The Impact of UV/H2O2Advanced Oxidation on Molecular Size Distribution of Chromophoric Natural Organic Matter

2007 ◽  
Vol 41 (24) ◽  
pp. 8315-8320 ◽  
Author(s):  
Siva R. Sarathy ◽  
Madjid Mohseni
Keyword(s):  
Organic Matter ◽  
Size Distribution ◽  
Natural Organic Matter ◽  
Molecular Size ◽  
Molecular Size Distribution ◽  
The Impact

Molecular size distribution of natural organic matter in raw and drinking waters

Chemosphere ◽  
2001 ◽  
Vol 45 (6-7) ◽  
pp. 865-873 ◽  
Author(s):  
T.K. Nissinen ◽  
I.T. Miettinen ◽  
P.J. Martikainen ◽  
T. Vartiainen
Keyword(s):  
Organic Matter ◽  
Size Distribution ◽  
Natural Organic Matter ◽  
Molecular Size ◽  
Drinking Waters ◽  
Molecular Size Distribution

Influence of UV irradiation and UV/hydrogen peroxide oxidation process on natural organic matter fluorescence characteristics

2004 ◽  
Vol 4 (4) ◽  
pp. 41-46
Author(s):  
D.E.W. Hofbauer ◽  
S.A. Andrews
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Uv Irradiation ◽  
Distribution Systems ◽  
Molecular Size ◽  
Peroxide Oxidation ◽  
Fluorescence Characteristics ◽  
Molecular Size Distribution ◽  
Uv Lamps

Natural organic matter is ubiquitous in aquatic systems, and has long been associated with disinfection by-product (DBP) formation during chlorination in water treatment plants and distribution systems. In this study modelled water was irradiated with either ultraviolet (UV) lamps or with UV combined with the addition of hydrogen peroxide (H2O2). The changes in the fluorescence intensity between the pretreated and post-treated samples were measured to determine the changes in the molecular size distribution of this reactive fraction of NOM. It was determined that the UV/H2O2 process reduces the concentration of these potential DBP precursors more effectively than UV irradiation alone.

Determination of the Size Distribution of Dissolved Organics in Effluents

1973 ◽  
Vol 8 (1) ◽  
pp. 1-15 ◽  
Author(s):  
L.A. Addie ◽  
K.L. Murphy ◽  
J.L. Robertson
Keyword(s):  
Size Distribution ◽  
Biological Treatment ◽  
Oxygen Demand ◽  
Molecular Size ◽  
Monitoring Systems ◽  
Clean Surface ◽  
Sephadex Column ◽  
Dissolved Organics ◽  
Molecular Size Distribution

Abstract The importance of removing the small amounts of residual organics is increasing as the sources of clean surface water decrease. Knowledge of the nature of these soluble residual organics will be needed in order to assess the type of treatment required for their removal. Residual organics in three different biological treatment plants were analyzed and compared. An attempt was made to characterize these organics by a molecular size distribution on a Sephadex column monitored by differential ultraviolet and refractive index detectors. The organic carbon and chemical oxygen demand of the fractions collected from the column was also determined. An investigation of some of the problems inherent in the monitoring systems was conducted.

Molecular Size Distribution of Lignin in Wood

Nature ◽  
1967 ◽  
Vol 214 (5086) ◽  
pp. 410-411 ◽  
Author(s):  
W. BROWN ◽  
S. I. FALKEHAG ◽  
E. B. COWLING
Keyword(s):  
Size Distribution ◽  
Molecular Size ◽  
Molecular Size Distribution

A Study of the Malpighian Tubules of the Pill Millipede, Glomeris marginata (Villers)

1974 ◽  
Vol 60 (1) ◽  
pp. 41-51
Author(s):  
PATRICIA ANNE FARQUHARSON
Keyword(s):  
Size Distribution ◽  
Fluid Transport ◽  
Molecular Size ◽  
Malpighian Tubules ◽  
Inverse Relation ◽  
Fluid Production ◽  
Molecular Size Distribution ◽  
Molecular Sieving ◽  
Tubule Fluid ◽  
Tubule Wall

1. Tubule fluid:medium ratios (TF/M) have been measured for inulin, glucose, LMWD and HMWD. These TF/M ratios were surprisingly high. 2. The tubule appears to act as a molecular filter; that is to say, molecules move through the tubule wall in inverse relation to their size. This is best illustrated using polyvinyl pyrrolidone as a tracer. The molecular size distribution of PVP fractions present in tubule fluid differs markedly from the molecular size distribution of PVP in the bathing Ringer. 3. No correlation can be made between the inulin and glucose TF/M and the rate of fluid production. However, the inverse relationship between TF/M and rate of fluid production for dextrans indicates a molecular sieving effect. 4. The significance of these results is discussed with reference to models of fluid transport.

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