Optimum operation of a small sequencing batch reactor for bod and nitrogen removal based on on-line our-calculation

1997 ◽  
Vol 35 (6) ◽  
pp. 29-36 ◽  
Author(s):  
N. H. Johansen ◽  
J. S. Andersen ◽  
J. la Cour Jansen
Keyword(s):  
Process Control ◽  
Sequencing Batch Reactor ◽  
Energy Savings ◽  
Batch Reactor ◽  
Waste Water Treatment ◽  
Utilization Rate ◽  
Oxygen Utilization ◽  
On Line ◽  
Line Process ◽  
Oxygen Utilization Rate

A full-scale Sequencing Batch Reactor designed for 200 P.E. has been operated with nutrient removal. In aerated periods of the operational cycle the Oxygen Utilization Rate has been calculated on-line based on a standard oxygen probe which is also used for the control of the oxygen supply. It is described how a simple OUR process control strategy can be applied in order to obtain energy savings and optimization of the plant capacity. OUR has been found to be very valuable for on-line and off-line process control at small nutrient removing waste water treatment plants. A true batch system as the SBR provides the optimum conditions for the installation of OUR process control, but it can also be applied in other alternating activated sludge plants.

Application of multiway ICA for on-line process monitoring of a sequencing batch reactor

2004 ◽  
Vol 38 (7) ◽  
pp. 1715-1732 ◽  
Author(s):  
Chang Kyoo Yoo ◽  
Dae Sung Lee ◽  
Peter.A. Vanrolleghem
Keyword(s):  
Process Monitoring ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
On Line ◽  
Line Process

scholarly journals Achieving Efficient and Stable Deammonification at LowTemperatures—Experimental and Modeling Studies

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3961
Author(s):  
Hussein Al-Hazmi ◽  
Xi Lu ◽  
Dominika Grubba ◽  
Joanna Majtacz ◽  
Przemysław Kowal ◽  
...  
Keyword(s):  
Sequencing Batch Reactor ◽  
Energy Savings ◽  
Batch Reactor ◽  
Phase Changes ◽  
Intermittent Aeration ◽  
Short Term ◽  
Higher Temperature ◽  
Effects Of Temperature ◽  
The Mathematical Model ◽  
Positive Effect

The short-term effects of temperature on deammonification sludge were evaluated in a laboratory-scale sequencing batch reactor (SBR). Mathematical modeling was used for further evaluations of different intermittent aeration strategies for achieving high and stable deammonification performance at decreasing temperatures. As for the biomass cultivated at high temperatures (e.g., 30 °C), a higher temperature dependency (the adjusted Arrhenius coefficient θ for 11–17 °C = 1.71 vs. θ for 17–30 °C = 1.12) on the specific anammox growth rates was found at lower temperatures (11–17 °C) in comparison with higher temperatures (17–30 °C). Further evaluations of recovering the nitrogen removal efficiency at decreasing temperatures with the mathematical model by modifying the intermittent aeration strategies (aeration frequency (F) and the ratio (R) between non-aerated (non-aer) phase and aerated (aer) phase durations) indicated that intermittent aeration with a prolonged non-aerated phase (e.g., R ≥ 4 regardless of F value) would help to maintain high and stable deammonification performance (~80%) at decreasing temperatures (14–22 °C). Extending the non-aerated phases (increasing R) and reducing the frequency (F) of off/on phase changes have a positive effect on increasing energy savings, leading to increasing interest in this method.

Diagnostic errors and repetitive sequential classifications in on-line process control by attributes

2010 ◽  
Vol 201 (1) ◽  
pp. 231-238 ◽  
Author(s):  
Roberto da Costa Quinino ◽  
Emerson C. Colin ◽  
Linda Lee Ho
Keyword(s):  
Process Control ◽  
Diagnostic Errors ◽  
On Line ◽  
Line Process

On-Line Process Control using Attributes with Misclassification Errors: An Economical Design for Short-Run Production

2012 ◽  
Vol 41 (10) ◽  
pp. 1813-1832 ◽  
Author(s):  
Lupércio F. Bessegato ◽  
Roberto C. Quinino ◽  
Luiz H. Duczmal ◽  
Linda Lee Ho
Keyword(s):  
Process Control ◽  
Economical Design ◽  
Misclassification Errors ◽  
Short Run ◽  
On Line ◽  
Line Process

Use pH and ORP as fuzzy control parameters of denitrification in SBR process

2002 ◽  
Vol 46 (4-5) ◽  
pp. 131-137 ◽  
Author(s):  
Y.Z. Peng ◽  
J.F. Gao ◽  
S.Y. Wang ◽  
M.H. Sui
Keyword(s):  
Fuzzy Control ◽  
Sequencing Batch Reactor ◽  
Fuzzy Controller ◽  
Batch Reactor ◽  
Limiting Factor ◽  
Control Parameters ◽  
Carbon Addition ◽  
Brewery Wastewater ◽  
Aeration Time ◽  
On Line

In order to achieve fuzzy control of denitrification in a Sequencing Batch Reactor (SBR) brewery wastewater was used as the substrate. The effects of brewery wastewater, sodium acetate, methanol and endogenous carbon source on the relationships between pH, ORP and denitrification were investigated. Also different quantities of brewery wastewater were examined. All the results indicated that the nitrate apex and nitrate knee occurred in the pH and ORP profiles at the end of denitrification. And when carbon was the limiting factor, through comparing the different increasing rate of pH whether the carbon was enough or not could be known, and when the carbon should be added again could be decided. On the basis of this, the fuzzy controller for denitrification in SBR was constructed, and the on-line fuzzy control experiments comparing three methods of carbon addition were carried out. The results showed that continuous carbon addition at a low rate might be the best method, it could not only give higher denitrification rate but also reduce the re-aeration time as much as possible. It appears promising to use pH and ORP as fuzzy control parameters to control the denitrification time and the addition of carbon.

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