Author: Water. Desalination + reuse

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Field trials of a new scale-inhibiting chemical for use with reverse-osmosis membranes in wastewater reuse plants show that, at a low dose rate, it can increase the solubility of calcium phosphate by over one hundred times, obviating the need for using dangerous and costly acid. Current design practices for large effluent reuse projects are focused…

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…

Desalination Concentrate Disposal: Salt Production For Zero-Discharge System

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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…

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…

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…

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.…

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…

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…

Gold Coast’s twin intake/outfall tunnels save space and environment

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A key part of the anti-drought strategy in Queensland, Australia, has been the construction of a 125,000 m&sup3/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…

MBR upgrades mean less maintenance and longer life

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