滇池草海疏浚底泥脱水实验

环保疏浚技术已成功应用于滇池水体污染防治.由于疏浚底泥中含水量高且渗透系数小,自然干化固结过程缓慢,严重影响工程进度及底泥资源化利用.为使滇池疏浚底泥快速脱水,为底泥的处置提供一条简易可行的技术途径,采用硫酸铝和聚合氯化铝为脱水药剂进行实验研究.结果表明,硫酸铝的脱水效果好,滇池疏浚底泥样品中Al2(SO4)3的最佳投加量为380 mg/L,上清液可达到GB 18918-2002的一级B标准,可直接排放至自然水体而不会造成污染.

Experimental Research on Dewatering of Dredged Sediments from Dianchi Lake

Environmental dredging technology has been applied successfully to water pollution prevention in Dianchi Lake.However,the dredged sediment has high moisture content and low permeability coefficient,which leads to the slow consolidation and affects the progress of project and utilization of dredged sediment.In order to improve dewatering rate of the dredged sediment and supply a feasible route for sediment treating,it has used aluminum sulfate and polyaluminium chloride and PAM as the dewatering flocculant to do the research.The results showed that the dewatering rate by adding aluminum sulfate was better than adding polyaluminium chloride and PAM and the optimum amount of aluminum sulfate during is 380 mg/L,the obtained supernatant quality at the amount can meet the discharge standard of first-rate B issued in GB18918-2002,which means the supernatant can be discharged directly to the environment.