AWWA MTC61108

The City of Clovis, California constructed a state-of-the-art membrane water treatment facility to meet ever growing demands in the area. The plant has an initial rated capacity of 15 mgd facility (buildout at 45 mgd) and treats water from an irrigation canal operated by the Fresno Irrigation District. The City of Clovis has experienced rapid population growth in the last ten years. This growth put a strain on the existing water supply system, which came almost exclusively from groundwater. Despite its groundwater recharge program, increased demand of the available groundwater resources resulted in the continued drop in the water table to the point where growth was not sustainable. The plant uses membrane filtration, and also has pretreatment aimed at reducing color and organics. The City selected ballasted flocculation, which uses a polymer as part of its operations. Residuals handling facilities utilize a proprietary process that relies on sludge conditioning using a polymer and in-line hydraulic mixing-flocculating unit. This poster displays water quality and cost data used in developing the design of these facilities, and water quality and plant operating data through the first 6-9 months of operation of the treatment plant.