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A combined method of biochemical and advanced oxidation for retaining ammonia nitrogen and removing antibiotics in the process of livestock and poultry breeding sewage treatment

An advanced oxidation and sewage treatment technology, applied in water/sewage treatment, animal husbandry wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problems of ammonia nitrogen nitrification, nitrogen loss, etc., to reduce COD, prevent ammonia nitrogen nitrification, The effect of low running cost

Active Publication Date: 2021-12-21
EAST CHINA UNIV OF SCI & TECH +1
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  • Claims
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AI Technical Summary

Problems solved by technology

The aerobic biological treatment system operates under long SRT, which is conducive to the growth and reproduction of nitrifying bacteria with long generations, so that the nitrification of ammonia nitrogen will inevitably occur, and even denitrification may occur inside the activated sludge flocs. Nitrogen, leading to loss of nitrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Anaerobic-aerobic biochemical treatment

[0025] First, a conventional batch anaerobic reactor is used for anaerobic biological treatment of sewage from a pig farm, and then a conventional batch aerobic reactor is used for aerobic biological treatment of the effluent from the anaerobic reactor. The sewage COD=6850mg / L, NH 3 -N=912 mg / L, TN=960 mg / L, TP=65 mg / L. However, the detected antibiotic content was very low, and 250 μg / L trimethoprim was artificially added to the sewage for the convenience of the experiment. HRT=5d, MLSS≈16.5g / L, pH≈7.5 of batch anaerobic reactor; HRT=2d, SRT=4d, MLSS≈1100mg / L, pH≈8.0, dissolved oxygen DO≈2.0mg of batch aerobic reactor / L.

[0026] After the intermittent anaerobic and intermittent aerobic reactors were running stably, the COD and NH in the effluent of the anaerobic reactor and the effluent of the aerobic reactor were measured respectively. 3 The concentration of conventional pollutants such as -N, the results show that: a...

Embodiment 2

[0032] (1) Anaerobic-aerobic biochemical treatment is the same as in Example 1.

[0033] (2) Advanced oxidation treatment

[0034] After the stable operation of the anaerobic-aerobic biochemical treatment system until the 28th day, the effluent of the aerobic reactor with COD=708mg / L was subjected to advanced oxidation treatment by the Fenton-like oxidation method. The Fenton-like oxidation test conditions are: COD:H 2 o 2 =1:1 (mass ratio), H 2 o 2 :Fe=5:1 (molar ratio), Fe:sodium citrate=1:1 (molar ratio), pH neutral. Repeat the Fenton-like oxidation test three times, and the average removal rate of trimethoprim is about 96.8%.

Embodiment 3

[0036] (1) Anaerobic-aerobic biochemical treatment is the same as in Example 1.

[0037] (2) Advanced oxidation treatment

[0038] When the anaerobic-aerobic biochemical treatment system runs stably until the 35th day, with O 3 Oxidation method Advanced oxidation treatment is carried out on the effluent of the aerobic reactor with COD=670mg / L. o 3 Oxidation reaction conditions are: O 3 The dosage is 10mg / (L·min), the reaction time is 30min, and the pH value is not adjusted. Repeat 3 times O 3 In the oxidation test, the average removal rate of trimethoprim is about 90.5%.

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Abstract

The invention provides a biochemical and advanced oxidation combined method for retaining ammonia nitrogen to remove antibiotics in the process of livestock and poultry sewage treatment. The biochemical and advanced oxidation combined method includes the following steps: (1) the biochemical treatment unit adopts an aerobic process, The sludge age of the sludge in the biochemical treatment system is controlled at ≤ 5 days, so that the nitrifying bacteria with a relatively slow growth and reproduction rate are "washed out" from the system; (2) The effluent of step (1) does not adjust the pH value, and directly uses ‑Fenton oxidation or O 3 Oxidation method carries out advanced oxidation treatment to remove the antibiotics in it. The method of the present invention not only retains the fertilizer effect of nitrogen in livestock and poultry breeding sewage, but also effectively removes COD and antibiotics, and the treated livestock and poultry sewage can be directly returned to the field without dilution, and at the same time greatly reduces the risk of antibiotic pollution .

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for treating livestock and poultry breeding sewage by a combined technology of biochemistry and advanced oxidation. Background technique [0002] According to reports, the total usage of antibiotics in my country in 2013 was as high as 162,000 tons, of which only about 78,000 tons were used for the treatment of human diseases, and the rest were basically used for livestock and poultry farming and aquaculture. In the livestock breeding industry, antibiotics are mostly used in livestock and poultry animals in the form of veterinary drugs and feed additives, but the utilization rate of antibiotics by organisms is low, and most of them are still excreted in the form of antibiotic parent compounds or their metabolites. In 2011, the amount of sewage generated by my country's pig breeding industry has exceeded 460×10 6 In addition to conventional pollutants such as hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/20C02F101/30
CPCC02F3/30C02F1/722C02F1/725C02F1/78C02F2101/30C02F2103/20C02F2305/026
Inventor 曹国民杨林燕孙贤波刘勇弟黎凯薛伟博李晔瑾沈根祥
Owner EAST CHINA UNIV OF SCI & TECH
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