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University of San Francisco (2016)

What Is The Economic Feasibility Of Implementing Grey Water Infrastructure At The Citywide Level

Munoz, Natalie J.

Titre : What Is The Economic Feasibility Of Implementing Grey Water Infrastructure At The Citywide Level ?

Auteur : Munoz, Natalie J.,

Université de soutenance : University of San Francisco

Grade : Master of Science in Environmental Management (MSEM) 2016

Résumé
This paper examines the challenges and economic feasibility of implementing grey water recycling systems at a citywide scale. Past and present conditions of fresh water scarcity are discussed, and how scarcity will be exacerbated by climate change. Previous technological developments and initiatives are discussed, and how they are implemented to reduce fresh water scarcity. Challenges, examples and costs of implementing grey water systems are detailed ; in general results indicate that large projects (such as apartment complexes and multistory buildings) are only economically feasible (as opposed to single-family homes), decentralized (on-site) systems also appear to be more economically feasible due to cost savings of energy and piping required to convey grey water and waste water for treatment and installing a grey water system in new construction is less costly than retrofitting a building. Additional costs associated with determining the economic feasibility of grey water systems are nuanced, for example water rates make a large difference on the payback period of the project and lifestyle of the occupant (differing water amount and detergent uses). The average project cost ranged from $447,289 to $4,411, payback period ranged from 10-16 years and only a positive Net Present Value (NPV) was determined for a multistory building. For a city such as San Francisco, implementing grey water systems in single-family homes and multistory buildings would cost approximately $1.8 billion dollars

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Page publiée le 13 novembre 2016, mise à jour le 1er avril 2019