Status of Research on Greenhouse Gas Emissions from Wastewater Collection Systems

Wastewater collection systems (WCSs) not only play an indispensable role in urban life but also significantly contribute to greenhouse gas (GHG) emissions. Based on extensive literature research, this study (1) summarizes current research the production mechanisms, influencing factors, control techniques, and quantitative estimates of GHGs emitted from WCSs (2) presents initial total GHG emissions China. A variety factors affect production, standard methods are still lacking quantify WCSs. China’s emit approximately 3.86–15.35 Mt CO2eq annually (equivalent 5.1–20.2% wastewater treatment). Thus, significant deserve attention. Control can be achieved through application chemical agents, while construction a green stormwater infrastructure further facilitate reductions. This review provides valuable insights for policymakers consider future policy planning related reduction improved operation Future should focus quantifying impacts various accumulating field data regions development standardized calculation methods.