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Nitrite accumulation followed by denitrification using sequencing batch reactor.

C S Gee1, J S Kim

  • 1Water Resources and Environmental Research Department, Korea Institute of Construction Technology, 311 Daehwadong, Koyang, Kyonggi, 411-712, Korea. csgee@kict.re.kr

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|May 13, 2004
PubMed
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This study aimed to directly remove nitrite to nitrogen gas via denitrification, bypassing nitrate formation. By controlling operational factors in a sequencing batch reactor (SBR), researchers successfully accumulated nitrite for enhanced biological nitrogen removal.

Area of Science:

  • Environmental Microbiology
  • Wastewater Treatment Engineering

Background:

  • Biological nitrogen removal typically involves nitrification (ammonia to nitrate) followed by denitrification (nitrate to nitrogen gas).
  • This study investigates an alternative pathway to directly convert nitrite to nitrogen gas, potentially improving efficiency.

Purpose of the Study:

  • To eliminate the nitrite oxidation to nitrate step in biological nitrogen removal.
  • To achieve direct nitrite denitrification to nitrogen gas.
  • To evaluate operational factors influencing nitrite accumulation and kinetics in a sequencing batch reactor (SBR).

Main Methods:

  • Utilized supernatant from an anaerobic digester as an ammonia source.
  • Employed a sequencing batch reactor (SBR) with controlled aeration and non-aeration periods.

Related Experiment Videos

  • Manipulated solid retention time (SRT) and ammonia loading to suppress nitrite-oxidizing bacteria (Nitrobacter).

    • Main Results:

    • Nitrite accumulation was achieved by suppressing Nitrobacter growth through high ammonia loading strategies.
    • Nitrite oxidation occurred at SRTs of 2.5 to 3.0 days in continuously aerated SBRs.
    • Significant nitrite accumulation was maintained at longer SRTs (5 days) with combined aeration/non-aeration cycles, enabling subsequent denitrification.

    Conclusions:

    • Direct biological removal of nitrite to nitrogen gas is feasible by strategically controlling SBR operational parameters.
    • Optimized aeration and non-aeration periods, coupled with appropriate SRT, can facilitate nitrite accumulation and subsequent denitrification.
    • This approach offers a potential pathway for enhanced biological nitrogen removal from wastewater.