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Huan Jing Ke Xue. 2012 Oct;33(10):3501-6.

[Mechanism of nitrogen removal by partial nitrification-denitrification biological filter].

[Article in Chinese]

Author information

  • 1Department of Environmental Science and Engineering, School of Food and Chemical Engineering, Beijing Technology and Business University, Beijing 100048, China. syingxue@126.com

Abstract

The controlling factors for nitrite accumulation in partial nitrification and mechanism of nitrogen removal from the secondary effluent of wastewater treatment plant by partial nitrification-denitrification biological filter were investigated. The results showed that nitrite accumulated with increasing of pH value in the influent under the condition of temperature was (30 +/- 1) degrees C. The nitrite accumulation achieved to the highest at a pH value of 8.5 in this batch experiments. In addition, the nitrite accumulation presented increasing tendency through the up-flow nitrifying biological filter, which can be adjusted by the changes of pH and DO through the filter. The removal efficiency of NH4+ -N was over 90% by the partial nitrification-denitrification biological filter. Meanwhile, carbon sources were supplied for the denitrifying bacteria to accomplish denitrification process. Under the condition of COD/TN at a value of 3.0, the concentration of TN in the effluent of denitrifying biofilter was 8-9 mg x L(-1) and the removal efficiency achieved 79% - 81%, stably.

PMID:
23233980
[PubMed - indexed for MEDLINE]
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