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OXIDATIVE REGENERATION OF IRON FOR TREATMENT PLANT PURPOSES

ABSTRACT

The Orange County Sanitation Districts (OCSD) currently utilize PRI-SCTMtechnology to control hydrogen sulfide emissions within its collection system. With PRI-SC, ferrous chloride (FeCl2) is added for sulfide control and then the combined iron is regenerated using hydrogen peroxide (H2O2). OCSD also adds ferric chloride (FeCl3) at its treatment plants to enhance solids separation (CEPT). We previously reported on the improved sulfide control efficiencies in the collection system using PRI-SC; however, little data were available at the time on regenerating that iron a second time (at the treatment plant) to benefit CEPT. This paper discusses the economic and performance benefits of doing so using hydrogen peroxide and bleach at OCSD Plant No. 2. The study involved beaker tests, jar tests and field trials, as well as an analysis of the historical plant records.

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Download OCSD PRI-CEPT – WEFTEC 2005 (pdf)

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