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Method for improving heavy metal pollution impact load resistance of biological nitrogen removal system for sewage

A sewage biological, anti-heavy metal technology, applied in water pollutants, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of reduced total nitrogen removal efficiency, concentration and specific gravity, etc. Simple, Enhanced Ability Effects

Active Publication Date: 2019-02-19
SOUTHEAST UNIV
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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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  • Method for improving heavy metal pollution impact load resistance of biological nitrogen removal system for sewage
  • Method for improving heavy metal pollution impact load resistance of biological nitrogen removal system for sewage
  • Method for improving heavy metal pollution impact load resistance of biological nitrogen removal system for sewage

Examples

Experimental program
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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 biological sewage treatment, and particularly relates to a method for improving the heavy metal pollution impact load resistance ofa biological nitrogen removal system for sewage. The method comprises the step that in the biological nitrogen removal system for the sewage containing heavy metal pollutants, a N-acylated homoserinelactone compound which is composed of the lactonized homoserine part and acyl side chains with the carbon number of 6-14 is added into an exterior source. The method has the advantages that the operation is simple, the treatment efficiency is high, the heavy metal pollution impact load resisting capacity of microorganisms can be obviously improved by using a small amount of an agent, the outlet water quality of the biological nitrogen removal system for the sewage under heavy metal pollution stress can be effectively improved, and the method is economical, environmentally friendly and free ofsecondary pollution; when the biological sewage treatment system is impacted by toxicities of the heavy metal pollutants, the system stability and the system performance recovery capability can be effectively improved in time, and the method can be called as an emergent sewage treatment technology under a sudden heavy metal 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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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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