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Organics and nitrogen removal and sludge stability in aerobic granular sludge membrane bioreactor

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Abstract

Novel aerobic granular sludge membrane bioreactor (GMBR) was established by combining aerobic granular sludge technology with membrane bioreactor (MBR). GMBR showed good organics removal and simultaneous nitrification and denitrification (SND) performances for synthesized wastewater. When influent total organic carbon (TOC) was 56.8–132.6 mg/L, the TOC removal of GMBR was 84.7–91.9%. When influent ammonia nitrogen was 28.1–38.4 mg/L, the ammonia nitrogen removal was 85.4–99.7%, and the total nitrogen removal was 41.7–78.4%. Moreover, batch experiments of sludge with different particle size demonstrated that: (1) flocculent sludge under aerobic condition almost have no denitrification capacity, (2) SND capacity was caused by the granular sludge, and (3) the denitrification rate and total nitrogen removal efficiency were enhanced with the increased particle size. In addition, study on the sludge morphology stability in GMBR showed that, although some granular sludge larger than 0.9 mm disaggregated at the beginning of operation, the granular sludge was able to maintain the stability of its granular morphology, and at the end of operation, the amount of granular sludge (larger than 0.18 mm) stabilized in GMBR was more than 56–62% of the total sludge concentration. The partial disaggregation of large granules is closely associated with the change of operating mode from sequencing batch reactor (SBR) system to MBR system.

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Acknowledgment

Financial supports from the National High Technology Research and Development Program of China (Grant No. 2006AA06Z334), the National Natural Science Foundation of China (Grant No. 30600487), and the Science and Technology Development Foundation of Tianjin Higher Institute (Grant No. 20070714) were acknowledged.

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Correspondence to Jingfeng Wang.

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Wang, J., Wang, X., Zhao, Z. et al. Organics and nitrogen removal and sludge stability in aerobic granular sludge membrane bioreactor. Appl Microbiol Biotechnol 79, 679–685 (2008). https://doi.org/10.1007/s00253-008-1466-6

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Keywords

  • Aerobic granular sludge
  • Membrane bioreactor
  • Simultaneous nitrification and denitrification (SND)
  • Sludge stability