环保疏浚堆场余水处理生产性试验研究

介绍了环保疏浚底泥堆场和强化自然沉淀的设计方法，并针对环保疏浚工期短、产生的余水量大及其悬浮物含量高的特点，对不同余水处理技术进行了对比分析，选择了加药促沉法余水处理工艺，在太湖环保疏浚示范工程堆场进行了生产规模试验.结果表明，在堆场中设置溢流堰和导流墙，改善堆场的水力条件，延长水流路径，有利于颗粒的自由沉降，提高了颗粒在堆场中的沉淀效率.向输泥管投加絮凝剂，使其在输泥管中快速混合，在堆场中反应、沉淀；向堆场出水投加絮凝剂，通过隔板混合池快速混合，折流反应池反应，在沉淀池中沉淀，这2种投药方式都能保证余水达标排放，其中向堆场出水投加絮凝剂的方式加药量少且容易控制出水水质. 

Full-Scale Experimental Research on Residual Water Treatment for Environmental Dredging

The design methods of Confined Disposal Facilities(CDF) and intensified natural sedimentation for environmental dredging were presented.Aiming at the characteristics of environmental dredging including time limit short for a project,much residual water quantity and high suspended solids concentration,different residual water treatment processes were compared and analyzed.The treatment process of adding flocculants were chosen and full-scale experiments done in the CDF of Taihu Wuli Lake environmental dredging.Experimental results show that weir and partition settled in the CDF can improve hydraulic condition,extend the hydraulic retention time,be favorable to free settlement of particles,and improve the sedimentation rate of particles.Flocculants can be added to sludge pipe,mixed rapidly and then flocculated and settled in the CDF,or they can be added to discharge outlet,mixed in the clapboard tank,flocculated in the reciprocal baffled flocculating tank and settled in the horizontal flow sedimentation tank.Both the means can ensure the residual water to meet the effluent standard.It needs fewer flocculants and is easier to control discharge quality if adding flocculants to the discharge outlet.