Domestic wastewater (sewage) is generated from residential, institutional, commercial and industrial establishments. It includes household waste liquid from toilets, baths, showers, kitchens, sinks etc. that is disposed of via sewers. Sewage may also include stormwater runoff. As rainwater travels over roofs and the ground, it may pick up various contaminants. Sewage is the major source of water pollution in India, especially in and around large urban centres.
Sewage is mainly composed of 99.9% of water together with relatively small concentrations of suspended and dissolved organic and inorganic solids. Organic substances present in sewage are carbohydrates, lignin, fats, protein and their decomposed products, soaps as well as various natural and synthetic organic chemicals from the process industries. Ewalt’s wastewater treatment technologies can be used to provide low-cost sanitation and environmental protection while providing additional benefits from the reuse of water.