CN110921812A - Photoelectrocatalysis coupling autotrophic denitrification microorganism nitrogen and phosphorus removal process method - Google Patents
Photoelectrocatalysis coupling autotrophic denitrification microorganism nitrogen and phosphorus removal process method Download PDFInfo
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- CN110921812A CN110921812A CN201911319755.7A CN201911319755A CN110921812A CN 110921812 A CN110921812 A CN 110921812A CN 201911319755 A CN201911319755 A CN 201911319755A CN 110921812 A CN110921812 A CN 110921812A
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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
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- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/345—Biological treatment of water, waste water, or sewage characterised by the microorganisms used for biological oxidation or reduction of sulfur compounds
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- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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Abstract
The invention discloses a process method for removing nitrogen and phosphorus by coupling photoelectrocatalysis with autotrophic denitrification microorganisms, belonging to the technical field of sewage treatment. It comprises the following steps: (1) adding a photocatalyst on a cathode-anode reaction column of a microbial electrochemical reactor, wherein the photocatalyst can degrade organic matters in the domestic sewage into CO under natural light2And H2O; (2) autotrophic denitrifying bacteria are placed at the anode of the microbial electrochemical reactor, and algae are placed at the cathode of the microbial electrochemical reactor; (3) Domestic sewage is injected into the microbial electrochemical reactor, and the domestic sewage is purified. The photocatalytic oxidation technology is combined with synchronous nitrogen and phosphorus removal of algae, and the light source is used for photosynthesis of the algae while the photocatalytic reaction is realized, so that organic conversion of nitrogen and phosphorus is realized, and the aim of removing nitrogen and phosphorus from sewage is fulfilled.
Description
Technical Field
The invention relates to a process method for removing nitrogen and phosphorus by coupling photoelectrocatalysis with autotrophic denitrification microorganisms, belonging to the technical field of sewage treatment.
Background
Although the domestic sewage treatment industry of villages and towns develops rapidly in recent years, the method still faces many problems, and the following 4 points are mainly included:
(1) the number of plants is large, the dispersity is strong, and the site selection is difficult;
(2) the difference between water quality and water quantity is large;
(3) the standard is ambiguous and imperfect;
(4) the operation effect of part of treatment facilities is poor, and the water quality is difficult to reach the standard.
For distributed domestic sewage treatment equipment, COD and ammonia nitrogen treatment can reach the standard and can be removed by enhanced aeration, however, too high dissolved oxygen can cause that the content of nitrate nitrogen in effluent is too high, and further brings risks to human health and environment. Excessive nitrate can induce eutrophication of adjacent surface waters, and algae can produce toxins and reduce the dissolved oxygen content of the water during activity, thereby affecting the biodiversity of the area.
As the quality of the connecting pipe of the domestic sewage in the villages and the towns is mostly the water for the toilets of the residents, the C/N ratio is low, which brings great influence on the removal of the total nitrogen. The traditional nitrogen removal method is to carry out biological nitrification treatment and then carry out heterotrophic denitrification, and organic matters such as methanol, ethanol, sodium acetate and the like need to be added, so that the investment of the organic matters is increased, more sludge is generated in a system, the operation and treatment cost is increased, and new pollution is possibly introduced.
Therefore, the photoelectrocatalysis oxidation technology is adopted, and the coupled autotrophic denitrification microbial electrochemical reactor is used for deeply and effectively removing TN in the integrated sewage treatment equipment.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical method solves the problems that the prior denitrification method firstly carries out biological nitrification treatment and then carries out heterotrophic denitrification, and organic matters such as methanol, ethanol, sodium acetate and the like need to be added, so that the investment of the organic matters is increased, more sludge is generated in a system, the operation and treatment costs are increased, and new pollution can be introduced.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a photoelectrocatalysis coupling autotrophic denitrification microorganism nitrogen and phosphorus removal process method comprises the following steps:
(1) adding a photocatalyst on a cathode-anode reaction column of a microbial electrochemical reactor, wherein the photocatalyst can degrade organic matters in the domestic sewage into CO under natural light2And H2O；
(2) Autotrophic denitrifying bacteria are placed at the anode of the microbial electrochemical reactor, the conversion rate of the autotrophic denitrifying bacteria is improved by means of photocatalytic reaction, hydrogen ions are provided for the cathode of the microbial electrochemical reactor, algae are placed at the cathode, on one hand, the hydrogen ions provided by the anode are utilized, on the other hand, photosynthesis is carried out by means of illumination, and nutrient substances such as N, P in domestic sewage are synthesized into complex organic matters, so that the content of nitrogen and phosphorus in a water body is reduced;
(3) domestic sewage is injected into the microbial electrochemical reactor, and the domestic sewage is purified.
As a preferred example, the photocatalyst employs TiO2、ZnO、Fe2O3、SnO2、WO3Any one of them.
As a preferred example, the autotrophic denitrifying bacteria employ Thiobacillus denitrificans.
As a preferred example, the algae is Chlorella.
a. Photocatalytic technology
Photochemical and photocatalytic oxidation methods are currently a more studied advanced oxidation technology. The photocatalytic reaction is a chemical reaction that proceeds by the action of light. Photochemical reactions require molecules to absorb electromagnetic radiation of a particular wavelength, be excited to produce a molecular excited state, and then undergo a chemical reaction to produce a new species, or become an intermediate chemical product that initiates a thermal reaction. The photocatalytic oxidation reaction uses semiconductor and air as catalyst (such as TiO)2、ZnO、Fe2O3、SnO2、WO3Etc.) to degrade organic matter into CO using light as energy2And H2And O. Phenol-containing wastewater, pesticide wastewater, surfactant, chloride, high polymer, oil-containing wastewater and the like can be degraded by photocatalytic oxidation.
b. Autotrophic denitrifying bacteria
Thiobacillus denitrificans is an obligate autotrophic and facultative anaerobic type bacterium. Can oxidize the elemental sulfur and the sulfide into the sulfate under aerobic conditions. Under anaerobic conditions, autotrophic denitrification is performed by using nitrate as an electron acceptor. In the sulfur autotrophic denitrification process, the thiobacillus denitrificans can utilize reduced substances, such as sulfide, thiosulfate or elemental sulfur, as an electron donor to reduce nitrate into nitrogen, so that the denitrification process is realized.
The sulfur autotrophic denitrification process was previously used for biological denitrification of nitrate-contaminated groundwater. In recent years, the application range of the method is continuously expanded, and the method is gradually used for special polluted water bodies with low C/N ratio, such as landfill leachate, river bank leachate, closed cycle culture system wastewater and the like.
Although the sulfur autotrophic denitrification process using the thiobacillus denitrificans has some defects in the aspect of large-scale application at present and is still to be solved, the technology has the advantages of easy operation, maintenance-free property, no secondary pollution, high efficiency, low energy consumption and the like, and obtains more and more attention of researchers at home and abroad.
c. Synchronous denitrification and dephosphorization of algae
In recent years, aquaculture scale is continuously enlarged, and the discharge of N, P-rich aquaculture sewage causes serious environmental pollution. Therefore, how to realize the effective purification of aquaculture sewage and the resource utilization of waste N, P is an important issue for the further development of aquaculture industry. Research shows that the algae can effectively remove nitrogen and phosphorus in the culture sewage, and meanwhile, the harvested algae can be used as fish bait, food raw materials or biomass raw materials to prepare biological energy.
The chlorella is wide in range, easy to culture and obvious in purification effect on sewage rich in nitrogen and phosphorus. Researchers have compared the water purification effects of various algae, and chlorella is considered to be one of the dominant algae species for removing N, P. The chlorella harvested after water purification is not only a high-quality bait for larvae of fish, shrimps, shellfish and the like, but also an important substance for extracting substances such as protein, polysaccharide, unsaturated fatty acid and the like and preparing biological energy.
d. Microbial electrochemical reactor
The microbial electrochemical reactor is an integrated sewage treatment device with cathode and anode reaction columns, namely, the cathode and anode reaction columns are added in the existing integrated sewage treatment reactor. In a Microbial Electrochemical System (MES), an electrode flora can lead out electrons to form current while degrading environmental pollutants, so that the chemical energy of the pollutants is directly converted into electric energy. Or the bioelectronic is further stored in acceptor substances such as protons, carbon dioxide and the like with the assistance of an external power supply, and hydrogen and chemical products with higher added values are produced.
The biological cathode MES technology refers to a process that cathode microorganisms combine with a final electron acceptor by utilizing electrons and protons transferred from an anode through the metabolism of the cathode microorganisms to complete a final reaction and obtain energy so as to realize the growth and the propagation of the cathode microorganisms. Denitrification is one of the important functions of the biocathode group. The existing 50L biological cathode MES reactor realizes synchronous denitrification and electric energy recovery, and the total nitrogen removal efficiency can reach 84% through the regulation and control of an external circuit. In addition, the biological cathode MES reactor can realize the high-efficiency degradation of nitrobenzene and p-nitrophenol and the high-efficiency recovery of heavy metals such as vanadium, mercury, copper, chromium and the like.
The invention has the beneficial effects that:
(1) the photocatalytic oxidation technology is combined with synchronous nitrogen and phosphorus removal of algae, and a light source is used for photosynthesis of the algae while the photocatalytic reaction is realized, so that organic conversion of nitrogen and phosphorus is realized, and the aim of removing nitrogen and phosphorus from sewage is fulfilled;
(2) the photocatalytic oxidation technology improves the catalytic efficiency of the catalyst, and the photocatalytic-local surface plasmon resonance technology is adopted to effectively accelerate the conversion rate of nitrogen and phosphorus in the sewage;
(3) the photoelectrocatalysis-microbial fuel cell technology is applied to advanced treatment of domestic sewage for the first time, a microbial electrochemical reactor for the intergrowth of thiobacillus denitrificans and chlorella is constructed, the defect of low COD (chemical oxygen demand) of the domestic sewage of villages and small towns is made up, and the removal of total nitrogen is enhanced.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easily understood, the invention is further described with reference to the following embodiments.
A photoelectrocatalysis coupling autotrophic denitrification microorganism nitrogen and phosphorus removal process method comprises the following steps:
(1) adding a photocatalyst on a cathode-anode reaction column of a microbial electrochemical reactor, wherein the photocatalyst can degrade organic matters in the domestic sewage into CO under natural light2And H2O；
(2) Autotrophic denitrifying bacteria are placed at the anode of the microbial electrochemical reactor, the conversion rate of the autotrophic denitrifying bacteria is improved by means of photocatalytic reaction, hydrogen ions are provided for the cathode of the microbial electrochemical reactor, algae are placed at the cathode, on one hand, the hydrogen ions provided by the anode are utilized, on the other hand, photosynthesis is carried out by means of illumination, and nutrient substances such as N, P in domestic sewage are synthesized into complex organic matters, so that the content of nitrogen and phosphorus in a water body is reduced;
(3) domestic sewage is injected into the microbial electrochemical reactor, and the domestic sewage is purified.
Examples
The photocatalyst adopts TiO2Autotrophic denitrifying bacteria adopt thiobacillus denitrificans; the algae is Chlorella.
Photosynthesis, catalytic reaction and microbial electrochemical technology are coupled, autotrophic nitrifying bacteria (thiobacillus denitrificans) are adopted at the anode to realize denitrification and provide hydrogen ions, algae (chlorella) are adopted at the cathode, and photosynthesis is utilized to realize synchronous nitrogen and phosphorus removal.
The photocatalytic oxidation technology is combined with synchronous nitrogen and phosphorus removal of algae, and a light source is used for photosynthesis of the algae while the photocatalytic reaction is realized, so that organic conversion of nitrogen and phosphorus is realized, and the aim of removing nitrogen and phosphorus from sewage is fulfilled; the photocatalytic oxidation technology improves the catalytic efficiency of the catalyst, and the photocatalytic-local surface plasmon resonance technology is adopted to effectively accelerate the conversion rate of nitrogen and phosphorus in the sewage; the photoelectrocatalysis-microbial fuel cell technology is applied to advanced treatment of domestic sewage for the first time, a microbial electrochemical reactor for the intergrowth of thiobacillus denitrificans and chlorella is constructed, the defect of low COD (chemical oxygen demand) of the domestic sewage of villages and small towns is made up, and the removal of total nitrogen is enhanced
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A photoelectrocatalysis coupling autotrophic denitrification microorganism nitrogen and phosphorus removal process method is characterized by comprising the following steps:
(1) adding a photocatalyst on a cathode-anode reaction column of a microbial electrochemical reactor, wherein the photocatalyst can degrade organic matters in the domestic sewage into CO under natural light2And H2O；
(2) Autotrophic denitrifying bacteria are placed at the anode of the microbial electrochemical reactor, the conversion rate of the autotrophic denitrifying bacteria is improved by means of photocatalytic reaction, hydrogen ions are provided for the cathode of the microbial electrochemical reactor, algae are placed at the cathode, on one hand, the hydrogen ions provided by the anode are utilized, on the other hand, photosynthesis is carried out by means of illumination, and nutrient substances such as N, P in domestic sewage are synthesized into complex organic matters, so that the content of nitrogen and phosphorus in a water body is reduced;
(3) domestic sewage is injected into the microbial electrochemical reactor, and the domestic sewage is purified.
2. The process of claim 1, wherein the photocatalyst is TiO, and the process is characterized in that2、ZnO、Fe2O3、SnO2、WO3Any one of them.
3. The process of claim 1, wherein the autotrophic denitrifying bacteria are Acidithiobacillus denitrificans.
4. The process of claim 1, wherein the algae is Chlorella vulgaris.
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| CN113387430A (en) * | 2021-07-12 | 2021-09-14 | 国润(广东)生物科技有限公司 | Device and method for treating organic wastewater by using continuous energy supply of microbial fuel cell |
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Application publication date: 20200327 |