This research focused on testing different coagulation pretreatment techniques
to improve membrane filtration in water separations, namely ultrafiltration (UF). These
three techniques were: conventional coagulation; forming a dynamic, or secondary,
coagulant-based layer on the membrane; and, injecting the coagulant into the feed line
so that it runs inline with the raw water across the membrane. Results showed that the
dynamic membrane's mode of operation achieved higher steady state flux values than
UF alone and than conventional coagulation pretreatment ahead of UF, while in-line
coagulation displayed the worst flux decline. UF alone was ineffective in removing
solids and dissolved organic carbon (DOC), while conventional coagulation and
dynamic UF modes rejected solids and DOC at similar rates. Through membrane
autopsies, irreversible fouling measurements for the dynamic membrane mode were
significantly lower than for the conventional coagulation mode. Thus, a coagulant-based
dynamic membrane has the potential to be an effective method to improve UF
efficiency in water separation applications as well as to decrease pretreatment costs
associated with operation. Upon reduction of associated costs, membranes can also
become competitive in advanced wastewater treatment and water reuse processes. Includes 18 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 420 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 12 |
| Published : | 03/01/2005 |
