmosis precision filter, wherein at least one forward osmosis membrane assembly is arranged in the forward osmosis device; the concentrated water of the reverse osmosis concentrated water tank is simultaneously used as the stock solution and the drawing solution of the forward osmosis membrane component, and respectively enters the stock solution side of the forward osmosis membrane component through the forward osmosis water inlet pump and the forward osmosis high-pressure pump and enters the drawing solution side of the forward osmosis membrane component through the forward osmosis liquid drawing water inlet pump and the forward osmosis precise filter.
2. the zero-emission concentration system for performing a reverse osmosis process using a forward osmosis membrane module according to claim 1, wherein: and the diluted draw solution at the draw solution outlet of the forward osmosis membrane module is converged with the raw water treated by the pretreatment subsystem and then is introduced into the inlet of the reverse osmosis device subsystem as the inlet water of the reverse osmosis device subsystem.
3. The zero-emission concentration system for performing a reverse osmosis process using a forward osmosis membrane module according to claim 1, wherein: the pre-processing subsystem comprises: a raw water pump, a filter, a COD remover, a softener, a regeneration device and an intermediate water tank; raw water is pressurized by a raw water pump in sequence, and enters an intermediate water tank after being filtered by a filter, a COD remover and a softener to remove COD and hardness, so as to be used as the inlet water of a reverse osmosis device subsystem.
4. The zero-emission concentration system for performing a reverse osmosis process using a forward osmosis membrane module according to claim 1, wherein: the reverse osmosis unit subsystem comprises: the device comprises a reverse osmosis water inlet pump, a reverse osmosis precise filter, a reverse osmosis high-pressure pump and a reverse osmosis device, wherein at least one reverse osmosis membrane component is arranged in the reverse osmosis device; the inlet water of the reverse osmosis device subsystem sequentially passes through a reverse osmosis inlet pump, a reverse osmosis precise filter and a reverse osmosis high-pressure pump and then enters a reverse osmosis membrane module, and the produced water of the reverse osmosis membrane module is the produced water of the zero-emission concentration system; the inlet water of the reverse osmosis device subsystem is concentrated by the reverse osmosis membrane component and then is used as the inlet water of the forward osmosis device subsystem, and enters the reverse osmosis concentrated water tank.
5. The zero-emission concentration system for a reverse osmosis process using a forward osmosis membrane module according to claim 1 or 4, wherein: the filtration precision of the forward osmosis precise filter and/or the reverse osmosis precise filter is 5 mu m.
6. The zero-emission concentration system for performing a reverse osmosis process using a forward osmosis membrane module according to claim 1, wherein: the zero-emission concentration system is also provided with an energy recovery subsystem, and the energy recovery subsystem is used for recovering pressure energy in the concentrated water of the reverse osmosis device and the forward osmosis device.
7. The zero-emission concentration system for performing a reverse osmosis process using a forward osmosis membrane module according to claim 6, wherein: the energy recovery subsystem comprises a first energy recovery device and a second energy recovery device; the high-pressure side inlet of the first energy recovery device is communicated with a concentrated water outlet of the reverse osmosis device, and the low-pressure side outlet of the first energy recovery device is communicated with a reverse osmosis concentrated water tank; the low-pressure side inlet of the first energy recovery device is communicated with a pipeline in front of the reverse osmosis high-pressure pump, and the high-pressure side outlet of the first energy recovery device is communicated with the pressure lift pump and conveyed to the water inlet of the reverse osmosis device; the high-pressure side inlet of the second energy recovery device is communicated with the concentrated water outlet of the forward osmosis device, and the low-pressure side outlet of the second energy recovery device is communicated with the evaporation system; and the low-pressure side inlet of the second energy recovery device is communicated with a pipeline in front of the reverse osmosis high-pressure pump, and the high-pressure side outlet of the second energy recovery device is communicated with the water inlet of the reverse osmosis device.
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