Tag: Seawater
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Depth Exposed Membrane for Water Extraction (DEMWAX™)
DXV Water Technologies has designed a novel membrane system that uses natural pressure, a very low recovery rate and gravity flow of feedwater past the membrane surface, resulting in an elegant, efficient system. Since the invention of the reverse-osmosis (RO) membrane researchers have tried to harness natural water-pressure, but past attempts mimic onshore processes with…
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Carlsbad project plan for green SWRO
The largest and most advanced seawater desalination project under development in the USA today is the 189,000 m³/d plant in Carlsbad in southern California. This project is collocated with the Encina coastal power generation station, which currently uses seawater for once-through cooling. The Carlsbad seawater desalination project is developed as a public-private partnership between Poseidon…
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San Francisco study proves impaired source still feasible
The Marin Municipal Water District (MMWD), near San Francisco, USA, has been exploring seawater desalination to provide a drought-proof supplement to its over-extended water supply. Desalination of San Francisco Bay water presents challenges for pretreatment due to the frequent changes in water quality from the ebb and flow of the tides and winds, seasonal changes…
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UF Pretreatment For Cold Seawater RO
The main obstacle to the use of UF membranes for SWRO pretreatment has always been the high operating cost. This paper describes operational experience of pilot projects using a new membrane designed for the lowest whole-life cost while enabling the most difficult seawater to be treated using membrane desalination. This article shows how the project…
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Gold Coast’s twin intake/outfall tunnels save space and environment
A key part of the anti-drought strategy in Queensland, Australia, has been the construction of a 125,000 m³/d seawater reverse-osmosis desalination plant, located at Tugun on the Gold Coast, due to start producing water in November 2008. This plant will supply up to 20% of the average demand for the Brisbane/Gold Coast Region. The Gold…
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Possibilities for energy optimisation in design and operation of SWRO plants
Seawater desalination with reverse osmosis (SWRO) has taken a noteworthy upturn during recent years. One of the reasons for the success of the membrane process is its lower energy consumption in comparison with thermal desalination processes. The high-pressure RO desalination stage is undoubtedly the dominating energy consumer of an SWRO plant. Energy consumption of SWRO,…
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Qatari research aims to
The Qatar Electricity and Water Company (QEWC) and Qatar Environment and Energy Research Institute (QEERI) have signed a Memorandum of Understanding (MoU) to develop two pilot projects that could ‘radically reduce the cost and energy use’ of desalination.
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Researchers up ante in solar desalination
Scientists at Georgia Institute of Technology and Nanjing University have developed a solar thermal desalination process based on what the researchers claimed to be low-cost and durable treated aluminium oxide sheets that focus the sun’s energy.
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Namibia considers new-build desalination
Namibia is pondering a desalination programme to address water shortages and to supply irrigation schemes that consume annually some 430 million m³ of water.
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Seawater desalination protest tide grows
Hermosa Beach has joined a “growing tide of opposition” to the West Basin Municipal Water District’s proposed US$ 300 million ocean water desalination for El Segundo according to local newspaper The Daily Breeze.