Formation of Struvite Crystals in a Simulated Food Waste Aerobic Composting Process  

作　　者：DU Xian-yuan LIU Jian-lin HUANG Guo-he LI YU 

机构地区：[1]Energy and Environmental Research Centre, North China Electric Power University, Beo＇ing 102206, P. R. China [2]College of Environment and Resources, Jilin University, Changchun 130012, P. R. China [3]Environmental Systems Engineering Program, Faculty of Engineering, University of Regina, Regina, SK S4S OA2, Canada

出　　处：《Chemical Research in Chinese Universities》2010年第2期210-216,共7页高等学校化学研究（英文版）

基　　金：Supported by the Scholarship from China Scholarship Council(No.22822053)

摘　　要：Bench-scale treatments with three mixtures of Mg and P salts, including K3PO4＋MgSO4, K2HPO4＋MgSO4, and KH2PO4＋MgSO4 as additives in a simulated food waste aerobic composting process, were conducted to test the magnesium ammonium phosphate（MAP） formation, and the compost products were analyzed by X-ray diffraction（XRD）, Scanning electron microscopy（SEM）, and Energy dispersive X-ray spectroscopy（EDS） analyses. The comparison results between XRD, SEM, and EDS analyses of MAPs in the dried compost and synthesized MAPs confirm the formation of MAP crystals in the simulated food waste aerobic composting process. The analysis of the compost also indicates that the addition of all the three mixtures of Mg and P salts in the aerobic composting process can increase nitrogen conservation and decrease nitrogen loss because of the formation of MAPs. The mechanism of MAP formation was verified as the reaction of ammonium（NH4＋） with magnesium（Mg^2＋） and phosphate[HnPO4^（3-n） , n=0, 1, and 2）.Bench-scale treatments with three mixtures of Mg and P salts, including K3PO4＋MgSO4, K2HPO4＋MgSO4, and KH2PO4＋MgSO4 as additives in a simulated food waste aerobic composting process, were conducted to test the magnesium ammonium phosphate（MAP） formation, and the compost products were analyzed by X-ray diffraction（XRD）, Scanning electron microscopy（SEM）, and Energy dispersive X-ray spectroscopy（EDS） analyses. The comparison results between XRD, SEM, and EDS analyses of MAPs in the dried compost and synthesized MAPs confirm the formation of MAP crystals in the simulated food waste aerobic composting process. The analysis of the compost also indicates that the addition of all the three mixtures of Mg and P salts in the aerobic composting process can increase nitrogen conservation and decrease nitrogen loss because of the formation of MAPs. The mechanism of MAP formation was verified as the reaction of ammonium（NH4＋） with magnesium（Mg^2＋） and phosphate[HnPO4^（3-n） , n=0, 1, and 2）.

关 键 词：PHOSPHATE Magnesium sulphate Magnesium ammonium phosphate Food waste treatment Aerobic composting 

分 类 号：TQ132.2[化学工程—无机化工] TS202[轻工技术与工程—食品科学]