A Study on the Ammonia Removal Mechanisms for the A/O Biological Nitrogen Removal Process with the Enhancement of the Zeolite

2011 ◽  
Vol 322 ◽  
pp. 52-56 ◽  
Author(s):  
Guan Wen Cheng ◽  
Wen Yuan Wei ◽  
Guo Dan Lu ◽  
Zhi Chao Wu ◽  
Xiang Feng Huang ◽  
...  
Keyword(s):  
Ammonia Removal ◽  
Biological Nitrogen Removal ◽  
Secondary Treatment ◽  
Activated Sludge Process ◽  
Adsorbate Concentration ◽  
Oxic Zone ◽  
Carbon Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Anaerobic Zone ◽  
Biological Nitrogen

This paper mainly studied on using activated sludge process with zeolite to upgrade the traditional secondary treatment plants. In this process, zeolite acted as ammonian sorbent and microbial carrier firstly, and then composed zeolite and biological complex to improve denitrification of anaerobic zone and nitrification of oxic zone. In the anaerobic zone, the influent contained a lot higher ammonian concentration. The zeolite adsorbed ammonian, it increased carbon nitrogen ratio and facilitated denitrification. While in the oxic zone, adsorbate concentration of mixed liquid decreased owing to biodegra dation by the action of salinity and microorganism. Thus, it striked a balance between adsorption and desorption of zeolite with ammonium, and zeolite with ammonium released constantly ammonian to renew.

Biological Nitrogen Removal Activated Sludge Process in Warm Climates

2015 ◽  
Vol 7 (0) ◽  
pp. 9781780401904-9781780401904
Author(s):  
C. Y. Shi ◽  
W. Y. Long ◽  
A. C. Meng ◽  
K. S. Raajeevan
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Biological Nitrogen Removal ◽  
Activated Sludge Process ◽  
Biological Nitrogen ◽  
Warm Climates

Nitrogen removal from pharmaceutical manufacturing wastewater via nitrite and the process optimization with on-line control

2004 ◽  
Vol 50 (6) ◽  
pp. 25-30 ◽  
Author(s):  
Y.Z. Li ◽  
C.Y. Peng ◽  
Y.Z. Peng ◽  
P. Wang
Keyword(s):  
Nitrogen Removal ◽  
Low Cost ◽  
Selective Inhibition ◽  
Ammonia Removal ◽  
Pharmaceutical Manufacturing ◽  
Biological Nitrogen Removal ◽  
On Line ◽  
Biological Nitrogen ◽  
Study Laboratory ◽  
Easy Operation

In this study, laboratory scale experiments were conducted to investigate the nitrogen removal from pharmaceutical manufacturing wastewater. The results indicate that by selective inhibition of free ammonia on oxidizers, nitrogen removal can be achieved by nitritation and denitritation process. The nitrite ratio was above 98% in the aerobic stage and the nitrogen removal efficiency was about 99%. The complete ammonia removal corresponded exactly to the “Ammonia Valley” in the pH versus time graphic and the anoxic reaction was completed when the “Nitrite Knee” appeared in the ORP versus time graphic. Optimization of the SBR cycle by step-feed and on-line control with pH and ORP strategy allowed the carbon and energy saving. The easy operation and the low cost make the SBR system an interesting option for the biological nitrogen removal from the pharmaceutical manufacturing wastewater.

Assessment of nitrification-denitrification potential of istanbul domestic wastewaters

1994 ◽  
Vol 30 (6) ◽  
pp. 21-30 ◽  
Author(s):  
Derin Orhon ◽  
Seval Sözen ◽  
Emine Ubayo
Keyword(s):  
Specific Growth ◽  
Rate Coefficients ◽  
Biological Nitrogen Removal ◽  
Correction Factors ◽  
Biological Growth ◽  
Carbon To Nitrogen Ratio ◽  
Autotrophic Biomass ◽  
Nitrogen Ratio ◽  
Characterization Studies ◽  
Biological Nitrogen

This paper summarizes experimental evaluations on Istanbul domestic wastewaters with respect to their potential of biological nitrogen removal. Characterization studies involve together with relevant carbonaceous and nitrogenous wastewater components, significant rate coefficients affecting aerobic and anoxic processes. Experimental results indicate a low biodegradable carbon to nitrogen ratio and a relatively small readily biodegradable COD fraction. A new method is introduced to determine maximum specific growth rate for autotrophic biomass. Correction factors for biological growth and hydrolysis under anoxic conditions are also assessed. The latter is found to be significantly higher than values proposed in the literature.

Feedforward control of the external carbon flow rate in an activated sludge process

2001 ◽  
Vol 43 (1) ◽  
pp. 115-122 ◽  
Author(s):  
P. Samuelsson ◽  
B. Carlsson
Keyword(s):  
Activated Sludge ◽  
Flow Rate ◽  
Feedforward Control ◽  
Nitrate Concentration ◽  
Carbon Flow ◽  
Biological Nitrogen Removal ◽  
Biological Processes ◽  
Activated Sludge Process ◽  
Process Disturbances ◽  
Biological Nitrogen

Biological nitrogen removal in an activated sludge process is obtained by two biological processes: nitrification and denitrification. Denitrifying bacteria need sufficient amounts of readily metabolized carbon. The objective of this paper is to develop an automatic control strategy for adjusting the external carbon flow rate so that the nitrate concentration in the last anoxic compartment is kept at a low pre-specified level. A simple model based feedforward control combined with a standard feedback PI controller is suggested. Simulation results show that the suggested controller, despite being simple, effectively attenuates process disturbances.

Sign in / Sign up

Export Citation Format

Share Document