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THE INFLUENCE OF FILTRATION ON ULTRAVIOLET DISINFECTION OF SECONDARY EFFLUENT FOR MICROIRRIGATION
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2000
Year
FiltrationChemical EngineeringMicroirrigation SystemEngineeringDecontaminationEffluent DisposalEnvironmental EngineeringDisinfection UnitWater PurificationWater TreatmentDisinfection EfficiencyDisinfectantUv-c IrradiationDrinking Water TreatmentWastewater Treatment
A microirrigation system with an ultraviolet (UV) disinfection unit was operated under field conditions usingfiltered secondary effluent. Over a nine-month period the study was conducted in three phases with the filtered effluentexposed to an average UV dose of 100 mWs/cm 2 . The rate of filtration was reduced to improve disinfection in eachsubsequent phase. Three different emitter designs, automatic self flushing, continuous self flushing, and tortuous pathturbulent flow (all 4 L/h (1 gal/h), were tested . Media filtration was observed to remove significant amounts of suspendedsolids, to alter the particle size distribution of the secondary effluent, and to improve disinfection efficiency of UVradiation. Adequate filtration to remove particles greater than 40 m was deemed necessary for effective UV disinfectionto prevent clogging of the emitter types tested.