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Phosphorus as a limiting factor on sustainable greywater irrigation

journal contribution
posted on 06.12.2017, 00:00 authored by R Turner, G Will, L Dawes, Edward GardnerEdward Gardner, D Lyons
Water reuse through greywater irrigation has been adopted worldwide and has been proposed as a potentialsustainable solution to increasedwater demands. Despite widespread adoption, there is limited domestic knowledgeof greywater reuse. There is no pressure to produce low-level phosphorus products and current guidelinesand legislation, such as those in Australia,may be inadequate due to the lack of long-termdata to provide a soundscientific basis. Research has clearly identified phosphorus as a potential environmental risk to waterways frommany forms of irrigation. To assess the sustainability of greywater irrigation, this study compared four residentiallots that had been irrigated with greywater for four years and adjacent non-irrigated lots that acted as controls.Each lot was monitored for the volume of greywater applied and selected physic-chemicalwater quality parametersand soil chemistry profiles were analysed. The non-irrigated soil profiles showed low levels of phosphorusand were used as controls. The Mechlich3 Phosphorus ratio (M3PSR) and Phosphate Environmental Risk Index(PERI) were used to determine the environmental risk of phosphorus leaching from the irrigated soils. Soilphosphorus concentrations were compared to theoretical greywater irrigation loadings. The measured phosphorussoil concentrations and the estimated greywater loadings were of similar magnitude. Sustainable greywaterreuse is possible; however incorrect use and/or lack of understanding of howhousehold products affect greywatercan result in phosphorus posing a significant risk to the environment.

Funding

Category 2 - Other Public Sector Grants Category

History

Issue

456-457

Start Page

287

End Page

298

Number of Pages

12

eISSN

1879-1026

ISSN

0048-9697

Location

Netherlands

Publisher

Elsevier

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Department of Science, Information Technology, Innovation and the Arts; Higher Education Division (2013- ); Institute for Resource Industries and Sustainability (IRIS); Queensland University of Technology;

Era Eligible

Yes

Journal

Science of the total environment.