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The recent testing and commissioning of the odor control system for a new biosolids facility at Toronto's Ashbridges Bay Treatment Plant demonstrated excellent control of organic sulfides through two-stage chemical scrubbing. Testing used bottled gas to spike the inlet air.

Sampling of existing biosolids air exhaust streams showed that several organic sulfides were present in concentrations that would likely be the predominant control parameters. For example, using gas chromatograph/flame photometric detection (GC/FPD) analysis, dimethyl sulfide was detected in the existing sludge hopper's exhaust air at a peak concentration of 74 parts per million (ppm), dimethyl disulfide at 43 ppm, and methyl mercaptan at 6 ppm.

There is limited historical data on organic sulfide control in packed-bed chemical scrubbers. Manufacturers are reluctant to guarantee performance or will quote nominal removal. Review of the literature determined that control of the most frequently detected organic sulfides (methyl mercaptan, dimethyl sulfide, dimethyl disulfide) between 50 and 80 percent was achievable with single-stage scrubbing.

The Ashbridges Bay odor control system was designed and constructed with two-stage packed bed chemical scrubbing followed by biofiltration. Biofiltration was included for additional treatment of organic odors and to enable operation with reduced chemical consumption during the low-odor periods.

The paper describes the design and performance testing of the chemical scrubber system. The paper also discusses the synergy of using chemical scrubbers and biofilters in series.
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Document Type: Research Article

Publication date: 01 January 2002

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