A comparison between biostimulation and bioaugmentation in a solid treatment of anaerobic sludge: Drug content and microbial evaluation

•T. versicolor is able to remove emerging pollutants from sewage sludge in biopiles.•A re-inoculation strategy for the biopiles was implemented and studied.•19 drugs were partial or totally removed in the fungal biopiles.•The evolution of the microbial communities of the biopiles was assessed.•Funga...

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Bibliographic Details
Published in:Waste management (Elmsford) 2018-02, Vol.72, p.206-217
Main Authors: Llorens-Blanch, G., Parladé, E., Martinez-Alonso, M., Gaju, N., Caminal, G., Blánquez, P.
Format: Article
Language:English
Subjects:
Bacteria
Biodegradation, Environmental
Biopiles
Bioremediation
Microbial shifts
Pharmaceutical products
Sewage
Sewage sludge
Trametes
Trametes versicolor
Waste Water
Water Pollutants, Chemical
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Summary:•T. versicolor is able to remove emerging pollutants from sewage sludge in biopiles.•A re-inoculation strategy for the biopiles was implemented and studied.•19 drugs were partial or totally removed in the fungal biopiles.•The evolution of the microbial communities of the biopiles was assessed.•Fungal and especially bacterial community experienced changes. Emerging pollutants can reach the environment through the sludge of Wastewater Treatment Plants. In this work, the use of Trametes versicolor in biopiles at lab-scale was studied, evaluating its capacity to remove the most hydrophobic Pharmaceuticals and assessing the evolution of the biopiles microbial communities. The total removal of drugs at real concentrations from sewage sludge was assessed for non-inoculated and fungal inoculated biopiles, testing if the re-inoculation of the biopiles after 22 days of treatment would improve the removal yields. It was found that 2 out of the 15 initially detected pharmaceuticals were totally degraded after 22 days, and re-inoculated fungal biopiles achieved higher removal rates than non-re-inoculated fungal biopiles for single compounds and for all the drugs simultaneously: 66.45% and 49.18% re-inoculated and non-re-inoculated biopiles, respectively. Finally, the study of the bacterial and fungal communities revealed that fungal inoculated and non-inoculated biopiles evolved to similar communities adapted to the presence of those drugs.
ISSN:0956-053X
1879-2456
DOI:10.1016/j.wasman.2017.10.048