If the source water contains ...

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If the source water contains over 0.05 mg/L of oil and grease or total hydrocarbons the RO membranes will get damaged permanently and cannot be easily cleaned. If the plant is operated at source water total hydrocarbon concentration of 1 mg/L the RO membranes will be permanently destroyed within 2 to 3 hours. For costs of seawater desalination see the following publication: http://www.multi-statesalinitycoalition.com/storage/summit/2012/presVoutchkov.pptx Overall, the cost of desalinated seawater could vary between 0.5 and 3 US$/m3. The cost of desalinated brackish water could vary between 0.1 and 1.0 US$/m3