Oil-containing wastewater treatment process combining ultrafiltration membrane and electro-catalysis method

Abstract

The invention discloses an oil-containing wastewater treatment process combining an ultrafiltration membrane and an electro-catalysis method. The process comprises the following steps: (1) pretreatingemulsion-containing wastewater; (2) inputting the wastewater into an ultrafiltration membrane system, performing cross-flow filtration, and concentrating grease components, suspended solid and othermacromolecular substances in the wastewater so as to reduce the volume of the waste liquid greatly; (3) inputting the effluent of the ultrafiltration membrane system into an electro-catalysis reactiontank, adjusting the pH value, adding activated carbon, and carrying out an electro-catalytic oxidation reaction; (4) dividing the effluent of the electro-catalysis reaction tank into two parts, returning the supernatant to a circulating liquid storage tank, returning the bottom turbid liquid to the ultrafiltration membrane system, and performing continuous circulation of the wastewater in the ultrafiltration membrane system, the electro-catalysis reaction tank and the circulating liquid storage tank; and (5) performing circulation of the above process for a certain period of time, inputting the effluent of the circulating liquid storage tank into a flocculation sedimentation tank, adjusting the pH value, adding chemicals, completing flocculation and sedimentation, and inputting the effluent to a subsequent treatment system.

Description

Technical field [0001] The invention relates to an oily wastewater treatment process combining an ultrafiltration membrane and an electrocatalytic method. Background technique [0002] A large amount of oily emulsion wastewater is produced in steel, machinery and other industries, and its composition is relatively complex, mainly containing mineral oil, fatty acid surfactants, suspended impurities, emulsifiers, and lubricants. Oily wastewater has the characteristics of easy emulsification, difficult degradation, and poor biodegradability, and the traditional treatment technology currently used is not easy to meet the standard. For example, oil separation method, flotation method and centrifugal separation method are basically based on the removal of free oil and suspended solids in wastewater, and the removal effect of wastewater containing emulsified oil and cutting oil is not ideal. [0003] The traditional electrocatalytic method directly degrades organic matter through anode r...

AI Technical Summary

Problems solved by technology

Oily wastewater has the characteristics of easy emulsification, refractory degradation, and poor biodegradability. The traditional treatment process currently used is not easy to meet the standard.

Such as oil separation method, flotation method and centrifugal separation method, etc., basically target free oil and suspended solids in wastewater, and the removal effect on wastewater containing emulsified oil and cutting oil is not ideal

[0003] The traditional electrocatalytic method directly degrades organic matter through anodic reaction or generates oxidants such as hydroxyl radicals, OH, and 02 to degrade organic matter. The strong oxidant produced at the anode oxidizes organic pollutants and microbial organisms in wastewater, which can basically meet the process requirements. Some emulsified oil and cutting oil wastewater are not treated well, which causes a great load on the subsequent treatment

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