Coagulation method for raw water with low turbidity and low organic matter content

Abstract

The invention belongs to the technical field of water purification processes, and discloses a coagulation method for raw water with low turbidity and low organic matter content. The method comprises:adding ferric chloride into water source water according to a certain metering ratio, quickly mixing for a certain time, controlling the pH value of the water body after the mixing is completed, adding polyaluminium chloride according to a certain metering ratio, quickly mixing for a certain time, making the mixed water body enter a first-stage flocculation tank, completing first-stage flocculation at a certain rotating speed within a certain time, entering a second-stage flocculation tank, and completing second-stage flocculation tank at a certain rotating speed within a certain time; and making the water body subjected to second-stage flocculation enter a precipitation tank, and entering a clear water tank after being precipitated in the precipitation tank for a certain time. According to the invention, the feeding mode of the water purifying agent for water source water with low turbidity and low organic matter content and the coagulation process parameters are defined, the problemsthat the floc is not compact, the more floc float, the water before filtration is high in turbidity and the water source water easily penetrates through the filtration tank due to the poor coagulation effect when the water source water with low turbidity and low organic matter content is treated by the existing process of the tap water supply plant are solved, and the technical support is provided for upgrading and reconstruction of the process of the water supply plant.

Description

technical field [0001] The invention belongs to the technical field of water purification technology, and in particular relates to a coagulation method suitable for raw water with low turbidity and low organic matter. Background technique [0002] At present, the water purification process of the waterworks is mainly to make the fine suspended particles and colloidal particles gather into coarser particles and settle down to separate from the water by adding water purifiers to purify the water. Among them, the water purifiers mainly include iron salts and aluminum salts. Ferric chloride of iron salts and polyaluminum chloride of aluminum salts are relatively common water purifiers, which are used frequently and often used in water plants. It is designed according to these two water purifiers. [0003] These two water purifiers can play a very good role in treating raw water with general turbidity. However, when dealing with raw water with low turbidity and low organic matte...

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Problems solved by technology

[0004] The present invention focuses on solving the problems of unreliable flocs, more floats, high turbidity of pre-filtered water, and easy penetration of filter tanks caused by poor coagulation effect when the existing process of the waterworks is used to treat source water with low turbidity and low organic matter. The problem is to provide a coagulation method suitable for raw water with low turbidity and low organic matter, clarify the water purifying agent dosing method and coagulation process parameters suitable for source water with low turbidity and low organic matter, and provide guidance for water plant process upgrading. Technical Support

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