JP3565944B2 - Separated liquid monitoring device - Google Patents

Description

[0001]
[Industrial applications]
The present invention monitors the properties of a separated liquid obtained by operating a centrifugal dehydrator that separates raw sludge into a separated liquid and a dewatered cake, or a concentrator that separates raw liquid into a separated liquid and a concentrated liquid. The present invention relates to a separated liquid monitoring device for optimally controlling the amount of a separated liquid.
[0002]
[Prior art]
Conventionally, various technologies for sludge treatment have been provided by solid-liquid separation treatment employing a centrifugal dehydration method, and in order to promote the solid-liquid separation treatment, for example, an agent such as an inorganic flocculant and an amphoteric polymer is mixed with raw sludge. It is used by being mixed in.
[0003]
The properties of the separated liquid are measured by a turbidity meter (IR meter) installed soaked in the separated liquid in order to set the amount of mixing of these inorganic condensing agents and amphoteric polymers into the raw sludge to a predetermined value. The inflow of the drug was adjusted arbitrarily according to the measurement results.
[0004]
It is known that when the separation state is not good due to a change in sludge properties, bubbles generated in the separation liquid become black.
[0005]
[Problems to be solved by the invention]
In the conventional separation liquid monitoring device, the concentration of the separation liquid is not uniform due to the effects of bubbles and suspended solids (SS) in the separation liquid, and the effects of residual chemicals, and it is difficult to measure the properties of the separation liquid. Therefore, there was a problem that optimal control of chemical injection could not be performed, resulting in non-uniform sludge separation.
[0006]
In addition, since the properties of the separated liquid are directly measured by a turbidimeter immersed in the separated liquid, the turbidity meter is liable to be stained and needs to be cleaned, which is troublesome and costly.
[0007]
The present invention has been made in order to solve the above-mentioned problems, and in response to a change in sludge properties, the properties of the separated liquid are monitored without using a turbidity meter during solid-liquid separation of the raw sludge. It is an object of the present invention to obtain a separated liquid monitoring device capable of optimally controlling the amount of chemicals to be mixed into raw sludge and promoting solid-liquid separation.
[0008]
[Means for Solving the Problems]
A separation liquid monitoring device according to the present invention includes a rectification introduction unit that rectifies and introduces a separation liquid sent from a centrifugal dehydrator or a concentrator, and a first tank that is formed so that the separation liquid can be introduced from the rectification introduction unit. And a first measuring means disposed above the first tank for measuring properties of a floating substance or a separated liquid floating in the first tank, and communicating the separated liquid in the first tank with the first tank. It is provided with a second tank to be introduced, and second measuring means arranged above the second tank and measuring the properties of a floating substance or a separated liquid floating in the second tank.
[0009]
[Action]
The separated liquid monitoring device according to the present invention has the following operations. That is, the separated liquid sent from the centrifugal dehydrator or the concentrator is rectified by the rectification introducing means, and is introduced into the first tank. The properties of the floating material or the separated liquid that floated in the first tank are measured by the first measuring means. In addition, the floating material or the separated liquid overflowing the first tank is appropriately discharged.
[0010]
Next, the separated liquid in the first tank is introduced into the second tank, and the properties of the floating substance or the separated liquid that floated in the second tank are measured by the second measuring means. In addition, a floating substance or a separated liquid overflowing the second tank is also appropriately discharged.
[0011]
The amount of the chemical to be mixed into the raw sludge is optimally controlled according to the properties of the separated liquid and the like measured by the first measuring means and the second measuring means. In this case, since the first measuring means and the second measuring means are not installed soaked in the separation liquid, the properties of the separation liquid can be measured without being affected by dirt or the like.
[0012]
【Example】
Embodiment 1 FIG.
An embodiment of the present invention will be described below with reference to the drawings. First, an entire sludge treatment system using the separated liquid monitoring device according to the present embodiment will be described. FIG. 1 is a conceptual diagram showing a sludge treatment system in which a separated liquid monitoring device according to one embodiment of the present invention is used. In the figure, reference numeral 1 denotes a sludge tank in which raw sludge is stored; Is a pump that sends out the raw sludge to the outside through the pipe 3. Reference numeral 4 denotes a centrifugal dewatering machine that stores the raw sludge sent out by the pump 2 and separates and extracts a dewatered cake and a separated liquid of the raw sludge that has been dewatered by high-speed rotation centrifugation.
[0013]
Reference numeral 5 denotes an amphoteric polymer tank containing the amphoteric polymer, 6 a pump for sending the amphoteric polymer from the amphoteric polymer tank 5 to the pipe 3 and mixing it with the raw sludge, and 7 a control for controlling the amount of the amphoteric polymer sent. And is operable in accordance with the measurement result of a first optical sensor (first measuring means) 22 or a second optical sensor (second measuring means) 28 described later.
[0014]
Further, 8 is an inorganic coagulant tank containing an inorganic coagulant, 9 is a pump for sending the inorganic coagulant from the inorganic coagulant tank 8 to the pipe 3 and mixed with the raw sludge, and 10 is a supply of the inorganic coagulant. This is a controller that controls the amount, and is operably formed in accordance with the measurement result of the first optical sensor 22 or the second optical sensor 28 described later.
[0015]
Reference numeral 11 denotes a pipe for discharging the separated liquid discharged from the centrifugal dehydrator 4, and a bypass pipe 12 for bypassing a part of the separated liquid is connected. Reference numeral 15 denotes a separation liquid monitoring device that is provided in the middle of the bypass pipe 12 and controls the properties of the separation liquid in order to control the injection amount of a drug such as an amphoteric polymer. Reference numeral 16 denotes a pump provided in the middle of the bypass pipe 12 for sending the separated liquid in the bypass pipe 12 to the separated liquid monitoring device 15. Reference numeral 17 denotes a drainage passage for the dehydrated cake.
[0016]
Hereinafter, details of the separated liquid monitoring device 15 according to one embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a conceptual diagram of a separated liquid monitoring apparatus according to one embodiment of the present invention, FIG. 3 is a graph showing the relationship between the state of the separated liquid and the color sensor value, and FIG. FIG. 4 is a table showing the relationship of FIG. In the figure, reference numeral 18 denotes a rectifying and introducing means which is connected to the bypass pipe 12 and rectifies and introduces the separated liquid sent from the centrifugal dehydrator 4; This is a first tank formed so that the separated liquid passed through 18 can be introduced in a downward flow. That is, the first tank 20 is formed in a box shape with an upper part opened.
[0017]
Reference numeral 22 denotes a first optical sensor (first measuring means) such as a color sensor which is disposed above the first tank 20 and measures the properties (for example, the color of bubbles) of the floating material or the separated liquid floating in the first tank 20. ) So that the measured value data can be supplied to the controller 7 or the controller 10.
[0018]
Reference numeral 24 denotes a communication transfer means which communicates with the lower part of the first tank 20 to introduce and transfer the separated liquid in the first tank 20 to the second tank 26, and is in communication with the lower part of the second tank 26. Like the first tank 20, the second tank 26 is formed in a box shape with an opening at the top.
[0019]
Reference numeral 28 denotes a second optical sensor (second measuring means) such as a color sensor which is disposed above the second tank 26 and measures the properties (for example, the color of bubbles) of the floating material or the separated liquid floating in the second tank 26. ) So that the measured value data can be supplied to the controller 7 or the controller 10.
[0020]
A discharging means (not shown) is provided so that a floating substance or a separated liquid overflowing the first tank 20 and the second tank 26 is discharged to the pipe 11.
[0021]
Next, the operation will be described. The separated liquid discharged from the centrifugal dehydrator 4 is introduced into the rectification introduction means 18 via the pipe 11, the pump 16 and the bypass pipe 12, rectified and introduced into the first tank 20 as a downward flow. The properties (such as the color of bubbles) of the floating material or the separated liquid that floated in the first tank 20 are measured by the first optical sensor 22. The floating material or the separated liquid that has overflowed the first tank 20 is discharged to the pipe 11 by a discharge unit (not shown).
[0022]
Next, the separated liquid in the first tank 20 is introduced into the second tank 26 by the upward flow from the lower part of the second tank 26 via the communicating transfer means 24, and the floating material or the separated liquid that floats in the second tank 26 is The property is measured by the second optical sensor 28. The floating material or the separated liquid that has overflowed the second tank 26 is discharged to the pipe 11 by discharging means (not shown).
[0023]
The measurement value data measured by the first optical sensor 22 and the second optical sensor 28 is supplied to the controller 7 or the controller 10.
[0024]
The relationship between the measured value data and the properties of the separated liquid can be grasped, for example, as shown in FIGS. Therefore, by preliminarily examining the relationship between the measured value data and the properties of the separated liquid and the amount of the drug to be injected, the amount of the drug to be mixed into the raw sludge according to the properties of the separated liquid and the like is determined by the controller 7. , 10 are optimally controlled.
[0025]
Further, in this case, since the first optical sensor 22 and the second optical sensor 28 are not directly immersed in the separation liquid and are not installed, the properties of the separation liquid can be accurately measured without being affected by dirt or the like.
[0026]
In addition, since the properties of the separated liquid can be measured by the two first optical sensors 22 and the second optical sensor 28, the separated liquid is less susceptible to the effects of bubbles and suspended solids (SS) in the separated liquid and the effects of residual chemicals and the like.
[0027]
【The invention's effect】
As described above, according to the present invention, a rectifying and introducing means for rectifying and introducing a separated liquid sent from a centrifugal dehydrator or a concentrator, and a first rectifying and introducing means capable of introducing the separated liquid from the rectifying and introducing means. A tank, a first measuring means disposed above the first tank, for measuring properties of a floating substance or a separated liquid floated in the first tank, and a separated liquid in the first tank in communication with the first tank. And a second measuring means arranged above the second tank and measuring the properties of the floating material or the separated liquid floating in the second tank, so that the sludge property changes. Thus, it is possible to obtain a separated liquid monitoring device that can optimally control the amount of the chemical to be mixed into the raw sludge according to the above and promote the solid-liquid separation processing.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing a sludge treatment system in which a separated liquid monitoring device according to one embodiment of the present invention is used.
FIG. 2 is a conceptual diagram of a separated liquid monitoring device according to one embodiment of the present invention.
FIG. 3 is a graph showing a relationship between a state of a separated liquid and a color sensor value.
FIG. 4 is a table showing a relationship between a state of a separated liquid and a color sensor value.
[Explanation of symbols]
4 Centrifugal dehydrator 15 Separated liquid monitoring device 18 Rectification introducing means 20 First tank 22 First optical sensor (first measuring means)
26 second tank 28 second optical sensor (second measuring means)

Claims (1)

A chemical is mixed into the raw sludge and solid-liquid separation is performed to produce a separated liquid and a dewatered cake. Rectifying and introducing means, a first tank formed so as to be able to introduce the separation liquid from the rectifying and introducing means, and measuring properties of a floating substance or a separated liquid which is disposed above the first tank and floats in the first tank. A first measuring means, a second tank which communicates with the first tank and introduces the separated liquid in the first tank, and a floating substance or separation which is disposed above the second tank and floats in the second tank. A separated liquid monitoring device comprising: a second measuring means for measuring a property of the liquid.

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