Higher Institute of Engineering

Repowering and Modification of Grid Connected Reverse Osmosis Desalination Plants

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Courtesy of Higher Institute of Engineering

Currently, there is a strong demand for efficient seawater desalination plants, which can meet the tougher environment regulation and energy saving requirements. From this standpoint the present work was undertaken to include the proposed schemes for repowering and modification of Reverse Osmosis (RO) desalination plants. The model of Modified Desalination Plant (MDP) during sunny periods may be applied to the following modes of operation: Full solar desalination and Hybrid solar desalination. During cloudy periods and at night the MDP operates as a conventional grid connected RO plant. The study result shows the effectiveness of proposed schemes for modification and repowering of RO plant. For the case study (MDP with annual share of solar electrical power generation 96.3 %) the economical effect amount 143.15 ton fuel / year for each MW design thermal energy of parabolic solar collector arrays. The corresponding decrease in exhaust gases emission (Nitrogen oxides (NOx) 0.57 ton/year.MW, carbon dioxides (CO2) 448.2 ton/year.MW). Implementation of Combined RO and Multi-Effect Distillation (MED) scheme for repowering and modification of RO plant will increase the desalted water production in about 17022.9 ton/year.MW. Moreover Solar Combined RO/MED scheme has the potential of boosting water output through simple or full integration at the same time reducing the power to water ratio by 29 %.

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