Improving leachate quality and optimizing CH4 and N2O emissions from a pre-aerated semi-aerobic bioreactor landfill using different pre-aeration strategies
Improving leachate quality and optimizing CH4 and N2O emissions from a pre-aerated semi-aerobic bioreactor landfill using different pre-aeration strategies
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使用不同的预曝气策略提高预曝气半好氧生物反应器垃圾填埋场的渗滤液质量并优化 CH4 和 N2O 排放
DOI：
10.1016/j.chemosphere.2018.06.148
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发表时间：
2018-10-01
期刊：
影响因子：
8.8
通讯作者：
Wang, Ya-nan
中科院分区：
文献类型：
--
作者：
Li, Weihua;Sun, Yingjie;Wang, Ya-nan
垃圾填埋充气有效加速了市政固体废物（MSW）稳定。该方法还会影响曝气过程中甲烷（CH4）和一氧化二氮（N2O）的排放。在这项研究中，研究了低频和高频间歇性充气（LIA和HIA）和持续的Micro-Aeraling（CMA）。实验结果表明，这三种策略有效地降低了渗滤液中有机和氮的污染物浓度。与间歇性充气（IA）相比，CMA增加了累积CH4排放（92343 mg），并导致更长的排放周期（95天）。 HIA由于充气期间有机物损失而产生的累积CH4排放最少（4297.6 mg）和最短的排放周期（65天）。对于每个生物反应器的早期阶段，N2O排放率在低水平上存在，然后由于较低的碳氮比，在后期阶段增加了1-3个数量级。与CMA相比，HIA导致最大累积N2O排放（2884.6 mg），并且经历了更长的排放周期（179天）（2281.6 mg； 151天）。 LIA的N2O排放周期最长（209天），但累积N2O排放量最低（1486.3 mg）。 CH4和N2O排放主要发生在垃圾填埋稳定的早期和后期。因此，该研究提出了实用垃圾填充曝气管理的优化的预先安装策略：早期CMA可能会促进快速的有机物去除和有效的CH4恢复；晚期LIA可能会减少N2O排放。 （c）2018 Elsevier Ltd.保留所有权利。
Landfill aeration efficiently accelerates municipal solid waste (MSW) stabilization. This method also impacts methane (CH4) and nitrous oxide (N2O) emissions during aeration. In this study, the effects of three pre-aeration strategies on leachate quality variations and CH4 and N2O emissions from three labscale pre-aerated semi-aerobic bioreactor landfills, which were filled with MSW, were investigated: low frequency and high frequency intermittent aeration (LIA and HIA) and continuous micro-aeration (CMA). Experimental results showed that these three strategies effectively reduced organic and N-based pollutants concentration in leachate. Compared with intermittent aeration (IA), CMA increased cumulative CH4 emissions (92343 mg) and resulted in a longer emission period (95 days). HIA generated the least cumulative CH4 emissions (4297.6 mg) and shortest emission period (65 days) due to organic matter loss during aeration. N2O emissions were present at low levels in early stages for each bioreactor, and then, increased by 1-3 orders of magnitude in the later stages due to low influent carbon-nitrogen ratio. HIA resulted in maximum cumulative N2O emissions (2884.6 mg) and experienced a longer emission period (179 days) compared to CMA (2281.6 mg; 151 days). LIA had the longest N2O emission period (209 days), but had the lowest cumulative N2O emissions (1486.3 mg). CH4 and N2O emissions mainly occurred in the early and later stages of landfill stabilization, respectively. Therefore, the study proposes an optimized pre-aeration strategy for practical landfill aeration management: early CMA may promote rapid organic matter removal and effective CH4 recovery; and late LIA may reduce N2O emissions. (C) 2018 Elsevier Ltd. All rights reserved.