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Public Domain Picture: A tanker truck dispenses caustic into C-104, the third of three tanks now in the process of active solid waste retrieval.

Courtesy: US Department of Energy
Views: 604 | Downloads: 1
A tanker truck dispenses caustic into C-104, the third of three tanks now in the process of active solid waste retrieval.
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A tanker truck dispenses caustic into C-104, the third of three tanks now in the process of active solid waste retrieval.
Description:
For the first time; waste solids are in the process of being retrieved simultaneously from three underground tanks: C-104; C-107 and C-109.Crews are working to remove the last bit of hard heel waste from C-104. Tuesday; crews began a four-week recirculation of caustic in the tank after 15; 000 gallons of sodium hydroxide were added the previous week to begin dissolution of the remaining hard heel. During the recirculation period; the caustic will react with the gibbsite to create a water-soluble salt. After the reaction is complete; the remaining material will be pumped to double-shell tank AN-101 and C-104 will undergo a final rinse.To date; crews have used modified sluicing and hot water washes to remove more than 98 percent of the 259; 000 gallons of waste C-104 contained when retrieval began in January 2010. The Tri-Party Agreement requires that 99 percent of the waste is removed from the single-shell tanks or certain criteria are met regarding limits of technology.Meanwhile; the Mobile Arm Retrieval System (MARS) marches on in tank C-107; having removed nearly 66 percent of the tank’s contents. MARS’ robotic arm has used its high-pressure nozzles to break up waste in C-107 and sweep it to a pump for removal. Its mobility has allowed operators to quickly and skillfully maneuver around obstacles found in the tank that would normally set back retrieval efforts a number of weeks.A third tank; C-109; is in the middle of a water soak aimed to loosen and break down waste solids into a mobile form. Recent sampling shows the hard-to-remove heel is dissolving and slurry pump activities are forecast to occur in July or August. It’s estimated that less than 14 percent of the original starting volume of 63; 000 gallons remains in the tank.All this activity is in addition to the completion of retrieval activities earlier this year in tank C-108; which is awaiting review by the Department of Ecology.
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604
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Date Added:
June 8, 2014
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Size: 800 x 564
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Produced by United States Government
The file available on this page is a work of the United States government. A work of the United States government, as defined by United States copyright law, is "a work prepared by an officer or employee of the U.S. government as part of that person's official duties." In general, under section 105 of the Copyright Act, such works are not entitled to domestic copyright protection under U.S. law.
US Department of Energy

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US Department of Energy (Flickr Photostream)
External Site: US Department of Energy
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