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...

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