Greywater reuse for toilet flushing at a university academic and residential building

Interest in water reuse is increasing all over the world and particularly in South Africa, because of its potential to supple- ment scarce freshwater resources in the face of increased demand and aridity. If water reuse is to be implemented, it must be done sustainably. This study: (i) describes the...

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Bibliographic Details
Published in:Water S. A. 2013-01, Vol.39 (3), p.351-351
Main Authors: Ilemobade, AA, Olanrewaju, OO, Griffioen, ML
Format: Article
Language:English
Subjects:
Colour
Economic analysis
Flushing
Freshwater resources
Greywater
Irrigation
Perception
Residential areas
Residential buildings
Reuse
Smell
Toilet facilities
Toilets
University buildings
Water reuse
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Summary:Interest in water reuse is increasing all over the world and particularly in South Africa, because of its potential to supple- ment scarce freshwater resources in the face of increased demand and aridity. If water reuse is to be implemented, it must be done sustainably. This study: (i) describes the perceptions of beneficiaries before and after greywater reuse (GWR) imple- mentation; (ii) determines the attributes of greywater that were important to beneficiaries when reusing greywater and their willingness to pay for these attributes; and (iii) undertakes an economic analysis of the implemented GWR systems. To this end, two GWR systems for toilet flushing were installed. The first was installed at a university academic building at the University of the Witwatersrand, Johannesburg, and the second at a university residence at the University of Johannesburg. Perceptions highlighted included respondents' preference to reuse greywater for toilet flushing rather than irrigation, and the greater preference for GWR for toilet flushing expressed for the university academic relative to the university residential building. In sequence, 'smell', colour' and 'greywater tariff' emerged as the attributes of greywater that were important to respondents. In terms of payback period, net present value and benefit-cost ratio, both systems generated a net loss and were economically unfeasible. [PUBLICATION ABSTRACT]
ISSN:0378-4738
0378-4738
DOI:10.4314/wsa.v39i3.2