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Effects of Storage and Preoxidation on Sludge and Water Quality
Author(s) -
Hoehn Robert C.,
Novak John T.,
Cumbie William E.
Publication year - 1987
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.1551-8833.1987.tb02859.x
Subject(s) - sedimentation , dewatering , alum , environmental science , manganese , waste management , water treatment , water quality , chlorine dioxide , filter (signal processing) , chlorine , environmental engineering , pulp and paper industry , chemistry , geology , sediment , engineering , inorganic chemistry , paleontology , ecology , geotechnical engineering , electrical engineering , organic chemistry , biology
Ever since the city of Newport News, Va., eliminated prechlorination at its water treatment facilities in 1982 in order to control trihalomethanes, it has been plagued by deterioration of alum sludges in manually cleaned sedimentation basins and by occasional declines in settled water quality. Laboratory and field studies showed that anaerobic conditions develop rapidly in manually cleaned sedimentation basins (but not in those that are mechanically cleaned), allowing manganese to be released from the sludge into the overlying water. The use of chlorine dioxide as a preoxidant was found to suppress this release of manganese, produce sludges with improved dewatering characteristics, and lengthen filter runs.