title: Enhanced removal performance by the core-shell zeolites/MgFe-layered double hydroxides (LDHs) for municipal wastewater treatment.
abstract: The application of powdered layer double hydroxides (LDHs) in constructed rapid infiltration system (CRIS) appears to be an appreciable problem still unsolved due to the small particle size and the low density. Therefore, the core-shell zeolites/MgFe-LDHs composites were prepared via using co-precipitation method in present study. To investigate the practical applicability, a detailed organics, ammonia, and total phosphorus removal study were carried out in columns to treat the municipal wastewater. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) results confirmed the successful synthesis of core-shell zeolites/MgFe-LDHs through coating on the surface of zeolites. Accordingly, the zeolites/MgFe-LDHs largely reduced the COD by 81.14 %, NH4 (+)-N by 81.50%, and TP by 83.29%. Phosphate adsorption study revealed that the equilibrium adsorption data were better fitted by Langmuir isothermal model, with the maximum adsorption capacity of 79.3651 mg/kg for zeolites/MgFe-LDHs and 38.4615 mg/kg for the natural zeolites. In addition, economic analysis indicated that the reagent cost of synthesis of zeolites/MgFe-LDHs was economical. Herein, the zeolites/MgFe-LDHs solved the natural zeolites problem for poor P removal and the application of powdered LDHs in the solid/liquid separation process, suggesting that it was applicable as potential substrates for the removal of organics, ammonia, and total phosphorus in CRIS.
authors.affiliation: School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Guo
authors.affiliation: School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China. zxlcl@126.com.
authors.forename: Xiangling
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China.
authors.forename: Qiaozhen
authors.initials: Q
authors.lastname: Chen
authors.affiliation: School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China.
authors.forename: Congying
authors.initials: C
authors.lastname: Ruan
authors.affiliation: School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Leng
mesh_terms: D000327:Adsorption; D000641:Ammonia / Q000032:analysis; D005374:Filtration / Q000379:methods; D006838:Hydrocarbons / Q000032:analysis; D006878:Hydroxides / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000641:Ammonia; D006838:Hydrocarbons; D006878:Hydroxides; D007501:Iron; D008274:Magnesium; D010758:Phosphorus; D062065:Wastewater; D014874:Water Pollutants, Chemical; D017641:Zeolites
keywords: Constructed rapid infiltration system; Layered double hydroxides; Removal performance; Zeolites substrate; Zeolites/MgFe-LDHs