Feasibility of automatic chemicals dosage control – a full-scale evaluation

2002 ◽  
Vol 45 (4-5) ◽  
pp. 445-452 ◽  
Author(s):  
M. Devisscher ◽  
H. Bogaert ◽  
D. Bixio ◽  
J. Van de Velde ◽  
C. Thoeye
Keyword(s):  
Control System ◽  
Carbon Source ◽  
Automatic Control ◽  
Full Scale ◽  
Iron Chloride ◽  
Control Laws ◽  
Scale Evaluation ◽  
On Line ◽  
Cost Efficient ◽  
Activated Sludge Systems

This contribution discusses the feasibility of automatic control for chemicals dosing in activated sludge systems. The evaluation is made on the basis of a full-scale implementation at the Lommel WWTP (Belgium) of an on-line controlled dosage system for iron chloride and external carbon source. The control laws are very simple and allow intuitive adaptation by the plant operators. The control system results in a significant reduction of the chemicals dosage, better effluent results and a lower sludge production. The implementation is furthermore cost-efficient.

Measurement and Control of Moisture in Wheat

1970 ◽  
Vol 3 (11) ◽  
pp. T181-T187 ◽  
Author(s):  
M. Brain
Keyword(s):  
Control System ◽  
Moisture Content ◽  
Automatic Control ◽  
Automatic Control System ◽  
Microwave Technique ◽  
Line Measurement ◽  
On Line ◽  
And Control ◽  
Measurement And Control ◽  
Consequent Improvement

A microwave technique for the continuous on-line measurement of moisture content in wheat is described together with an automatic control system based on these measurements. The results from a prototype installation are given and the consequent improvement of flour parameters are discussed.

scholarly journals Synthesis of control laws of electromechanical systems under polynomial approximation of characteristics of nonlinear elements

2018 ◽  
Vol 161 ◽  
pp. 02006 ◽  
Author(s):  
Vladislav Shishlakov ◽  
Elizaveta Vataeva ◽  
Natalia Reshetnikova ◽  
Dmitriy Shishlakov
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Polynomial Approximation ◽  
Mathematical Apparatus ◽  
Galerkin’S Method ◽  
Nonlinear Characteristics ◽  
Electromechanical Systems ◽  
Control Laws ◽  
New Class

The paper presents the solution of the problem of synthesis of the laws of control of electromechanical automatic control system under polynomial approximation. As a mathematical apparatus of the decision the generalized Galerkin's method is applied. This method is extended to a new class of objects with nonlinear characteristics approximated polynomially.

Automatically Controlled Anti-Collision Manoeuvre and its Numerical Simulation with Disturbances

2013 ◽  
Vol 210 ◽  
pp. 156-165
Author(s):  
Jerzy Graffstein
Keyword(s):  
Numerical Simulation ◽  
Control System ◽  
Automatic Control ◽  
Numerical Simulations ◽  
Abrupt Change ◽  
State Variables ◽  
Control Laws ◽  
Analysis Of Results ◽  
System Robustness ◽  
And Control

The article presents the discussion focused on specific features of the problem of flying objects motion when performing an example of anti collision manoeuvre. To realise this task, the structure of automatic control system with appropriate control laws are proposed. The nature of discussed manoeuvre needs the appropriate numerical method for computing desired values of state variables for subsequent phases of objects motion. These values are obtained adequately for their roles in several phases of motion. Numerical simulations are completed for the aircraft performing the anti collision manoeuvre consisted in abrupt change of yaw. Objects behaviour was tested in case of motion affected by disturbances. The analysis of results obtained by numerical simulations makes possible conclusions on stability of objects motion and control system robustness to assumed kind and level of disturbances.

Hybrid Automatic Control System of the Cascade of Centrifugal Extractors

2015 ◽  
Vol 1084 ◽  
pp. 661-665
Author(s):  
Ekaterina P. Zelenetskaya ◽  
Alexey G. Goryunov
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Human Factor ◽  
Current System ◽  
Neuro Fuzzy ◽  
Advanced Control ◽  
On Line ◽  
Negative Impacts

The paper provides a control system of the cascade of centrifugal extractors. This system is based on a conventional PID controller with elements of neuro-fuzzy logic for on-line tuning system. Neural networks used with fuzzy logic in an automatic control system allowed minimizing the negative impacts of human factor on the purification processes of uranium concentrates. The current system ensures the advanced control of a cascade and stabilization of the uranium concentration at the permissible industrial levels.

Automatic control of external carbon source addition for nitrogen removal in sewage with low C/N ratios

2004 ◽  
Vol 49 (5-6) ◽  
pp. 245-249 ◽  
Author(s):  
H.U. Nam ◽  
Y.O. Kim ◽  
J.H. Lee ◽  
S.H. Hur ◽  
T.J. Park
Keyword(s):  
Control System ◽  
Carbon Source ◽  
Automatic Control ◽  
Automatic Control System ◽  
Nitrogen Removal ◽  
Cost Effective ◽  
Pilot Scale ◽  
External Carbon Source ◽  
Oxidation Reduction ◽  
Set Value

For cost-effective nitrogen removal from sewage with low C/N ratios, an automatic control system for the addition of external carbon based on oxidation-reduction potential (ORP) data in an anoxic reactor has been developed. In this study, it was carried out with a pilot-scale modified Bardenpho process. This consisted of anoxic1, aerobic1, anoxic2 and aerobic2 stages with an external recycle ratio of 150% (Q/Qinf), and a media packing ratio of 2.4%-2.9% (v/v) in the aerobic reactor. As a result of applying the automatic control system for the minimization of the external carbon source dosage, the dosage was decreased by about 20%. This estimate was based on ORP compared with a stable dosage of 75mg/L based on the C/NOx-N ratio of the anoxic influent. It was necessary that the ORP set-value be regulated from -120 mV to Ð80 mV because influent NH4+-N concentration varied from 12 to 15 mg/L due to rainfall. Correspondingly, the demanded dosages were decreased. Drift of the the real-time value in control system was more stable after changing the ORP set-value from -120 mV to -80 mV.

Biosensors for nitrogen control in wastewaters

1996 ◽  
Vol 34 (1-2) ◽  
pp. 213-220 ◽  
Author(s):  
A. G. Massone ◽  
K. Gernaey ◽  
H. Bogaert ◽  
A. Vanderhasselt ◽  
A. Rozzi ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Biological Activity ◽  
Carbon Source ◽  
Wastewater Treatment Plants ◽  
Nitrogen Control ◽  
Biomass Activity ◽  
On Line ◽  
Removal Processes ◽  
Nitrate And Nitrite ◽  
Activated Sludge Systems

The control of nitrogen removal processes in activated sludge systems requires not only on-line values of the parameters such as ammonium, nitrate and nitrite, but also an evaluation on the nitrifying and denitrifying biomass activity, influent toxicity and carbon source requirements for denitrification. This paper describes four different biosensors, two on denitrification and two on nitrification. They all measure the biological activity of the nitrifying or denitrifying bacteria. Three of them measure nitrogen and carbon species, the fourth biosensor measures influent toxicity. These instruments open new perspectives for efficient on-line monitoring of wastewater treatment plants.

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