Site-specific diel mercury emission fluxes in landfill: Combined effects of vegetation and meteorological factors.
Site-specific diel mercury emission fluxes in landfill: Combined effects of vegetation and meteorological factors.
复制标题
DOI：
10.1016/j.wasman.2016.09.006
复制
发表时间：
2017
期刊：
影响因子：
8.1
通讯作者：
Yang Liu;Boran Wu;Yongxia Hao;Wei-Ping Zhu;Zhonggen Li;Xiaoli Chai
中科院分区：
文献类型：
--
作者：
Yang Liu;Boran Wu;Yongxia Hao;Wei-Ping Zhu;Zhonggen Li;Xiaoli Chai
研究了填埋场不同地表覆盖条件下的汞排放通量。结果表明，不同覆盖条件下汞排放通量的日变化规律相似，在中午达到峰值，在夜间下降。研究了植被生理特征和气象条件等环境因素对mef的影响。结果表明，白天植被的生长促进了厌氧单元中汞的释放，而在半好氧单元中，去除植被后覆盖土壤中汞含量较高，促使光还原途径成为汞释放的主要途径，增加了mef。mef与太阳辐射和气温正相关，与相对湿度负相关。不同环境参数对MEFs的相关系数表明，在厌氧装置中，太阳辐射是9月份对MEFs的主要影响因素，而气温是12月份的主要决定因素。这些观测结果表明，气象条件对汞释放机制的影响因植被和土壤途径而异。
Mercury emission fluxes (MEFs) under different surface coverage conditions in a landfill were investigated in this study. The results show similar diel patterns of Hg emission flux under different coverage conditions, with peak fluxes occurring at midday and decreasing during night. We examined the effects of environmental factors on MEFs, such as the physiological characteristics of vegetation and meteorological conditions. The results suggest that growth of vegetation in the daytime facilitates the release of Hg in the anaerobic unit, while in the semi-aerobic unit, where vegetation had been removed, the higher mercury content of the cover soil prompted the photo-reduction pathway to become the main path of mercury release and increased MEFs. MEFs are positively correlated with solar radiation and air temperature, but negatively correlated with relative humidity. The correlation coefficients for MEFs with different environmental parameters indicate that in the anaerobic unit, solar radiation was the main influence on MEFs in September, while air temperature became the main determining factor in December. These observations suggest that the effects of meteorological conditions on the mercury release mechanism varies depending on the vegetation and soil pathways.