Odor measurement is a useful tool in the evaluation of agricultural odor control methods. Subjective odor measurement techniques utilizing man's sense of smell as an analytical instrument are discussed. The use of these methods ineevaluating agricultural odor control systems is also reviewed. A dynamic dilution to threshold odor measurement method is used to evaluate odorous air samples collected downwind from an on farm agitated basin containing anaerobic liquid swine manure. Samples were collected from the time of agitator startup. It is found that short term surface aeration of anaerobic liquid swine manure reduces the threshold of the odorous gases being emitted by at least two orders of magnitude. It is shown that odor samples with a 'high odor level' in Tedlar (Polyvinyl Flouride Plastic) bags can be stored for 48 hours before threshold analysis without a significant change occurring in the odor threshold. It is found that odor samples with a 'low odor level'* collected in Tedlar bags have a likely storage life of at least 24 hours. * High odor lever is defined here as 5,000 to 10,000 dilutions to threshold. ** Low odor level is defined here as less than 500 dilutions to threshold. / Land and Food Systems, Faculty of / Graduate

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 152-157). Also available via the Internet.

Thesis (M. Sc.)--University of Hong Kong, 1993.

Thesis (M. Sc.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 74-79).

Kitchen waste compositing plants emit odorous gas streams with sulfur-, nitrogen-, and oxygen-containing compounds and other hydrocarbons. A pilot-scale biotrickling filter with a space of 0.3 m square and 1.0 m height packed with fern chips was used for removing the odorous components from the kitchen waste compositing gas. An average weight ratio of ¡§kitchen waste: bulking material: seeding compost¡¨ of 90:4.5:5.5 was used to prepare the compositing material for producing the odorous gas for test. The kitchen waste was composed of residual material from food preparation and meal wastes. The bulking material was either wood trimmings or dried leaves and the seeding material was a blend of manure and bird feather compost. Experiments indicate that the composting material could develop to 32-55 oC during a composting period of 6 weeks and the vented gas contained ammonia, amines, mercaptans, and hydrogen sulfide to maximum values of 700, 1,000, 53, and 1.0 ppm, respectively. A maximum odor concentration of 23,000 was obtained and the odor intensity was closely related to mercaptans in the vented gas. Results indicate that by using the bio-treated effluent of the school-owned domestic wastewater treatment plant as a supplemental water and nutrition sources for the biotrickling filter, 0.5-5 and 1-15 ppm of ammonia and amines, respectively, in the introduced odorous gas could completely be removed at conditions of empty-bed-retention-times (EBRT) of 15 s and liquid/gas flow ratio (L/G) of 0.003 m3/m3. Particularly, with an EBRT of 7 s at a fixed L/G of 0.002, 99.7% of odor intensity (dilution to the threshold ratio, DT) in the influent gas with a DT of 5,500 could be removed. Instead of effluent wastewater, by supplementing tap water with 25 mg/L of milk powder to the biotrickling filter, results indicate that with an EBRT of 7 s at a fixed L/G of 0.002, 99.7% of odor intensity in the influent gas with a DT of 13,000 could be removed. Milk powder supplementation gave better performance than the effluent wastewater one.

Thesis (Ph. D.)--Ohio State University, 1972. / Includes bibliographical references (leaves 177-185). Available online via OhioLINK's ETD Center

Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisors: Steven K. Dentel and Pei C. Chiu, Dept. of Civil & Environmental Engineering. Includes bibliographical references.

Thesis--University of Florida, 1971. / Description based on print version record. Manuscript copy. Vita. Bibliography: leaves 173-190.

Thesis (M.S.)--Oregon State University, 2005. / Printout. Includes bibliographical references (leaves 61-69). Also available on the World Wide Web.

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