Insights into chronic zinc oxide nanoparticle stress responses of biological nitrogen removal system with nitrous oxide emission and its recovery potential

2021 ◽  
Vol 327 ◽  
pp. 124797
Author(s):  
Jinyu Ye ◽  
Huan Gao ◽  
Carlos Domingo-Félez ◽  
Junkang Wu ◽  
Manjun Zhan ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Nitrous Oxide ◽  
Nitrogen Removal ◽  
Stress Responses ◽  
Biological Nitrogen Removal ◽  
Zinc Oxide Nanoparticle ◽  
Recovery Potential ◽  
Oxide Nanoparticle ◽  
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.

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