Removal of 2-methylisoborneol and geosmin in surface water treatment plants in Arizona
Removal of 2-methylisoborneol and geosmin in surface water treatment plants in Arizona
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DOI：
10.2166/aqua.2002.0016
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发表时间：
2002-07-01
影响因子：
4.3
通讯作者：
Brawley-Chesworth, A
中科院分区：
文献类型：
--
作者：
Bruce, D;Westerhoff, P;Brawley-Chesworth, A
许多公用事业公司都经历过味觉和气味事件，影响了公众对饮用水安全的看法。造成饮用水中土味和霉味的两种化合物是土豆素和2-甲基异龙脑(MIB)，它们是由蓝藻和放线菌产生的。在水处理厂(WTP)中，通常通过添加粉末活性碳(PAC)或强氧化剂来去除MIB和Geosmin。然而，根据水化学成分的不同，添加化学品的成本可能会很高，性能也会有所不同。优化水处理工艺和添加化学物质以去除MIB和Geosmin将对公用事业公司经济有利，并为客户提供服务。研究结果表明，传统的水处理工艺(混凝)不能对MIB和Geosmin的去除进行优化。在臭氧氧化过程中，相对于分子臭氧氧化，羟基自由基在MIB或Geosmin氧化中所占的比例更大。PAC在亚利桑那州饮用水中的吸附实验表明，溶解有机碳与MIB和Geosmin竞争PAC的吸附位置。公用事业公司应该在含有天然溶解有机碳的当地水域进行味道和气味去除测试，而不是依赖制造商在超纯水中的数据。实验室PAC实验很好地预测了全尺寸PAC的性能。
Many utilities experience taste and odour episodes that affect the public's perception of the safety of drinking water. Two compounds responsible for earthy and musty taste and odours in drinking water supplies are geosmin and 2-methylisoborneol (MIB), which are produced by blue-green algae and actinomycetes. MIB and geosmin are typically removed in water treatment plants (WTPs) through the addition of powdered activated carbon (PAC) or strong oxidants. However, chemical addition can be costly and performance variable, depending on the water chemistry. optimization of water treatment processes and chemical addition for removal of MIB and geosmin would be economically beneficial to utilities and provide a service to customers. Results from this research showed traditional water treatment processes (coagulation) could not be optimized for removal of MIB and geosmin. During ozonation, hydroxyl radicals accounted for a greater percentage of MIB or geosmin oxidation relative to molecular ozone oxidation. PAC adsorption experiments in Arizona drinking water showed that dissolved organic carbon competed with MIB and geosmin for PAC adsorption sites. Utilities should conduct taste and odour removal tests in local waters containing natural dissolved organic carbon and not rely on manufacturer data in ultra-pure water. Laboratory PAC experiments predicted full-scale PAC performance well.