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- Title
Unprecedented system efficiency and simplicity yields exceptionally low cost of permeate in 5,000 ton/day SWRO system.
- Authors
Duncavage, David; Bly, Casey
- Abstract
The rising cost of energy has put extreme pressures on the design and operation of municipal seawater reverse osmosis (SWRO) facilities especially in localities where electricity rates are high. To meet this challenge, creative approaches to SWRO system design and energy recovery devices (ERD) selection and utilization are required. Any successful approach will have to take into consideration not only the energy transfer efficiency of the particular ERD, but its level of complexity, ease of start-up, and capital costs in order to build a system with the lowest possible specific energy consumption (SEC). This paper will describe how a 4,500m³/day municipal SWRO facility with energy costs exceeding 0.28 kH-h and an ERD supplier recently met this challenge and produced a system with a SEC of < 2.46 kW-h/m³. The first section of this paper will review three ERD technologies available on the market today: the Pelton impulse turbine; isobaric chambers; and hydraulic pressure boosters. Attention will be given to not only how their brine energy transfer efficiency is arrived at, but also to each system's level of complexity, ease of start-up and operation, and capital costs. The second section will describe the final system design including the selection of the high pressure feed pump and membrane design. The final section will review actual performance data from the facility showing how the system ran with a SEC of 2.46 kW-h/m³.
- Subjects
REVERSE osmosis in saline water conversion; REVERSE osmosis (Water purification); TURBOCHARGERS; ENERGY consumption; LIFE cycle costing
- Publication
Desalination & Water Treatment, 2013, Vol 51, Issue 4-6, p742
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2012.721235