SU1291557A1 - Method of checking operation of primary vertical settling tank of waste water - Google Patents

Abstract

The invention relates to a method for controlling the operation of a vertical clarifier, can be used in water treatment and allows for improved control accuracy. The concentration of suspended solids in the inset sediment C is measured and in the clarified liquid C, the ratio is calculated, the concentration of suspended solids in the initial liquid C is measured, and the correction factor (C) is calculated. The efficiency of E is estimated by the product of calculated values of E. 1 il. (About 1C CD)

Description

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This invention relates to methods for controlling the operation of vertical sedimentation tanks and can be used in water treatment.

The aim of the invention is to improve the accuracy of control of the operation of the primary vertical clarifiers.

The drawing shows a device that implements the proposed method.

The installation implementing the method contains a primary vertical settling tank 1, equipped with a pipeline 2 of incoming wastewater, a pipeline 3 of discharged clarified water and a pipeline 4 of a discharge sediment, which are equipped with concentrators 5-7 of suspended substances, respectively, connected through integrators-averagers 8-10. with a unit 11 measuring the ratio of two signals, wherein the concentrator 5 is connected to the integrator 8 via a non-linear correction unit 12.

Into the sump 1, the wastewater flows through the pipeline with flow rate q and suspended matter concentration 1, where it is separated into sediment and taped water. Clarified water with suspended matter concentration C,

and q flow is discharged through the pipe.

the wire 3 to the biological treatment facilities, and the sediment with the concentration C and the flow rate q is discharged through the pipe 4 to further dehydration.

Concentrometers 6 and 7 measure the ESCs at the outlet of the sediment and clarified water. These signals are sent to block 11, which generates a signal proportional to the magnitude of the lightening effect, to the operator of the sewage treatment plant or computer to calculate the optimal control mode.

Since the efficiency of the sedimentation tank operation depends to some extent on the SSC in the original wastewater, in order to exclude its effect on the monitored indicator - the effect of clarification, block 12 generates a correction signal, depending on the SSC in the source wastewater. Since the signals of concentrator meters 5–7 are constantly changing and separated in time, they are fed to the If block through integrators-averagers 8–10, which give it simultaneously averaged signals of measured values.

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The type of function d f (C) implemented by block I2 is established experimentally. talno for each type of sump and type of wastewater.

Example. Primary vertical septic tanks are installed at the treatment plant.

In order to control the upholding processes, an experimental installation is used in which the control of the operation of the settling tank is carried out by the proposed method.

Photoelectric signaling devices are used as concentrators of 5-7 suspended solids, while the sensor of the indicator is mounted to determine C in the manure distributor installed in front of the settling tanks to determine C 1 in the settling zone of the settler at a depth of 0.5 m, to determine C2 in the sludge tank located in the immediate vicinity of the sump.

Signals from all of the detectors are sent to capacitive integrators 8-10 with memory. At the moment of sediment resetting, these signals arrive at block 11, made on the basis of a microprocessor and implementing multiplication operations (C C, j and dividing the resulting product by C. in the natural range, concentrations (10–20 g / l) are close to linear, with e 0.05.

At the output of the block 11 set showing the device - contact microammeter. At the initial moment of release, the sediment has a large IWC, and the device shows a high clarification effect.

In the process of sludge release, its concentration decreases to the minimum allowable, after which the contact group of the microammeter is triggered and a signal is given to close the settling valve and reset the readings of averaging integrators. The frequency of discharge of sediment is established by the command device,

This method of controlling the operation of the sump is more objective, because it allows to take into account all aspects of the operation of the sump (the combined coefficient

the correlation between the effect of clarification and controlled parameters is almost twice as high as with the known method of estimation - 0.78 and 0.41, respectively,

The control of the settling tank with the application of the proposed control method increases the efficiency of its operation, while significantly reducing the moisture content of the discharged sludge and the cost of its subsequent dewatering.

Claims (1)

Invention Formula The method of controlling the operation of the primary vertical settling tank of sewage by measuring the concentration of suspended solids in the initial wastewater and in the clarified water and determining the clarification effect by the ratio of the indicated concentrations, characterized in that, in order to improve the accuracy of control, additionally 1291557. four but the concentration of suspended solids in the sediment is measured by the ratio of suspended solids in the source water to determine the clarification ratio of the water in the sump, according to the ratio of suspended solids in the sediment to the concentration of suspended solids 5 in clarified water: ten E d-C, 1 where E is the coefficient of clarification; C, C, C, j are, respectively, the concentration of suspended substances in the initial wastewater, in the clarified water and in the sediment; оС - nonlinear coefficient, depending on the quantitative and qualitative composition of the components, it is found in the original wastewater and equals 0.02-0.12. 2A Compiled by R.Kleiman Editor N.Gunko Tekhred L.Oleinik Proofreader Shekmar Order 1169/27 Circulation 852Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4