Engineering Scheme and Operation Solution of On-Site Storage and Disposal for Initial Rainwater
The pollution caused by the outflow of rainwater is one of the important factors for the deterioration of water quality of"two lakes"in a city.The mixed pollution of rainwater and wastewater is solved through the reconstruction of drainage pipe network,and the initial rainwater pollution and overflow pollution are solved by the engineering scheme of storage treatment.The combined process of"high efficiency sedimentation tank+BAF+high efficiency clarification tank+rotary table filter"is adopted for the initial rainwater treatment process.The applicability of intermittent operation of BAF is verified by pilot test.Under continuous operation conditions,CODCr and ammonia nitrogen can reach class Ⅳ water quality stably.When the intermittent operation,with the increase of intermittent period,the removal effect of ammonia nitrogen is greatly reduced.When the intermittent period exceeds 4 days,the concentration of ammonia nitrogen in the effluent cannot reach the surface water quality.The operation and maintenance mode of initial rainwater treatment process is put forward,which provides reference for similar projects.
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