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Pretreatment impacts on biopolymers in adjacent ultrafiltration plants
Author(s) -
SiembidaLösch Barbara,
Anderson William B.,
Bonsteel Jane,
Huck Peter M.
Publication year - 2014
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.5942/jawwa.2014.106.0080
Subject(s) - biopolymer , ultrafiltration (renal) , chemistry , membrane , biofilter , water treatment , ozone , pulp and paper industry , chromatography , environmental engineering , environmental science , organic chemistry , biochemistry , engineering , polymer
Full‐scale studies were conducted to determine the effects of the configuration or absence of pretreatment on membrane performance at two full‐scale ultrafiltration (UF) drinking water treatment plants sharing a common raw water source. One plant had no pretreatment before the membranes, and the other had ozone and biologically active carbon contactor pretreatment. At one point during this study, ozonation was out of service, and this presented an opportunity to compare ozone on/off scenarios. Ozone addition was observed to reduce biopolymer retention by UF membranes up to 23%. Although lower normalized flux (20°C) was associated with higher biopolymer retention by UF membranes, higher retention was found to not affect membrane permeability. Assimilable organic carbon was not a good surrogate for biopolymer removal by biofiltration. Variations in the raw water biopolymer fractions at both plants were associated with seasonal changes in temperature and potentially lakewide flow‐circulation patterns.