Abstract: In response to the safety and environmental issues related to the storage and treatment of special high concentration wastewater in a petrochemical enterprise, this paper conducted experimental research on pretreatment mainly based on electrochemical oxidation. The process parameters of electrochemical oxidation were determined through small-scale experiments. The results of the side line test show that under various water ratios, the pretreatment technology mainly based on electrochemical oxidation can achieve ammonia nitrogen removal rate greater than 93% and chemical oxygen demand(COD) removal rate greater than 45%. After analyzing and solving the problem of engineering scaling up, the industrial device operated stably for 7 months.The results showed that under stable incoming water conditions, the mass concentration of ammonia nitrogen in the effluent was less than 35 mg/L, and the COD was less than 1000 mg/L, meeting the requirements for pre-treatment effluent.This study solves the problem of storage and treatment of such special wastewater.

Key words: special high-concentration wastewater, electrochemical oxidation, pretreatment technology, COD, ammonia nitrogen