IDEAS home Printed from https://ideas.repec.org/a/gam/jijerp/v16y2019i19p3609-d270986.html
   My bibliography  Save this article

Effect of Increased Influent COD on Relieving the Toxicity of CeO 2 NPs on Aerobic Granular Sludge

Author

Listed:
  • Xiaoying Zheng

    (Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)

  • Yuan Zhang

    (Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)

  • Wei Chen

    (Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)

  • Weihong Wang

    (College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Nongda East Road No. 311, Sayibak District, Urumqi 830052, China)

  • Hang Xu

    (Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)

  • Xiaoyao Shao

    (Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)

  • Mengmeng Yang

    (Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)

  • Zhi Xu

    (Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)

  • Linghua Zhu

    (Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China)

Abstract

Due to the increased use of cerium oxide nanoparticles (CeO 2 NPs), their potential environmental risks have caused concern. However, their effects on the aerobic granular sludge (AGS) process and the later recovery of AGS are still unclear. In this study, we comprehensively determined the changes in pollutant removal and the levels of extracellular polymeric substances (EPS) in AGS that were exposed to CeO 2 NP treatments (0 (the control, R0), 1 (R1), and 5 (R5) mg/L), following an increase in the influent chemical oxygen demand (COD). An increase in the CeO 2 NP concentration enhanced their inhibitory effect on the removal of total nitrogen (TN) and total phosphorus (TP), and promoted the production of polysaccharides (PS) and proteins (PN) in loosely bound EPS (LB-EPS) or tightly bound EPS (TB-EPS), as well as the dissolved organic carbon (DOC) components in EPS, but had no long-term effects on the removal of organic matter. When the addition of CeO 2 NPs was stopped and the concentration of influent COD increased, the TN and TP removal efficiencies in R1 and R5 slowly increased and recovered. In R1, they were only 4.55 ± 0.55% and 2.71 ± 0.58% lower than in R0, respectively, while the corresponding values for R5 were 5.06 ± 0.46% and 6.20 ± 0.63%. Despite the LB-EPS and TB-EPS concentrations in the R1 and R5 treatments recovering and being similar to the levels in the control when no CeO 2 NPs were added, they were still slightly higher than in the R0, which indicating that the negative effects of CeO 2 NPs could not be completely eliminated due to the residual CeO 2 NP levels in AGS.

Suggested Citation

  • Xiaoying Zheng & Yuan Zhang & Wei Chen & Weihong Wang & Hang Xu & Xiaoyao Shao & Mengmeng Yang & Zhi Xu & Linghua Zhu, 2019. "Effect of Increased Influent COD on Relieving the Toxicity of CeO 2 NPs on Aerobic Granular Sludge," IJERPH, MDPI, vol. 16(19), pages 1-11, September.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:19:p:3609-:d:270986
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1660-4601/16/19/3609/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1660-4601/16/19/3609/
    Download Restriction: no
    ---><---

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jijerp:v:16:y:2019:i:19:p:3609-:d:270986. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.