聚硅酸硫酸铁强化混凝去除微污染水源水中天然有机污染物

应用强化混凝技术,降低原水中有机物含量,是控制消毒副产物生成的有效途径之一。通过混凝搅拌试验,评价了聚硅酸硫酸铁混凝剂对原水中有机污染物的去除效果,考察了混凝剂投加量、pH值等对去除效果的影响。结果表明：聚硅酸硫酸铁去除有机物和除浊能力明显优于硫酸铁、聚合硫酸铁,其适宜的投药量范围和pH值范围宽;聚硅酸硫酸铁在混凝过程中形成的矾花较大,沉降速度快,因而可缩短处理水在构筑物中的停留时间,提高系统的处理能力;此外,通过正交实验确定了聚硅酸硫酸铁混凝剂的最佳水力条件。

Natural Organic Pollutants Removal from Micro-Pollution Water Resource by Enhanced Coagulation with Polysilicate Ferric Sulfate

Enhanced coagulation that is used for reducing the content of organic compound in raw water is known as one of the effective methods to control the formation of disinfection by-products.The removal efficiency of organic compounds in raw water by polysilicate ferric sulfate PSFS was evaluated in the paper by jar test and the effects of coagulant dosage and pH value on the removal efficiency were studied.Experimental results indicated that the capacity of PSFS for organic matter and turbidity removal were obvious higher than that of some other coagulants such as ferric sulfate and polyferric sulfate.The suitable range of coagulant dosage and pH value for PSFS were wider.The flocs formed in the coagulation process for PSFS was big and its setting velocity was fast so the retention time for the water sample in treatment equipment can be shortened and the treatment capacity of the system can be increased.In addition,the optimum hydrodynamics conditions for PSFS were selected by using orthogonal tests.