Étude comparative de trois modèles dynamiques de boues activées

1989 ◽  
Vol 16 (3) ◽  
pp. 400-407 ◽  
Author(s):  
D. Couillard ◽  
F. D'amours ◽  
G. Patry
Keyword(s):  
Mathematical Model ◽  
Sensitivity Analysis ◽  
Water Treatment ◽  
Activated Sludge ◽  
Organic Nitrogen ◽  
Dynamic Models ◽  
Dynamic Modelling ◽  
Activated Sludge Process ◽  
Transient Behaviour ◽  
Soluble Material

Three complete dynamic models are proposed to simulate the transient behaviour of the activated sludge process. The authors compare the responses obtained by simulation with datas found in the literature for the Norwich wastewater plant (England). A structured biological model with bi-substrate component (particles and soluble material) together with a nitrification model taking into account the organic nitrogen content of the affluent present the most realistic profils for the conditions studied. A sensitivity analysis reveals that a generalization of the model is possible if some parameters identified as critical are adjusted. Key words: mathematical model, activated sludge, water treatment, dynamic modelling, comparison of models.

Enhanced biodegradation of organic nitrogenous compounds in resin manufacturing wastewater by anoxic denitrification and oxic nitrification process

1996 ◽  
Vol 34 (10) ◽  
pp. 35-41 ◽  
Author(s):  
Cheng Sheng-shung ◽  
Lin Yuh-Tarng ◽  
Chen Sheng-Kun
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Organic Nitrogen ◽  
Activated Sludge Process ◽  
Nitrogenous Compounds ◽  
Conventional Activated Sludge ◽  
Study Results ◽  
Nitrification Process ◽  
Enhanced Biodegradation ◽  
Conventional Activated Sludge Process

In this study, a stream of resin manufacturing wastewater with high contents of organic nitrogenous compounds was treated by a conventional activated sludge process with extended aeration and a modified anoxic denitrification unit followed with two oxic activated sludge units respectively. Performance comparison of these two processes showed that the enhanced biodegradation of organic nitrogen in the modified process was attained with 69.0% of organic nitrogen removal that related to 39.0% removal in the conventional process. The anoxic/oxic process also promoted the removal efficiencies of COD, TKN and TN (total nitrogen) from 91%, 49.6% and 7.4% to 95.3%, 83.8% and 74.4% respectively, in comparison with the conventional extended activated sludge process. These cheerful results also corresponded to the acceptable averaged effluent quality: 82 mg/l of CODs, 48 mg/l of Org.-N, 11 mg/l of NH4+-N, and 42 mg N/l of NO3−-N, that could meet the national effluent standard of ROC-EPA in 1998. The successful investigation also demonstrated that about 50% of the total organic nitrogen removal was achieved in the anoxic unit associated with denitrification, while the residual organic nitrogen was removed in the oxic unit. The pilot-study results suggested that the resin manufacturing wastewater containing high concentration of organic nitrogen should be treated by the anoxic denitrification and oxic nitrification process instead of the conventional activated sludge process with extended aeration.

Effect of Influent Nitrogen Speciation on Organic Nitrogen Occurrence in Activated Sludge Process Effluents

2011 ◽  
Vol 83 (8) ◽  
pp. 761-766 ◽  
Author(s):  
K. Pagilla ◽  
C. Sattayatewa ◽  
M. Urgun-Demirtas ◽  
S. Baek
Keyword(s):  
Activated Sludge ◽  
Organic Nitrogen ◽  
Activated Sludge Process
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