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A method for improving the impact load resistance of heavy metal pollution in sewage biological denitrification system

A sewage biological and anti-heavy metal technology, applied in water pollutants, chemical instruments and methods, biological water/sewage treatment, etc. Simple, improve system stability and the effect of system performance recovery

Active Publication Date: 2021-06-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitrosifying bacteria and nitrifying bacteria, as typical and widespread chemoautotrophic bacteria in sewage denitrification process, are very sensitive to environmental changes and pollutant toxicity stress. It is known that heavy metals entering the sewage treatment system will cause The concentration and specific gravity of nitrifying bacteria, especially nitrosifying bacteria, will decrease, and the total nitrogen removal efficiency of the system will decrease
Studies have found that AHLs signaling molecules are of great significance in biological wastewater treatment, such as promoting the aggregation and stabilization of microorganisms, accelerating the formation and maturation of biofilms, increasing the enzyme activity of microbial biochemical reactions, and promoting aerobic sludge granulation, etc. There are few reports on the use of bacterial quorum sensing to improve their ability to resist the toxicity of heavy metal pollutants and alleviate the impact of heavy metal shock loads on sewage biological systems, especially the performance of biological nitrogen removal.

Method used

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  • A method for improving the impact load resistance of heavy metal pollution in sewage biological denitrification system
  • A method for improving the impact load resistance of heavy metal pollution in sewage biological denitrification system
  • A method for improving the impact load resistance of heavy metal pollution in sewage biological denitrification system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take activated sludge from the aeration tank of a municipal sewage treatment plant, and configure artificial simulated wastewater: take 6.5gCH 3 COONa, 1.2 g NaHCO 3 , 2.3g NH 4 Cl, 0.11g KH 2 PO 4 , 0.14g K 2 HPO 4 , 2mL trace element solution (ZnSO 4 ·7H 2 O 0.6g, MnCl 2 · 4 h 2 O 0.6g, NaMoO 4 · 2 h 2 O 0.3g, CuSO 4 · 5 h 2 O 0.15g, KI 0.15g, H 3 BO 3 0.75g, CoCl 2 · 6 h 2 O 0.75g, FeCl 3 · 6 h 2 O 7.5g dissolved in 1L ultrapure water), 2mL CaCl 2 ·H 2 O solution, 2mL MgSO 4 ·7H 2 O solution is placed in a culture tank with an effective volume of 10L, and the artificially simulated wastewater quality conditions are: COD=500±3mg / L, SOP=5.0±0.3mg / L, NH 4 + -N=60±2mg / L, NO 2 - -N=1.5±0.2mg / L, NO 3 - -N=4.2±0.6 mg / L, pH=7.0±0.5. The activated sludge was inoculated into the artificial simulated wastewater, and after 5 months of domestication in the laboratory until the effluent index was stable, it was injected into the SBR reactor with an...

Embodiment 2

[0030] Take activated sludge from the aeration tank of a municipal sewage treatment plant, and configure artificial simulated wastewater: take 6.5gCH 3 COONa, 1.2 g NaHCO 3 , 2.3g NH 4 Cl, 0.11g KH 2 PO 4 , 0.14g K 2 HPO 4 , 2mL trace element solution (ZnSO 4 · 7 h 2 O 0.6g, MnCl 2 · 4 h 2 O 0.6g, NaMoO 4 · 2 h 2 O 0.3g, CuSO 4 · 5 h 2 O 0.15g, KI 0.15g, H 3 BO 3 0.75g, CoCl 2 · 6 h 2 O0.75g, FeCl 3 · 6 h 2 O 7.5g dissolved in 1L ultrapure water), 2mL CaCl 2 ·H 2 O solution, 2mL MgSO 4 ·7H 2 O solution is placed in a culture tank with an effective volume of 10L, and the artificially simulated wastewater quality conditions are: COD=500±3mg / L, SOP=5.0±0.3mg / L, NH 4 + -N=60±2mg / L, NO 2 - -N=1.5±0.2mg / L, NO 3 - -N=4.2±0.6 mg / L, pH=7.0±0.5. The activated sludge was inoculated into the artificial simulated wastewater, and after 5 months of domestication in the laboratory until the effluent index was stable, it was injected into the SBR reactor with ...

Embodiment 3

[0035] Take activated sludge from the aeration tank of a municipal sewage treatment plant, and configure artificial simulated wastewater: take 6.5gCH 3 COONa, 1.2 g NaHCO 3 , 2.3g NH 4 Cl, 0.11g KH 2 PO 4 , 0.14g K 2 HPO 4 , 2mL trace element solution, 2mL CaCl 2 ·H 2 O solution, 2 mL MgSO 4 ·7H 2 O solution is placed in a culture tank with an effective volume of 10L, and the artificially simulated wastewater quality conditions are: COD=500±3mg / L, SOP=5.0±0.3mg / L, NH 4 + -N=60±2mg / L, NO 2 - -N=1.5±0.2mg / L, NO 3 - -N=4.2±0.6 mg / L, pH=7.0±0.5. The activated sludge was inoculated into the artificial simulated wastewater, and after 5 months of domestication in the laboratory until the effluent index was stable, it was injected into the SBR reactor with an effective volume of 1.5L (reaction cycle total 8h: water inflow 10min; anoxic 120min; aerobic 240min) ; Precipitation 40min; Outflow 10min; Idle 60min) adding final concentration of 25mg / L ZnSO 4 and 1mg / L CuSO 4...

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Abstract

The invention belongs to the fields of environmental toxicology and sewage biological treatment, and specifically relates to a method for improving the impact load of microorganisms in a sewage biological denitrification system against heavy metal pollution. In the sewage biological denitrification system containing heavy metal pollutants, external sources are added by An N-acyl homoserine lactone compound composed of a lactonized homoserine part and an acyl side chain with a carbon number of 6 to 14; the method of the invention has the advantages of simple operation, high processing efficiency, and a small amount of medicament can significantly improve microbial The ability to resist the impact load of heavy metals can effectively improve the effluent quality of the sewage biological treatment system under the stress of heavy metal pollution. It is economical and environmentally friendly without secondary pollution. When the sewage biological treatment system is subjected to the toxic impact of heavy metal pollutants, it can timely and effectively improve system stability and The recovery ability of the system performance can be called the sewage emergency treatment technology under the heavy metal sudden pollution accident.

Description

technical field [0001] The invention belongs to the fields of environmental toxicology and sewage biological treatment, and relates to a method for improving the impact load resistance of a sewage biological denitrification system, in particular to a method for improving the microbial resistance to heavy metal pollution impact load in the sewage biological denitrification system. Background technique [0002] With the development of industries such as mining, chemical industry, electroplating, smelting, and electronics, and improper landfilling and stacking of civil solid waste, water pollution by heavy metals has become increasingly serious. During the production, use and treatment of heavy metals, industrial wastewater containing high concentrations of heavy metals is illegally discharged and sudden heavy metal pollution accidents can lead to heavy metal content in wastewater exceeding the standard, and finally enter the municipal sewage treatment system through the sewage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/301C02F2101/16C02F2101/163C02F2101/166
Inventor 余冉高欢常岩吴俊康叶金宇
Owner SOUTHEAST UNIV
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