Department of Waste and Resource Management, Leichtweiß-Institute for Hydraulic Engineering and Water Resources, Technische Universität Braunschweig, Braunschweig, Germany.
Waste Manag. 2013 Oct;33(10):2099-107. doi: 10.1016/j.wasman.2013.01.028. Epub 2013 Feb 28.
Mechanical biological treatment (MBT) is an effective technique, which removes organic carbon from municipal solid waste (MSW) prior to deposition. Thereby, methane (CH4) production in the landfill is strongly mitigated. However, direct measurements of greenhouse gas emissions from full-scale MBT landfills have not been conducted so far. Thus, CH4 and nitrous oxide (N2O) emissions from a German MBT landfill in operation as well as their concentrations in the landfill gas (LFG) were measured. High N2O emissions of 20-200gCO2eq.m(-2)h(-1) magnitude (up to 428mgNm(-2)h(-1)) were observed within 20m of the working face. CH4 emissions were highest at the landfill zone located at a distance of 30-40m from the working face, where they reached about 10gCO2eq.m(-2)h(-1). The MBT material in this area has been deposited several weeks earlier. Maximum LFG concentration for N2O was 24.000ppmv in material below the emission hotspot. At a depth of 50cm from the landfill surface a strong negative correlation between N2O and CH4 concentrations was observed. From this and from the distribution pattern of extractable ammonium, nitrite, and nitrate it has been concluded that strong N2O production is associated with nitrification activity and the occurrence of nitrite and nitrate, which is initiated by oxygen input during waste deposition. Therefore, CH4 mitigation measures, which often employ aeration, could result in a net increase of GHG emissions due to increased N2O emissions, especially at MBT landfills.
机械生物处理（MBT）是一种有效的技术，它可以在垃圾填埋之前去除城市固体废物（MSW）中的有机碳。由此，强烈减少了垃圾填埋场中的甲烷（CH4）产生。然而，迄今为止，尚未对全规模 MBT 垃圾填埋场的温室气体排放进行直接测量。因此，对德国运营中的 MBT 垃圾填埋场的 CH4 和氧化亚氮（N2O）排放及其在垃圾填埋气（LFG）中的浓度进行了测量。在距工作面 20m 范围内观察到 20-200gCO2eq.m(-2)h(-1) （高达 428mgNm(-2)h(-1)）的高 N2O 排放。在距工作面 30-40m 的垃圾填埋区，CH4 排放最高，达到约 10gCO2eq.m(-2)h(-1)。该区域的 MBT 材料已经沉积了数周。在排放热点下方的材料中，N2O 的最大 LFG 浓度为 24.000ppmv。在距垃圾填埋场表面 50cm 的深度处，观察到 N2O 和 CH4 浓度之间存在强烈的负相关。从这一点以及可萃取的氨、亚硝酸盐和硝酸盐的分布模式可以得出结论，强烈的 N2O 产生与硝化作用以及亚硝酸盐和硝酸盐的发生有关，这是在废物沉积过程中氧气输入引起的。因此，由于 N2O 排放的增加，特别是在 MBT 垃圾填埋场，常采用曝气的 CH4 缓解措施可能会导致温室气体排放的净增加。
