Application of TiO2-organobentonite modified by cetyltrimethylammonium chloride photocatalyst and polyaluminum chloride coagulant for pretreatment of aging landfill leachate.
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.
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Yi-Jie
YJ
Zhang
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China. yzh@hnu.edu.cn.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China. yzh@hnu.edu.cn.
Zhao-Hui
ZH
Yang
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Pei-Pei
PP
Song
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Hai-Yin
HY
Xu
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Rui
R
Xu
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Jing
J
Huang
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Juan
J
Li
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Yan
Y
Zhou
D000536:Aluminum Hydroxide / Q000032:analysis; D001546:Bentonite / Q000737:chemistry; D057919:Biological Oxygen Demand Analysis; D008725:Bis-Trimethylammonium Compounds / Q000032:analysis / Q000737:chemistry*; D002384:Catalysis; D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D003029:Coagulants; D012037:Refuse Disposal / Q000379:methods*; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
D008725:Bis-Trimethylammonium Compounds; D002593:Cetrimonium Compounds; D003029:Coagulants; D014874:Water Pollutants, Chemical; C525618:cethyltrimethylammonium chloride; D001546:Bentonite; C016213:aluminum oxychloride; C009495:titanium dioxide; D000536:Aluminum Hydroxide; D014025:Titanium; D000077286:Cetrimonium
Aging leachate; COD; Coagulation; NH3-N; PAC; Photocatalysis; TiO2-CTAC2.0