Influence of airflow rate and substrate nature on heterogeneous struvite precipitation
Influence of airflow rate and substrate nature on heterogeneous struvite precipitation
复制标题
气流速度和基质性质对非均相鸟粪石沉淀的影响
DOI：
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发表时间：
2009
影响因子：
2.8
通讯作者：
M. B. Amor
中科院分区：
文献类型：
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作者：
H. Saidou;S. B. Moussa;M. B. Amor
在废水处理厂中，在废水的厌氧消化过程中，在管道和循环泵中可以形成由鸟粪石晶体组成的硬垢。研究了气流速度和基质性质对鸟粪石沉淀成核类型、诱导期和过饱和系数的影响。使用类似于为碳酸钙沉淀设计的结晶反应器。通过空气鼓泡提高合成废水溶液的pH。实验结果表明，气流促进了鸟粪石的不均匀沉淀。对结垢的敏感性在聚酰胺和聚氯乙烯上比在不锈钢上更重要。在所有情况下，X射线衍射和红外光谱显示沉淀的固相仅为鸟粪石。没有观察到晶体形态的差异。然而，在相似的实验条件下，不锈钢材料的鸟粪石粒度高于塑料材料。
In wastewater treatment plants a hard scale consisting of struvite crystals can be formed, in pipes and recirculation pumps, during anaerobic digestion of wastewater. This study was conducted to evaluate the effect of airflow rate and substrate nature on nucleation type, induction period and supersaturation coefficient during struvite precipitation. A crystallization reactor similar to that designed for calcium carbonate precipitation was used. The pH of synthetic wastewater solution was increased by air bubbling. Experimental results indicated that the airflow increased heterogeneous precipitation of struvite. The susceptibility to scale formation was more important on polyamide and polyvinyl chloride than on stainless steel. In all cases, X‐ray diffraction and infrared spectroscopy showed that the precipitated solid phase was solely struvite. No difference in crystal morphology was observed. However, at similar experimental conditions, the particle size of struvite was higher for stainless‐steel material than that for plastic materials.