摘要：

采用微砂强化结团絮凝工艺处理模拟废水，研究了水力停留时间、处理量、投药量、加砂量对除浊性能的影响，并分析了载体增效絮体的形成机理。结果表明，凝聚池、加注池+熟化池、沉淀池以及总体装置的水力停留时间之比为1：3：7.3：11.3，浊度去除率与进水流量具有负相关性，PAC最佳投药量为1 g/L；最优投药量、加砂条件下的连续运行浊度去除率保持在98.5%~99.5%、处理出水浊度保持在1.7 NTU以下，明显优于上述最优投药量、不加砂条件时的连续运行处理效果，较好地展示了所加微砂的增效絮凝作用。

关键词: 载体絮凝, 微砂增效, 絮凝沉淀

Abstract:

Microsand enhanced pelleting flocculation process has been used for treating simulated wastewater. The influences of hydraulic retention time,treatment capacity,flocculant dosage,and the dosage of sands added on turbidity removing capacity are investigated,and the forming mechanism of synergistic ballasted flocs are analyzed. The results show that the hydraulic retention time ratio of coagulation tank, injection tank+maturation tank, precipitation tank,and the overall devices is 1:3:7.3:11.3. Negative correlation is found between turbidity removing rate and influent flow rate. The optimum PAC dosage is 1 g/L. Running continuously under optimum dosages and sand adding conditions,the turbidity removing rate keeps at 98.5%-99.5%. The turbidity of treated effluent is below 1.7 NTU,obviously superior to the continuously running treatment effect above optimum dosage when sands are not added. The synergistic ballasted flocculation action of the microsands added is showed better.

Key words: ballasted flocculation, microsand synergy, flocculation precipitation

中图分类号: 

• X703