Economic and Reliability Assessment of Hybrid PRO-RO Desalination Systems Using Brine for Salinity Gradient Energy Production

Ewaoche John Okampo, Nnamdi Nwulu and Pitshou N. Bokoro
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Ewaoche John Okampo: Department of Electrical and Electronic Engineering Technology, University of Johannesburg, Johannesburg 2092, South Africa
Nnamdi Nwulu: Department of Electrical and Electronic Engineering Science, University of Johannesburg, Johannesburg 2092, South Africa
Pitshou N. Bokoro: Department of Electrical and Electronic Engineering Technology, University of Johannesburg, Johannesburg 2092, South Africa

Sustainability, 2022, vol. 14, issue 6, 1-16

Abstract: The energy requirements for desalination have made it an expensive process, however, it is still a viable and cost-effective means of water purification amidst freshwater scarcity. The management and disposal of brine is an external and extra desalination cost due to the effect of brine on the environment. The integration of Pressure Retarded Osmosis (PRO) with the Reverse Osmosis (RO) technique as modelled in this paper enhances brine management. The brine is fed back into the PRO unit to create a salinity gradient for water transfer via membrane and generate salinity gradient energy. The hybrid desalination model is designed to be powered by grid-tied offshore wind power. The use of wind power, a clean, renewable energy source devoid of carbon emission, as the main power source to drive the RO unit reduces the cost and effect of carbon emissions from the grid. The proposed model is assessed using Levelized cost of energy (LCOE), Annualized cost of the system (ACS), and cost of water (COW) as economic matrices. In contrast, loss of energy probability is used as a reliability matrix. Obtained results show a LCOE of 1.11 $/kW, ACW of $110,456, COW of 0.13 $/m 3 , loss of energy probability of 0.341, a low total carbon emissions of 193,323 kgCO 2-e , and zero brine production. Results show that the proposed model is economically viable, technically reliable, environmentally friendly, and generally sustainable.

Keywords: renewable energy; salinity gradient energy; wind energy; pressure retarded osmosis; reverse osmosis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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