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Biostability Characterization in a Full-scale Nanofiltration Water Treatment System  

Hong, Seung-Kwan (Civil and Environmental Engineering Department, Korea University)
Escobar, Isabel C. (Civil and Environmental Engineering Department, University of Toledo)
Cho, Jae-Weon (Environmental Engineering Department, Gwangju Institute of Science and Technology)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.2, 2005 , pp. 158-162 More about this Journal
Abstract
The objective of this study was to assess the assimilable organic carbon (AOC) in processing water, a measurement of biostability, at several stages of a full-scale nanofiltration (NF) water treatment plant. The NF membrane plant investigated was a $45,400\;m^3$/day (12 mgd) water softening facility at Plantation City in southern Florida, which utilized an organic rich groundwater (dissolved organic carbon (DOC) = 17.6 mg/L) originated from a surficial aquifer. The average AOC concentration of raw feed water was estimated at 158 g/L acetate-C. After pretreatment(acid and antiscalant addition), AOC levels increased by 12.7%, suggesting that pretreatment chemicals used to control scaling may deteriorate feed water biostability. The results also demonstrated that nanofiltration was capable of effectively removing 63.4% of AOC and 94.8% of DOC from the raw water. AOC rejection in stage 1 (${\approx}\;68%$) was slightly higher than that of stage 2 (${\approx}\;58%$) indicating that AOC was removed less at the solution environment (i.e. low pH, high ionic strength and high hardness), which was often created in the $2^{nd}$ stage of full-scale membrane plants due to pretreatment (acid addition) and high recovery operation.
Keywords
Biostability; Assimilable Organic Carbon (AOC); Dissolved Organic Carbon (DOC); Nanofiltration;
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