Comparative design of plug and recirculation RO systems; thermoeconomic: Case study

Mohammadreza Khanarmuei, Hossein Ahmadisedigh, Iman Ebrahimi, Louis Gosselin and Hamid Mokhtari

Energy, 2017, vol. 121, issue C, 205-219

Abstract: The main objective of this article is to determine which arrangement between the plug and recirculation reverse osmosis (RRO) is the optimal reverse osmosis (RO) system for a specific test case. Another objective is to compare the optimal operating conditions of these two arrangements. The RO system is designed to supply a water mass flow rate of 4000 m3/day for a 20-years period from Caspian Sea's brackish water to the city of Miarkelar, Iran. A multi-objective genetic algorithm is used to determine the best design of both arrangements of RO systems. Hence, feed water pressure, recirculated water flow rate, sea water membrane types, feed water flow rate and the number of elements in each pressure vessel were optimized. The objective function were the recovery rate and the unit production cost. Considering the optimal state of each arrangement, an exergy analysis has been performed. An exergy efficiency of recirculating and plug systems of 82.6% and 92.4% were obtained respectively. The thermo-economic analysis demonstrates that RRO results in a 36% decline in investment cost, 2% increase in operation cost, 6% recovery rate increment, and 19.7% permeate salt content decrease compared to the plug RO arrangement.

Keywords: Recirculating reverse osmosis; Plug RO; Genetic algorithm; Exergy efficiency (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:121:y:2017:i:c:p:205-219

DOI: 10.1016/j.energy.2017.01.028

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