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Evaluation Studies
Journal Article
Evaluation of dredged sediment co-composted with green waste as plant growing media assessed by eco-toxicological tests, plant growth and microbial community structure.
Journal of Hazardous Materials 2017 July 6
Dredged sediments have currently no broad reuse options as compared to other wastes due to their peculiar physico-chemical properties, posing problems for the management of the large volumes of sediments dredged worldwide. In this study we evaluated the performance of sediment (S) co-composted with green waste (GW) as growing medium for ornamental plants. Analysis of the microbial community structure, eco-toxicological tests, were conducted on sediments at 1:1 and 3:1S:GW composting ratios. Sediment-based growing media were then reused to growth the ornamental plant Photina x fraseri in a pilot-scale experiment and plants' physiological and chemical parameters were measured. The results showed that co-composting with green waste increased the diversity of bacteria, fungi and archaea as compared to the untreated sediments, and that both the 1:1 and 3:1 S:GW composted sediments had no substantial eco-toxicological impacts, allowing an excellent plant growth. We concluded that co-composted of sediment with green waste produce a growing medium with suitable properties for growing ornamental plants, and represent a sustainable option for beneficial use of dredged sediments.
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