NDLI: Effect of C/N Ratio on Nitrogen Removal in a Novel Sequencing Batch Biofilm Reactor

Content Provider	IEEE Xplore Digital Library
Author	Dahu Ding Chuanping Feng Yunxiao Jin
Copyright Year	2010
Abstract	A novel laboratory-scale sequencing batch biofilm reactor (SBBR) based on an intelligent controlling system (ICS) was subjected to synthetic wastewater with different C/N (COD/TN) ratios (3.8, 6.8, 12.5, 22.0) respectively to investigate the effect of C/N ratio on nitrogen removal and furthermore the simultaneous nitrification and denitrification (SND) in the reactor. A special kind of biological sponge with porosity of 98% was used as biofilm carrier in the reactor. The experimental results indicated that the C/N ratio of 12.5 was optimal to the simultaneous removal of nitrogen and COD in SBBR, and the removal efficiencies of ammonia nitrogen (NH3-N), total nitrogen (TN) and COD were 90.1%, 87.4% and 94.8%, respectively. It was also deduced that the initial decrease of NH3-N was ascribed from the adsorption of the biofilm formed on the carriers. In addition, the microorganisms grown in the biofilm also had a large capacity of storing carbon source, resulted in the sharp decrease in COD at the beginning of the operation, so the carbon source could be subsequently provided for denitrification. When the C/N ratio was 12.5, no accumulation of NO3--N or NO2--N was detected, and removal efficiency of TN was 87.4%, while 80.3%, 79.1% and 37.5% at C/N ratio of 3.8, 6.8 and 22.0, respectively, demonstrating the reactor had an efficient SND and the efficiency of SND reached 97.9%.
Starting Page	1
Ending Page	4
File Size	322149
Page Count	4
File Format	PDF
ISBN	9781424447121
ISSN	21517622
DOI	10.1109/ICBBE.2010.5517614
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Microorganisms Geology Phosphors Control systems Nitrogen Inductors Intelligent systems Wastewater treatment Water resources Thickness control
Content Type	Text
Resource Type	Article

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