Corrosion Protection for Energy Recovery in Hydro Turbines

Brackish groundwater makes up a portion of the total amount of water stored in aquifers. Brackish groundwater desalination holds promise as a water supply strategy. A small-scale hydro system usually consists of turbine, which is made to spin by jets of high velocity water. The turbine spins continuously, as long as there is water to drive it. The recovery of lost energy in RO desalination plants through hydro-turbine systems is a big aim to lower its cost and its large scale application in agriculture and irrigation fields. Mini hydro turbine could be used for energy recovery from the reject of the brackish desalination plants. The reject stream is characterized by high velocity, high pressure and high salt concentration which makes these streams very corrosive for the material of the hydro turbine. So protection of these hydro turbines against corrosion is required. Corrosion have a bad impact on humans and the surrounding environment which consumes more than 3% of the gross domestic product (GDP) of the world annually. One of the most commonly practiced techniques to prevent metals from corrosion is to apply anti-corrosive paints on their surfaces.