Optimized Pretreatment of Non-Thermal Plasma for Advanced Sewage Oxidation

Hee-Jun Kim, Chan-Hee Won and Hyun-Woo Kim
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Hee-Jun Kim: Soil Environment Research Center, Department of Environmental Engineering, Division of Civil, Environmental, Mineral Resource and Energy Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Korea
Chan-Hee Won: Soil Environment Research Center, Department of Environmental Engineering, Division of Civil, Environmental, Mineral Resource and Energy Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Korea
Hyun-Woo Kim: Soil Environment Research Center, Department of Environmental Engineering, Division of Civil, Environmental, Mineral Resource and Energy Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Korea

IJERPH, 2020, vol. 17, issue 20, 1-13

Abstract: This study investigates how the non-thermal plasma (NTP) process leads to advanced oxidation of sewage using response surface methodology. For environmentally viable and efficient operation of the NTP process, temperature and contact time were selected as two important independent variables. Their impacts on the performance were tested following an experimental design to figure out optimal operating conditions. Based on obtained treatment efficiency, statistically optimized conditions were derived by using an approach adapting the central composite design. Results show that coupling 40 °C of temperature and 4 h of contact time demonstrate optimal performance for total chemical oxygen demand (TCOD, 59%) and total suspended solids (85%), respectively. This implies that NTP may present efficient particulate destruction leading to organic solids dissolution. Statistical analysis reveals that the contact time shows more significant dependency than the temperature on the advanced oxidation of TCOD, possibly due to dissolved organic material. For total nitrogen removal, on the contrary, the optimal efficiency was strongly related to the higher temperature (~68 °C). This work provides an inroad to considering how NTP can optimally contribute to better oxidation of multiple pollutants.

Keywords: non-thermal plasma; advanced oxidation process; statistical optimization; temperature; contact time; pollutant removal (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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