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李诗月,冯丽娟,武华杰,等. 氧纳米气泡改性活性炭在河道底泥氨氮治理中的应用[J]. 科学技术与工程, 2021, 21(19): 8283-8289.
Li Shiyue,Feng Lijuan,Wu Huajie,et al.Application of Oxygen Nanobubble Modified Activated Carbon in Treatment of Ammonia Nitrogen in River Sediment[J].Science Technology and Engineering,2021,21(19):8283-8289.
氧纳米气泡改性活性炭在河道底泥氨氮治理中的应用
Application of Oxygen Nanobubble Modified Activated Carbon in Treatment of Ammonia Nitrogen in River Sediment
投稿时间:2020-12-02  修订日期:2021-04-19
DOI:
中文关键词:  纳米气泡  氨氮  原位修复  薄膜梯度扩散技术
英文关键词:nanobubbles  ammonia nitrogen  in-situ remediation  diffusive gradients in thin-films(DGT)
基金项目:国家自然科学基金(41276067)
                 
作者单位
李诗月 中国海洋大学 化学化工学院
冯丽娟 中国海洋大学 化学化工学院
武华杰 中国海洋大学 化学化工学院
姚硕 中国海洋大学 化学化工学院
张大海 中国海洋大学 化学化工学院
李先国 中国海洋大学 化学化工学院
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中文摘要:
      氧纳米气泡改性颗粒物被广泛应用于对污染水体的界面增氧。为研究其对底泥-水界面增氧效果和底泥氨氮污染的修复能力,以活性炭作为负载材料制备氧纳米气泡,采用柱芯培养实验研究氧纳米气泡改性活性炭对河道底泥氨氮去除效果。结果表明:氧纳米气泡改性活性炭的加入将沉积物-水界面(SWI)的溶解氧(DO)浓度由0.48 mg·L-1增加至6.10 mg·L-1,氧化还原电位(ORP)由-34 mV增加至19 mV。利用薄膜梯度扩散技术监测实验期间SWI处氨氮和硝态氮的垂直浓度,上覆水中氨氮的浓度由1.65 mg·L-1降至0.54 mg·L-1,去除率为67.3%。沉积物中氨氮浓度由2.75 mg·L-1降至0.73 mg·L-1,去除率为37.5%。氨氮的释放通量降低了82.0%。氧纳米气泡改性活性炭既通过界面增氧促进硝化反应,降低了水体中氨氮浓度,也作为覆盖层隔绝沉积物中氨氮与上覆水的接触,降低沉积物中氨氮的释放。研究结果可为覆盖技术和曝气技术联合应用于削减河道底泥氮负荷提供基础数据支持。
英文摘要:
      Oxygen nanobubble modified particles are widely used to increase oxygen at the sediment interface with polluted water bodies. In order to study its ability to aerate sediment interface and to remediate ammonia pollution, activated carbon was used as a supporting material to prepare oxygen nanobubble, and a column core culture experiment was used to study the effect of oxygen nanobubble modified activated carbon on the removal of ammonia nitrogen in river sediments. The results showed that the addition of oxygen nanobubble modified activated carbon to the SWI increased its dissolved oxygen (DO) concentration increased from 0.48 mg·L-1 to 6.10 mg·L-1, and its oxidation-reduction potential (ORP) increased from 34 mV to 19 mV. During the experiment, the diffusion gradients in thin-films technology was used to monitor the vertical concentration of ammonia nitrogen and nitrate at SWI. The addition of oxygen nanobubble modified activated carbon reduced the concentration of ammonia nitrogen in the overlying water from 1.65 mg·L-1 to 0.54 mg·L-1, removing 67.3%. The concentration of ammonia nitrogen in the sediment was reduced from 2.75 mg·L-1 to 0.73 mg·L-1, and the removal rate was 37.5%. The flux of ammonia nitrogen was reduced by 82.0%. Oxygen nanobubble modified activated carbon to promote the nitration reaction by the interfacial both oxygen, reducing the concentration of ammonia water, but also as a contact layer insulating cover overlying sediments with ammonia water, sediments reduce the release of ammonia. In this paper, the combined application of overlay technology and interface oxygen nanobubble aeration technology, the research results can provide basic data support for reducing the ammonia nitrogen load in the river.
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