强化混凝处理填埋场渗滤液尾水的可行性研究

Feasibility of Enhanced Coagulation in Polishing Landfill Leachate Effluent

对常规混凝剂(聚合氯化铝、氯化铁、硫酸铝)和新型磺酸类复配混凝剂处理填埋场渗滤液尾水进行了强化混凝的最佳参数确定、效能对比和经济成本核算,目的是研究强化混凝处理渗滤液尾水的可行性。试验结果表明:磺酸类复配剂对尾水中COD的去除效果最好,对COD的最高去除率为63.2%,出水COD为138 mg/L,但其药剂费用最高(11.26元/t);氯化铁和聚合氯化铝强化混凝对尾水中COD的最高去除率分别为60.8%和53.6%,药剂费用分别为3.756和3.11元/t;硫酸铝强化混凝效果最差,对COD的最高去除率为34.7%,药剂费用为0.806元/t。磺酸类复配剂和氯化铁强化混凝出水COD浓度接近《生活垃圾填埋场污染控制标准》(GB 16889—2008)的要求,为填埋场渗滤液尾水的深度处理提供了一条新思路。

The ohjective of this research is to assess the teasibility of enhanced coagulation, including polyaluminium chloride, ferric chloride, aluminium sulfate and new sulfonie complex coagulant in polishing landfill leachate effluent. Each coagulant was tested in terms of determining optimal parameters, comparing treatment efficiencies and cost calculation of enhanced coagulation. The results show that the new sulfonic complex coagulant has the highest COD removal efficiency, the removal rate is 63.2%, COD in the effluent is 138 mg/L, but the chemicals cost （ 11.26 Yuan per ton） is the highest. The removal rates of COD by ferric chloride and polyaluminum chloride are 60.8% and 53.6%, and the chemicals costs are 3. 756 Yuan per ton and 3.11 Yuan per ton, respectively. The enhanced coagulation efficiency with aluminum sulfate is the lowest, the removal rate of COD is 34.7%, and the chemicals cost is 0. 806 Yuan per ton. After the enhanced coagulation with sulfonic complex coagulant and ferric chloride, COD concentrations are close to the Standard for Pollution Control on the Landfill Site for Domestic Waste （GB 16889 -2008）. The enhanced coagulation can be used as a promising option in polishing landfill leachate effluent.