Abstract:

The flocculation of the effluent of acrylic fiber wastewater by biochemical treatment has been carried out.Based on comparison，it is determined that FeCl3 should be used as its flocculant. The effects of the dosages of FeCl3 and PAM and the pH on flocculating effectiveness and the effect of stirring speed on the floc are investigated. Theresults show that the floc formed can be the most optimum，when FeCl3 mass concentration is 90 mg/L，PAM mass concentration 2.1 mg/L and stirring speed 80 r/min. Both of the indexes of effluent COD and turbidity can meet the requirements of the subsequent membrane separating treatment. In this case，the COD removing rate is higher than22%，and the accounting cost is CNY0.14 per cubic meter，having feasibility.

Key words: FeCl3, flocculation, particle size distribution, floc strength, fractal dimensions

摘要：

对腈纶废水生化出水进行混凝处理,通过比较确定三氯化铁为絮凝剂,考察了三氯化铁投加量、助凝剂聚丙烯酰胺投加量、pH对絮凝效果的影响及搅拌速度对絮体的影响。结果表明:当三氯化铁投加质量浓度为90 mg/L,PAM投加质量浓度为2.1 mg/L,搅拌速度为80 r/min时形成的絮体最理想,出水COD、浊度等指标均能满足后续膜分离处理的要求,COD去除率达到22%以上。核算药剂成本为0.14元/m3,具有可行性。

关键词: 三氯化铁, 混凝, 粒径分布, 絮体强度, 分形维数

CLC Number: 

• X703