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Nitrogen oxidation and reduction in aerated single-stage activated sludge process

100%

Bernat K., Wojnowska-Baryla I., Dobrzynska A.

Polish Journal of Environmental Studies

2003

tom 12

nr 4

This experiment was conducted in an aerated single-stage reactor at activated sludge concentration of about 3000 mg· dm-3. The influence of hydraulic retention time on nitrogen removal from rural wastewater was investigated. Hydraulic retention times were 24 and 12 hours. Two series were performed at a constant C/N ratio of 3.5. Enhancement of carbon removal from 83.8% to 87.6% was observed. An increase of activated sludge loading from 0.11g COD · g-1 · d-1 to 0.25 g COD · g-1 · d-1 did not cause total inhibition of nitrifica-tion, but nitrification efficiency decreased from 78.8% to 55.5%. Higher nitrogen removal efficiency (52%) was achieved in series I at 24 hours reaction time in contrast to shorter one (42%). Despite the fully aerobic condition, denitrification was observed. The denitrification process was pos-sible due to the use of accessibility of high amount of readily bioassimilable organic compounds. Obtained denitrification efficiency at C/N ratio 3.5 was about 50% during both experimental periods..

Ograniczanie wyników

1 Polish Journal of Environmental Studies

1 Bernat K.

1 Dobrzynska A.

1 Wojnowska-Baryla I.

1 2003

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Nitrogen oxidation and reduction in aerated single-stage activated sludge process