| 信号分子强化改性挂膜沸石持续抑制沉积物中氨氮释放 |
| 摘要点击 2606 全文点击 1104 投稿时间：2021-05-07 修订日期：2021-07-06 |
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| 中文关键词 底泥修复 信号分子 改性挂膜沸石 原位再生 沸石使用寿命 |
| 英文关键词 reparation of contaminated sediments signaling molecules modified zeolite and biofilm system in-suit regeneration service life |
| 作者 | 单位 | E-mail | | 徐金兰 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | xujinlan@xauat.edu.cn | | 许洋 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | | | 李修民 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | | | 国淼 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | | | 刘成海 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | |
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| 中文摘要 |
| 为寻找一种长期有效的底泥修复方式，对沸石进行了改性并挂膜的实验.考察了4种铝盐[AlCl3、Al（NO3）3、Al2（SO4）3和KAl（SO4）2]改性挂膜沸石对上覆水中氨氮的去除情况.结果表明，AlCl3改性挂膜沸石效果最佳，且最佳改性浓度为0.8 mol·L-1.进一步分析添加信号分子OHHL后，AlCl3改性挂膜、NaCl改性挂膜和天然挂膜沸石抑制河流底泥中氮释放的持续性.其中AlCl3改性挂膜沸石上附着的细菌量多，反硝化菌数量占比高（初始82.1%；30 d后61.1%），因此，生物再生率高（64.9%），从而使得该沸石使用寿命长达8.5个月.可见，AlCl3改性挂膜沸石能对底泥释放的氮负荷达到有效持续地抑制. |
| 英文摘要 |
| This experiment used a modified zeolite and biofilm system to find a long-term effective way of repairing sediment. Four types of modified zeolites[AlCl3, Al(NO3)3, Al2(SO4)3, and KAl(SO4)2] and a biofilm system were investigated for the removal of ammonia nitrogen from overlaying water. The results showed that, of the modified zeolites, AlCl3 had the greatest effect on the zeolite and biofilm system, and the optimal modified concentration was 0.8 mol·L-1. The persistence was further studied after adding OHHL, including the inhibition of ammonium released from contaminated sediment by the AlCl3-modified zeolite and biofilm system, NaCl-modified zeolite and biofilm system, and natural zeolite and biofilm system. The results illuminated that the number of bacteria attached to the AlCl3-modified zeolite and biofilm system was the highest, and the proportion of denitrifying bacteria was also high (the initial proportion was 82.1%; 30 days later it was 61.1%). Therefore, the biological regeneration was high (64.9%), which caused the zeolite service life to be up to 8.5 months. Thus, ammonium released from contaminated sediment can be inhibited effectively and continuously by an AlCl3-modified zeolite and biofilm system. |
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