Method for sewage treatment through co-agglomeration gas flotation method

Abstract

The invention relates to a sewage treatment method, in particular to a method for sewage treatment through a co-agglomeration gas flotation method, which integrates a clarification function with a gas flotation function together. The method comprises the following steps: (1) feeding raw water to a primary flocculation zone to be flocculated; (2) feeding the water to a secondary flocculation zone for contact agglomeration, and further conducting agglomeration gas flotation; (3) feeding the water to a gas flotation contact zone, conducting contact agglomeration on the gas trapped flocculation particles with gas dissolved water released by a releaser, enabling the the gas trapped flocculation particles to be in full contact with microbubbles to form co-agglomerated large bubble flocculation; (4) feeding the water to a solid-liquid separation zone. The method disclosed by the invention has the benefits that the conventional mechanical agitation clarification tank is organically combined with the gas floatation technology, the method organically combines the working procedures comprising mixing, primary flocculation, secondary flocculation, gas floatation, settling, and sludge reflux contact flocculation together; the gas dissolved water microbubbles directly participate in agglomeration and are co-agglomerated with flocculation to become large; the bubbles are placed inside the flocculated particles, so that the effect of agglomeration of the bubbles is fully played and the bubbles are firmly adhered to the flocculated particles to achieve co-agglomeration gas flotation.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method for treating sewage by a copolymerization air flotation method integrating clarification and air flotation functions. Background technique [0002] At present, the problem of reservoir water pollution is becoming more and more prominent, among which algae pollution is particularly serious. At present, the reservoir water tends to have the characteristics of high algae in summer and low temperature and low turbidity in winter. As the degree of eutrophication of water sources increases year by year, algal blooms are becoming more and more serious, especially in spring and autumn when the temperature changes greatly, algae outbreaks occur from time to time, posing a certain threat to the operation of water plants and water supply safety. The density of algae is small, and it is difficult to effectively remove it by traditional coagulation, sedimentation, and filtration processe...

AI Technical Summary

Problems solved by technology

However, the traditional air flotation technology adopts the method of one-time reflux of dissolved air water, that is, the raw water is fully coagulated and then refluxed into dissolved air water. Microbubbles do not participate in the coagulation process of particles. The collision contact lag and short contact time are equivalent to the secondary flocculation of microbubbles and flocs. The efficiency is not high, and the effective utilization rate of microbubbles is low

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