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microelectrodes 2

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activated sludge flocs 1

aerobic ammonium-oxidizing bacteria 1

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Microprofiles of activated sludge aggregates using microelectrodes in completely autotrophic nitrogen

Yongtao LV,Xuan CHEN,Lei WANG,Kai JU,Xiaoqiang CHEN,Rui MIAO,Xudong WANG

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 2, Pages 390-398 doi: 10.1007/s11783-015-0818-6

Abstract: inside the sludge aggregates, microprofiles were measured using pH, dissolved oxygen (DO), , and microelectrodes

Keywords： microelectrodes CANON aerobic ammonium-oxidizing bacteria anaerobic ammonium-oxidizing bacteria nitrite-oxidizing

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Micro-analysis of nitrogen transport and conversion inside activated sludge flocs using microelectrodes

Lei WANG, Yongtao LV, Xudong WANG, Yongzhe YANG, Xiaorong BAI

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 4, Pages 633-638 doi: 10.1007/s11783-011-0329-z

Abstract: To investigate the nitrogen transport and conversion inside activated sludge flocs, micro-profiles of O , NH , NO , NO , and pH were measured under different operating conditions. The flocs were obtained from a laboratory-scale sequencing batch reactor. Nitrification, as observed from interfacial ammonium and nitrate fluxes, was higher at pH 8.5, than at pH 6.5 and 7.5. At pH 8.5, heterotrophic bacteria used less oxygen than nitrifying bacteria, whereas at lower pH heterotrophic activity dominated. When the ratio of C to N was decreased from 20 to 10, the ammonium uptake increased. When dissolved oxygen (DO) concentration in the bulk liquid was decreased from 4 to 2 mg·L , nitrification decreased, and only 25% of the DO influx into the flocs was used for nitrification. This study indicated that nitrifying bacteria became more competitive at a higher DO concentration, a higher pH value (approximately 8.5) and a lower C/N.

Keywords： nitrogen transport activated sludge flocs heterotrophic bacteria nitrifying bacteria microelectrodes