Method for obtaining stable nitrite accumulation by sewage denitrification

A nitrite and denitrification technology, applied in the field of sewage biological denitrification, to achieve the effect of easy control and stable nitrite accumulation

Inactive Publication Date: 2009-12-16
BEIJING UNIV OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing method of using biological nitrification to obtain nitrite accumulation in the field of sewage treatment, and propose to use the biological denitrification approach to obtain nitrite accumulation, so as to provide a stable source of nitrite for the anaerobic ammonium oxidation process

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  • Method for obtaining stable nitrite accumulation by sewage denitrification

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Embodiment Construction

[0021] The application of the present invention is illustrated below through a specific example.

[0022] A 20L SBR reactor was used to cultivate denitrified sludge. During the anoxic period, an electric stirrer was used for stirring, and for the aerobic period, microporous aerators were used for aeration. During the cultivation period, the temperature of the mixed solution in the reactor was controlled at 20-25°C by using a temperature-controlled heating rod.

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Abstract

The invention relates to a method for biological sewage treatment, in particular to a method for obtaining stable nitrite accumulation by sewage denitrification. By controlling the biological denitrification process of an activated sludge method, the method realizes the reduction of nitric acid salt and incomplete reduction of nitrite so as to obtain the stable nitrite accumulation. The method adjusts carbon nitrogen ratio of sewage and controls the carbon nitrogen ratio to be between 2.4 and 3.2 by using methanol or other external carbon sources, indicates the denitrification process of the activated sludge method by using the changing characteristics of the pH value, and finally realizes converting the nitric acid salt in the sewage into the nitrite to obtain the stable nitrite accumulation. The nitrite accumulation obtained by the method can reach around 25 percent of the amount of initial nitric acid salt of denitrification reaction. The nitrite can be taken as a nitrite source of anaerobic ammonium oxidation reaction.

Description

technical field [0001] The invention relates to the field of sewage treatment, and is a method for biological denitrification of sewage. Background technique [0002] At present, my country's water environment is not optimistic, and the eutrophication problem of algae growing wildly occurs continuously in water bodies such as Taihu Lake and Dianchi Lake. Eutrophication has become a common phenomenon in my country's water bodies and has a further development trend. The eutrophication of water not only seriously damages the water ecology, but also seriously affects the safety of drinking water. Nitrogen and phosphorus contained in a large amount of discharged sewage is the main cause of water eutrophication. Therefore, nitrogen and phosphorus in sewage have become the main removal objects of sewage treatment. [0003] The removal of nitrogen in sewage has long used the method of biological nitrification and denitrification, that is, the use of biological nitrification to con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 孟雪征付昆明曹相生钱栋
Owner BEIJING UNIV OF TECH
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