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Ballasted Sedimentation Boosts Floc Settling
Author(s) -
Thompson Donald,
Moore Richard,
Hackworth David
Publication year - 2005
Publication title -
opflow
Language(s) - English
Resource type - Journals
eISSN - 1551-8701
pISSN - 0149-8029
DOI - 10.1002/j.1551-8701.2005.tb01809.x
Subject(s) - sedimentation , alkalinity , settling , environmental science , water quality , flocculation , water treatment , raw water , bay , coagulation , hydrology (agriculture) , environmental engineering , oceanography , geology , sediment , ecology , geotechnical engineering , chemistry , biology , psychology , paleontology , organic chemistry , psychiatry
This article discusses how Tampa Bay Regional Surface Water Treatment Plant effectively treats three surface water sources (river, storm water canal, and reservoir), each with distinctive water quality characteristics including high color and dissolved organic carbon (DOC), seasonally high alkalinity and hardness, occasional algae blooms, other seasonal fluctuations, and sudden spikes brought on by rain. The treatment plant meets the challenge by incorporating ballasted sedimentation in the coagulation flocculation‐sedimentation process. Operating since 2002, the treatment plant demonstrates the effectiveness of ballasted sedimentation for removing relatively high organic carbon content despite significant variations in raw water quality. The article explains why conventional processes wouldn't work, how the ballasted sedimentation process works, and the benefits gained by using this process.