CN112624326A - Control method for membrane pollution in membrane bioreactor and sewage treatment system - Google Patents
Control method for membrane pollution in membrane bioreactor and sewage treatment system Download PDFInfo
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- CN112624326A CN112624326A CN202011461541.6A CN202011461541A CN112624326A CN 112624326 A CN112624326 A CN 112624326A CN 202011461541 A CN202011461541 A CN 202011461541A CN 112624326 A CN112624326 A CN 112624326A
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- 239000012528 membrane Substances 0.000 title claims abstract description 129
- 239000010865 sewage Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000010802 sludge Substances 0.000 claims abstract description 43
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000006722 reduction reaction Methods 0.000 claims abstract description 8
- 238000009285 membrane fouling Methods 0.000 claims description 13
- 238000009295 crossflow filtration Methods 0.000 claims description 9
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 10
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 10
- 241000894006 Bacteria Species 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000002207 metabolite Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000011954 pollution control method Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a method for controlling membrane pollution in a membrane bioreactor, which comprises the following steps: leading the sewage added with the sulfate into an anaerobic bioreactor, and carrying out sulfate reduction reaction to reduce the sulfate in the sewage into sulfide; injecting the sewage mixed liquor and the generated sulfide into an external membrane bioreactor for solid-liquid separation; after being treated by the external membrane bioreactor, the effluent is discharged into a water outlet pool, and the sludge concentrated solution flows back to the anaerobic bioreactor. According to the invention, sulfate reducing bacteria are used for efficiently removing organic matters in sewage under an anaerobic condition, and the membrane bioreactor ensures an efficient solid-liquid separation effect to enable suspended matters and turbidity of system outlet water to be close to zero; the high-efficiency sludge interception function of the membrane bioreactor can effectively prolong the sludge age and the low growth rate of anaerobic sulfate bacteria, so that the sludge yield of the system is greatly reduced; the generation of hydrogen sulfide can effectively control the membrane pollution problem, prolong the service life of the membrane and reduce the maintenance cost.
Description
Technical Field
The invention relates to the technical field of membrane pollution control in a membrane bioreactor, in particular to a method for controlling membrane pollution in an anaerobic dynamic self-generated membrane bioreactor and an anaerobic dynamic self-generated membrane bioreactor sewage treatment system capable of controlling membrane pollution.
Background
The anaerobic dynamic autogenous membrane bioreactor is used as a new sewage treatment process combining membrane separation and biotechnology, has the characteristics of simple process flow, good effluent quality, small occupied area, high microorganism concentration, impact load resistance and the like, and is gradually applied worldwide in recent years. However, the membrane fouling problem is an inevitable phenomenon in the operation of the anaerobic dynamic self-generating membrane bioreactor, which severely restricts the wide practical application thereof. The membrane pollution means that in the anaerobic dynamic self-generating membrane bioreactor, particles, colloidal particles or solute macromolecules of the mixed solution are adsorbed and deposited on the surface of the membrane or in membrane pores; microorganisms such as bacteria also accumulate at the membrane water interface, which leads to a decrease or clogging of the membrane pore size, and a significant decrease in membrane flux and separation characteristics. The presence of membrane fouling causes a decrease in flux in anaerobic membrane bioreactors, increasing the frequency of membrane module cleaning and replacement, which in turn increases capital and operating costs.
At present, the problem of membrane pollution in the anaerobic dynamic self-generating membrane bioreactor process is mainly related to three factors, including the properties of sludge mixed liquor, the properties of membranes and operating conditions. Wherein the sludge mixed liquid has a large influence on membrane pollution. Extracellular polymeric substances, which are microbial metabolites in the sludge mixed liquor, can be deposited on the membrane surface to form a gel layer, so that not only is the organic pollution of the membrane surface increased, but also the physicochemical properties (such as hydrophobicity and the like) of the membrane surface are changed, the adhesion of microorganisms on the membrane surface is promoted, and the biological pollution of the membrane surface is aggravated. In addition, the membrane fouling problem is exacerbated when treating high salinity wastewater, thereby increasing the frequency of membrane cleaning and maintenance costs.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for controlling membrane pollution in a dynamic self-generating membrane bioreactor by utilizing hydrogen sulfide, in particular to a method for treating sewage containing sulfate in an anaerobic membrane bioreactor process. The sulfate reducing bacteria can reduce sulfate into hydrogen sulfide while degrading organic matters in sewage in the anaerobic membrane bioreactor process. The hydrogen sulfide can effectively destroy the extracellular polymeric structure of the sludge, penetrate the bacterial cell membrane and inactivate the protein. Therefore, the hydrogen sulfide generated by the sulfate reducing bacteria is used for controlling membrane pollution in the anaerobic dynamic self-generated membrane bioreactor, and the feasibility is provided.
In order to achieve the above object, the present invention provides a method for controlling membrane fouling in a membrane bioreactor, comprising the steps of:
leading the sewage added with the sulfate into an anaerobic bioreactor, and carrying out sulfate reduction reaction to reduce the sulfate in the sewage into sulfide;
injecting the sewage mixed liquor and the generated sulfide into an external membrane bioreactor for solid-liquid separation;
after being treated by the external membrane bioreactor, the effluent is discharged into a water outlet pool, and the sludge concentrated solution flows back to the anaerobic bioreactor.
In the method for controlling membrane fouling in a membrane bioreactor provided by the invention, the anaerobic bioreactor is an up-flow anaerobic sludge bed reactor.
In the method for controlling membrane fouling in a membrane bioreactor provided by the invention, the external membrane bioreactor is a cross-flow filtration container of an anaerobic membrane bioreactor module.
The invention also provides a membrane bioreactor sewage treatment system capable of controlling membrane pollution, which comprises a water inlet tank, an anaerobic bioreactor, an external membrane bioreactor and a water outlet tank which are sequentially communicated, when in use, sewage added with sulfate is led into the anaerobic bioreactor, and sulfate reduction reaction is carried out to reduce the sulfate in the sewage into sulfide; injecting the sewage mixed liquor and the generated sulfide into an external membrane bioreactor for solid-liquid separation; after being treated by the external membrane bioreactor, the effluent is discharged into a water outlet pool, and the sludge concentrated solution flows back to the anaerobic bioreactor.
In the membrane bioreactor sewage treatment system capable of controlling membrane pollution provided by the invention, the anaerobic bioreactor is an up-flow anaerobic sludge bed reactor, and the water inlet pool is connected with the up-flow anaerobic sludge bed reactor through a water inlet pump.
In the membrane bioreactor sewage treatment system capable of controlling membrane pollution provided by the invention, the external membrane bioreactor is a cross-flow filtering container of an anaerobic membrane bioreactor module, the middle part of the up-flow anaerobic sludge bed reactor is connected with the cross-flow filtering container through a circulating pump, the top of the cross-flow filtering container is connected with the water outlet pool through a water outlet pump, and the bottom of the cross-flow filtering container is connected with the bottom of the up-flow anaerobic sludge bed reactor.
The control method for membrane pollution in the membrane bioreactor and the membrane bioreactor sewage treatment system capable of controlling membrane pollution have the following beneficial effects: according to the invention, sulfate reducing bacteria are utilized to efficiently remove organic matters in the sewage under an anaerobic condition, wherein the membrane bioreactor ensures an efficient solid-liquid separation effect, so that suspended matters and turbidity of system effluent are close to zero; the efficient sludge interception function of the membrane bioreactor can effectively prolong the sludge age and the low growth rate of anaerobic sulfate bacteria, so that the sludge yield of the system is greatly reduced; the method has simple operation steps, realizes the separation of hydraulic retention time and sludge age, resists impact load and occupies small area; the generation of hydrogen sulfide can effectively control the membrane pollution problem, prolong the service life of the membrane and reduce the maintenance cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a flow diagram of a method of the present invention for controlling membrane fouling in a membrane bioreactor;
FIG. 2 is a schematic diagram of a membrane bioreactor sewage treatment system capable of controlling membrane fouling according to the present invention;
FIGS. 3 and 4 are graphs showing the results of the anaerobic membrane bioreactor sewage treatment process provided by the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
FIG. 1 is a flow chart showing a method for controlling membrane fouling in a membrane bioreactor according to the present invention. As shown in FIG. 1, the control method for membrane fouling in a membrane bioreactor provided by the present invention comprises the following steps:
step S1, introducing the sewage added with the sulfate into an anaerobic bioreactor, and carrying out sulfate reduction reaction to reduce the sulfate in the sewage into sulfide;
s2, injecting the sewage mixed liquor and the generated sulfide into an external membrane bioreactor for solid-liquid separation;
and step S3, after the treatment by the external membrane bioreactor, discharging the effluent into a water outlet pool, and refluxing the sludge concentrated solution to the anaerobic bioreactor.
The invention provides a method for controlling membrane pollution in an anaerobic dynamic self-generating membrane bioreactor by utilizing hydrogen sulfide, in particular to a method for treating sulfate-containing sewage in a membrane bioreactor process. The sewage treatment system of the membrane bioreactor comprises an anaerobic bioreactor and an external membrane bioreactor. The anaerobic bioreactor is provided with an up-flow anaerobic sludge bed for reducing sulfate to form sulfide and removing organic matters (COD) in sewage. The anaerobic bioreactor is communicated with the external membrane bioreactor so that the sludge mixed liquor and sulfide enter a membrane assembly of the external membrane bioreactor, liquid in the mixed liquor permeates the membrane under the action of pressure to obtain system outlet water, and anaerobic sludge is intercepted and flows back into the anaerobic bioreactor along with the concentrated solution. And the effluent of the external membrane bioreactor is discharged out of the system.
FIG. 2 is a schematic diagram of a membrane bioreactor sewage treatment system capable of controlling membrane fouling according to the present invention. As shown in FIG. 2, the membrane bioreactor sewage treatment system capable of controlling membrane pollution provided by the invention comprises a water inlet tank 10, an anaerobic bioreactor, an external membrane bioreactor and a water outlet tank 60 which are communicated in sequence. When in use, the sewage added with the sulfate is led into an anaerobic bioreactor to carry out sulfate reduction reaction so that the sulfate in the sewage is reduced into sulfide; injecting the sewage mixed liquor and the generated sulfide into an external membrane bioreactor for solid-liquid separation; after being treated by the external membrane bioreactor, the effluent is discharged into a water outlet pool, and the sludge concentrated solution flows back to the anaerobic bioreactor.
In particular, in this embodiment, the anaerobic bioreactorThe system is an up-flow anaerobic sludge bed reactor 20, the external membrane bioreactor is a cross-flow filtration container 30 comprising an anaerobic membrane bioreactor module 40, as shown in figure 2, the sewage treatment system of the invention comprises a plurality of cross-flow filtration containers 30, and the top end of each cross-flow filtration container is provided with a permeable membrane pressure gauge 50. The sewage is injected into the upflow anaerobic sludge blanket reactor through the water inlet pump 70 to carry out the sulfate reduction reaction. The effective volume of the upflow anaerobic sludge blanket reactor is 10L; the height is 135 cm; then pumping out sludge mixed liquor in the upflow anaerobic sludge blanket reactor at a position with the height of 54cm by a circulating pump 80, injecting the sludge mixed liquor into a cross-flow filtering container which comprises an anaerobic membrane bioreactor module and performing solid-liquid separation; wherein the total length of the anaerobic membrane bioreactor module is 250cm, the inner diameter is 2.2cm, a nylon net membrane with the pore size of 61 mu m is used as a filtering module, and the filtering module is fixed on a stainless steel spring; the stainless steel spring has an outer diameter of 18mm, a height of 228mm, and an effective filtering area of 0.0129m2. The whole cross-flow filtering container is kept closed, and the flow rate is stabilized at 30L/m2H. The effluent of the system is pumped out from the top of the cross-flow filtering container by an effluent pump 90 and then discharged into an effluent pool, and the sludge concentrated solution flows back to the upflow anaerobic sludge bed reactor from the bottom of the cross-flow filtering container. The hydraulic retention time of the whole sewage treatment process is 4 h. The set of anaerobic membrane bioreactor sewage treatment process is stably operated for 240 days under laboratory conditions, and the main results (refer to fig. 3 and fig. 4) are as follows: the organic matter removal efficiency of the sewage reaches 86 percent, and the concentration of the hydrogen sulfide is about 50mg S/L; the turbidity of the effluent is maintained below 5-7 NTU. The back flushing operation interval of the anaerobic membrane bioreactor is 16-21 days, which can prove that the membrane pollution problem is controlled under the action of hydrogen sulfide.
Compared with the prior art, the membrane pollution control method for the membrane bioreactor and the membrane bioreactor sewage treatment system capable of controlling membrane pollution can efficiently remove organic matters in sewage under an anaerobic condition by using sulfate reducing bacteria, wherein the membrane bioreactor ensures an efficient solid-liquid separation effect, so that suspended matters and turbidity of effluent of the system are close to zero; the efficient sludge interception function of the membrane bioreactor can effectively prolong the sludge age and the low growth rate of anaerobic sulfate bacteria, so that the sludge yield of the system is greatly reduced; the method has simple operation steps, realizes the separation of hydraulic retention time and sludge age, resists impact load and occupies small area; the generation of hydrogen sulfide can effectively control the membrane pollution problem, prolong the service life of the membrane and reduce the maintenance cost.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (6)
1. A method for controlling membrane fouling in a membrane bioreactor, comprising the steps of:
leading the sewage added with the sulfate into an anaerobic bioreactor, and carrying out sulfate reduction reaction to reduce the sulfate in the sewage into sulfide;
injecting the sewage mixed liquor and the generated sulfide into an external membrane bioreactor for solid-liquid separation;
after being treated by the external membrane bioreactor, the effluent is discharged into a water outlet pool, and the sludge concentrated solution flows back to the anaerobic bioreactor.
2. The method of claim 1 for controlling membrane fouling in a membrane bioreactor, wherein the anaerobic bioreactor is an upflow anaerobic sludge blanket reactor.
3. The method of claim 1, wherein the external membrane bioreactor is a crossflow filtration vessel of an anaerobic membrane bioreactor module.
4. A membrane bioreactor sewage treatment system capable of controlling membrane pollution is characterized by comprising a water inlet tank, an anaerobic bioreactor, an external membrane bioreactor and a water outlet tank which are sequentially communicated, wherein when the system is used, sewage added with sulfate is guided into the anaerobic bioreactor, and sulfate reduction reaction is carried out to reduce the sulfate in the sewage into sulfide; injecting the sewage mixed liquor and the generated sulfide into an external membrane bioreactor for solid-liquid separation; after being treated by the external membrane bioreactor, the effluent is discharged into a water outlet pool, and the sludge concentrated solution flows back to the anaerobic bioreactor.
5. The membrane bioreactor sewage treatment system capable of controlling membrane pollution according to claim 4, wherein the anaerobic bioreactor is an up-flow anaerobic sludge bed reactor, and the water inlet tank is connected to the up-flow anaerobic sludge bed reactor through a water inlet pump.
6. The membrane bioreactor sewage treatment system capable of controlling membrane pollution according to claim 5, wherein the external membrane bioreactor is a cross-flow filtration container comprising an anaerobic membrane bioreactor module, the middle part of the up-flow anaerobic sludge bed reactor is connected to the cross-flow filtration container through a circulating pump, the top of the cross-flow filtration container is connected to the water outlet tank through a water outlet pump, and the bottom of the cross-flow filtration container is connected to the bottom of the up-flow anaerobic sludge bed reactor.
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