| 硝酸盐和甲烷对覆土中苯系物厌氧氧化的影响 |
| 摘要点击 1388 全文点击 888 投稿时间：2015-01-31 修订日期：2015-03-16 |
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| 中文关键词 CH4 苯系物 硝酸盐 耦合 填埋覆土 |
| 英文关键词 CH4 BTEX Nitrate coupling landfill cover soils |
| 作者 | 单位 | E-mail | | 柳蓉 | 暨南大学环境学院, 广州 510632
暨南大学广东省高校水土环境毒害性污染物防治与生物修复重点实验室, 广州 510632 | liurongcm@163.com | | 龙焰 | 暨南大学环境学院, 广州 510632
暨南大学广东省高校水土环境毒害性污染物防治与生物修复重点实验室, 广州 510632 | tlongyan@jnu.edu.cn | | 王立立 | 暨南大学环境学院, 广州 510632
暨南大学广东省高校水土环境毒害性污染物防治与生物修复重点实验室, 广州 510632 | | | 何婷 | 暨南大学环境学院, 广州 510632
暨南大学广东省高校水土环境毒害性污染物防治与生物修复重点实验室, 广州 510632 | | | 叶锦韶 | 暨南大学环境学院, 广州 510632
暨南大学广东省高校水土环境毒害性污染物防治与生物修复重点实验室, 广州 510632 | |
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| 中文摘要 |
| 苯系物是填埋场填埋气中恶臭有机气体的重要成分之一,填埋气中的CH4则是重要的温室气体. 填埋覆土层中的微生物可以氧化CH4和苯系物,因此,强化微生物的氧化效能有助于削减和控制填埋气的污染. 电子受体还原可耦合甲烷和某些有机物的厌氧氧化,从而去除甲烷和有机物. 鉴此,本研究通过静态培养试验,分析了电子受体SO42-共存条件下,NO3-和CH4共存对覆土中苯系物厌氧降解的影响. 结果表明不外加NO3-时,苯系物抑制CH4的降解,加入NO3-后,苯系物共存反而有利于CH4的去除;单独添加NO3-或CH4都能促进填埋覆土中苯系物的去除;而同时添加NO3-和CH4能更好地促进苯系物的去除,甲苯、二甲苯和异丙苯的去除率最高可达65%、88%和82%,远高于不添加NO3-和CH4对照处理的53%、76%和31%;NO3-还原与CH4厌氧氧化耦合过程能同步促进苯系物的厌氧氧化. |
| 英文摘要 |
| BETX is one of the important components of stink organic gases in landfills, which simultaneously release much of greenhouse CH4. The microorganisms in landfill cover soils are able to degrade CH4 and BETX. Therefore, improving the capacity of biological oxidation of microorganisms in landfill cover soils can effectively reduce and control pollution caused by landfill gases. Some electron acceptors can couple to anaerobic oxidation of methane and some organic pollutants, thus eliminating methane and organic substances. Based on the above theory, this research investigated the effect of nitrate (NO3-) and CH4 on anaerobic degradation of benzene series (toluene, xylene and isopropyl benzene) with coexistence of SO42- in landfill cover soils through static incubation experiment. The results showed that BTEX inhibited the degradation of CH4 without adding nitrate, however, BTEX instead improved the removal of CH4 after nitrate addition. Although single addition of nitrate or CH4 could improve the removal of BTEX in landfill cover soils, adding both of them could improve the removal of BTEX better as the removal efficiencies for benzene, toluene and isopropyl benzene were respectively reached 65%, 88% and 82%, much higher than those of 53%, 76% and 31% when not adding nitrate and CH4. The process of anaerobic methane oxidation coupled to nitrate reduction was able to synchronously improve anaerobic oxidation of BETX. |
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