Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis
作者机构：Institute of Waste Treatment and ReclamationCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological SecurityShanghai 200092China
出 版 物：《Waste Disposal and Sustainable Energy》 (废弃物处置与可持续能源（英文）)
年 卷 期：2020年第2卷第2期
页 面：113-125页
核心收录：
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学]
主 题：Sewage sludge ash Acid leaching Phosphorous speciation Quantitative X-ray diffraction analysis Rietveld refinement
摘 要：Phosphorus(P)is an essential and limited *** sewage sludge ash(ISSA)contains a high amount of P,which can be recovered using chemical leaching ***,the recovery ratio depends on the speciation of P and the leaching *** this study,hydrochloric acid was used as a leaching agent,and the effects of the hydrochloric acid concentration,leaching time,temperature,and liquid-solid ratio on the P leaching ratio were ***,the co-leaching of macro-metals Ca,Al,Fe,and Mg was *** results showed that P leached rapidly within 30 min,where the leaching rate reached more than 80%and then gradually *** leaching concentrations of Ca and Mg had a significant correlation(correlation coefficient r^(2)0.90),and both were leached *** and P had similar leaching patterns,where the leaching rates increased initially and then decreased with time at 0.2 mol/L *** to X-ray diffraction analysis and Rietveld refinement,the P in ISSA was mainly present in the forms of Mg_(3)Ca_(3)(PO_(4))_(4) and AlPO_(4).When leached using 0.2 mol/L HCl at 55℃ with a liquid-to-solid ratio of 20 L/kg,the AlPO_(4) and Fe_(3)(H_(2)O)_(3)(PO_(4))_(2) in ISSA dissolved initially and then precipitated on the surface of the solid phase,thereby impeding further P leaching.
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