Biological nitrogen removal from municipal landfill leachate: low-cost nitrification in biofilters and laboratory scale in-situ denitrification

2002 ◽  
Vol 36 (16) ◽  
pp. 4079-4087 ◽  
Author(s):  
J.P.Y Jokela ◽  
R.H Kettunen ◽  
K.M Sormunen ◽  
J.A Rintala
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Low Cost ◽  
Laboratory Scale ◽  
Biological Nitrogen Removal ◽  
Municipal Landfill ◽  
Biological Nitrogen

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.

Enhancing biological nitrogen removal in a small wastewater treatment plant by regulating the air supply

2004 ◽  
Vol 48 (11-12) ◽  
pp. 445-452 ◽  
Author(s):  
M. Fiter ◽  
J. Colprim ◽  
M. Poch ◽  
I. Rodríguez-Roda
Keyword(s):  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Low Cost ◽  
Treatment Plant ◽  
Biological Nitrogen Removal ◽  
Air Supply ◽  
Safety Margins ◽  
Biological Nitrogen

Most of the small wastewater treatment plants in Catalonia were not designed to remove nutrients. However, the large safety margins built into their original engineering design has meant that, in many cases, it has been possible to remove part of the nitrogen without being controlled. This paper focuses on the practical experience carried out in one of these facilities, the Bisbal wastewater treatment plant, aimed at enhancing the biological nitrogen removal using simple, low-cost, easy-to-operate measurement and control. The control strategy, which is based on air supply regulation, was previously designed using simulation studies. A dissolved oxygen monitoring system was installed into the facility, while nitrogen concentrations were analysed every day. Optimal dissolved oxygen profiles in the oxidation ditch were identified, while the air supply strategy was modified according to the variations in the influent.

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