In recent years,in order to treat urban sewage,the construction of sewage treatment plants has been heating up. Large-scale sewage treatment plants can indeed reduce the COD reduction of urban domestic sewage in a short period of time.However,in some places,urban domestic sewage passes through fish ponds and natural wetlands,ecological purification,COD concentration can also be greatly reduced.
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Emission reduction measures should be adapted to local conditions and a combination of multiple methods