Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 766, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.144099
Keywords
Bioremediation; Bacteria; Plants; Earthworms; Sewage sludges; In situ; Metals; PAHs; Pesticides
Categories
Funding
- Basque Government [IT810-13, ITO18-16]
- MINECO [CTM2017-87766-R, AGL 2015-64481-C2-1-R, AGL2016-76592-R]
- [PhytoSUDOE-SOE1/P5/E0189]
Ask authors/readers for more resources
The study explored different methods for soil remediation, with biological methods showing better results but longer time consumption. Dual and triple treatment combinations achieved higher reduction rates, suggesting the potential for improving remediation performance through combining different biological strategies.
Increasing soil loss and the scarcity of useful land requires new reusing strategies. Thus, recovery of polluted soils recovery offers a chance for economic and social regeneration. With this objective, different soil cleaning technologies have been developed during the last few decades. On one hand, classical physical and/or chemical technologies can be found which are efficient, but have high costs and impacts upon ecosystems. On the other hand, biological methods (such as phytoremediation, bioremediation and vermiremediation) are relatively cost effective and eco-friendly, but also more time-consuming. These biological methods and their yields have been widely studied but little is known about the interaction between different soil cleaning methods. The combination of different biological strategies could lead to an improvement in remediation performance. Hence, in the present work, different micro-, vermi- and phyto-remediation combinations are applied in a sewage sludge polluted landfill in Gemika-Lumo (Basque Country) which was used as a disposal point for decades, in search of the treatment (single) or combination (dual or triple) of treatments with best remediation yields. Eight experimental groups were applied (n=3) placing earthworms (E), bacteria (B), plants (P), bacteria+earthworms (B+E), bacteria+ plants (B+P), plants+earthworms (P+E) plants+bacteria+earthworms (P+B-E) and a non-treated (N.T.) group in the experimental plot (Landfill 17), for 12 months. In order to assess the efficiency of each treatment, a complete characterization (chemical and ecotoxicological) was carried out before and after remediation. Results showed high removal rates for dieldrin (between 50% and 78%) in all the experimental groups. In contrast, removal rates around 20-25% were achieved for heavy metals (Cd 15%-35%; Ni 24%-37%: Pb 15%-33%; Cr 7%-39%) and benzo(a)pyrene (19.5%-28%). The highest reductions were observed in dual (P +E, B+E) and triple (P divided by B+E) treatments. The best elimination yields were obtained after P-B-E treatment, as highlighted by the battery of ecotoxicological tests and bioassays performed with earthworms, plants and bacteria. (C) 2020 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available