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This paper presents a case study of Ozone (O3) to oxidize hydrogen sulfide (H2S) from supply wells of Seminole County Markham Regional Water Treatment Plant (MRWTP). H2S, is now regulated by FDEP, and can lead to taste and odor complaints in the distribution
system. Ozone oxidation was selected by the County as the preferred treatment process to oxidize H2S from the groundwater supply wells which will reduce the amount of applied chlorine in an effort to reduce Trihalomethanes (THM) formation. On-site pilot-scale ozone testing was
performed to confirm design specifications, and to demonstrate whether the water quality compliance goals to reduce sulfide and control disinfection by-products (DBPs) can be achieved. The followings were the results of the ozone pilot-scale testing: Verified
the bench-scale testing results (AECOM, 2008) and found that ozone dose is dependent on sulfide concentration with an Ozone to hydrogen sulfide demand ratio (O3:H2S) 3.9:1 to 4.4:1. Low O3 residuals (<0.5 mg/L) dissipated
to less than 0.1 mg/L in 5 to 10 minutes. High O3 residuals (>1.0 mg/L) dissipated to less than 0.1 mg/L in 15 to 20 minutes. Formation of bromate was instantaneous and increased with increasing bromide
and ozone residuals. THM formation was dependent upon source water bromide concentration. Oxidation reduction potential (ORP) was identified as being successful in being able to control ozone residual.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.