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On the kinetics of organic pollutant degradation with Co2+/peroxymonosulfate process: When ammonium meets chloride
Ying Huang1, Fei Yang1, Luoyan Ai1
1State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
Abstract:
A large amount of chloride and ammonium ions were produced and released from industrial processes with non-biodegradable organic pollutants to affect efficiencies of advanced oxidation processes (AOPs). Here, the influences of chloride and ammonium ions on Co/peroxymonosulfate (Co/PMS) reaction system, a widely used AOPs to produce sulfate radicals, were investigated by examining the degradation efficiency of an azo dye (Acid Orange 7, AO7). The experimental results showed that a significant decrease in the degradation rate of AO7 was observed in the presence of NH4+, while a dual effect of chloride on AO7 bleaching appeared. The presence of NH4Cl was unfavorable for AO7 degradation at low concentration (<20 mM), whereas further addition of NH4Cl (>20 mM) apparently accelerated AO7 discoloration rate. The apparent effects of the two co-existing inorganic ions were determined by roles of the dominating ions at varied molar ratio of [NH4+]/[Cl-]. The present study may have technical implications for the treatment of industrial wastewater containing diverse ions in practice.
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