Rare earth elements and other trace elements in wastewater treatment sludges
Rare earth elements and other trace elements in wastewater treatment sludges
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DOI：
10.1080/00380768.1998.10414465
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发表时间：
1998-09-01
影响因子：
2
通讯作者：
Arai, S
中科院分区：
文献类型：
--
作者：
Kawasaki, A;Kimura, R;Arai, S
为了评价污泥对土壤的微量元素污染的可能性，测定了污水处理污泥中稀土元素（La、Ce、Pr、Nd、Sm、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu）和其它微量元素（Be、As、Ag、Cd、Sb、Cs、Bi、U）的含量。在粪便处理厂的污泥（粪便污泥）和食品工业废水处理厂的污泥（食品工业污泥）中，稀土元素的分布模式与大陆地壳中的平均稀土元素几乎是平的。认为未污染污泥的稀土配分模式反映了陆壳配分模式。化学工业污水处理厂污泥（化工污泥）和城市污水处理厂污泥的稀土元素地壳标准化配分模式并不总是呈帽状分布。10个粪便污泥样品和14个污水污泥样品中各元素的变异系数分别为34 ~ 77%和26 ~ 84%。在10个食品工业污泥和10个化学工业污泥样品中，系数分别为60 ~ 143%和67 ~ 172%。食品工业污泥和化工工业污泥中各元素含量的差异大于粪便污泥和污水污泥中各元素含量的差异，所有污泥中Be、As、Cs、RE、U的含量均低于或等于农田土壤中的含量。一些食品和化学工业的污泥含有大量的银，镉，锑比土壤。所有的粪便污泥和污水污泥中的银和铋含量远远高于土壤。
In order to evaluate the possibility of contamination of soil with trace elements by the application of sludges to soil, the contents of rare earth elements (REEs; La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and other trace elements (Be, As, Ag, Cd, Sb, Cs, Bi, and U) in wastewater treatment sludges were determined. In sludges of night soil treatment plants (night soil sludges) and sludges of wastewater treatment plants in the food industry (food industry sludges), the distribution patterns of REEs normalized versus average REEs in the continental crust mere almost flat. It was considered that the REE patterns of uncontaminated sludges reflected the pattern of the continental crust. The crust-normalized REE patterns of sludges of wastewater treatment plants in the chemical industry (chemical industry sludges) and municipal sewage sludges did not always show hat plots. The sludges that did not show a hat REE pattern were considered to be contaminated with some of the REEs.The coefficient of variation of each element determined among the 10 samples of night soil sludges and the 14 samples of sewage sludges ranged from 34 to 77% and from 26 to 84%, respectively. Among the 10 samples of food industry sludges and the 10 samples of chemical industry sludges, the coefficient ranged from 60 to 143% and from 67 to 172%, respectively. The variations of the content of each element among the food industry sludges or the chemical industry sludges were larger than those among the night soil sludges or the sewage sludges.The contents of Be, As, Cs, REEs, and U in all the sludges were lower than or the same as those in a field soil. Some of the food and chemical industry sludges contained larger amounts of Ag, Cd, and Sb than the soil. All the night soil sludges and sewage sludges contained much larger amounts of Ag and Bi than the soil.