Potential changes in soil properties following irrigation with surfactant-rich greywater

Research output: Contribution to journalArticlepeer-review

122 Scopus citations

Abstract

The use of insufficiently treated greywater (GW) for irrigation is becoming increasingly common, a practice mistakenly considered safe. Concentrations of surfactants found in greywater effluents range from 0.7 to 70 mg L-1 and on average are higher than concentrations in raw domestic wastewater. However, there is little information regarding the environmental impact of surfactants. Pollutants such as boron, salt, and faecal coliforms are also commonly found in greywater but are not the focus of this study. The capillary rise in sand that was pre-treated with a laundry detergent solution was lower than that in sand pre-treated with fresh water, and exhibited hydrophobic properties. As with the capillary rise, a flow pattern typical of hydrophobic soil was noted when the imbibition of fresh water into sands pre-treated with laundry detergent solution was tested. It is suggested that surfactant accumulation in the soil due to greywater irrigation can create water-repellent soils, thereby affecting their flow patterns and productivity.

Original languageEnglish
Pages (from-to)348-354
Number of pages7
JournalEcological Engineering
Volume26
Issue number4
DOIs
StatePublished - 31 Jul 2006

Keywords

  • Capillary rise
  • Detergents
  • Greywater
  • Hydrophobic soils
  • Infiltration
  • Surfactant

ASJC Scopus subject areas

  • Environmental Engineering
  • Nature and Landscape Conservation
  • Management, Monitoring, Policy and Law

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