Atmospheric CH4 concentration in a WWTP and different urban zones

This dataset shows the results of atmospheric CH4 concentration (ppm) sampled inside and around a wastewater treatment plant (WWTP), a fixed source immersed in an urban area, and in two urban zones with different urban densities in Tandil city (Argentina). The study period was one year, from July 2018 to June 2019, with 11 transects in the WWTP and seven transects in each urban zone. The sampling methodology was simple and inexpensive, which allowed collecting air samples in urban areas using syringes with a three-way stopcock. The samples were analyzed for CH4 concentration by gas chromatography (CG Agilent 7890A). Furthermore, during the sampling on each transect, air temperature, atmospheric pressure, relative humidity, upwind direction, mean wind, and gust intensity were recorded. The results allowed us to assess the WWTP contribution to atmospheric CH4 concentration and, applying the inverse Gaussian model, it was possible to estimate the CH4 emission rate from the source.

本数据集展示了在污水处理厂（WWTP）内部及其周边地区，以及阿根廷坦迪尔市两个不同城市密度区域的空气中甲烷浓度（ppm）的采样结果。该研究周期为一年，自2018年7月至2019年6月，共在污水处理厂设置11个样线，在每座城市区域设置7个样线。采样方法简便且成本较低，允许使用带有三通阀的注射器在城市区域采集空气样本。样本通过气相色谱法（CG Agilent 7890A）进行分析，以测定甲烷浓度。此外，在每条样线的采样过程中，记录了空气温度、大气压力、相对湿度、上风方向、平均风速和阵风强度。这些结果使我们能够评估污水处理厂对大气甲烷浓度的贡献，并运用逆高斯模型，估算源自该地点的甲烷排放速率。