Main content area

Enhanced removal of ethanolamine from secondary system of nuclear power plant wastewater by novel hybrid nano zero-valent iron and pressurized ozone initiated oxidation process

Lee, Son Dong, Mallampati, Srinivasa Reddy, Lee, Byoung Ho
Environmental science and pollution research international 2017 v.24 no.21 pp. 17769-17778
biodegradability, calcium, calcium oxide, chemical oxygen demand, cooling systems, corrosion, ethanolamine, hydrogen peroxide, iron, nuclear power, oxidation, oxygen, ozone, pH, power plants, wastewater
Monoethanolamine (shortly ethanolamine (ETA)), usually used as a corrosion inhibitor, is a contaminant of wastewater from the secondary cooling system of nuclear power plants (NPPs) and is not readily biodegradable. We conducted various experiments, including treatments with nano zero-valent iron (nZVI), nano-iron/calcium, and calcium oxide (nFe/Ca/CaO) with ozone (O₃) or hydrogen peroxide (H₂O₂) to reduce the concentration of ETA and to decrease the chemical demand of oxygen (COD) of these wastewaters. During this study, wastewater with ETA concentration of 7465 mg L⁻¹ and COD of 6920 mg L⁻¹ was used. As a result, the ETA concentration was reduced to 5 mg L⁻¹ (a decrease of almost 100%) and COD was reduced to 2260 mg L⁻¹, a reduction of 67%, using doses of 26.8 mM of nZVI and 1.5 mM of H₂O₂ at pH 3 for 3 h. Further treatment for 48 h allowed a decrease of COD by almost 97%. Some mechanistic considerations are proposed in order to explain the degradation pathway. The developed hybrid nano zero-valent iron-initiated oxidation process with H₂O₂ is promising in the treatment of ETA-contaminated wastewaters.