CN114031171A - Hydrogen-based membrane bio-membrane reactor - Google Patents
Hydrogen-based membrane bio-membrane reactor Download PDFInfo
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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
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- 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
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- 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
- C02F2103/06—Contaminated groundwater or leachate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (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 hydrogen-based membrane bio-membrane reactor, which relates to the technical field of sewage treatment devices and comprises a mainstream reactor, an air supply structure and a water bucket, wherein the mainstream reactor comprises a first reactor main body, a first dispersion membrane component is arranged in the first reactor main body, the first dispersion membrane component comprises a first fiber membrane bundle, the first fiber membrane bundle comprises a plurality of hollow fiber membranes, gaps are formed among the hollow fiber membranes of the first dispersion membrane component, two ends of each hollow fiber membrane of the first dispersion membrane component respectively extend out of the first reactor main body and are communicated with the air supply structure, the lower end of the first reactor main body is provided with a first inlet, the upper end of the first reactor main body is provided with a first outlet, the first inlet is communicated with the water bucket, and the first outlet is communicated with an outlet valve. The invention can effectively increase the attachment area of microorganisms, enables the microorganisms to be uniformly attached, and simultaneously can improve the biomass accumulation, so that the reactor has higher anti-pollution load capacity.
Description
Technical Field
The invention relates to the technical field of sewage treatment devices, in particular to a hydrogen-based membrane bio-membrane reactor.
Background
China is a big agricultural country, and chemical fertilizers such as nitrogen fertilizers and the like are used once and a lot for improving the crop yield and improving the soil fertility, but researches show that only 25% -40% of the applied nitrogen fertilizers are absorbed and utilized by crops, and most of the residual nitrogen fertilizers in the soil flow into underground and rivers along with rainwater and irrigation, so that the nitrate pollution in the underground water is serious. Currently, the most common methods for removing nitrate from water are: physical, chemical, biological methods. The physical and chemical techniques for removing contaminants mainly include evaporation, membrane filtration (e.g., reverse osmosis, nanofiltration, etc.), ion exchange, advanced oxidation, and electrochemical processes, and these methods have some disadvantages, such as high operation cost, difficulty in achieving desired treatment efficiency, and difficulty in subsequent treatment. Compared with the prior art, the biological treatment technology has the advantages of low operation cost, good treatment effect, no secondary pollution and the like.
As a novel biological treatment technology, the hydrogen autotrophic denitrification utilizes hydrogen as an electron donor to reduce oxidizing substances in water, does not need to add organic carbon sources, does not produce secondary pollution, and is suitable for treating surface water and underground water in an oligotrophic environment.
A Hydrogen-based membrane bio-membrane reactor (MBfR) is based on Hydrogen autotrophic denitrification to diffuse a microporous hollow fiber membrane (H)2) Organically combined with the autotrophic biofilm technology, inorganic carbon is taken as a carbon source, H2A novel water treatment technology for completing the biological reduction process for the reaction of an electron donor on the surface of a biological membrane. By means of H2Reducing oxidative contaminants (e.g. CrO)4 2-、AsO4 3-、SeO4 2-、NO3 -、ClO4 -、BrO3 -Etc.) has high efficiency, no toxicity, no secondary pollution and no secondary pollution2High utilization rate and the like and incomparable characteristics of the traditional biomembrane method. H2The membrane module in MBfR plays a key role for the whole system as a carrier for the biofilm and a medium for bubble-free diffusion of gas.
At present, most of the membrane modules assembled in a bundling mode are adopted in theoretical research and practical engineering application, the membrane modules are usually solidified together along with the long-term operation of a reactor, and the biological membranes form a surrounding ring at the periphery of the membrane modules and are mainly concentrated at the outer layer due to H2The property of bidirectional diffusion of substrate in MBfR, the lack of soluble substrate and H in biofilm in the inner layer of the membrane module due to the longer diffusion distance2Excessive, so that the activity of the biofilm is inhibited, and the performance of the reactor is influenced; in all membrane biofilm reactors, the contaminant removal performance depends on the accumulation and activity of the biofilm, an overly thin biofilm does not have sufficient biomass to catalyze the reaction, but an overly thick biofilm increases the mass transfer resistance into the biofilm, and therefore the amount of biofilm is particularly important for contaminant removal. Aiming at the traditional hydrogen-based membrane biofilm reactor, the biofilm is controlled by mostly adopting hydraulic shearing and intermittent aeration modes, but the received effect is poor, and the control difficulty is high due to the non-uniformity of the biofilm attached to a carrier, so a measure is urgently needed to solve the problemA problem is solved.
Disclosure of Invention
The invention aims to provide a hydrogen-based membrane bio-membrane reactor, which solves the problems in the prior art, can effectively increase the attachment area of microorganisms, enables the microorganisms to be uniformly attached, and can improve the biomass accumulation and enable the reactor to have higher anti-pollution load capacity.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a hydrogen-based membrane bio-membrane reactor, which comprises a mainstream reactor, a gas supply structure and a bucket, wherein the gas supply structure is used for containing hydrogen, the bucket is used for containing sewage to be treated, the mainstream reactor comprises a first reactor main body, a first dispersion membrane component is arranged in the first reactor main body, the first dispersion membrane component comprises a first fiber membrane bundle, the first fiber membrane bundle comprises a plurality of hollow fiber membranes, a gap is arranged between the hollow fiber membranes of the first dispersion membrane component, two ends of each hollow fiber membrane of the first dispersion membrane component respectively extend out of the first reactor main body, two ends of each hollow fiber membrane of the first dispersion membrane component are respectively communicated with the gas supply structure, the lower end of the first reactor main body is provided with a first inlet, the upper end of the first reactor main body is provided with a first outlet, the first inlet is communicated with the water barrel, and the first outlet is communicated with the water outlet valve.
Preferably, two ends of the first reactor main body are respectively provided with a first end cover, a first flange is arranged between each first end cover and the first reactor main body, the first flange is provided with a plurality of first through holes, each hollow fiber membrane of the first dispersion membrane module is arranged in each first through hole of the two first flanges in a penetrating manner, the outer sides of the two ends of the first fiber membrane bundle are respectively sleeved with a first sleeve, each first sleeve is respectively communicated with the gas supply structure, and each first sleeve is sealed with the corresponding first end cover.
Preferably, the hollow fiber membrane is made of PVC, and the side wall of the hollow fiber membrane is provided with a plurality of micropores.
Preferably, the hydrogen membrane bio-membrane reactor further comprises a side flow reactor, the side flow reactor comprises a main flow reactor body, a second dispersion membrane module is arranged in the main flow reactor body, the second dispersion membrane module comprises a second fiber membrane bundle, the second fiber membrane bundle comprises a plurality of hollow fiber membranes, a gap is arranged between each hollow fiber membrane of the second dispersion membrane module, and two ends of each hollow fiber membrane of the second dispersion membrane module respectively extend out of the main flow reactor body; two ends of each hollow fiber membrane of each second dispersion membrane component are respectively communicated with the gas supply structure, the lower end of the second reactor main body is provided with a second inlet, the upper end of the second reactor main body is provided with a second outlet, the second inlet is communicated with the first outlet, and the second outlet is respectively communicated with the first inlet and the water outlet valve.
Preferably, two ends of the second reactor main body are respectively provided with a second end cover, a second flange plate is arranged between each second end cover and the second reactor main body, the second flange plate is provided with a plurality of second through holes, each hollow fiber membrane of the second dispersion membrane module is arranged in each second through hole of the two second flange plates in a penetrating manner, the outer sides of the two ends of the second fiber membrane bundle are respectively sleeved with a second sleeve, each second sleeve is respectively communicated with the gas supply structure, and each second sleeve is sealed with the corresponding second end cover.
Preferably, a return pump is arranged on a pipeline between the second outlet and the first inlet, and a first sampling port is arranged on a pipeline between the second outlet and the first inlet.
Preferably, the cross section of the second reactor main body is rectangular, and the second reactor main body is made of quartz glass; and the second reactor main body is provided with a plurality of second sampling ports.
Preferably, a water inlet pump is arranged between the water bucket and the first inlet.
Preferably, a nitrogen bag is arranged on the water bucket and used for containing nitrogen.
Compared with the prior art, the invention has the following technical effects:
the invention can ensure that microorganisms are relatively uniformly attached, and meanwhile, compared with the traditional assembly form, the first dispersed membrane component greatly increases the effective attachment area, the biomass accumulation is relatively increased, the anti-pollution load capacity is higher, and the treatment performance of the hydrogen-based membrane bio-membrane reactor is improved. The invention can relatively simplify and control the thickness of the biological membrane, and utilizes the reactor to remove NO in the water body3 -The method has the characteristics of high-quality effluent and less loss of activated sludge strains, and can be widely applied to treatment of drinking water sources on the ground, underground and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a hydrogen-based membrane bio-membrane reactor of the present invention;
FIG. 2 is a schematic of a mainstream reactor of the invention;
FIG. 3 is a schematic view of a first flange of the present invention;
FIG. 4 is a schematic of a side-flow reactor of the present invention;
FIG. 5 is a schematic diagram of a hydrogen-based membrane bio-membrane reactor of the present invention connected in parallel with a conventional hydrogen-based membrane bio-membrane reactor;
FIG. 6 shows the inlet and outlet water NO of the hydrogen-based membrane bio-membrane reactor adopting the invention and the traditional hydrogen-based membrane bio-membrane reactor3 -A concentration dynamic graph;
FIG. 7 shows the inlet of hydrogen-based membrane bio-membrane reactor of the present invention and the conventional hydrogen-based membrane bio-membrane reactorNO of effluent2 -A concentration dynamic graph;
FIG. 8 is a VSS diagram of a hydrogen-based membrane bio-membrane reactor using the present invention and a conventional hydrogen-based membrane bio-membrane reactor.
Wherein: the system comprises a 100-hydrogen membrane biomembrane reactor, a 1-mainstream reactor, a 2-gas supply structure, a 3-water bucket, a 4-first reactor main body, a 5-hollow fiber membrane, a 6-first inlet, a 7-first outlet, an 8-water outlet valve, a 9-first end cover, a 10-first flange plate, a 11-first through hole, a 12-first sleeve, a 13-side flow reactor, a 14-second inlet, a 15-second outlet, a 16-second reactor main body, a 17-second end cover, a 18-second flange plate, a 19-second sampling port, a 20-water inlet pump, a 21-reflux pump, a 22-nitrogen bag, a 23-rubber plug, a 24-control group mainstream reactor and a 25-control group side flow reactor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a hydrogen-based membrane bio-membrane reactor, which solves the problems in the prior art, can effectively increase the attachment area of microorganisms, enables the microorganisms to be uniformly attached, and can improve the biomass accumulation and enable the reactor to have higher anti-pollution load capacity.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-4: the embodiment provides a hydrogen-based membrane bio-membrane reactor 100, which comprises a mainstream reactor 1, a gas supply structure 2 and a water barrel 3, wherein the gas supply structure 2 is used for containing hydrogen, the water barrel 3 is used for containing sewage to be treated or simulating water distribution, the mainstream reactor 1 comprises a first reactor main body 4,a first dispersion membrane component is arranged in the first reactor main body 4, the first dispersion membrane component comprises a first fiber membrane bundle, the first fiber membrane bundle comprises a plurality of hollow fiber membranes 5, and the hollow fiber membranes 5 are attachment carriers of microorganisms and H2The bubble-free diffusion medium comprises a first dispersion membrane assembly, wherein a gap is formed between hollow fiber membranes 5 of the first dispersion membrane assembly, two ends of each hollow fiber membrane 5 of the first dispersion membrane assembly respectively extend out of a first reactor main body 4, two ends of each hollow fiber membrane 5 of the first dispersion membrane assembly are respectively communicated with an air supply structure 2 so as to introduce hydrogen, a first inlet 6 is formed in the lower end of the first reactor main body 4, a first outlet 7 is formed in the upper end of the first reactor main body 4, the first inlet 6 is communicated with a water barrel 3, and the first outlet 7 is communicated with a water outlet valve 8. The hydrogen in the gas supply structure 2 enters the hollow fiber membranes 5 through the gas inlets at two ends of the hollow fiber membranes 5, enters the first reactor main body 4 in a bubble-free diffusion mode, is utilized by microorganisms on the outer surfaces of the hollow fiber membranes 5, and sewage enters the first reactor main body 4 through the first inlet 6 at the lower end of the first reactor main body 4, flows on the outer surfaces of the hollow fiber membranes 5, so that pollutants are in full contact reaction with the surfaces of the hollow fiber membranes 5, and then flows out through the first outlet 7 at the upper end of the first reactor main body 4. The embodiment can enable microorganisms to be attached uniformly relatively, meanwhile, compared with the traditional assembly mode, the effective attachment area is greatly increased by the distributed membrane module, the biomass accumulation is relatively increased, the pollution-resistant load capacity is higher, and the treatment performance of the hydrogen-based membrane bio-membrane reactor 100 is improved. The embodiment can relatively simplify the control of the thickness of the biofilm and remove NO in the water body by using the reactor3 -The method has the characteristics of high-quality effluent and less loss of activated sludge strains, and can be widely applied to treatment of drinking water sources on the ground, underground and the like.
Specifically, in the present embodiment, the hollow fiber membrane 5 is made of PVC (guangzhou sea filtration membrane technologies, ltd), and has a small membrane pore and a large specific surface area, the inner diameter of the hollow fiber membrane 5 is 0.8mm, the outer diameter of the hollow fiber membrane 5 is 1.66mm, the side wall of the hollow fiber membrane 5 is provided with a plurality of micropores, and the size of the micropores is 0.02 μm, so that hydrogen can be ensured to enter the first reactor main body 4 in a bubble-free diffusion manner.
In this example, the first reactor body 4 is a cylindrical glass cylinder having a diameter of 5 cm.
In this embodiment, two ends of the first reactor main body 4 are respectively provided with a first end cap 9, a first flange 10 is respectively arranged between each first end cap 9 and the first reactor main body 4, the first flange 10 and the first end cap 9 are connected by bolts, a plurality of first through holes 11 are uniformly formed in the first flange 10, each hollow fiber membrane 5 of the first dispersion membrane module is arranged in each first through hole 11 of the two first flanges 10 in a penetrating manner, the outer sides of two ends of the first fiber membrane bundle are respectively sleeved with a first sleeve 12, each first sleeve 12 is respectively communicated with a vent pipe of the gas supply structure 2 by a quick joint, and each first sleeve 12 is sealed with the corresponding first end cap 9 by epoxy resin glue.
In this embodiment, the hydrogen-based membrane bio-membrane reactor 100 further includes a side flow reactor 13, the side flow reactor 13 includes a mainstream reactor 1 including a second reactor main body 16, a second dispersion membrane module is disposed in the second reactor main body 16, the second dispersion membrane module includes a second fiber membrane bundle, the second fiber membrane bundle includes a plurality of hollow fiber membranes 5, a gap is disposed between each hollow fiber membrane 5 of the second dispersion membrane module, and two ends of each hollow fiber membrane 5 of the second dispersion membrane module respectively extend out of the second reactor main body 16; two ends of each hollow fiber membrane 5 of each second dispersion membrane component are respectively communicated with the gas supply structure 2, the lower end of the second reactor main body 16 is provided with a second inlet 14, the upper end of the second reactor main body 16 is provided with a second outlet 15, the second inlet 14 is communicated with the first outlet 7, and the second outlet 15 is respectively communicated with the first inlet 6 and the water outlet valve 8, so that the water flow of the side flow reactor 13 is ensured to be from bottom to top.
In this embodiment, two ends of the second reactor main body 16 are respectively provided with a second end cap 17, a second flange 18 is respectively arranged between each second end cap 17 and the second reactor main body 16, the second flange 18 and the second end cap 17 are connected by bolts, a plurality of second through holes are uniformly formed in the second flange 18, each hollow fiber membrane 5 of the second dispersion membrane module is inserted into each second through hole of the two second flanges 18, the outer sides of two ends of the second fiber membrane bundle are respectively sleeved with a second sleeve, each second sleeve is respectively communicated with the gas supply structure 2, and each second sleeve and the corresponding second end cap 17 are sealed by epoxy resin glue.
In this embodiment, a return pump 21 is disposed on the pipeline between the second outlet 15 and the first inlet 6 for uniformly mixing the liquid in the hydrogen-based membrane bio-membrane reactor 100, and a first sampling port is disposed on the pipeline between the second outlet 15 and the first inlet 6.
In this embodiment, the length of the second reactor main body 16 is 30cm, the cross section of the second reactor main body 16 is rectangular, preferably square with a side length of 3cm, and the second reactor main body 16 is made of quartz glass, so that the appearance and the appearance of the biofilm can be observed conveniently; a plurality of second sampling ports 19 are formed in the second reactor main body 16, preferably, 5 cylindrical second sampling ports 19 with the diameter of 2cm are symmetrically distributed on two sides of the second reactor main body 16, the second sampling ports 19 are used for in-situ monitoring of a microelectrode system, and rubber plugs 23 are plugged when the second sampling ports 19 are not used.
In this embodiment, the total effective volume of the hydrogen membrane bio-membrane reactor 100 is 0.952L.
In this embodiment, a water inlet pump 20 is disposed between the water tank 3 and the first inlet 6, and the water inlet pump 20 is a peristaltic pump (BT101L, refy).
In this embodiment, in order to ensure that the mainstream reactor 1 and the sidestream reactor 13 are always in an anoxic state, a nitrogen bag 22 is disposed on the water barrel 3 for supplementing nitrogen, and a sealing process is performed between the water barrel 3 and the nitrogen bag 22.
In the present embodiment, the spacing between the adjacent hollow fiber membranes 5 in the mainstream reactor 1 and the side-stream reactor 13 is set based on the general growth thickness of the biofilm of the microorganism, the mainstream reactor 1 includes 32 hollow fiber membranes 5, the side-stream reactor 13 includes 4 hollow fiber membranes 5, and the ratio of the size of the first reactor body 4 to the number of hollow fiber membranes 5 in the first reactor body 4 is equal to the ratio of the size of the second reactor body 16 to the number of hollow fiber membranes 5 in the second reactor body 16.
This example uses NaHCO3As inorganic nutrient substances (carbon sources) necessary for the growth of anaerobic microorganisms, NO in the wastewater is converted by the action of the hydrogen autotrophic denitrification microorganisms3 -The removal has the characteristics of low energy consumption, less loss of sludge strains, good effluent quality and the like;
the second reactor main body 16 of the side flow reactor 13 is made of quartz glass, so that the visibility is improved, the growth condition of microorganisms is convenient to observe, and meanwhile, the attachment of the microorganisms in the second reactor main body 16 is reduced;
the use of the first dispersion membrane component and the second dispersion membrane component in a dispersion type improves the anti-pollutant load capacity of the hydrogen-based membrane bio-membrane reactor 100, increases the accumulation of biomass, and improves the treatment performance of the reactor;
the first dispersive membrane component and the second dispersive membrane component of the embodiment can be applied to various membrane biofilm reactors, and have popularization significance.
Experimental examples:
as shown in fig. 5, in order to verify the effect of the hydrogen-based membrane biofilm reactor 100 of the present invention, a hydrogen-based membrane biofilm reactor using a conventional bundled membrane module is established as a control group, the control group is connected in parallel with the hydrogen-based membrane biofilm reactor 100 of the present invention, the bundled membrane module is used in the control group to replace the first and second dispersion membrane modules of the present invention, that is, each hollow fiber membrane 5 of the mainstream reactor 24 of the control group is bundled, each hollow fiber membrane 5 of the sidestream reactor 25 of the control group is bundled, and the rest structures are the same.
In general underground water, the C/N ratio is low, the components are complex, a large amount of oxysalt exists, in order to verify the feasibility of the hydrogen-based membrane biofilm reactor 100 in the invention, the denitrification performance of the hydrogen-based membrane biofilm reactor 100 is mainly considered, experimental water adopts simulated water distribution and is prepared according to the concentration of common ions in the underground water, and NO is NO3 -As target pollutant, SO4 2-As the coexisting oxidizing ion, NaHCO is used3Adding KH as carbon source2PO4+Na2HPO4The pH value of the inlet water is regulated and controlled to be 7.2 +/-0.2 by a buffer system; meanwhile, other microelements such as Fe, Mn, Zn and the like are added to meet the normal growth and metabolism of microorganisms. The simulated water distribution is stored in a 20L water barrel 3, nitrogen is introduced before the test to remove dissolved oxygen in water, and in order to ensure that the hydrogen-based membrane bio-membrane reactor 100 is in an anoxic environment, the water inlet barrel 3 is provided with a 30L nitrogen bag 22.
Domestication of hydrogen autotrophic denitrifying bacteria:
inoculating autotrophic denitrifying bacteria cultured in the early stage (the inoculated strains are bottom mud in a reactor normally operated in a laboratory, the MLVSS of the bottom mud is 0.865g/L, the reactor volume of the inoculum is 1/10, namely the inoculum sizes of the mainstream reactor 1 and the mainstream reactor 24 of the control group are 60mL, the inoculum sizes of the sidestream reactor 13 and the sidestream reactor 25 of the control group are 30mL, firstly shaking the sludge evenly by hand, then standing for 2h, taking supernatant liquid, adding the supernatant liquid into the mainstream reactor 1 and the sidestream reactor 13 of the hydrogen matrix membrane biofilm reactor 100 of the invention, the mainstream reactor 24 of the control group and the sidestream reactor 25 of the control group, and adding the supernatant liquid according to the volume ratio to ensure that the biological density in the early stage is consistent).
The hydrogen-based membrane bio-membrane reactor 100 of the invention is started to enter and exit water, and the control group enters and exits water and the gas supply structure 2. Full-speed water feeding, stopping water feeding after the water inlet and outlet and the control group of the hydrogen-based membrane bio-membrane reactor 100 are full, setting the water inlet flow to be 2mL/min, stopping the water pump after the water inlet and outlet and the control group of the hydrogen-based membrane bio-membrane reactor 100 are full, only starting the reflux pump 21 to carry out internal reflux, setting the reflux flow to be 100mL/min, setting the hydrogen pressure to be 0.02MPa, and setting the water inlet NO to be NO3 -The concentration of-N is 20mgN/L, the pH value is about 7.2, and the microorganism is domesticated. The water inlet and outlet of the hydrogen-based membrane bio-membrane reactor 100 and the control group are calculated from the beginning of filling, and internally circulated to the water inlet and outlet NO of the hydrogen-based membrane bio-membrane reactor 100 and the control group3 -And the-N concentration is reduced to about 0, and the water inlet pump 20 is started to normally operate. Until the removal flux of the nitrate and the nitrogen in the inlet and outlet water and the control group of the hydrogen-based membrane bio-membrane reactor 100 of the invention keeps stable, and a layer of yellowish-brown material visible to the naked eye is attached to the surface of the hollow fiber membrane 5, which is regarded as the completion of membrane hanging.
After the hydrogen membrane bio-membrane reactor 100 of the invention starts acclimatization of inlet and outlet water and a control group, the flow rate of inlet water is set to be 2mL/min, the reflux speed is 100mL/min, the hydrogen pressure is 0.02MPa, and NO is increased sequentially3 -N concentration until the removal rate is reduced in a 'cliff-type' manner, sampling is carried out after 3 HRTs are operated each time the concentration is changed, the initial setting and operation are carried out for 3 days in each stage, and the post-concentration is set to be 20 mgN/L.
The results show that:
in fig. 6, the dispersed effluent represents the effluent of the hydrogen matrix membrane bio-membrane reactor 100 according to the present invention, the bundled effluent represents the effluent of the control group, the dispersed removal rate represents the removal rate of the hydrogen matrix membrane bio-membrane reactor 100 according to the present invention, and the bundled removal rate represents the removal rate of the control group. In fig. 7, the dispersed effluent represents the effluent from the hydrogen membrane bio-membrane reactor 100 according to the present invention, and the concentrated effluent represents the effluent from the control group. In fig. 8, the dispersed membrane module represents the hydrogen membrane bio-membrane reactor 100 of the present invention, the bundled membrane module represents the control group, and the membrane filaments represent the hollow fiber membranes 5.
As shown in fig. 6, in the inlet water NO3 -When the concentration of-N is 5mg/L, the inlet and outlet water of the hydrogen membrane bio-membrane reactor 100 of the invention and the inlet and outlet water of the control group have better NO3 -N removal effect, the hydrogen-based membrane bio-membrane reactor 100 of the present invention has a removal rate of 96.84% -97.44%, and the control group removal rate of 83.66% -91.00%, but in contrast, the hydrogen-based membrane bio-membrane reactor 100 of the present invention is relatively stable to the removal of nitrate. NO with water inflow3 -The increase of the N concentration, the removal efficiency of the hydrogen-based membrane bio-membrane reactor 100 and the control group to nitrate gradually decreases, and in the process that the inlet water concentration is changed from 5mg/L to 20mg/L, the difference between the treatment capacities of the hydrogen-based membrane bio-membrane reactor 100 and the control group is increasingly large, the removal efficiency difference is changed from 5.84% to 56.14%, and in comparison, the removal performance of the hydrogen-based membrane bio-membrane reactor 100 decreases to about 90% from about 97%, and the removal performance of the control group decreases greatly from about 87%, and is reduced from about 87%The reduction is about 40%, thus showing that the hydrogen membrane bio-membrane reactor 100 of the invention is more stable and can resist larger nitrate load compared with the control group; meanwhile, in each concentration interval (10-40mg/L), the nitrate removal efficiency of the hydrogen-based membrane bio-membrane reactor 100 and the control group is correspondingly improved, the process is a stressful process which is caused by system microorganisms for adapting to the environment after the concentration of the nitrate is changed, the system tends to a new stable state, the change amplitude of the hydrogen-based membrane bio-membrane reactor 100 is smaller, and the microorganisms of the hydrogen-based membrane bio-membrane reactor 100 can adapt to the environment change more quickly; after the concentration of the nitrate in the inlet water is greater than 30mg/L, the difference between the removal performance of the hydrogen-based membrane bio-membrane reactor 100 of the invention and the removal performance of the control group begins to gradually decrease, but it is still better than the control group that the hydrogen-based membrane bio-membrane reactor 100 of the invention accumulates nitrite gradually (as shown in FIG. 7), and the accumulation of nitrite inhibits the removal of nitrate, which is one of the main reasons for the great removal performance of the hydrogen-based membrane bio-membrane reactor 100 of the invention after the concentration of the nitrate in the inlet water is greater than 30mg/L, compared with the control group, although the accumulation amount of nitrite is always kept around 0.2mg/L, which may be due to the poor denitrification capability, the system stability cannot be demonstrated, while the hydrogen-based membrane bio-membrane reactor 100 of the invention has a certain accumulation of nitrate, but keeps a decreasing trend in each concentration interval, the membrane bioreactor 100 can also keep higher denitrification capability under higher concentration, which also indicates that the membrane bioreactor 100 of the hydrogen-based membrane is superior to a control group; when the concentration of the nitrate in the inlet water is more than 50mg/L, the removal performance of the hydrogen-based membrane bio-membrane reactor 100 of the invention and the control group is equivalent, and is at a lower level, namely about 10%, which indicates that the difference of the membrane structures is no longer the main reason for the difference of the performance of the hydrogen-based membrane bio-membrane reactor 100 of the invention and the control group, and probably is caused by the limitation of the concentration of each substrate.
As shown in fig. 8, the VSS (volatile suspended matter, in the field of sewage treatment, the amount of volatile suspended matter is generally approximately expressed as biomass) of the hydrogen-based membrane bio-membrane reactor 100 of the present invention is higher than that of the control group as a whole, which shows that the hydrogen-based membrane bio-membrane reactor 100 of the present invention can accumulate more biomass during the same operation time; comparing the biomass of each single hollow fiber membrane 5, the VSS difference of each layer of hollow fiber membrane 5 of the hydrogen-based membrane bio-membrane reactor 100 of the invention is not large, which indicates that the growth vigor of microorganisms is relatively uniform, the VSS in the control group decreases gradually from outside to inside, comparing the outer layers VSS of the hydrogen-based membrane bio-membrane reactor 100 of the invention and the control group, the bio-membrane thickness of the outer layer of the hollow fiber membrane 5 in the control group is larger than that of the hollow fiber membrane 5 of the hydrogen-based membrane bio-membrane reactor 100 of the invention, which also indicates that the removal capability of the reactor to pollutants is affected by too thick bio-membrane; in conclusion, after the membrane module structure is improved, the reactor has higher capacity of resisting pollutant load, higher biomass accumulation and more uniform membrane hanging characteristics, the treatment performance of the reactor can be effectively improved, and the expected target is achieved.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A hydrogen-based membrane bio-membrane reactor is characterized in that: the hydrogen-containing wastewater treatment device comprises a mainstream reactor, a gas supply structure and a bucket, wherein the gas supply structure is used for containing hydrogen, the bucket is used for containing wastewater to be treated, the mainstream reactor comprises a first reactor main body, a first dispersion membrane assembly is arranged in the first reactor main body, the first dispersion membrane assembly comprises a first fiber membrane bundle, the first fiber membrane bundle comprises a plurality of hollow fiber membranes, a gap is arranged between each hollow fiber membrane of the first dispersion membrane assembly, two ends of each hollow fiber membrane of the first dispersion membrane assembly respectively extend out of the first reactor main body, two ends of each hollow fiber membrane of the first dispersion membrane assembly are respectively communicated with the gas supply structure, a first inlet is formed in the lower end of the first reactor main body, a first outlet is formed in the upper end of the first reactor main body, and the first inlet is communicated with the bucket, the first outlet is communicated with the water outlet valve.
2. A hydrogen-based membrane biofilm reactor according to claim 1, wherein: the two ends of the first reactor main body are respectively provided with a first end cover, a first flange plate is arranged between each first end cover and the first reactor main body, a plurality of first through holes are formed in the first flange plates, the hollow fiber membranes of the first dispersion membrane component penetrate through the first through holes of the two first flange plates, the outer sides of the two ends of the first fiber membrane bundle are respectively sleeved with a first sleeve, each first sleeve is communicated with the gas supply structure, and each first sleeve is sealed with the corresponding first end cover.
3. A hydrogen-based membrane biofilm reactor according to claim 1, wherein: the hollow fiber membrane is made of PVC, and a plurality of micropores are formed in the side wall of the hollow fiber membrane.
4. A hydrogen-based membrane biofilm reactor according to claim 1, wherein: the hydrogen-based membrane bio-membrane reactor also comprises a side flow reactor, wherein the side flow reactor comprises a main flow reactor and a second reactor main body, a second dispersion membrane component is arranged in the second reactor main body, the second dispersion membrane component comprises a second fiber membrane bundle, the second fiber membrane bundle comprises a plurality of hollow fiber membranes, a gap is arranged between the hollow fiber membranes of the second dispersion membrane component, and two ends of each hollow fiber membrane of the second dispersion membrane component respectively extend out of the second reactor main body; two ends of each hollow fiber membrane of each second dispersion membrane component are respectively communicated with the gas supply structure, the lower end of the second reactor main body is provided with a second inlet, the upper end of the second reactor main body is provided with a second outlet, the second inlet is communicated with the first outlet, and the second outlet is respectively communicated with the first inlet and the water outlet valve.
5. A hydrogen-based membrane biofilm reactor according to claim 4, wherein: the two ends of the second reactor main body are respectively provided with a second end cover, a second flange plate is arranged between each second end cover and the second reactor main body, a plurality of second through holes are formed in the second flange plates, the hollow fiber membranes of the second dispersion membrane module penetrate through the second through holes of the two second flange plates, the outer sides of the two ends of the second fiber membrane bundle are respectively sleeved with a second sleeve, each second sleeve is respectively communicated with the gas supply structure, and the second sleeve and the corresponding second end cover are sealed.
6. A hydrogen-based membrane biofilm reactor according to claim 4, wherein: a reflux pump is arranged on a pipeline between the second outlet and the first inlet, and a first sampling port is arranged on a pipeline between the second outlet and the first inlet.
7. A hydrogen-based membrane biofilm reactor according to claim 4, wherein: the section of the second reactor main body is rectangular, and the second reactor main body is made of quartz glass; and the second reactor main body is provided with a plurality of second sampling ports.
8. A hydrogen-based membrane biofilm reactor according to claim 1, wherein: and a water inlet pump is arranged between the water bucket and the first inlet.
9. A hydrogen-based membrane biofilm reactor according to claim 1, wherein: and a nitrogen bag is arranged on the water barrel and is used for containing nitrogen.
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