Nitrite accumulation and microbial behavior by seeding denitrifying phosphorus removal sludge for partial denitrification (PD): The effect of COD/NO3− ratio

2021 ◽  
Vol 323 ◽  
pp. 124524
Author(s):  
Miao Zhang ◽  
Jing Gao ◽  
Quanlong Liu ◽  
Yajun Fan ◽  
Chenjie Zhu ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Nitrite Accumulation ◽  
Denitrifying Phosphorus Removal

scholarly journals N2O Reduction During Denitrifying Phosphorus Removal With Propionate as Carbon Source

2021 ◽  
Author(s):  
Li Cong ◽  
Qian Wang ◽  
Wenlin Jia
Keyword(s):  
Carbon Source ◽  
Phosphorus Removal ◽  
Dominant Factor ◽  
Nitrite Accumulation ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
N2o Reduction ◽  
Denitrifying Phosphorus Removal ◽  
Factors Affecting ◽  
Mixed Carbon Source

Abstract Denitrifying phosphorus removal was realized in sequencing batch reactors using different carbons sources (acetate, propionate, and a mixture of acetate/propionate). Nutrient removal and N2O production were investigated, and the factors affecting N2O production were explored. Nitrogen removal was 40.6% lower when propionate was used as the carbon source instead of acetate, while phosphorus removal was not significantly different. N2O production was greatly reduced when propionate was used as the carbon source instead of acetate. The emission factor in the propionate system was only 0.43%, while those in the acetate and mixed-carbon source system were 16.3% and 1.9%, respectively. Compared to the propionate system, ordinary heterotrophic organisms (i.e., glycogen-accumulating organisms) were enriched in the acetate system, explaining the higher N2O production in the acetate system. The lower nitrite accumulation in the propionate system compared to the acetate system was the dominant factor leading to the lower N2O production.

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