JP4448263B2 - Sludge solubilizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sludge solubilization apparatus for solubilizing sludge so as to be easily decomposed by microorganisms.
[0002]
[Prior art]
Conventionally, a biological treatment method using activated sludge is known as a method for treating organic sewage such as sewage. In this biological treatment method, sewage is led to pretreatment facilities such as a sand basin and a first sedimentation basin, and sediments with a high specific gravity are deposited. To do.
[0003]
In this biological treatment method, surplus sludge is generated, so it is a problem how efficiently the sludge is processed at low cost. A sludge solubilizer is proposed as a means to treat this surplus sludge. Has been.
[0004]
The above-described sludge solubilizer can pump excess sludge stored in a storage tank to a reactor through a supply path with a high-pressure pump so that the sludge can be easily decomposed by microorganisms at high temperature and high pressure. Solubilized, and this processing solution is returned to the aeration tank for processing.
[0005]
[Problems to be solved by the invention]
However, in the conventional sludge solubilizer, excess sludge is solubilized at high temperature and high pressure, so if the high pressure pump is clogged and malfunctions, the reactor can maintain a high pressure state. However, there was a problem that a problem that excess sludge could not be solubilized occurred.
[0006]
For this reason, it is necessary to prevent clogging of the high-pressure pump and to grasp this situation and to take quick action even when the high-pressure pump is clogged.
[0007]
[Means for Solving the Problems]
The solubilization apparatus of the invention according to claim 1 is a state in which sludge stored in a storage tank is pumped to a reaction apparatus through a supply path by a high-pressure pump, and the sludge is easily decomposed by microorganisms at high temperature and high pressure in the reaction apparatus. In the sludge solubilization apparatus for solubilizing the sludge, the sludge is introduced into the storage tank in a state of being finely pulverized by a fine pulverization means, and is supplied to the high-pressure pump via a filter provided in the supply path. On the other hand, a flow meter is provided in the supply path on the discharge side of the high-pressure pump, and when the high-pressure pump is clogged, an alarm is issued based on detection of the flow meter.
[0008]
In the solubilization apparatus according to the second aspect of the present invention, two high-pressure pumps are arranged in parallel in the supply path.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
First, before explaining the sludge solubilizer of the present invention, the configuration of the entire treatment system using the solubilizer will be described.
[0011]
FIG. 1 shows a schematic configuration of the entire processing system.
[0012]
The treatment system treats sewage and sludge and comprises a biological treatment tank 1, a sedimentation tank 2, a concentrating device 3, and a solubilizing device 4 of the present invention.
[0013]
The biological treatment tank 1 decomposes sewage with microorganisms grown and held in the biological treatment tank 1, and sewage to be treated is introduced.
[0014]
The sedimentation tank 2 stores the sludge mixed solution treated in the biological treatment tank 1 and precipitates the sludge in the mixed liquid. Most of the sludge is returned to the biological treatment tank as shown by a broken line. The amount of microorganisms returned to 1 and contributing to sewage treatment is adjusted, and the remaining sludge is taken out as excess sludge. The supernatant water from which the sludge has been separated in the sedimentation tank 2 overflows as treated water and is discharged to the outside.
[0015]
The concentrating device 3 is for concentrating the surplus sludge to a predetermined concentration, and the concentrated surplus sludge is introduced into the solubilizer 4.
[0016]
The solubilizer 4 is for treating the surplus sludge that has been concentrated in the biological treatment tank 1 so that the microorganisms can be easily decomposed, and by treating the surplus sludge under a predetermined high temperature and high pressure, I try to liquefy. The specific configuration of the solubilizer 4 will be described later.
[0017]
Next, a process flow of the entire processing system configured as described above will be briefly described.
[0018]
First, sewage is introduced into the biological treatment tank 1, and organic matter in the sewage is decomposed by microorganisms in the biological treatment tank 1. Biologically treated sewage is led to the sedimentation tank 2 as a sludge mixed solution, and sludge is settled by gravity sedimentation, and the supernatant water overflows from the overflow weir as treated water and is disinfected and then discharged to the outside. .
[0019]
On the other hand, most of the precipitated sludge is returned to the biological treatment tank 1 as return sludge, thereby maintaining the sludge concentration in the biological treatment tank 1 within an appropriate range. In such biological treatment with activated sludge, the growth of microorganisms occurs with the decomposition of organic matter, so usually the amount of sludge corresponding to the amount of sludge generated is discharged as excess sludge, but here it is commensurate with the amount generated. A large amount of sludge is taken out as surplus sludge and solubilized by the solubilizer 4. At the time of solubilization, it is more efficient to treat sludge concentrated to a high concentration. Therefore, it is preferable that the sludge is concentrated to a predetermined appropriate concentration by the concentration device 3 and then led to the solubilization device 4.
[0020]
The excess sludge introduced into the solubilizer 4 is solubilized and liquefied by the solubilizer 4 under a predetermined temperature and pressure, and then returned to the biological treatment tank 1 again. Thus, since the surplus sludge is processed by the solubilizer 4 and converted into an organic substance that is easily biodegradable, it is returned to the biological treatment tank 1, so that the decomposition process is performed biologically efficiently.
[0021]
Then, the specific structure of the sludge solubilization apparatus of this invention which comprises a part of processing system mentioned above is demonstrated.
[0022]
FIG. 2 shows an outline of the configuration of the solubilizer of the present invention.
[0023]
In FIG. 2, 5 is a receiving tank for receiving the above-described surplus sludge, and the bottom side of the receiving tank 5 is connected to a grinding machine 8 as a fine grinding means through an introduction path 7 in which a pump 6 is interposed.
[0024]
The crusher 8 grinds surplus sludge sent from the receiving tank 5 more finely to a uniform size. The ground surplus sludge is introduced into the storage tank 9 from the discharge port 8a.
[0025]
The storage tank 9 temporarily stores the surplus sludge, and is provided with a stirrer 10 that stirs the stored surplus sludge. The stirrer 10 agitates the surplus sludge to prevent sedimentation at the bottom. The surplus sludge is in a homogeneous state.
[0026]
The storage tank 9 is communicated with the reaction device 12 through the supply path 11. The supply path 11 is branched into two branch supply paths 11a and 11b, and then merges again to communicate with the reaction device 12. The branch supply paths 11a and 11b are connected to the high-pressure pump 13a. 13b and flow meters 14a and 14b are interposed on the discharge side thereof.
[0027]
One of these high-pressure pumps 13a and 13b is selectively operated, and the excess sludge in the storage tank 9 is pumped to the reactor 12 by the operation of one high-pressure pump 13a or 13b.
[0028]
The flow meters 14a and 14b are for measuring the flow rate of excess sludge flowing through the branch supply paths 11a and 11b. The flow signals detected by the flow meters 14a and 14b are input to a control device (not shown). The control device determines that the high-pressure pumps 13a and 13b are malfunctioning when the surplus sludge flow rate is reduced to a predetermined value based on the flow rate signal, and outputs an operation signal to an alarm device (not shown) to issue an alarm.
[0029]
A filter 15 is interposed in the supply path 11 on the upstream side of the high-pressure pumps 13a and 13b. The filter 15 is for removing foreign matters and large particles in the excess sludge.
[0030]
The reactor 12 is for treating surplus sludge supplied from the storage tank 9 in a state in which microorganisms are easily decomposed in the biological treatment tank 1 described above, and the supply path 11 is connected to the introduction part 12a. At the same time, a discharge path 16 is connected to the discharge portion 12b. Further, the reactor 12 is provided with a heater 17 for heating the supplied surplus sludge. The surplus sludge pressure-feeding action by the high-pressure pumps 13a and 13b, the relief pressure of a relief valve 19 to be described later, and the heater By the heating action by 17, the excess sludge is liquefied at a high temperature and high pressure to treat the solids in a state in which microorganisms are easily decomposed.
[0031]
The discharge path 16 communicates with a recovery tank 18 and introduces the processing liquid discharged from the discharge portion of the reactor 12 into the recovery tank 18, and the processing liquid is transferred from the recovery tank 18 to the biological treatment tank 1 described above. throw into.
[0032]
A relief valve 19 is interposed in the discharge path 16. The relief valve 19 opens the discharge passage 16 when the pressure exceeds a preset pressure set in advance, and the treatment liquid is collected in the collection tank 18 by this opening.
[0033]
Next, the process of the excess sludge by the sludge solubilization apparatus comprised in this way is demonstrated.
[0034]
Excess sludge discharged from the settling tank 2 is first charged into the receiving tank 5, introduced from the receiving tank 5 into the grinding machine 8 through the introduction path 7 by the pump 6, and finely ground and finely pulverized by the grinding machine 8. And introduced into the storage tank 9. The storage tank 9 stores the finely pulverized surplus sludge by stirring with the stirrer 10 in a homogeneous state. The surplus sludge in the storage tank 9 is supplied by the operation of one high-pressure pump, for example, the high-pressure pump 13a. After removing foreign matter into the passage 11 with the suction filter 15, the pressure is fed to the reaction device 12.
[0035]
In the reactor 12, the surplus sludge fed under pressure is solubilized at a predetermined high temperature and high pressure, and the treatment liquid is discharged from the discharge unit 12 b as new surplus sludge is introduced into the reactor 12. When the pressure on the upstream side in the discharge path 16 becomes higher than the set pressure of the relief valve 19, the relief valve 19 is opened, and the treatment liquid is collected in the collection tank 18 by this opening.
[0036]
The treatment liquid that has been solubilized by the reactor 12 and converted into an organic substance that is readily biodegradable and collected in the collection tank 18 is returned to the biological treatment tank 1 again, and biologically efficiently decomposed. .
[0037]
Various combinations of solubilization temperature and pressure conditions are possible, but the temperature is preferably set in the range of, for example, 50 ° C to 300 ° C. Further, the pressure is set based on the relief pressure of the relief valve 19 in the configuration of the present example, and the influence on the running cost is not so large. Stable surplus without adversely affecting the treatment of sewage by setting the temperature and pressure conditions in consideration of the operating conditions such as the conditions of the treatment tank 1, the amount of sludge to be treated, the treatment time, and the economic efficiency Sludge solubilization treatment can be performed.
[0038]
Here, in the solubilization process in this solubilizer, surplus sludge is processed under high temperature and high pressure, so if the high pressure pump 13a is clogged and malfunctions, the reactor 12 cannot maintain the high pressure state. This causes a problem that the excess sludge cannot be solubilized.
[0039]
For this reason, in the solubilizer of the present invention, surplus sludge is finely pulverized by the grinder 8 and then sucked into the high-pressure pump 13a through the filter 15. Therefore, the excess sludge is sucked into the high-pressure pump 13a in a state of uniform fine particles and pumped, thereby preventing clogging of the high-pressure pump 13a.
[0040]
Further, if the high pressure pump 13a is clogged, the flow of excess sludge deteriorates, so the flow meter 14a detects this, and the control unit activates an alarm device based on this detection result to sound an alarm sound. . As a result, the operator can grasp this situation, switch to the operation of the high-pressure pump 13b, pump the excess sludge by the high-pressure pump 13b, and repair the clogged high-pressure pump 13a. The branch supply passages 11a and 11b are provided with a plurality of on-off valves (not shown) so that when one of the high pressure pumps is clogged, the other high pressure pump can be operated and the clogged high pressure pump can be repaired safely. It has been.
[0041]
Thereby, the pumping of the excess sludge to the reaction apparatus 12 can be performed continuously without interruption, and the solubilization treatment of the excess sludge can be performed smoothly.
[0042]
【The invention's effect】
As described above, according to the sludge solubilization apparatus of the present invention, the sludge is finely pulverized by the fine pulverization means, and further filtered and sucked by the high-pressure pump to prevent clogging of the high-pressure pump by the sludge. can do. Moreover, even if the high-pressure pump is clogged, it is possible to grasp this situation and promptly repair it by detecting the clogging with the flow meter and issuing an alarm.
[0043]
Also, by arranging two high-pressure pumps in parallel in the supply path, even if one of the high-pressure pumps is clogged, it is possible to switch to the other high-pressure pump to pump excess sludge, and surplus sludge to the reactor Therefore, the excess sludge can be smoothly solubilized.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of an entire treatment system for treating sewage and sludge.
FIG. 2 is a diagram showing a schematic configuration of a sludge solubilization apparatus according to the present invention.
[Explanation of symbols]
4 Solubilizer 8 Grinding machine (fine grinding means)
9 Reservation tank 11 Supply path 12 Reactor 13a, 13b High pressure pump 14a, 14b Flow meter 15 Filter

Claims (2)

In a sludge solubilization device that sends sludge stored in a storage tank to a reaction device through a supply path with a high-pressure pump, and solubilizes the sludge so as to be easily decomposed by microorganisms under high temperature and high pressure in the reaction device.
The sludge is introduced into the storage tank in a state of being finely pulverized by a fine pulverization means, and is sucked into the high-pressure pump through a filter provided in the supply path, while being supplied on the discharge side of the high-pressure pump. A sludge solubilization device, characterized in that a flow meter is provided in the passage, and a warning is issued based on detection of the flow meter when the high-pressure pump is clogged. The sludge solubilizer according to claim 1, wherein two high-pressure pumps are arranged in parallel in the supply path.

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