Assessment of Endotoxin Removal from Reclaimed Wastewater Using Coagulation-Flocculation
Assessment of Endotoxin Removal from Reclaimed Wastewater Using Coagulation-Flocculation
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DOI：
10.4236/jwarp.2016.89070
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发表时间：
2016-07
期刊：
影响因子：
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通讯作者：
Mokhtar Guizani;M. Zavala;N. Funamizu
中科院分区：
文献类型：
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作者：
Mokhtar Guizani;M. Zavala;N. Funamizu
经过生物处理后，废水仍然含有内毒素活性物质。然而，由于存在饮用水再利用的趋势，并且由于内毒素活性物质可能对人类健康产生有害影响，因此将其从水中去除至关重要。脂多糖内毒素具有疏水基团，并且使用凝结-絮凝替代物去除它们被认为是有效的。因此，他们的去除再生水使用混凝-絮凝工艺进行了评估。对日本札幌污水处理厂的二级出水样品进行了研究。结果表明，该工艺具有良好的内毒素去除效果，最佳内毒素去除率可达40.5%。通过将pH值调节在4 - 5.5的低范围内，硫酸铝剂量为80 mg/L，使内毒素去除最大化。混凝剂投加量的进一步增加并不能提高去除效率。DOC和浊度的去除在较高的pH范围5.5 - 6.5时达到最佳。因此，混凝和絮凝可以被认为是第一个障碍，并应随后进行其他处理，以安全地回用再生水。
Following biological treatment, wastewater continues to have endotoxic active materials. However, because there is a trend of potable reuse and because endotoxic active materials potentially have harmful effects on human health, their removal from water is crucial. Lipopolysaccharide endotoxin has hydrophobic groups, and their removal using a coagulation-flocculation alternative is believed to be efficient. Thus, their removal from reclaimed wastewater using the coagulation-flocculation process was assessed. Secondary effluent samples from a wastewater treatment plant located in Sapporo, Japan, were investigated. It was found that this process gave satisfactory results in removing endotoxins, with an optimum removal rate of up to 40.5%. The endotoxin removal was maximized by adjusting the pH at the low range 4 - 5.5, with an aluminum sulfate dose of 80 mg/L. Further increases of the coagulant dose did not improve the removal efficiency. DOC and turbidity removal were at their optimum at higher pH range 5.5 - 6.5. Thus coagulation and flocculation could be considered as the first barrier and should be followed by other treatments to safely reuse reclaimed wastewater.