Method in trophic level for controlling alga in preliminary sedimentation tank of waterworks

Abstract

The present invention belongs to an algal nutrient-level control method in presedimentation tank of waterworks, and relates to a water treatment method. Said method can be implemented by adopting the following steps: a breeding fresh water filter fishes is the presedimentation tank of waterworks; and b. continuously feeding water into the presedimentation tank in which the fresh water filter fishes are being bred, and continuously discharging water, its water-feeding quantity and water-discharging quantity are identical, and the retention time of the water in the presedimentation tank is 2-3 days. Said method can effectively solve the problem of that lots of algal phytoplankton can be produced in the presedimentation tank, and can raise the quality of discharged water.

Description

Technical field: [0001] The invention relates to a water treatment method, in particular to a method for controlling algae phytoplankton growing in a pre-sedimentation tank of a waterworks. Background technique: [0002] Water pollution makes the eutrophication of drinking water source water worsening and destroys the ecological balance in natural water bodies. The continuous deterioration of ecological conditions has caused a large number of algae and other phytoplankton to grow. normal water treatment. In order to achieve the purpose of removing algae, conventional treatment methods can be used; chemical algae removal treatment methods or air flotation algae removal treatment methods can also be used. The conventional treatment method is to increase the dosage of coagulant, which not only increases the sludge discharge volume of the sedimentation tank (or air flotation tank), but also shortens the operation period of the filter tank, increases the amount of backwash water...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that in the current method for removing algae in the waterworks, the cost of water production is increased by using the conventional treatment method, and the microorganisms in the pipe network can be reproduced again, so the water quality cannot be guaranteed; the chemical algae removal method has two problems Sub-pollution problem; the use of air flotation algae removal treatment method has increased power consumption and operating costs, and has high requirements for operation. It provides a trophic level control method for algae in the pre-sedimentation tank of the water plant.