title: Synthesis of nano-zeolite from coal fly ash and its potential for nutrient sequestration from anaerobically digested swine wastewater.
abstract: The treatment of anaerobically digested swine wastewater (ADSW) is problematic due to its high nutrient concentration. This study investigated the simultaneous sequestration of ammonium (N) and phosphate (P) from ADSW using nano-zeolites synthesized from fly ash (ZFA). The nanometer-scale crystalline structures plentiful of zeolite-NaP1 coating on ZFA particle increased the levels of specific surface area and cation exchange capacity at times of 40 and 104, compared to raw fly ash. Kinetic N and P sorption experiments with ZFA were well described by both the Langmuir and Freundlich models, suggesting the co-existence of homogeneous and heterogeneous sorption mechanisms. N and P removal efficiencies ranged from 41% to 95% and 75% to 98%, respectively, across a range of ZFA doses (from 0.25 to 8g/100ml). Collectively, application of the laboratory-synthesized ZFA can alleviate the nutrient loads in ADSW and therefore modify the ratio of N:P in wastewater beneficial for subsequent biological treatment.
authors.affiliation: Institute of Environmental Science, Center of Water Ecosystem and Watershed Management, ZheJiang University, YuangHangTang Avenue 688, HangZhou, ZheJiang Province 310058, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Chen
authors.forename: Khunjar
authors.initials: K
authors.lastname: Wendell
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.forename: Jiangli
authors.initials: J
authors.lastname: Li
authors.forename: Xianxian
authors.initials: X
authors.lastname: Yu
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D000693:Anaerobiosis; D000818:Animals; D003031:Coal; D060729:Coal Ash; D049329:Nanostructures; D013552:Swine; D017641:Zeolites / Q000138:chemical synthesis*
chemical_list: D003031:Coal; D060729:Coal Ash; D017641:Zeolites