【摘要】 采用粉末活性炭(PAC)去除饮用水中2-甲基异莰醇(MIB)、2,4,6-三氯茴萫醚(TCA)、2-异丙基-3-甲氧基吡嗪(IPMP)和2-异丁基-3-甲氧基吡嗪(IBMP)等4种常见的土霉味物质,研究了PAC种类、PAC投加量、嗅味物质的初始浓度、余氯、水质等因素对PAC去除土霉味物质的影响。结果表明,PAC吸附对嗅味物质的去除主要发生在前1 h内;煤质PAC对MIB有更高的去除率;在一定的吸附时间和活性炭投加量下,PAC对痕量嗅味物质的去除率与其初始浓度无关;余氯和有机物的存在降低了PAC对嗅味物质的吸附容量,水质对去除嗅味物质也有很大的影响。更多还原

【Abstract】 The powdered activated carbon(PAC) was used to remove four earthy-musty odorants including 2-methylisoborneol(MIB),2,4,6-trichloroanisole(TCA),2-isopropyl-3-methoxy-pyrazine(IPMP) and 2-isobutyl-3-methoxy-pyrazine(IBMP) in drinking water.The influence of PAC types,PAC dosage,initial concentration of the odorants,residual chlorine,water quality and other factors on the removal of earthy-musty compounds by PAC was investigated.The results show that the removal of odorants by PAC occurs mainly during the first 1 h of adsorption.Compared with the wood-based PAC,the coal-based PAC evidently improves the removal efficiency of poorly adsorbed compounds like MIB.Under a given time and a particular carbon dosage,the removal rate of trace odorants is not influenced by the initial concentration of the odorants.The adsorptive capacity of PAC for target compounds is reduced by residual chlorine and background organics.The characteristics of raw water have vast influence on the removal of target compounds by PAC.更多还原