Performance and nitrogen removal mechanism in a novel aerobic-microaerobic combined process treating manure-free piggery wastewater

2021 ◽  
pp. 126494
Author(s):  
Yajie Tian ◽  
Jianzheng Li ◽  
Yiyang Fan ◽  
Jiuling Li ◽  
Jia Meng
Keyword(s):  
Nitrogen Removal ◽  
Removal Mechanism ◽  
Piggery Wastewater ◽  
Combined Process

Nitrogen removal from wastewater treatment lagoons

1999 ◽  
Vol 39 (6) ◽  
pp. 191-198 ◽  
Author(s):  
Timothy J. Hurse ◽  
Michael A. Connor
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Ammonia Removal ◽  
Contour Plot ◽  
Removal Mechanism ◽  
Dissolved Oxygen Concentration ◽  
Physical Processes ◽  
Contour Plots ◽  
Removal Processes

In an attempt to gain a better understanding of ammonia and nitrogen removal processes in multi-pond wastewater treatment lagoons, an analysis was carried out of data obtained during regular monitoring of Lagoon 115E at the Western Treatment Plant in Melbourne. To do this, a contour plot approach was developed that enables the data to be displayed as a function of pond number and date. Superimposition of contour plots for different parameters enabled the dependence of ammonia and nitrogen removal rates on various lagoon characteristics to be readily assessed. The importance of nitrification as an ammonia removal mechanism was confirmed. Temperature, dissolved oxygen concentration and algal concentration all had a significant influence on whether or not sizeable nitrifier populations developed and persisted in lagoon waters. The analysis made it evident that a better understanding of microbial, chemical and physical processes in lagoons is needed before their nitrogen removal capabilities can be predicted with confidence.

Study on De-Nitrification of Improved Step-Feed Progress

2014 ◽  
Vol 703 ◽  
pp. 171-174
Author(s):  
Bing Wang ◽  
Yi Xiao ◽  
Shou Hui Tong ◽  
Lan Fang ◽  
Da Hai You ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Fluidized Bed ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Operating Conditions ◽  
Removal Mechanism ◽  
Aerobic Zone

Improved step-feed de-nitrification progress combined with biological fluidized bed was introduced in this study. The progress had good performance and capacity of de-nitrification and organic matter. The experiment result showed that the de-nitrification efficiency of the improved biological fluidized bed with step-feed process was higher than the fluidized bed A/O process under the same water quality and the operating conditions. When the influent proportion of each segment was equal, the system showed good nitrogen removal efficiency with the change of influent C/N ratio, HRT and sludge return ratio. The removal rate of TN reached up to 88.2%. It showed that the simultaneous nitrification and de-nitrification phenomenon happened in the aerobic zone. The nitrogen removal mechanism was also studied.

Effects of the combination of aeration and biofilm technology on transformation of nitrogen in black-odor river

2016 ◽  
Vol 74 (3) ◽  
pp. 655-662 ◽  
Author(s):  
Mei Pan ◽  
Jun Zhao ◽  
Shucong Zhen ◽  
Sheng Heng ◽  
Jie Wu
Keyword(s):  
Enzyme Activity ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
River Networks ◽  
Water Tank ◽  
Simulation Experiments ◽  
Overlying Water ◽  
Combined Process ◽  
Polluted Rivers ◽  
Laboratory Water

Excess nitrogen in urban river networks leading to eutrophication has become one of the most urgent environmental problems. Combinations of different aeration and biofilm techniques was designed to remove nitrogen from rivers. In laboratory water tank simulation experiments, we assessed the removal efficiency of nitrogen in both the overlying water and sediments by using the combination of the aeration and biofilm techniques, and then analyzed the transformation of nitrogen during the experiments. Aeration (especially sediment aeration) combined with the biofilms techniques was proved efficient in removing nitrogen from polluted rivers. Results indicated that the combination of sediment aeration and biofilms, with the highest nitrogen removal rate from the overlying water and sediments, was the most effective combined process, which especially inhibited the potential release of nitrogen from sediments by reducing the enzyme activity. It was found that the content of dissolved oxygen in water could be restored on the basis of the application of aeration techniques ahead, and the biofilm technique would be effective in purifying water in black-odor rivers.

Combined process of urea nitrogen removal in anaerobic Anammox co-culture reactor

2008 ◽  
Vol 99 (6) ◽  
pp. 1722-1728 ◽  
Author(s):  
Sitong Liu ◽  
Zheng Gong ◽  
Fenglin Yang ◽  
Hanmin Zhang ◽  
Lijun Shi ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Combined Process ◽  
Urea Nitrogen

Denitrification as a Nitrogen Removal Mechanism in a Vermont Peatland

2005 ◽  
Vol 34 (6) ◽  
pp. 2052-2061 ◽  
Author(s):  
Melissa J. Hayden ◽  
Donald S. Ross
Keyword(s):  
Nitrogen Removal ◽  
Removal Mechanism

Experimental validation of a simulation and design model for nitrogen removal in sequencing batch reactors

1997 ◽  
Vol 35 (1) ◽  
pp. 113-120 ◽  
Author(s):  
G. Andreottola ◽  
G. Bortone ◽  
A. Tilche
Keyword(s):  
Nitrogen Removal ◽  
Phase Distribution ◽  
Nitrogen Concentration ◽  
Design Procedure ◽  
Aerobic Condition ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Daily Cycle ◽  
Piggery Wastewater ◽  
Biological Nitrogen

The development and the sensitivity analysis of a dynamic SBR simulation model for biological nitrogen removal, based on the Activated Sludge Model N. 1, are presented. An experimental study for the calibration and validation of the model was carried out using a bench scale SBR. Piggery wastewater was used as feed. The operating daily cycle of the SBR reactor included three sub-cycles of 7.5 hours each, each one alternating anoxic and aerobic condition, while settling phase was carried out at the end of the three sub-cycles. A first enhancement of model N. 1 was performed splitting nitrification into the two sub-processes of nitriation and nitratation. A second enhancement of the model was obtained with the introduction of a switch function of nitratation kinetics. An algorithm for optimization of the cycle length and phase distribution in order to minimize effluent nitrogen concentration was developed. A design procedure of SBR systems is also described.

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