APPROACHES FOR VALIDATING AND APPROVING DOSE MONITORING WITHUV DISINFECTION SYSTEMS FOR DRINKING WATER APPLICATIONS

摘要

Four approaches for dose monitoring with UV disinfection systems are described. The firstrnapproach uses alarm setpoint values of flow, UVT, and relative lamp output. The secondrnapproach uses alarm setpoints of flow and UV intensity. The third uses empirical equations,rncalibrated using validation data, that given RED as a function of flow, UVT, lamp status, andrnrelative lamp output. The forth uses empirical equations, calibrated using validation datarnobtained at a default UVT, that given RED as a function of measured flow and UVT. Testrnconditions needed to validate each approach is given with examples. Application of thernvalidation data for sizing the UV system and operation at the water treatment plant (WTP) isrndescribed including the approaches for operation outside the validated range. QA/QC duringrnvalidation and operation at the WTP is described to ensure validation and dose monitoring isrnmeaningful. A two-step process is described for approving the validation report and thernapplication of that report with a given UV installation.