Transcript 대표적 용존유기물질의 멤브레인 특성에 따른 effective size 분석

핵 심 기 술Ⅲ
멤브레인 막오염 예측/평가 기술 개발
: Flow Field Flow Fractionation (FlFFF)
특정오염물질의 멤브레인에서의 이동특성
평가: 유효크기 및 확산계수 산정
특정오염물질-특정멤브레인 사이의 막오
염 경향 해석/예측: moment analyses
Initial
Sample Zone
Field
Separated
Component Zones
Convection
Diffusion
Channel
Flow
Parabolic Flow Profile by
channel flow
Accumulation wall“Membrane”
핵심기술 Ⅲ
Results
FlFFF: Effective Size & Diffusivity of Organic Matter
대표적 용존유기물질의 멤브레인 특성에 따른 effective size 분석
regenerated cellulose
(neutral & hydrophilic)
NE-90 (새한)
(negative-charged & hydrophobic)
1000
300
SR-HA
750
500
100
detection response
250
detector response
SR-HA
200
0
2000
SR-NOM
1500
1000
500
0
150
DI water
1mM KCl
0.05% FL70
100
50
NR-NOM
0
300
SR-NOM
200
100
0
150
DI water
1mM KCl
0.05% FL70
100
50
NR-NOM
0
0
0
200
400
600
800
0
200
400
600
retention time (sec)
retention time (sec)
• effect of ionic strength on the retention time and the shape of peak  NE-90 >> RC
• RT in NE-90 : DI water < 0.05% FL-70 < 1mM KCl (increase of hydrophobic property)
NR-NOM
800
핵심기술 Ⅲ
Results
FlFFF를 이용한 하수처리수 내 유기물질(EfOM)의
막오염 경향 분석
• 멤브레인의 특성에 따라 FlFFF peak의 경향이 달라짐
“Reference membrane:RC”
 검출방법에 따른 화학적 특성 분석
 막오염 예측/평가 가능
400
300
UVA
Fluorescence
250
< 2nm
300
150
Rep1
Rep2
6~14nm
100
response
response
200
Rep1
200
Rep2
100
50
0
0
0
1000
2000
RT (sec)
3000
4000
0
1000
2000
RT (sec)
3000
4000
핵심기술 Ⅲ
Results
FlFFF: Effective Size & Diffusivity of Organic Matter
특정 오염물질의 solution chemistry에 따른 effective size 분석
Conductivity, mS/cm
PSS, Na salt (1,800~35,000 Da) in RC 1kD
9
KCl, 0.01mM
KCl, 1mM
KCl, 10mM
KCl, 20mM
FL-70, 0.05%
FL-70. 0.01%
8
Mean Size, nm
7
6
d p   (MW ) 
1,400~
d=0.0038Mw0.73, R2=0.991
120
5
4
50
3
10~20
2
d=0.025Mw0.44, R2=0.9993
1
0
0
10000
20000
30000
Molecular Weight, nominal
40000
핵심기술 Ⅲ
Results
FlFFF: Effective Size & Diffusivity of Organic Matter
대표적 용존유기물질의 solution chemistry에 따른 effective size 분석
2.0
2.0
NRNOM
DLNOM
SRNOM
SRFA
SRHA
1.5
1.0
0.5
NRNOM
DLNOM
SRNOM
SRFA
SRHA
UVA at 254nm
Mean Size, nm
Mean Size, nm
Fluorescence at ex.278 and em. 353
(for protein-like substances)
1.5
1.0
0.5
0.01mM
0.1mM
1mM
10mM
20mM
0.01%
0.05%
KCl
FL-70
KCl
FL-70
0.01mM
0.1mM
1mM
10mM
KCl
KCl
20mM
0.01%
0.05%
FL-70
FL-70
The effect of solution chemistry on the solute transport characteristics
10mM KCl
: open rod-like structure close coiled structure
cond. 1.4mS/cm
핵심기술 Ⅲ
Results
FlFFF를 이용한 하수처리수 내 유기물질
이동특성 및 막오염예측 (reference membrane)
higher skewness tailing
fouling propensity increase
UVA
at 254nm
Fluorescence
Ex. 278nm
Em. 353nm
Size (nm)
Diffusivity
10-6(cm2/sec)
Skewness
(fouling propensity)
EfOM*
MBR-HP**
EfOM
MBR-HP
EfOM
MBR-HP
0.05% FL70
1.18
1.46
4.19
3.63
0.31
0.46
DI water
1.56
2.75
3.88
2.98
2.81
14.76
1mM KCl
0.94
1.14
4.83
4.29
0.01
0.46
0.05% FL70
1.14
1.24
4.69
4.17
0.45
0.32
DI water
6.93
3.12
1.82
3.11
-24.21
45.27
1mM KCl
0.77
1.44
5.97
4.05
0.02
3.25
*EfOM: MBR effluent organic matter, **hydrophobic fraction of MBR EfOM
Fouling propensity: hydrophobic EfOM > protein-like EfOM
Effect of solution chemistry: ionic strength