A review of untreated household greywater quality to inform the water saving-risk trade-off in South Africa

Interest in greywater reuse is increasing in South Africa, because of the potential to supplement scarce freshwater resources in the face of increasing demand and aridity. This paper aims to inform the water savingrisk trade-off associated with residential untreated greywater use, through a statisti...

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Vydáno v:Water S. A. Ročník 48; číslo 4; s. 441 - 449
Hlavní autoři: Nel, Nicole, Brink, Isobel, Jacobs, Heinz Erasmus, Ilemobade, Adesola
Médium: Journal Article
Jazyk:angličtina
Vydáno: Gezina Water Research Commission 01.10.2022
Témata:
African studies
Biofilms
Cost control
Data collection
Drinking water
Fresh water
Freshwater
Freshwater resources
Greywater
Households
Hygiene
Infrastructure
Inland water environment
Leaching
Piping
Public health
Risk assessment
Sewage
South African studies
Statistical analysis
Tradeoffs
Wastewater
Wastewater discharges
Wastewater treatment
Water conservation
Water discharge
Water quality
Water reuse
Water shortages
Water supply
Water treatment
South Africa
ISSN:0378-4738
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Shrnutí:Interest in greywater reuse is increasing in South Africa, because of the potential to supplement scarce freshwater resources in the face of increasing demand and aridity. This paper aims to inform the water savingrisk trade-off associated with residential untreated greywater use, through a statistical analysis of greywater quality results as sourced from prior South African studies. Greywater sources included in this review were the bathroom, kitchen, laundry, mixed and general residential sources. Variability in terms of each of the reported physical, chemical and microbiological constituents by source and between result sets was noted. Statistically significant differences were evident between the pH, conductivity and phosphorus values of certain sources. A risk assessment undertaken for each of the constituents revealed further variability. The constituent with the highest number of high-risk samples was total dissolved solids. The relatively high risk and negative consequences in greywater practices in terms of public health, the environment, and infrastructure, given this variability, provide insight into the trade-off with potential water savings. It is recommended that a more nuanced view of the potential potable savings associated with greywater reuse and also improved risk management is required by the user. KEYWORDS greywater risk quality
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ISSN:0378-4738
DOI:10.17159/wsa/2022.v4S.i4.3946