Inter-relationships between nitrogen balance, pH and dissolved oxygen in an oxidation ditch treating farm animal waste

1975 ◽  
Vol 9 (1) ◽  
pp. 25-30 ◽  
Author(s):  
I. Murray ◽  
J.W. Parsons ◽  
K. Robinson
Keyword(s):  
Dissolved Oxygen ◽  
Nitrogen Balance ◽  
Farm Animal ◽  
Animal Waste ◽  
Oxidation Ditch

scholarly journals Study on Sludge and Dissolved Oxygen Distribution in a Full-Scale A2/O Oxidation Ditch

Water ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 2776
Author(s):  
Chengyi Li ◽  
Zhao Han ◽  
Yuquan Zhang ◽  
Yuan Zheng ◽  
Hepeng Zhang ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Flow Model ◽  
Rotation Speed ◽  
Full Scale ◽  
Oxidation Ditch ◽  
Bed Height ◽  
Consumption Rates ◽  
The Relationship ◽  
Oxygenation Rate ◽  
Biological Selection

The distribution of velocity, sludge, and dissolved oxygen in a full-scale anaerobic-anoxic-oxic (A2/O) oxidation ditch was numerically simulated under three rotation speed scenarios. The viscosity and settling rate of activated sludge were defined through a user-defined function (UDF), and the sludge phase was calculated using the mixture multiphase flow model. Dissolved oxygen (DO) was set as a user-defined source (UDS) and its generation and consumption rates were defined with UDFs. The relationship between velocity and sludge concentration was found to be contradictory, with dead zones leading to large sludge concentrations at the bottom of the oxidation ditch (OD), but not at the middle-curved wall of the anoxic pool. The flow rate of the reflux slot and aerator oxygenation rate were checked and correlated with DO concentrations in the anaerobic pool. The majority of the large sludge concentrations were concentrated in the biological selection pool and these remained constant with bed height. With reduced propeller and agitator rotation speed, the sludge concentrations reduced in the biological selection pool, but increased in the anaerobic and anoxic pools.

scholarly journals An Economic Evaluation of Selected Manure Disposal Systems

1972 ◽  
Vol 1 (01) ◽  
pp. 121-128
Author(s):  
Harold W. Gaede ◽  
Robert L. Christensen ◽  
Muhammad Ashraf
Keyword(s):  
Economic Evaluation ◽  
Waste Management ◽  
Environmental Pollution ◽  
Indirect Effects ◽  
Biological Characteristics ◽  
Farm Animal ◽  
Animal Waste

Environmental pollution is defined as “the unfavorable alteration of our surroundings through direct or indirect effects on the chemical, physical, and biological characteristics of our air, land, and water influenced primarily by man's actions. Some of the major variables, elements of the problem, and problems related to farm animal waste management can be found in Table 1.

scholarly journals Usage of Farm Animal Waste for Biogas Production

2017 ◽  
Vol 66 ◽  
pp. 012034
Author(s):  
O V Sankina ◽  
A P Chernysh ◽  
A S Sankin
Keyword(s):  
Biogas Production ◽  
Farm Animal ◽  
Animal Waste

The Operating Characteristics of Orbal Oxidation Ditch Process under Low Dissolved Oxygen

2013 ◽  
Vol 328 ◽  
pp. 297-303
Author(s):  
Si Mei Zhang ◽  
Lu Liu ◽  
Shu Heng Hu
Keyword(s):  
Dissolved Oxygen ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxidation Ditch ◽  
Operating Characteristics ◽  
Low Dissolved Oxygen ◽  
N Removal ◽  
Orbal Oxidation Ditch

Orbal oxidation ditch is widely used in urban sewage treatment system ,Oxygen consumption level is an important index to measure process operating characteristic, discuss the operation mode of Oxidation ditch under low dissolved oxygen concentration condition is the main link of Sewage plants energy saving operation. Through the adjustment of chongqing TongLiang sewage treatment plant Orbal oxidation ditch aerations equipment operation parameters, the operating power reduced 7.5 kW, the removal rate of TN increased from 19% to more than 50%,and COD, BOD5, TP, NH3 - N removal rate was not affected, the Water meet the design requirements.

Potential of biogas production from farm animal waste in Malaysia

2016 ◽  
Vol 60 ◽  
pp. 714-723 ◽  
Author(s):  
Peyman Abdeshahian ◽  
Jeng Shiun Lim ◽  
Wai Shin Ho ◽  
Haslenda Hashim ◽  
Chew Tin Lee
Keyword(s):  
Biogas Production ◽  
Farm Animal ◽  
Animal Waste

Process Design and Operational Modifications of Oxidation Ditches for Biological Nutrient Removal

1992 ◽  
Vol 25 (4-5) ◽  
pp. 249-256 ◽  
Author(s):  
D. Sen ◽  
C. W. Randall ◽  
T. J. Grizzard ◽  
D. R. Rumke
Keyword(s):  
Dissolved Oxygen ◽  
Temperature Sensitivity ◽  
Performance Testing ◽  
Sensitivity Coefficient ◽  
Cold Weather ◽  
Biological Nutrient Removal ◽  
Secondary Effluent ◽  
Oxidation Ditch ◽  
In Series ◽  
Influent Flow

An oxidation ditch system was modified for excess biological phosphorus and nitrogen removal by connecting two oxidation ditches in series with a small anaerobic cell (10 percent of total reactor volume). The process was operated with 40 to 50 percent of the influent flow entering the anaerobic cell. The rest of the influent was bypassed to the first oxidation ditch. The detention time in the anaerobic cell was adjusted as a process control parameter to develop low oxidation reduction potentials in cold weather or in situations where the influent flow entrained substantial quantities of dissolved oxygen. Average performance levels of 0.6 mg/L for total phosphorus and 4 mg/L for total nitrogen were achieved under temperate conditions. Secondary effluent alkalinity, turbidity and ortho-phosphorus measurements were used as alternative control parameters in addition to dissolved oxygen measurements in the oxidation ditch. Performance testing was carried out at a second oxidation ditch system to estimate the temperature sensitivity of nitrification. It was found that the temperature sensitivity coefficient was only 1.0661/Ceisius in the temperature range between 15 and 25 Celsius.

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