presentation given at skyrec seminar, 2011
DESCRIPTION
Presentation given at SKYREC (2011) seminar describing results of activated carbon and UV treatment in organic material removal from deionized recovery boiler make-up water.TRANSCRIPT
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Activated carbon and UV treatment in TOC removal field tests
Tero Luukkonen, 20.10.2011
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Main participants in the project
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Active carbon tests TOC reductions Effects on conductivity of water Silica
UV treatment tests TOC reductions Effects of number of UV lamps, wavelenght, H2O2 and
TiO2 catalyst LC-OCD measurement results
Contents
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Active carbon tests: experimentalset-up
Water treatment process of Stora Enso Oulu mill
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Active carbon tests: experimentalset-up
Test scheme of pilot scale AC filters.
Test scheme of full scale AC filters.
demineralized water
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AC 1
MB
AC 2
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Active carbon: TOC reductions
Pilot scale AC filters
Full scale AC filters
Residual TOC removal 38 – 57 %
Residual TOC removal 40 – 65 %
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Active carbon: LC-OCD results(after ~ 10 months in use)
29
22
0
26
72
5demineralized water: 155 ppb
2
18
0
9
31
3AC1: 62 ppb
032
0
30
49
14MB: 125 ppb 0
14
0
5
17
2AC2: 37 ppb
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AC vs. RO (LC-OCD)
0
14
0
5
17
2AC + MB + AC: 37 ppb
0 3 0 2
34
3
RO (Ahlholmens Kraft): 42 ppb
2
18
0
9
31
3AC: 62 ppb
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Active carbon: conductivity
0,0000,0100,0200,0300,0400,0500,0600,0700,0800,090
18.12.10 3.3.11 17.5.11 31.7.11
Con
duct
ivity
mS/
m
AC1 MB AC2
Pilot scale AC filters and MB unit
Full scale AC filter
0,000
0,050
0,100
0,150
0,200
0,250
0,300
23.3.11 2.5.11 11.6.11C
ondu
ctiv
ity (m
S/m
)
Full scale AC MB
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MB unit needed after AC to decrease conductivity Correlation between TOC removal efficiency and
conductivity was a bit unclear (linear R2 only ~ 0,5) Conductivity rise at AC bed was due release of ionized
compounds from AC itself – not ionization of TOC AC bed was not operating as biological filter because
of low nutrient content of water
Active carbon: conductivity,some remarks
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Silica causes severescale problems in water-steam cycle
Measured on-lineduring full scale test
New AC bed releasedsilica for ~ 2 weeks
Silica was removedwith subsequent MB
Active carbon: silica
0,000
0,050
0,100
0,150
0,200
0,250
23.3.11 12.5.11 1.7.11
Silic
a (g
/l)
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UV treatment: experimental set-up
Influent water
UV champers
MB unitMB
Demineralizedwater
UV
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One chamber: max. 30 % TOC removal Four chambers: only 4 % increase in TOC removal
Effect of TiO2 catalyst: negligible Effect of H2O2: ? (experimental set-up failed: plastic piping
released organic compounds)
Effect of wavelenght: Medium pressure lamp (wavelenght peaks at 254 nm and 185
nm): better (30 % TOC removal) Low pressures lamp (wavelengh peak sharply at 185 nm): not
that effective
UV treatment: results
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TiO2 shouldenhancehydroxyl radicalformation
This type ofcatalyst (porousnet) had noeffect
TiO2 catalyst
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UV treatment: H2O2 dosing
H2O2 (35 %), elevated to ~ 40 m from dosing pointFlowmeter
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Unknown peaks in LC-OCD chromatogramwhich are probablyplastic additives
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UV treatment: LC-OCD
29
22
0
26
72
5demineralized water: 155 ppb
0 6 0
36
47
19UV: 108 ppb
0 7 016
87
4UV + MB: 113 ppb
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Active carbon can remove up to 40 - 60 % of residualorganic material (TOC)
AC bed lifetime before regeneration is at least 10 months
Subsequent MB is needed to remove elevatedconductivity and silica
AC works fine in full scale
Conclusions: AC
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UV treatment was able to remove up to 30 % of residualTOC
Removal efficiency did not improve with: Lower wave lenght (more energy) H2O2 (oxidant) TiO2 (catalyst) Number of UV chambers (contact time)
Possible reason for this: water should be pretreated with e.g. RO (this is normal procedure in microelectronic orpharmaceutical industry water treatment)
Conclusions: UV