Modes of operation and pH control as enhancement factors for partial nitrification with oxygen transport limitation

被引：82

作者：

Ciudad, G. ^{[1
]}

Gonzalez, R. ^{[1
]}

Bornhardt, C. ^{[1
]}

Antileo, C. ^{[1
]}

机构：

[1] Univ La Frontera, Dept Chem Engn, Temuco, Chile

来源：

WATER RESEARCH | 2007年 / 41卷 / 20期

关键词：

SBR; rotating disk biofilm reactor; partial nitrification; pH control; oxygen limitation;

D O I：

10.1016/j.watres.2007.06.036

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Sequencing batch (SBR) and continuous operation modes were applied using different pH control strategies to enhance partial nitrification in a biofilm rotating disk reactor. The pH control strategies were supervisory control in the range of 7.5-8.6 and fixed pH at 7.5 and 8.5, at dissolved oxygen (DO) concentrations in the range of 0.6-5.0 mg O-2/L. Supervisory pH control enabled operation at a free ammonia concentration inhibitory to the nitrite-oxidizing bacteria (NOB) and an optimum for the ammonia-oxidizing bacteria (AOB). The results indicate that both operation modes were simultaneously controlled by oxygen transport and micro-kinetics (influenced by pH and NH3). The SBR mode with supervisory pH control presented more stable partial nitrification-nitrite accumulation > 80% for 249 days than continuous operation. Molecular analyses showed that the SBR operation with supervisory pH control at low DO concentrations contributed to the enrichment of the AOB (> 95%) over the NOB (< 5%) populations. Therefore, it can be stated that a suitable pH control strategy can act as an enhancement factor of partial nitrification even under oxygen-transport-limiting conditions. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：4621 / 4629

页数：9

共 29 条

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