Ou Feng-Zhuang, Sun Guo-Ping, Xu Mei-Ying
Guangdong Institute of Microbiology, Guangzhou 510070, China.
Huan Jing Ke Xue. 2013 Oct;34(10):3888-93.
The object of this work was to evaluate the feasibility of calcium nitrate-regulatory agent for the stabilization of heavy metals in tidal sediments. The pilot-scale treatment was deployed in a section of the urban river in Ronggui, Foshan, which was heavily contaminated with Cu, Zn, Pb and Cr. For the remediation of the contaminated sediment, chemical speciation and stability of four elements were studied. The results indicated that: a)the percentage of four elements associated with reducible fraction and oxidizable fraction was decreased with the treatment of regulatory agent; b) the regulatory agent could effectively promote Cu, Zn, Pb, and Cr in sediment distributing in the residual fraction, which were increased by 4% , 20% , 21% and 23% after being treated by dosing regulatory agent for 22 days, with lower bioavailability in environment; c) the concentration of acid soluble fraction of Cu, Pb and Cr was increased except Zn. In general, the effect of stabilization for heavy metals Cu, Zn, Pb and Cr by regulatory agent is not ideal except Zn which has a certain effect, but the effect is not obvious.
这项工作的目的是评估硝酸钙调节剂对潮汐沉积物中重金属进行稳定化处理的可行性。中试规模的处理在佛山容桂一条受铜、锌、铅和铬严重污染的城市河段进行。为了修复受污染的沉积物，研究了这四种元素的化学形态和稳定性。结果表明：a) 随着调节剂的处理，与可还原态和可氧化态相关的四种元素的百分比降低；b) 调节剂能有效促进沉积物中的铜、锌、铅和铬分布到残余态，在投加调节剂处理22天后，其含量分别增加了4%、20%、21%和23%，在环境中的生物有效性较低；c) 除锌外，铜、铅和铬的酸溶态浓度增加。总体而言，调节剂对重金属铜、锌、铅和铬的稳定化效果除锌有一定效果外并不理想，且效果不明显。
