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Effects of ozonation on coagulation of NOM using polymer alone and polymer/metal salt mixtures
Author(s) -
Edwards Marc,
Benjamin Mark M.,
Tobiason John E.
Publication year - 1994
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 - 10.1002/j.1551-8833.1994.tb06140.x
Subject(s) - alum , coagulation , polymer , chemistry , salt (chemistry) , filtration (mathematics) , ferric , cationic polymerization , water treatment , organic polymer , organic matter , chemical engineering , inorganic chemistry , polymer chemistry , environmental engineering , organic chemistry , environmental science , psychology , statistics , mathematics , psychiatry , engineering
The possible benefits of reduced coagulant demand and head loss resulting from preozonation must be weighed against increased organic matter in the finished water. Prior investigations have identified many of the mechanisms by which natural organic matter (NOM), coagulant, and particles interact in ozonated systems. This study investigated the effects of ozonation on coagulation with cationic polymer and with polymer‐metal salt mixtures. Preozonation decreased the concentration of NOM that reacts with polymer, reducing organic carbon removal, polymer coagulant demand, and the rate of head loss buildup during direct filtration. The effects of ozonation in systems using dual coagulants (alum‐polymer or ferric chloride‐polymer) were a blend of the effects observed for the coagulants individually.