Method for realizing maximal accumulation of nitrite in sludge fermentation coupling denitrification process

A nitrite and denitrification technology, applied in chemical instruments and methods, biological sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as long start-up time, unstable accumulation of nitrite, complicated control process, etc. , to achieve the effects of short start-up time, stable nitrite accumulation, and simple control methods

Active Publication Date: 2014-07-02
TIANJIN HUANCHUANG TECH DEV CO LTD
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Problems solved by technology

However, this method has disadvantages such as long start-up time, complex control process, and unstable accumulation of nitrous oxide, which are also the main factors that limit its large-scale application.

Method used

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  • Method for realizing maximal accumulation of nitrite in sludge fermentation coupling denitrification process

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Embodiment Construction

[0026] This method is further described in conjunction with specific experimental examples and accompanying drawings:

[0027] The SBR reactor was used for the nitrite accumulation test in the denitrification process, and the effective capacity of the reactor was 5L; each cycle of the SBR reactor included water inflow for 10 minutes, anoxic stirring for 240-400 minutes, precipitation for 60 minutes, and then the supernatant was discharged. 50%.

[0028] The specific test includes the following steps:

[0029] (1) Inoculate the sludge of the sludge fermentation coupling denitrification system, and control the sludge concentration MLSS after influent to 2000-2500mg / L; Activated sludge in the nitrification reactor, the sludge fermentation coupling denitrification reactor adopts alternate anaerobic / anoxic operation mode, the sludge age SRT is 20-28 days; each cycle of anaerobic stirring fermentation is 6-8h, and then the pump NO 3 - -N wastewater, where NO 3 - -N=35~55mg / L, ...

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Abstract

The invention discloses a method for realizing maximal accumulation of nitrite in a sludge fermentation coupling denitrification process. According to the method, the maximal accumulation of nitrite in a denitrification process can be realized by inoculating sludge of a sludge fermentation coupling denitrification system, and particularly comprises the following steps of: after water is input, maintaining the sludge concentration MLSS of mixed liquid to be 1,500 to 3,000 mg / L by taking active sludge of a sludge fermentation coupling denitrification reactor as inoculated sludge; and adding sludge fermentation supernatant as a denitrification carbon source, controlling the SCOD / NO3--N after the sludge fermentation supernate is added to be between 2.8 and 4.5, and stopping anoxic stirring by monitoring the pH value changing curve in the denitrification process so as to stop denitrification reaction and finally transform nitrate into nitrite. The method is easy to control and simple to operate; the nitrite accumulation rate of the output water reaches 80 to 95 percent and the nitrite can serve as a source of electron acceptors of anaerobic ammonia oxidation reaction; and the adding cost of external carbon sources is reduced and sludge reduction is realized.

Description

technical field [0001] The invention relates to a method for realizing the maximum accumulation of nitrite in a sludge fermentation coupling denitrification process, and belongs to the technical field of sewage biological treatment. Specifically, inoculate a sludge fermentation coupling denitrification system sludge that has been in an alternating anaerobic / anoxic environment for a long time, use the short-chain fatty acids in the sludge fermentation liquid as carbon sources, and control the input of the fermentation liquid during the denitrification process. Dosage and monitoring of pH changes during the reaction to achieve maximum nitrite accumulation. 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] Due to the severe water eutrophication caused by nitrogen and phosphorus pollution in water bodies, in order to meet the increasingly ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F3/28C02F101/16
Inventor 彭永臻杜睿操沈彬吴程程王淑莹
Owner TIANJIN HUANCHUANG TECH DEV CO LTD
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