厌氧-准好氧联合型生物反应器填埋场产气规律的研究

通过将厌氧型生物反应器填埋场（ANBL）和准好氧矿化垃圾生物反应床（SAARB）串联,组成新型的厌氧-准好氧联合型生物反应器填埋场（AN-SABL）,研究其产气速率、产气量以及产气组分的变化规律,以期为填埋气体的收集、利用和处理提供理论依据.实验表明,AN-SABL中的厌氧填埋单元的产气受到了抑制,其中ANBL2号单元和ANBL3号单元的产气率分别为49 L.kg-1和39 L.kg-1,仅占ANBL1号的94.2%和75.0%,但提高回灌频率,能促进厌氧填埋单元的产气,其甲烷含量最大值可达到62.67%;ANBL夏季产气速率和产气量明显高于冬季,并以12 h为周期交替出现产气高峰;此外,AN-SABL能够促进其厌氧单元的硝化和反硝化作用,N2O的含量受季节和填埋场类型影响显著,其变化范围在0.001 7%～4.017 9%之间.ANBL的累积产气量在初始调整阶段呈对数增长,过渡酸化阶段呈线性增长,酸化产甲烷阶段呈指数增长.

Aerogenesis Evolution of the Anaerobic-semiaerobic Bioreactor Landfill

A novel bioreactor landfill, the anaerobic-semiaerobic bioreactor landfill (AN-SABL), was devised by combining an anaerobic bioreactor landfill (ANBL) with a semi-aerobic aged refuse biofilter (SAARB). Meanwhile, relevant parameters such as gas production volume and rate, and gas constituents were investigated to provide a theoretical foundation for the collection, utilization and treatment of landfill gas. Results indicated that the gas production of the anaerobic units was inhibited in the AN-SABLs. The gas production rates in the ANBL2 unit and the ANBL3 unit were 49 L·kg^-1 and 39 L·kg^-1 respectively, which were only 94.2% and 75.0% of that in the ANBL1. However, the gas production in the anaerobic unit could be accelerated by increasing the recirculation frequency. The maximum methane content could reach up to 62.67%. Moreover, the gas production volume and velocity in the ANBL were much higher in summer than those in winter, and the gas production peak could be observed with a 12-hour cycle. Besides, the nitrification and the denitrification in the anaerobic units would be enhanced remarkably in the AN-SABLs. It resulted that the content of N₂O, which fluctuated between 0.0017% and 4.0179%, was influenced obviously by the seasonal variation and the landfill types. Based on the mathematical model of aerogenesis, the cumulative gas volume of the ANBL increased logarithmically in the initial aerobic phase, then increased linearly in the anaerobic acid phase, and increased exponentially in the methane production of acid phase afterwards.