Abstract:

Aiming at the situations that coagulation effectiveness gets low easily，due to the water quality of raw water，and water quantity，it is necessary to adjust the dosage of coagulant timely and accurately. In order to make the water quality reach the best，a series of simulated coagulation experiments have been carried out. The effect of different coagulant dosages on the removal efficiency of raw water turbidity is investigated. Based on the coagulation experimental data，which were obtained from the conventional water quality experiments made by water treatment plants，and coagulatio curve graphs，three ways of determining the best dosage of coagulant are proposed. It is a new attempt at using coagulants effectively and running water supply plants economically，so as to reach the goal of reducing expenditures and lowering consumptions.

Key words: reference point of coagulation test, inflection point of turbidity removal, selection method of best efficiency point, selection method of quality control point, selection method of economic point

摘要：

针对水厂运行过程中原水水质、水量变化容易引起混凝效果下降的情况，为了及时准确调节混凝剂的投加量，使出水水质达到最优，进行了一系列模拟实际水厂运行的混凝实验，考察了不同混凝剂投加量对原水浊度去除率的影响。并以净水厂常规水质实验中混凝实验数据结果、混凝曲线图为参考，提出净水厂生产运行中三种关于混凝剂投加量的选择方法，就如何高效地使用混凝剂，使其既能高效发挥作用，同时寻求允许条件下的最低使用量，达到节支降耗、经济运行目的，作出新的尝试。

关键词: 混凝实验参考点, 去浊率拐点, 最佳效果点选择法, 质控点选择法, 经济点选择法

CLC Number: 

• X703.1