Category: Desalination

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Since large-scale desalination started, the question of how to dispose of the reject material produced by the process has occupied the minds of engineers and economists. The quantity of brine discharged from desalination plants is increasing, and this trend will be maintained for the near future. The minerals extracted must have a value, but how…

Advantages of Polyethersulfone (PESU) membranes for pretreatment for SWRO applications

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Membrane pretreatment for large-scale seawater desalination has grown rapidly in the last few years. Existing examples seem to show that the additional cost can be more than recouped in reduced chemical costs alone, but there are also environmental advantages. This article is the first of two discussing the advantages of polyethersulfone (PESU) membranes for filtration…

Boron nitride nanotube membranes outstrip carbon copies

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One approach to improve the desalination process would be to design a more efficient membrane. Embedding nanotubes in the membrane is one area of research. Investigation of water transport through nanotubes in the past has primarily focused on carbon nanotubes, where the water has been found to flow extraordinarily fast in addition to rejecting salt…

Large Diameter RO Desalination Elements

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In recent years, increasing the diameter of spiral elements has been studied as a method of lowering the cost of membrane treatment. It has been shown that the installed cost of a reverse osmosis (RO) plant can be reduced by up to 27% using larger diameter elements.Large diameter elements provide savings in footprint and building…

The coming of membrane distillation technology

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Membrane distillation (MD) is a unit operation that uses hydrophobic membranes as a barrier for contaminated water from which mass transport of vapor is driven by differences in vapor pressure. MD does not require a mechanical pressure pump, and temperature levels are such that low-grade heat sources may be used to supply the required energy…

Trekkopje SWRO opened at Namibian uranium mine

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The 55,000 m /d Trekkopje seawater desalination plant in Nambia was opened on 16 April 2010 in the presence of Namibia’s minister of agriculture, water and forestry, John Mutorwa, and former president, Same Nujom. Designed and constructed by Keyplan, a South African specialist water treatment subsidiary of the Aveng Group, the Trekkopje seawater reverse-osmosis plant,…

South Florida embraces desalination and water reuse for the future

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The days of limitless and cheap water in South Florida are gone. Planning, investments in alternative water sources such as desalination and reuse, and conservation are required to secure reliability and sustainability of current and future water supplies. The South Florida Water Management District (SFWMD) is the oldest and largest of the five districts in…

Perth provides world desalination sustainability model

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As the USA finally starts its second large SWRO plant at Carlsbad, Australia is already into a second generation, with contracts let for the Southern Seawater desalination plant, the second to serve the Perth region. The author has for many years been a strong advocate of desalination and has promoted the technology around the world.…

KMS supplies first large-diameter SWRO system

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The port facilities for Chile’s Minera Esperanza copper/gold mine will soon be provided with drinking water from an innovative new seawater reverse-osmosis (SWRO) system supplied by Koch Membrane Systems (KMS). The system is the first full-scale large-diameter membrane RO system for seawater that KMS has developed. The system uses KMS MegaMagnum high capacity seawater membranes,…

ADC baselines SWRO desalination system performance

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