FI71496B - ANORDING FOR AUTOMATIC INSTALLATION WITH FRAME RELEASE - Google Patents

Description

1 71496

Device for the automatic adjustment of sludge removal from a sewer

The present invention relates to an apparatus for automatically controlling the removal of sludge from a sewer, the apparatus comprising a water flow rate sensor in the sewer inlet line, a sludge density meter and a valve mounted on the sludge outlet line, a valve position change mechanism, a pump position change mechanism, a pump which generates a valve opening and closing signal.

The automatic removal of sludge from a manhole is the most important problem in the automatic operation of manholes. Sludge can be removed from vertical and horizontal wells as well as biocoag-15 setters by gravity by spraying it under the hydrostatic pressure of the sludge liquid. In these cases, it is recommended to use a shut-off flap to regulate the removal of sludge according to its humidity and amount for automatic monitoring of wells 20. At present, however, automatic sludge removal is only possible based on either time or sludge level, as no instrument is currently available to measure sludge moisture. To accomplish this, sludge accumulation and removal from the septic tank should be known, which is determined experimentally, or should be a reliable sludge level gauge.

When removing sludge from dirt wells with pumps, automatic operation of the ditch well is possible by automatically starting and stopping the pump and adjusting 30 shut-off valves. For this purpose, the expected time for pump operation during the first phase of well operation, when automatic operation is not yet in use, should be determined experimentally. In both the first and second types of automation, local monitoring, remote monitoring or automatic monitoring can be used. The most preferred automatic monitoring of wells is one that uses local monitoring.

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The simplest solution to the problem of automatic sludge removal from septic tanks is to remove sludge according to a predetermined schedule program using a program controller (see Popkovitch GS, "Basic 5 of Automatic Control Equipment and Automation for Water Supply and Sewer Systems", Moscow, Visshaja Shkola, 1975, p. 298 ... 299).

However, some of the decanted water can be transferred to the tanks along with the sludge because no instrument is available to check the moisture of the sludge. In addition, it is difficult to arrange a precise program for pumping under varying conditions in the wastewater feed and varying amounts of suspended particles in the slurry. Also known is an apparatus 15 for automatically monitoring the removal of sludge from a septic tank, the apparatus comprising sensors for detecting maximum and minimum levels of sludge (see Popkovitch, GS, "Basics of Automatic Control Equipment and Automation for Water Supply and Sewer Systems", Moscow, 20). Visshaja Shkola ", 1975, p. 299). This equipment uses photoelectric sludge surface sensors. Each sensor includes a photoresistor and a lamp, both enclosed in metal housings. The current supplied from the sensor to the automatic monitoring circuit varies according to the optical density of the liquid substance located between the photoresistor and the lamp. Thus, the equipment measures the sludge levels at two preset levels. If the maximum sludge level is exceeded, the sludge pumping system is started and when the minimum sludge level is reached, the sludge pumping system is stopped.

The latter hardware is improved over those previously described above. However, the equipment does not provide a high level of quality for wastewater treatment when its input varies.

35 A prototype of the present invention has been used for the automatic control of the removal of sludge from a septic tank according to Japanese Accepted Application No. 3,71496

No. 50-20, 384, Class 9IC9. The apparatus includes a water flow rate sensor in the manhole inlet pipe, water turbulence sensors in the inlet and outlet pipes, a valve mounted therein for removing sludge from the manhole, a mechanism for changing the valve position, a pump for pumping sludge out and a unit for generating valve opening and closing signals. .

In the above-mentioned apparatus, the time for starting and stopping the slurry pump-10 and for opening and closing the valve, i.e. the moments of starting and stopping the sludge pumping are determined by the turbulence of the water in the inlet and outlet pipes and the flow rate of the water in the inlet pipe. Thus, the apparatus determines the start time of the sludge pumping 15 and its duration according to the turbulence of the water fed into and out of the well.

However, it is known that the quality of well operation is determined by the concentration of suspended particles at the well outlet and this has no precise dependence on the turbulence of the effluent. As a result, it is very difficult to estimate the amount of sludge settled in the manhole and its settling time. For the same reason, the equipment depends on variations in water level in the manhole and the level of sludge. All of this results in not achieving efficient and high quality wastewater treatment.

It is a main object of the present invention to provide an apparatus for automatically monitoring the removal of sludge from a manhole so as to achieve higher capacity and better quality in wastewater treatment by increasing the reliability of data on the amount of sludge deposited in the manhole and its settling time.

This main object is achieved by a device according to the invention, characterized in that it further comprises 35 suspended particle concentration meters in the inlet pipeline, a water flow rate sensor in the sewer outlet pipeline and 4,71496 suspended particle concentration meters in the same pipeline, two reference units, two reference units, two reference generating a valve opening and closing signal comprising two multipliers, a subtraction circuit and an integrator having a control input 5, the inputs of the first multiplier being connected to a water flow rate sensor in the inlet pipeline and the inlet of the second inlet to the water flow rate sensor and to the suspended particle concentration meter in the same pipeline, respectively, the outputs of the multipliers are connected to the subtraction to the corresponding inputs of the circuit, the output of the subtraction circuit is connected via the integrator to the first input of the reference unit, the second input of the reference unit is connected to the setting unit and the output is connected to the input of the valve position change mechanism and to the pump, and -20 to the first input whose second input of the reference unit is connected to the second setting unit and whose output is connected to the control input of the integrator.

Thanks to the described structure, the equipment continuously monitors the water flow rate and the concentration of suspended particles in the inlet and outlet pipes and, as a result, determines exactly the time required for a predetermined amount of sludge to settle in the manhole. The equipment monitors the density of the sludge in the sludge discharge pipeline and determines the exact time to 30 to stop pumping the sludge. The equipment is not sensitive to fluctuations in the level of wastewater and entering the. All this improves the capacity and quality of wastewater treatment.

The invention will now be described in more detail with reference to a particular embodiment and with reference to the accompanying drawing, which shows a block diagram of the present invention.

II

5,71496 of an apparatus according to the invention for the automatic control of the removal of sludge from a manhole.

The drawing shows a manhole with an inlet pipeline 2 and an outlet pipe 3, a sludge collector 4 and 5, a sludge removal pipe 5. a sensor 8 and 10 suspended particle concentration meter 9 mounted in the outlet line 3. A valve 10 controlled by a valve position change mechanism 11 is mounted in a sludge removal pipe 5. The valve 10 is connected to a pump 12 having a mechanism for starting 15 and stopping it (not shown). A sludge density meter 13 for the pipeline 5 is mounted in front of the valve 10 in the pipeline. The apparatus further includes a unit 14 for generating opening and closing signals to the valve 10, a reference unit 15 and a reference unit 16, and setting units 20 and 18. The unit 14 for generating opening and closing signals to the valve 10 includes two multipliers 19 and 20, a subtraction circuit 21 and an integrator 22 is the control input.

The water flow rate sensor 6 and the suspended particle concentration meter 7 mounted in the inlet pipe 2 are connected to the respective inputs in the multiplier 19. The water flow rate sensor 8 and the suspended particle concentration meter 9 mounted in the outlet pipe 2 are -30 fox to the respective inputs in the multiplier 20. The outputs of the multipliers 19 and 20 are connected to the respective inputs in the subtraction circuit 21. The output of the subtraction circuit 21 is connected to the input of the integrator 22. The output of the integrator 22 is connected to the first input of the reference unit 35. The setting unit 17 is connected to the second input of the comparison unit 15, which is used to set the value of the reference signal. The output of the comparison unit 15 is

__ - TT

6 71496 is connected to an inlet in the valve positioning mechanism 11. The output of the mechanism 11 is connected to the valve 10. The output of the comparison unit 15 is also connected to the starting and stopping mechanism of the sludge pumping pump 12. The slurry density meter 13 in the pipeline 5 is connected to the first input in the reference unit 16. The second input of the comparison unit 16 is connected to the setting unit 18, where the value of the reference signal (reference signal) is set. The output 10 of the comparison unit 16 is connected to the control input of the integrator 22.

The apparatus of the present invention operates as follows. First, the desired values of the reference signals are set in the setting units 17 and 18. The value of the reference signal, which is first approximate relative to the volume of the collector 4 of the slurry 15, is set in the setting unit 17. Thus, the permitted amount of settled sludge is set. The value of the reference signal, which is proportional to the minimum density of the slurry in the pipeline 5, is set in the setting unit 18. The apparatus is then started. Sensors 6 20 and 8 measure the flow rate of water to the manhole 1 in the inlet pipeline 2 and the outlet pipeline 3, while the meters 7 and 9 measure the concentration of suspended particles in the same pipelines. Signals from the water flow sensor 6 and the suspended particle concentration meter 7 in the inlet pipe 2 are fed to the respective inputs in the multiplier 19. Signals from the water flow sensor 8 and the suspended particle concentration meter 9 in the outlet pipe 3 to the the output signals are applied to the respective inputs in the subtraction circuit 21. The resulting signal is applied from the output of the subtraction circuit 21 to the input of the integrator 22. Thus, the unit 14, which generates an opening and closing signal for the valve 35 10, performs a continuous counting of the volume of settled particles. The following formula is used in unit 14: 71496 7 * ο Γ (Q1c1 - q2c2) at, 5 0 where and are the flow rates in the inlet and outlet pipes,

C1 and C2 are the concentrations of suspended particles in the inlet and outlet pipelines.

The signal produced by the unit 14 is compared with the reference signal stored in the setting unit 17 by the comparison unit 15. As soon as the output signal of the unit 14 is higher than the reference signal, an error-15 signal appears at the output of the comparison unit 15, which is fed to the valve position change mechanism 11 and this mechanism the output signal of the reference unit 15 to the pump 12 and this initiates a signal from the slurry density meter 13 which is passed to the reference unit and which is compared to the reference signal stored in the setting unit 18. When the output signal of the slurry density meter 13 becomes lower than the reference signal, a signal appears at the output of the reference unit 16, which is applied to the control input 25 in the integrator 22, which results in its reset (emptying). As a result, the output signal of the reference unit 15 disappears and the mechanism 11 closes the valve 10. The loss of the output signal of the reference unit 15 simultaneously causes the pump 12 to stop. Operating cycle 30 is repeated.

Thus, an apparatus for automatically monitoring the removal of sludge from a well, which continuously monitors the water flow rate and suspended particle concentrations in inlet pipe 2 and outlet pipe 35 in line 3, determines exactly the time required for a certain amount of sludge to settle in sump 1 and start sludge pumping.

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The apparatus monitors the density of the sludge in the sludge discharge pipe 5 and determines exactly the right time to stop pumping the sludge. The equipment is not sensitive to variations in the level of wastewater entering the manhole and inlet 5.

Although a particular embodiment of the invention has been described and illustrated above, various modifications may be made to those skilled in the art, and it is not intended that the invention be limited to the disclosed embodiment or its details which may depart from the inventive idea defined in the appended claims.

The apparatus according to the invention differs in advantage from the previously known apparatus for the automatic control of the removal of sludge from October 15 and makes it possible to increase the capacity and quality in the treatment of waste water.

li

Claims (1)

Apparatus for the automatic control of sludge discharge from a sewer, the device comprising 5 water flow rate sensors in the inlet pipe (2) of the sewer (1), a sludge density meter (13) and a valve (10) mounted in the sludge outlet pipe (3) ), a valve positioning mechanism (11), a pump for pumping out the sludge and a unit for generating a valve opening and closing signal, characterized in that it further comprises a suspended particle concentration meter (7) in the inlet pipe (2), water a flow rate sensor (8) in the outlet pipe (3) of the manhole (1) and a meter (9) for the concentration of suspended particles 15 in the same pipe, two reference units (15 and 16) and two setting units (17 and 18), a unit (14) which develops a valve (10) opening and closing signal and comprising two multipliers (19 and 20), a subtraction circuit (21) and an integrator with a control input 20 ( 22), wherein the inputs of the first multiplier (19) are connected to the water flow rate sensor (6) in the inlet pipeline (2) and to the suspended particle concentration meter (7) in the same pipeline, respectively, the inputs of the second multiplier 25 (20) are connected in the outlet pipe (3). but to the water flow rate sensor (8) and the suspended particle concentration meter (9) in the same pipeline, respectively, the outputs of the multipliers (19 and 20) are connected to the respective inputs of the subtractor circuit (21), the output of the subtractor circuit via the integrator (22) ) to a first inlet, the second inlet of the reference unit is connected to the setting unit (17) and the outlet is connected to the inlet of the valve positioning mechanism 35 (li) and to the pump (12), and the output of the slurry density meter (13) is connected to the reference unit. (16) to the first input whose reference-y the second input of the unit is connected to the second setting unit (18) and the output of which is connected to the control input of the integrator (22). 11 71496 Automatic installation of slamavlägsning fran en avloppsbrunn, vilken anordning omfattar en hastighets-5 detector for wattenströmningen i avloppsbrunnens (1) inlopps- rörledning (2), en concentrationsmätare (13) for slammet ocv en en (10) i en avloppsrörledning (3) for slammet, en ändringsmekanism (11) för ventilens läge, en pump fpumpning av slammet och en enhet som 10 alstrar en olpnings- und stängningssignal fören, kännetecknad därav, att den vidare omfattar en concentrat for the suspension of the particulate matter (2), and the detector (8) for the wattage of the filter (1) and the concentration (9) and the concentration (9) of the suspension of the solid (16) 17 och 18), en enhet (14) som alstrar en öppnings- oc stängningssignal för valve (10) och som omfattar tvä multiplikätorer (19 20 och 20), en subtr actions (21) and integrator (22) in the case of multipliers, variables for multipliers (19) in the case of multiplier accounts (2) in the case of multipliers (6) in the case of multipliers and in the same way as in the case of 25 (7) for the suspension of multiplicators (20) for the purpose of multiplying the number of multipliers (3) for the multiplier (9) (19 och 20) utcängar är kopplade account substraktionskretsens (21) motsvarande ingängar, varvid substraktionskretsens utgäng är genom integratorn (22) kopplad account jämförelseenhetens (15) 35 första ingäng, varvid jämförelseenhetens andra ingäng är kopplad account inställnings the host hosts the mechanism (11) for