Water Purification, Harvesting, Etc. 
Posted: 03 November 2008 10:00 AM   [ Ignore ]
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Great Wiki on Water Purification:
http://www.akvo.org/wiki/index.php/Main_Page

“Greywater Guerillas” - the story of a Californian struggle to get plumbing codes to stop making sustainable design illegal, ffs:
http://www.worldchanging.com/archives/008926.html

The Watercone—solar portable water purification:
http://www.watercone.com/index.html

Large-Scale corporate/factory solutions - corporate page w/schematics:
http://www.bioremediation.net/water_technologies.html

Bioremediation overview—detailed but awkward and spambloggish:
http://www.ids-environment.com/environment/europe/living_water/ecological_water_problems/87_0/b_supplier.html

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Posted: 02 December 2008 08:42 PM   [ Ignore ]   [ # 1 ]
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Finally, someone was graciouos enough to explain the “Water from Air” process in King’s Englishish:
http://www.sciperio.com/watertech/water-from-air.asp

“Under DARPA funding, the proposed work at Sciperio, Mechatronic Solutions Inc and Spectra Watermakers seeks to develop a new approach for harvesting potable water from the air. The system being developed is based on the application of liquid desiccant and advanced energy recovery RO technologies. It provides clear energy efficiency advantages over current state-of-the-art water-from-air systems, and can be used to produce water under ambient air conditions (e.g., hot and dry) in which current systems are incapable of producing condensed water from air.

For purposes of water harvesting, we are using liquid desiccants to absorb water vapor from the air. Liquid desiccants have at least two major advantages over conventional solid desiccants:

1. Liquid desiccants have significantly smaller absorption-evaporation cycle hysteresis characteristics than the adsorption-desorption cycle of conventional solid desiccants. This means that the energy losses per hydration-dehydration process cycle are smaller for liquid desiccants than they are for typical solid desiccants. A water-from-air system based on the application of liquid desiccants is inherently more energy efficient than a system based on conventional solid desiccant surfaces.

2. Liquid desiccants have a much higher relative water mass uptake capacity than conventional solid desiccants. Upon dissolution, for example, a LiCl ion pair generates two hydration shells comprised of a total of 26 water molecules (e.g., 26 moles of water per molar equivalent of dissolved solute). Only a few water molecules may be condensed and held within a traditional solid desiccant crystallite. As a result, liquid desiccants exhibit a 15-100 fold mass uptake advantage over traditional solid desiccants as shown in the figure below. This means that liquid desiccant-based water-from-air systems, in principle, will be lighter and more compact than comparable systems based on traditional solid state adsorbents.

3. Hygroscopic salts, like LiCl, make excellent liquid desiccants. The free energy of hydration, ∆G hyd, is so large for such salts that, upon exposure to typical ambient room air, they dissolve in their own waters of hydration. Figure 5 represents a timed-sequence series of photographs, shot at Sciperio, showing the dissolution of solid LiCl crystals and the formation of a desiccant solution due to water vapor extraction from a flowing air stream (70 oF / 50% RH, 0.5 standard L/min flow rate):

solid_licl_crystals_small.jpg

Potable water is produced by extracting solvent water from the desiccant solution, which is achieved in the proposed system through the use of an evaporation/condensation cycle The primary functional elements of the Evaporator/Condenser Module being built are

* liquid desiccant reservoir;
* closed loop scavenger air plenum;
* an air-to-liquid water vapor mass exchanger;
* a heat exchanger / water vapor condenser stage;
* a heat pump which is used to heat liquid desiccant in the evaporator stage and cool water vapor in the condenser stage; and
* a produced water collection reservoir.

Simply put, the key advantage of a liquid desiccant cooling system (versus a pure refrigeration-type) lies in the fact that water vapor may be extracted from the process air stream without first removing the sensible heat. Liquid desiccant cooling systems are beginning to become popular for humidity control and HVAC applications in the US and internationally because it is only the latent heat of vaporization for condensed/extracted water that must be managed. We are applying the application of proven liquid desiccant technology to the challenge of energy-efficient water harvesting from air. As with building air-handling applications, this approach has the immediate advantage of eliminating the need to remove sensible heat from a process air stream.

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Posted: 07 December 2008 11:55 AM   [ Ignore ]   [ # 2 ]
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http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/12/05/HOTB14967B.DTL&hw=dolman&sn=001&sc=1000

At home, Bouley has installed a permeable driveway, a rain garden, and a cistern and rain barrels that together harvest 1,000 gallons of rainwater off the roof of a shed. She uses it to irrigate her vegetable garden. This winter, she’s installing an additional 1,500-gallon rainwater cistern.

“It gets addictive,” Bouley said.

Further:

No water, no life, Dolman reminds people. The abandoned orchards and walls of civilizations that forgot, refused or became unable to balance their water use with their water supplies mark the course of our past 10,000 years, he said, adding that we should call it planet Water instead of planet Earth.

Other planets have soil; what they lack is water. Disrupt the water cycle to too great an extent and communities fragment, governments topple, and the quality, abundance and diversity of life diminishes, Dolman said.

He gives 50 to 60 talks a year to groups ranging from the Audubon Society to the Rotary Club, where he attempts to increase understanding of how water moves through urban and rural landscapes and how humans can participate wisely in its course.

Dolman and his co-workers teach workshops on how to install rain gardens and roof water harvesting systems, how to reduce sediment flow into creeks and rivers (which compromises fish habitat while washing valuable topsoil downstream) and how to mend eroding waterways. The Water Institute’s signature four-day “Basins of Relations” seminar promotes collective action.

Each of us lives in a watershed - though we might not be able to quickly define our own - that runs from ridgelines to river mouth. How water rushes or wends (or no longer finds) its way to the ocean affects and connects cities, farmers and ranchers, developers, fishermen, storm and wastewater managers, and plants and animals.

“You rapidly, within seconds, reach global questions when discussing water in any system,” said Kathleen Kraft, who lives outside Occidental in the Salmon Creek watershed. “Every stakeholder in a watershed has a right to be there. Who’s allocated less; who doesn’t get any?”

Kraft, a baroque flutist, was a member of the Water Institute’s first Basins of Relations seminar nine years ago. Since then, Kraft and others have secured nearly $2 million in grants for various Salmon Creek watershed studies and water conservation and watershed rehabilitation projects.

On the property she leases, Kraft is using a grant from the California Department of Forestry and Fire Prevention to thin a forested slope and remove the lower 12 feet of branches ("fire ladders") from trees. The goal is to maintain forest health, reduce the potential fuel load in the event of a fire and prevent catastrophic sediment flow into the creek.
Getting everyone involved

One of the most important benefits of the Basins of Relations seminar for Angie Stuart, a conservation program specialist with the Resource Conservation District of Santa Cruz County, was learning to look for who should have input on a conservation project.

“Dolman stresses bringing everyone together prior to there being a problem,” said Stuart. “Don’t forget the landowners and contractors, the local associations and agencies. Make sure you’re always talking to everyone who should be participating.”

Watershed problems and solutions run downstream. “The fun part about water is that it is so interrelated,” Dolman said. “As soon as you make a decision to do right by storm water - slowing it, spreading it, sinking it - you solve multiple problems. You reduce flooding in the winter. That reduces the impact on the creeks and creek downcutting and improves water quality, which is better for the fish.

“You reduce how frequently storm water overwhelms your wastewater systems. At the same time, you’re putting more water in the ground, which improves water supply. There is a lot of opportunity to think how we redesign human civilization from a water-literate angle.”

People are listening. Seventy signed up for a recent roof water harvesting class at the Water Institute, for which there were only 30 spots. “The demand is up like we’ve never seen it,” Dolman said. “In the past, it was hard to fill some courses. Now we’re wait-listed on everything.”

In August, Bouley invited Brock to do a presentation titled “Rainwater Harvesting and Blue Landscaping” in Fairfax (Marin County). “There were over 200 people that showed up,” said Bouley. “There were people looking in through the windows; the room was just overflowing.”
To learn more

For more information on the Water Institute at the Occidental Arts & Ecology Center or to order Brock Dolman’s 20-page guide to protecting and restoring watersheds, go to http://www.oaecwater.org or call (707) 874-1557.

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Posted: 09 December 2008 08:30 PM   [ Ignore ]   [ # 3 ]
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Greywater Collection, Recycling, Gardening, Purification....and more
http://www.greywater.net/

John Todd’s company - “a world leader in bioremediation and water purification”
http://www.oceanarks.org/

Here’s a great collection of PDF case studies, often in remarkable detail, of John Todd’s work:
http://www.toddecological.com/casestudies.html

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Posted: 17 December 2008 12:19 PM   [ Ignore ]   [ # 4 ]
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Great Water Crisis overview from Peter Glieck:
http://www.wired.com/politics/law/magazine/16-10/sl_gleick

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Posted: 18 December 2008 10:17 AM   [ Ignore ]   [ # 5 ]
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Info-porn that’s sadly out of stock:
http://www.betterworld.com/Ecological-Planning-Design-Engineering-Solving-Global-Water-Crises-id-0976168952.aspx

This comes highly-recommended but I haven’t picked it up yet...a “Backyard Aquaponics” DVD course from australia:
http://www.backyardaquaponics.com/further information.htm

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Posted: 05 January 2009 07:44 PM   [ Ignore ]   [ # 6 ]
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http://video.google.com/videoplay?docid=6227854076904348077

SWITCH: Towards a Water-Sustainable City of the Future....European Commission video and pretty interesting overview.

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