A green and efficient oil field sewage treatment technology to reach the discharge standard

What is it about?

A green and efficient three-dimensional electrochemical reactor is applied in oily sewage treatment, under these experimental conditions: the electrolysis current of 6A, surface/volume ratio of 6/25(cm2∙L-1) and the reaction time of 50min, the COD of treated sewage is no more than 50mg∙L-1. In the study, the residual active oxides such as O3, H2O2, ∙OH and chlorine can be detected effectively in the electrochemical reaction system, and the COD removal mechanism is co-oxidation of active oxides; The removal reaction of COD conforms to apparent second-order reaction kinetic model, and the apparent reaction rate constant is 3.58×10-4(L∙min-1∙mg-1∙m-2). The small k value is the internal cause of the slow COD removal rate.

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Why is it important?

The rate model of COD removal in oilfield sewage is established. What is important is that the increase of the specific surface area of the three-dimensional electrode fillers can effectively improve the reaction rate and facilitate the rapid removal of COD. When the reaction proceeds to the late stage, the reaction rate changes little with the decrease of COD, and the effect of increasing the electrochemical reaction time on COD removal rate is not obvious.

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