Comparative life cycle assessment of excreta management systems through composting and biomethanization: case of a low-income tropical country

Jean-Baptiste, Davidson et Monette, Frédéric. 2024. « Comparative life cycle assessment of excreta management systems through composting and biomethanization: case of a low-income tropical country ». Water Science and Technology.
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Résumé

Low-income tropical regions, such as Haiti, grapple with environmental issues stemming from inadequate sanitation infrastructure for fecal sludge management. This study scrutinizes on-site sanitation systems in these regions, evaluating their environmental impacts and pinpointing improvement opportunities. The focus is specifically on systems integrating excreta valorization through composting and/or anaerobic digestion. Each system encompasses toilet access, evacuation, and sludge treatment. A comparative life cycle assessment was undertaken, with the functional unit managing one ton of excreta in Haiti over a year. Six scenarios representing autonomous sanitation systems were devised by combining three toilet types (container-based toilets (CBTs), ventilated improved pit (VIP) latrines, and flush toilets (WC)) with two sludge treatment processes (composting and biomethanization). Biodigester-based systems exhibited 1.05 times higher sanitary impacts and 1.03 times higher ecosystem impacts than those with composters. Among toilet types, CBTs had the lowest impacts, followed by VIP latrines, with WCs having the highest impacts. On average, WC scenarios were 3.85 times more impactful than VIP latrines and 4.04 times more impactful than those with CBTs regarding human health impact. Critical variables identified include the use of toilet paper, wood shavings, greenhouse gas emissions, and construction materials.

Type de document:	Article publié dans une revue, révisé par les pairs
Professeur:	Professeur Monette, Frédéric
Affiliation:	Génie de la construction
Date de dépôt:	27 juin 2024 13:44
Dernière modification:	08 juill. 2024 18:39
URI:	https://espace2.etsmtl.ca/id/eprint/28818

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