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Partitioning and speciation of selenium in wet limestone flue gas desulphurisation systems: A review

机译：湿石灰石烟气脱硫系统中硒的分配与形态分析

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This paper presents a general review of the selenium chemistry and fate in wet limestone flue gas desulphurisation (FGD) systems and major factors associated to the operation of wet limestone FGDs affecting Se oxidation. Selenium chemistry in FGD waters is more than the interconversion between selenite and selenate; selenium can form a complex array of chemical aqueous complexes some of them analogous to those of sulphur as well as interact with polyoxosulfur anions. However, most of Se-aqueous complexes that may encounter in FGD waters are still unidentified. FGD water re-circulation, fly ashes (FAs) accumulated in the FGD scrubber, oxi-reduction potential (ORP), water flow quantity, flow variability, and pressure are operating FGD conditions that may affect the implementation of effective strategies in management and control of Se in FGD waters. These operating FGD conditions may have a strong influence in the reaction kinetics and the mass transfer of water and constituents through the water treatment processes for Se. Other influences that will affect selenium removal in FGDs can be the oxidizing and reducing agents complexing or chelating agents and/or competing oxyanions. Development of effective strategies in management and control of Se is also complicated by difficulties in measuring and analysing selenium speciation in FGD wastewaters. The effect of sample handling and preservation methods on selenium speciation is not well understood yet and analytical methods may not achieve accurate total selenium concentrations in complex FGD wastewater matrices. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文概述了湿法石灰石烟气脱硫（FGD）系统中的硒化学和命运以及与影响Se氧化的湿法石灰石烟气脱硫相关的主要因素。烟气脱硫水域中的硒化学作用远胜于亚硒酸盐和硒酸盐之间的相互转化。硒可以形成化学水络合物的络合物阵列，其中一些与硫类似，并且可以与聚氧硫阴离子发生相互作用。但是，在烟气脱硫水域中可能遇到的大多数Se水溶液络合物仍未确定。 FGD水再循环，FGD洗涤塔中积累的粉煤灰（FAs），氧化还原势（ORP），水流量，流量可变性和压力是FGD运行的条件，可能会影响有效的管理和控制策略的实施烟气脱硫水域中的硒含量。这些运行的FGD条件可能会对反应动力学以及通过Se的水处理过程中水和成分的传质产生重大影响。将影响烟气脱硫中硒去除的其他影响因素可能是氧化剂和还原剂络合剂或螯合剂和/或竞争性氧阴离子。由于难以测量和分析烟气脱硫废水中的硒形态，因此难以制定有效的硒管理和控制策略。样品处理和保存方法对硒形态的影响尚不十分清楚，而且分析方法可能无法在复杂的烟气脱硫废水基质中获得准确的总硒浓度。 （C）2017 Elsevier Ltd.保留所有权利。

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