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High-rate partial nitritation using porous poly(vinyl alcohol) sponge.

Hyokwan Bae1, Heejeong Yang, Yun-Chul Chung

  • 1Center for Water Resource Cycle Research, Korea Institute of Science and Technology, 39-1 Hawolgok-Dong, Seongbuk-Gu, Seoul, 136-791, Republic of Korea.

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Summary

Poly(vinyl alcohol) sponge cubes effectively immobilize nitrifying bacteria for partial nitritation. Optimal conditions achieved a high nitrogen conversion rate, demonstrating efficient wastewater treatment potential.

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Area of Science:

  • Environmental Microbiology
  • Biotechnology
  • Wastewater Treatment

Background:

  • Poly(vinyl alcohol) (PVA) is used for immobilizing nitrifying bacteria.
  • Comprehensive surveys of partial nitritation using PVA supports are lacking.

Purpose of the Study:

  • To investigate nitrifier activity and nitrogen conversion rates for partial nitritation using PVA sponge-cubes.
  • To optimize conditions for stable partial nitritation and efficient ammonia oxidation.

Main Methods:

  • Selective enrichment of ammonia-oxidizing bacteria (AOB) on PVA sponge-cubes via dissolved oxygen competition.
  • Varying bicarbonate concentration and PVA sponge-cube dimensions to assess impact on nitritation.
  • Determining the maximum nitrogen conversion rate under optimized conditions.

Main Results:

  • AOB enrichment was achieved through competition for dissolved oxygen.
  • Ammonia oxidation efficiency correlated with bicarbonate concentration (HCO3(-)-C/NH4(+)-N ratio of 1.91).
  • Maximum nitrogen conversion rate (3.09 kg N/m(3) day) was dependent on sponge-cube volume, not size, at a 32% packing ratio.

Conclusions:

  • PVA sponge-cubes are effective supports for partial nitritation.
  • Optimized conditions, including bicarbonate concentration and sponge-cube volume, enhance nitrogen conversion rates.
  • This method shows significant potential for efficient wastewater nitrogen removal.