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CN-121990692-A - Biological deamination treatment process based on iron-carbon coupling method

CN121990692ACN 121990692 ACN121990692 ACN 121990692ACN-121990692-A

Abstract

The application relates to the technical field of wastewater treatment, and particularly discloses a biological deamination treatment process based on an iron-carbon coupling method. A biological deamination treatment process based on an iron-carbon coupling method comprises the following steps of filling a sandwich structure iron-carbon composite filler into a reactor, then circularly contacting the surfaces of the filler by utilizing an iron reduction bacteria liquid and a sulfur autotrophic bacteria liquid to culture and form a composite membrane, wherein the sandwich structure iron-carbon composite filler comprises two conductive net layers and an iron powder layer arranged between the two net layers, treating wastewater, namely adjusting the pH value and the temperature of the wastewater, then introducing the wastewater into the reactor, utilizing hydrogen generated by an iron-carbon reaction as a signal source, automatically closing aeration to enter a denitrification mode when the concentration of the hydrogen is more than 0.5%, starting aeration to be converted into a nitrification mode when the concentration of the hydrogen is less than 0.2%, and continuously degrading ammonia nitrogen by the composite membrane formed in the reactor to finish deamination treatment.

Inventors

  • XIE BING
  • LI RUNHONG
  • LI YAN
  • FU YIBO

Assignees

  • 广东台泉科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260320

Claims (9)

  1. 1. A biological deamination treatment process based on an iron-carbon coupling method is characterized by comprising the following steps of: The preparation method comprises the steps of pretreating, namely filling a sandwich-structure iron-carbon composite filler into a reactor, and then circularly contacting the surfaces of the filler by utilizing an iron reduction bacteria liquid and a sulfur autotrophic bacteria liquid to culture and form a composite film, wherein the sandwich-structure iron-carbon composite filler comprises two conductive net layers and an iron powder layer arranged between the two net layers; The wastewater treatment comprises the steps of regulating the pH value and the temperature of the wastewater, then introducing the wastewater into a reactor, utilizing hydrogen generated by the iron-carbon reaction as a signal source, automatically closing aeration to enter a denitrification mode when the concentration of the hydrogen is more than 0.5 percent, starting aeration to be converted into a nitrification mode when the concentration of the hydrogen is less than 0.2 percent, and continuously degrading ammonia nitrogen by a composite membrane formed in the reactor to finish deamination treatment.
  2. 2. The biological deamination process based on the iron-carbon coupling method of claim 1, wherein the conductive mesh layer comprises a conductive activated carbon fiber mesh with a pore size of 5-10 microns.
  3. 3. The biological deamination treatment process based on the iron-carbon coupling method of claim 2, wherein the raw materials of the iron powder layer comprise, by weight, 75-80 parts of iron powder, 5-8 parts of micron-sized copper powder, 2-4 parts of micron-sized nickel powder and 3-5 parts of nano manganese dioxide.
  4. 4. The biological deamination treatment process based on the iron-carbon coupling method of claim 3, wherein the preparation method of the iron-carbon composite filler with the sandwich structure comprises the following steps: Uniformly stirring and mixing iron powder, micron-sized copper powder, micron-sized nickel powder and nano manganese dioxide to obtain mixed powder, then adding PVA aqueous solution, uniformly stirring and mixing, and drying to obtain particles; Adding the particles into a mould, and performing compression molding at room temperature to obtain a pressed material, degreasing at 300-500 ℃ under the protection of nitrogen, and sintering at 600-750 ℃ to obtain an iron powder layer; And compounding the iron powder layer with the conductive net layer, and performing hot press molding to obtain the iron-carbon composite filler with the sandwich structure.
  5. 5. The biological deamination treatment process based on the iron-carbon coupling method of claim 1, wherein the pretreatment step comprises the following steps: pumping the iron reducing bacteria into a reactor, closing aeration and stirring, and standing and adsorbing for 4-6h at 30 ℃; Mixing the iron reducing bacteria liquid and the sulfur autotrophic bacteria liquid, placing the mixture in a shaking table at 30 ℃, culturing the mixture for 3 to 5 days at a low speed of 80rpm to obtain a composite bacteria liquid, pumping the composite bacteria liquid into a reactor, starting a circulating pump, circulating the composite bacteria liquid for 12 to 24 hours at a flow rate of 0.2 to 0.5m/h, stopping the circulation, and sealing the reactor; Starting a circulating pump, controlling the temperature to be 30+/-2 ℃ in days 1-3, controlling the pH to be 7.0-7.5, DO to be 0.2mg/L, circulating the circulating flow at 0.5m/h, gradually increasing the ammonia nitrogen in the water to be 200mg/L from 50mg/L in days 4-10, and intermittently aerating for 20min every 4h to finish the culture of the film hanging.
  6. 6. The biological deamination treatment process based on the iron-carbon coupling method of claim 5, wherein the weight ratio of the iron-reducing bacteria liquid to the sulfur autotrophic bacteria liquid in the composite bacteria liquid is (30-40) (60-70).
  7. 7. The biological deamination treatment process based on the iron-carbon coupling method of claim 5, wherein the iron-reducing bacteria liquid is obtained by culturing iron-reducing bacteria in an iron-reducing bacteria culture medium, each liter of the iron-reducing bacteria culture medium contains ：NaHCO 3 ：2g,CH 3 COONa：0.8g,NH 4 Cl：0.3g,KH 2 PO 4 ：0.2g,MgCl 2 ：0.1g,Fe(OH) 3 colloids with the following components of 10g and 1mL of microelement solution, and the volume fraction of the iron-reducing bacteria in the iron-reducing bacteria culture medium is 5-10%.
  8. 8. The biological deamination treatment process based on the iron-carbon coupling method of claim 5, wherein the sulfur autotrophic bacteria liquid is obtained by culturing sulfur autotrophic bacteria in a sulfur autotrophic bacteria culture medium, each liter of the sulfur autotrophic bacteria liquid contains ：Na 2 S 2 O 3 ·5H 2 O：2.5g,NaHCO 3 ：1.5g,NH 4 Cl：0.5g,KH 2 PO 4 ：0.5g,MgSO 4 ·7H 2 O：0.2g,% of trace element solution by 1mL, and the volume fraction of the sulfur autotrophic bacteria in the sulfur autotrophic bacteria culture medium is 5-10%.
  9. 9. The biological deamination process based on the Fe-C coupling method of claim 8, wherein each liter of the trace element solution contains the following components ：FeCl 3 ·6H 2 O：0.25g,ZnSO 4 ·7H 2 O：0.22g,CoCl 2 ·6H 2 O：0.24g,MnSO 4 ·H 2 O：0.23g,Na 2 MoO 4 ·2H 2 O：0.22g,NiCl 2 ·6H 2 O：0.21g,CuSO 4 ·5H 2 O：0.08g.

Description

Biological deamination treatment process based on iron-carbon coupling method Technical Field The application relates to the technical field of wastewater treatment, in particular to a biological deamination treatment process based on an iron-carbon coupling method. Background At present, surface water eutrophication and groundwater pollution caused by a large amount of sewage with low carbon nitrogen ratio have seriously affected people's life, denitrification and denitrification of sewage by denitrifying bacteria are one of main ways of treating sewage, reduction by denitrifying bacteria requires the use of organic carbon sources in water as electron donors, but the content of organic carbon sources in sewage with low C/N ratio is low, and deep denitrification is difficult to realize by using a traditional biological method. In the prior art, the problem of insufficient carbon source in the sewage denitrification process is usually solved by using an external carbon source, and common carbon sources include sucrose, glucose, acetic acid, ethanol, methanol and the like, however, the external carbon source is easy to produce secondary pollution, the types of the carbon sources have great influence on the denitrification rate, the problems of nitrate nitrogen accumulation, high treatment cost and the like exist, meanwhile, the addition of the carbon source can increase the emission of CO 2, and the application of the external carbon source denitrification in the sewage deep denitrification with low C/N ratio is greatly limited, so that continuous and efficient ammonia nitrogen degradation cannot be realized. Disclosure of Invention In order to realize continuous and efficient ammonia nitrogen degradation on wastewater, the application provides a biological deamination treatment process based on an iron-carbon coupling method. The application provides a biological deamination treatment process based on an iron-carbon coupling method, which adopts the following technical scheme: a biological deamination treatment process based on an iron-carbon coupling method comprises the following steps: The preparation method comprises the steps of pretreating, namely filling a sandwich-structure iron-carbon composite filler into a reactor, and then circularly contacting the surfaces of the filler by utilizing an iron reduction bacteria liquid and a sulfur autotrophic bacteria liquid to culture and form a composite film, wherein the sandwich-structure iron-carbon composite filler comprises two conductive net layers and an iron powder layer arranged between the two net layers; The wastewater treatment comprises the steps of regulating the pH value and the temperature of the wastewater, then introducing the wastewater into a reactor, utilizing hydrogen generated by the iron-carbon reaction as a signal source, automatically closing aeration to enter a denitrification mode when the concentration of the hydrogen is more than 0.5 percent, starting aeration to be converted into a nitrification mode when the concentration of the hydrogen is less than 0.2 percent, and continuously degrading ammonia nitrogen by a composite membrane formed in the reactor to finish deamination treatment. According to the technical scheme, the sulfur autotrophic bacteria-iron reduction bacteria composite flora is implanted, a double-layer biological film is formed on the surface of the filler, the outer layer sulfur bacillus carries out autotrophic deamination by utilizing sulfate generated by iron-carbon reaction, the inner layer iron reduction bacteria regenerate ferrous ions to form a closed material circulation chain, the sludge yield is reduced, the sandwich structure iron-carbon composite filler forms a stable electron transmission network, electrons generated by iron corrosion directly act on the biological film, then hydrogen generated by iron-carbon reaction is used as a signal source, the switching of denitrification and nitrification is realized, the power consumption is reduced, ammonia nitrogen removal is realized through a self-powered electron transmission and flora symbiotic system, and meanwhile, an additional carbon source is not needed, so that continuous and efficient ammonia nitrogen degradation on wastewater is realized. In a specific embodiment, the conductive mesh layer comprises a conductive activated carbon fiber mesh having a pore size of 5 to 10 microns. In a specific implementation, the raw materials of the iron powder layer comprise, by weight, 75-80 parts of iron powder, 5-8 parts of micron-sized copper powder, 2-4 parts of micron-sized nickel powder and 3-5 parts of nano manganese dioxide. By adopting the technical scheme, the iron is used as a main anode to be corroded preferentially, generated electrons are quickly transferred to the conductive carbon net, metals with higher equipotential of copper and nickel are used as cathodes to be protected, the metals are gradually exposed in the later period, catalytic sites for