mexico seminar presentation - KPMG...mexico seminar presentation - KPMG ... 月
Presentation given at SKYREC seminar, 2011
20
Activated carbon and UV treatment in TOC removal field tests Tero Luukkonen, 20.10.2011
-
Upload
tero-luukkonen -
Category
Technology
-
view
95 -
download
0
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 of Presentation given at SKYREC seminar, 2011
Activated carbon and UV treatment in TOC removal field tests
Tero Luukkonen, 20.10.2011
Main participants in the project
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
Active carbon tests: experimentalset-up
Water treatment process of Stora Enso Oulu mill
Active carbon tests: experimentalset-up
Test scheme of pilot scale AC filters.
Test scheme of full scale AC filters.
demineralized water
AC 1
MB
AC 2
Active carbon: TOC reductions
Pilot scale AC filters
Full scale AC filters
Residual TOC removal 38 – 57 %
Residual TOC removal 40 – 65 %
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
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
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
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
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)
UV treatment: experimental set-up
Influent water
UV champers
MB unitMB
Demineralizedwater
UV
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
TiO2 shouldenhancehydroxyl radicalformation
This type ofcatalyst (porousnet) had noeffect
TiO2 catalyst
UV treatment: H2O2 dosing
H2O2 (35 %), elevated to ~ 40 m from dosing pointFlowmeter
Unknown peaks in LC-OCD chromatogramwhich are probablyplastic additives
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
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
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
