engleski

Electrochemical processes in oily wastewater treatment

Today's trends are focused on investigating the efficiency of oily wastewater treatment with electrochemical processes due to the fact that they do not depend on temperature changes of the influent, do not require the addition of chemicals and do not require pH adjustment during treatment. Among different electrochemical processes, state- of-the-art confirms the high efficiency of electrocoagulation (EC) process. The use of Fe and Al electrodes achieves a relatively high efficiency of oil and grease removal, as well as COD removal. However, there is a need to investigate the efficiency of hybrid processes that combine different electrochemical processes, such as advanced oxidation processes (AOP) and EC. In this paper, oily wastewater from oil and grease separators was used, and the treatment was performed on a pilot plant using a combination of electrochemical AOP and EC processes. Two tests were performed, the first analysing the treatment efficiency of oily wastewater, which was completely mixed without pretreatment, and the second analysing the effect of primary sedimentation (1st stage of treatment) on the overall treatment efficiency. In the treatment of oily wastewater by applied electrochemical processes without primary sedimentation, the removal efficiency of total oil and grease was about 70%, and COD about 50%. With additional primary sedimentation prior to AOP-EC process, the total removal efficiency of total oil and grease was about 90%, and COD about 70%. The results indicate the high efficiency of oily wastewater treatment by a hybrid AOP and EC process, and the application of primary sedimentation has been proven with higher overall treatment efficiency.

Electrocoagulation, AOP, oily wastewater

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