Study on degradation process of organic matter in organic amine wastewater from natural gas purification plant

Author of the article:LI Li1, YAN Zihan2, JIN Yan3, XIAO Hua2

Author's Workplace：1. National Engineering Research Center for Integrated Utilization of Salt Lake Resources, East China University of Science and Technology, Shanghai,200237, China; 2. CPECC Southwest Company, Chengdu, Sichuan,610041, China; 3. Suzhou Synovo Green Tech Co., Ltd., Changshu, Jiangsu,215513, China

Key Words：Electrocatalytic oxidation; Biochemical oxidation; Biodegradability; Standards of the management

Abstract：The resin regeneration waste liquid produced in the tail gas desulfurization process of natural gas purification plants has the characteristics of high organic content and poor biodegradability. In this paper, the integrated process of “electrocatalytic oxidation and biochemical oxidation” was investigated. The optimal process parameters of the electrocatalytic oxidation system were determined as that the reaction time was 2 h, pH was 3~5, the dosage of 10% hydrogen peroxide 8.75 mL/L, current density 10 mA/cm2. Under the optimal operating conditions, the COD(Chemical Oxygen Demand) removal rate can reach 53.2%, and the BOD(Biochemical Oxygen Demand)/COD ratio can be increased from 0.05 to 0.21. InAfter the biochemical oxidation process, the COD removal rate can be kept at 50%, and the effluent concentration of chemical oxygen demand and total nitrogen can be reduced to within 200 mg/L and 50 mg/L respectively, which meets the management standards. The study can provide reference for the treatment of organic amine wastewater in natural gas purification plants.