Largest nitrite accumulation method in denitrification process

A nitrite and denitrification technology, applied in anaerobic digestion treatment and other directions, can solve the problems of long start-up time, easy to be destroyed, complicated control process, etc., to achieve short start-up time, high nitrite accumulation, nitrite The effect of high accumulation rate

Active Publication Date: 2016-02-17
BEIJING UNIV OF TECH
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Problems solved by technology

However, this method has shortcomings such as long start-up time, easy to be destroyed, and complicated control process, which are the main factors that limit its large-scale application.

Method used

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  • Largest nitrite accumulation method in denitrification process
  • Largest nitrite accumulation method in denitrification process

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Embodiment Construction

[0025] Combined with specific experimental examples, this method is further explained:

[0026] The SBR reactor was used to carry out the experiment of nitrite accumulation in the process of denitrification. The effective volume of the reactor was 10L; each cycle of the SBR reactor included water intake for 6 minutes, anoxic stirring for 35 minutes, precipitation for 20 minutes, and then the supernatant was discharged. 50%.

[0027] Specifically include the following steps:

[0028] (1) Inoculate the sludge in the primary sedimentation tank, and control the concentration of the influent sludge at 2000-4000mg / L.

[0029] (2) After the nitrate wastewater enters the denitrification reactor, adjust the pH value in the reactor to 9-9.5, and then add sodium acetate to make the system's initial COD / NO 3 - -N is between 2.5 and 3.5;

[0030] (3) Anoxic stirring, the specific time is set as follows: in the first cycle, measure the NO in the reactor every hour after the stirring sta...

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Abstract

A quick largest nitrite accumulation method in denitrification process belongs to the technical field of biological treatment of sewage. According to the method, the largest nitrite accumulation method in denitrification process can be realized by inoculation of primary sludge, and the method includes the following steps: the primary sludge is used as inoculation sludge, mixed liquid sludge concentration MLSS after inflow is maintained in 2000-4000mg / L; sodium acetate is added to be used as a denitrification carbon source, COD / NO<->-N after addition is controlled between 2.5 and 3.5; the reactor pH value is controlled between 9 and 9.5, and ultimately the conversion from nitrate to nitrite can be realized. The method is easy to control and simple in operation, the inoculation sludge is rich in source, effluent nitrite accumulation rate reaches 85% to 95%, and the inoculation sludge can be used as an anaerobic ammonia oxidation reaction electron acceptor source.

Description

technical field [0001] The invention relates to a method for realizing maximum accumulation of nitrite in a denitrification process, and belongs to the technical field of sewage biological treatment. Specifically, the bottom sludge of the primary sedimentation tank of the sewage plant is inoculated, and sodium acetate is used as the carbon source. The maximum accumulation of nitrite is achieved by controlling the dosage of sodium acetate in the denitrification process and maintaining the pH value of 9 to 9.5 during the reaction process. The method is suitable for the deep denitrification of wastewater containing a large amount of nitrate nitrogen through anaerobic ammonium oxidation technology. Background technique [0002] The eutrophication problem caused by excessive nitrogen and phosphorus content in the water body is very serious, and the sewage discharge standard is becoming increasingly strict. In order to meet the discharge standard, the development and application o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 王淑莹鲍方博王慰杜睿邢立群彭永臻
Owner BEIJING UNIV OF TECH
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