Two-step optimization of pressure and recovery of reverse osmosis desalination process

Shuang Liang, Cui Liu, Lianfa Song

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Driving pressure and recovery are two primary design variables of a reverse osmosis process that largely determine the total cost of seawater and brackish water desalination. A two-step optimization procedure was developed in this paper to determine the values of driving pressure and recovery that minimize the total cost of RO desalination. It was demonstrated that the optimal net driving pressure is solely determined by the electricity price and the membrane price index, which is a lumped parameter to collectively reflect membrane price, resistance, and service time. On the other hand, the optimal recovery is determined by the electricity price, initial osmotic pressure, and costs for pretreatment of raw water and handling of retentate. Concise equations were derived for the optimal net driving pressure and recovery. The depend ences of the optimal net driving pressure and recovery on the electricity price, membrane price, and costs for raw water pretreatment and retentate handling were discussed.

Original languageEnglish
Pages (from-to)3272-3277
Number of pages6
JournalEnvironmental Science and Technology
Volume43
Issue number9
DOIs
StatePublished - May 1 2009

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