混凝沉淀工艺对残余铝去除的影响

本文通过饮用水除铝的一系列实验，主要研究在给水处理流程中聚合铝(PAC)混凝剂种类、投加量、余浊等因素对余铝的影响。混凝剂性能优劣应从除浊和除铝两方面来评价。除铝最佳投药量要低于除浊最佳投药量。提出除铝可以分为降低溶解铝和去除颗粒铝两种途径。余浊和余铝在一定范围内呈线性相关关系，此时除浊能同时有效去除颗粒铝。在此基础上对水厂生产运行提出了一些建议。

REMOVAL OF RESIDUAL ALUMINIUM BY COAGULATION AND SEDIMENTATION PROCESSES

The effect of the kinds and dosing quantity of PAC coagulant and residual turbidity etc on residual aluminium in the course of water supply was studied through a series of experiments for aluminium removal for drinking water. The performance of coagulant should be evaluated from two respects of turbidity and aluminium removals. The optimal dosing quantity for aluminium was lower than that for turbidity removal. Two ways to remove aluminium were put forward, which could be divided into lowering dissoluble aluminium and removing particulate aluminium. To a certain extent, residual turbidity is linear relationship with residual aluminium; at that time, the way to remove turbidity could effectively remove aluminium particulates.