Rapid Increase in Cement-Related Mercury Emissions and Deposition in China during 2005-2015
Rapid Increase in Cement-Related Mercury Emissions and Deposition in China during 2005-2015
复制标题
2005-2015年中国水泥相关汞排放和沉降快速增加
DOI：
10.1021/acs.est.0c03512
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发表时间：
2020-11-17
影响因子：
11.4
通讯作者：
Shu, Jiong
中科院分区：
文献类型：
--
作者：
Chen, Long;Liang, Sai;Shu, Jiong
水泥行业已成为我国最大的汞排放源。更好地了解汞排放和沉积特征以及汞排放变化的驱动因素，可以提高对相关风险的认识，并支持有效的政策制定。结果表明，由于中国新型悬浮预热器和预分解炉（NSP）技术的使用大幅增加，2005-2015年期间，水泥相关汞排放量增加了约两倍，从80.0兆吨/年增加到144.0兆吨/年。这导致了中国陆地大气沉降量从37.9亿年增加到75.9亿年（-1）。与绝大多数汞排放部门相比，水泥生产中汞排放量的同样增加会导致更多的沉积，因为该部门中高水溶性二价汞的比例很大。二价汞的含量每增加1%，中国陆地沉积量将增加0.37兆克/年。水泥产品的技术改进和多样化是抵消2005-2015年期间经济导致的水泥相关汞排放增长的两大驱动力。中国水泥行业迫切需要采取措施降低汞排放强度，以应对新型干法技术使用的进一步增加，并避免产能过剩，以应对真实的房地产刺激和水泥需求的增加。
The cement industry has become the largest mercury (Hg) emission source in China. Better understanding Hg emission and deposition characteristics and drivers of Hg emission changes can increase the awareness of related risks and support effective policy making. The results show that due to the substantial increase in the use of new suspension preheater and precalciner (NSP) technology in China, an approximate twofold increase from 80.0 to 144.0 Mg year(-1) was observed for the cement-related Hg emissions during 2005-2015, which has resulted in a considerable increase in atmospheric deposition over terrestrial China from 37.9 to 75.9 Mg year(-1). Compared to the great majority of emission sectors, the same increase in Hg emissions from cement production can cause more deposition due to the large share of highly water-soluble divalent Hg in the sector. Each 1% increase in the share of divalent Hg can result in an increase of 0.37 Mg year(-1) in deposition over terrestrial China. Technical improvement and diversification of cement products are two major driving forces offsetting the economy-induced growth in cement-related Hg emissions during 2005-2015. Measures aimed at reducing the Hg emission intensity against the further increase in the use of NSP technology and avoiding overcapacity against the stimulation of real estate and increasing cement demands are urgently needed for the cement industry in China.