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FRDM LAICFRISTINA Fq7( N0. :6505089688 Jan. 28 2003 06:43PM P3 B 1.2 IlWyelod"r ow, LmelwxmWlm.Aw i 20D2 RECYCLED WATER TASK FORCE SECOND MEETING June 3, 2002, 2:00 to 5:00 pm Mamuttan Beach Marriott Hotel Science and •a1 h grpuo Presentation and Discussions (3:15 -4:15 pm) b r #Takashi Assno -�~ Department of Civil and Environmental Engineering University of California, Davis Wastewater reclamation, recycting and reuse Water reuse accomplishes two fundamental functions: (1) the treated effluent is used as a water resource for beneficial purposes, and (2) the effluent is kept out of streams, lakes. and beaches; thus, reducing pollution of surface water and groundwater. The foundation of water reuse is built upon thus principles: (1) providing reliable treatment of wastewater to meet strict water quality requirements for the intended reuse application, (2) protecting public health, and (3) gaining public acceptance. Whether water reuse is appropriate fbr a specific locale depends upon careful economic considerations, potential uses for the reclaimed water, and the relative stringency of waste discharge requirements. Public policies can be implemented that promote water conservation and reuse rather than the costly development of additional water resources with considerable environmental expenditures. Through integrated water resources planning, the use of reclaimed water may provide sufficient flexibility to allow a water agency to respond to short -teen needs as well as iucroase the reliability of loar-torm water supplies. In the planting and implornentatian of water reuse, the intended water reuse applications govern the degree of wastewater raeatment required and the reliability of wastewater tn:aunent processing and operation, In principle, wastewater or any marginal quality watrs can be used for any purpo::e as long as adequate treatment is provided to moot the water quality requirements for thy: intended use. The dominant applications for the use of reclaimed water include: agricutr" irrigation, landscape irrigation, industrial recycling ind reuse, end groundwater recharge. Among them, agricultural and landscape irrigation are widely practiced throughout the world with well-established health protection guidelines and agonomic practices. Irrigation uses constitute approximately 80 percent of water reuse in California. Spectrum of reclaimed water quality As water is used for various applications. the quality changes due to introduction of various constituents. A conceptual comparison of the extent to which water quality