Volume No. 5 Issue No.: 4 Page No.: 863-870 April-June 2011

 

EFFECT OF LAUNDRY GREYWATER IRRIGATION ON SOIL PROPERTIES

 

A. H. M. Faisal Anwar

Department of Civil Engineering, Curtin University (AUSTRALIA)

 

Received on : Feburary 25, 2011

 

ABSTRACT

 

In this study, surfactant-rich laundry greywater is used to investigate the changes of different soil properties such as, hydraulic conductivity, pH, Electrical Conductivity (EC) and pressure-saturation relationship. A series of soil column (composed of several PVC rings) experiments was conducted under unsaturated condition for different greywater concentration. In each experiment, pH, EC and hydraulic conductivity were measured. At the end of each experiment, the column was dismantled and moisture content in each ring was measured gravimetrically and the soil suction in each ring was measured from the reference groundwater table. The breakthrough curves with EC value and the measured value of pH at the column outlet revealed that the greywater with higher concentration reach the column outlet faster because of increased hydraulic conductivity. In separate experiments, soil hydraulic conductivity was tested and found steadily increasing with greywater concentration. Pressure saturation curves showed that the capillary rise decreases sharply with greywater concentration due to the reduction of surface tension but remain constant after certain concentration which may be referred to the Critical Micelle Concentration (CMC) of surfactants contained in the laundry detergents.

 

Keywords : Greywater, Soil, Irrigation, Surfactant, Properties

 

 

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