4.8 Article

Start up partial nitrification at low temperature with a real-time control strategy based on blower frequency and pH

Journal

BIORESOURCE TECHNOLOGY
Volume 112, Issue -, Pages 34-41

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.12.028

Keywords

Blower frequency; pH; Partial nitrification; Low temperature conditions; Real-time control

Funding

  1. National Key Technologies R&D Program of China [2009BAC57B01]
  2. State Key Laboratory of Urban Water Resource and Environment (HIT) [QAK200802]

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In this study, the performance of partial nitrification via nitrite at low temperature was investigated in a pilot-scale sequencing batch reactor (SBR) with a working volume of 7.0 m(3). A novel real-time control strategy, based on blower frequency (BF) and pH, was designed and evaluated. The nitrogen break point (NBP) in the BF curve and the nitrate/nitrite apex point (NAP) in the pH curve were used to identify the endpoint of the aerobic and anoxic phases, respectively. The nitrite accumulation rate (NAR) rapidly increased from 19.8% to 90%. Partial nitrification was achieved at low temperature (11-16 degrees C) in 40 days and was stably maintained for as long as 140 days by applying a real-time control strategy based on pH and BF. Fluorescence in situ hybirdization (FISH) results demonstrated that ammonia oxidation bacteria (AOB) had developed into the dominant nitrifying bacteria compared to nitrite oxidation bacteria (NOB) in the system. (C) 2011 Elsevier Ltd. All rights reserved.

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