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Figure 2 - NH Active Public Water Systems
0
500
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1500
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2500
3000
2007 2008 2009
Num
ber o
f Sys
tem
s CWS
NTNC
NC
TOTAL721
451
1244
2416
712
447
1256
2415
709
444
1260
2413
ARSENIC STRATEGIES
TREATMENT~74%
BLENDING ~23%
STILL >10 PPB~3%
Figure 2 - NH ARSENIC TREATMENT TECHNOLOGIES
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New Adsorption medias
Iron-Arsenic filters
Anion Exchange
Activated Alumina
POU Reverse Osmosis
POU Adsorption
Number of Systems
Total = 151CWS and NT/NC
March 2009
Adsorption Treatment Examples
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Q106 Q206 Q306 Q406 Q107 Q207 Q307 Q407 Q108 Q208 Q308 Q408 Q109
Tre
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wat
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s, p
pb
12345678910
New MCL = 10 ppb RAA
Adsorptive Media Bedlife Performance
37,600
20,000 19,000
58,500
12,100
83,300
36,700
20,000
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10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
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A B C D E F G H
Bed
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lum
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f W
ater
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pp
b b
reak
thro
ug
h
1 BV = CF media x 7.48 gal/CFExample:1.5 million gallons treated by10 CF arsenic media= 20,000 BV bedlife
RSSCT Adsorptive Media CompareRSSCT Adsorptive Media CompareRSSCT = Rapid Small Scale Column TestingRSSCT = Rapid Small Scale Column Testing
30-60 days test duration30-60 days test duration
Up to 5 medias / columnsUp to 5 medias / columns
Equipment available free Equipment available free from DES and UNH TACfrom DES and UNH TAC
PWS collects and pays PWS collects and pays sample analysessample analyses
Daily inspection requiredDaily inspection required
Anion ExchangeAnion Exchange
Simplest onsite regenerationSimplest onsite regeneration
Must manage alkalinity / corrosionMust manage alkalinity / corrosion
Dumping happens!Dumping happens!
No As III removalNo As III removal
Anion Exchange Treatment Examples
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Q106 Q206 Q306 Q406 Q107 Q207 Q307 Q407 Q108 Q208 Q308 Q408 Q109
Tre
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wat
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s, p
pb
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New MCL = 10 ppb RAA
Iron-Arsenic Oxidation Filtration Iron-Arsenic Oxidation Filtration ((aka greensandaka greensand))
20:1 Iron to As ratio 20:1 Iron to As ratio
pH ≤7.5pH ≤7.5
Chlorine or Chlorine or Permanganate feedPermanganate feed
High Backwash Rate High Backwash Rate Pyrolusite mediasPyrolusite medias
Backwash filter or Backwash filter or common septic tankcommon septic tank
Iron-Arsenic Oxidation-Filtration Examples
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Q106 Q206 Q306 Q406 Q107 Q207 Q307 Q407 Q108 Q208 Q308 Q408 Q109
Trea
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wat
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s, p
pb
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New MCL = 10 ppb RAA
www.des.nh.govwww.des.nh.gov A to Z list A to Z list
– ““A” = Arsenic drinking water pageA” = Arsenic drinking water page– ““R” = Radon in Air pageR” = Radon in Air page– ““R” = Rads drinking water pageR” = Rads drinking water page– ““S” = Small PWS Help CenterS” = Small PWS Help Center– ““U” = Uranium / rads pageU” = Uranium / rads page
Quick Links “Publications/Factsheets”Quick Links “Publications/Factsheets”
[email protected]@des.nh.gov, 271-3108, 271-3108
