Power Plant Bromide Discharges and Downstream Drinking Water Systems in Pennsylvania
Power Plant Bromide Discharges and Downstream Drinking Water Systems in Pennsylvania
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DOI：
10.1021/acs.est.7b03003
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发表时间：
2017-10-17
影响因子：
11.4
通讯作者：
VanBriesen, Jeanne M.
中科院分区：
文献类型：
--
作者：
Good, Kelly D.;VanBriesen, Jeanne M.
配备湿法烟气脱硫（FGD）系统的燃煤发电厂与溴化物水平的增加以及下游饮用水厂消毒副产品的增加有关。由于美国环保署的分析表明，很少有饮用水设施会受到发电厂溴化物排放的影响，因此在最近的蒸汽发电废水限制准则和标准（ELG）中，溴化物未被列为受管制的成分。本分析采用分水岭的方法，以确定宾夕法尼亚州的饮用水取水口下游的湿法烟气脱硫排放，并评估潜在的溴化物排放的影响。为250万人服务的22个公共饮用水系统被确定为至少一个湿法脱硫排放的下游。在平均八月条件下（一般低流量，最小稀释）在接收河流，预测溴浓度的中位数在宾夕法尼亚州的湿法烟气脱硫取水口位置从5.2到62 μ g/L的基础方案（仅包括煤中的天然溴）和16至190微克/升（溴添加情景）（用于汞控制的天然加添加溴化物）;范围取决于溴化物负荷和接收流稀释能力。
Coal-fired power plants equipped with wet flue gas desulfurization (FGD) systems have been implicated in increasing bromide levels and subsequent increases in disinfection byproducts at downstream drinking water plants. Bromide was not included as a regulated constituent in the recent steam electric effluent limitations guidelines and standards (ELGs) since the U.S. EPA analysis suggested few drinking water facilities would be affected by bromide discharges from power plants. The present analysis uses a watershed approach to identify Pennsylvania drinking water intakes downstream of wet FGD discharges and to assess the potential for bromide discharge effects. Twenty-two (22) public drinking water systems serving 2.5 million people were identified as being downstream of at least one wet FGD discharge. During mean August conditions (generally low-flow, minimal dilution) in receiving rivers, the median predicted bromide concentrations contributed by wet FGD at Pennsylvania intake locations ranged from 5.2 to 62 mu g/L for the Base scenario (including only natural bromide in coal) and from 16 to 190 mu g/L for the Bromide Addition scenario (natural plus added bromide for mercury control); ranges depend on bromide loads and receiving stream dilution capacity.