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Comparative Study
, 90 (3), 457-62

Comparison of Aerobic Denitrification Under High Oxygen Atmosphere by Thiosphaera Pantotropha ATCC 35512 and Pseudomonas Stutzeri SU2 Newly Isolated From the Activated Sludge of a Piggery Wastewater Treatment System

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Comparative Study

Comparison of Aerobic Denitrification Under High Oxygen Atmosphere by Thiosphaera Pantotropha ATCC 35512 and Pseudomonas Stutzeri SU2 Newly Isolated From the Activated Sludge of a Piggery Wastewater Treatment System

J J Su et al. J Appl Microbiol.

Abstract

Aims: This study compares the ability of Thiosphaera pantotropha ATCC 35512 and the newly isolated Pseudomonas stutzeri SU2 to perform aerobic denitrification.

Methods and results: Nitrate-supplemented basal medium in airtight crimp-sealed serum bottles containing an atmosphere of 92% oxygen was inoculated with Ps. stutzeri SU2 or T. pantotropha and incubated at 30 degrees C. During the 92-h incubation period, aerobic denitrification by Ps. stutzeri SU2 (NO3(-) - N removal 99.24%) was more efficient than that by T. pantotropha (NO3(-) - N removal 27.29%).

Conclusion: Pseudomonas stutzeri SU2, which was isolated from the activated sludge of a sequencing batch reactor treating piggery wastewater, rapidly reduced the nitrate to nitrogen gas without nitrite accumulation. The nitrate removal rate of SU2 was 0.032 mmol NO3(-) - N g cell-1 h-1 after 44 h incubation.

Significance and impact of the study: Pseudomonas stutzeri SU2 can be used in a full-scale sequencing batch system for efficient in situ aerobic nitrate removal from piggery wastewater.

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