陈红1,
薛罡1
1.东华大学环境科学与工程学院,上海 201620
基金项目: 国家自然科学基金资助项目(51508081)
中央高校基本科研业务费专项资金资助项目(2232015D3-23)
Effect of copper nanoparticles and triclosan on sludge nitrification
CHENG Yuying1,,CHEN Hong1,
XUE Gang1
1.College of Environmental Science and Engineering, Donghua University, Shanghai 201620,China
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摘要:金属纳米颗粒 (NPs) 与药品及个人护理品 (PPCPs) 的广泛使用,使其不可避免地释放至污水中,进入污水处理系统对污水生物处理产生潜在危害。由于硝化菌极易受到有毒有害物质的影响,选取纳米铜(CuNPs) 和三氯生 (TCS) 作为目标污染物,研究其对污泥硝化过程中COD去除、硝化效果、污泥理化性质等方面的影响。结果表明,目标污染物的暴露初期对硝化效果产生不同程度的抑制,TCS、CuNPs及二者复合暴露时硝化效率分别下降8.7%、34%和31.7%,但随着暴露时间的增加,硝化效率逐渐恢复至正常水平。然而尽管硝化反应结束后对NH+4-N的去除率无明显差异,但CuNPs及二者同时暴露时对硝化速率及污泥的同化作用有显著抑制,而单独的TCS无明显影响。进一步研究发现CuNPs及二者复合暴露时对污泥的表面结构有一定的破损影响,且污泥的沉淀性能变差。
关键词: 纳米铜/
三氯生/
污泥/
硝化作用/
复合影响
Abstract:With the widespread use of metal nanoparticles (NPs) and pharmaceuticals and personal care products (PPCPs), their release into wastewater is inevitable, and they may show impacts on the wastewater biological treatment. Since nitrifying bacteria are easily affected by toxic and harmful substances, copper nanoparticles and triclosan were selected as target pollutants, and their effect on COD removal, nitrification efficiency and physicochemical properties of sludge during nitrification process were studied. The results suggested that the initial exposure of the target pollutants inhibited the nitrification effect to different degrees. The nitrification efficiency decreased by 8.7%, 34% and 31.7%,respectively under the exposure of triclosan, copper nanoparticles and their co-existence. However, the nitrification efficiency gradually recovered to normal level with the increase of exposure time. Although the removal efficiency of NH+4-N was not significantly different at the end of nitrification process, the rate of nitrification and the assimilation of sludge were significantly inhibited when only CuNPs were exposed, and these two pollutants were exposed simultaneously, whereas TCS alone had no significant effect. Further studies found that it had a certain damage to the surface structure of sludge and the precipitation of sludge became poor when CuNPs and these two pollutants were exposed.
Key words:copper nanoparticles/
triclosan/
sludge/
nitrification/
compound influence.
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纳米铜及三氯生对污泥硝化作用的影响
成钰莹1,,陈红1,
薛罡1
1.东华大学环境科学与工程学院,上海 201620
基金项目: 国家自然科学基金资助项目(51508081) 中央高校基本科研业务费专项资金资助项目(2232015D3-23)
关键词: 纳米铜/
三氯生/
污泥/
硝化作用/
复合影响
摘要:金属纳米颗粒 (NPs) 与药品及个人护理品 (PPCPs) 的广泛使用,使其不可避免地释放至污水中,进入污水处理系统对污水生物处理产生潜在危害。由于硝化菌极易受到有毒有害物质的影响,选取纳米铜(CuNPs) 和三氯生 (TCS) 作为目标污染物,研究其对污泥硝化过程中COD去除、硝化效果、污泥理化性质等方面的影响。结果表明,目标污染物的暴露初期对硝化效果产生不同程度的抑制,TCS、CuNPs及二者复合暴露时硝化效率分别下降8.7%、34%和31.7%,但随着暴露时间的增加,硝化效率逐渐恢复至正常水平。然而尽管硝化反应结束后对NH+4-N的去除率无明显差异,但CuNPs及二者同时暴露时对硝化速率及污泥的同化作用有显著抑制,而单独的TCS无明显影响。进一步研究发现CuNPs及二者复合暴露时对污泥的表面结构有一定的破损影响,且污泥的沉淀性能变差。
English Abstract
Effect of copper nanoparticles and triclosan on sludge nitrification
CHENG Yuying1,,CHEN Hong1,
XUE Gang1
1.College of Environmental Science and Engineering, Donghua University, Shanghai 201620,China
Keywords: copper nanoparticles/
triclosan/
sludge/
nitrification/
compound influence
Abstract:With the widespread use of metal nanoparticles (NPs) and pharmaceuticals and personal care products (PPCPs), their release into wastewater is inevitable, and they may show impacts on the wastewater biological treatment. Since nitrifying bacteria are easily affected by toxic and harmful substances, copper nanoparticles and triclosan were selected as target pollutants, and their effect on COD removal, nitrification efficiency and physicochemical properties of sludge during nitrification process were studied. The results suggested that the initial exposure of the target pollutants inhibited the nitrification effect to different degrees. The nitrification efficiency decreased by 8.7%, 34% and 31.7%,respectively under the exposure of triclosan, copper nanoparticles and their co-existence. However, the nitrification efficiency gradually recovered to normal level with the increase of exposure time. Although the removal efficiency of NH+4-N was not significantly different at the end of nitrification process, the rate of nitrification and the assimilation of sludge were significantly inhibited when only CuNPs were exposed, and these two pollutants were exposed simultaneously, whereas TCS alone had no significant effect. Further studies found that it had a certain damage to the surface structure of sludge and the precipitation of sludge became poor when CuNPs and these two pollutants were exposed.
