ODOR CONTROL TECHNOLOGIES AT POTWS AND RELATED INDUSTRIAL ANDAGRICULTURAL FACILITIES

摘要

This paper provides a summary and assessment of literature findings on odor control strategiesrnand technologies implemented at publicly-owned treatment works (POTWs), as well as viablernand innovative odor control strategies and approaches used at industrial and agricultural facilitiesrnthat could be applicable to POTWs. This effort of assessing literature on odor control approachesrnis part of a Water Environment Research Foundation (WERF)-sponsored larger study that isrnfocussed on odor identification and characterization, odor sampling and measurementrnapproaches and methods, as well as odor control strategies and technologies within POTWs andrncollection systems and within related agricultural and industrial facilities. The WERF-sponsoredrnstudy is currently being undertaken by Los Angeles County Sanitation Districts andrnCH2M HILL.rnLiterature findings on odor control at POTWs within the past ten years show that odor controlrnapproaches currently in use in collection systems include mainly chemical addition and oxygenrnaddition, with fewer applications of gas phase odor control. Odor control technologies currentlyrnin use at POTWs include mainly biofilters, dry scrubbers, wet scrubbers, and thermal oxidationrnusing regenerative thermal oxidizers, recuperative thermal oxidizers, catalytic thermal oxidizersrnand/or waste gas flares.rnOne key finding on odor control approaches at POTWs show that most current work is focusedrnon H2S and H2S odor control units. There is a lack of information on concentration ranges andrnremoval efficiencies for compounds such as dimethyl disulfide, methyl mercaptan, and methylrnamines. Also, while removal performance for H2S is typically good, removal of other organicrncompounds varies depending on the technology used.rnThis paper also presents literature findings on innovative odor control approaches applicable tornPOTWs, as well as applicable odor control approaches from industrial and agricultural facilities.