Method for retaining ammonia nitrogen and removing antibiotics in biological treatment process of livestock and poultry breeding sewage

A sewage biological treatment, livestock and poultry breeding technology, applied in the field of sewage treatment, can solve the problems of ammonia nitrogen nitrification, nitrogen loss, etc., to achieve the effect of removing antibiotics, retaining ammonia nitrogen, and inhibiting ammonia nitrogen nitrification

Inactive Publication Date: 2019-09-17
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the aerobic biological treatment system operates at a long sludge age (≥30d), the nitrification of ammonia nitrogen will inevitably occur, and even denitrification and denitrification may occur inside the activated sludge flocs, resulting in the loss of nitrogen

Method used

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  • Method for retaining ammonia nitrogen and removing antibiotics in biological treatment process of livestock and poultry breeding sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1. Adopt figure 1 The process shown is anaerobic-aerobic biochemical treatment of sewage from a pig farm in Jinshan District, Shanghai

[0019] figure 1 HRT of medium UASB=3d, MLSS=15±1g / L, pH=7.5±0.5;

[0020] Aerobic pool A: HRT=3d, SRT=40d, MLSS=4500±500mg / L, pH=8.0±0.5, dissolved oxygen concentration DO=3.0±0.5mg / L;

[0021] Aerobic pool B: HRT=3d, SRT=40d, MLSS=4500±500mg / L, pH=8.0±0.5, dissolved oxygen concentration DO=3.0±0.5mg / L, TCMP dosage is 3.0mg / g VSS· d.

[0022] The average concentrations of COD and ammonia nitrogen in the influent are 5610mg / L and 835mg / L, respectively. After the anaerobic-aerobic biochemical treatment system runs stably, the average concentrations of COD and ammonia nitrogen in the secondary sedimentation tank A are 247mg / L and 7.3mg / L respectively. L. Therefore, when no TCMP is added to the aeration tank, the average removal rate of COD is about 95.6%, and the average removal (or nitrification) rate of ammonia nitrogen ...

Embodiment 2

[0026] The sewage treatment process, sewage source, operating conditions, etc. of Example 2 are the same as those of Example 1, the only difference is that the TCMP added to the aeration tank B in Example 1 is replaced by ATU, and the dosage is 15mg / g VSS·d.

[0027] The average concentrations of COD and ammonia nitrogen in the influent are 5382mg / L and 792mg / L respectively. After the anaerobic-aerobic biochemical treatment system runs stably, the average concentrations of COD and ammonia nitrogen in the secondary sedimentation tank A are 286mg / L and 10.3mg / L respectively. L. Therefore, when no ATU is added to the aeration tank, the average removal rate of COD is about 94.5%, and the average nitrification rate of ammonia nitrogen is 98.7%. The average concentrations of COD and ammonia nitrogen in the effluent of secondary sedimentation tank B are 430mg / L and 652mg / L respectively, so when ATU is added to the aeration tank, the average removal rate of COD is about 92.0%, and th...

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Abstract

The invention provides a method for retaining ammonia nitrogen and removing antibiotics in the biological treatment process of livestock and poultry breeding sewage. A nitrification inhibitor is added into an aerobic bioreactor with sludge age greater than or equal to 30 days to inhibit the activity of nitrifying bacteria. The nitrification inhibitor is preferably 2-chloro-6-trichloromethylpyridine (TCMP) or allyl thiourea (ATU). According to the invention, a chemical agent capable of inhibiting the activity of the nitrifying bacteria is added to an aerobic biological treatment unit of the livestock and poultry breeding sewage, so that the occurrence of ammonia nitrogen nitrification is inhibited, but the degradation of COD and the antibiotics by heterotrophic bacteria is not affected, and the aims of retaining ammonia the nitrogen and removing the antibiotics are realized.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for retaining ammonia nitrogen and removing antibiotics in the sewage biological treatment process. Background technique [0002] Benefiting from the role of veterinary antibiotics in effectively preventing and treating diseases and promoting animal growth, the scale of the global livestock and poultry breeding industry has continued to expand in recent years. In order to reduce costs and increase production, livestock and poultry breeding methods have gradually changed from semi-intensive to high-density, large-scale, and intensive, and the amount of veterinary antibiotics has also increased significantly. According to reports, the consumption of veterinary antibiotics in my country has exceeded 100,000 tons in 2015, accounting for more than half of the global consumption of veterinary antibiotics. The effective utilization rate of antibiotics in the livestock...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F3/34C02F101/30C02F101/34C02F101/38C02F103/20
CPCC02F3/006C02F3/12C02F3/34C02F2101/30C02F2101/34C02F2101/38C02F2101/40C02F2103/20C02F3/1231C02F3/2846C02F3/30C02F2209/06C02F2209/10C02F2303/26Y02W10/10C02F3/1205
Inventor 曹国民杨林燕刘勇弟孙贤波薛伟博黎凯李晔瑾沈根祥
Owner EAST CHINA UNIV OF SCI & TECH
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