PILOT-SCALE MICROFILTRATION AT MANITOWOC

Microfiltration of Lake Michigan Water for the production of drinking water was investigated using a 60 GPM Memcor micro filtration pilot pl ant for nine months at Manitowoc WI. The performance characteristics o f a microfiltration pilot plant for varying surface water conditions w ere analyzed and modeled. Statistical regression was used to determine and develop quantitative relationships between time of operation and several operational variables for water quality and productivity. Dire ct filtration of a alum pretreated feed water was found to greatly inc rease time of operation between cleanings for temperatures below 48 de grees F. The investigation found the turbidity and particle counts of the microfiltered water was less than the same for the finished water produced by the conventional alum coagulation, sedimentation and filtr ation process. Cleaning frequencies of 21 or more were predicted. Base d on the results of this investigation, a recommendation was made to u se microfiltration as the treatment process of choice for the treatmen t of Lake Michigan Water.