SU1458324A1 - Method of controlling the process of biological treating ow waste water - Google Patents

Abstract

The invention relates to the automatic control of the processes of biological treatment of wastewater in air ducts and makes it possible to improve the quality of treatment due to precision and speed of control. The control method consists in sequential treatment of waste water in the averager, aeration tank and septic tank, stabilizing the load on the active sludge by changing the supply of water to and from the reserve tank, depending on the concentration of contaminants at its inlet and outlet, in the averager or in reserve capacity; in determining the predicted values of the concentration of contaminants at the entrance to the aeration tank and at the exit from the settling tank, comparing them with the set and obtained difference of correction values of water flow to the reserve capacity with leTOM corrections for the actual value of concentrations. 1 il. a (/) C

Description

The invention relates to the automatic management of biological wastewater treatment in aeration tanks and can be used to control the biological treatment of industrial wastewater, for example, in chemical industry.

The aim of the invention is to increase the quality of cleaning by increasing the accuracy and speed of control.

The drawing is a diagram of the control method.

The effluent water is fed to the averager 1 and through the regulator 2 to the reserve tank 3, from which water

The regulator 4 enters the averager 1 through the regulator. Then the wastewater is supplied to the aeration tank 5, and from it to the settling tank 6. The impulses of change in the concentration of contaminants in the wastewater and their duration are determined by measuring concentration meters 7-10. The pulses of change in the wastewater flow rate and their duration are determined by measuring flow meters 11-14. The water level in the reserve tank 3 is determined by a level gauge 15. Signals from meters 7-G5 are sent to a computing device 16, which sends signals to the command device 17. Co

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Mandrel device 17 sends signals to the executive mechanisms of regulatory bodies 2 and 4.

The method is carried out as follows.

Information about the state of the controlled object and the characterization of waste water with the help of meters 7,8,11 - I 5 is fed to computing device 16. Computing device 16 is based on mathematical models of a deterministic process of changing the pulse concentration of contaminants and waste water flow 3 and in the average 1, models

low concentration at the output of the averager 1 after the termination of the pulse (In this case, it determines the change in the position of the control

 Organs 2 and 4 will not be indicators of meters 7 and 11 at the water inlet to the installation, but a temporary function of the response to the impulse of changing the characteristics of water tics entering the reserve capacity 3 and the averager 1, the predicted duration and magnitude of the decrease in the concentration of contaminants. stationary nagT5 ruzki on activated sludge, high and stable quality of purified water :.

Prediction allows to take into account the dynamic characteristics of reserve capacity 3 and average 1.

of the stochastic process of formation and discharge of sewage from the source to the installation, it predicts for the period t of time the subsequent maths of obtaining information, a concentrated model of the deterministic process

averaging, pulsing the pulse, changing the characteristics of the wastewater over time, a water level meter 15 in the reserve tank 3, Here

The contamination of wastewater at the inlet to the aeration tank 5, the concentration of contaminants in the purified water at the outlet of the septic tank 6. At a time t from the beginning of the information, the actual concentration of the contaminants of the wastewater is measured with gauges 9 and 10 and the signals are sent to the computational device 16. When calculating the actual value of the K concentration of wastewater pollution and the predicted computing device 16 using the command device 17 and the actuators, it amends the position of the control rganov 2 and 4,

The use of prediction in the search for the direction and magnitude of the control to its effect allows us to estimate the temporal factor of the wastewater input to the installation-impulse change in the characteristics of the wastewater. At the same time, the duration of the pulse and its magnitude are essential in generating a signal to act on the regulated organs 2 and 4. With a short pulse, even if it is significant, the prediction will allow g to correctly assess the need to change the position of the controlling organs 2 and 4, to avoid filling the reserve water with the untreated water 3, unreasonably reducing the load on the activated sludge in the gg aeration tank 5, reducing the quality of the purified water. With a long pulse, the prediction will be able to estimate the time to keep high or

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The possibility and duration of changes in the concentration of pollutants at the outlet of the reserve tank 3 and the average 1 are taken into account; according to the meter} 5 - the possibility of additional reception for accumulation of concentrated wastewater or the possibility of discharge of the concentrated wastewater accumulated in the reserve tank 3 to the treatment. It also allows you to maintain a stationary load on the activated sludge, provides a high

quality of purified water

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Predicting, with the help of a mathematical model of the stochastic process of formation of a sewage flow at the inlet of an installation, allows, based on the signals from meters 7 and 11, to determine the expected characteristic of the subsequent impulse of sewage.

The adjustment introduced into the control of the position of regulatory bodies 2 and 4 according to the actual concentration of contaminants at the entrance to the aeration tank and at the outlet of the settling tank (measured by bodies 9 and 10) allows to take into account other factors of the biological treatment process that cannot be established by the forecast; mi 7, 8, 11 - 15.

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low concentration at the output of the averager 1 after the termination of the pulse (In this case, it determines the change in the position of the control

 Organs 2 and 4 will not be indicators of meters 7 and 11 at the water inlet to the installation, but a temporary function of the response to the impulse of changing the characteristics of water tics entering the reserve capacity 3 and the averager 1, the predicted duration and magnitude of the decrease in the concentration of contaminants. stationary nagT5 ruzki on activated sludge, high and stable quality of purified water :.

Prediction allows to take into account the dynamic characteristics of reserve capacity 3 and average 1.

- 2 This uses mathematical models of a deterministic process.

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The possibility and duration of the change in the concentration of contaminants at the outlet of the reserve tank 3 and the averager 1 are taken into account; according to the meter} 5, the possibility of additional reception for the accumulation of concentrated wastewater or the possibility of discharging the concentrated wastewater accumulated earlier in the reserve tank 3. It also allows you to maintain a stationary load on the activated sludge, provides a high

quality of purified water

I

Predicting, with the help of a mathematical model of the stochastic process of formation of a sewage flow at the entrance to the installation, allows to establish the estimated characteristic of the subsequent impulse of sewage based on signals from meters 7 and 11 in terms of the magnitude and duration of the current pulse tK.

The adjustment introduced into the control of the position of regulatory bodies 2 and 4 according to the actual concentration of contaminants at the entrance to the aeration tank and at the outlet of the settling tank (measured by meters 9 and 10) allows to take into account other factors of the biological treatment process that cannot be established by the forecast, by measuring 7, 8, 11 - 15.

Claims (1)

Invention Formula The method of controlling the process of jiological sewage treatment successively in the averager, the aeration tank and the septic tank by stabilizing the load on the activated sludge, changing the water supply to and from the reserve tank depending on the concentration of contaminants at its inlet and outlet and on the flow rate installation, in averager or in reserve ten In order to increase the quality of cleaning by increasing the accuracy and efficiency of control, the predicted values of the concentration of contaminants at the inlet of the agro tank and at the outlet of the settler are additionally determined, and the flow rate is adjusted by the difference of these values. water into and out of the reserve tank, taking into account the correction for the actual concentration value.