Demulsifying and flocculating treatment method of machining cutting fluid sewage water

Abstract

The invention discloses a demulsifying and flocculating treatment method of machining cutting fluid sewage water, comprising the following steps: conveying cutting fluid sewage water in an acidification pool and adding diluted sulfuric acid for acidification; adjusting the pH to be 3.5-5.5; then conveying in a demulsifying device and adding ferrous sulfate solution for demulsification and precipitation; then conveying in a neutralization pond and adding NaOH solution for neutralization; conveying in a coagulating basin after neutralization and adding a coagulating agent for coagulation; then adding polyacrylamide to a flocculation tank; flowing down by a sieve body through the square rectifying plate of the flocculation tank after flocculating; depositing through the sloped tube stuffing body of a flocculation precipitation pool; discharging out supernatant fluid from a water collection weir; and removing precipitated sludge floccule. The method has the characteristics of integrating oil removal, demulsifying and flocculating, and being thorough for pollution control, good in application effect and economic and efficient; the effluent COD (Chemical Oxygen Demand) of cutting fluid sewage water treated through the method can be decreased to below 500mg / L; and the method can be widely applied to sewage water treatment in machining industry.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a demulsification and flocculation treatment method for machining cutting fluid sewage. Background technique [0002] In the mechanical processing industry, especially in the cutting and grinding processes of door industry, bearings and auto parts processing enterprises, water-soluble emulsion (cutting cooling lubricant) is widely used, and its waste liquid has always been a serious environmental pollution. unresolved problems. With the rapid development of industry, the discharge of this kind of oily sewage is increasing day by day. In addition to the hazards of general oily wastewater, due to the effect of its surfactant, mechanical oil is highly dispersed in water, which is easier for animals, plants and aquatic organisms to absorb. Surfactants themselves are also harmful to organisms, and can also dissolve some toxic substances that are insoluble in water. In the machining proce...

AI Technical Summary

Problems solved by technology

However, with the improvement of machining cutting fluid product technology, the stability of cutting fluid sewage is getting higher and higher, and it is becoming more and more difficult to demulsify and flocculate; at the same time, the treatment method for demulsification and flocculation of cutting fluid sewage is too simple to be comprehensive Taking into account degreasing, demulsification and flocculation, most of the related sewage treatment methods have the disadvantages of poor treatment effect and incomplete pollution control

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