Pulsed corona discharge for improving treatability of coking wastewater

Journal of Environmental Sciences (China)
Ming LiuChao-Hai Wei

Abstract

Coking wastewater (CW) contains toxic and macromolecular substances that inhibit biological treatment. The refractory compounds remaining in biologically treated coking wastewater (BTCW) provide chemical oxygen demand (COD) and color levels that make it unacceptable for reuse or disposal. Gas-phase pulsed corona discharge (PCD) utilizing mostly hydroxyl radicals and ozone as oxidants was applied to both raw coking wastewater (RCW) and BTCW wastewater as a supplemental treatment. The energy efficiency of COD, phenol, thiocyanate and cyanide degradation by PCD was the subject of the research. The cost-effective removal of intermediate oxidation products with addition of lime was also studied. The energy efficiency of oxidation was inversely proportional to the pulse repetition frequency: lower frequency allows more effective utilization of ozone at longer treatment times. Oxidative treatment of RCW showed the removal of phenol and thiocyanate at 800 pulses per second from 611 to 227mg/L and from 348 to 86mg/L, respectively, at 42kWh/m3delivered energy, with substantial improvement in the BOD5/COD ratio (from 0.14 to 0.43). The COD and color of BTCW were removed by 30% and 93%, respectively, at 20kWh/m3, showing energy efficiency ...Continue Reading

Citations

May 10, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Narasamma Nippatlapalli, Ligy Philip
Oct 27, 2020·Environmental Science and Pollution Research International·Jiawei FanYongjun Sun
Oct 8, 2021·Environmental Science and Pollution Research International·Prateek GururaniBeena Pathak

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