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

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

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

2016

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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