Enhanced removal performance by the core-shell zeolites/MgFe-layered double hydroxides (LDHs) for municipal wastewater treatment

• Published in: Environmental science and pollution research international 2016-04, Vol.23 (7), p.6749-6757
• Main Authors: Guo, Lu, Zhang, Xiangling, Chen, Qiaozhen, Ruan, Congying, Leng, Yujie
• Format: Article
• Language: English
• Subjects: Adsorption; Ammonia; Ammonia - analysis; ammonium nitrogen; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; chemical oxygen demand; coatings; coprecipitation; Earth and Environmental Science; Economic analysis; Ecotoxicology; energy; Energy consumption; energy-dispersive X-ray analysis; Environment; Environmental Chemistry; Environmental Health; Environmental science; Experiments; Filtration - methods; Hydrocarbons - analysis; Hydroxides; Hydroxides - chemistry; Iron - chemistry; Magnesium - chemistry; Municipal wastewater; particle size; phosphates; phosphorus; Phosphorus - analysis; Phosphorus removal; Porous materials; Research Article; scanning electron microscopes; scanning electron microscopy; spectrometers; Studies; Waste Water - chemistry; Waste Water Technology; Wastewater treatment; Water Management; Water Pollutants, Chemical - analysis; Water Pollution Control; Water Purification - methods; Water treatment; Zeolites; Zeolites - chemistry
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-015-5910-8

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.