The project had the following major objectives: - Identification of technologies to reduce offens... more The project had the following major objectives: - Identification of technologies to reduce offensive odour emissions from intensive animal operations; - Development of an efficient biofilter system to reduce odour emissions from animal housing and waste treatment facilities; - Identifying best practice in terms of media selection and biofilter design; and - Identifying how biofilters should be implemented at existing operations to achieve maximum air quality improvement with minimal expense and disruption.
Malodorous emissions are an inevitable part of intensive livestock production. Emissions fluctuat... more Malodorous emissions are an inevitable part of intensive livestock production. Emissions fluctuate and their impacts are subject to the surrounding topography and the vagaries of the weather. When handling odour complaints, regulatory authorities are often faced with the dilemma of assessing situations after the fact and without any supporting data. Recent developments in electronic nose technology have enabled continuous in-shed measurement of odour in broiler sheds which can help identify periods of elevated odour concentration (odour spikes). The issue then is to determine what causes these odour spikes. Increased flock activity is one possible cause. This paper examines the concept of using machine vision-derived activity indices to help characterise these odour spikes and delineate between normal odour emission levels and emissions directly attributable to increased flock activity. The implication of these findings is that odour control should include monitoring flock activity ...
2011 Seventh International Conference on Intelligent Sensors, Sensor Networks and Information Processing, 2011
Continued population growth, expansion of poultry production and urban encroachment has resulted ... more Continued population growth, expansion of poultry production and urban encroachment has resulted in increased odour complaints from local residents. Odour management has typically been based on buffer distances, however poultry expansion now requires accurate and reliable odour monitoring data for setting-up new broiler sheds and enlarging existing farms. Current olfactory and chemical based methods do not provide effective real-time monitoring,
Odour emission rates were measured from nine tunnel-ventilated broiler farms in south-eastern Que... more Odour emission rates were measured from nine tunnel-ventilated broiler farms in south-eastern Queensland, Australia. At one farm, odour emission rates were measured over two sequential batches approximately weekly, while at the remaining farms, odour emission rates were measured just before the first pickup (around Day 35 of the batch) when bird liveweight was greatest and peak odour emission rates were expected. Odour samples were analysed using dynamic olfactometry (to AS/NZS 4323.3:2001), and an artificial olfaction system was used to continuously monitor odour emission rates at one farm. Odour emission rates ranged from 330 to 2960 ou/s per 1000 birds and from 0.19 to 2.12 ou/s.kg, with a significant amount of variability observed throughout the batch and throughout each sampling day. While the wide range in odour emission rates was primarily due to changes in bird liveweight and ventilation requirements, other factors were also involved. The artificial olfaction system proved u...
Odour and non-methane volatile organic compound (NMVOC) emissions were assessed over the complete... more Odour and non-methane volatile organic compound (NMVOC) emissions were assessed over the complete production cycles at two tunnel ventilated broiler farms in Australia. A real-time odour monitoring system, i.e. artificial olfaction system, was used to measure in-shed odour concentrations and, when combined with ventilation rate data, provided continuous odour emission measurements. NMVOC composition of poultry odour samples was analysed using gas chromatography-mass spectrometry-olfactometry combined with a range of sample collection/pre-concentration methods. NMVOC results were then examined to establish which chemical species were the key odorants. Volatile organic compounds identified within the emissions included alcohols, aldehydes, ketones, carboxylic acids and terpines. Air quality, based on odour and NMVOC in the broiler sheds, was found to vary significantly between farms due to numerous management and environmental factors. Consequently, the development of a general emissi...
Water science and technology : a journal of the International Association on Water Pollution Research, 2004
A novel laboratory wind tunnel, with the capability to control factors such as air flow-rate, was... more A novel laboratory wind tunnel, with the capability to control factors such as air flow-rate, was developed to measure the kinetics of odour emissions from liquid effluent. The tunnel allows the emission of odours and other volatiles under an atmospheric transport system similar to ambient conditions. Sensors for wind speed, temperature and humidity were installed and calibrated. To calibrate the wind tunnel, trials were performed to determine the gas recovery efficiency under different air flow-rates (ranging from 0.001 to 0.028m3/s) and gas supply rates (ranging from 2.5 to 10.0 L/min) using a standard CO gas mixture. The results have shown gas recovery efficiencies ranging from 61.7 to 106.8%, while the average result from the trials was 81.14%. From statistical analysis, it was observed that the highest, most reliable gas recovery efficiency of the tunnel was 88.9%. The values of air flow-rate and gas supply rate corresponding to the highest gas recovery efficiency were 0.028 m3...
The project had the following major objectives: - Identification of technologies to reduce offens... more The project had the following major objectives: - Identification of technologies to reduce offensive odour emissions from intensive animal operations; - Development of an efficient biofilter system to reduce odour emissions from animal housing and waste treatment facilities; - Identifying best practice in terms of media selection and biofilter design; and - Identifying how biofilters should be implemented at existing operations to achieve maximum air quality improvement with minimal expense and disruption.
Malodorous emissions are an inevitable part of intensive livestock production. Emissions fluctuat... more Malodorous emissions are an inevitable part of intensive livestock production. Emissions fluctuate and their impacts are subject to the surrounding topography and the vagaries of the weather. When handling odour complaints, regulatory authorities are often faced with the dilemma of assessing situations after the fact and without any supporting data. Recent developments in electronic nose technology have enabled continuous in-shed measurement of odour in broiler sheds which can help identify periods of elevated odour concentration (odour spikes). The issue then is to determine what causes these odour spikes. Increased flock activity is one possible cause. This paper examines the concept of using machine vision-derived activity indices to help characterise these odour spikes and delineate between normal odour emission levels and emissions directly attributable to increased flock activity. The implication of these findings is that odour control should include monitoring flock activity ...
2011 Seventh International Conference on Intelligent Sensors, Sensor Networks and Information Processing, 2011
Continued population growth, expansion of poultry production and urban encroachment has resulted ... more Continued population growth, expansion of poultry production and urban encroachment has resulted in increased odour complaints from local residents. Odour management has typically been based on buffer distances, however poultry expansion now requires accurate and reliable odour monitoring data for setting-up new broiler sheds and enlarging existing farms. Current olfactory and chemical based methods do not provide effective real-time monitoring,
Odour emission rates were measured from nine tunnel-ventilated broiler farms in south-eastern Que... more Odour emission rates were measured from nine tunnel-ventilated broiler farms in south-eastern Queensland, Australia. At one farm, odour emission rates were measured over two sequential batches approximately weekly, while at the remaining farms, odour emission rates were measured just before the first pickup (around Day 35 of the batch) when bird liveweight was greatest and peak odour emission rates were expected. Odour samples were analysed using dynamic olfactometry (to AS/NZS 4323.3:2001), and an artificial olfaction system was used to continuously monitor odour emission rates at one farm. Odour emission rates ranged from 330 to 2960 ou/s per 1000 birds and from 0.19 to 2.12 ou/s.kg, with a significant amount of variability observed throughout the batch and throughout each sampling day. While the wide range in odour emission rates was primarily due to changes in bird liveweight and ventilation requirements, other factors were also involved. The artificial olfaction system proved u...
Odour and non-methane volatile organic compound (NMVOC) emissions were assessed over the complete... more Odour and non-methane volatile organic compound (NMVOC) emissions were assessed over the complete production cycles at two tunnel ventilated broiler farms in Australia. A real-time odour monitoring system, i.e. artificial olfaction system, was used to measure in-shed odour concentrations and, when combined with ventilation rate data, provided continuous odour emission measurements. NMVOC composition of poultry odour samples was analysed using gas chromatography-mass spectrometry-olfactometry combined with a range of sample collection/pre-concentration methods. NMVOC results were then examined to establish which chemical species were the key odorants. Volatile organic compounds identified within the emissions included alcohols, aldehydes, ketones, carboxylic acids and terpines. Air quality, based on odour and NMVOC in the broiler sheds, was found to vary significantly between farms due to numerous management and environmental factors. Consequently, the development of a general emissi...
Water science and technology : a journal of the International Association on Water Pollution Research, 2004
A novel laboratory wind tunnel, with the capability to control factors such as air flow-rate, was... more A novel laboratory wind tunnel, with the capability to control factors such as air flow-rate, was developed to measure the kinetics of odour emissions from liquid effluent. The tunnel allows the emission of odours and other volatiles under an atmospheric transport system similar to ambient conditions. Sensors for wind speed, temperature and humidity were installed and calibrated. To calibrate the wind tunnel, trials were performed to determine the gas recovery efficiency under different air flow-rates (ranging from 0.001 to 0.028m3/s) and gas supply rates (ranging from 2.5 to 10.0 L/min) using a standard CO gas mixture. The results have shown gas recovery efficiencies ranging from 61.7 to 106.8%, while the average result from the trials was 81.14%. From statistical analysis, it was observed that the highest, most reliable gas recovery efficiency of the tunnel was 88.9%. The values of air flow-rate and gas supply rate corresponding to the highest gas recovery efficiency were 0.028 m3...
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Papers by Jae Ho Sohn