Sri , Redjeki (2010) Reduction of The Energy Usage of Sea Water Desalination with Electrodialysis Process. In: The 1 International Seminar on Fundamental and application of chemical engineering, 3-4 Nopember 2010, Bali, Indonesia .
Abstract
Seawater desalination is a real challenging problem for Indonesia wich has large area of sea. In electrodialysis the driving force is the electric power to remove the ions from the raw water to be desalinated. For desalination of seawater with electrodialysis, the energy demand is relatively high,. because the need for electrical power is proportional to the salt content of the water. Other factors which make high energy consumption on electrodialysis process are, high electrical resistance, fouling and concentration polarization. Fouling on ED membranes caused by dissolved organic compounds in the raw water will increase resistance in membrane surface. Concentration polarisation on the surface of the membrane, will cause the electric current used at ED process to increass. The aim of the study is to reduce the energy usage on the desalination with implementation an ED process. Fouling can be reduced by pretreatment of the raw water by ultrafiltration membrane. To minimize the requirement of the electrical energy, limiting current (II,,) is used. The limiting current is the current required to transfer all the available ions. First, the research was done with a conventional process without using limiting current, as a controlling process. The best results were temperature 30°c, concentration 35,000 pprn and at rate 5 cmls, the fresh water 1000 pprn and reduced current 40-50%.
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