Method of treating emulsion liquid waste water using industrial spent acid

Abstract

A process for treating the waste emulsion with the used acid generated by pickling includes such steps as adding the said used acid to the waste emulsion which stirring, laying aside for 18-36 hr, separating upper oil layer from water, adding calcium carbonate to the water, laying aside for 2-12 hr, regulate adding lime water to pH to 7-9, laying aside for 18-36 hr, and draining off the upper water layer. Its advantages are low cost and using the recovered oil as fuel of boiler.

Description

technical field [0001] The invention belongs to the treatment of industrial emulsified wastewater, in particular to a method for treating emulsified wastewater with industrial waste acid. Background technique [0002] Most of the coolants in the machining industry are oil-water emulsions, and the used emulsions are basically discharged directly, which causes a lot of water pollution. At present, with people's emphasis on environmental pollution, the requirements for sewage discharge are getting higher and higher. At present, the commonly used treatment methods for emulsion wastewater include coagulation and electrolysis. The coagulation method is to add chloride salt to the emulsion wastewater to achieve the effect of demulsification and precipitation; this method has high treatment costs, high oil content and COD value in the treated water, and it is difficult to further purify . The main problem of the electrolysis method is that the processing cost is too high and it i...

AI Technical Summary

Problems solved by technology

The coagulation method is to add chloride salt to the emulsion wastewater to achieve the effect of demulsification and precipitation; this method has high treatment costs, high oil content and COD value in the treated water, and it is difficult to further purify

The main problem of the electrolysis method is that the processing cost is too high and it is difficult to use it on a large scale.