期刊
WATER SCIENCE AND TECHNOLOGY
卷 58, 期 8, 页码 1687-1692出版社
IWA PUBLISHING
DOI: 10.2166/wst.2008.557
关键词
Ca2+; dissolution method; element analyses; pH; Struvite; XRD
资金
- China's High-tech R & D (863) Program [2006AA06Z320]
- Beijing Academic Innovation Group in Sustainable Water/waste Recycle Technologies [BJE10016200611]
Struvite formation is mainly controlled by concentrations of Mg2+, NH4+ and PO43+, pH, temperature, and other ions like Ca2+. Experiments evaluating the effects of pH and Ca2+ on struvite formation indicated that XRD is only a qualitative method to analyze the struvite content in precipitating compounds, which was also reflected in microscopic images. The element analyses preceded by a dissolution method were introduced to quantitatively determine the struvite content and were shown to be an efficient enough method. Based on element analyses, the struvite content could be calculated according to the N content in the precipitations, based on the molar ratios (1:1:1) of Mg, N and P in pure struvite (MgNH4PO4 center dot 6H(2)O). It was found that the optimal pH ranges for the struvite content >90% were respectively at 7.5 similar to 9.0 with ultra pure water as solute and at 7.0 similar to 7.5 with tap water (mainly consisting of ground water) as solute. Applying a pH > 8.0 in real wastewater containing Ca2+ might result in impure struvite contents in the precipitate due to the effect of Ca2+.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据