Associate Professor & Head Priyadarshini J.L. College of Engg., 846 New Nandanvan, Nagpur (India)

Water is becoming a rare resource in the world. In India alone the International Water Management Institute (IWMI) predicts that by 2025, one person in three will live in conditions of absolute water scarcity (IWMI, 2003)(1). It is therefore essential to reduce surface and ground water use in all sectors of consumption, to substitute fresh water with
alternative water resources and to optimize water use efficiency through reuse options. This alternative. Resources include rainwater and grey water .Grey water is all wastewater that is discharged from a house, excluding backwater (toilet water). This includes water from showers, bathtubs, sinks, kitchen, dishwashers, laundry tubs, and washing machines. It commonly contains soap, shampoo, and toothpaste, food scraps, cooking oils, detergents and hair. Typically, 50-80% of the household wastewater is grey water. If a composting toilet is also used, then 100% of the household wastewater is grey water. Reusing grey water serves two purposes: it reduces the amount of freshwater needed to supply and reduces the amount of waste water entering sewer or septic systems.