Integrated pre-denitrification and denitrogenation biological filter sewerage treatment process

Abstract

The invention discloses an integrated pre-denitrification and denitrogenation biological filter sewerage treatment process. The integrated process is characterized in that: the process is realized by combining an anoxic denitrification biological filter and an aerobic nitrification biological filter in tandem, first, sewage with organic substances and ammonia nitrogen is mixed with part of effluent water of the aerobic nitrification biological filter which flows back to a water inlet end, then the sewage and the effluent water pass the anoxic denitrification biological filter together, and the organic substances in the sewage are taken as a carbon source by denitrifying bacteria adhesively growing on bio-ceramsite in the anoxic denitrification biological filter to reduce nitrate nitrogen from the return water of the aerobic nitrification biological filter into nitrogen gas, thus realizing denitrification function; and the effluent water of the anoxic denitrification biological filter flows to the aerobic nitrification biological filter, and a filter material in the aerobic nitrification biological filter is adhered with special growing aerobic decarbonization microbes and the growing denitrifying bacteria which further degrade the organic substances and the ammonia nitrogen from the anoxic denitrification biological filter, thus causing content indicators of the organic substances, the ammonia nitrogen, total nitrogen and the like in the effluent water of the aerobic nitrification biological filter to meet the discharge requirement.

Description

technical field [0001] The invention belongs to the technical field of biofilm sewage treatment with a biofilter as the main body, and in particular relates to an integrated sewage treatment process that uses an anoxic denitrification biofilter and an aerobic nitrification biofilter in series without energy consumption. The removal of nitrogen by the anoxic denitrification biological filter is completed by using the denitrifying bacteria biofilm attached to the fixed bed of spherical light porous biological ceramsite, and the removal of organic matter and the nitrification of ammonia nitrogen by the aerobic nitrification biological filter The obligate aerobic carbon removal microorganisms and nitrifying bacteria biofilm on the spherical light porous biological ceramsite fixed bed are completed; this process not only has a good effect on the removal of organic pollutants in sewage, but also has a good effect on nitrogen in sewage The removal effect can directly treat domestic s...

AI Technical Summary

Problems solved by technology

However, since the current research and application are mainly focused on the single-stage and two-stage series aerobic biological filter, that is, the biological aerated filter process, they only focus on the removal of organic pollutants in sewage such as BOD, COD and The ammonia nitrogen in the sewage can only be oxidized to nitrate nitrogen, but the nitrate nitrogen cannot be converted into nitrogen overflowing from the sewage to be completely removed, that is, the total nitrogen in the sewage has not been removed, and such water is still discharged into the surface water body. It will pollute the water body and may cause eutrophication of the water body

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