Effects of Modified Excess Sludge on the Growth of Artemisia ordosica and Transformation of Heavy Metals
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A greenhouse experiment was accomplished to investigate the feasibility of excess sludge modified by coal fly ash pretreatment and γ-ray irradiation in soil application for cultivation of Artemisia ordosica. The results showed that modified excess sludge provided a positive effect on the growth of Artemisia ordosica. The modified excess sludge and aeolian sandy soil at the volume ratio of 1:2 was optimal, and nutrient concentrations of Artemisia ordosica reached the highest. In the aeolian sandy soil, the bio-concentration factor values of most heavy metals were less than 1.0 except for Cu, Zn, and Ni. The average bio-concentration factor values of heavy metals in Artemisia ordosica increased in a sequence of Mo < Cd < Fe < V < Cr < Co < Mn < Pb < Cu < Zn < Ni for all samples. Artemisia ordosica could be used to decrease the bioavailability and eco-toxicity of Ni, V, and Mo in all cultivation experiments of artificial soil, and Artemisia ordosica could also reduce the bioavailability and eco-toxicity of Cu, Cd, Cr, and Mn in the artificial soil of modified excess sludge and aeolian sandy soil at the volume ratio of 1:2.
KeywordsModified excess sludge Artemisia ordosica Heavy metal Transformation Species distribution
The authors are grateful for the funding and support provided by the following projects: National Natural Science Foundation of China (21203163); the National Natural Science Gold Project; Shaanxi Provincial Science and Technology Department Foster Industrialization Projects (15JF035); and the Scientific Research Starting Foundation for high-level professionals in Yulin University of China (No. 12GK04).
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