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Effects of organic substances on struvite crystallization and recovery

文献类型： 外文期刊

作者： Zhang, Qi 1 ; Zhao, Shouping 1 ; Ye, Xuezhu 1 ; Xiao, Wendan 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Qual & Stand Agroprod, 198 Shiqiao Rd, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Organic substances;Struvite;Accumulation device;Nutrients removal and recovery

期刊名称：DESALINATION AND WATER TREATMENT （ 影响因子：1.254； 五年影响因子：1.553 ）

ISSN： 1944-3994

年卷期： 2016 年 57 卷 23 期

页码：

收录情况： SCI

摘要： The effects of organic substances on struvite crystallization and recovery from synthetic wastewater were investigated. Experiments were completed during trials lasting 5days using a pilot reactor with two concentric stainless steel meshes as seed material. Various concentrations of organics were added to synthetic CO2-saturated solutions and the pH was elevated from an initial value of 6.5 using a degassing technique. The results showed the presence of glucose, humic acid, and citric acid could reduce the struvite mass accumulating rates as compared to solutions without organic additives. In addition, glucose as an additive could significantly promote the removal rate of phosphorus as opposed to the other two. The mechanisms of the inhibitory effects are specially focused on the fact citric acid is able to complex with Mg2+, and NH4+ in solution, while humic acid or glucose are able to adsorb onto the crystal surface. The recovered precipitates were analyzed using X-ray diffraction and were proven to have high purities. The morphologies of the precipitates were examined using scanning electron microscopy and found struvite particles aggregated together showing an irregular block shape, with the exception of particles recovered from solutions with humic acid, which showed a triangle-like shape.

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