Wind Energy Based Reverse Osmosis System for Desalination of Brackish Water
The development of Renewable energy based desalination systems is important on islands and in the coastal
areas. This paper presents design of such system proposed to be located at Devgad which is one of the potential sites vetted
by National Institute of Wind Energy (NIWE) for wind energy project in the coastal region of Maharashtra. Most past
studies of wind powered desalination used the wind power indirectly that is it was used to generate electricity first and then
the electricity was used for desalination by RO process. In this work wind energy is used directly to raise the feed water
pressure for RO desalination. It involves less energy conversion and thus higher efficiency. Thebrackish water desalination
system presented here comprises of 10 kW wind turbine which converts wind energy directly into pressure energy.The
system can produce freshwater at total dissolved solids (TDS) of less than 100 mg/l from brackish water up to 10,000 mg/l of
total dissolved solids (TDS). The rated maximum capacity of plant is 31.26m3/day of clean water at average wind velocity
5.81m/s. The recovery rate of RO unit is about 40 to 50 percent. The pre-treated seawater passing through the Reverse
Osmosis (RO) membrane is separated into clean water and brine. The brine from RO has a high pressure that has been
reused to pressurize the feed water using pressure exchanger, which significantly reduces power consumption of the system.
The design procedure developed in the present study may be adopted for systems working under similar conditions.
Keywords - Renewable energy, Desalination, Wind energy, Reverse osmosis, and Pressureexchanger.