Water. Desalination + reuse
Issue link: https://fhpublishing.uberflip.com/i/1085636
GUJARAT • State has access to only eight of India's 185 rivers • Is implementing new Reuse of Treated Waste Water Policy • Wants to double existing wastewater treatment to 5 million m3/d by 2020 Gujarat has initiated one of India's most ambitious pro- grammes to develop alternative water sources. The state, India's sixth largest by area and ninth by population, is severely water stressed. It connects to only eight of India's 185 perennial rivers. Most of its surface water is in the central and southern areas. In May 2018, it became the rst state in India to describe how it would meet national gov- ernment targets for reusing 100 per cent of treated wastewater by 2030. The Reuse of Treated Waste Water Policy mandates that all power plants and large indus- try within 50 kilometres of a sewage treatment plant must use recycled wastewater. And it sets long-term wastewater reuse targets of 70 per cent by 2025 and 100 per cent by 2030. The aim is to relieve the burden on groundwater and surface water MAHARASHTRA • Rapid expansion of water reuse in state is expected within a short time-frame • Black & Veatch strategic masterplan for water reuse in Mumbai • City of Nagpur driving towards 90 per cent water reuse India's most urbanised state has been criticised in the past for allowing untreated or inadequately treated sewage to pollute fresh water reserves. But a clean up of historic propor- tions could result from a new state-wide policy which requires municipalities to recycle and reuse treated wastewater to cool thermal power stations, serve industrial estates and meet other non-potable uses. In an initial phase, the ruling requires 71 municipal authorities to scope out and commission new tertiary treatment plants with enough capacity to reuse at least 6.9 mil- lion m3/d of sewage by 2020. The rst of these is expected to be a 40,000 m3/d plant set up by the Navi Mumbai civic body to supply water to industrial areas in Vashi, Airoli, and Koparkhairane. It would allow fresh water reserves to be diverted to villages in the nearby Kalyan Dombivali municipality. Another 70,000 m3/d treatment plant is proposed in Solapur, to provide cooling water for a thermal power plant. A third 40,000 m3/d plant is planned in Chandrapur. The city of Mumbai wants to maximise use of tertiary treated e– uent over the next 50 years. To this end, Brihanmumbai Municipal Corporation has contracted engineering and con- sulting rm Black & Veatch to prepare a detailed strategic mas- terplan for recycled water. This project foresees reuse of tertiary treated e– uent from all seven of Mumbai's wastewater treatment plants. The appointment came resources, including on Nar- mada River. Gujarat wants to double exist- ing water treatment capacity to 5 million m3/d by 2020. There are plans for a subterranean drainage collection network and 161 new wastewater treatment plants (up from 52 at present). The state is pushing bounda- ries in its approaches to waste- water recycling. "Gujarat has successfully pioneered build and operate projects whereby a de- veloper purchases sewage from the municipality, recycles it at a treatment facility, then supplies the water to a nearby industrial cluster. One project in Surat takes sewage from residential areas and pumps the clean water to a large industrial and dia- mond trade cluster," says Earth Water Group chief operating oŸ cer Hariharan Subramaniam. In November 2018, Gujarat went public with ambitions to build six 100,000 m3/d SWROs. The rst, at Jodiya in Jamnagar district, will be built for INR 10 billion ($140 million) under a public-private partnership between Gujarat Water Infra- structure Limited and Essel Infraprojects. The project is using technology from Abengoa. The concession period is 25 years and the plant is expected to become operational by 2022. Tenders for similar plants in the coastal districts of Porbandar, Drawka, Veraval and Ghogha in Bhavnagar are expected soon. Gujarat new wastewater reuse policy is aimed at reducing extractions from natural resources such as the Narmada River Black & Veatch has prepared a masterplan for water reuse in Mumbai, capital of Maharashtra and India's most populous city 20 In Site March 2019 Water. desalination + reuse