Characterization of leachate generation rate and greenhouse gas emissions from waste incineration

With increasing waste treatment volumes and rising incineration proportions, leachate production from waste incineration inevitably increases. As a high-concentration organic wastewater, its biological treatment generates greenhouse gases (GHGs). To date, few studies have been conducted on the generation rate of leachate and GHG emission characteristics, and GHG emission factors are not provided in the IPCC inventory, hindering both the calculation of total emissions and mitigation research. In this study, a leachate generation rate estimation formula (A = 18.21, B = −2.8, C = −3.7) was established based on measured emission factors and plant data, and then GHG emissions during leachate treatment were investigated. Results show significant spatial and temporal variations in leachate generation rates, with higher rates in summer and lower rates in spring and winter. N 2 O concentrations are significantly higher than atmospheric background levels, with N 2 O > CH 4 > CO 2 in terms of concentration differences. N 2 O and CH 4 emissions range from 2.93 g t −1 to 1146.56 g t −1 and 0.93 g t −1 to 137.83 g t −1 , with median values of 74.62 ± 12.78 g t −1 and 8.61 ± 0.49 g t −1 , respectively. Aeration adjustment significantly affects N 2 O emissions. CO 2 emissions from aeration account for 9.51% of N 2 O and CH 4 emissions. Positive correlations were observed between N 2 O emissions and both COD (chemical oxygen demand) and TN (total nitrogen) removal efficiencies, whereas a negative correlation existed with DO (dissolved oxygen) content. Similarly, CH 4 emissions exhibited positive associations with COD and TC (total carbon), while CO 2 emissions demonstrated positive correlations with TP (total phosphorus). 随着垃圾处理量及焚烧比例上升, 渗滤液产生量随之增加.渗滤液为高浓度有机废水, 其生物处理过程会释放温室气体 (GHG) .目前相关渗滤液产生率及温室气体排放特征研究较少, 且IPCC清单缺乏排放因子, 制约了GHG核算与减排研究.本研究基于实测数据排放因子, 建立渗滤液产生速率估算公式, 并分析渗滤液处理中的GHG排放特征.结果显示:渗滤液产生率时空差异显著, 夏季高于春,冬季.N 2 O浓度显著高于背景值, 浓度差异表现为N 2 O > CH 4 > CO 2 .N 2 O和CH 4 排放范围分别为2.93–1146.56 g t −1 和0.93–137.83 g t −1 .曝气调控对N 2 O排放影响明显.N 2 O排放与化学需氧量,总氮去除率正相关, 与溶解氧负相关;CH 4 排放与化学需氧量,总碳正相关;CO 2 排放与总磷正相关.