Wastewater treatment (WWT) is applied for environmental protection and water reclamation. However, this activity has been identified as a source of methane (CH₄), contributing to climate change. WWT (municipal and industrial) is estimated to produce 8 to 11% to overall CH₄ emissions. In order to apply effective mitigation strategies in the water sector, a more precise inventory of CH₄ emission should be accomplished. The application of the Tier 1 methodology in the Guidelines for National Greenhouse Gas Inventories of the Intergovernmental Panel on Climate Change (IPCC) results in rough estimations, as default emission factors are used. An effort should be done for determining actual emission factors for the more representative treatment processes in a given region or country. In this work, a detailed inventory of CH₄ emissions form municipal wastewater management in Mexico was obtained, based on the Tier 1 IPCC methodology. In addition, on-site CH₄ emission measurements in five stabilization ponds (SP) were realized. The total CH₄ emissions generated by municipal WWT in Mexico were 600.4 Gigagrams (Gg) for year 2010. Also, the IPCC (theoretical) estimations showed that CH₄ emissions were overestimated if compared with the results obtained in the five sampled facilities. The on-site emission factors obtained showed wide variation as they are specific to each sampled system and to their particular environmental and operating conditions. In Mexico, the value of 0.431 kg CH₄/kg BOD removed (0.110 kg CH₄/m³ treated water) may be used for SP with good operational practices.

废水处理（WWT）用于环境保护和水回收。但是，这种活动已被确定为甲烷（CH ₄）的来源，导致了气候变化。据估计，WWT（市政和工业用水）占CH ₄排放总量的8％至11％。为了在水务领域应用有效的缓解策略，需要更精确的CH ₄清单。发射应该完成。政府间气候变化专门委员会（IPCC）的《国家温室气体清单指南》中方法1的应用导致了粗略的估算，因为使用了默认排放因子。应该努力确定给定区域或国家中更具代表性的处理过程的实际排放因子。在这项工作中，基于方法1的IPCC，获得了墨西哥市政废水管理中CH ₄排放的详细清单。此外，还实现了在五个稳定池（SP）中的现场CH ₄排放测量。总CH ₄墨西哥市政污水处理厂在2010年的排放量为600.4千兆克（Gg）。此外，IPCC（理论上）的估计表明，与在五个采样设施中获得的结果相比，CH ₄排放量被高估了。获得的现场排放因子显示出很大的差异，因为它们特定于每个采样系统以及特定的环境和操作条件。在墨西哥，通过良好操作规范，可以将去除的0.431 kg CH ₄ / kg BOD（0.110 kg CH ₄ / m ³处理水）的值用于SP。