Agricultural Engineering Research, Volume 07 (2001)

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Browsing Agricultural Engineering Research, Volume 07 (2001) by Person "Hartung, Eberhard"

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    Dynamics of Odour Release from a Pig House - Part 1

    Methodological Realization with Olfactometry and an ?EURoeElectronic Nose?EUR?

    (2001) Brose, Gregor; Hartung, Eberhard
    Due to varying operating conditions, odour emissions from pig houses are subject to large fluctuations. The appropriate selection of representa- tive sampling times as well as the more realistic calculation and evalua- tion of odour levels in ambient air requires more precise knowledge about the dynamics of odour emissions. The investigation programme of the presented project comprises the measurement of seasonal (fattening period), daytime-related, and short- term (feeding) dynamic effects of odour release as well as the identifica- tion of potential factors which influence the amount of odour emission. Parallel to “classic” olfactometry, an “electronic nose” with a chemo- sensor array of ten metal oxide sensors is used. Initial results clearly show the potential of “electronic noses” for the measurement of dynamic fluctuations in gas composition, which also includes odorants. In the second part, evaluation methods adapted to the problem will be used to determine possible connections between the sensor signals of the “electronic nose” and the odour concentrations analyzed by means of olfactometry.
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    Economic Evaluation of Biofilters
    (2001) Martinec, Milos; Hartung, Eberhard
    During studies on the optimization of biofilters for the reduction of odours from piggeries, two filter materials and different designs were tested parallel in a stall for fattening pigs. Measured mean odour reduc- tion amounted to 70 to 80%. Odour concentration in the waste air consti- tutes the main influencing factor for odour reduction. Sufficient material moisture in the entire volume of the filter material is an essential prereq- uisite for odours to be reduced significantly and as continuously as pos- sible. The use of coarsely structured materials such as biochips allows larger bulk heights and filter volume loads to be reached, which reduces the investment cost considerably. However, flow resistance and, hence, operating expenses for electricity, grow disproportionately. Therefore, these effects must be given special attention when designing a biofilter and calculating the resulting total cost.