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Rapid starting method for biological nitration

A fast-start, biological technology, applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc., can solve the problems of long start-up time of biological nitrification process, etc. The effect of solving difficult sources

Inactive Publication Date: 2011-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a quick start-up method for biological nitrification in view of the long start-up time of biological nitrification process in high-nitrogen sewage treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The present invention is applied to treat comprehensive chemical wastewater produced by a chemical group. The water quality of the chemical wastewater is as follows: the COD value is 700±210mg / L, the ammonia nitrogen concentration is 47.1±8.1mg / L, and the Kjeldahl nitrogen concentration is 110.5±23.6mg / L. The treatment process adopts a typical A / O biological denitrification process, and the design nitrogen load is 0.18kgNH 3 -N / m 3 .d. The quick start of biological nitrification is divided into inoculation sludge adaptation stage and inoculation sludge nitrification cultivation stage.

[0017] In the sludge adaptation stage, firstly, filter press sludge from the brewery was inoculated into the nitrification tank, the inoculum amount was 30% of the total volume of the nitrification tank, and the moisture content of the inoculated sludge was 82%. Afterwards, lift the chemical wastewater into the nitrification tank with a lift pump to fill it up, and turn on the blower f...

Embodiment 2

[0021] The invention is applied to treat certain chemical washing wastewater. The designed water quality of the chemical washing wastewater is: the COD value is 1100 mg / L, and the ammonia nitrogen value is 310 mg / L. The treatment process adopts a typical A / O biological denitrification process, and the design nitrogen load is 0.24kgNH 3 -N / m 3 .d. The quick start of biological nitrification is divided into inoculation sludge adaptation stage and inoculation sludge nitrification cultivation stage.

[0022] In the adaption stage of the inoculation sludge, the filter press sludge from the brewery was first inoculated into the nitrification tank, the inoculum amount was 40% of the total volume of the nitrification tank, and the moisture content of the inoculation sludge was 85.2%. After that, lift the chemical washing wastewater into the nitrification tank with a lift pump, and turn on the blower for aerated culture. At this time, the sludge concentration MLSS in the reaction tan...

Embodiment 3

[0026] The present invention is applied to treat a certain domestic sewage. The designed water quality of the sewage is: the COD value is 450 mg / L, and the ammonia nitrogen value is 35 mg / L. The treatment process adopts a typical A / O biological denitrification process, and the design nitrogen load is 0.10kgNH 3 -N / m 3 .d. The quick start of biological nitrification is divided into inoculation sludge adaptation stage and inoculation sludge nitrification cultivation stage.

[0027] In the adaption stage of the inoculation sludge, the filter press sludge from the brewery was first inoculated into the nitrification tank, the inoculum amount was 30% of the total volume of the nitrification tank, and the moisture content of the inoculation sludge was 75.3%. Afterwards, the domestic sewage is pumped into the nitrification tank with a lift pump, and the blower is turned on for aeration cultivation. At this time, the sludge concentration MLSS in the reaction tank is 8014mg / L. Draina...

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Abstract

The present invention discloses a rapid starting method for biological nitration, which comprise an adaptation phase and a culturing phase. The operation in the adaptation phase comprises: using sludge from the beer factory press filtration for inoculation by amount of 30-40% of the nitration pool volume; culturing by continuous water-inlet and intermittent water-outlet mode, and draining water for 4-6 hours per 15-18 hours until the sludge concentration in the nitration pool no longer decreases; and the period of the adaptation phase is 6-8 days. And the operation of the culturing phase comprises: performing nitration culturing to the inoculated sludge by continuous water inlet-outlet mode; adding urea to increase the nitrogen load to 2-3 times of the designed nitrogen load, while complementing alkalinity by NaHCO3; controlling the dissolved oxygen DO in the reaction pool at 2.0-3.0 mg / L, pH value at 8.0-8.5, temperature at 20-25 degrees centigrade, waterpower dwell time for 15-20 hours and outlet water alkalinity at 30-40 mg / L; the period of the culturing phase is 10-12 days; and the ammonia nitrogen conversion rate in the nitration pool reaches 90-95%. The rapid starting method for biological nitration provided by the present invention solves the problems nitration inoculation sludge source in the industrial waste water nitrogen removal treatment, and solves the problem of starting difficulty and long starting time in biological nitration process.

Description

technical field [0001] The invention relates to industrial sewage treatment in the field of environmental protection, in particular to a quick start method for biological nitrification. Background technique [0002] At present, the effective denitrification method of high-nitrogen sewage generally adopts biological nitrification-denitrification, that is, using nitrifying bacteria to convert ammonia nitrogen into nitrite nitrogen and nitrate nitrogen, and then using denitrifying bacteria to convert nitrite nitrogen and nitrate nitrogen Nitrogen is converted into gaseous nitrogen, so as to achieve the purpose of finally removing nitrogen from water. Biological nitrification is the rate-limiting step in the nitrogen conversion process. Therefore, the rapid start of the biological nitrification process is very important for the biological nitrogen removal process. However, because nitrifying bacteria are very sensitive to environmental changes and have a long generation time, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 李文红靳杰陈英旭
Owner ZHEJIANG UNIV
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