Use of Renewable Energy Technologies for Desalination

In: Science

Submitted By 645372567
Words 3615
Pages 15
Use of renewable energy technologies for desalination
Wang Shuxian z3452701 Abstract
Only about 0.25% of total fresh water, which is only 3% of total water in global world, could directly supply for the most needs of human beings and animals. Another significant impact is due to rapid population growth, causing severe fresh water scarcity. Other factors include rapid industrial growth, industrial wastes and sewage discharged and climate change. It would be feasible to overcome the water scarcity through seawater desalination; however, if seawater containing high salinity is converted to fresh water by desalination, it consumes large amounts of energy. Therefore, it is important to find suitable alternative energy resources for the desalination technology due to conventional fossil fuels crisis and environmental pollution.
Renewable energy is commonly alternative energy sources considered for desalination, including solar thermal energy, solar photovoltaics, wind energy, hybrid solar PV-wind energy and geothermal. Renewable energy can power the desalination systems comprising comprise the phase change processes, which include the multistage flash, multiple effect boiling and vapour compression and membrane processes, which include reverse osmosis and electrodialysis. Finally, the paper will discuss the best renewable energy powered desalination systems.
Keywords: Desalination; Renewable energy; Solar thermal energy; Solar PV energy; Wind energy; Geothermal energy

1. Introduce
Water is one of the most plenty of resources in the earth surface, covering about 70%. However, it is estimated that only about 3% (approximate 36 million km3) of that is fresh water and the other about 97% is salt water in the oceans. 70% of the total fresh water is inaccessible in the form of polar ice, and 30% is reserved in the deep underground. To make things worse, only about 0.25% of…...

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