Method and device for culturing aerobic biofilm capable of treating low-concentration ammonia nitrogen in water body

Abstract

The invention belongs to the field of water environmental protection and particularly relates to a method and a device for culturing an aerobic biofilm capable of treating low-concentration ammonia nitrogen in a water body. By adopting a method of combining solid culture with liquid culture, inoculated microbial strains with a nitrifying function are enabled to grow stably under conditions of no organic carbon source and low ammonia nitrogen concentration. After the microbial strains are reproduced, the microbial strains are continuously released into culture solution through two open ends of a silicone tube and holes on a tube wall. With the flow of the culture solution, the microbial strains are in continuous contact with carriers at the middle part of a culture reactor to form the aerobic biofilm capable of treating low-concentration ammonia nitrogen and the aerobic biofilm which has high affinity to the elimination of the low-concentration ammonia nitrogen in the water body can be rapidly cultured. Since the nitrifying strain biofilm is formed under the culture condition of low-concentration ammonia nitrogen, the biofilm has high affinity to the elimination of the low-concentration ammonia nitrogen and the nitrifying process of the low-concentration ammonia nitrogen can be obviously accelerated.

Description

technical field [0001] The invention belongs to the field of water environment protection, and in particular relates to a method and device for cultivating aerobic biofilms for treating low-concentration ammonia nitrogen in water bodies, in particular to a method of combining solid phase and liquid phase culture, which is cultivated for use on the ground surface Aerobic biofilms removed by nitrification of low concentrations of ammonia nitrogen in water bodies (such as lakes, rivers, reservoirs and ponds). Background technique [0002] The environment is the basis for the survival and development of human beings. However, with the acceleration of industrialization and urbanization, excessive ammonia nitrogen enters the water body, seriously polluting the water body environment. Ammonia nitrogen is a nitrogen-containing compound that exists in water in two forms, ionic and non-ionic. In natural and uncontaminated rivers and lakes, levels of nitrogenous compounds tend to be l...

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Problems solved by technology

[0006] It should be noted that it is difficult to cultivate aerobic biofilm suitable for low concentration ammonia nitrogen removal.

In order to make the cultured biofilm have high nitrification activity under the condition of low concentration of ammonia nitrogen, the concentration of ammonia nitrogen in the culture solution should also be very low, because the culture solution with high concentration of ammonia nitrogen will usually domesticate the biofilm with the activity of removing high ammonia nitrogen concentration, but the removal of low Low activity and low rate at ammonia nitrogen concentration

The success rate is not high when the culture medium with low ammonia nitrogen concentration is used for cultivation, because the inoculated bacteria are easily lost, resulting in the failure of the cultivation process

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