不同原水条件下水厂的混凝过程研究

Coagulation Process of Different Raw Water in Waterworks

为了考察原水性质对混凝过程的影响,对南方某市4个水厂的混凝过程进行了调研。结果表明,4个水厂的原水呈现不同的水质特征,其中A、B水厂原水(湖泊水)的浊度比C、D水厂原水(长江水)的要低,而有机物浓度比C、D水厂原水的要高;4个水厂原水中的有机物组成类似,均是腐殖酸所占比例最大(50%左右)。A、C水厂各混凝段的浊度随着混凝反应的进行呈下降趋势,而B、D水厂各混凝段的浊度无下降趋势,甚至略有上升;A水厂滤池出水的DOC浓度明显下降,较原水下降了55.44%,而其余3个水厂的DOC浓度下降不明显;混凝过程对大分子质量有机物的去除作用明显。

Coagulation processes of four waterworks in South China were investigated in order to explore the influence of raw water on the coagulation process. The results indicated that the characteristics of raw water were different. The turbidity of raw water in waterworks A and B was lower than that of waterworks C and I), while the dissolved organic carbon ( DOC ) concentration of raw water in waterworks A and B was higher than that of waterworks C and D. The organic matter composition of different raw water was similar to each other, and the proportion of humic acid was always the largest ( about 50%). The turbidity of each coagulation section in waterworks A and C decreased with the progress of coagulation reaction, but no decrease profile of waterworks B and D was detected, which even increased slightly. The effluent DOC concentration of the filter in waterworks A decreased significantly by 55.44%, while no obvious decrease of DOC was detected in the other three waterworks. In addition, the coagulation process had obvious removal effect on large molecular weight organics.