Category: Desalination

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Membrane distillation (MD) is a thermally driven membrane separation process that involves evaporation of volatile constituents (water in desalination applications) through a hydrophobic, microporous membrane. The vacuum-enhanced MD process recently patented by researchers at the University of Nevada, Reno in the United States has now been coupled with some equally interesting research at the university…

New recovery technologies can minimize concentrate volumes

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Several emerging technologies show potential to enhance recovery rates during desalination of brackish water. These processes include emerging approaches for concentrate treatment and new desalination technologies. Emerging concentrate treatment technologies that aim to enhance recovery and thus minimize concentrate include physical-chemical or biological treatment of concentrate followed by further reverse-osmosis (RO) treatment; new RO methods…

Leveraging nanotechnology for next generation seawater desalination

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in Desalination, Water reuse

NanoH2O advanced membranes for reverse osmosis (RO) desalination represent a new material that enhances current polymer-based membranes with the benefits of nanotechnology. These nanocomposite RO membranes represent a step-change in productivity through improved permeability while maintaining requisite salt and contaminant rejection. Since the original publication of this concept, further development and optimization of this membrane…

Navajo powerplant could be key to Sandoval BWRO

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A Navajo tribal enterprise to colocate a gas-fired power plant could be a key element of a proposed desalination plant for brackish groundwater in New Mexico, USA. The plant is also looking at an annual revenue of US$ 4.6 million from selling waste residuals. The commissioners of Sandoval County gave approval for design work to…

Low-pressure valves for desalination: time for a new look at the butterfly?

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Across the entire water industry spectrum, valves are an essential element in the treatment of water and in its supply. The subject of butterfly valve technology and its suitability for desalination plants is one particular aspect that rightly demands attention, particularly in respect of specifying materials that will withstand corrosion. The centred-disc butterfly valve is…

Combining Forward Osmosis with Reverse Osmosis

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A combination of forward osmosis with reverse osmosis could facilitate the treatment of some high fouling wastewaters. The system uses brine to draw water from the wastewater without high pressure or turbulence. Key element is the membrane’s ability to allow rapid passage of water without much internal concentration polarization. The diluted draw solution can then…

Desalination must pay more attention to solar energy

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The day is coming when membrane technologies for hitherto unthinkable purposes, such as rural water supply in Africa, will be competitive with the ever more difficult search for conventional supplies. The key element is energy, and these authors argue that renewable energy from the sun is not being given enough attention by governments, developers and…

Korea puts $170m into desalination SWRO and water reuse

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The Republic of Korea has recently funded a six-year US$ 170 million research initiative in seawater desalination. Over 500 researchers from 16 universities will contribute to the work of the 50-member core team. Government leaders funded the research initiative in part due to the success of South Korean multinational firms in the desalination export sector.…

Depth Exposed Membrane for Water Extraction (DEMWAX™)

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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…

Going private is recipe for BWA’s exceptional growth

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