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Kinetics effects on preferential struvite accumulation in wastewater

机译：动力学对废水中鸟粪石优先堆积的影响

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摘要

The kinetics of struvite (MgNH sub(4)PO sub(4) times 6H sub(2)O) formation was studied to determine the cause of preferential accumulation at certain locations within the anaerobic digestion and postdigestion processes in wastewater treatment. Mechanisms controlling nucleation were also studied in laboratory induction time experiments. A field study of struvite accumulation on postdigestion process appurtenances was conducted to evaluate mechanisms affecting crystal growth rates. Struvite nucleation was found to be reaction-controlled, with nucleation strongly dependent on the struvite supersaturation level. Increased mixing intensity at constant supersaturation had a minor effect on induction times. The crystal growth rate was found to be transport-limited, with the growth rate a function of mixing energy input. Evaluation of the effect of pH change resulting from CO sub(2) evolution in high turbulence areas showed that it has a minor influence on the crystal growth rate. Preferential struvite accumulation was found to be primarily controlled by growth kinetics, which was strongly dependent on mixing energy. Preferential accumulation of struvite on selected construction materials was also studied, and experimental evidence suggested that surface roughness exerted the greatest control over preferential struvite accumulation on various materials under similar mixing and supersaturation conditions.
机译：研究了鸟粪石（MgNH sub（4）PO sub（4）乘以6H sub（2）O）的动力学，以确定废水处理中厌氧消化和后消化过程中某些位置优先堆积的原因。在实验室诱导时间实验中还研究了控制成核的机制。进行了对消化后过程中鸟粪石积累的现场研究，以评估影响晶体生长速率的机理。发现鸟粪石的成核作用是反应控制的，成核作用强烈依赖于鸟粪石的过饱和度。恒定过饱和度下增加的混合强度对诱导时间影响很小。发现晶体的生长速率受运输限制，其生长速率是混合能量输入的函数。评估高湍流区中由CO sub（2）演变引起的pH值变化的影响表明，它对晶体生长速率的影响较小。发现优先的鸟粪石积累主要受生长动力学控制，生长动力学强烈依赖于混合能。还研究了鸟粪石在某些建筑材料上的优先堆积，实验证据表明，在相似的混合和过饱和条件下，表面粗糙度对各种材料上优先的鸟粪石堆积具有最大的控制作用。

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