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Water and Wastes Digest Archive

Membrane Technology Aug 2011
Unlike dissolving table salt in water, removing salts from water  pays the cost for going against nature. Laws of nature govern the chemical phenomenon of osmosis—the natural movement of pure water from an area of low solute concentration, through a...
Mesa Consolidated Water District (MCWD) was formed on Jan. 1, 1960, to manage and deliver water and water-related services to customers within its 18-sq-mile service area in Orange County, Calif. In the late 1990s, MCWD constructed the Colored Water...
Laboratory trials and small- and large-scale external pilot trials have shown promising results for the future of reverse osmosis (RO) membranes treating brackish water. Recent technological developments improve fouling resistance and salt rejection in...
The compact footprint of many membrane systems is a big advantage for a growing number of water treatment installations. Many municipalities are struggling to increase water treatment capacity to keep up with rising populations, but often they cannot...
Much of my current workload concerns projects with reverse osmosis (RO) as an integral component for makeup water treatment and/or a pre-concentrator for zero-liquid discharge. RO has become the heart of many water treatment systems, either as a retrofit...
A power plant in the Southwest recently was required to move to zero liquid discharge (ZLD) because the existing land it used for disposal—via spray irrigation—no longer would be available. The Department of Transportation had decided to build a highway...
The city of Santa Paula, Calif., recently completed construction of the first water recycling facility built under California Government Code 5956 to encourage private investment aiding in solving public infrastructure needs. The city selected the PERC...
Membranes are not install-and-forget solutions. These investments warrant consistent, specialized monitoring and maintenance. And given the proper care, they are likely to return the favor with full-power performance over a long lifetime. Much like...

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