Advanced Oxidation Pretreatment for Biological Treatment of Reclaimer Wastewater Containing High Concentration N-methyldiethanolamine

Abstract

A wastewater treatment configuration consisting of advanced oxidation pretreatment and biological wastewater treatment process (BWTP) was investigated to treat a reclaimer wastewater generated in a steel-making industry, which contained high concentration MDEA (N-methyldiethanolamine) of up to 20,548 mg/L and other pollutants such as formate, phenol, and thiocyanate. The Fenton, ozone, and peroxone methods were tested as candidates, and the peroxone method was chosen because it could selectively decompose MDEA resulting in the final MDEA and chemical oxygen demand (COD) removal efficiencies of 92.87% and 27.16%, respectively. Through the respirometer tests using the sludge of the BWTP, it was identified that the microbial toxicity of the peroxone-pretreated wastewater was negligible and the short-term biochemical oxygen demand (BOD) to COD ratio, indicating that the biodegradability of wastewater significantly increased from 0.103 to 0.147 by the peroxone pretreatment. Analysis of the oxygen uptake rate profiles also revealed that the microbial degradation rate of the pollutants present in the reclaimer wastewater was in the order of phenol > formate > thiocyanate > MDEA, which could be changed depending on the microbial community structure of the BWTP.

Three novel coordination polymers as bifunctional materials for the photocatalytic degradation of dyes and the oxygen evolution reaction in alkaline solutions

“…5 Therefore, industrial wastewater must undergo strict degradation treatment before discharge. At present, water pollution treatment methods include biological treatment, 6 physical adsorption, 7,8 chemical oxidation, 9 and photocatalytic degradation. 10,11 Among them, photocatalysis stands out among many methods due to its advantages of low cost, high degradation rate, environmental friendliness, and no formation of secondary pollutants.…”

Special Issue on Wastewater Treatment Technologies

“…A total of nine papers (seven research papers and two review papers) in various fields of wastewater treatment technology including advanced oxidation, microbial fuel cell, ananmmox, and bioflocculant are presented in this Special Issue. Oh et al [1] reported that high-concentration N-methyldiethanolamine wastewater was successfully treated using a wastewater treatment configuration consisting of advanced oxidation and biological wastewater treatment technology. Kim et al [2] reported that the augmentation of calcium and magnesium contributes to alleviating the salinity stress on anammox granules, and is expected to allow for the application of the anammox process to saline wastewater treatment.…”