Rare Earth Elements and Other Trace Elements in Wastewater Treatment Sludges

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概要

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• 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, Sin, Gd, Tb, Dy, Ho, Er, Tin, 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 were almost fiat. 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 fiat plots. The sludges that did not show a flat 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 Bithan the soil.

• 社団法人日本土壌肥料学会の論文

著者

• Arai Shigemitsu

  National Institute Of Agro-environmental Sciences Tsukuba

• Arai Shigemitsu

  National Institute Of Agro-environmental Sciences

• Kawasaki Akira

  National Institute of Agro-Environmental Sciences

• Kimura Ryosuke

  National Institute of Agro-Environmental Sciences

• Kawasaki Akira

  National Inst. Agro‐environmental Sci. Ibaraki Jpn

関連論文

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