Design, preparation, characterization, and application of MnxCu1-xOy/γ-Al2O3 catalysts in ozonation to achieve simultaneous organic carbon and nitrogen removal in pyridine wastewater

2021 ◽  
Vol 774 ◽  
pp. 145189
Author(s):  
Hongbin Jiang ◽  
Rao Zhang ◽  
Jialiang Hao ◽  
Xiaochen Xu ◽  
Jie Chen ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Nitrogen Removal ◽  
Carbon And Nitrogen

Modeling dynamics of organic carbon and nitrogen removal during aeration interruption in aerated horizontal flow treatment wetlands

2019 ◽  
Vol 80 (3) ◽  
pp. 597-606 ◽  
Author(s):  
Johannes Boog ◽  
Thomas Kalbacher ◽  
Jaime Nivala ◽  
Manfred van Afferden ◽  
Roland A. Müller
Keyword(s):  
Steady State ◽  
Organic Carbon ◽  
Dynamic Response ◽  
Nitrogen Removal ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Treatment Wetlands ◽  
Horizontal Flow ◽  
Simulation Accuracy ◽  
Carbon And Nitrogen

Abstract Despite recent developments in process-based modeling of treatment wetlands (TW), the dynamic response of horizontal flow (HF) aerated wetlands to interruptions of aeration has not yet been modeled. In this study, the dynamic response of organic carbon and nitrogen removal to interruptions of aeration in an HF aerated wetland was investigated using a recently-developed numerical process-based model. Model calibration and validation were achieved using previously obtained data from pilot-scale experiments. Setting initial concentrations for anaerobic bacteria to high values ( 35–70 mg L−1) and including ammonia sorption was important to simulate the treatment performance of the experimental wetland in transition phases when aeration was switched off and on again. Even though steady-state air flow rate impacted steady-state soluble chemical oxygen demand (CODs), ammonia nitrogen (NH4–N) and oxidized nitrogen (NOx–N) concentration length profiles, it did not substantially affect corresponding effluent concentrations during aeration interruption. When comparing simulated with experimental results, it is most likely that extending the model to include mass transfer through the biofilm will allow to better explain the underlying experiments and to increase simulation accuracy. This study provides insights into the dynamic behavior of HF aerated wetlands and discusses assumptions and limitations of the modeling approach.

scholarly journals Immobilized bioprocess for organic carbon and nitrogen removal

2012 ◽  
Vol 37 (1-3) ◽  
pp. 296-301 ◽  
Author(s):  
Chung-Hung Wang ◽  
James Cheng-Wei Liu ◽  
Kok-Kwang Ng ◽  
Cheng-Fang Lin ◽  
Pui-Kwan Andy Hong ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Nitrogen Removal ◽  
Carbon And Nitrogen

Organic Carbon and Nitrogen Removal in Attached-Growth Circulating Reactor (AGCR)

1990 ◽  
Vol 22 (3-4) ◽  
pp. 179-186 ◽  
Author(s):  
S. Karnchanawong ◽  
C. Polprasert
Keyword(s):  
Organic Carbon ◽  
Nitrogen Removal ◽  
Loading Rate ◽  
Oxygen Demand ◽  
Channel Length ◽  
Synthetic Wastewater ◽  
Attached Growth ◽  
Carbon And Nitrogen ◽  
Loading Rates ◽  
Air Diffusion

Experiments on attached-growth circulating reactor (AGCR) were conducted to investigate its efficiencies on organic carbon and nitrogen removal (through denitrification). A laboratory-scale AGCR, made of serpentine channel with a total length of 180.0 m, was fed with a synthetic wastewater at the chemical oxygen demand (COD) and total nitrogen (TN) loading rates of 3.56-10.16 and 0.30 - 0.91 g/(m2.d), respectively. The reactor effluent was recycled back to the influent feeding point and the dissolved oxygen (DO) concentrations along the channel length were controlled by means of air diffusion. It was found that the COD loading rate of 5 g/(m2. d) corresponding to the TN loading rate of 0.54 g/(m2.d) gave the optimal COD and TN removal rates of 4.8 and 0.43 g/(m2.d), respectively. The overall AGCR performance was limited by the nitrification efficiency at the high TN loading rates. The biofilm accumulation and thickness were found to be relatively high in the first-half portion of the channel length where carbon oxidation and denitrification were predominant. The second-half portion where nitrification mainly occurred had much less biofilm accumulation and thickness.

scholarly journals A Study on Organic Carbon and Nitrogen Removal by Sulfate Reduction and Sulfur Denitrification Process.

1998 ◽  
Vol 27 (6) ◽  
pp. 432-439 ◽  
Author(s):  
Ryoko YAMAMOTO-IKEMOTO ◽  
Tomoaki KOMORI ◽  
Yasuyuki IDE ◽  
Kazuto KANAI
Keyword(s):  
Organic Carbon ◽  
Sulfate Reduction ◽  
Nitrogen Removal ◽  
Carbon And Nitrogen ◽  
Denitrification Process
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