摘要
电厂中广泛应用的湿法脱硫系统在脱硫的同时会捕集烟气中的部分痕量元素,并将其转移到石膏浆液中,这对脱硫石膏的综合利用带来潜在的影响。该文以典型的湿法脱硫系统为研究对象,通过现场取样测量的方法,分别对石膏浆液脱水系统及废水处理系统中As、Be、Co、Cr、Hg、Mn、Ni、Pb、Sb和Se共10种痕量元素的分布进行了考察,检测了湿法脱硫系统捕获的痕量元素在脱硫石膏等产物中的分布情况,并探讨了脱硫石膏对浆液中痕量元素的富集机理。结果表明:石膏浆液经过脱水后,As、Be、Co、Cr、Hg、Ni、Pb、Sb和Se主要进入石膏中,Mn则主要进入废水中;废水经过处理后,Se主要存在于处理后的中水中,其他元素则都主要进入污泥中。这些痕量元素在石膏和污泥中的赋存形态稳定性不高,因而需要对石膏和污泥进行稳定化处理。
Wet flue gas desulphurization （WFGD） system, which is widely used in power plants, transfers trace elements in the flue gas to a gypsum slurry while removing SO2. This transfer then leads to potential environmental hazards when the gypsum is further utilized. This research focuses on the trace elements in a typical WFGD system. Onsite sampling was used to investigate the distributions of As, Be, Co, Cr, Hg, Mn, Ni, Pb, Sb and Se in WFGD systems. The results show the transport mechanisms for trace element enrichment in gypsum slurries. The results show that most of the trace elements remain in the gypsum during de watering process except for Mn. Most Se remains in the treated water during the waste water treatment process while virtually all the other trace elements are transferred to the water treatment sludge. The occurrence of these trace elements in the gypsum and the sludge isnot stable. Therefore, stabilization treatment is needed for both the gypsum and the sludge.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第3期330-335,共6页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金项目(50876052)
关键词
痕量元素
湿法脱硫
脱硫石膏
trace element
wet flue gas desulphurization
gypsum
