【摘 要】
：
Phosphorus(P)is an element vital for all living organisms,yet the worlds reserves of phosphate rock are becoming depleted.This study investigated an effective P
【机 构】
：
State Key Laboratory of Pollution Control and Resource Reuse
【基金项目】
：
the Major Science and Technology program for Water Pollution Control and Treatment;国家自然科学基金;the Specialized Research Found for Doctoral Program of Higher Education of China
论文部分内容阅读
Phosphorus(P)is an element vital for all living organisms,yet the worlds reserves of phosphate rock are becoming depleted.This study investigated an effective P recovery method from sludge ash via struvite precipitation.Results showed that more than 95％ of the total P content was extracted from sludge ash by applying 0.5 mol/L HCl at a liquid/solid ratio of 50 mL/g.Although heavy metal leaching also occurred during P extraction,cation exchange resin efficiently removed the heavy metals from the P-rich solution.Orthogonal tests showed that the optimal parameters for P precipitation as struvite would be a Mg∶N∶P molar ratio of 1.6∶1.6∶1 at pH 10.0.X-ray diffraction analysis validated the formation of struvite.Further investigations revealed that the harvested precipitate had a high struvite content(97％),high P bioavailability(94％),and low heavy metal content,which could be considered a high quality fertilizer.
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