Pilot Testing Microfilters and Cloth-Media Filters for Lake Augmentation

Microfiltration and cloth-media filtration were pilot tested for plant expansion and water supply augmentation purposes. The performance of the pilot units was assessed by evaluating key influent and effluent data, including suspended solids, turbidity, total phosphorous, hydraulic loading rate, flux, and chemical addition. Results showed that one of the cloth-media filters, and both of the microfiltration membranes tested could meet all forecasted requirements for augmentation, achieving lower than 0.5 mg/L total phosphorous on the cloth-media filter, and 0.3 mg/L on both microfilters. The microfiltration membranes were tested on both secondary effluent and filtered effluent. Sustainable flux rates on filtered effluent were approximately 40% higher than secondary effluent.