强化混凝技术在水处理中的研究进展

Research Progress on the Enhanced Flocculation in Water Treatment

混凝过程是水处理中的重要工艺单元,强化混凝可以有效改善絮凝体的形成和沉降特性。本文简要介绍了微砂、磁粉、回流污泥3种典型的强化絮凝技术的研究现状,对其除污染效果进行了说明,表明强化絮凝过程需要考虑絮凝剂和水力条件对絮凝效能与絮体特性的影响,同时应研究混凝过程的凝聚阶段和絮凝阶段的协同性和适配性,有必要对混凝过程的凝聚阶段与絮凝阶段进行有针对性地分阶段或分级控制,深入研究分级混凝过程的特性。

Coagulation is an essential unit during the water treatment.Enhancement of coagulation is an effective approach on improving the formation and settle ability of flocs.This paper briefly introduced research status and application of three typical enhanced flocculation techniques,including the addition of micro-sand,magnetic powder and recycling sludge.Based on the illustration of coagulation performance,it suggests that the influence of coagulant and hydraulic condition on flocs properties is an important factor,especially the cooperativity and suitability should be valued,aiming at enhancing flocculation.We put forward some suggestions that are necessary to carry out a further investigation on agglomeration and flocculation separately and on the characteristics of grading coagulation.