Effluents from industries are highly polluting. Industries are a major consumer of water. While with depleting water resources they are getting more concerned for the environment, they are also redesigning their production processes to focus on treatment of effluents and the reuse of recycled water. More water is being treated and reused numerous times before partial discharge or near zero discharge.
Sewage is output from daily domestic, industrial and commercial human usage. As population and urbanization is increasing at a rapid rate governments all over the world are insisting apart from municipal plants, on decentralized sewage treatment plants for individual communities, resorts, hotels, hostels, residential and commercial complexes. Treated sewage water is reused for various secondary applications like flushing, gardening, ground water replenishment. There are a host of technologies and options available for treating sewage.