Method and apparatus for treating high-concentration emulsion wastewater

Abstract

The invention discloses a method for treating high-concentration emulsion wastewater. The comprises the following steps: the high-concentration emulsion wastewater is filtered by an inorganic membraneto perform oil-water separation in order to obtain an inorganic membrane liquid concentrate and a clear liquid; the clear liquid enters a catalytic oxidation system and undergoes catalytic oxidationtreatment; catalytic oxidation treatment effluent is adsorbed by activated carbon, enters an ultrafiltration membrane device, and is ultrafiltered to obtain an ultrafiltered liquid concentrate and ultrafiltration membrane effluent; the ultrafiltered liquid concentrate returns to the catalytic oxidation system, and is mixed with a supernatant, and the obtained mixture is oxidized; and the ultrafiltration membrane effluent enters a reverse osmosis membrane device, and undergoes reverse osmosis treatment to obtain a reverse osmosis liquid concentrate and a permeate, and the reverse osmosis liquidconcentrate returns to the catalytic oxidation system and is oxidized. The inorganic membrane adopted in the method can resist high oil and high solid content treatment during separation, and the whole system has a good stability and a strong impact resistance; and a catalytic oxidation technology adopts a small amount of reagents, is a pure chemical treatment technology, and does not produce liquid concentrate, sludge or other pollutants.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment method and device for high-concentration emulsion wastewater. Background technique [0002] Emulsions are widely used in metal processing such as grinding and forging, and their main functions are lubrication, cooling, surface cleaning and corrosion protection. With the prolongation of the use time, the alternation of cold and heat and microbial degradation will cause it to deteriorate and lose its original characteristics and effectiveness, so it needs to be replaced periodically, thereby continuously producing waste liquid that needs to be treated. [0003] The main components of the emulsion are base oil (mineral oil, vegetable oil and synthetic oil), fatty acid, surfactant (non-ionic and anionic), co-surfactant, anti-corrosion agent, bacteriostat and various additives. Due to different purposes, there are many types, and even for the same purpose, ...

AI Technical Summary

Problems solved by technology

[0005] 1. The demulsification effect is unstable, and the oil content of the clear liquid after air flotation and precipitation is high, which affects the subsequent treatment process;

[0006] 2. Air flotation or coagulation sediment can only be used for hazardous waste treatment, and the water content is high, which makes the treatment cost higher;

[0007] 3. It is difficult to dehydrate and solidify the sediment by conventional processes, which seriously affects the normal operation of dehydration equipment (plate and frame filter press);

[0008] 4. The operation of the biochemical system is unstable. Due to the high oil content, the oxygen content in the water body is low, which easily leads to the paralysis of the biochemical system

Patent CN103030252A discloses a membrane treatment process for emulsion wastewater. Although the final effluent quality of this method is better; but this method will produce membrane concentrate that cannot be processed, which will cause pollution to the environment

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