AWWA ACE65322

This powerpoint presentation outlines optimal treatment technology and designconsiderations for small-scale treatment ofsurface water with elevated organic loading at the town of Mahone Bay. Background information presented includes: 1,000 residents;surface water source - Oakland Lake;aging existing treatment infrastructure, packaged coagulation, flocculation, filtration; and,challenging water quality, elevated disinfection byproducts (DBPs). Statistics for raw water quality are provided, along with treatment objectives that include: pathogen removal;total organic carbon (TOC), color, DBPprecursor removal; and, slight metalsremoval. Candidate processes for TOC removal included:conventional coagulation, flocculation,sedimentation, filtration;solids contact clarifier;dissolved air flotation (DAF); and,membranes - preferred option. Pilot testing evaluated three membrane processes that included:coagulation followed bymicrofiltration (Coagulation/MF);ultrafiltration followed bynanofiltration (UF/NF); and,multi-media filtration followedby nanofiltration (MMF/NF). Design evaluation included:cost, capital vs operational;treated water quality, DBP formation potential;environmental impacts,residuals formation, required treatment, energy;operational complexity,mechanical vs chemical process; and,regulatory implications,redundancy, log removal credit. Cost estimates are provided along with pilot results, operational summary, residuals formation, operational complexity, membrane regulatory implications, and decision evaluation criteria.

Product Details

Edition:

Vol. - No.

Published:

06/01/2007

Number of Pages:

29

File Size:

1 file , 2.2 MB