scholarly journals Start-up of the Single Stage Nitrogen Removal System Using Anammox Granules and Its Affecting Factors

2006 ◽  
Vol 42 (1) ◽  
pp. 17-25
Author(s):  
URARA IMAJO ◽  
YOHEI KAWANO ◽  
KENJI FURUKAWA
Keyword(s):  
Nitrogen Removal ◽  
Single Stage ◽  
Affecting Factors ◽  
Start Up ◽  
Removal System

Fast start-up of PN/A process in a single-stage packed bed and mechanism of nitrogen removal

2020 ◽  
Vol 27 (32) ◽  
pp. 40483-40494
Author(s):  
Yaqi Xie ◽  
Chuanyi Zhang ◽  
Limei Yuan ◽  
Qieyuan Gao ◽  
Hai Liang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Packed Bed ◽  
Single Stage ◽  
Start Up ◽  
Fast Start

Start-Up and Cultivation of A2N Denitrifying Phosphorus and Nitrogen Removal System

2012 ◽  
Vol 610-613 ◽  
pp. 1454-1458
Author(s):  
Ming Fen Niu ◽  
Hong Jing Jiao ◽  
Li Xu ◽  
Yan Yu ◽  
Jian Wei
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Nitrogen And Phosphorus ◽  
Start Up ◽  
Two Phases ◽  
Removal System

A2N is two-sludge system, by using the method that first bringing up the cultivation of denitrifying phosphorus removing bacteria (DPB) and nitrification biofilm separately then connecting them, which can start up A2N system successfully. Nitrification biofilm was cultivated in a sequencing batch reactor (SBR). After 30 days, NH4+-N effluent concentration steadily stayed below 0.5mg·L-1.In another SBR, the activated sludge for the enrichment of DPB is from the anaerobic tank, which was firstly operated under anaerobic/aerobic (A/O) condition. After 20 days, PAOs was successfully enriched. Then, the activated sludge was conducted under anaerobic/anoxic/aerobic (A/A/O) condition, maintaining the anaerobic time, gradually increased anoxic time and induced aerobic time. After 30 days DPB was successfully enriched, two phases totally take 50 days. The removal efficiency of total nitrogen and phosphorus are above 85 % and 95 %, so that A2N system was started up successfully.

Long-term experiences with external carbon sources for nitrogen removal

1996 ◽  
Vol 33 (12) ◽  
pp. 109-116 ◽  
Author(s):  
Ulf Nyberg ◽  
Bengt Andersson ◽  
Henrik Aspegren
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Carbon Sources ◽  
Adaptation Period ◽  
Operational Flexibility ◽  
Start Up ◽  
Full Effect ◽  
Very High ◽  
Removal System

Methanol and ethanol have been used for three years as external carbon sources in a nutrient removal system based on pre-precipitation and post-denitrification in a single sludge activated sludge plant. Based on these long-term experiences it has been shown that the nitrogen standards of 8 mg N/l in the effluent wastewater can be met with both carbon sources. The process entails operational flexibility and the possibility to optimize the nitrogen removal due to seasonal variations in influent wastewater characteristics. Very high specific nitrate utilization rates were measured in the system with the use of external carbon sources. Rates of around 10 mg N/g VSS.h were reached with ethanol and around 3 mg N/g VSS.h with methanol. These rates were much higher than experienced in a pre-denitrification system with the use of the influent organic material as carbon source for denitrification. A start-up with the addition of ethanol led to a direct response of the system while a start-up with methanol resulted in a much longer adaptation period before full effect of the carbon source added was reached.

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