MODELLING AND CONTROL OF ACTIV ATED SLUDGE PLANTS ON THE BASIS OF RESPIROMETRY

1994 ◽  
Vol 30 (4) ◽  
pp. 265-274 ◽  
Author(s):  
H. Brouwer ◽  
A. Klapwijk ◽  
K. J. Keesman
Keyword(s):  
Control System ◽  
Activated Sludge ◽  
Respiration Rate ◽  
Flow Rate ◽  
Energy Cost ◽  
Cost Savings ◽  
On Line ◽  
And Control

In this paper. development of a cODlIol system for the activated sludge plant of Quest International Naarden BV is presented. The control system is based on on-line measurements of the actual respiration rate in the carrousel. From model sim ulations we conclude that overloading can be prevented by manipulating the wastewater flow rate. Energy can be saved. A day/night control of the aerators will result in energy cost savings between 11 and 21 %.

System Identification and Control of the Activated Sludge Process by Use of a Statistical Model

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1161-1172 ◽  
Author(s):  
M. Hiraoka ◽  
K. Tsumura
Keyword(s):  
Control System ◽  
System Identification ◽  
Statistical Model ◽  
Activated Sludge ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Ar Model ◽  
Diurnal Changes ◽  
Activated Sludge Process ◽  
And Control

The authors have been developing a hierarchical control system for the activated sludge process which consists of an upper level system controlling long-term seasonal variations, a control system of intermediate level aiming at optimization of the process and a control system of lower level controlling diurnal changes or hourly fluctuations. The control system using the multi-variable statistical model is one of the most appropriate control systems based on the modern control theory, for applying the lower level control of the activated sludge process. This paper introduces our efforts for developing the reliable data acquisition system, the control experiments applying the AR-model, one of the statistical models which were conducted at a pilot plant and present studies on the system identification and control at a field sewage treatment plant.

Validation of On-line Respiration Meter and its Applications by Computer Simulation

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1355-1363 ◽  
Author(s):  
C-W. Kim ◽  
H. Spanjers ◽  
A. Klapwijk
Keyword(s):  
Steady State ◽  
Activated Sludge ◽  
Respiration Rate ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Mass Balances ◽  
Short Term ◽  
Respiration Rates ◽  
On Line ◽  
Made In

An on-line respiration meter is presented to monitor three types of respiration rates of activated sludge and to calculate effluent and influent short term biochemical oxygen demand (BODst) in the continuous activated sludge process. This work is to verify if the calculated BODst is reliable and the assumptions made in the course of developing the proposed procedure were acceptable. A mathematical model and a dynamic simulation program are written for an activated sludge model plant along with the respiration meter based on mass balances of BODst and DO. The simulation results show that the three types of respiration rate reach steady state within 15 minutes under reasonable operating conditions. As long as the respiration rate reaches steady state the proposed procedure calculates the respiration rate that is equal to the simulated. Under constant and dynamic BODst loading, the proposed procedure is capable of calculating the effluent and influent BODst with reasonable accuracy.

Control of Activated Sludge Plants Based on Measurement of Respiration Rates

1993 ◽  
Vol 28 (11-12) ◽  
pp. 369-376 ◽  
Author(s):  
Abraham Klapwijk ◽  
Henri Spanjers ◽  
Hardy Temmink
Keyword(s):  
Activated Sludge ◽  
Respiration Rate ◽  
Flow Rate ◽  
Control Strategy ◽  
Rate Control ◽  
Level Control ◽  
Fixed Position ◽  
Integral Control ◽  
The Third ◽  
Respiration Rates

An integral control strategy for activated sludge plants presented in this paper consists of three low-level control tasks. The first is the actual respiration rate control by manipulating the influent flow rate, whereby the aerators are at a fixed position for each setpoint. The second task is the maximum respiration rate control by manipulating the waste activated sludge flow rate. The third task of the integral control strategy is the instantaneous respiration rate monitoring, which informs the operator about the performance of the process.

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.

Sign in / Sign up

Export Citation Format

Share Document