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首页> 外文期刊>Chemical speciation and bioavailability >Impact of fluorides on the removal of heavy metals from an electroplating effluent using a flocculent brewer’s yeast strain of Saccharomyces cerevisiae
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Impact of fluorides on the removal of heavy metals from an electroplating effluent using a flocculent brewer’s yeast strain of Saccharomyces cerevisiae

机译：絮凝剂酿酒酵母酵母菌株中氟化物对电镀废水中重金属去除的影响

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摘要

Besides several toxic heavy metals, electroplating effluents can have in solution different cations and anions, which may influence heavy metals removal by the biomass. Among them, fluorides are commonly used in the electroplating industries and thus can be found in the respective wastewaters. In the present work, the effect of the presence of fluorides in the efficiency of chromium(III), copper(II) and nickel(II) removal, from an effluent, by heat-inactivated cells of a brewing flocculent strain of Saccharomyces cerevisiae was evaluated. The presence of fluorides severely decreased (＞60%) the removal of chromium(III) by yeast biomass. This effect impaired the effective treatment of the effluent according to the US Environmental Protection Agency and the Portuguese law; conversely, a higher removal of copper(II) and nickel(II) was observed. This behaviour can be understood by metal speciation. In the presence of fluorides, chromium(III) was mainly complexed, becoming unavailable for yeast accumulation; this effect decreased the efficiency of chromium(III) removal. Thus, in the presence of fluorides, less chromium(III) is associated with biomass and consequently more yeast binding sites remain available for the uptake of other metals present in solution. This fact explains the increase of copper(II) and nickel(II) removal in the presence of fluorides.
机译：除了几种有毒的重金属之外，电镀废水在溶液中还可能具有不同的阳离子和阴离子，这可能会影响生物质对重金属的去除。其中，氟化物通常用于电镀行业，因此可以在各个废水中找到。在目前的工作中，通过酿酒酵母絮凝菌株的热灭活细胞的热灭活细胞中氟化物的存在对废水中铬（III），铜（II）和镍（II）的去除效率是这样的。评估。氟化物的存在严重降低了酵母生物量对铬（III）的去除（> 60％）。根据美国环境保护署和葡萄牙法律，这种影响削弱了废水的有效处理;相反，观察到较高的铜（II）和镍（II）去除率。这种行为可以通过金属形态来理解。在氟化物的存在下，铬（III）主要是络合的，无法用于酵母的积累。这种作用降低了铬（Ⅲ）的去除效率。因此，在存在氟化物的情况下，较少的铬（III）与生物质相关联，因此仍有更多的酵母结合位点可用于摄取溶液中存在的其他金属。这一事实解释了在氟化物存在下铜（II）和镍（II）去除量的增加。

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