Biological Nitrogen Removal System for Strong Contaminated Wastewater

2004 ◽  
Vol 2004.14 (0) ◽  
pp. 312-314
Author(s):  
Naomichi Mori ◽  
Takanori Oshikiri ◽  
Tatsuo Sumino
Keyword(s):  
Nitrogen Removal ◽  
Biological Nitrogen Removal ◽  
Biological Nitrogen ◽  
Removal System

Nitrification Treatability of Whole Microorganisms Immobilized by the PVA-Freezing Method

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2397-2400 ◽  
Author(s):  
H. Asano ◽  
H. Myoga ◽  
M. Asano ◽  
M. Toyao
Keyword(s):  
Nitrogen Removal ◽  
Fixed Bed ◽  
Biological Nitrogen Removal ◽  
Freezing Method ◽  
Immobilized Microorganisms ◽  
Volumetric Loading ◽  
Biological Nitrogen ◽  
Removal System

We used whole microorganisms immobilized by the PVA-freezing method (in order to prevent microorganism wash-out) to investigate the efficiency of nitrification. In general, denitrified or oxidized effluents are recycled to the nitrification tank to provide alkalinity control in biological nitrogen removal systems. We found that allowable volumetric loading during nitrification was different for the recycling and once-through operations, using a biofilm nitrogen removal system in a fixed bed. Then, the nitrification efficiency of a recycling operation in a biological nitrogen removal system was compared with that of a once-through operation, using immobilized microorganisms. The results showed that the ratio of allowable volumetric loading in the recycling operation was 60% of that in the once-through operation.

Development of New Nitrogen Removal System Using Nitrifying Bacteria Immobilized in Synthetic Resin Pellets

1991 ◽  
Vol 23 (4-6) ◽  
pp. 681-690 ◽  
Author(s):  
Kazuhiro Tanaka ◽  
Minoru Tada ◽  
Takashi Kimata ◽  
Shouji Harada ◽  
Yuhko Fujii ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Synthetic Polymer ◽  
Nitrifying Bacteria ◽  
Biological Nitrogen Removal ◽  
Synthetic Resin ◽  
Treatment Performance ◽  
Microorganism Immobilization ◽  
Biological Nitrogen ◽  
Immobilization Method ◽  
Removal System

A newly developed process applying a technique of microorganism immobilization to biological nitrogen removal is reported. Nitrifiers immobilized in 2 to 3 mm diameter polyethylene-glycol resin (Nitrifying pellets) are mixed with activated sludge in the nitrification tanks to promote quick nitrification. Due to the high nitrifying activity of the pellets, nitrification of municipal wastewaters is completed within a few hours. This paper introduces the synthetic polymer and immobilization method suited to nitrifiers, the conditions for pellet fluidization, the activity of nitrifying pellets and its treatment performance as a nitrogen removal process.

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