The application of numeric modelling for determining the impact of landfills needs for reliable emission source data. In this study, a methodology for the characterization of the emission profiles of the different sources present in landfills for emission factors determination, applying an indirect methodology, is presented. Ambient air concentrations of volatile organic compounds (VOCs), hydrogen sulphide (HS) and ammonia (NH) were determined in three potentially emission sources in Can Mata landfill (Hostalets de Pierola, Catalonia, Spain): dumping areas, pre-closed zone and leachate reservoir as well as in biogas, for the determination of emission factors. Multi-sorbent bed and Tenax TA tubes were used for a wide range of VOCs sampling, and analysis was conducted through TD-GC/MS. HS and NH were sampled and analysed using Radiello passive samplers. The highest total VOC (TVOC) concentrations were found in dumping areas (0.7–3.5 mg m), followed by leachate reservoir (0.3–0.6 mg m) and pre-closed area (77–165 μg m). On the other hand, the highest HS and NH concentrations were found in leachate reservoir, presenting values of 0.8–1.1 mg m and 1.7–1.8 mg m, respectively. With the application of odour thresholds to the concentrations obtained, the most critical compounds regarding odour annoyances were determined. The highest odour units (O.U.) were found in leachate reservoir due to HS concentrations, whereas VOCs contributed mainly to O.U. in the dumping areas. The obtained ambient air concentrations were used for the indirect determination of the emission factors through numerical modelling using a Eulerian dispersion model. The emission factors obtained for the landfill for TVOC, HS and NH were in the range of 0.44–10.9 g s-1, 0.16–1.02 g s and 0.23–1.82 g s, respectively, depending on the emission source. Reliable emission factors are crucial to obtain landfill impact maps, which are essential for the correct management of these facilities.

中文翻译：

---

通过逆向方法确定垃圾填埋场的排放因子：环境空气浓度的实验确定和数值模型的使用

应用数值模型确定垃圾填埋场的影响需要可靠的排放源数据。在这项研究中，提出了一种应用间接方法来表征垃圾填埋场中不同来源的排放概况的方法，以确定排放因子。在 Can Mata 垃圾填埋场（西班牙加泰罗尼亚 Hostalets de Pierola）的三个潜在排放源中测定了环境空气中挥发性有机化合物 (VOC)、硫化氢 (HS) 和氨 (NH) 的浓度：倾倒区、预封闭区和渗滤液库以及沼气中，用于确定排放因子。使用多吸附剂床和 Tenax TA 管对多种 VOC 进行采样，并通过 TD-GC/MS 进行分析。使用 Radiello 被动采样器对 HS 和 NH 进行采样和分析。总VOC（TVOC）浓度最高的是倾倒区（0.7-3.5 mg m），其次是渗滤液库（0.3-0.6 mg m）和预封闭区（77-165 mg m）。另一方面，渗滤液库中 H2S 和 NH 浓度最高，分别为 0.8-1.1 mg m 和 1.7-1.8 mg m。通过将气味阈值应用于所获得的浓度，确定了与气味烦恼相关的最关键的化合物。由于 H2S 浓度，渗滤液库中的臭气单位 (OU) 最高，而挥发性有机化合物主要是倾倒区的臭气单位 (OU)。获得的环境空气浓度用于通过使用欧拉分散模型的数值建模来间接确定排放因子。根据排放源的不同，垃圾填埋场的 TVOC、H2S 和 NH 排放因子分别在 0.44–10.9 g s-1、0.16–1.02 g s 和 0.23–1.82 g s 范围内。可靠的排放因子对于获得垃圾填埋场影响图至关重要，而垃圾填埋场影响图对于这些设施的正确管理至关重要。