Abstract
The Polymetrics seawater reverse osmosis (RO) facility at Ghar Lapsi, Malta, is one of the largest seawater RO plants in the world, with an installed capacity of 20,000 m 3 /d (5.3 U.S. mgd). A second plant, provided under the same contract, has a capacity of 4,500 m 3 /d (1.2 U.S. mgd), utilizing highly brakish feedwater. The plants supply potable water for the island's 350,000 residents and its growing tourist trade. The seawater plant is a single pass design, utilizing DuPont permeators and is the first major installations incorporating energy recovery turbo-pumps. This paper summarizes the plant design, manufacture, assembly, and installation, and also reports up-to-date operation and maintenance data. The operating costs are presented.
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