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Method for enriching anaerobic ammonium oxidation bacteria from common activated sludge

A technology of anammox bacteria and activated sludge, applied in the field of enrichment of anammox bacteria, can solve the problems that hinder the large-scale application of anammox process, less nitrification treatment of ordinary activated sludge, and long generation cycle , to achieve the effect of short time, less competition and high activity

Inactive Publication Date: 2013-06-19
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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Problems solved by technology

However, the generation cycle of anammox bacteria is relatively long, and its doubling time is about 11 days, so it takes a long time to enrich anammox bacteria from ordinary activated sludge, which seriously hinders the anammox process. large-scale application of
[0003] At present, denitrification treatment or no treatment is usually adopted for the enrichment of anammox bacteria in ordinary activated sludge at home and abroad, while the nitrification treatment of ordinary activated sludge is relatively seldom

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  • Method for enriching anaerobic ammonium oxidation bacteria from common activated sludge

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Embodiment 1

[0027] The reaction device is used to enrich the anammox bacteria. In the stage of ordinary activated sludge nitrification treatment, the temperature is controlled at 35±1°C, the pH is 7.5±0.5, and the concentration of ammonia nitrogen solution is gradually increased from 50mg / L to 100mg / L. After 2 weeks of cultivation, it enters Anammox enrichment stage. Control DO below 0.1mg / L, temperature at 35±1°C, pH at 7.5±0.5, avoid light, NO in water 2 - : NH 4 + The molar ratio between them is 1±0.2, and the concentration of the two gradually increases from 20mg / L to 100mg / L. Dosing activated carbon in the activity improvement stage, the dosage is 2g / L.

[0028] The results showed that it took 102 days for the nitrification treatment of common activated sludge to enrich Anammox bacteria. During the stable operation process (153-161d) after start-up, the average load of total nitrogen was 0.44gN·(gVSS·d) -1 , the average removal load of total nitrogen is 0.31gN·(gVSS·d) -1 , t...

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Abstract

The invention relates to the field of water treatment, and particularly relates to a method for enriching anaerobic ammonium oxidation bacteria by performing nitration treatment on common activated sludge. The method is characterized in that nitration treatment is performed on the common activated sludge, thus increasing the quantity of aerobiotic ammonium oxidation bacteria (AOB) in the sludge; some AOB are facultative anaerobes and capable of performing similar anaerobic ammonium oxidation in an oxygen-free condition; additionally, AOB generate hydroxylamine oxidoreductase which is beneficial to enrichment for the anaerobic ammonium oxidation bacteria; and activated carbon is poured in an activity enhancement phase to improve the attachment environment for the anaerobic ammonium oxidation bacteria, and the competitions of other bacteria and Anammox bacteria for the attachment environment of activated carbon can also be reduced. The invention provides a time-saving and efficient method for enriching anaerobic ammonium oxidation bacteria.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for enriching anammox bacteria from ordinary activated sludge. Background technique [0002] The denitrification process has become an important research topic for controlling water pollution and protecting the water environment, and it is also one of the core issues in the research of advanced sewage treatment. Anaerobic ammonia oxidation (Anammox) refers to that under anaerobic conditions, anaerobic ammonia oxidation bacteria use nitrite as the electron acceptor to directly convert NH 4 + -N converts to N 2 . Compared with the traditional nitrification and denitrification process, it does not need an external organic carbon source for denitrification, and the sludge output is less, which can save operating costs. However, the generation cycle of anammox bacteria is relatively long, and its doubling time is about 11 days, so it takes a long time to enrich anammox bact...

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Application Information

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IPC IPC(8): C02F3/34C02F3/30C02F101/16
Inventor 王淑梅周英杰张兆基陈少华
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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