Dual stage PRO process for power generation from different feed resources

Ali Altaee, Adel Sharif, Guillermo Zaragoza, Nidal Hilal

    Research output: Contribution to journalArticle

    Abstract

    A dual stage PRO process is proposed here for power generation using osmotic energy. The process is able to handle a wide range of feed water salinities with different pretreatment requirements in order to reduce the membrane fouling problems. In the current study, the salinity gradient resource consisted of seawater at standard TDS, 35. g/L, while the first stage feed water was brackish water or fresh water and the second stage feed water was wastewater effluent. The diluted seawater from the first stage of PRO process was the draw solution in the second stage of PRO process. The performance of dual stage PRO process was evaluated for a number of brackish water salinities ranged from 1. g/L to 5. g/L. The TDS of wastewater and freshwater was assumed 0.2. g/L. The results showed that a better PRO performance was achieved when the brackish water and the wastewater were introduced in the first stage and the second stage respectively. In case when wastewater and brackish water were introduced in the first and second stage respectively there was about 28% decrease in the second stage permeate flow. The results also showed a decrease in the first stage permeate flow with increasing the feed salinity but the second stage permeate flow increased with increasing the feed salinity. Furthermore the results showed that the first stage maximum power density was achieved at δP=. δπ/2 while the second stage maximum power density was achieved at δP=. δπ/1.5. Unlike the conventional PRO process, it has been found that the impact of feed salinity increase on the performance of dual stage PRO process was insignificant. Finally, the power generation in the dual stage PRO process was higher than that in the conventional PRO process. The difference was equal to the entire amount of power generated in the second stage of PRO process.

    Original languageEnglish (US)
    Pages (from-to)118-127
    Number of pages10
    JournalDesalination
    Volume352
    DOIs
    StatePublished - Sep 7 2014

    Fingerprint

    brackish water
    power generation
    Power generation
    Wastewater
    salinity
    wastewater
    Water
    resource
    Seawater
    seawater
    Membrane fouling
    fouling
    water
    Effluents
    effluent
    membrane
    Saline Waters
    energy
    water salinity
    tyramine-deoxysorbitol

    Keywords

    • Dual stage PRO process
    • High performance PRO process
    • Osmotic energy
    • Pressure retarded osmosis
    • Renewable energy

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Materials Science(all)
    • Water Science and Technology
    • Mechanical Engineering

    Cite this

    Dual stage PRO process for power generation from different feed resources. / Altaee, Ali; Sharif, Adel; Zaragoza, Guillermo; Hilal, Nidal.

    In: Desalination, Vol. 352, 07.09.2014, p. 118-127.

    Research output: Contribution to journalArticle

    Altaee, Ali ; Sharif, Adel ; Zaragoza, Guillermo ; Hilal, Nidal. / Dual stage PRO process for power generation from different feed resources. In: Desalination. 2014 ; Vol. 352. pp. 118-127.
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