APPLICATION OF CHLORAMINES FOR REUSE WATER DISINFECTION AT THE CITY OF LAS VEGAS WATER POLLUTION CONTROL FACILITY

摘要

This study evaluates the application of chloramines to disinfect the reuse effluentrnproduced by the City of Las Vegas Water Pollution Control Facility (WPCF) to irrigaterngolf courses. Although the current chlorination process consistently meets the totalrncoliform standard, it results in high costs associated with chemical consumption.rnLaboratory and field tests were performed using filtered effluent from the WPCF. Testsrnincluded chlorine demand determination, chloramination tests, and disinfection tests.rnThe chlorine demand of the treated wastewater was found to be 3.0 mg/L. Bestrnmonochloramine formation was accomplished when a 3.5:1 chlorine-to-ammonia ratiornwas applied. A 4:1 chlorine-to-ammonia ratio (ammonia dosage of 1.0 mg/L) resulted inrn100% removal of total coliform. A cost estimate indicated that the chloraminationrnprocess would result in a 48% reduction in the current chemical cost.