This powerpoint presentation outlines optimal treatment technology and design
considerations for small-scale treatment of
surface 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, DBP
precursor removal; and,
slight metals
removal. 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 by
microfiltration (Coagulation/MF);
ultrafiltration followed by
nanofiltration (UF/NF); and,
multi-media filtration followed
by 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.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 29 |
| Published : | 06/01/2007 |
