Past Phd Students

Intercomparison of headspace sampling methods coupled to TD-GC-MS/O to characterise key odorants from broiler chicken litter

By: Sashikala Maruthai Pillai

Supervisors : Prof Richard M Stuetz, Dr Gavin P Parcsi

Project summary: Since limited studies exist on the emissions of odours from tunnel ventilated broiler sheds under the Australian climate, this research study aims to determine the key odorants in the headspace of litter at ambient temperature across the poultry production cycle in two seasons (winter and summer) using headspace sampling coupled to TD-GC-MS/O analysis. Dynamic dilution olfactometry analysis was performed on litter odour samples. Analysis of litter odorant composition employing headspace sampling coupled to TD-GC-MS/O provided a greater understanding of the fate of odorants in the litter during bird growth cycle. The study also showed that characterise odorous volatiles can be correlated with dynamic dilution olfactometry responses. The results revealed that the odorous contributions were ketones, volatile fatty acids, sulfur and nitrogen compounds that were highly offensive substances, which impose significant effect on the odour annoyance from the emissions compared to other chemical functionalities. The assessment of activated carbon, silica gel and zeolite as a potential odour reducing strategy was directly applied to litters. The studies exhibited mixed trends in chemical and sensory responses and selectivity in reducing the volatilisation of odorants attributed to the efficacy of the additive itself, heterogeneous condition of litter particles in contact with the reduction materials and the exposed surface area.

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Chemical Analysis of Odorants from Poultry Facilities

By: Gavin Parcsi

Supervisors: R.M. Stuetz, S. Khan 

Project Summary: Population growth has increased pressures on primary producers, including poultry producers, to competitively produce greater amounts of produce, whilst reducing environmental impact. Additional rural encroachment has substantially reduced the distance between primary producers and neighbouring properties, yielding increased odour related complaints. This research project aims to improve understanding of the emission of odorous compounds from poultry facilities by benchmarking analytical methodologies. In particular this thesis focuses on methodologies for speciation of Non-Methane Volatile Organic Compound (NMVOC) and odorant emissions from mechanically ventilated poultry houses in Australia

Click here for the elink to Gavin's phd in UNSW library