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Application of TiO2-organobentonite modified by cetyltrimethylammonium chloride photocatalyst and polyaluminum chloride coagulant for pretreatment of aging landfill leachate

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Abstract

This study investigated the treatment performance for aging leachate containing refractory organic pollutants by TiO2-organobentonite photocatalyst combined with polyaluminum chloride (PAC) coagulant. TiO2 was immobilized on organobentonite granules as a supporter modified by cetyltrimethylammonium chloride (CTAC). The prepared catalysts were characterized by ESEM, FTIR, and XRD analysis, which showed that TiO2-organobentonite catalyst had uniform coating of TiO2 on support. Chemical oxygen demand (COD) and NH3-N removal rates by combination of TiO2-CTAC2.0 photocatalysis and PAC coagulation were evaluated, optimized, and compared to that by either treatment alone, with respect to TiO2-CTAC2.0 dose, photocatalytic contact time, pH, and PAC dose. Furthermore, higher removal rates (COD 80 %; NH3-N 46 %) were achieved by response surface methodology (RSM) when TiO2-CTAC2.0 photocatalysis was followed by PAC coagulation at optimized conditions. The optimized experimental conditions were TiO2-CTAC2.0 dosage of 5.09 g/L, at pH 5.53, photocatalytic contact time for 180 min, and PAC dosage of 1062 mg/L.

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Acknowledgments

This study was sponsored by the National Natural Science Foundation of China (Grant Nos. 51378189, 51578223, and 51521006).

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Authors and Affiliations

  1. College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China

    Yi-Jie Zhang, Zhao-Hui Yang, Pei-Pei Song, Hai-Yin Xu, Rui Xu, Jing Huang, Juan Li & Yan Zhou

  2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China

    Yi-Jie Zhang, Zhao-Hui Yang, Pei-Pei Song, Hai-Yin Xu, Rui Xu, Jing Huang, Juan Li & Yan Zhou

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  1. Yi-Jie Zhang
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  2. Zhao-Hui Yang
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  3. Pei-Pei Song
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  5. Rui Xu
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  8. Yan Zhou
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Correspondence to Zhao-Hui Yang.

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Responsible editor: Suresh Pillai

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Zhang, YJ., Yang, ZH., Song, PP. et al. Application of TiO2-organobentonite modified by cetyltrimethylammonium chloride photocatalyst and polyaluminum chloride coagulant for pretreatment of aging landfill leachate. Environ Sci Pollut Res 23, 18552–18563 (2016). https://doi.org/10.1007/s11356-016-7031-4

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