AWWA ACE70591

This powerpoint presentation begins by presenting study objectives: improve performance of 1938 softeningbasins without major capital costs; and,optimize chemical usage while meetingwater quality goals. A brief overview of the Minneapolis Water WorksTreatment System is provided, along with water quality treatment, turbidity issues in softening basins, bench testing to optimize chemicals, the impact of lime dose on water quality, the impact of alum dose on water quality, impact of ferric dose on water quality, dissolved organic carbon (DOC) removal with various chemicals, methods of natural organic matter (NOM) characterization, EEM analysis through MinneapolisTreatment Plant, organic fraction removalthrough treatment, THM formation potential, jar test conclusions, full scale testing to optimizesoftening basin performance, coagulant mixing improvements, and sludge mixing improvements. Presentation summary indicates:Lime Softening is an important treatment process forhardness and TOC removal;optimizing lime and coagulant doses maintain goodhardness and TOC removal, and minimize DBPformation;the old softening basin design is not optimum forturbidity removal on river water; increasing sludge wasting was the most effectiveimprovement, but limited by solids handling facilities; and,evaluating the entire treatment plant to meet waterquality goals is essential. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

31

File Size:

1 file , 2.3 MB