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Carbon footprint assessment of water and wastewater treatment works in Scottish islands

Gupta, Rohit; Lee, Susan; Lui, Jade; Sloan, William T; You, Siming; (2024) Carbon footprint assessment of water and wastewater treatment works in Scottish islands. Journal of Cleaner Production , 450 , Article 141650. 10.1016/j.jclepro.2024.141650. Green open access

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Abstract

Quantifying the global warming potential of existing water infrastructure is an important step in realising the water industry's commitment to net-zero carbon. Whilst there has been an improved understanding of the global warming potential of centralized urban water infrastructure, rigorous analyses of smaller-scale rural systems are rare. This work adopts a life cycle assessment to ascertain the global warming potential of existing drinking water treatment works and wastewater treatment works associated with five Scottish islands: Arran, Iona, Jura, Barra, and Vatersay. The water systems, from source to sink, along with the use of chemicals, transportation, energy, and the reuse of waste products from water infrastructure are considered. The global warming potentials of the island's drinking water treatment works ranged from 0.18 to 0.79 kgCO2-eq/m3 of drinking water, while that for wastewater treatment works were 0.51 to 1.14 kgCO2-eq/m3 of wastewater. The global warming potential for water services on the islands can be as much as 7-times of that water services across Scotland as previously reported. Major global warming potential contributor in drinking water treatment works was the electricity consumed by the membrane bioreactors. The modelled direct emission of methane from sludge in septic tanks and for land reclamation made the largest contribution to global warming potential. It was also highly sensitive to model parameters, which highlights the need for a comprehensive exploration of process emissions from septic tanks and sludge handling. This analysis of existing rural water infrastructure is a baseline against which potential alternative low-carbon technology configurations can be compared.

Type: Article
Title: Carbon footprint assessment of water and wastewater treatment works in Scottish islands
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jclepro.2024.141650
Publisher version: http://dx.doi.org/10.1016/j.jclepro.2024.141650
Language: English
Additional information: Copyright © 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Water; Community; Islands; Global warming potential; Net zero; Life cycle assessment
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10190058
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