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Field study of the composition of greywater and comparison of microbiological indicators of water quality in on-site systems

  • Margaret Leonard
  • Brent Gilpin
  • Beth Robson
  • Katrina Wall
Article

Abstract

Thirty on-site greywater systems were sampled to determine greywater characteristics and practices in the field. Kitchen greywater was present at eight sites and urine was included at seven sites. These non-traditional sources resulted in significantly higher concentrations of enterococci and 5-day biochemical oxygen demand (BOD5) in greywater. Even with the removal of these sources, the concentrations of microbial indicators indicated high levels of contamination could occur across all greywater sources, including “light” greywater. Using multiple microbial indicators showed that all samples had the potential for faecal contamination. Bacteroidales markers were confirmed in treated greywater and in each greywater source, highlighting the potential for human faecal contamination. Although Escherichia coli was absent in treated greywater recycled to the house, other microbial indicators were present; hence, caution is required in using E. coli concentrations as the sole indicator of microbiological water quality. High BOD5 or total suspended solid concentrations exceeded the levels recommended for effective disinfection. Subsurface irrigation, which is assumed to provide a five-log reduction in exposure, is a suitable reuse option for non-disinfected greywater. Only half the occupants had a good understanding of their greywater systems and 25 % of systems were poorly maintained. Elevated microbial indicator contamination of greywater sludge is a potential hazard during maintenance.

Keywords

Greywater Microbial indicators Water reuse Treatment 

Notes

Acknowledgements

This work was funded by the New Zealand Ministry of Health. Site identification and sampling has been possible through the generous assistance of industry, local authorities and members of the public. We would like to thank Heather Kikkert and Alex Skinner for sampling and analyses, and ESR’s Christchurch public health laboratory for analyses. Finally, we are grateful to our colleagues for their helpful comments.

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Copyright information

© Crown Copyright 2016

Authors and Affiliations

  1. 1.Ara Institute of CanterburyChristchurchNew Zealand
  2. 2.Institute of Environmental Science and ResearchChristchurchNew Zealand
  3. 3.Health Protection NSWNorth SydneyAustralia

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