Category: Desalination

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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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The Chief Operating Officer of a company, who found life under a corporate umbrella was holding back its growth, explains how the senior management took the company private and watched it grow by over 50% in two years. Robin Wiseman spoke to the president and COO of BWA Water Additives, Paul Turgeon. This article first…

Experience of ten years running the Okinawa desalination plant

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At its inception, in February 1995, the Okinawa seawater reverse-osmosis (SWRO) desalination plant in southern Japan was the most advanced of its type. In March 1997, the plant’s full capacity of 40,000 m /d was completed and began full operation. Now, the desalination plant is an essential water-supply facility for Okinawa. For this reason, looking…

UF Pretreatment For Cold Seawater RO

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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…

Southern California study identifies brine-concentrate issues

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The Southern California Regional Brine-Concentrate Management Study is a collaboration between the US Bureau of Reclamation and 14 local and state agency partners, who together form the Brine Executive Management Team. The team identified the management of brine-concentrate from desalination and other water treatment processes as significant in addressing southern California’s water supply reliability. As…

Sydney’s SWRO desalination project – working towards sustainability

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Sydney’s desalination project will produce 250,000 m /d of drinking water, which equates to approximately 15% of Sydney’s supply. Sydney is currently solely reliant on surrounding dams for water. Seawater desalination will form a supplementary water source with water from the plant directly injected into Sydney’s drinking water network. In planning for the plant, Sydney…

Possibilities for energy optimisation in design and operation of SWRO plants

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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,…

MEDVSA: a methodology for design of brine discharges into seawater

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