Upload
vuonghuong
View
217
Download
0
Embed Size (px)
Citation preview
TOC Removal Physical Removal of Particulates
Coagulation, Filtration Enhanced Precipitative (Lime) Softening Enhanced
Adsorption Granular Activated Carbon GAC Powdered Activated Carbon PAC Anion Exchange Resin MIEX Macroreticular Resin XE340
Oxidation KMnO4, O3, ClO2
Granular Activated Carbon
Fabricated at the University of Missouri-Columbia, the first pilot plant study of the removal of THM and TOC on GAC and macroreticular resins was conducted at the Kansas City water treatment plant in 1976-1977.
GAC Post-Adsorption for TOC
BBBBB
B
JJ
JJJJ H
HH
HHH
FFFFFF
B
BBBB
B
0
1
2
3
4
5
0 24 48 72
TOC
, mg
C /
l
Hours
B Raw
J Settled
H Filtered
F Clear Well
B GAC Post-adsorber
Effect of pH on TTHMFP - St. Louis, MO
5.5 7.5 100
100
200
300
400
500
600TT
HM
FP, µ
g/l
pH
CHCl3BrCHCl2ClCHBr2CHBr3
Rate of TTHM Formation Mississippi River - St. Louis
B
B
B
B
B
B
BB
B
JJJJJJJJJ HHHHHHHHH FFFFFFFFF0
100
200
300
400
500
0 24 48 72 96 120 144 168
THM
Com
poun
ds, µ
g/l
Hours
B CHCl3J BrCHCl2H ClCHBr2F CHBr3
B BB
B B B B B B B B BJ JJ
J J J J J J J J JH H
HH H
HH H H
HH
HF FF
F F FF F F
FF F
2 4 5 12 13 20 21 24 25 26 39 460
20
40
60
80
100
120TT
HM
, µg/
l
Time, days
B East Settling Basin
J West Settling Basin
H North Filter
F South Filter
Clear Well #2
Clear Well #4
TTHM Formation During Treatment
Increasing time of chlorine contact
B B B B B B B BB
BB B
B B B B B B B B BJ J
JJ
J J J JJ
JJ J J J J J
J JJ J JH H
HH
H H H HH H H H H H H H H H H H H
F F F F
F F F FF
F
F FF F
FF F F F
F F
2 4 5 6 10 17 18 19 20 21 24 25 26 27 28 39 46 55 62 89 950
10
20
30
40
50
60
70
80TT
HM
, µg/
l
Days
B Settling Basin #2J Settling Basin #3H Settling Basin #4F East Filter West Filter Clear Well #1 Clear Well #2
TTHM Formation During Treatment
Increasing time of chlorine contact
Seasonality of THM Formation
B
B
BB
B
B
B
B
B
B
B
B
J
J JJ
J
J
J
J
J
J
J
J
HH H H
H H
H H H HH
H
FF F F
F F
F FF F
F F
2/98 5/98 8/98 11/98 2/99 5/99 8/99 11/99 2/00 5/00 8/00 11/00012345
50
100
150
200
250
300
TOC,
mg/
l
TTH
M, µ
g/l
B dist. sys. avg. THM
J plant tap THM
H raw water TOC
F filter influent TOC
Effects of Temperature on TTHM
TTHM, µg / l Winter Summer > 100 0 3 80-100 0 6 60-80 0 19 40-60 3 53 <40 97 19
Lake Settled Wilson Ozark GAC-Cap GAC 10m GAC 20m0
50
100
150
200
250
TTH
MFP
, Hal
oace
tic A
cids
, µg
/ l
TTHMFP7HAA6
TTHMFP and HAA Removal on GAC
Raw
Wat
er
Alu
m
+ 10
mg/
l PA
C
+ 20
mg/
l PA
C
+ 40
mg/
l PA
C
+ 50
mg/
l PA
C
Raw
Wat
er
Alu
m
+ 1
mg/
l KM
nO4
+ 2
mg/
l KM
nO4
+ 3
mg/
l KM
nO4
+ 5
mg/
l KM
nO4
Raw
Wat
er
Alu
m
KM
nO4
(2m
g/l)
KM
nO4
+ 10
mg/
l PA
C
KM
nO4
+ 20
mg/
l PA
C
KM
nO4
+ 40
mg/
l PA
C
0
20
40
60
80
100
120
140
160TT
HM
FP, µ
g/l
PAC KMnO4 PAC + KMnO4
Effect of PAC, KMnO4 on TTHMFP
B
BB
BB
J
JJJJ
J
H
HHH
H
HF
F
FF
F
F
0
50
100
150
200
250
0 30 60 90 120 150 180 210
THM
-form
ing
Pote
ntia
l, µ
g C
HC
l3 /
l
Days after Start of Pilot GAC Columns
B Lake
J Settled
H Wilson
F Ozark Pt.
GAC-capped
GAC 10 m
GAC 20 m
GAC Post-Adsorption for TTHMFP
Trihalomethane Formation Potential (TTHMFP)
Determination of maximum potential for TTHM formation after seven days
in distribution system
• Add chlorine to water in excess of seven day chlorine demand
• Measure TTHM after seven days
J
J
J
J
JJJJJ
JJ
JJ
J
J
J
J
J
J
JJJ
J
J0
50
100
150
200
250
0 1 2 3 4 5
TTH
M F
orm
ing
Pote
ntia
l, µg
/l
Chlorine Consumption, mg Cl/l
TTHMFP and Chlorine Consumption