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A study on odor control by adding ferric or ferrous chloride was conducted at the Longmont Wastewater Treatment Plant, CO. Full scale addition of ferric chloride to the inlet wastewater and sludge just prior to the belt filter presses in July-October 2000 achieved excellent odor control but resulted in poor sludge settling in the gravity thickener and increased solids in the belt filter filtrate. A series of bench scale tests determined that both ferrous and ferric chloride performed similarly in removing sulfide from the wastewater but poorer sludge settling occurred at high ferric chloride (27 mg/L) doses. Full scale application of ferrous chloride to inlet wastewater (1-10 mg/L) reduced odor from the headworks through the primary clarifiers, but significant odor was still present. Dissolved sulfide measurements confirmed the benefits of ferrous addition. Full scale ferric application is currently underway in hopes of achieving better odor removal while avoiding operational upsets.
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Document Type: Research Article

Publication date: 2002-01-01

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