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Variation of Nitrogen Removal Efficiency and Microbial Communities Depending on Operating Conditions of a CANON Process

CANON 공정에서 운전조건에 따른 질소 제거효율 및 미생물군집 변화

  • Received : 2015.04.03
  • Accepted : 2015.06.20
  • Published : 2015.06.30

Abstract

Nitrogen removal is one of the most important issues about wastewater treatment because nitrogen is a primary pollutant caused various problems such as eutrophication. We developed a CANON microbial community by using AOB and ANAMMOX bacteria as seeding sources. When 100 mg-N/L of influent ammonium was supplied, the DO above 0.4 mg/L showed a very low TN removal efficiency while the DO of 0.3 mg/L showed TN removal efficiency as high as 71.3%. When the influent ammonium concentration was reduced to 50 mg/L, TN removal efficiency drastically deceased. However, TN removal efficiency was recovered to above 70% after 14 day operation when the influent nitrogen concentration was changed again from 50 mg-N/L to 100 mg-N/L. According to the operating temperature from $37{\pm}1^{\circ}C$ to $20{\pm}1^{\circ}C$, TN removal efficiency also rapidly decreased but gradually increased again up to $70.0{\pm}2.6$%. The analysis of PCR-DGGE showed no substantial difference in microbial community structures under different operational conditions. This suggests that if CANON sludge is once successfully developed from a mixture of AOB and ANAMMOX bacteria, the microbial community can be stably maintained regardless of the changes in operational conditions.

Keywords

CANON;ANAMMOX;Partial Nitrification;Microbial Community

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