Ammonium removal of drinking water at low temperature by activated carbon filter biologically enhanced with heterotrophic nitrifying bacteria

2015 ◽  
Vol 23 (5) ◽  
pp. 4650-4659 ◽  
Author(s):  
Wen Qin ◽  
Wei-Guang Li ◽  
Duo-Ying Zhang ◽  
Xiao-Fei Huang ◽  
Yang Song
2010 ◽  
Vol 62 (7) ◽  
pp. 1518-1525 ◽  
Author(s):  
Hongyu Wang ◽  
Jiajie He ◽  
Kai Yang

This study evaluated the partial nitrification performances of two biofilm filters over a synthetic non-ammonium-rich wastewater at a 20°C room temperature under both limited DO (∼2.0 mg/L) and unlimited DO (∼4.0 mg/L) conditions. The two filters were each of 80 cm long and used different biofilm carriers: activated carbon and ceramic granule. Results showed that partial nitrification was accomplished for both filters under the limited DO condition. However, the effluent NO2-N was higher in the ceramic granule filter than in the activated carbon filter, and was less susceptible to the influent COD/N changes. Further investigation into the water phase COD and NH4-N depth profiles and bacteria population within the two filters showed that by putting upper filter layer (upstream) to confront relatively higher influent COD/N ratios, the filtration process naturally put lower filter layers (downstream) relatively more favorable for nitrifying bacteria (ammonia oxidizing bacteria in this study) to prosper, making the filter depth left for nitrification a crucial factor for the effectiveness of nitrification with a filter. The potentially different porous flow velocities of the two filters might be the reason to cause their different partial nitrification performances, with a lower porous flow velocity (the ceramic granule filter) favoring partial nitrification more. In summation, DO, filter depth, and filtration speed should be played together to successfully operate a biofilm filter for partial nitrification.


2013 ◽  
Vol 85 ◽  
pp. 701-708 ◽  
Author(s):  
Duo-Ying Zhang ◽  
Wei-Guang Li ◽  
Hai-Nan Gong ◽  
Lei Zhang ◽  
Xu-Jin Gong ◽  
...  

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