AWWA MTC64557

The objectives of this research are to compare chemical and electrocoagulation pretreatment options for microfiltration in terms of: reduction in microfilter fouling; enhancements in micro-filtered water quality (in terms of natural organic matter and disinfection byproduct precursors); and, reduction in nanofiltration (NF) membrane fouling in case of integrated membrane systems. The combination of coagulation and microfiltration (MF) or ultrafiltration (UF) has been suggested as an effective means to maintain high permeate flux, reduce microfilter fouling, and provide high quality product water. Conducting chemical coagulation (CC) with aluminum or iron salts is a common pretreatment option; however, electrocoagulation (EC) is another emerging technology. The advantages of electrocoagulation over chemical coagulation include: no alkalinity consumption; no change in pH; eliminates the need to store and feed highly corrosive chemicals; produces lesser sludge; and, can be easily scaled for portable water treatment units especially during use in emergency situations. Therefore, a study was undertaken to explore the option of coupling electrocoagulation as a pretreatment process for surface water microfiltration. Includes 4 references.