This slide presentation outlines natural organic matter (NOM) membrane fouling and its removal to reduce disinfection byproduct formation. Major types of NOM are outlined along with the three primary means used to control
fouling in low pressure membrane filtration. Three case studies are outlined that consisted of pilot
evaluations at three locations designed
to test various techniques for the
control of membrane fouling and the
reduction of byproduct formation in
membrane filtration systems. Because of the high solids loading, only
outside-in flow configurations were
piloted. The three case studies were located in Abilene, Wichita Falls, and Sherman, Texas. The first case study in Abilene, Texas focused on evaluating color and total organic carbon
(TOC) removal without clarification. The outcome demonstrated that
both systems met organic removal
goals using direct filtration (no clarifier), and
high doses of coagulant did not
significantly improve performance over
moderate dosages. The second case study in
Wichita Falls focused on comparing
coagulation and
coagulation/sedimentation. The outcome demonstrated that high solids and organic levels in
the Wichita Falls water source required
flocculation AND clarification prior to
the low pressure membranes,
chemical wash appeared to improve
performance, and
solids and organic loadings were still
problematic for one supplier. The third case in Sherman, Texas focused on comparing
coagulation and chemical washing. The outcome demonstrated that
both fouling management approaches
were successful in achieving the
required 30-day CIP interval, and
chemical wash provided better
economics. Pilot process flow diagrams are given for each case study, along with pilot results and cost evaluations. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 40 |
| Published : | 06/01/2006 |
