针对利用传统絮凝沉淀法处理水电工程砂石骨料加工废水效果不理想的问题,通过室内实验研究了电絮凝处理砂石骨料加工废水中高浓度悬浮物的性能,并优化了相关的工艺参数。结果表明,铝适合用作电絮凝阳极材料,最佳电流强度和电解时间分别为0.08 A和4 min,初始悬浮物浓度宜控制在50000 mg/L以内。电絮凝前,自然沉降能够有效去除粒径在8μm以上的悬浮颗粒和总体悬浮物负荷,最佳的自然沉降时间为2 h。通过比较絮凝前后及自然沉降后的悬浮物颗粒粒径分布,发现电絮凝对粒径1~2μm的细颗粒去除性能优异。若采取沉淀+电絮凝的措施,对砂石骨料加工废水高浓度悬浮物的处理效果更佳。%Aiming at the problem of poor effect in the treatment of sand and gravel aggregate wastewater by using the conven-tional flocculation sedimentation method, the laboratory experiments were conducted to investigate the performance of suspended solids ( SS) in waste water processed by electro-coagulation method, and the corresponding operational parameters were opti-mized. The experiment research results indicated that the aluminum was suitable as anode material, the optimal current intensity and electrolysis time were 0. 08 A and 4 min respectively, and the initial SS loads should be controlled within 50 000 mg/L. Be-fore the electro-coagulation, the SS loads and suspended particle of larger than 8 μm can be removed by natural sedimentation effectively, and the optimal natural sedimentation time was 2 h. According to the comparison of the distribution of particle size before and after the treatment, it is found that electro-coagulation functions well for removing SS with particle size of 1 to 2μm. Therefore, sedimentation combined with electro - coagulation would be effective in processing the sand and gravel aggregate wastewater.
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