A SURFACE AERATION SYSTEM TO REDUCE VFA, BOD, AND SOLIDS IN MANURE STORED IN OPEN FACILITIES

2003 ◽  
Vol 19 (6) ◽  
pp. 717-723 ◽  
Author(s):  
Z. Zhang ◽  
J. Zhu
Keyword(s):  
Surface Aeration ◽  
Aeration System

Evaluation of a Field-Scale Surface Aeration System in an Anaerobic Poultry Lagoon

2010 ◽  
Vol 26 (2) ◽  
pp. 307-318 ◽  
Author(s):  
S. Mukhtar ◽  
M. S. Borhan ◽  
S. Rahman ◽  
J. Zhu
Keyword(s):  
Field Scale ◽  
Surface Aeration ◽  
Aeration System ◽  
Scale Surface

Diffused aeration systems from theory to design

1978 ◽  
Vol 5 (1) ◽  
pp. 32-41 ◽  
Author(s):  
Jatinder K. Bewtra ◽  
Donald S. Mavinic
Keyword(s):  
Oxygen Transfer ◽  
Climatic Conditions ◽  
Air Bubbles ◽  
Cold Regions ◽  
Surface Aeration ◽  
Conventional Activated Sludge ◽  
Aeration System ◽  
Tank Geometry ◽  
Counter Current ◽  
Mechanical Surface

Aeration has been used successfully in northern Canada and other cold regions for treating domestic and industrial waste waters by aerated lagoons, extended aeration package units and conventional activated sludge plants. Many of these installations used diffused aeration because this system has shown several advantages over mechanical surface aeration. The advantages of using diffused aeration in cold regions for oxygenation as well as for mixing are discussed in this paper.The parameters affecting the efficiency of oxygen transfer and the mixing of the tank contents are identified and the influence of varying these operating parameters on the performance of diffused aeration systems under cold climatic conditions is discussed. Equations showing the influence of temperature, airflow rates, submergence and tank geometry on the overall oxygen transfer coefficient are presented.A process of aeration, employing counter-current flow of air bubbles and waste water, is shown to result in increased contact time and therefore higher oxygenation efficiencies. A typical example for designing a diffused aeration system in cold regions has been worked out.

A Field-Scale Surface Aeration System to Reduce Odor Generation

2009 ◽  
Vol 52 (2) ◽  
pp. 615-620 ◽  
Author(s):  
C. Dong ◽  
J. Zhu ◽  
C. F. Miller
Keyword(s):  
Field Scale ◽  
Surface Aeration ◽  
Aeration System ◽  
Odor Generation ◽  
Scale Surface

Evaluation of a Low Cost Surface Aeration System in an Anaerobic Poultry Lagoon

2009 ◽  
Author(s):  
Saqib Mukhtar ◽  
M S Borhan ◽  
S Rahman ◽  
Jun Zhu
Keyword(s):  
Low Cost ◽  
Surface Aeration ◽  
Aeration System ◽  
Cost Surface

Optimisation of Aeration Efficiency: A Design Procedure for Secondary Treatment Using a Hybrid Aeration System

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1403-1419 ◽  
Author(s):  
V. K. Thomas ◽  
B. Chambers ◽  
W. Dunn
Keyword(s):  
Plug Flow ◽  
Design Procedure ◽  
Aeration Tank ◽  
Surface Aeration ◽  
Aeration System ◽  
Fine Bubble ◽  
Oxygen Transfer Efficiency ◽  
Aeration Efficiency ◽  
Attractive Option ◽  
Activated Sludge Systems

The fine-bubble diffused air (FBDA) system of aeration is most efficiently operated in low rate activated sludge systems. The aeration technique is, however, subject to poor oxygen transfer efficiency and diffuser clogging under increased loading conditions such as are experienced close to the tank inlet in plug-flow systems. Mechanical, surface aeration systems, though apparently less efficient, do not suffer from these disadvantages. The ideal aeration tank configuration, for optimum aeration efficiency is therefore:–inlet anoxic zone–completely mixed surface aerated zone–plug-flow, fine-bubble diffused air zone with tapered aeration–clarification tanks. An overall aeration efficiency of 1.5-2.0 kg/kwh is predicted for nitrifying systems, together with an increased diffuser lifetime compared to a conventional FBDA tank. The design procedure is illustrated using parameters for a large UK works. Despite greater civil costs, the reduced running costs and NPC of the hybrid system make it an attractive option when compared to a plug-flow FBDA system or a conventional surface aeration plant.

Data-Driven Dynamic Modeling and Control of a Surface Aeration System

2007 ◽  
Vol 46 (25) ◽  
pp. 8607-8613 ◽  
Author(s):  
Ankit B. Gandhi ◽  
Jyeshtharaj B. Joshi ◽  
Valadi K. Jayaraman ◽  
Bhaskar D. Kulkarni
Keyword(s):  
Dynamic Modeling ◽  
Data Driven ◽  
Modeling And Control ◽  
Surface Aeration ◽  
Aeration System ◽  
And Control

Energy savings potential of new aeration system: Full scale trials

2012 ◽  
Vol 7 (4) ◽  
Author(s):  
A. Lazić ◽  
V. Larsson ◽  
Å. Nordenborg
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Total Energy ◽  
Energy Savings ◽  
Treatment Plant ◽  
Full Scale ◽  
Total Energy Consumption ◽  
Aeration System ◽  
Fine Bubble ◽  
Aeration Control

The objective of this work is to decrease energy consumption of the aeration system at a mid-size conventional wastewater treatment plant in the south of Sweden where aeration consumes 44% of the total energy consumption of the plant. By designing an energy optimised aeration system (with aeration grids, blowers, controlling valves) and then operating it with a new aeration control system (dissolved oxygen cascade control and most open valve logic) one can save energy. The concept has been tested in full scale by comparing two treatment lines: a reference line (consisting of old fine bubble tube diffusers, old lobe blowers, simple DO control) with a test line (consisting of new Sanitaire Silver Series Low Pressure fine bubble diffusers, a new screw blower and the Flygt aeration control system). Energy savings with the new aeration system measured as Aeration Efficiency was 65%. Furthermore, 13% of the total energy consumption of the whole plant, or 21 000 €/year, could be saved when the tested line was operated with the new aeration system.

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