This project was to compile and update the 2017 Taiwan National Greenhouse Gas Inventory of Waste Sector using the recommended methodologies in 2006 Intergovernmental Panel on Climate Change Guidelines for National Greenhouse Gas Inventories (IPCC 2006 Guidelines). The total emission of Waste Sector in 2017 was 3,978.5 kt-CO2 eq. Among the waste sector emissions, the largest contributor was industrial wastewater treatment accounting for 37.93%, followed by domestic wastewater treatment accounting for 36.95%, solid waste disposal accounting for 20.97 %, incineration of waste accounting for 3.18 %, and biological treatment of waste accounting for 0.97 %. Breakdown of emissions in 2017 by GHG showed that the largest contributor to the emissions was CH4 accounting for 88.5 %, followed by N2O accounting for 8.2 %, and CO2 accounting for 3.3 %. In addition to the National Greenhouse Gas Inventory updation of Waste Sector, other results of this project were as followed: 1.Evaluated and analyzed 7 National Inventory Report of Annex I parties in 2019 to understand and identify the latest international trends, emission characteristics, and focal points of inventory review reports. Furthermore, the European, the U.S., and Japan policies towards the circular economy, initiatives of biogas recovery and reusing, emission parameters, and other strategies and evaluation of achieving GHG emission reduction targets were also reviewed for developing Taiwan's waste management strategies. 2.Visited 5 domestic wastewater treatment plants that have the potential to biogas recovery to gather the real status of biogas treatment, and interpret the possibility and benefits for implementing biogas recovery. 3.Measured on-site GHG emissions of each wastewater treatment process in 4 paper factories, so as to establish the country-specific emission factors. Through analysis of measuring results, the emission factors of 4 paper factories in Taiwan were 1.55×10-3 kg CH4/kg COD and 4.00×10-5 kg N2O/kg-N (Weighted arithmetic mean). 4.Planed a prototype of biogas recovery and reporting procedures for wastewater treatment plants, including mission source review, facilities improvement, on-site spot check, rewards, offset project application, and etc. 5.Held 4 regional workshops to promote the concept of greenhouse gas reduction and benefits of biogas recovery, and issue questionnaires to collect real needs and suggestions from stakeholders. 6.Discussed the calculation rules and parameters for CH4 emission from unmanaged domestic wastewater, and CH4 emission from different treatment processes for industrial wastewater. 7.Implemented uncertainty analysis of waste sector emissions in 2017 using “propagation of error method” and “Monte Carlo method”, and analyze the uncertainty trend from 2015 to 2017. The uncertainty analysis results of Waste Sector total emission by Monte Carlo method will reduce 3.6 % negative deviation and 1.9 % positive deviation in comparative to propagation of error method. 8.Held 3 expert meetings to discuss the prototype of biogas recovery and reporting procedures for wastewater treatment plants, the suitable improvement items of National Greenhouse Gas Inventory of Waste Sector, and the rationality of country-specific wastewater treatment emission factors for the paper industry 9.Assisted Taiwan EPA to submit the related estimation to the National Greenhouse Gas Inventory platform, summarize results of Environment-related Action Plan, and cooperate with the committee of National Greenhouse Gas Inventory to conduct the relevant affairs.

Greenhouse gas, waste sector, national inventory report (NIR), localization emission parameter, CO2 emission reduction strategies