Methylmercury input to the Mississippi River from a large metropolitan wastewater treatment plant
Methylmercury input to the Mississippi River from a large metropolitan wastewater treatment plant
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DOI：
10.1016/j.scitotenv.2008.07.039
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发表时间：
2008-11-15
影响因子：
9.8
通讯作者：
Nollet, Yabing H.
中科院分区：
文献类型：
--
作者：
Balogh, Steuen J.;Nollet, Yabing H.
甲基汞（MeHg）和总汞（THg）输入到密西西比河从一个大城市的污水处理厂进行了测量，以表征这些污染物的相对贡献的处理厂流负荷。甲基汞和总汞的浓度进行了测定过滤和未过滤的全水样本收集每周从处理厂的污水流和从上游的工厂排放的河流。工厂流出物中未经过滤的甲基汞浓度范围为0.034 - 0.062纳克/升，始终低于河流中的浓度（范围：0.083-0.227纳克/升）。在13周的采样期内，从处理厂流入河流的甲基汞含量为0.026至0.051克/天，平均为0.037克/天。河流上游的甲基汞含量因水文条件而异，范围为0.91 - 18.8 g d（-1），平均为4.79 g d（-1）。处理厂的排放量平均占河流中甲基汞负荷的1.6%，根据河流的水流条件，排放量从0.2%到3.5%不等。处理厂流出物中的甲基汞主要存在于过滤阶段（平均值：57%，
Methylmercury (MeHg) and total mercury (THg) inputs to the Mississippi River from a large metropolitan wastewater treatment plant were measured to characterize the relative contribution of the treatment plant to in-stream loads of these contaminants. Concentrations of MeHg and THg were determined in filtered and unfiltered whole water samples collected weekly from the treatment plant effluent stream and from the river upstream of the plant discharge. Unfiltered MeHg concentrations in the plant effluent ranged from 0.034 to 0.062 ng L(-1) and were always less than those in the river (range: 0.083-0.227 ng L(-1)). The MeHg loading to the river from the treatment plant ranged from 0.026 to 0.051 g d(-1) and averaged 0.037 g d(-1) over the 13-week sampling period. The in-stream MeHg load in the river upstream varied widely depending on hydrologic conditions, ranging from 0.91 to 18.8 g d(-1) and averaging 4.79 g d(-1). The treatment plant discharge represented 1.6%, on average, of the in-stream MeHg load, ranging from 0.2 to 3.5% depending on flow conditions in the river. MeHg in treatment plant effluent was primarily in the filtered phase (mean: 57%,