CN111285549B - Immersed membrane distillation assembly and sewage biological treatment system thereof - Google Patents
Immersed membrane distillation assembly and sewage biological treatment system thereof Download PDFInfo
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- CN111285549B CN111285549B CN202010154065.7A CN202010154065A CN111285549B CN 111285549 B CN111285549 B CN 111285549B CN 202010154065 A CN202010154065 A CN 202010154065A CN 111285549 B CN111285549 B CN 111285549B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
- B01D61/366—Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- 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
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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Abstract
The invention belongs to the technical field of sewage treatment, and particularly relates to an immersed membrane distillation assembly and a sewage biological treatment system thereof. The immersed membrane distillation assembly comprises a plurality of membrane distillation units and mounting plates arranged on two sides of the plurality of membrane distillation units, the membrane distillation units comprise plastic silk nets arranged at the center, the plastic silk nets are arranged in the middle of gaskets, supporting plates, gaskets, microporous hydrophobic membranes, the supporting plates and an assembly frame are sequentially arranged on the left side and the right side of the plastic silk nets from near to far, a plurality of air dispersing through holes are uniformly formed in the front side and the rear side of the assembly frame, an air inlet pipe is arranged at the bottom of the assembly frame, and a water distributor is further arranged in the assembly frame. The invention directly sprays the sewage or the mixed liquid on the microporous hydrophobic membrane through the water distributor, can increase the surface temperature of the microporous hydrophobic membrane on the side of the hot chamber by 10-15 ℃, and can effectively weaken the phenomenon of temperature difference polarization.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an immersed membrane distillation assembly and a sewage biological treatment system thereof.
Background
The membrane distillation is a membrane separation process which depends on the steam pressure difference at two sides of a hydrophobic membrane as the driving force of mass transfer, has the advantages of common distillation and membrane separation, and can obviously reduce energy consumption by utilizing solar energy or industrial waste heat. In actual operation, a gas-liquid interface is formed on the surface of a membrane hole of a hydrophobic membrane through the temperature difference of two sides of a constructed membrane, water is changed into water vapor through evaporation, the water vapor penetrates through the hydrophobic membrane to reach a cold side, and the water vapor is condensed into distilled water for recycling.
The membrane bioreactor is a water treatment technology combining a membrane separation unit and a biological treatment unit, replaces a traditional secondary sedimentation tank with a membrane component, keeps high activated sludge concentration in the bioreactor, improves the biological treatment organic load, reduces the occupied area of sewage treatment facilities, reduces the residual sludge amount by keeping low sludge load, and has the advantages of high separation efficiency, small occupied area, good effluent quality and the like.
Patent No. CN101374591B, the patent name "treating contaminated inflow by using membrane distillation bioreactor" discloses a method for treating contaminated inflow, mainly relating to a method and system for treating contaminated inflow or wastewater by using membrane distillation bioreactor, but the method and membrane module involved in the invention are only used in laboratory stage, and the problems of concentration polarization, temperature difference polarization and membrane contamination are serious in industrial large-scale use.
Patent No. CN102417210B, patent name "an immersed vacuum membrane distillation device and sewage treatment method thereof" discloses an immersed vacuum membrane distillation device and a sewage treatment method, which can reduce concentration polarization and temperature difference polarization, but the membrane distillation component has large area and compact structure, is not suitable for a membrane bioreactor, does not relate to a biological treatment process, and has low membrane component assembly.
Disclosure of Invention
The invention provides an immersed membrane distillation assembly and a sewage biological treatment system thereof, aiming at the problem that the immersed membrane distillation assembly cannot balance the conditions of reducing concentration polarization, temperature difference polarization and membrane pollution, reducing occupied area and forming a compact structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
an immersed membrane distillation assembly comprises a plurality of membrane distillation units and mounting plates arranged on two sides of the plurality of membrane distillation units, wherein a plurality of bolt rods are arranged on the mounting plates and the plurality of membrane distillation units in a penetrating manner, nuts are screwed at two ends of the bolt rods to fasten the mounting plates and the plurality of membrane distillation units together, each membrane distillation unit comprises a plastic wire mesh arranged at the center, the plastic wire mesh is arranged in the middle of a gasket, a supporting plate, a gasket, a microporous hydrophobic membrane, a supporting plate and an assembly frame are sequentially arranged on the left side and the right side of the plastic wire mesh from near to far, the gasket is a rectangular frame with a hollow middle part, the supporting plate is a flat plate with a plurality of through holes, the assembly frame is a rectangular frame, a plurality of air dispersing through holes are uniformly arranged on the front side and the rear side of the assembly frame, and an air inlet pipe is arranged at the bottom of the assembly frame, the air inlet pipe is uniformly provided with a plurality of air outlet nozzles so as to spray air to the microporous hydrophobic membrane beside the component frame, the component frame is internally provided with a water distributor, the water distributor is uniformly provided with a plurality of nozzles, the nozzles are in one-to-one correspondence with the through holes in the supporting plate respectively so as to uniformly spray sewage or mixed liquid on the microporous hydrophobic membrane beside the component frame, a closed space is formed between two microporous hydrophobic membranes at two sides of the plastic wire mesh to form a cold chamber, and a hot chamber is formed between the microporous hydrophobic membranes and the component frame.
Furthermore, an exhaust pipe is arranged at the upper part of the membrane distillation unit in a penetrating way so as to exhaust water vapor or cooling medium in the cold chamber.
Still further, a medium pipeline is arranged at the lower part of the membrane distillation unit in a penetrating way so as to send cooling medium into the cold chamber.
Furthermore, when the air-gap type membrane distillation is adopted, a condensing plate is further arranged between the plastic wire mesh and a support plate adjacent to the plastic wire mesh, a gasket is further arranged between the condensing plate and the support plate, an air chamber is formed between the condensing plate and the microporous hydrophobic membrane, a cooling chamber is arranged between the two condensing plates and is used for allowing a cooling medium to pass through, and a condensed water outlet is arranged below the air chamber.
Further, the support plate is any one of a pp plate, an organic glass plate, or a stainless steel plate.
Furthermore, the air outlet nozzle on the air inlet pipe is arranged upwards in an inclined manner of 45 degrees.
The utility model provides an immersed membrane distillation sewage biological treatment system, includes membrane bioreactor, aeration equipment, membrane distillation subsystem and water tank of intaking, immersed membrane distillation subassembly among the membrane distillation subsystem sets up inside membrane bioreactor, aeration equipment passes through the gas pipeline and supplies air to the intake pipe on the immersed membrane distillation subassembly the bottom of membrane bioreactor is provided with the sewage export, the sewage export is connected with the water-locator on the immersed membrane distillation subassembly through the outside hydrothermal solution pipeline of membrane bioreactor, forms sewage circulation be provided with heat exchanger and circulating pump on the hydrothermal solution pipeline, the delivery port of water tank of intaking is connected with the water inlet of heat exchanger through the pipeline that has the valve be provided with the level gauge on the membrane bioreactor the bottom of membrane bioreactor is provided with the drain.
Further, the membrane distillation subsystem is any one of a direct contact type membrane distillation system, an air gap type membrane distillation system, a vacuum type membrane distillation system or an air sweep type membrane distillation system.
Still further, the heat exchanger utilizes solar energy or industrial waste heat to heat the sewage or mixed liquid in the hydrothermal solution pipeline.
Compared with the prior art, the invention has the following advantages:
1. the invention directly sprays sewage or mixed liquid on the microporous hydrophobic membrane through the water distributor, can improve the surface temperature of the microporous hydrophobic membrane on the hot chamber side by 10-15 ℃, and can effectively weaken the phenomenon of temperature difference polarization, simultaneously, the invention adopts an immersion mode to reduce the heat loss in the distillation process, and uniformly distributes the cooling medium of the cold chamber through the plastic wire mesh so that the temperature of the cold chamber can be maintained in a certain range, and the phenomenon of temperature difference polarization can be further weakened;
2. according to the invention, the air inlet pipe is arranged at the lower part of the component frame, air is injected to the microporous hydrophobic membrane through the air inlet pipe, uniform bubbles are generated below the microporous hydrophobic membrane to form turbulence, the phenomena of temperature difference polarization and concentration polarization can be weakened, meanwhile, pollutants attached to the surface of the microporous hydrophobic membrane can be eluted, the pollution influence of the membrane is relieved, the stable flux is ensured, and the running time and the service life are prolonged;
3. the sewage or mixed liquid is fed from the upper part of the hot chamber, the cooling medium is fed from the lower part of the cold chamber, the temperature difference is further increased by adopting a cross flow mode, the heat transfer resistance is reduced, and the phenomenon of temperature difference polarization is weakened;
4. the immersed membrane distillation assembly is formed by assembling all the structures in a layered mode, is compact in structure and small in occupied area, the steam exhaust pipe and the medium pipeline are arranged in a penetrating mode, the external structure is reduced, the compactness of the immersed membrane distillation assembly is enhanced, meanwhile, the immersed membrane distillation assembly can be automatically assembled according to the size of a membrane bioreactor so as to adapt to the size of the membrane bioreactor, and the immersed membrane distillation assembly is more convenient to use.
Drawings
FIG. 1 is a schematic structural diagram of an immersed membrane distillation module in examples 1, 3 and 4;
FIG. 2 is an enlarged view of a portion of circle A of FIG. 1;
FIG. 3 is a schematic structural diagram of an immersed membrane distillation module in example 1, example 3 and example 4;
FIG. 4 is a schematic view showing the structure of a submerged membrane distillation module in example 2;
FIG. 5 is an enlarged view of a portion of circle B of FIG. 4;
FIG. 6 is a schematic view showing the structure of a biological treatment system for sewage by submerged membrane distillation in example 1;
FIG. 7 is a schematic view showing the structure of a biological sewage treatment system by immersed membrane distillation in example 2;
FIG. 8 is a schematic view showing the structure of a biological sewage treatment system by immersed membrane distillation in example 3;
FIG. 9 is a schematic view showing the structure of a biological sewage treatment system by immersed membrane distillation in example 4;
Detailed Description
In order to further illustrate the technical solution of the present invention, the present invention is further illustrated by the following examples.
Example 1
As shown in fig. 1, 2, 3 and 6, an immersed membrane distillation assembly comprises a plurality of membrane distillation units 1 and mounting plates 2 arranged at two sides of the plurality of membrane distillation units 1, a plurality of bolt rods 3 are arranged on the mounting plates 2 and the plurality of membrane distillation units 1 in a penetrating manner, nuts 4 are screwed at two ends of the bolt rods 3 to fasten the mounting plates 2 and the plurality of membrane distillation units 1 together, the membrane distillation unit 1 comprises a plastic wire net 101 arranged at the center, the plastic wire net 101 is arranged in the middle of a gasket 102, a support plate 103, a gasket 102, a microporous hydrophobic membrane 104, a support plate 103 and an assembly frame 105 are arranged on the left side and the right side of the plastic wire net 101 from near to far in sequence, the gasket 102 is a rectangular frame with a hollow middle part, the support plate 103 is a pp plate with a plurality of through holes 106 uniformly drilled, the assembly frame 105 is a rectangular frame, a plurality of air dispersing through holes 107 are uniformly arranged on the front side and the rear side of the component frame 105, an air inlet pipe 108 is arranged at the bottom of the component frame 105, a plurality of 45-degree inclined upward air outlet nozzles are uniformly arranged on the air inlet pipe 108 to spray air to the microporous hydrophobic membrane 104 beside the component frame 105, a water distributor 109 is further arranged in the component frame 105, a plurality of nozzles are uniformly arranged on the water distributor 109, the nozzles are respectively in one-to-one correspondence with the through holes 106 on the supporting plate 103 to uniformly spray sewage or mixed liquid to the microporous hydrophobic membrane 104 beside the component frame 105, a closed space is formed between the two microporous hydrophobic membranes 104 on the two sides of the plastic wire mesh 101 to form a cold chamber, and a hot chamber is formed between the microporous hydrophobic membranes 104 and the component frame 105. An exhaust pipe 110 is provided through an upper portion of the membrane distillation unit 1 to exhaust water vapor or a cooling medium in the cold chamber. A medium line 111 is also provided through the lower part of the membrane distillation unit 1 to feed a cooling medium into the cold chamber.
An immersed membrane distillation sewage biological treatment system comprises a membrane bioreactor 01, an aeration device 02, a membrane distillation subsystem 03 and a water inlet tank 04, wherein an immersed membrane distillation component in the membrane distillation subsystem 03 is arranged inside the membrane bioreactor 01, the aeration device 02 supplies air to an air inlet pipe 108 on the immersed membrane distillation component through an air pipeline 05, a sewage outlet 011 is arranged at the bottom of the membrane bioreactor 01, the sewage outlet 011 is connected with a water distributor 109 on the immersed membrane distillation component through a hydrothermal pipeline 06 outside the membrane bioreactor 01 to form sewage circulation, a heat exchanger 07 and a circulating pump are arranged on the hydrothermal pipeline 06, the heat exchanger 07 heats sewage or mixed liquid in the hydrothermal pipeline 06 by utilizing solar energy or industrial waste heat, a water outlet of the water inlet tank 04 is connected with a water inlet of the heat exchanger 07 through a pipeline with a valve, the membrane bioreactor 01 is provided with a liquid level meter 012, and the bottom of the membrane bioreactor 01 is provided with a drain 013. The membrane distillation subsystem 03 is a direct contact type membrane distillation system, and comprises an immersed membrane distillation assembly, a liquid pump 031, a condenser 032 and a water production water tank 033, wherein the liquid pump 031 conveys cooling water from the water production water tank 033 to a medium pipeline 111, and the cooling water brings water vapor out of a cold chamber from a steam exhaust pipe 110 under the thrust action of the liquid pump 031 and returns to the water production water tank 033 after being cooled by the condenser 032.
Example 2
As shown in fig. 4, 5 and 7, an immersed membrane distillation assembly comprises a plurality of membrane distillation units 1 and mounting plates 2 arranged at two sides of the plurality of membrane distillation units 1, wherein a plurality of bolt rods 3 are arranged on the mounting plates 2 and the plurality of membrane distillation units 1 in a penetrating manner, nuts 4 are screwed at two ends of the bolt rods 3 to fasten the mounting plates 2 and the plurality of membrane distillation units 1 together, the membrane distillation unit 1 comprises a plastic wire mesh 101 arranged at the center, the plastic wire mesh 101 is arranged in the middle of a gasket 102, a condensing plate 112, a gasket 102, a support plate 103, a gasket 102, a microporous hydrophobic membrane 104, a support plate 103 and an assembly frame 105 are arranged at the left side and the right side of the plastic wire mesh 101 in sequence from near to far, the gasket 102 is a rectangular frame with a hollow middle part, the support plate 103 is a plexiglass plate with a plurality of through holes 106 uniformly drilled, the module frame 105 is a rectangular frame, a plurality of air-diffusing through holes 107 are uniformly arranged on the front and rear sides of the module frame 105, an air inlet pipe 108 is arranged at the bottom of the module frame 105, a plurality of 45-degree upward inclined air outlet nozzles are uniformly arranged on the air inlet pipe 108 to spray air to the microporous hydrophobic membrane 104 beside the module frame 105, a water distributor 109 is also arranged in the component frame 105, a plurality of nozzles are uniformly arranged on the water distributor 109, the plurality of nozzles are respectively in one-to-one correspondence with the through holes 106 on the supporting plate 103, so as to uniformly spray the sewage or the mixed liquid on the microporous hydrophobic membrane 104 beside the module frame 105, the closed space between the two condensation plates 112 on both sides of the plastic mesh 101, which constitutes a cold chamber, the sealed space between the condensation plate 112 and the microporous hydrophobic membrane 104 forms an air chamber, and a condensed water outlet 113 is provided below the air chamber. The microporous hydrophobic membrane 104 to the module frame 105 forms a thermal chamber therebetween. An exhaust pipe 110 is provided through an upper portion of the membrane distillation unit 1 to exhaust water vapor or a cooling medium in the cold chamber. A medium line 111 is also provided through the lower part of the membrane distillation unit 1 to feed a cooling medium into the cold chamber.
An immersed membrane distillation sewage biological treatment system comprises a membrane bioreactor 01, an aeration device 02, a membrane distillation subsystem 03 and a water inlet tank 04, wherein an immersed membrane distillation component in the membrane distillation subsystem 03 is arranged inside the membrane bioreactor 01, the aeration device 02 supplies air to an air inlet pipe 108 on the immersed membrane distillation component through an air pipeline 05, a sewage outlet 011 is formed in the bottom of the membrane bioreactor 01, the sewage outlet 011 is connected with a water distributor 109 on the immersed membrane distillation component through a hydrothermal pipeline 06 outside the membrane bioreactor 01 to form sewage circulation, a heat exchanger 07 and a circulating pump are arranged on the hydrothermal pipeline 06, and the heat exchanger 07 heats sewage or mixed liquid in the hydrothermal pipeline 06 by utilizing solar energy or industrial waste heat. The water outlet of the water inlet tank 04 is connected with the water inlet of the heat exchanger 07 through a pipeline with a valve, the membrane bioreactor 01 is provided with a liquid level meter 012, and the bottom of the membrane bioreactor 01 is provided with a drain 013. The membrane distillation subsystem 03 is an air gap type membrane distillation system and comprises an immersed membrane distillation assembly, a liquid pump 031, a condenser 032 and a water production water tank 033, wherein the liquid pump 031 and the condenser 032 are respectively connected with a steam exhaust pipe 110 and a medium pipeline 111 on the immersed membrane distillation assembly to form a cooling medium circulation loop. The water producing water tank 033 is connected to the condensed water outlet 113, and the height of the water producing water tank 033 is lower than the height of the condensed water outlet 113.
Example 3
As shown in fig. 1, 2, 3 and 8, an immersed membrane distillation assembly comprises a plurality of membrane distillation units 1 and mounting plates 2 arranged at two sides of the plurality of membrane distillation units 1, a plurality of bolt rods 3 are arranged on the mounting plates 2 and the plurality of membrane distillation units 1 in a penetrating manner, nuts 4 are screwed at two ends of the bolt rods 3 to fasten the mounting plates 2 and the plurality of membrane distillation units 1 together, the membrane distillation unit 1 comprises a plastic wire net 101 arranged at the center, the plastic wire net 101 is arranged in the middle of a gasket 102, a support plate 103, a gasket 102, a microporous hydrophobic membrane 104, a support plate 103 and an assembly frame 105 are arranged on the left side and the right side of the plastic wire net 101 from near to far in sequence, the gasket 102 is a rectangular frame with a hollow middle part, the support plate 103 is a stainless steel plate with a plurality of through holes 106 uniformly drilled, the assembly frame 105 is a rectangular frame, a plurality of air dispersing through holes 107 are uniformly arranged on the front side and the rear side of the component frame 105, an air inlet pipe 108 is arranged at the bottom of the component frame 105, a plurality of 45-degree inclined upward air outlet nozzles are uniformly arranged on the air inlet pipe 108 to spray air to the microporous hydrophobic membrane 104 beside the component frame 105, a water distributor 109 is further arranged in the component frame 105, a plurality of nozzles are uniformly arranged on the water distributor 109, the nozzles are respectively in one-to-one correspondence with the through holes 106 on the supporting plate 103 to uniformly spray sewage or mixed liquid to the microporous hydrophobic membrane 104 beside the component frame 105, a closed space is formed between the two microporous hydrophobic membranes 104 on the two sides of the plastic wire mesh 101 to form a cold chamber, and a hot chamber is formed between the microporous hydrophobic membranes 104 and the component frame 105. An exhaust pipe 110 is provided through an upper portion of the membrane distillation unit 1 to exhaust water vapor or a cooling medium in the cold chamber.
An immersed membrane distillation sewage biological treatment system comprises a membrane bioreactor 01, an aeration device 02, a membrane distillation subsystem 03 and a water inlet tank 04, wherein an immersed membrane distillation component in the membrane distillation subsystem 03 is arranged inside the membrane bioreactor 01, the aeration device 02 supplies air to an air inlet pipe 108 on the immersed membrane distillation component through an air pipeline 05, a sewage outlet 011 is formed in the bottom of the membrane bioreactor 01, the sewage outlet 011 is connected with a water distributor 109 on the immersed membrane distillation component through a hydrothermal pipeline 06 outside the membrane bioreactor 01 to form sewage circulation, a heat exchanger 07 and a circulating pump are arranged on the hydrothermal pipeline 06, and the heat exchanger 07 heats sewage or mixed liquid in the hydrothermal pipeline 06 by utilizing solar energy or industrial waste heat. The water outlet of the water inlet tank 04 is connected with the water inlet of the heat exchanger 07 through a pipeline with a valve, the membrane bioreactor 01 is provided with a liquid level meter 012, and the bottom of the membrane bioreactor 01 is provided with a drain 013. The membrane distillation subsystem 03 is a vacuum type membrane distillation system and comprises an immersed membrane distillation assembly, a vacuum pump 035, a condenser 032 and a water production water tank 033, wherein two ends of the vacuum pump 035 are respectively connected with a steam exhaust pipe 110 and the condenser 032 on the immersed membrane distillation assembly, the vacuum pump 035 pumps the cold chamber to negative pressure, water vapor passes through the vacuum pump 035 from the steam exhaust pipe 110 to reach the condenser 032 in a negative pressure state, the water vapor is condensed into water in the condenser 032, and the water vapor is finally collected to the water production water tank 033.
Example 4
As shown in fig. 1, 2, 3 and 9, an immersed membrane distillation assembly comprises a plurality of membrane distillation units 1 and mounting plates 2 arranged at two sides of the plurality of membrane distillation units 1, a plurality of bolt rods 3 are arranged on the mounting plates 2 and the plurality of membrane distillation units 1 in a penetrating manner, nuts 4 are screwed at two ends of the bolt rods 3 to fasten the mounting plates 2 and the plurality of membrane distillation units 1 together, the membrane distillation unit 1 comprises a plastic wire net 101 arranged at the center, the plastic wire net 101 is arranged in the middle of a gasket 102, a support plate 103, a gasket 102, a microporous hydrophobic membrane 104, a support plate 103 and an assembly frame 105 are arranged on the left side and the right side of the plastic wire net 101 from near to far in sequence, the gasket 102 is a rectangular frame with a hollow middle part, the support plate 103 is a pp plate with a plurality of through holes 106 uniformly drilled, the assembly frame 105 is a rectangular frame, a plurality of air dispersing through holes 107 are uniformly arranged on the front side and the rear side of the component frame 105, an air inlet pipe 108 is arranged at the bottom of the component frame 105, a plurality of 45-degree inclined upward air outlet nozzles are uniformly arranged on the air inlet pipe 108 to spray air to the microporous hydrophobic membrane 104 beside the component frame 105, a water distributor 109 is further arranged in the component frame 105, a plurality of nozzles are uniformly arranged on the water distributor 109, the nozzles are respectively in one-to-one correspondence with the through holes 106 on the supporting plate 103 to uniformly spray sewage or mixed liquid to the microporous hydrophobic membrane 104 beside the component frame 105, a closed space is formed between the two microporous hydrophobic membranes 104 on the two sides of the plastic wire mesh 101 to form a cold chamber, and a hot chamber is formed between the microporous hydrophobic membranes 104 and the component frame 105. An exhaust pipe 110 is provided through an upper portion of the membrane distillation unit 1 to exhaust water vapor or a cooling medium in the cold chamber. A medium line 111 is also provided through the lower part of the membrane distillation unit 1 to feed a cooling medium into the cold chamber.
An immersed membrane distillation sewage biological treatment system comprises a membrane bioreactor 01, an aeration device 02, a membrane distillation subsystem 03 and a water inlet tank 04, wherein an immersed membrane distillation component in the membrane distillation subsystem 03 is arranged inside the membrane bioreactor 01, the aeration device 02 supplies air to an air inlet pipe 108 on the immersed membrane distillation component through an air pipeline 05, a sewage outlet 011 is formed in the bottom of the membrane bioreactor 01, the sewage outlet 011 is connected with a water distributor 109 on the immersed membrane distillation component through a hydrothermal pipeline 06 outside the membrane bioreactor 01 to form sewage circulation, a heat exchanger 07 and a circulating pump are arranged on the hydrothermal pipeline 06, and the heat exchanger 07 heats sewage or mixed liquid in the hydrothermal pipeline 06 by utilizing solar energy or industrial waste heat. The water outlet of the water inlet tank 04 is connected with the water inlet of the heat exchanger 07 through a pipeline with a valve, the membrane bioreactor 01 is provided with a liquid level meter 012, and the bottom of the membrane bioreactor 01 is provided with a drain 013. The membrane distillation subsystem 03 is an air-swept membrane distillation system and comprises an immersed membrane distillation assembly, an air pump 036, a condenser 032 and a water production water tank 033, wherein the air pump 036 sends cold air into a cold chamber through a medium pipeline 111, takes water vapor in the cold chamber out of the condenser 032 from an exhaust pipe 110, condenses the water into water through the condenser 032, and then flows into the water production water tank 033.
Experimental data
The site near a sewage treatment plant of a certain petrochemical plant is used as an experimental site, the petrochemical wastewater subjected to floating oil pretreatment is treated by adopting the embodiment 1, the device continuously operates for 12 months, and the designed water yield is 1m3And d. The water quality COD of the inlet water is 252-458mg/L, the conductivity is 3351-5368 mu s/cm, the turbidity is 3.2-13.3NTU, the COD of the outlet water is not detected, the conductivity is less than 50 mu s/cm, and the turbidity is less than 0.2 NTU. The cleaning period of the membrane is 2-3 months, the membrane is cleaned by using acid cleaning, alkali cleaning and bacterial cleaning agents, and the water flux recovery rate after cleaning is 98%.
Experimental data show that the membrane distillation assembly designed by the invention can ensure stable water flux when immersed in activated sludge of a bioreactor, and meanwhile, the membrane cleaning period can be prolonged to 2-3 months, so that the continuous operation time of the reactor and the service life of the membrane are greatly prolonged. In addition, the membrane module has compact structure, can reduce the occupied area, and can realize large-scale industrialized expansion by modular design.
While there have been shown and described what are at present considered to be the essential features and advantages of the invention, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. An immersed membrane distillation module characterized by: the membrane distillation device comprises a plurality of membrane distillation units (1) and mounting plates (2) arranged on two sides of the plurality of membrane distillation units (1), wherein a plurality of bolt rods (3) penetrate through the mounting plates (2) and the plurality of membrane distillation units (1), nuts (4) are screwed at two ends of each bolt rod (3) to fasten the mounting plates (2) and the plurality of membrane distillation units (1), each membrane distillation unit (1) comprises a plastic wire mesh (101) arranged at the center, the plastic wire mesh (101) is arranged in the middle of a gasket (102), supporting plates (103), gaskets (102), microporous hydrophobic membranes (104), the supporting plates (103) and an assembly frame (105) are sequentially arranged on the left side and the right side of the plastic wire mesh (101) from near to far, the gaskets (102) are rectangular frames hollowed in the middle, and the supporting plates (103) are flat plates uniformly hollowed with a plurality of through holes (106), the component frame (105) is a rectangular frame, a plurality of air-dispersing through holes (107) are uniformly arranged at the front side and the rear side of the component frame (105), an air inlet pipe (108) is arranged at the bottom of the component frame (105), a plurality of air outlet nozzles are uniformly arranged on the air inlet pipe (108), to inject gas onto the microporous hydrophobic membrane (104) next to the module frame (105), a water distributor (109) is also arranged in the component frame (105), a plurality of nozzles are uniformly arranged on the water distributor (109), the plurality of nozzles are respectively in one-to-one correspondence with the through holes (106) on the supporting plate (103), so as to uniformly spray the sewage or the mixed liquid on the microporous hydrophobic membrane (104) beside the component frame (105), a closed space is formed between the two microporous hydrophobic membranes (104) at the two sides of the plastic silk screen (101) to form a cold chamber, the microporous hydrophobic membrane (104) to the module frame (105) form a thermal chamber therebetween.
2. The submerged membrane distillation module of claim 1, wherein: an exhaust pipe (110) is arranged at the upper part of the membrane distillation unit (1) in a penetrating way to exhaust water vapor or cooling medium in the cold chamber.
3. The submerged membrane distillation module of claim 2, wherein: a medium pipeline (111) is also arranged at the lower part of the membrane distillation unit (1) in a penetrating way to send cooling medium into the cold chamber.
4. A submerged membrane distillation module according to claim 3, wherein: when the air-gap membrane distillation is adopted, a condensing plate (112) is further arranged between the plastic wire mesh (101) and a supporting plate (103) adjacent to the plastic wire mesh (101), a gasket (102) is further arranged between the condensing plate (112) and the supporting plate (103), an air chamber is formed between the condensing plate (112) and the microporous hydrophobic membrane (104), a cold chamber is arranged between the two condensing plates (112) and is used for allowing a cooling medium to pass through, and a condensed water outlet (113) is arranged below the air chamber.
5. The submerged membrane distillation module of claim 1, wherein: the support plate (103) is any one of a pp plate, an organic glass plate or a stainless steel plate.
6. The submerged membrane distillation module of claim 1, wherein: and the air outlet nozzle on the air inlet pipe (108) is arranged upwards in an inclined manner at an angle of 45 degrees.
7. An immersed membrane distillation sewage biological treatment system utilizing the immersed membrane distillation assembly of claim 1, wherein: comprises a membrane bioreactor (01), an aeration device (02), a membrane distillation subsystem (03) and a water inlet tank (04), wherein an immersed membrane distillation component in the membrane distillation subsystem (03) is arranged inside the membrane bioreactor (01), the aeration device (02) supplies air to an air inlet pipe (108) on the immersed membrane distillation component through a gas pipeline (05), a sewage outlet (011) is arranged at the bottom of the membrane bioreactor (01), the sewage outlet (011) is connected with a water distributor (109) on the immersed membrane distillation component through a hydrothermal pipeline (06) outside the membrane bioreactor (01) to form sewage circulation, a heat exchanger (07) and a circulating pump (08) are arranged on the hydrothermal pipeline (06), a water outlet of the water inlet tank (04) is connected with a water inlet of the heat exchanger (07) through a pipeline with a valve, the membrane bioreactor (01) is provided with a liquid level meter (012), and the bottom of the membrane bioreactor (01) is provided with a drain outlet (013).
8. The submerged membrane distillation sewage biological treatment system according to claim 7, wherein: the membrane distillation subsystem (03) is any one of a direct contact type membrane distillation system, an air gap type membrane distillation system, a vacuum type membrane distillation system or an air sweeping type membrane distillation system.
9. The submerged membrane distillation sewage biological treatment system according to claim 7, wherein: the heat exchanger (07) heats sewage or mixed liquid in the hydrothermal solution pipeline (06) by using solar energy or industrial waste heat.
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| CN1254303C (en) * | 2004-04-27 | 2006-05-03 | 内蒙古工业大学 | Method for increasing flux of membrane distillation and membrane distillation device |
| WO2008088293A1 (en) * | 2007-01-18 | 2008-07-24 | Hyflux Membrane Manufacturing (S) Pte Ltd | Membrane contactor |
| CN101659495A (en) * | 2008-08-29 | 2010-03-03 | 北京清大国华环保科技有限公司 | Membrane distillation bioreactor device and method |
| TW201714834A (en) * | 2015-03-02 | 2017-05-01 | 席凡索斯公司 | High-efficiency desalination |
| NL2017839B1 (en) * | 2016-11-22 | 2018-05-28 | Cevap Tech B V | Distillation apparatus and use thereof |
| US10981805B2 (en) * | 2017-03-16 | 2021-04-20 | Khalifa University of Science and Technology | Solar humidifier in a humidification-dehumidification type desalination system |
| CN109539637A (en) * | 2018-11-01 | 2019-03-29 | 青岛海尔空调电子有限公司 | Film evaporative condenser |
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