Performance analysis of two-stage pressure retarded osmosis

• Main Authors: Amornraksa Suksun, Youyen Kanokporn, Simasatitkul Lida
• Format: Article
• Language: English
• Published: EDP Sciences 2021-01-01
• Series: E3S Web of Conferences
• Subjects: two-stage pressure retarded osmosis; power density; water utilization; performance analysis; modelling
• Online Access: https://www.e3s-conferences.org/articles/e3sconf/pdf/2021/78/e3sconf_ri2c2021_01012.pdf

The performance of a two-stage pressure retarded osmosis (PRO) for power generation with a total membrane length of 1 meter was investigated and analyzed in this work. Two feed configurations of freshwater and seawater were studied: one with the freshwater entering at the first stage only and the other with freshwater entering at both stages. The effect of membrane length and flow ratio between freshwater and seawater on the PRO performance were also examined. The results revealed that the performances of both feed configurations were quite similar. The membrane with a shorter length offered a higher average power density than that of a longer length. It was also revealed that the flow ratio had a strong influence on the average power density produced. The maximum average power density of 10.15 W/m2 was obtained at the applied hydraulic pressure of 12 bar, the flow ratio of 5, and the membrane length of both stages of 0.5 meter. The best water utilization was achieved at 65%.