Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

Lei Chen, Yanhua Xu and Yongjun Sun
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Lei Chen: School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Yanhua Xu: School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Yongjun Sun: College of Urban Construction, Nanjing Tech University, Nanjing 211800, China

IJERPH, 2019, vol. 16, issue 10, 1-18

Abstract: In this study, coagulation, ozone (O 3 ) catalytic oxidation, and their combined process were used to pretreat actual coking wastewater. The effects on the removal of chemical oxygen demand (COD) and phenol in coking wastewater were investigated. Results showed that the optimum reaction conditions were an O 3 mass flow rate of 4.1 mg min −1 , a reaction temperature of 35 °C, a catalyst dosage ratio of 5:1, and a O 3 dosage of 500 mg·L −1 . The phenol removal ratio was 36.8% for the coagulation and sedimentation of coking wastewater under optimal conditions of 25 °C of reaction temperature, 7.5 reaction pH, 150 reaction gradient (G) value, and 500 mg·L −1 coagulant dosage. The removal ratios of COD and phenol reached 24.06% and 2.18%, respectively. After the O 3 -catalyzed oxidation treatment, the phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds were degraded to varying degrees. Coagulation and O 3 catalytic oxidation contributed to the removal of phenol and COD. The optimum reaction conditions for the combined process were as follows: O 3 dosage of 500 mg·L −1 , O 3 mass flow of 4.1 mg·min −1 , catalyst dosage ratio of 5:1, and reaction temperature of 35 °C. The removal ratios of phenol and COD reached 47.3% and 30.7%, respectively.

Keywords: coking wastewater; ozone catalysis; coagulation; combined process (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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