| 硝酸盐连续回灌对生物反应器填埋场N2O产生的影响 |
| 摘要点击 2539 全文点击 1052 投稿时间：2014-03-13 修订日期：2014-06-29 |
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| 中文关键词 硝酸盐 生物反应器填埋场 氧化亚氮 原位反硝化 C/N |
| 英文关键词 nitrate bioreactor landfill nitrous oxide in-situ denitrification C/N |
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| 中文摘要 |
| 异位硝化-原位反硝化是实现填埋场渗滤液脱氮处理的一种有效措施，但硝化反硝化过程中会产生强温室气体N2O. 实验构建了3个新鲜垃圾生物反应器填埋场模拟装置，分别回灌NO3--N浓度为50、100和300 mg·L-1的渗滤液，考察垃圾原位反硝化过程中N2O产生规律及其影响因素. 结果表明，回灌不同浓度硝酸盐，N2O产生量均表现为初期浓度较大-下降-后期升高的规律；N2O产生量与回灌NO3--N量正相关，其累积产生量分别为36481、44241、86264 μg，但反硝化消耗单位硝酸盐氮产生的N2O量（以N计）以及N2O转化率与回灌硝酸盐氮量呈负相关，N2O平均转化率分别为8.84‰、5.68‰和2.34‰. 分析认为，各反应器垃圾降解后期反硝化碳源不足是N2O产生量高的主要原因. |
| 英文摘要 |
| A combined process comprised of ex-situ nitrification and in-situ denitrification in different bioreactors is an effective measure to nitrogen removal, but it will cause N2O, a strong greenhouse gas, emissions. This paper focused on the production characteristics and influencing factors of N2O by establishing 3 bioreactor landfill units by continuous injected different amount of nitrate leachate(50,100 and 300mg·L-1),with fresh MSW as material in an experimental scale. Experimental results showed that the production of N2O had the same regulation with different amount of NO3--N injection,they all showed high at the initial period,then at a lower level,finnal at a higher level; The cumulative production is positively correlated with the amount of NO3--N, the total quantity of N2O are 36481, 44241 and 86264 μg respectively; However,the amount of N2O by consumption per nitrate nitrogen and N2O conversion ratio by denitrification is negatively correlation with the amount of NO3--N, the average conversion ratio are 8.84‰, 5.68‰, 2.34‰ respectively; Shortage of carbon source for denitrification is the main reason for the high N2O production in each reactor in the later period. |
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