title: Nutrient sequestration from wastewater by using zeolite Na-P1 synthesized from coal fly ash.
abstract: The objective of this study is to investigate the cation exchange property of the product zeolite Na-P1 (Z-P1) synthesized from coal fly ash (FA) by the alkali hydrothermal reaction, and to evaluate the water purification ability for the simultaneous removal of ammonium and phosphate. High-purity Z-P1 was obtained by optimizing the reaction conditions of aging time and crystallization temperature, and using FA particles of uniform particle size. Kinetic ammonium sorption experiments with Z-P1 were well described by both the Langmuir and Freundlich models, and the maximum adsorption capacity of the Z-P1 was 23.15 mg/g. Moreover, in order to determine the effect of magnesium intervention on the ammonium and phosphate removal from simulated swine wastewater, two forms of magnesium were studied, that is Mg-saturated Z-P1 and direct use of Mg2+source with Z-P1, as compared with the control (sole Z-P1). Results showed that Mg2+addition could improve phosphate removal efficiency significantly by forming struvite. Furthermore, dosing Z-P1 with dissolved Mg2+was better than Mg-saturated Z-P1 in terms of ammonium and phosphate removal efficiencies, and the preparation cost. When dosing 20 g/L Z-P1 with 4 mM Mg2+, ammonium and phosphate removal efficiencies reached 65.2% and 92.3% after 30 min.
authors.affiliation: a School of Environment and Architecture , University of Shanghai for Science and Technology , Shanghai , People's Republic of China.
authors.forename: Hongfu
authors.initials: H
authors.lastname: He
authors.affiliation: a School of Environment and Architecture , University of Shanghai for Science and Technology , Shanghai , People's Republic of China.
authors.forename: Suyun
authors.initials: S
authors.lastname: Xu
authors.affiliation: a School of Environment and Architecture , University of Shanghai for Science and Technology , Shanghai , People's Republic of China.
authors.forename: Runqi
authors.initials: R
authors.lastname: Han
authors.affiliation: a School of Environment and Architecture , University of Shanghai for Science and Technology , Shanghai , People's Republic of China.
authors.forename: Qiuchen
authors.initials: Q
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D000383:Agriculture; D000641:Ammonia / Q000737:chemistry; D000818:Animals; D003031:Coal; D060729:Coal Ash / Q000737:chemistry*; D007700:Kinetics; D008274:Magnesium / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D013552:Swine; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000641:Ammonia; D003031:Coal; D060729:Coal Ash; D008274:Magnesium; D010710:Phosphates; D012964:Sodium; D062065:Wastewater; D014874:Water Pollutants, Chemical; D017641:Zeolites
keywords: Ammonium; Mg saturated zeolite; coal fly ash; struvite; zeolite Na-P1