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Effect of Washwater Chemistry and Delayed Start on Filter Ripening
Author(s) -
Amburgey James E.,
Amirtharajah Appiah,
Brouckaert Barbara M.,
Spivey Neal C.
Publication year - 2004
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.1551-8833.2004.tb10537.x
Subject(s) - backwashing , ripening , filter (signal processing) , chemistry , water quality , water treatment , pulp and paper industry , environmental science , biochemical engineering , process engineering , environmental engineering , computer science , engineering , food science , biology , mechanical engineering , ecology , inlet , computer vision
Delayed start is an operational procedure aimed at reducing the negative effect of the filter ripening sequence (FRS) on the quality of filtered water. The delayed start procedure has been evaluated under a variety of conditions and provides insights into the mechanisms behind the FRS. Experiments were conducted at both pilot and plant scales, and the comparison of these results led to the discovery of the importance of backwash water chemistry on the FRS. Polyphosphates in the backwash water were shown to negatively affect filtered water quality immediately after backwashing. Discoveries were also made that will help explain why delayed start seems to work well for some treatment plants and not for others.