Rift Valley Lake as a potential magnesium source to recover phosphorus from urine

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院环境生物技术重点实验室

	Rift Valley Lake as a potential magnesium source to recover phosphorus from urine
	Guadie, Awoke; Belay, Abaynesh; Liu, Wenzong; Yesigat, Asamin; Hao, Xiaodi; Wang, Aijie
刊名	ENVIRONMENTAL RESEARCH
	2020-05
卷号	184 页码:1-10
关键词	Phosphorus recovery Urine Magnesium source Rift valley lake Struvite
ISSN号	0013-9351
英文摘要	Phosphorus recovery from urine is a sustainable approach. However, the challenge of this process is the accessibility of economically feasible magnesium sources. This study aimed to investigate the potential of low-cost Rift Valley Lake magnesium (RVL-Mg) source for phosphorus recovery from urine, where data is deficient in the source area. The effect of various operational conditions such as storage, Mg:P ratio (0.8-2.0), pH (5.5-10.5), mixing speed (30-180 rpm), urease enzyme addition (50-700 mu L), urine dilution (0.11-9.0) and Ca:Mg ratio (0.3-2.5) was investigated. Under optimum operating conditions (M:P = 1.6, pH = 9, urease enzyme = 500 mu L, mixing speed = 120 rpm, 60 min precipitation), the phosphorus removal efficiencies were > 96% for actual and > 98% for synthetic urine. During storage, spontaneous phosphorus losses were observed from synthetic (24.0%) and actual (32.0%) hydrolyzed urine due to precipitation with calcium and magnesium. The phosphorus recovery efficiency was reduced at higher (0.11:1) and lower (9:1) urine to RVL-Mg dilution, which is related to lower supersaturation of phosphorus and magnesium ions, respectively. Addition of calcium did not affect phosphorus removal efficiency, but the effect was significant on crystal product. With low (<1.0) Ca:Mg ratio, the crystal chemical analysis showed that the product has to be pure struvite ( > 99%), which was further identified by scanning electron microscope and X-ray diffraction to be quality struvite that might be used for agricultural purpose. Overall, low-cost magnesium ion collected from Rift Valley Lake can be a potentially candidate for sustainable phosphorus recovery from urine and any other phosphorus containing waste stream.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/45209]
专题	生态环境研究中心_中国科学院环境生物技术重点实验室
推荐引用方式 GB/T 7714	Guadie, Awoke,Belay, Abaynesh,Liu, Wenzong,et al. Rift Valley Lake as a potential magnesium source to recover phosphorus from urine[J]. ENVIRONMENTAL RESEARCH,2020,184:1-10.
APA	Guadie, Awoke,Belay, Abaynesh,Liu, Wenzong,Yesigat, Asamin,Hao, Xiaodi,&Wang, Aijie.(2020).Rift Valley Lake as a potential magnesium source to recover phosphorus from urine.ENVIRONMENTAL RESEARCH,184,1-10.
MLA	Guadie, Awoke,et al."Rift Valley Lake as a potential magnesium source to recover phosphorus from urine".ENVIRONMENTAL RESEARCH 184(2020):1-10.