Regarding the current drainage situation of the old community,the traditional drainage ditch along the edge of the building wall is sponge transformed,and a rainwater purification system from top to bottom is constructed by adopting a variety of filtration and adsorption technologies.The field test results showed that the COD,SS,TP and NH3-N contents of the initial rainwater were reduced by more than 80%,especially the SS removal rate could reach 97.8%.The effluent quality was better than the municipal miscellaneous water and landscape water quality standards,and the unit use and maintenance cost was reduced by 10%—14%.
old communitysponge transformationtraditional drainage ditchnew drainage ditch
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