Method and device for removing algae by applying micro-bubble air flotation of multiphase flow pump

Abstract

The invention relates to a method for removing algae by applying micro-bubble air flotation of a multiphase flow pump. The method comprises the following step of releasing air dissolved water below a water body containing an algal layer, wherein the air dissolved water is formed in such a way that air and natural water simultaneously enter the multiphase flow pump under the action of negative pressure, dispersed air is cut many times by using a multistage impeller rotating at high speed in the multiphase flow pump, the air is instantly dissolved into the natural water in a highly dispersed state in a high pressure environment in the multiphase flow pump and rapidly saturated, and then is stabilized and contacted by an air dissolved tank for 50seconds-1hour, and the air dissolved water contains a great number of micro air bubbles with the diameter of small than 30mum, and the air dissolved water is released by decompressing to a position 0.3-1.2m away from the downside of the water body containing the algal layer. The method has the advantages of ideal air flotation effect achieved without adding a coagulant, no secondary pollution, no limitation of minimum water treatment quantity, simple process equipment, low device energy consumption and high system operation stability.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a device for removing algae by micro-air floatation using a multiphase flow pump and a method for removing algae. Background technique [0002] Algae pollution refers to the biological pollution caused by algal blooms and high clusters. With the rapid development of industry and agriculture, excessive nutrients such as nitrogen and phosphorus enter the water body through various channels, resulting in increasing eutrophication of lakes (reservoirs). The eutrophication of water body can easily lead to the explosive reproduction of algae in summer, produce peculiar smell, destroy the water body landscape, seriously affect the drinking safety of fresh water and the tourism value of the lake; the algae growth process consumes a large amount of dissolved oxygen, which will cause suffocation and death of aquatic animals, resulting in Algae toxins directly ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a micro-air flotation removal method using a multi-phase flow pump to solve the problems of the current application of air flotation technology to remove algae, such as extremely low removal efficiency, need to add coagulant, relatively complicated equipment, and unstable operation. algae method

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