Purification method of mixed water body with algae and silt

Abstract

The invention discloses a method for clarifying a mixed water body containing algae and sand. Firstly, inorganic flocculating agent is added into the mixed water body containing the algae and the sand, and is evenly mixed through a pipeline mixer to generate flocculation, then organic flocculating agent is added after a plurality of small flocculating conglomerations are produced, and is evenly mixed through the pipeline mixer to form a coagulated water body containing large flocculating conglomerations, wherein, the adding amount of the inorganic flocculating agent is 0.0005 to 0.0100 percent of the weight of the water body, and the adding amount of the organic flocculating agent is 0.0001 to 0.0030 percent of the weight of the water body. Then the coagulated water body is drawn into a single-segment sedimentation pond for sedimentation treatment, and water overflows from the upper layer of the sedimentation pond, enters a fine filter chamber, and passes through a quartz sand and anthracite filtering layer for fine filtration treatment, thereby obtaining clear water with SS less than or equal to 5mg / L and a turbidity less than or equal to 1.

Description

technical field [0001] The invention relates to a method for purifying polluted water, and the method of the invention is particularly suitable for purifying mixed water containing algae and sediment. Background technique [0002] With the rapid development of the economy, the environmental pollution caused by it has attracted great attention from all aspects of the society. Many lakes in China, such as the "pearl of the plateau" - Dianchi Lake, have experienced "eutrophication", and the water contains a lot of overgrown algae. For a long time, the purification and treatment of polluted water bodies like Dianchi Lake has been a difficult problem. The true specific gravity of algal matter is small, so it is suitable to be treated by "flocculation-air flotation tank", but the treatment effect of "flocculation-sedimentation tank" is not good. And when the lake water body containing more algae flows for a certain distance along the lake outlet channel, a large amount of sedime...

AI Technical Summary

Problems solved by technology

The sediment is really heavy, and its processing requirements are just opposite to those of algae. It is suitable to use "flocculation-sedimentation tank" for sediment treatment, but the treatment effect of "flocculation-air flotation tank" is not good. This is a dilemma.

[0003] When the water body reaching the downstream water intake position contains both a lot of algae and a large amount of sediment, the existing technology generally adopts "adding inorganic flocculants for flocculation, and using a single-stage air flotation tank or a single-stage settling tank for liquid-solid separation. Then carry out the process of "fine filtration treatment", the concentration of suspended solids (SS, the same below), turbidity and other indicators in clean water are difficult to meet the standards, and are not applicable

If the two-stage pool (serial connection) treatment process of the air flotation tank and the sedimentation tank is adopted, on the one hand, the equipment investment is large, and on the other hand, both the air flotation tank and the sedimentation tank need to add a large amount of flocculation agents separately, and the process is long and the operation cost is high. The total cost of processing is high, which restricts the practical application

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