On-Line runaway detection in batch reactors using chaos theory techniques

AIChE Journal ◽  
1999 ◽  
Vol 45 (11) ◽  
pp. 2429-2443 ◽  
Author(s):  
F. Strozzi ◽  
J. M. Zaldívar ◽  
A. E. Kronberg ◽  
K. R. Westerterp
Keyword(s):  
Chaos Theory ◽  
Batch Reactors ◽  
On Line

Rapid quantification of polyhydroxyalkanoates (PHA) concentration in activated sludge with the fluorescent dye Nile blue A

2011 ◽  
Vol 64 (3) ◽  
pp. 747-753 ◽  
Author(s):  
M. Oshiki ◽  
H. Satoh ◽  
T. Mino
Keyword(s):  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Nile Blue ◽  
Maximum Level ◽  
Fluorescence Measurement ◽  
Batch Reactors ◽  
Floc Size ◽  
Nile Blue A ◽  
On Line ◽  
Rapid Quantification

The present study was conducted (1) to develop a rapid quantification method of polyhydroxyalkanoates (PHA) concentration in activated sludge by Nile blue A staining and fluorescence measurement and (2) to perform on-line monitoring of PHA concentrations in activated sludge. Activated sludge samples collected from laboratory scale sequencing batch reactors and full-scale wastewater treatment plants were stained with Nile blue A and their fluorescence intensities were determined. There was a high correlation (R2 > 0.97) between the fluorescence intensities of Nile blue A and PHA concentrations in activated sludge determined by gas chromatography. The Nile blue A staining and fluorescence measurement method allows us to determine PHA concentrations in activated sludge within only five minutes and up to 96 samples can be measured at once by using microplate reader. On-line monitoring of PHA concentrations in activated sludge was achieved by using a fluorometer equipped with a flow cell and the time point at which PHA concentration in activated sludge reached the maximum level could be identified. In addition, we examined the influence of pH, floc size and co-existing chemicals in activated sludge suspension on the fluorescence intensities of Nile blue A.

Sequencing Batch Reactors - An Overview

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2523-2526 ◽  
Author(s):  
K. L. Norcross
Keyword(s):  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Process Selection ◽  
Wastewater Treatment Process ◽  
Industrial Sites ◽  
Pharmaceutical Manufacturers ◽  
Start Up ◽  
On Line ◽  
Oxygen Requirements ◽  
And Control

Sequencing Batch Reactors (SBR's) offer many advantages and few disadvantages to the wastewater treatment process selection. Due to the relatively recent surge of interest in SBR's, few plants have been on-line long enough for Engineers to have developed a thorough understanding of all design aspects and considerations. The author has been involved directly in the design, equipment supply, start-up and operation of almost 60 SBR's of all sizes. About two thirds of the installations are municipal and one-third of these installations are industrial sites involving wastes from food processors, dairies, distilleries, petro-chemical manufacturers, landfill leachate, tanneries, Government munition plants and pharmaceutical manufacturers. The control of filamentous bulking has also been excellent with SBR's. This paper will consider the mechanical, process and control aspects for design of an SBR. The mechanical aspects will include HRT and basin sizing, selection of aeration equipment and effluent decanters. The process parameters discussed will include loading rates and F:M considerations, MLSS concentration, oxygen requirements and D.O. uptake rate, flow proportional aeration, the benefits of an anoxic fill cycle, and finally, nutrient removal. Control considerations are briefly discussed.

On line procedures for supervising the operation of batch reactors

1988 ◽  
Vol 12 (5) ◽  
pp. 371-376 ◽  
Author(s):  
Dominique Bonvin ◽  
Urs Saner
Keyword(s):  
Batch Reactors ◽  
On Line

On-line optimization of batch reactors with two manipulated inputs

1996 ◽  
Vol 20 ◽  
pp. S1023-S1028 ◽  
Author(s):  
A.K.M.S. Rahman ◽  
Srinivas Palanki
Keyword(s):  
Batch Reactors ◽  
On Line

Scenario-integrated on-line optimisation of batch reactors

2003 ◽  
Vol 13 (8) ◽  
pp. 703-715 ◽  
Author(s):  
O. Abel ◽  
W. Marquardt
Keyword(s):  
Batch Reactors ◽  
On Line

On-line titrimetric monitoring of anaerobic–anoxic EBPR processes

2008 ◽  
Vol 57 (8) ◽  
pp. 1149-1154 ◽  
Author(s):  
M. Vargas ◽  
A. Guisasola ◽  
J. Lafuente ◽  
C. Casas ◽  
J. A. Baeza
Keyword(s):  
Control Strategies ◽  
Low Frequency ◽  
Phosphorus Release ◽  
Indirect Measurement ◽  
Carbon Substrate ◽  
Batch Reactors ◽  
Data Sampling ◽  
Nitrogen And Phosphorus ◽  
Nitrite Uptake ◽  
On Line

Denitrifying phosphorus accumulating organisms (DPAO) are able to remove nitrogen and phosphorus simultaneously. The use of DPAO in EBPR systems results in a substantial saving on aeration cost and a lower sludge production when compared to anaerobic–aerobic EBPR systems. This process is usually studied in sequencing batch reactors (SBR) and monitored with off-line measurements. However, off-line monitoring implies low frequency data sampling and delay between sampling and obtainment of the results. For this reason, an online measurement such as titrimetry is strongly recommended to improve the daily management of the lab-scale SBR. This paper shows different applications of titrimetric measurements for on-line monitoring of DPAO lab-scale SBR cycles. The results demonstrate that titrimetry is a suitable tool for detecting the end of phosphorus release and carbon substrate depletion point in the anaerobic phase. Moreover, this paper proposes the indirect measurement of nitrate/nitrite uptake rate with titrimetric measurements, which allows the on-line estimation of its concentration during the anoxic phase. Therefore, titrimetry is an on-line measurement with a high potential to implement new control strategies in DPAO lab-scale SBR systems.

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