Domestication screening method of aerobic denitrifying phosphorus accumulating bacteria for processing sewage with low C/N ratio

Abstract

The invention belongs to the field of sewage treatment and environmental protection, and more particularly relates to a domestication screening method of aerobic denitrifying phosphorus accumulating bacteria for processing sewage with low C/N ratio. In the invention, black odorous water sediments with a certain nitrogen and phosphorus contents are selected as a source of bacteria, and combined with a suitable culture medium to obtain the aerobic denitrifying phosphorus accumulating bacteria having good nitrogen and phosphorus removal effect on sewage with low C/N ratio through aerobic bacteriaenrichment, aerobic pre-screening and aerobic domestication culture successively. Since the same bacteria has good nitrogen and phosphorus removal effect, the domestication screening method of the invention solves traditional conflict of competition between denitrifying bacteria and dephosphorizing bacteria. The enriched domestication method for the aerobic denitrifying phosphorus accumulating bacteria is simple, easy to operate, short in domestication cycle and significantly higher in screening efficiency.

Description

technical field [0001] The invention belongs to the field of sewage treatment and environmental protection, and more specifically relates to a domestication and screening method for aerobic denitrifying phosphorus-accumulating bacteria for treating low C / N ratio sewage. Background technique [0002] As the eutrophication of water bodies becomes more and more serious, the state has introduced or supplemented sewage discharge standards, especially stricter discharge standards for nitrogen and phosphorus. The traditional biological phosphorus and nitrogen removal treatment is basically based on the combination of biological nitrification, denitrification and biological phosphorus removal mechanism. Denitrification and denitrification are two different biochemical mechanisms, and there are fundamental contradictions, such as the competition of carbon sources, the concentration of dissolved oxygen, and the residence time of sludge. With the downward trend of the C / N and C / P rati...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a domestication and screening method of aerobic phosphorus accumulating bacteria for treating low C / N ratio sewage, which is separated, domesticated and screened out from the bottom mud of black and odorous water bodies. An aerobic phosphorus-accumulating bacterium, which has a good dephosphorization and nitrogen removal effect, thereby solving the conflict between nitrifying bacteria, denitrifying bacteria and phosphorus-removing bacteria competing for carbon sources in the traditional nitrogen and phosphorus removal process, and solving The traditional nitrogen and phosphorus removal is highly dependent on carbon sources, the technical problems of low phosphorus removal efficiency and large sludge output

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