Municipal sewage sludge compost promotes Mangifera persiciforma tree growth with no risk of heavy metal contamination of soil

Application of sewage sludge compost (SSC) as a fertilizer on landscaping provides a potential way for the effective disposal of sludge. However, the response of landscape trees to SSC application and the impacts of heavy metals from SSC on soil are poorly understood. We conducted a pot experiment t...

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Bibliographic Details
Published in:Scientific reports 2017-10, Vol.7 (1), p.13408-11, Article 13408
Main Authors: Chu, Shuangshuang, Wu, Daoming, Liang, Liyin L., Zhong, Fengdi, Hu, Yaping, Hu, Xinsheng, Lai, Can, Zeng, Shucai
Format: Article
Language:English
Subjects:
631/449/2661
704/172/4081
Cadmium
Composts
Contamination
Copper
Fertility
Heavy metals
Humanities and Social Sciences
Landscaping
Lead
Mangifera
Metal concentrations
Metals
multidisciplinary
Municipal wastes
Municipal wastewater
Risk reduction
Science
Science (multidisciplinary)
Sewage disposal
Sewage sludge
Sludge
Sludge disposal
Soil contamination
Soil pollution
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Summary:Application of sewage sludge compost (SSC) as a fertilizer on landscaping provides a potential way for the effective disposal of sludge. However, the response of landscape trees to SSC application and the impacts of heavy metals from SSC on soil are poorly understood. We conducted a pot experiment to investigate the effects of SSC addition on Mangifera persiciforma growth and quantified its uptake of heavy metals from SSC by setting five treatments with mass ratios of SSC to lateritic soil as 0%:100% (CK), 15%:85% (S15), 30%:70% (S30), 60%:40% (S60), and 100%:0% (S100). As expected, the fertility and heavy metal concentrations (Cu, Zn, Pb and Cd) in substrate significantly increased with SSC addition. The best performance in terms of plant height, ground diameter, biomass and N, P, K uptake were found in S30, implying a reasonable amount of SSC could benefit the growth of M. persiciforma . The concentrations of Cu, Pb and Cd in S30 were insignificantly different from CK after harvest, indicating that M. persiciforma reduced the risk of heavy metal contamination of soil arising from SSC application. This study suggests that a reasonable rate of SSC addition can enhance M. persiciforma growth without causing the contamination of landscaping soil by heavy metals.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-13895-y