环保疏浚余水处理试验研究

Experimental Research on Residual Water Treatment for Environmental Dredging

环保疏浚是治理重污染水体的重要手段,在疏浚过程中产生了大量富含污染物的余水,对余水的处理成为环保疏浚二次污染防治的重要内容之一。通过室内模拟试验和生产性试验,进行了不同投药方式的对比,并筛选、复配了适合余水处理的絮凝剂。试验结果表明,输泥管投加絮凝剂和堆场出水投加絮凝剂都可以保证余水达标排放,堆场出水投加絮凝剂容易控制出水水质,且投加絮凝剂的费用为输泥管投加絮凝剂费用的1 10,但需在堆场外设置混凝沉淀设施。对不同絮凝剂的絮凝效果比较发现,复配絮凝剂的效果较好,余水处理的成本低,剩余ρ(SS)小。

Environmental dredging is an important means to restore heavy polluted water. Large quantities of residual water with contaminants are produced during the dredging. Residual water treatment is one of important steps to control second pollution of environmental dredging. By simulating and full-scale experiments, different ways of adding flocculants were investigated. Several flocculants that adapt to residual water treatment were selected and compounded. Experimental results show that adding flocculants both to the sludge pipe and to the discharge outlet of disposal site can attain discharge standard of residual water. It is easy for adding flocculants to the discharge outlet to control discharge quality. The expense of flocculants to be added to discharge outlet is one-tenth of that to be added to sludge pipe, but constructing the facilities for coagulation and sedimentation is indispensable. Comparing to the effect of different flocculants, the results show that composite flocculants are preferable, the expense of residual water treatment is low, and residual SS is small.