Application of TiO2-organobentonite modified by cetyltrimethylammonium chloride photocatalyst and polyaluminum chloride coagulant for pretreatment of aging landfill leachate
2016
Zhang, Yi-Jie | Yang, Zhao-Hui | Song, Pei-Pei | Xu, Hai-Yin | Xu, Rui | Huang, Jing | Li, Juan | Zhou, Yan
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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