Enhancement of waste activated sludge (WAS) anaerobic digestion by means of pre- and intermediate treatments. Technical and economic analysis at a full-scale WWTP

Anaerobic digestion (AD) is the most commonly applied end-treatment for the excess of waste activated sludge (WAS) generated in biological wastewater treatment processes. The efficacy of different typologies of pre-treatments in liberating intra-cellular organic substances and make them more usable...

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Bibliographic Details
Published in:Journal of environmental management 2018-06, Vol.216, p.372-382
Main Authors: Campo, Giuseppe, Cerutti, Alberto, Zanetti, Mariachiara, Scibilia, Gerardo, Lorenzi, Eugenio, Ruffino, Barbara
Format: Article
Language:English
Subjects:
Cellular lysis
Cost-benefit assessment
Intermediate hydrolysis treatment
Two-stage anaerobic digestion
Waste activated sludge (WAS)
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Summary:Anaerobic digestion (AD) is the most commonly applied end-treatment for the excess of waste activated sludge (WAS) generated in biological wastewater treatment processes. The efficacy of different typologies of pre-treatments in liberating intra-cellular organic substances and make them more usable for AD was demonstrated in several studies. However, the production of new extracellular polymeric substances (EPSs) that occur during an AD process, due to microbial metabolism, self-protective reactions and cell lysis, partially neutralizes the benefit of pre-treatments. The efficacy of post- and inter-stage treatments is currently under consideration to overcome the problems due to this unavoidable byproduct. This work compares three scenarios in which low-temperature (
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2017.05.025