: Flow Field Flow Fractionation (FlFFF)

1
? ? ? ? ?
???? ??? ??/?? ?? ?? Flow
Field Flow Fractionation (FlFFF)

• ??????? ??????? ???? ?? ???? ? ???? ??
• ??????-?????? ??? ??? ?? ??/?? moment analyses

2
Results
???? ?
FlFFF Effective Size Diffusivity of Organic
Matter
??? ??????? ???? ??? ?? effective size ??
regenerated cellulose (neutral hydrophilic)
NE-90 (??) (negative-charged hydrophobic)

• effect of ionic strength on the retention time
  and the shape of peak ? NE-90 gtgt RC
• RT in NE-90 DI water lt 0.05 FL-70 lt 1mM KCl
  (increase of hydrophobic property)

3
Results
???? ?
FlFFF? ??? ????? ? ????(EfOM)? ??? ?? ??

• ????? ??? ?? FlFFF peak? ??? ???
• ? ????? ?? ??? ?? ??
• ? ??? ??/?? ??

Reference membraneRC
4
Results
???? ?
FlFFF Effective Size Diffusivity of Organic
Matter
?? ????? solution chemistry? ?? effective size ??
PSS, Na salt (1,80035,000 Da) in RC 1kD
Conductivity, mS/cm
1,400
d0.0038Mw0.73, R20.991
120
50
1020
d0.025Mw0.44, R20.9993
5
Results
???? ?
FlFFF Effective Size Diffusivity of Organic
Matter
??? ??????? solution chemistry? ?? effective size
??
KCl
FL-70
KCl
FL-70
10mM KCl cond. 1.4mS/cm
The effect of solution chemistry on the solute
transport characteristics open rod-like
structure? close coiled structure
6
Results
???? ?
FlFFF? ??? ????? ? ???? ???? ? ????? (reference
membrane)
higher skewness? tailing fouling propensity increase higher skewness? tailing fouling propensity increase Size (nm) Size (nm) Diffusivity 10-6(cm2/sec) Diffusivity 10-6(cm2/sec) Skewness (fouling propensity) Skewness (fouling propensity)
higher skewness? tailing fouling propensity increase higher skewness? tailing fouling propensity increase EfOM MBR-HP EfOM MBR-HP EfOM MBR-HP
UVA at 254nm 0.05 FL70 1.18 1.46 4.19 3.63 0.31 0.46
UVA at 254nm DI water 1.56 2.75 3.88 2.98 2.81 14.76
UVA at 254nm 1mM KCl 0.94 1.14 4.83 4.29 0.01 0.46
Fluorescence Ex. 278nm Em. 353nm 0.05 FL70 1.14 1.24 4.69 4.17 0.45 0.32
Fluorescence Ex. 278nm Em. 353nm DI water 6.93 3.12 1.82 3.11 -24.21 45.27
Fluorescence Ex. 278nm Em. 353nm 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 gt
protein-like EfOM Effect of solution chemistry
ionic strength