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.
UNSW Water Research Centre, School of Civil and Environmental Engineering, UNSW, Sydney, Australia.
Chemosphere. 2019 Dec;236:124340. doi: 10.1016/j.chemosphere.2019.07.071. Epub 2019 Jul 11.
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.
经过废水污泥厌氧消化稳定化后的生物固体在分解时发出的气味会对当地社区产生影响。除了众所周知的硫化合物等气味剂外，其他挥发性有机化合物（VOC）对恶臭的贡献有限。在低浓度下，具有低气味检测阈值（ODT）的化合物的存在会对分析鉴定构成挑战。在澳大利亚悉尼的一家污水处理厂，对经过厌氧稳定化和脱水处理后的 36 个生物固体样本进行了采集。生物固体饼样本储存在露天的、覆盖松散的托盘内，处于需氧条件下，但与实际情况中土壤微生物的相互作用不同。所有生物固体饼样本在 35 天的时间内进行了分析。在储存第 1、3、7、10、14、21 和 35 天，使用美国环保署通量罩法，将排放物收集到 Tenax TA 吸附管上。气相色谱（GC）与质谱检测器（MSD）和嗅觉检测端口（ODP）联用，鉴定出生物固体排放物中一种发霉/泥土味的气味剂为 2,4,6-三氯苯甲醚（TCA）。三名 ODP 评估员对气味强度（分为 1 到 4 级）和气味特征进行了分类。在所有生物固体饼排放物中均检测到了 TCA。随着生物固体的老化，TCA 的测量气味强度没有明显变化，但在不同的生物固体饼之间存在差异。由于 TCA 的气味强度、85%的检测频率和其低 ODT（比硫化合物低几个数量级），TCA 应该被视为生物固体排放物中潜在的关注气味剂。
