陈炜鸣,辜哲培,何晨,李启彬.老龄垃圾渗滤液中溶解性有机物在SAARB和MBR处理过程的转化特征[J].环境科学学报,2021,41(11):4637-4647
老龄垃圾渗滤液中溶解性有机物在SAARB和MBR处理过程的转化特征
- Molecular insights into the removal characteristics of dissolved organic matters from mature landfill leachate by SAARB and MBR processes
- 基金项目：西南交通大学优秀博士学位论文培育项目（No.D-YB201907）
- 陈炜鸣
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 辜哲培
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 何晨
- 中国石油大学(北京) 重质油国家重点实验室, 北京 102249
- 李启彬
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 摘要：生物法是常用的垃圾渗滤液处理工艺，然而垃圾渗滤液中有机物组成极为复杂，在生物处理过程有机物被完全去除、新产生、减少、保留和增加的5种情形不明.本文采用了超高分辨质谱电喷雾电离傅立叶变换离子回旋共振质谱从分子层面研究老龄垃圾渗滤液中溶解性有机物（DOM）分别在矿化垃圾床（SAARB）和膜生物反应器（MBR）处理过程的转化特征.结果表明，老龄垃圾渗滤液含有5000多个DOM分子式，主要由CHO、CHON、CHOS和CHONS类物质组成，分子组成十分复杂.经过SAARB和MBR处理后，出水中DOM数量分别小幅降低至4909和4864种，SAARB和MBR作为生物法对老龄垃圾渗滤液中有机物分子去除特性相似，被完全去除和减少的物质组成主要为生物可利用性较高的脂肪族类物质（H/C ≥ 1.5）、高度不饱和物质和酚类物质（0.50 ≥ AI，H/C<1.5），这部分DOM表现出还原饱和的化学特性.新产生、保留和增加的部分物质主要是传统意义上指代的难降解有机物，其主要是高度不饱和物质和酚类物质（0.50 ≥ AI，H/C<1.5）以及芳香指数更高的多酚类物质（0.66 ≥ AI>0.50），表现为氧化不饱和和还原不饱和的化学特性.本文揭示了老龄垃圾渗滤液在生物处理过程中DOM分子层面的转化特征，为老龄垃圾渗滤液在生物法高效处理提供理论参考.
- Abstract：Biological process is the commonly applied pre-treatment method for landfill leachate, whereas the removed, eliminated, resistant, increased, and produced parts of dissolved organic matters (DOMs) during the biological process still remain unclear owing to the complexity of leachate constitution. In this study, electron spray ionization coupled Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ESI FT-ICR MS) was applied to investigate the DOM transformation characteristics, at the molecular level, of mature landfill leachate by semi-aerobic aged refuse biofilter (SAARB) and membrane bioreactor (MBR) respectively. Results indicated that more than 5000 DOMs existed in mature landfill leachate, mainly compromising CHO, CHON, CHOS, and CHONS compounds, which confirmed the complex DOM constitution of mature landfill leachate. After treatment of SAARB and MBR, number of DOMs decreased to 4909 and 4864, respectively. In addition, the treatment characteristics of SAARB and MBR, in terms of DOM transformation, are found to be similar. Removed and eliminated DOMs mainly are at high bioavailability, such as aliphatic compounds (H/C ≥ 1.5) and highly unsaturated and phenolic compounds (0.50 ≥ AI, H/C<1.5) which are characterized by reduced and saturated properties. Newly produced, resistant, and increased DOMs are mainly conservatively considered as refractory organics, mostly including highly unsaturated and phenolic compounds (0.50 ≥ AI, H/C<1.5) and polyphenols (0.66 ≥ AI>0.50) with high aromaticity. These termed refractory organics have the chemical properties with oxidized unsaturated and/or reduced unsaturated state. This study reveals the DOM transformation characteristics of mature landfill leachate in biological treatment process at the molecular level, thus providing beneficial and theoretical reference for efficient treatment of mature landfill leachate by biological process.
