...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental research >Influence of CeO_2 nanoparticles on viscoelastic properties of sludge: Role of extracellular polymeric substances
【24h】

Influence of CeO_2 nanoparticles on viscoelastic properties of sludge: Role of extracellular polymeric substances

机译：CeO_2纳米颗粒对污泥粘弹性的影响：细胞外聚合物的作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Cerium oxide nanoparticles (CeO2 NPs) affected the production of extracellular polymeric substances (EPSs), and thus might bring challenges for sludge pumping and mixing. In the present study, we investigated the Theological behavior of sludge before and after extraction of different EPSs fractions under various CeO2 NPs concentrations. It was found that the removal of loosely bound EPSs (LB-EPSs) could affect the shear stress (tau) and apparent viscosity (eta), and the changes were dependent on CeO2 NPs concentrations. The removal of tightly bound EPSs (TB-EPSs) either with or without the addition of CeO2 NPs significantly decreased the yield stress (tau(y)) and the limiting viscosity (eta(infinity)). Furthermore, the dynamic (strain, frequency and time) sweep measurements proved that the storage modulus (G') decreased after the extraction of TB-EPSs, indicating the weakened elastic and solid-like properties. The fluctuated content of polysaccharide in LB-EPSs and the increased amount of protein in TB-EPSs were likely to contribute to the variation of viscoelastic behaviors after the removal of LB-EPSs and TB-EPSs, respectively. In addition, the decreased Theological properties of sludge was also related to the increased zeta potential, decreased particle size and the removal of key organic matters of (10(4)-10(6) Da) with the extraction of stratified EPSs. These results were significant to take advantages of the Theological properties for sludge treatment in the presence of NPs.
机译：氧化铈纳米颗粒（CeO2 NPs）影响细胞外聚合物（EPS）的产生，因此可能给污泥泵送和混合带来挑战。在本研究中，我们研究了在各种CeO2 NPs浓度下提取不同EPSs馏分前后污泥的神学行为。发现松散结合的EPS（LB-EPSs）的去除会影响剪切应力（tau）和表观粘度（eta），并且其变化取决于CeO2 NPs的浓度。不论是否添加CeO2 NP，去除紧密结合的EPS（TB-EPS）均可显着降低屈服应力（tau（y））和极限粘度（eta（infinity））。此外，动态（应变，频率和时间）扫描测量证明，提取TB-EPS后储能模量（G'）降低，表明其弹性和类固形物性能减弱。 LB-EPSs中多糖含量的波动和TB-EPSs中蛋白质含量的增加可能分别导致LB-EPSs和TB-EPSs去除后粘弹性行为的变化。此外，污泥的流变学特性下降还与分层EPS的提取增加了Zeta电位，减小了粒径以及去除了（10（4）-10（6）Da）的关键有机物有关。这些结果对于利用NPs存在下的污泥处理的流变特性具有重要意义。

著录项

  • 来源
    《Environmental research》 |2018年第11期|34-41|共8页
  • 作者

    You Guoxiang; Wang Peifang; Hou Jun; Wang Chao; Miao Lingzhan; Xu Yi; Feng Tao;

  • 作者单位

    Hohai Univ, Coll Environm, Minist Educ, Key Lab Integrated Regulat & Resources Dev Shallo, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Environm, Minist Educ, Key Lab Integrated Regulat & Resources Dev Shallo, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Environm, Minist Educ, Key Lab Integrated Regulat & Resources Dev Shallo, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Environm, Minist Educ, Key Lab Integrated Regulat & Resources Dev Shallo, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Environm, Minist Educ, Key Lab Integrated Regulat & Resources Dev Shallo, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Environm, Minist Educ, Key Lab Integrated Regulat & Resources Dev Shallo, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Environm, Minist Educ, Key Lab Integrated Regulat & Resources Dev Shallo, Nanjing 210098, Jiangsu, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CeO2 nanoparticles; Stratified extracellular polymeric substances; Herschel-Bulkley model; Dynamic sweep tests; Key organic matters;

    机译：CeO2纳米颗粒;分层的细胞外聚合物;Herschel-Bulkley模型;动态扫描试验;关键有机物;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号