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Supervisor：Jiangxi University Of Science And Technology
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Jiangxi Nonferrous Metals Society
ISSN：1674-9669
CN：36-1311/TF
CODEN YJKYA9
Volume 14 Issue 3
Jun.  2023
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LUO Xiaojuan, LUO Kai, ZHONG Zhaohuang, LI Xindong. Treatment of ionic rare earth smelting wastewater by a membrane bioreactor based on aerobic granular sludge[J]. Nonferrous Metals Science and Engineering, 2023, 14(3): 439-446. DOI: 10.13264/j.cnki.ysjskx.2023.03.017
Citation: LUO Xiaojuan, LUO Kai, ZHONG Zhaohuang, LI Xindong. Treatment of ionic rare earth smelting wastewater by a membrane bioreactor based on aerobic granular sludge[J]. Nonferrous Metals Science and Engineering, 2023, 14(3): 439-446. DOI: 10.13264/j.cnki.ysjskx.2023.03.017
shu

Treatment of ionic rare earth smelting wastewater by a membrane bioreactor based on aerobic granular sludge

  • 1.

    Department of Construction Engineering, Gannan University of Science and Technology, Ganzhou 341000, Jiangxi, China

  • 2.

    School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China

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  • Received Date: August 21, 2022
  • Revised Date: October 16, 2022
  • Available Online: June 30, 2023
    Graphical Abstract
    • Abstract
  • Organic wastewater from rare earth smelting is a high-concentration acid with great harmfulness and complex water quality. The main pollutants include organic matter, ammonia nitrogen, suspended matter, inorganic salts, and heavy metals, so it is of great significance to study how to effectively treat organic wastewater from rare earth smelting to protect water and soil. A sequential batch membrane bioreactor (SBR-MBR) was constructed, combining with aerobic granular sludge (AGS) to form an aerobic granular sludge membrane bioreactor (AGS-MBR). On this basis, the effect of different C/N ratios (the ratio of total contents of carbon to nitrogen in organic matter C/N) on the AGS-MBR treatment process was studied. The results show that when C/N is 10, the aerobic granular sludge has the best stability, with the removal rates of COD, NH4+-N, TN and TP at 99.0%, 96.7%, 79.3% and 91.1%, respectively. The decrease in influent C/N has little influence on the removal of COD by AGS-MBR but has a great effect on the form of effluent N and TP. When C/N≤7, part of the aerobic granular sludge disintegrates, and the effluent TN and TP concentrations meet the requirements of Grade A discharge standard GB 18918—2002(2006) in the Pollutant Discharge Standard for Urban Sewage Treatment Plants, which provides a theoretical basis for further research on the treatment of organic wastewater from rare earth smelting with lower C/N ratios.
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