| Title: | "Importance of 2,4,6-Trichloroanisole (TCA) as an odorant in the emissions from anaerobically stabilized dewatered biosolids" |
| Author(s): | Barczak RJ; Fisher RM; Le-Minh N; Stuetz RM; |
| Address: | "Faculty of Building Services, Hydro and Environmental Engineering, Warsaw University of Technology, Poland; UNSW Water Research Centre, School of Civil and Environmental Engineering, UNSW, Sydney, Australia. Electronic address: r.barczak@unsw.edu.au. UNSW Water Research Centre, School of Civil and Environmental Engineering, UNSW, Sydney, Australia" |
| DOI: | 10.1016/j.chemosphere.2019.07.071 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Odours from stabilized biosolids after anaerobic digestion of wastewater sludge can cause local community impact. Apart from the well-known odorants such as sulfur compounds, contributions from other volatile organic compounds (VOCs) to nuisance odours is limited. The presence of compounds with low odour detection thresholds (ODTs) at low concentrations, can present challenges for analytical identification. Thirty-six biosolids samples were taken after anaerobic stabilisation and dewatering at a wastewater treatment plant, Sydney, Australia. Biosolid cake samples were stored outside in loosely covered trays under aerobic conditions, however without interactions with soil microorganisms as it would be in reality. All biosolids cake samples were analysed over a period of 35 days. Emissions were collected onto Tenax TA sorbent tubes using a U.S. EPA flux hood method at storage days 1, 3, 7, 10, 14, 21 and 35. Gas chromatography (GC) coupled with mass spectrometer detector (MSD) and an olfactory detection port (ODP) was used to identify a musty/moldy/earthy type odorant in the biosolids emissions as 2,4,6-trichloroanisole (TCA). Measured odour intensities, classified on a scale from 1 to 4, and odour characters were specified by three ODP assessors. TCA was identified in all biosolid cake emissions. The measured odour intensities of the TCA did not significantly alter as the biosolids were aged, however varied between biosolids cakes. Due to its odour intensity, 85% frequency of detection and its low ODT, which is orders of magnitudes lower than sulfur compounds, TCA should be considered as a potential odorant of concern in biosolids emissions" |
| Keywords: | "Anisoles/*analysis Australia Odorants/*analysis Sewage/*chemistry Soil Sulfur Compounds/analysis Volatile Organic Compounds/*analysis Waste Disposal, Fluid/*methods Earthy Gc-msd/odp Moldy Musty Odorants Odour Olfactory Wastewater treatment plants;" |
| Notes: | "MedlineBarczak, R J Fisher, R M Le-Minh, N Stuetz, R M eng England 2019/07/26 Chemosphere. 2019 Dec; 236:124340. doi: 10.1016/j.chemosphere.2019.07.071. Epub 2019 Jul 11" |
