疏浚底泥脱水工程排放尾水处理的关键技术

Key Construction Technology for Treatment of Sediment Dewatering Consolidation Tail Water in Environmental Dredging

环保疏浚工程污染底泥脱水固结后产生大量悬浮物浓度高的尾水,若直接排放则会破坏生态环境造成二次污染。将物理方法与化学方法相结合,通过对尾水处理量及处理场地空间布局进行综合性分析,设置了两个串联的尾水池,交错设置若干道隔墙形成"S"形过流通道,并在过流通道间设置不同型式格栅,通过延长流径和降低流速促进了悬浮颗粒物的沉降,同时增强了絮凝沉淀法的吸附作用,降低了尾水污染物浓度,实现了尾水高效、低成本处理后达标排放。

After the dewatering and consolidation of contaminated sediment,a large amount of tail water with high suspended matter concentration will be produced. If discharged directly,it will destroy the ecological environment and cause secondary pollution. Physical and chemical methods were combined to achieve high efficiency and low cost of tail water discharge up to standard. Based on the comprehensive analysis of tail water treatment capacity and spatial layout,two tailing ponds connected in series were set up scientifically and reasonably,and several partitions were interlaced by grilles to form 'S'shaped flow passage. The settlement of suspended particles was promoted by lengthening the flow path and reducing the flow rate, and the adsorption of flocculation and precipitation was also enhanced, thus the concentrations of pollutants in tail water were reduced.