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Method for realization of nitrite accumulation during nitrate reduction process

A nitrite and nitrate technology, applied in the field of water treatment, can solve problems such as difficulty in achieving deep denitrification, and achieve the effects of automatic program management, high denitrification rate, and simple maintenance.

Inactive Publication Date: 2014-02-26
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology

[0006] From this point of view, it is difficult to achieve deep denitrification with a single semi-short-cut nitrification-ANAMMOX system

Method used

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  • Method for realization of nitrite accumulation during nitrate reduction process
  • Method for realization of nitrite accumulation during nitrate reduction process
  • Method for realization of nitrite accumulation during nitrate reduction process

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Embodiment Construction

[0032] Attached below Figure 4 The actual operation effect describes the present invention in detail:

[0033] I. Selection of sludge type and concentration

[0034] The anoxic residual sludge in the anoxic / aerobic biofilm reactor with a sludge age of 40±2d was selected as the test sludge. Carry out 2.5 hours of aerobic aeration before the reaction starts, and place it for 2.5 hours, so that the microorganisms in the sludge are under the condition of non-nutritive substrate, then wash it with deionized water for 3 times, and place it in a sequencer with an effective volume of 3L. In the batch activated sludge reactor (SBR), the sludge concentration is set to 1200mg / L according to the volume of the reactor.

[0035] ii. Select carbon source and set carbon-nitrogen ratio

[0036] Sodium acetate was selected as the external carbon source. in NO 3 - During the -N reduction process, with the consumption of sodium acetate, a similar inflection point appeared on the pH curve, ...

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Abstract

A method for realization of nitrite accumulation during a nitrate reduction process, and belongs to the technical field of water treatment. The method is realized by the following steps: first, selecting a sludge type and concentration, setting the reactor sludge concentration to 1000 - 1500mg / L; selecting a carbon source and setting a carbon nitrogen ratio, when C / N reaches 2.5:1, instantly pouring raw water with the C / N being 2.5:1 into a reactor preloaded with sludge for sludge and water stirring and mixing, pouring water in again with helping of pH indication, after the last cycle is over and the water volume in the reactor reaches the upper limit of the reactor volume or an inflection point of a PH curve appears, when the PH value is greater than 9.5, stopping the reaction, precipitating for 10-15 min, separating the sludge and water, and draining away water after the precipitation is completed. The method is high in denitrification rate, simple to maintain, low in cost, and free of the need of professional operations.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a sewage treatment method. Background technique [0002] In China, especially in the northern regions, groundwater is an important source of drinking water. However, the substandard discharge of the effluent from the secondary treatment of urban sewage has resulted in a large amount of NO 3 - -N waste water enters surface or groundwater bodies, potentially threatening the safety of drinking water sources. Therefore, whether in urban or rural areas, the deep denitrification of sewage has become a major social problem. Due to the restriction of low carbon-to-nitrogen (C / N) ratio, for the deep denitrification of urban sewage, at present, the post-denitrification process by adding external carbon sources is widely used. However, this process often increases the operating cost and the difficulty of sludge disposal while achieving the ideal denitrification effect. In addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 霍明昕龚灵潇杨武朱遂一杨霞王艺刘剑聪方帅
Owner NORTHEAST NORMAL UNIVERSITY
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