CN116040796A - Device and process for oxidizing treatment of nitrogen-containing wastewater by electric field coupling magnetite-enhanced anaerobic methane - Google Patents
Device and process for oxidizing treatment of nitrogen-containing wastewater by electric field coupling magnetite-enhanced anaerobic methane Download PDFInfo
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- 230000005684 electric field Effects 0.000 title claims abstract description 72
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 71
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000002351 wastewater Substances 0.000 title claims abstract description 20
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 230000008878 coupling Effects 0.000 title claims abstract description 10
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- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 58
- 239000007789 gas Substances 0.000 claims description 29
- 239000010802 sludge Substances 0.000 claims description 17
- 239000012528 membrane Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
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- 230000014759 maintenance of location Effects 0.000 claims description 6
- 229910002651 NO3 Inorganic materials 0.000 claims description 5
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- 238000002360 preparation method Methods 0.000 claims description 3
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- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 6
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- 241000195493 Cryptophyta Species 0.000 description 5
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- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 3
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- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
- C02F3/2893—Particular arrangements for anaerobic reactors with biogas recycling
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- C02F3/005—Combined electrochemical biological processes
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- 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
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/481—Treatment of water, waste water, or sewage with magnetic or electric fields using permanent magnets
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- C02F2201/48—Devices for applying magnetic or electric fields
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Abstract
The invention discloses a device and a process for treating nitrogen-containing wastewater by electric field coupling magnetite-enhanced anaerobic methane oxidation, wherein magnetite ore is processed, attached to a conductive carbon brush with iron concentration of 1g/L, and then placed into a bioreactor. The invention can achieve the following effects: the magnetite is coupled through the electric field, so that the microorganism abundance of the related denitrification function is increased, the electric activity of the microorganism is enhanced, a conductive biological film is formed, the electron transfer is quickened, the denitrification efficiency of the microorganism is improved, the permeability of the biological film can be changed through the action of the electric field, the expression of the related genes for methane oxidation is improved, and the nitrogen removal efficiency is improved. The process not only achieves the purpose of removing nitrogen, but also can achieve the purpose of removing methane at the same time, reduces greenhouse emissions, and has obvious environmental benefits. The process has the characteristics of low investment cost and high environmental protection benefit.
Description
Technical Field
The invention relates to equipment and a method for synchronously treating nitrogen-containing wastewater and methane.
Background
Nitrogen is an important nutrient for plants, mainly derived from human excreta and certain industrial wastewater, and is one of the main pollutants that cause eutrophication of certain slow-flowing water bodies. Meanwhile, many algae can secrete algae toxins to produce toxic effects on aquatic organisms and human health, and if people carelessly drink algae toxins produced by blue algae, the algae toxins can cause digestive tract inflammation. Methane is an important fossil fuel, but also a non-negligible greenhouse gas, and its contribution to the greenhouse effect is only inferior to carbon dioxide, reaching 20%, but its impact on global warming is 25 times that of carbon dioxide. Controlling methane concentration is of great importance in controlling global warming.
The traditional biological denitrification technology cannot avoid adding an external carbon source, but adding organic matters can not only lead to the increase of the operation cost, but also possibly lead to secondary pollution. The anaerobic digestion effluent of the sewage treatment plant often contains a large amount of soluble methane, if the effluent is not treated, the emission of greenhouse gases of the sewage treatment plant is caused, and if the effluent is to be collected, a series of processes such as stripping, collecting and purifying are needed, so that the treatment cost of the sewage treatment plant is increased, and the anaerobic methane oxidation process can use the soluble methane as a separate electron donor to reduce nitrate/nitrite, so that the simultaneous removal of methane during denitrification is realized. However, the functional microorganisms are difficult to enrich in the process, the multiplication time is long, and the electron transfer efficiency is low. Limiting the practical application of this technique.
The nature of microbial metabolism is electron transfer, the electron transfer rate between microorganisms determines the speed of microbial metabolism, the electron transfer between traditional microorganisms is considered as interspecific hydrogen transfer, namely, electron donor microorganisms oxidize organic matters and release electron carriers such as hydrogen/formic acid and the like, and then the hydrogen/formic acid is utilized by electron acceptor microorganisms, but the process has low transfer efficiency and is easy to be interfered by external environment, and then research finds that another electron transfer mode exists between microorganisms, namely, direct inoculation of the electron transfer mode is realized, and the electron donor microorganisms oxidize the organic matters and simultaneously directly transfer electrons to the electron acceptor microorganisms through proteins with electron transfer capacity, so that the electron transfer efficiency between the microorganisms is greatly improved, and the microbial metabolism speed is improved. The electric field is an effective means for regulating the growth and metabolism of microorganisms, and after the electric field is applied to the bioreactor, the ATP content of the microorganisms can be changed, the metabolism can be accelerated, the permeability of the biological film and the redox sites can be increased, and the microbial growth and micro-ecological environment can be changed. The electric field can also enrich electroactive bacteria, participate in the DIET process among microorganisms, magnetite is a mineral widely used in the nature, can enrich bacteria with conductive pili, participate in electron transfer among direct inoculation of microorganisms, adhere magnetite to a conductive carbon brush, can play a synergistic effect with the electric field, and can accelerate electron transfer among microorganisms and improve nitrogen removal in a bioreactor while changing the microbial growth micro-ecological environment.
Disclosure of Invention
In order to solve the problems of low denitrification efficiency in the anaerobic methane oxidation treatment process of nitrogen-containing wastewater, difficult growth of functional microorganisms in the process, long multiplication time and the like, the invention provides the following technical scheme: a device for treating nitrogen-containing wastewater by electric field coupling magnetite-enhanced anaerobic methane oxidation comprises an electric field reactor cylinder provided with a constant temperature heat preservation layer. The electric field bioreactor cylinder is sequentially provided with an electric field bioreactor base, a carbon rod electrode, a conductive carbon brush, an electric field bioreactor upper cover, a gas collecting device and a direct current power supply from bottom to top. One end of the electric field bioreactor water inlet pump is connected with the pipe i and the water inlet tank, and the other end is connected with the right end of the lower side of the electric field bioreactor through the valve i. The water outlet tank is connected with the left end of the upper side of the electric field bioreactor through a pipe ii and a valve ii. The thermostatic water bath is connected with the left end of the lower side of the thermostatic heat preservation layer through a pipe iii and a valve iii, the right end of the upper side of the thermostatic heat preservation layer is connected with the thermostatic water bath through a pipe iv and a valve iv, and the water outlet pump of the thermostatic water bath is connected with the thermostatic water bath. The gas cylinder filled with high purity methane is connected with a gas flowmeter through a pipe v and enters the water inlet tank through a valve v. The conductive carbon brush loaded with magnetite passes through the upper cover of the electric field bioreactor through a lead i to be connected with a direct current power supply as a biological anode. And the lead ii is connected with the carbon rod through a direct current power supply and the upper cover of the bioreactor and is used as a biological cathode. The gas generated by the electric field bioreactor is connected with a gas collecting device through a valve vi and a pipe vi. A process for strengthening anaerobic methane oxidation treatment of nitrogen-containing wastewater by utilizing the device is characterized by comprising the following steps of: the method comprises the following steps:
1) An electric field bioreactor having a volume of 700ml uses digested sludge from an anaerobic sludge fermenter as a starter sludge, with a sludge concentration (MLSS) of 15-20g/L and an optimal sludge concentration of 18g/L.
2) The preparation method of the added magnetite is as follows; 32mmol of ferric chloride and 15mmol of ferrous chloride were dissolved in 25mL of a dilute hydrochloric acid solution having a concentration of 0.4 mol/L. 250mL of 1.5mol/L NaOH solution was added dropwise at a rate of 2mL/h and stirred rapidly. After the dripping is finished, the black precipitate generated by the attraction of the magnet is agglomerated at the bottom of the beaker, the supernatant is discarded, the anaerobic water is added for full stirring, the mixture is uniformly mixed, and the mixture is packaged into a 50mL sterile centrifuge tube. Centrifugation at 6000rpm for 8min, supernatant was discarded and repeated three times. Adding 500mL of 0.01 into magnetite colloid after centrifugation
The supernatant was discarded after 8min of separation at 6000rpm with mol/L dilute hydrochloric acid.
3) Resuspension is carried out on the prepared magnetite by using oxygen-free water, so that the iron concentration of the solution after resuspension is 1g/L, then a conductive carbon brush with the length of 15cm and the diameter of 3cm is soaked in the solution for 12-15h, the optimal time is 14h, and the magnetite is uniformly stirred, so that the magnetite is uniformly loaded on the conductive carbon brush.
4) And (3) enabling the conductive carbon brush loaded with magnetite to penetrate through an upper cover of the bioelectric field reactor to be connected with a positive electrode of a direct current power supply, and placing the conductive carbon brush loaded with magnetite into the electric field bioreactor to serve as a bioanode. The carbon rod with the length of 15cm and the diameter of 1.5cm is connected with the negative electrode of the direct current power supply, passes through the upper cover of the bioelectric field reactor and is placed into the bioelectric field reactor to be used as a bioelectrode.
5) Before each water inlet to the electric field bioreactor, the gas flowmeter is opened for 30-45min, and the optimal time is 42min. Methane is led to enter the water inlet tank through a pipe v, and the flow rate of methane gas is controlled to be 10-15mL/min. The optimal flow rate is 10mL/min.
6) The electric field bioreactor water inlet pump is turned on, nitrate-containing wastewater enters the membrane bioreactor from the water inlet tank through the pipe i and the valve i, and then enters the water outlet tank through the pipe ii and the valve ii.
7) The temperature in the electric field bioreactor cylinder is controlled between 28 ℃ and 30 ℃ and the optimal temperature is 30 ℃. The pH in the barrel of the membrane bioreactor is controlled to be 7.0-7.2, and the optimal pH is 7.2. The hydraulic retention time of the membrane bioreactor is controlled to be 21-23h, and the optimal hydraulic retention time is 22h.
8) The gas generated by the electric field bioreactor reaction enters the gas collecting device through the valve vi and the pipe vi.
The device and the process for strengthening anaerobic methane oxidation treatment of nitrogen-containing wastewater based on electric field coupling magnetite are characterized in that: the growth metabolism of the microorganisms is regulated by the electric field, the growing micro-ecological environment is changed, the electro-active bacteria are enriched, and the electro-active bacteria participate in the electron transfer between the direct inoculation of the microorganisms. In addition, the process simulates the real anaerobic digestion effluent, uses the dissolved methane as an electron donor, and provides a new thought and a new method for treating the dissolved methane in the effluent of the anaerobic end of the sewage treatment plant and reducing the emission of greenhouse gases. The process has the characteristics of low investment cost and high environmental protection benefit.
Description of the drawings:
FIG. 1 is a schematic diagram of an apparatus and process for treating nitrogen-containing wastewater by electric field coupling magnetite-enhanced anaerobic methane oxidation.
In the figure: 1. the water inlet tank, 2, pipe i,3, valve i,4, pipe iv,5, valve iv,6, biological cathode, 7, gas collector, 8, pipe vi,9, valve vi,10, wire i,11, direct current power supply, 12, wire ii,13, biological anode, 14 electric field bioreactor upper cover, 15, valve ii,16, constant temperature heat preservation layer, 17, constant temperature water bath water outlet pump, 18, pipe ii,19, water outlet tank, 20, valve iii,21, constant temperature water bath water inlet pump, 22, pipe iii,23, constant temperature water bath, 24, methane gas bottle, 25, pipe v,26, flowmeter, 27, valve v,28, electric field bioreactor base, 29, electric field bioreactor, 30, electric field bioreactor water inlet pump.
FIG. 2 is a schematic diagram of an apparatus and process denitrification effect for electric field coupled magnetite-enhanced anaerobic methane oxidation treatment of nitrogen-containing wastewater.
Detailed Description
The application mechanism of the device and the technology for the electric field coupling magnetite reinforced anaerobic methane oxidation treatment of nitrogen-containing wastewater is as follows:
1. direct electron transfer between microorganisms is a highly efficient electron transfer process that can directly transfer electrons between microorganisms without the need for intermediate products such as hydrogen and formic acid.
2. After the bioreactor applies an electric field, the ATP content of microorganisms can be changed, metabolism is quickened, the permeability and redox sites of the biological film are increased, and the microbial growth microecological environment is changed. And the electric field can also enrich electroactive bacteria and participate in the DIET process between microorganisms.
3. The magnetite is attached to the conductive carbon brush, so that a synergistic effect can be exerted with an electric field, the micro-ecological environment for microorganism growth is changed, meanwhile, electron transfer between microorganisms is quickened, and nitrogen removal in the bioreactor is improved.
4. Based on the synergistic effect of the electric field and magnetite, the magnetite is loaded on a conductive carbon brush, and under the action of a micro-electric field, a direct inter-inoculation electron transfer process between microorganisms is constructed, so that nitrogen reduction is accelerated.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1; the device for oxidizing treatment of nitrogen-containing wastewater by the electric field coupling magnetite-enhanced anaerobic methane has the following technical characteristics: an electric field reactor cylinder 29 provided with a constant temperature heat preservation layer 16 is provided, and the electric field bioreactor cylinder is provided with an electric field bioreactor base 28, a carbon rod electrode 6, a conductive carbon brush 13, an electric field bioreactor upper cover 14, a gas collecting device 7 and a direct current power supply 11 from bottom to top in sequence. One end of the electric field bioreactor water inlet pump 30 is connected with the pipe i-2 and the water inlet tank 1, and the other end is connected with the right end of the lower side of the electric field bioreactor through the valve i-3. The water outlet tank is connected with the left end of the upper side of the electric field bioreactor through a pipe ii-18 and a valve ii-15. The thermostatic waterbath 23 is connected with the left end of the lower side of the thermostatic heat preservation layer through a pipe iii-22 and a valve iii-20, the water inlet pump 21 of the thermostatic waterbath is connected with the right end of the upper side of the thermostatic heat preservation layer through a pipe iv-4 and a valve iv-5, and the water outlet pump 17 of the thermostatic waterbath is connected with the thermostatic waterbath 23. The gas cylinder containing high purity methane 24 is connected to a gas flow 26 meter via a pipe v-25, through a valve v-27 into the intake tank 1. The conductive carbon brush 13 loaded with magnetite passes through the upper cover 14 of the electric field bioreactor through the lead i-10 and is connected with the direct current power supply 11 to serve as a biological anode. And the leads ii-12 are connected with the carbon rod 6 through the direct current power supply 11 and the upper cover 14 of the bioreactor to serve as a biological cathode. The gas generated by the electric field bioreactor is connected with the gas collecting device 7 through a valve vi-9 and a pipe vi-8.
The process for treating nitrogen-containing wastewater by denitrification anaerobic methane oxidation by using the device comprises the following specific operation procedures: an electric field bioreactor having a volume of 700ml uses digested sludge from an anaerobic sludge fermenter as starter sludge with a sludge concentration (MLSS) of 15-20g/L. The optimal sludge concentration is 18g/L.
The preparation method of the added magnetite is as follows: 32mmol of ferric chloride and 15mmol of ferrous chloride were dissolved in 25mL of a dilute hydrochloric acid solution having a concentration of 0.4 mol/L. 250mL of 1.5mol/L NaOH solution was added dropwise at a rate of 2mL/h and stirred rapidly. After the dripping is finished, the black precipitate generated by the attraction of the magnet is agglomerated at the bottom of the beaker, the supernatant is discarded, the anaerobic water is added for full stirring, the mixture is uniformly mixed, and the mixture is packaged into a 50mL sterile centrifuge tube. Centrifugation at 6000rpm for 8min, supernatant was discarded and repeated three times. 500mL of 0.01mol/L dilute hydrochloric acid is added into the magnetite colloid after centrifugation, and supernatant is removed after separation for 8min at 6000 rpm.
Resuspension is carried out on the prepared magnetite by using oxygen-free water, so that the iron concentration of the solution after resuspension is 1g/L, then a conductive carbon brush with the length of 15cm and the diameter of 3cm is soaked in the solution for 12-15h, the optimal soaking time is 13h, and the magnetite is uniformly stirred, so that the magnetite is uniformly loaded on the conductive carbon brush.
And (3) enabling the conductive carbon brush loaded with magnetite to penetrate through an upper cover of the bioelectric field reactor to be connected with a positive electrode of a direct current power supply, and placing the conductive carbon brush loaded with magnetite into the electric field bioreactor to serve as a bioanode. The carbon rod with the length of 15cm and the diameter of 1.5cm is connected with the negative electrode of the direct current power supply, passes through the upper cover of the bioelectric field reactor and is placed into the bioelectric field reactor to be used as a bioelectrode.
Before each water inlet to the electric field bioreactor, the gas flowmeter is opened for 30-45min, and the optimal time is 42min. Allowing methane to pass through a pipe v, and allowing a valve v to enter a water inlet tank, wherein the flow rate of methane gas is controlled to be 10-15mL/min; the optimal flow rate is 10mL/min.
The electric field bioreactor water inlet pump is turned on, nitrate-containing wastewater enters the membrane bioreactor from the water inlet tank through the pipe i and the valve i, and then enters the water outlet tank through the pipe ii and the valve ii.
The temperature in the electric field bioreactor cylinder is controlled between 28 ℃ and 30 ℃ and the optimal temperature is 30 ℃. The pH in the barrel of the membrane bioreactor is controlled to be 7.0-7.2, and the optimal pH is 7.2. The hydraulic retention time of the membrane bioreactor is controlled to be 21-23 hours, and the optimal hydraulic retention time is 22 hours.
The gas generated by the electric field bioreactor reaction enters the gas collecting device through the valve vi and the pipe vi.
Example 1:
an electric field bioreactor with the effective volume of 700mL is adopted to inoculate sludge in an anaerobic fermentation tank, so that the concentration of the sludge in the reactor is 16g/L. Applying anode voltage of 1V, and feeding water into the artificial simulated nitrogenous wastewater, wherein NO 3 - The concentration of N is 50mg/L, pH and 7.0-7.2, and the concentration of the dissolved methane in the artificial simulated wastewater is 18mg/L. The temperature of the insulating layer of the membrane bioreactor is 30 ℃, and the hydraulic retention time is 23 hours. As shown in FIG. 2, the nitrate removal rate of the electric field coupling magnetite reactor is 43%, which is improved by 1.7 times compared with that of a blank reactor.
Claims (2)
1. The device for treating nitrogen-containing wastewater by electric field coupling magnetite-enhanced anaerobic methane oxidation comprises an electric field reactor cylinder (29) provided with a constant temperature insulating layer (16), wherein an electric field bioreactor base (28), carbon rod electrodes (6), conductive carbon brushes (13), an electric field bioreactor upper cover (14), a gas collecting device (7) and a direct current power supply (11) are sequentially distributed on the electric field bioreactor cylinder from bottom to top; one end of a water inlet pump (30) of the electric field bioreactor is connected with the pipe i (2) and the water inlet tank (1), and the other end of the water inlet pump is connected with the right end of the lower side of the electric field bioreactor through the valve i (3); the water outlet tank is connected with the left end of the upper side of the electric field bioreactor through a pipe ii (18) and a valve ii (15); the constant-temperature water bath (23) is connected with the left end of the lower side of the constant-temperature heat preservation layer through a pipe iii (22), a valve iii (20), a constant-temperature water bath water inlet pump (21), the right end of the upper side of the constant-temperature heat preservation layer is connected with the constant-temperature water bath (23) through a pipe iv (4), a valve iv (5) and a constant-temperature water bath water outlet pump (17); the gas cylinder filled with high-purity methane (24) is connected with a gas flow meter (26) through a pipe v (25) and enters the water inlet tank (1) through a valve v (27); the conductive carbon brush (13) loaded with magnetite is connected with a direct current power supply (11) through a lead i (10) and penetrates through an upper cover (14) of the electric field bioreactor to serve as a biological anode; the lead ii (12) is connected with the carbon rod (6) through the direct-current power supply (11) and the upper cover (14) of the bioreactor and is used as a biological cathode; the gas generated by the electric field bioreactor is connected with a gas collecting device (7) through a valve vi (9) and a pipe vi (8).
2. An anaerobic biological process for treating nitrogen-containing wastewater using the apparatus of claim 1 comprising the following specific operations:
1) An electric field bioreactor (29) with a volume of 700ml uses digested sludge from an anaerobic sludge fermenter as starter sludge, the sludge concentration (MLSS) is 15-20g/L, the optimal sludge concentration is 18g/L;
2) The preparation method of the added magnetite is as follows: 32mmol of ferric chloride and 15mmol of ferrous chloride are dissolved in 25mL of dilute hydrochloric acid solution with the concentration of 0.4 mol/L; 250mL of 1.5mol/L NaOH solution is added dropwise at the speed of 2mL/h, and the mixture is stirred rapidly; after the dripping is finished, the black precipitate generated by the attraction of the magnet is agglomerated at the bottom of the beaker, the supernatant is discarded, and the anaerobic water is added for full stirring, uniform mixing and split charging to a 50mL sterile centrifuge tube; centrifuging at 6000rpm for 8min, discarding supernatant, repeating for three times, adding 500mL of 0.01mol/L dilute hydrochloric acid into the magnetite colloid after centrifugation, and centrifuging at 6000rpm for 8min, discarding supernatant;
3) Re-suspending the prepared magnetite by using oxygen-free water to ensure that the iron concentration of the re-suspended solution is 1g/L, soaking a conductive carbon brush with the length of 15cm and the diameter of 3cm in the solution for 12-15h, optimally for 14h, and uniformly stirring to ensure that the magnetite is uniformly loaded on the conductive carbon brush (13);
4) The conductive carbon brush (13) loaded with magnetite passes through the upper cover (14) of the bioelectric field reactor to be connected with the positive electrode of the direct current power supply (11), and is placed into the electric field bioreactor (29) to be used as a bioanode; a carbon rod (6) with the length of 15cm and the diameter of 1.5cm is connected with the negative electrode of a direct current power supply (11), passes through an upper cover (14) of the bioelectric field reactor and is placed into a bioelectric field reactor (29) to serve as a bioelectrode;
5) Before each water inflow to the electric field bioreactor, opening a gas flowmeter (26) for 30-45min, wherein the optimal time is 42min;
passing methane through a pipe v (25), a valve v (27) into the water inlet tank (1), and controlling the flow rate of methane gas to be 10-15mL/min;
the optimal flow rate is 10mL/min;
6) Starting an electric field bioreactor water inlet pump (30), enabling nitrate-containing wastewater to enter the membrane bioreactor (29) from a water inlet tank through a pipe i (2), enabling a valve i (3) to enter a water outlet tank (19) through a pipe ii (18), and enabling a valve ii (15) to enter the water outlet tank;
7) The temperature in the electric field bioreactor cylinder (16) is controlled to be 28-30 ℃ and the optimal temperature is 30 ℃; the pH in the barrel of the membrane bioreactor is controlled to be 7.0-7.2, and the optimal pH is 7.2; the hydraulic retention time of the membrane bioreactor is controlled to be 21-23h; the optimal water conservancy residence time is 22h;
8) The gas generated by the electric field bioreactor reaction enters the gas collecting device (7) through the valve vi (9) and the pipe vi (8).
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| WO2005115930A1 (en) * | 2004-05-26 | 2005-12-08 | National Research Council Of Canada | Bioelectrolytical methanogenic/methanotrophic coupling for bioremediation of ground water |
| CN105731640A (en) * | 2016-03-21 | 2016-07-06 | 浙江大学 | Magnetite-enhanced biological electrode coupled UASB (upflow anaerobic sludge bed/blanket) apparatus and operation method |
| CN112062271A (en) * | 2020-09-17 | 2020-12-11 | 重庆大学 | Bio-electrochemical reaction device and method for denitrifying anaerobic methane oxidation film |
| CN113003717A (en) * | 2021-03-11 | 2021-06-22 | 大连理工大学 | Device and process for enhancing denitrification anaerobic methane oxidation denitrification based on magnetite |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005115930A1 (en) * | 2004-05-26 | 2005-12-08 | National Research Council Of Canada | Bioelectrolytical methanogenic/methanotrophic coupling for bioremediation of ground water |
| CN105731640A (en) * | 2016-03-21 | 2016-07-06 | 浙江大学 | Magnetite-enhanced biological electrode coupled UASB (upflow anaerobic sludge bed/blanket) apparatus and operation method |
| CN112062271A (en) * | 2020-09-17 | 2020-12-11 | 重庆大学 | Bio-electrochemical reaction device and method for denitrifying anaerobic methane oxidation film |
| CN113003717A (en) * | 2021-03-11 | 2021-06-22 | 大连理工大学 | Device and process for enhancing denitrification anaerobic methane oxidation denitrification based on magnetite |
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