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Anaerobic digestion of ultrasonicated sludge at different solids concentrations - Computation of mass-energy balance and greenhouse gas emissions.

Pilli, Sridhar; Yan, Song; Tyagi, Rajeshwar Dayal; Surampalli, Rao Y. (2016). Anaerobic digestion of ultrasonicated sludge at different solids concentrations - Computation of mass-energy balance and greenhouse gas emissions. Journal of Environmental Management , vol. 166 . p. 374-386. DOI: 10.1016/j.jenvman.2015.10.041.

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Résumé

Two cases of anaerobic digestion (AD) of sludge, namely (i) with pre-treatment and (ii) without pre-treatment, were assessed using mass-energy balance and the corresponding greenhouse gas (GHG) emissions. For a digestion period of 30 days, volatile solids degradation of the control sludge and the ultrasonicated secondary sludge was 51.4% and 60.1%, respectively. Mass balance revealed that the quantity of digestate required for dewatering, transport and land application was the lowest (20.2 × 106 g dry sludge/day) for ultrasonicated secondary sludge at 31.4 g TS/L. Furthermore, for ultrasonicated secondary sludge at 31.4 g TS/L, the maximum net energy (energy output − energy input) of total dry solids (TDS) was 7.89 × 10−6 kWh/g and the energy ratio (output/input) was 1.0. GHG emissions were also reduced with an increase in the sludge solids concentration (i.e., 40.0 g TS/L < 30.0 g TS/L < 20.0 g TS/L). Ultrasonication pre-treatment proved to be efficient and beneficial for enhancing anaerobic digestion efficiency of the secondary sludge when compared to the primary and mixed sludge.

Type de document:
Mots-clés libres: pre-treatment; biodegradability anaerobic digestion; mass-energy balance and greenhouse gas emissions
Centre: Centre Eau Terre Environnement
Date de dépôt: 20 déc. 2016 16:19
Dernière modification: 20 déc. 2016 16:19
URI: http://espace.inrs.ca/id/eprint/4007

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