CN112573655A - VSFW reaction equipment with synchronous denitrification, electrogenesis and rapid enrichment of microbial fuel cells - Google Patents
VSFW reaction equipment with synchronous denitrification, electrogenesis and rapid enrichment of microbial fuel cells Download PDFInfo
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- CN112573655A CN112573655A CN202011102580.7A CN202011102580A CN112573655A CN 112573655 A CN112573655 A CN 112573655A CN 202011102580 A CN202011102580 A CN 202011102580A CN 112573655 A CN112573655 A CN 112573655A
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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
- C02F3/30—Aerobic and anaerobic processes
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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
- C02F3/005—Combined electrochemical biological processes
Abstract
The invention relates to a sewage treatment device, in particular to an artificial wetland reaction device which is suitable for a denitrification process to quickly enrich denitrification denitrifying bacteria and electrochemical active bacteria. The invention discloses a VSFW reaction device of a synchronous denitrification electrogenesis rapid enrichment microbial fuel cell, which is connected with a carbon source water inlet pump and mainly comprises an aerobic section and an anaerobic section; an anaerobic section: a carbon source water inlet pump is connected with a water inlet pipe and pumps the carbon source water inlet pump into the VSFW reactor; an aerobic section: the electric ball valve is connected with a water outlet pump through a water outlet pipe to pump out water. The invention uses the oxidation-reduction potential gradient in the system to selectively proliferate the microorganism, and can fully separate the electron donor from the electron acceptor. The up-flow operation mode can avoid oxygen in the cathode from diffusing to the anode to influence the enrichment of the anode electrogenesis bacteria. The device has the advantages of stable operation, reduction of additional organic carbon source and aeration cost, less residual sludge, high microorganism abundance, realization of rapid enrichment of denitrifying denitrogenation bacteria and electrochemical active bacteria and the like.
Description
Technical Field
The invention belongs to the field of water pollution control, and relates to VSFW (vacuum assisted pyrolysis) reaction equipment of a synchronous denitrification electrogenesis rapid enrichment microbial fuel cell.
Background
With the continuous development of society, the content of nitrogen and phosphorus in industrial and agricultural wastewater and urban domestic sewage is higher and higher. A large amount of nitrogen and phosphorus sewage which is not properly treated is directly discharged into a water body, so that a large amount of water body environment eutrophication is seriously caused, the health of human beings is threatened, and the sustainable development of the society is also seriously restricted. Various sewages have high content of phosphorus and nitrogen elements, and the C/N/P ratio is disordered under most conditions, thereby bringing about a plurality of difficulties for the harmless treatment of the sewage.
The traditional biological nitrogen and phosphorus removal method has a certain effect on sewage treatment and still has a plurality of bottlenecks. Such as: competition of phosphorus accumulating bacteria and denitrifying bacteria for carbon sources always exists; the nitrifying bacteria, the denitrifying bacteria and the phosphorus-accumulating bacteria have different ages, and various bacteria are mixed together and mutually restricted, so that the system is difficult to reach the optimal operation condition; for sewage with disordered C/N/P ratio, an organic carbon source is additionally added; the aerobic biological phosphorus removal process increases power consumption and can generate a large amount of excess sludge; the whole treatment process has the advantages of longer flow, large occupied area, high investment and the like.
With the continuous improvement of sewage treatment technology, several novel biological nitrogen and phosphorus removal processes have been developed and applied in recent years, mainly including: the synchronous nitrification and denitrification process, the short-cut nitrification and denitrification process, the anaerobic ammonia oxidation process, the completely autotrophic nitrogen removal process, the denitrification and phosphorus removal process and the microbial fuel cell type artificial wetland process have the advantages of low energy consumption, reduction of additional organic carbon sources, small residual sludge yield, small occupied area and the like. In particular, the microbial fuel cell type artificial wetland process realizes the two processes of denitrification and power generation synchronously in the same reactor. The process not only reduces the need of carbon source, but also reduces the energy source needed by aeration by utilizing the air cathode, and the amount of the generated residual sludge is greatly reduced. Therefore, the microbial fuel cell type artificial wetland technology has become one of the key points and hot spots in the research field of sewage dephosphorization and denitrification at present. However, how to maintain the advantages of the electroactive bacteria and realize the long-term high-efficiency operation of denitrification and denitrification power generation becomes a problem to be solved in the research field.
Aiming at the situation, research and development of novel reaction equipment and a novel technology which have the advantages of simple structure, low consumption, high efficiency, easy operation and management, stable operation, capability of realizing the rapid enrichment of electroactive bacteria, realizing the denitrification and electrogenesis for a long time, maintaining the activity of electrogenic bacteria and keeping the advantages of denitrification functional microorganisms become an inevitable way for the development of the denitrification and dephosphorization treatment of sewage.
Disclosure of Invention
The invention aims to provide a microbial fuel cell type VSFW reaction equipment capable of rapidly enriching denitrifying bacteria and electroactive bacteria for a denitrifying denitrification process.
The technical scheme of the invention is that the VSFW reaction equipment of the microbial fuel cell type is synchronously denitrified, generates electricity and quickly enriches, is connected with a carbon source water inlet pump and mainly comprises an aerobic section and an anaerobic section;
an anaerobic section: a carbon source water inlet pump is connected with a water inlet pipe and pumps the carbon source water inlet pump into the VSFW reactor;
an aerobic section: the electric ball valve is connected with a water outlet pump through a water outlet pipe to pump out water;
the aerobic section is provided with a graphite felt anode, the anaerobic section is provided with a graphite plate cathode, a resistor is externally connected between the aerobic section and the anaerobic section, and electroactive microorganisms are rapidly enriched in the VSFW reactor;
the bottom is provided with a perforated supporting plate and an emptying pipe.
The side wall of the two-section reactor is provided with 5 sampling tubes.
Graphite felt electrodes are used, graphite plate electrodes are used as cathodes, and the two electrodes are horizontally placed in the cylindrical reactor.
A water bath heat-insulating layer is added and is connected with a heating device on the outer surface of the reactor by a temperature controller
The invention selectively breeds microorganisms by using the oxidation-reduction potential gradient in the system to realize the rapid enrichment of electroactive bacteria. The up-flow operation mode can avoid oxygen in the cathode from diffusing to the anode to influence the enrichment of the anode electrogenesis bacteria. In addition, the nutrient load of the inlet water is increased, the proliferation speed of bacteria can be accelerated, and finally, the system achieves good denitrification effect. The invention has the advantages of rapid enrichment of electroactive bacteria, simple and stable operation, high volume utilization rate, high microorganism abundance, no need of aeration, less residual sludge, no need of alkalinity adjustment, lower operation cost and the like.
Compared with the prior art, the invention has the following advantages:
1. the rapid enrichment of the electroactive bacteria is realized, and the rapid starting and stable operation of the novel microbial fuel cell type artificial wetland denitrification process for treating the high-carbon-ratio sewage and the urban sewage are realized. The invention utilizes the oxidation-reduction potential gradient in the system to selectively proliferate microorganisms, thereby realizing the rapid enrichment of denitrifying denitrogenation bacteria and electroactive bacteria. On one hand, the method can fully separate a carbon source (electron donor) from a nitrate (electron acceptor), can avoid competition between other floras to the electron donor and the electron acceptor, enables the electroactive bacteria to obtain competitive advantages in an anaerobic anode section, enables the electroactive bacteria to selectively increase the value of the population in the system, on the other hand, can also improve the nutrient load of inlet water, accelerates the proliferation speed of bacteria, and finally enables the system to achieve a good denitrification effect.
2. The additional organic carbon source, the aeration amount and the residual sludge discharge amount are reduced, and the operation cost is reduced. The two processes of denitrification and electrogenesis in the equipment can be simultaneously finished only under the anoxic condition, so that the requirement of microorganisms on a carbon source is reduced, the yield of residual sludge is reduced, and the consumption of aeration can be reduced when denitrification and electrogenesis are finished under the anoxic condition.
Drawings
FIG. 1 is a block diagram of the present invention. The details are shown in the attached drawings of the specification.
Detailed Description
The device comprises a microbial fuel cell type VSFW reactor 1, a carbon source water inlet pump 2, a water inlet pipe 3, a graphite felt anode 4, a graphite plate cathode 5, an external resistor 6, a sampling pipe 7, a water discharge pipe 8, an electric ball valve 9, a water outlet pump 10, a water bath heat insulation layer 10-1, a water bath device water outlet pipe 10-2, a water bath device water inlet pipe 11, a temperature controller 12, a heating device 13, a perforated support plate 14 and an emptying pipe. In the operation process of the equipment, carbon source sewage is pumped into a water inlet at the bottom of the equipment through a water inlet pump, and after the reaction is finished, water is discharged from a water outlet of the equipment through a water outlet pump finally. The gas generated by the apparatus is discharged from the top.
The invention is provided with a VSFW-MFC reaction unit of an anaerobic/aerobic section, which operates in a sequencing batch mode. 1 time of water feeding and 1 time of water discharging are carried out in each period. The specific operation mode is as follows: after water is fed from the bottom of the device by the carbon source water inlet tank, organic matters are fully degraded in the anode area at the lower end, and at the moment, electroactive bacteria are quickly enriched at the anode. The hydraulic retention time of the system is controlled to be about 1.5 d. The side wall of the device is provided with a sampling tube, the whole reactor is heated by a water bath device on the surface of the reactor, and the temperature of the reactor is kept at a constant temperature of 30 +/-1 ℃ by a temperature controller.
Auxiliary part of the invention
1. Sludge discharge device
The treatment effect is enhanced with the increase of the sludge concentration in the reactor, but after the sludge exceeds a certain concentration, the excess sludge is removed to optimize the effluent effect. Therefore, the equipment periodically discharges the sludge with low activity at regular intervals, and retains the sludge with high activity in the reactor. The invention arranges an emptying pipe at the bottom of the microbial fuel cell type VSFW reaction device, and can be used as a filler sample sampling port.
2. Heating and insulating facility
In view of the fact that the denitrifying denitrifier has the best microbial activity under the condition of medium temperature, a water bath device is arranged on the surface of the reactor to heat, and a temperature controller is used for maintaining the temperature of the system within the range of 30 +/-1 ℃. Start-up and steady operation portions of the present invention
1. Starting of the apparatus
The reactor is inoculated with the activated sludge of the municipal sewage plant with a certain concentration, and then the water feeding operation is started. The equipment is started and operated by adopting artificial simulation sewage to reduce the influence of other factors, and the key parameter control conditions for realizing the rapid enrichment of denitrifying denitrobacteria and electroactive bacteria and the key parameter control conditions for ensuring the advantages of denitriding functional strain groups and maintaining the activity of the electroactive bacteria in stable operation are proved.
2. Determining effluent index monitoring process parameters and regulating engineering in the running process of equipment.
The items to be monitored and controlled during operation are mainly shown in table 1.
TABLE 1 Main analysis items and analysis methods
As can be seen from the above table, wherein: COD and NO3 --N、NO2 --N、PO4 3-Parameters such as-P, TN, TP and total gas production amount can reflect the enrichment effect and the running state of denitrifying denitrifier, pollutants (especially nitrogen) and the change condition along with the control condition. MLSS, SV and SVI can preliminarily judge the change of the sedimentation performance of the sludge in the equipment along with the control condition and the form and structure composition of the sludge under the condition of denitrifying denitrogenation bacteria enrichment. The operation state of the reaction equipment can be optimized by regulating and controlling parameters such as pH value, alkalinity, oxidation-reduction potential (ORP), DO and the like.
3. Electrochemical performance evaluation method
Voltage, current and cathode-anode potential: the voltage and the current are automatically collected and stored in a computer through a voltage and current data collection module. And connecting the saturated calomel electrode to a reference port of a universal meter to be used as a reference electrode, and measuring the potential of the cathode and the anode.
Polarization curve and power density curve: and respectively drawing a total polarization curve and a cathode and anode polarization curve by taking the current density as an abscissa and the electrode potential as an ordinate, and drawing a power density curve by taking the current density as an abscissa and the power density as an ordinate.
4. Stable operation of the plant
After the reactor is started, various operation parameters are ensured to be stable through stable maintenance operation.
The first embodiment is as follows: the microbial fuel cell type VSFW reactor is connected with a carbon source water inlet pump (1), and in an anaerobic section: a carbon source water inlet pump (1) pumps carbon source sewage into the VSFW-MFC reactor, an organic matter degradation reaction occurs at the graphite felt anode layer (3), and the sewage enters an aerobic section due to an up-flow running mode after the organic matter degradation reaction is completed; in the aerobic section: sewage enters the graphite plate cathode layer (4), and is contacted with air to form an air cathode, aerobic reaction occurs, and the sewage is discharged through the water discharge pipe (7) by the water discharge pump (9) after the aerobic reaction is completed. The device can fully separate a carbon source (an electron donor) from a nitrate (an electron acceptor) by utilizing an electrochemical principle, and can avoid competition between other floras for the electron donor and the electron acceptor, so that the denitrifying denitrifier and the electroactive bacteria obtain competitive advantages in an anaerobic stage, the denitrifying denitrifier and the electrochemically active floras are selectively proliferated in a system, in addition, the water inlet concentration can also be improved, and the proliferation rate of microorganisms is accelerated. The gas generated in the VSFW-MFC reactor was discharged from the top, 5 sampling tubes 6 were provided on the side wall of the reactor, and an evacuation tube 14 was provided at the bottom.
The second embodiment is as follows: the embodiment is described with reference to fig. 1, and a water bath insulating layer 10 and a temperature controller 11 are added as a heating device in the embodiment; the water bath heat preservation layer 10 is arranged on the outer surface of the reactor, and the VSFW-MFC reactor is heated through the water bath heat preservation layer 10, so that the biological treatment effect is better. The water bath device water inlet pipe 10-2 of the water bath heat insulation layer 10 is arranged at the lower part, the water bath device water outlet pipe 10-1 is arranged at the upper part, and the water inlet pipe and the water outlet pipe are arranged in an oblique diagonal line. The temperature controller 11 is connected with the water bath heat-insulating layer 10, the denitrifying denitrogenation bacteria and the electroactive bacteria have the best microbial activity under the condition of medium temperature, the temperature controller is used for controlling the temperature of the water bath heat-insulating layer 11 to enable the denitrifying denitrogenation bacteria and the electroactive bacteria to reach the best activity, and the temperature of the VSFW-MFC reactor is kept within the range of 30 +/-1 ℃.
The third concrete implementation mode: referring to fig. 1, the present embodiment is described, in which a graphite felt anode is disposed on an anode of a VSFW-MFC reactor, so as to significantly increase microorganism attachment sites on the anode of a reaction apparatus, thereby effectively increasing microorganism holding capacity.
Claims (4)
1. The VSFW reaction equipment is characterized in that the VSFW reaction equipment is connected with a carbon source water inlet pump (1) and mainly comprises an aerobic section and an anaerobic section;
an anaerobic section: a carbon source water inlet pump (1) is connected with a water inlet pipe (2) and is pumped into the VSFW reactor;
an aerobic section: the electric ball valve (8) is connected with a water outlet pump (9) through a water outlet pipe (7) to pump out water for drainage;
the aerobic section is provided with a graphite felt anode (3), the anaerobic section is provided with a graphite plate cathode (4), a resistor (5) is externally connected between the aerobic section and the anaerobic section, and electroactive microorganisms are rapidly enriched in the VSFW reactor;
the bottom is provided with a perforated supporting plate (13) and an emptying pipe (14).
2. The VSFW reactor of simultaneous denitrification and electrogenesis rapid enrichment microbial fuel cell type as claimed in claim 1, wherein 5 sampling tubes (6) are provided on the sidewall of the two-stage reactor (1).
3. The VSFW reactor of simultaneous denitrification and electrogenesis rapid enrichment microbial fuel cell type as claimed in claim 1, wherein the anode uses graphite felt electrode, the cathode uses graphite plate electrode, and both electrodes are horizontally disposed in the cylindrical reactor.
4. The VSFW reactor of simultaneous denitrification and electrogenesis rapid enrichment microbial fuel cell type as claimed in claim 1, wherein a water bath insulation layer (10) is added and connected to a heating device (12) on the outer surface of the reactor by a temperature controller (11).
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| CN202011102580.7A CN112573655A (en) | 2020-10-15 | 2020-10-15 | VSFW reaction equipment with synchronous denitrification, electrogenesis and rapid enrichment of microbial fuel cells |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735262A (en) * | 2021-08-16 | 2021-12-03 | 天津大学 | Synchronous denitrification electrogenesis microbial fuel cell type upflow vertical flow constructed wetland equipment |
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| WO2012012647A2 (en) * | 2010-07-21 | 2012-01-26 | Cambrian Innovation Llc | Denitrification and ph control using bio-electrochemical systems |
| CN104817175A (en) * | 2015-04-29 | 2015-08-05 | 深圳北航新兴产业技术研究院 | Method for reinforcing sewage denitrification and dephosphorization efficiency and simultaneously generating electricity |
| CN109678254A (en) * | 2018-12-27 | 2019-04-26 | 南昌航空大学 | A kind of microbiological fuel cell |
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- 2020-10-15 CN CN202011102580.7A patent/CN112573655A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012012647A2 (en) * | 2010-07-21 | 2012-01-26 | Cambrian Innovation Llc | Denitrification and ph control using bio-electrochemical systems |
| CN104817175A (en) * | 2015-04-29 | 2015-08-05 | 深圳北航新兴产业技术研究院 | Method for reinforcing sewage denitrification and dephosphorization efficiency and simultaneously generating electricity |
| CN109678254A (en) * | 2018-12-27 | 2019-04-26 | 南昌航空大学 | A kind of microbiological fuel cell |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735262A (en) * | 2021-08-16 | 2021-12-03 | 天津大学 | Synchronous denitrification electrogenesis microbial fuel cell type upflow vertical flow constructed wetland equipment |
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Application publication date: 20210330 |