Effect of oxygen concentration on nitrification and denitrification in single activated sludge flocs

被引：90

作者：

Satoh, H

Nakamura, Y

Ono, H

Okabe, S

机构：

[1] Hachinohe Inst Technol, Dept Civil & Environm Engn, Hachinohe, Aomori 0318501, Japan

[2] Hokkaido Univ, Grad Sch Engn, Dept Urban & Environm Engn, Sapporo, Hokkaido, Japan

来源：

BIOTECHNOLOGY AND BIOENGINEERING | 2003年 / 83卷 / 05期

关键词：

single activated sludge flocs; O-2; concentration; nitrification; denitrification; microelectrodes;

D O I：

10.1002/bit.10717

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

Simultaneous nitrification and denitrification (SND) was investigated in the single aeration tank of a municipal wastewater treatment plant. Microelectrode measurements and batch experiments were performed to test for the presence of SND. Microelectrodes recorded the presence of O-2 concentration gradients in individual activated sludge flocs. When the O-2 concentration in the bulk liquid was <45 μM, anoxic zones were detected within flocs with a larger diameter (approximately 3000 pm). The O-2 penetration depth in the floc was found to be dependent on the O-2 concentration in the bulk liquid. Nitrification was restricted to the oxic zones, whereas denitrification occurred mainly in the anoxic zones. The nitrification rate of the activated sludge increased with increasing O-2 concentration in the bulk liquid, up to 40 μM, and remained constant thereafter. SND was observed in the aerated activated sludge when O-2 concentration was in the range of 10 to 35 μM. (C) 2003 Wiley Periodicals, Inc.

引用

页码：604 / 607

页数：4

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