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.

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.

Biological nitrogen removal using bio-sorbed internal organic carbon from piggery wastewater in a post-denitrification MLE process

2004 ◽  
Vol 49 (5-6) ◽  
pp. 373-386 ◽  
Author(s):  
S.-M. Park ◽  
H.-B. Jun ◽  
Y.-J. Chung ◽  
S.-H. Lee
Keyword(s):  
Organic Matter ◽  
Nitrogen Removal ◽  
Nitrate Reduction ◽  
Hydraulic Retention Time ◽  
Carbon Sources ◽  
Synthetic Wastewater ◽  
Biological Nitrogen Removal ◽  
Nitrification Rate ◽  
Piggery Wastewater ◽  
Biological Nitrogen

Nitrogen removal from a piggery wastewater was investigated in a post-denitrification modified Lüdzack Ettinger (PDMLE) process. Overall hydraulic retention time (HRT) of the PDMLE, consisting of contact/separator (C/S), nitrification, denitrification and re-aerobic bioreactor was 10 days. 60% of the influent SCOD was separated in the C/S by contacting the return sludge with the synthetic wastewater, however, only 10% of the influent SCOD was separated from the piggery wastewater. Biosorption capacities of the synthetic wastewater and piggery wastewater were 800 and 150 mg/g-MLSS, respectively. In spite of the high organic and nitrogen load, nitrification efficiency was above 95%, and nitrification rate was about 180 mg-NH4+-N/L·day. The removed ΔCOD/Δnitrate ratios in the denitrification tank were 4.0 and 11.5 g-SCOD/g-nitrate, while denitrification rates were 8.4 and 2.6 mg-nitrate/day for synthetic and piggery wastewater, respectively. In the proposed PDMLE process, both bio-sorbed and bypassed organic matter could be successfully used for nitrate reduction as carbon sources and the final TN removal efficiency was as high as 95%.

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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