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


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%).


CONCLUSIONS
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.


CONCLUSIONS
Pseudomonas stutzeri SU2 can be used in a full-scale sequencing batch system for efficient in situ aerobic nitrate removal from piggery wastewater.
Su
J J
JJ
Department of Production Management, Pig Research Institute Taiwan, Chunan, Miaoli, Taiwan, ROC. jjs01@ms9.hinet.net
Liu
B Y
BY
Liu
C Y
CY
D000332:Aerobiosis; D000822:Animal Husbandry; D003470:Culture Media; D006091:Gram-Negative Chemolithotrophic Bacteria / Q000254:growth & development / Q000378:metabolism*; D007220:Industrial Waste; D009566:Nitrates / Q000378:metabolism*; D010100:Oxygen / Q000494:pharmacology*; D011549:Pseudomonas / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid
D003470:Culture Media; D007220:Industrial Waste; D009566:Nitrates; D012722:Sewage; D010100:Oxygen