Oil-containing wastewater electro-flocculation depth air-floatation system

Abstract

The invention relates to an oil-containing wastewater electro-flocculation depth air-floatation system. According to the oil-containing wastewater electro-flocculation depth air-floatation system, a scum scraper in the electro-flocculation system is located at the upper part of an electrolysis tank, and is used for treating solid waste produced by flocculation and air flotation of equipment, so that the scraped scum is discharged from a scum outlet, and up-to-standard clear water is discharged from a clear water outlet. In a dissolved air flotation system, a flocculant is added in a water inlet pipe section of a dissolved air floatation tank, so that a large amount of suspended matter in discharged water is flocculated, and the generated flocculates are wrapped by a large amount of micro bubbles which are generated by mixing water and vapor under a high pressure via an air dissolving pump and sending the mixed water vapor to a release device for releasing, thus the wrapped flocculatesfloat upwards to a water surface, and are removed by the scum scraper, and finally the discharged water overflows to a clear water tank. The electro-flocculation depth air-floatation system employs three-stage serial demulsification, is good in demulsification effect, and has a wide equipment application range. The equipment can be improved based on water to be processed, for example, the electrolysis current and the electrode plate number are increased or reduced, the spacing, size and thickness can be adjusted. After second-stage depth air flocculation, the removal rate of COD is up to about90%, and the removal rate of oil substances is up to 95% or more.

Description

technical field [0001] The invention relates to the technical field of oily emulsion wastewater treatment, in particular to an electric flocculation deep air flotation system for oily wastewater. Background technique [0002] Emulsions are widely used in mechanical processing, automobile engine processing, cooling and lubrication of rolling rollers and steel plates. As a kind of difficult-to-treat industrial wastewater, emulsion wastewater has extremely high chemical stability and pollution load. Relevant data show that the oil concentration in the emulsion wastewater is as high as 15000-20000mg / L, the COD is 18000-35000mg / L, and the BOD is 5000-10000mg / L. To improve the performance of the emulsion, a large number of additives, such as oily additives, need to be added , extreme pressure additives, anti-rust additives, anti-mildew additives, anti-foam additives, etc., make the composition of the emulsion extremely complex and difficult to handle. At present, the treatment of...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems of unstable demulsification, high equipment consumption and unstable water quality in the existing electrochemical demulsification, the purpose of the present invention is to provide a deep air flotation system for electric flocculation of oily wastewater to solve the deficiencies in the prior art

Images