An Investigation of Odors and Volatile Organic Compounds Released during Composting

Area of Science:

• Environmental Science
• Waste Management
• Analytical Chemistry

Background:

• Commercial composting facilities generate odors and volatile organic compounds (VOCs).
• Understanding these emissions is crucial for managing environmental impact and public perception.

Purpose of the Study:

• To investigate the odors and VOC emissions from a laboratory-scale commercial composting system.
• To correlate odor intensity with specific chemical compounds and identify major emission periods.

Main Methods:

• Laboratory-scale composting system with controlled aeration.
• Monitoring of composting temperature and respiratory rate.
• Odor assessment using the dilution-to-threshold method.
• Gas composition analysis via gas chromatography-mass spectrometry (GC-MS).

Main Results:

• A correlation exists between VOC release and odor perception, but identifying specific odorants is complex.
• Sulfurous and nitrogenous compounds are suggested as sources of offensive odors, despite low concentrations.
• Peak VOC emissions occurred within the first two weeks of composting, declining as the process matured.

Conclusions:

• Offensive odors in commercial composting are likely linked to specific sulfurous and nitrogenous compounds.
• VOC emissions are highest during the early stages of composting.
• Further research is needed to precisely link specific chemical species to offensive odor profiles.