福建漳州后石电厂烟气脱硫排水海域的海水和沉积物中汞的含量变化分析

Analysis of mercury in drainage waters and sediment from seawater flue gas desulfurization system of Houshi power plant in Zhangzhou,Fujian

根据后石电厂近15年的监测资料,简述了温排海域海水和沉积物中Hg含量的变化情况,并结合6年的脱硫工艺流程监测数据分析了Hg含量升高的原因,最后通过参考文献资料推算出电厂附近海域的底栖生物对Hg的累计效应。分析结果表明:1)在电厂温排海域内,>1℃温升区内沉积物中的Hg含量显著高于≤1℃温升海域;2)脱硫工艺监测结果表明:在脱硫工艺过程中Hg的转化率逐年升高;3)通过文献资料推算出电厂附近底栖生物(牡蛎)体内的总汞(THg)含量为0.488 mg/kg。为降低Hg的暴露风险,建议脱硫电厂温排海域海水中Hg含量不能超过0.110μg/L。

In this paper, changes of mercury in drainage waters and sediment from seawaters flue gas desulfu-rization system of coal-fired power plant were described in the last 15 years, the causes of elevated mercury levels combining with 6 years of desulfurization process monitoring data were analyzed, and the cumulative effect of mercury on the sea bottom dwellers near the power plant were calculated. Analysis results showed that： 1 ） mercury content in sediment zone of ＆gt;1℃ temperature rise was significantly higher than that of ≤1℃ waters in thermal discharge waters; 2 ） The monitoring results showed that： the mercury rate increased year by year in the desulfurization system; 3 ） The THg of benthos （ oyster ） near the power plant was 0. 488 mg＆#183;kg-1 by calculating with literature data. In order to reduce the risk of mercury exposure, we suggested that the mercury in FGD thermal discharge waters must not exceed 0. 110 μg/L.