Enhanced Nitrogen Removal of Low C/N Wastewater in a Subsequent Denitrifying Reactor Fed by Endogenous Carbon Source Generated from Primary Sludge Fermentation

2011 ◽  
Vol 281 ◽  
pp. 101-105
Author(s):  
Cheng Cheng Wu ◽  
Yong Zhen Peng ◽  
Liang Zhang ◽  
Shu Ying Wang
Keyword(s):  
Carbon Source ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
High Performance ◽  
Reduction Potential ◽  
Biological Nitrogen Removal ◽  
Primary Sludge ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Biological Nitrogen

A novel post-denitrification system fed by carbon source from primary sludge (PS) was used for enhancing biological nitrogen removal (BNR) of low C/N wastewater. This system included one anoxic/oxic (AO) reactor and a special reactor for simultaneous sludge fermentation and denitrification (Sifeden). Ammonia was nitrified to nitrate in AO and then the nitrate was reduced to dinitrogen in Sifeden , into which PS was added intermittently. Results showed that this system had high performance on nitrogen removal. Total nitrogen (TN) removal efficiency was higher than 85% and the effluent TN≤10mg/L in the condition of influent C/N≤2. In Sifeden, volatile fatty acid (VFA) produced from PS fermentation provided electron donor for nitrate reduction, and PS was preliminarily stabilized simultaneously. Oxidation-Reduction Potential (ORP) had a significant correlation with the denitrification performance. TN removal efficiency could be further improved if adopting proper PS addition strategy according to the ORP profiles.

A Short Review of Wastewater Biological Treatment at Low C/N ratio

2014 ◽  
Vol 962-965 ◽  
pp. 1490-1494
Author(s):  
Jian Zheng Li ◽  
Shuai Shi
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Biological Treatment ◽  
Carbon Sources ◽  
Short Review ◽  
Biological Nitrogen Removal ◽  
Removal Processes ◽  
Biological Nitrogen ◽  
Low Nitrogen ◽  
Wastewater Biological Treatment

Low nitrogen removal efficiency caused by the lack of carbon source in low C/N ratio wastewater restricts the wastewater biological treatment. Advances in wastewater biological treatment at low C/N ratio are reviewed in the paper from three aspects, including modifying traditional biological nitrogen removal process, developing novel biological nitrogen removal processes and optimizing traditional carbon source and developing new types of carbon sources. The mechanisms, advantages, and applications of these processes are also summarized and analyzed.

A Pilot-Scale Experimental Research on Biological Nitrogen Removal in a Modified SBR

2012 ◽  
Vol 550-553 ◽  
pp. 1156-1159
Author(s):  
Jun Li ◽  
Xue Bin Li ◽  
Jiong Hui Li
Keyword(s):  
Removal Efficiency ◽  
Experimental Research ◽  
Nitrogen Removal ◽  
Pilot Scale ◽  
Biological Nitrogen Removal ◽  
Urban Wastewater ◽  
Removal Ratio ◽  
N Efficiency ◽  
Biological Nitrogen

A pilot-scale modified SBR process was investigated to treat urban wastewater. The average NH4+-N efficiency removal was 98 %. The average TN removal efficiency was 52 %. The average effluent NH4+-N was 0.34 mg/L. The average effluent TN was 12 mg/L. The average effluent phosphorus was 0.75 mg/L. The average effluent COD was 35 mg/L. The result showed that the ratio of influent NH4+-N /TN was equal approximately to TN removal efficiency. The TN removal ratio was decided by the influent NH4+-N. The long anaerobic time was benefit to the nitrogen removal. The optimal anaerobic time should be set at 1 hour.

Hydrolyzed molasses as an external carbon source in biological nitrogen removal

2005 ◽  
Vol 96 (15) ◽  
pp. 1690-1695 ◽  
Author(s):  
Zhe-Xue Quan ◽  
Yin-Shu Jin ◽  
Cheng-Ri Yin ◽  
Jay J. Lee ◽  
Sung-Taik Lee
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Biological Nitrogen Removal ◽  
External Carbon Source ◽  
Biological Nitrogen
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