Carbon filter /Cs-137 removal

Submitted by Anonymous on Fri, 2011-03-25 22:01

I only glanced at this. An excerpt is below the link. I'm trying to figure out what I can do w/ my tap water. The rains in LA have contaminated our drinking water & reactor#3 is not under control 13 neutron beams.

http://www.wmsym.org/archives/2002/Proceedings/19/208.pdf

Both the 3M and Selion Cs-137 removal technologies are based on a sodium or potassium
cobalti-hexacyanoferrate compound, which is extremely selective for Cs-137. The selectivity
coefficients (Kd’s) for various Cs-137 removal ion-exchange materials are given in Table II:
Table II: CsTreat® Selectivity Coefficients for Cs vs. Na for Various Media

Media Na Concentration (moles/L) Cs Selectivity
Coefficient Kd
Strong Acid Resin N/A <10
Cs Selective (SRL R-F) 6.0 11,400
Zeolite 0.1 450
Crystalline silicotitanate (CST) 5.7 18,000
CsTreat® (hexacyanoferrate) 5.0 1,500,000

Cs-137 Removal System Descriptions

· Selion CsTreat®

The Selion CsTreat® technology is based on a deep bed ion-exchange technique, using very
finely divided hexacyannoferrate, with a very high surface area. The bed is operated in a
down–flow mode, with preferred flow rates in the range of 10 to 20 bed volumes per hour
(BV/hr). At that flow rate, the CsTreat®’s anticipated removal efficiency is greater than 99.9%
(a DF; Decontamination Factor of >1,000).

The 3M cartridge membrane is trademarked Selective Separation
Cartridge® (SSC™) The high surface area sorbent particles, in this case cobalti-
hexacyanoferrate, are loaded or enmeshed onto a web or membrane, which is then fabricated
into a spiral-wound, cartridge-filter. The R-basin deployment used 22 cylindrical cartridges,
2.3” in diameter by 21” in length, at a total cost of $60,000.

‹ Solid angle and gamma range in water corrections What about Iodine-129 - Half-Life is 15 Million Years ›

(above paper was for a huge river clean-up in S.C.)

Submitted by Anonymous (not verified) on Fri, 2011-03-25 22:05.

but at a glance, its looks like hexacyanoferrate & siliotitanate are our new friends

While I agree with being

Submitted by Anonymous (not verified) on Sat, 2011-03-26 12:12.

While I agree with being cautious and removing Cs is the best way to go, this won't change the fact that unlike with Iodine, the Cesium will contaminate crops from the central valley and anywhere else in CA for hundreds of years (its half-life of Cs-137 is 30 years), so this is a problem that won't ever go away and is not as easily alleviated as the Iodine concentration. I wonder where the US is going to get its fruit and vegetables from in the future.