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Efficient treatment of alizarin yellow R contained wastewater in an electrostimulated anaerobic-oxic integrated system
- Li, Zhi-Ling, Sun, Kai, Chen, Fan, Lin, Xiao-Qiu, Huang, Cong, Yao, Zheng, Chen, Dan, Xia, Ting, Xiao, Zhi-Xing, Wang, Ai-Jie
- Environmental research 2020 v.185 pp. 109403
- Comamonas, Desulfovibrio, Propionispira, Rhodocyclus, alizarin, amination, ammonia, ammonification, biofilm, chemical oxygen demand, corrosion, decolorization, denitrification, electrons, fermentation, heat treatment, metabolites, mineralization, nitrates, nitrification, nitrogen, oxidation, stainless steel, toxicity, wastewater
- An electrostimulated anaerobic-oxic integrated system was constructed for treating alizarin yellow R (AYR) containing wastewater. In electro-stimulated anaerobic unit, AYR decolorization efficiency improved from 51.2% to 96.6%. Two amination metabolites, p-phenylenediamine and 5-aminosalicylic acid, went through oxidation, ammonification and mineralization in oxic unit. Electro-stimulation promoted denitrification and COD removal efficiencies by 15.5% and 8.6%, respectively. A 20% improved nitrification efficiency was observed in oxic unit, due to elimination of AYR toxicity inhibition. No corrosion of heat-treated stainless steel occurred during the 60 days of continuous operation. Electrons sunk in denitrification and decolorization accounted for 34.4–36.8% of those released from COD removal, and 7.3% increase of removed nitrogen in nitrogenous compounds (AYR, nitrate and ammonia) was found. Electro-stimulated anaerobic unit predominated with fermentation and denitrification genera (Propionispira, Rhodocyclus, etc.) and aboundance of electro-active decolorization genus (Desulfovibrio, etc.) increased. Ammonia-oxidizing genus, Comamonas, was the most abundant in aerobic unit. Compared to the suspension, the electrostimulation could increased the abundance of electro-active genera in cathodic biofilm. This study revealed the feasibility of applying electro-stimulation and the conversion laws of nitrogenous organics in secondary bio-treatment system for treating toxic nitrogenous organics-contained wastewater.