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Advanced treatment of biotreated coking wastewater with peroxymonosulfate oxidation catalyzed by granular activated carbon
Author(s) -
Song Xiulan,
Liu Meiqin
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5560
Subject(s) - chemistry , wastewater , adsorption , catalysis , total organic carbon , decomposition , degradation (telecommunications) , sewage treatment , activated carbon , environmental chemistry , nuclear chemistry , waste management , organic chemistry , telecommunications , computer science , engineering
BACKGROUND After biological treatment, coking wastewater contains high concentrations of toxic organic contaminants and thus requires further treatment. RESULTS Advanced treatment of biotreated coking wastewater (BTCW) with peroxymonosulfate (PMS) oxidation catalyzed by granular activated carbon (GAC) at ambient temperature (25 °C) was comprehensively investigated. The GAC/PMS system exhibited higher efficiency for total organic carbon (TOC) removal from BTCW than did the PMS‐only and GAC‐only systems. Up to 75.7% of TOC was removed over a 5 h period with 2 g L ‐1 of KHSO 5 and 10 g L ‐1 of GAC at an initial pH of approximately 5. The TOC removal efficiency increased with PMS concentration and GAC dosage; however, the superfluous PMS was not conducive to organic degradation. The PMS decomposition followed a first‐order kinetics behavior. The GAC/PMS system's capacity for TOC removal gradually weakened with increase in the number of times the GAC was reused. Almost half of the removal rate was retained after four uses of GAC. The excitation–emission matrix fluorescence demonstrated that humic‐acid‐like substances are effectively adsorbed and preferentially decomposed in wastewater. CONCLUSION The study suggests that it is feasible for advanced treatment of BTCW with PMS oxidation catalyzed by GAC, achieving high efficiency for TOC removal. © 2017 Society of Chemical Industry