Simulation and optimization of a full-scale Carrousel oxidation ditch plant for municipal wastewater treatment

2011 ◽  
Vol 56 (1-2) ◽  
pp. 9-16 ◽  
Author(s):  
Wen-Ming Xie ◽  
Rui Zhang ◽  
Wen-Wei Li ◽  
Bing-Jie Ni ◽  
Fang Fang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Full Scale ◽  
Municipal Wastewater Treatment ◽  
Oxidation Ditch ◽  
Simulation And Optimization ◽  
Carrousel Oxidation Ditch

Potentials and limits of a pre-denitrification/nitrification biofilter configuration for advanced municipal wastewater treatment

2007 ◽  
Vol 55 (8-9) ◽  
pp. 115-123 ◽  
Author(s):  
E. Rother ◽  
P. Cornel
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Organic Substrate ◽  
Full Scale ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewaters ◽  
Stage 1 ◽  
Recycle Rate

Pre-denitrification in biofilters is limited by the amount of easily degradable organic substrate, resulting in relatively high requirements for external carbon. The combination of pre-DN, N and post-DN filters is much more advisable for most municipal wastewaters, because the recycle rate can be reduced and external carbon can be saved. For minimum use of external carbon, 100–150% recycle rate should not be exceeded. Then, approximately 50–60% of the total NO3-N can be depleted in the pre-DN stage. On average, 10 g total (t) COD/g NO3-N were required in the pre-DN stage for denitrification in the pilot and full-scale plant and 0.4–0.5 kg NO3-N/(m3DN d) can be reached without external carbon. As only 40–70% of the COD load is eliminated in the pre-DN, the remaining COD load is removed in the nitrification stage. 1 kg COD/(m3 d) suppresses nitrification rates by approximately 0.1 kg NH4-N/(m3 d). For nitrification rates, >0.5 kg NH4N/(m3 d) at 12°C not more than 2 kg COD/(m3N d) may be eliminated in the nitrification.

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