Vol. 2, Issue 10 (2015)
Laundry Wastewater Reuse in Irrigation and its Effects on Soil
Author(s): Dr. Sachin Madhavrao Kanawade
Abstract: In order to investigate the effects on soil hydrologic parameters for grey water irrigation, series of soil column (composed of several PVC rings) experiments was conducted using medium grain sand (d50=0.52mm) under water-unsaturated condition for different grey water 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 grey water with higher concentration reach the column outlet faster because of increased hydraulic conductivity. Separate experiments were conducted for surface tension reduction for different grey water concentration and found that the surface tension becomes constant when it reaches 280mg/L. This value may be considered as the critical micelle concentration (CMC) for the laundry detergent used in this study. The pressure-saturation curves obtained for different experiments shows that the reduction of capillary rise stops when the grey water concentration reaches towards the CMC value.