老城区排水多采用盖板沟将雨污水直排至附近水体的混流排水方法,对附近水体造成了很大的污染。为此在老城区改造中采用截流式合流制排水方式,即通过截流井将污水和初期雨水截流至污水管网,排到污水处理厂;后期雨水溢流至雨水管,排到附近水体,一定程度上实现了雨污分流,保护了附近水体。 Drainage in the old urban district often uses the ditches and ditches to direct rainwater and sewage to the mixed flow and drainage of nearby water bodies, causing great pollution to nearby water bodies. To this end in the transformation of the old urban area using the closure of the merger drainage system, that is, through the intercepting of wells and the initial drainage of sewage and sewage intercept to the sewage pipe network, discharged to the sewage treatment plant; late rain overflow to the rainwater pipes, discharged to nearby water bodies, to a certain extent On the realization of the diversion of rain and sewage, protecting the nearby water body.