Degradation of recalcitrant organic matter in SAARB leachate by a combined process of coagulation and catalytic ozonatio
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RESEARCH ARTICLE
Degradation of recalcitrant organic matter in SAARB leachate by a combined process of coagulation and catalytic ozonation Yan Xiang 1 & Yaping Chen 2 & Siqiang Luo 3 & Junliang Zou 3 & Aiping Zhang 4 Received: 12 October 2019 / Accepted: 2 March 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A combined coagulation and γ-Al2O3 catalytic ozonation process was used to treat semi-aerobic aged refuse biofilter (SAARB) effluent from treating mature landfill leachate. First, the coagulant providing the best pretreatment performance was selected. Then, the coagulated SAARB leachate was further treated in an optimized γ-Al2O3-catalyzed ozonation process. Characteristics of the γ-Al2O3-catalyzed ozonation process were determined, and a reaction mechanism was proposed. FeCl3 provided the best treatment efficiency (chemical oxygen demand (COD) removal of 65.8%, absorbance at 254 nm (UV254) removal of 68.55%, and color number (CN) removal of 79.4%). Under optimized O3 dosage (18.92 mg/min) and γ-Al2O3 dosage (10 g/L), efficiencies of removing COD, UV254, and CN were 54.3%, 82.9%, and 95.9%, respectively, at 30 min. In addition, spectral analysis indicated that fulvic-like substances in ultraviolet and visible regions were effectively degraded in the γ-Al2O3-O3 process and some smaller organic products were produced. Characterization of γ-Al2O3 showed that γ-Al2O3 was relative stable; its morphology and constituent elements did not change much after reaction. In addition, ozonation capacity was enhanced by heterogeneous catalytic effects of γ-Al2O3. The combined coagulation and γ-Al2O3 catalytic ozonation process was proven to be an efficient treatment method for removing bio-refractory organic matter contained in SAARB leachate. Keywords Coagulation . Ozonation . Semi-aerobic aged refuse biofilter . Heterogeneous catalytic effect
Introduction Worldwide, a steady increase in the production of municipal solid waste (MSW) has been caused by the improved living standards and development of the economy. According to the China Statistical Year Book of 2018 (Statics 2018), more than 200 billion metric tons of MSW were produced in China, and Responsible editor: VÃtor Pais Vilar * Yaping Chen [email protected] * Aiping Zhang [email protected] 1
Chengdu Textile College, Chengdu 611731, China
2
Sichuan Academy of Eco-Environmental Science, Chengdu 610041, China
3
Sichuan Province Environmental Protection Technology Engineering, Chengdu 610041, China
4
College of Chemistry and Material Science, Sichuan Normal University, Chengdu 610068, China
the main treatment approaches for managing this waste were landfilling and incineration. Leachate is produced during MSW treatment by both of these processes. Because leachate contains high concentrations of recalcitrant organics and a variety of inorganic salts, how to properly treat landfill leachate is an important concern in the fields of solid waste management and wastewater treatment (Chen et al. 2019b). At present, the commonly adopted
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