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Transformation of Molecular Weight Distributions of Dissolved Organic Carbon and UV‐Absorbing Compounds at Full‐Scale Wastewater‐Treatment Plants
The molecular‐weight distribution (MWD) of wastewater dissolved‐organic carbon (DOC) was determined in samples from seven full‐scale wastewater‐treatment plants (WWTPs) that use different biological treatments (air activated sludge [air‐AS], pure‐oxygen AS [O 2‐AS], and trickling filters). The research objective was to determine how different biological treatments influenced the MWD of wastewater DOC. Primary sedimentation effluent DOC from most of the WWTPs exhibited a skewed distribution toward the low‐molecular‐weight fraction (MWF) (40 to 50%, <0.5 K Daltons [KDa]). The Air‐AS effluent DOC exhibited a centrally clustered distribution, with the majority of DOC in the intermediate MWF (0.5 to 3 KDa). The O 2‐AS effluent DOC exhibited a skewed distribution toward the high MWF (>3 KDa). The removal of DOC by air‐ and O 2‐AS bacteria followed trends predicted by a macromolecule degradation model. Trickling‐filter effluent DOC exhibited a skewed distribution toward the high MWF (50% DOC, >3 KDa).
Transformation of Molecular Weight Distributions of Dissolved Organic Carbon and UV‐Absorbing Compounds at Full‐Scale Wastewater‐Treatment Plants
The molecular‐weight distribution (MWD) of wastewater dissolved‐organic carbon (DOC) was determined in samples from seven full‐scale wastewater‐treatment plants (WWTPs) that use different biological treatments (air activated sludge [air‐AS], pure‐oxygen AS [O 2‐AS], and trickling filters). The research objective was to determine how different biological treatments influenced the MWD of wastewater DOC. Primary sedimentation effluent DOC from most of the WWTPs exhibited a skewed distribution toward the low‐molecular‐weight fraction (MWF) (40 to 50%, <0.5 K Daltons [KDa]). The Air‐AS effluent DOC exhibited a centrally clustered distribution, with the majority of DOC in the intermediate MWF (0.5 to 3 KDa). The O 2‐AS effluent DOC exhibited a skewed distribution toward the high MWF (>3 KDa). The removal of DOC by air‐ and O 2‐AS bacteria followed trends predicted by a macromolecule degradation model. Trickling‐filter effluent DOC exhibited a skewed distribution toward the high MWF (50% DOC, >3 KDa).
Transformation of Molecular Weight Distributions of Dissolved Organic Carbon and UV‐Absorbing Compounds at Full‐Scale Wastewater‐Treatment Plants
Esparza‐Soto, Mario (author) / Fox, Peter (author) / Westerhoff, Paul (author)
Water Environment Research ; 78 ; 253-262
2006-03-01
10 pages
Article (Journal)
Electronic Resource
English
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