JP2005169310A - Septic tank and abnormality detector of blower device for septic tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide an abnormality detector for rapidly detecting the abnormality of a septic tank or a blower device for the septic tank. <P>SOLUTION: In blower device for the septic tank having a blower, an air diffuser for diffusing air in the sewage of the septic tank and air blow piping for guiding air to the air diffuser from the blower, the abnormality detector of the septic tank and the blower device for the septic tank is equipped with an atmospheric pressure sensor connected to the air blow piping and outputting an atmospheric pressure abnormal signal when the atmospheric pressure in air blow piping falls below a first atmospheric pressure, that is, the atmospheric pressure in the air blow piping in a case that normal discharge is performed in the septic tank or becomes higher than second atmospheric pressure, that is, the atmospheric pressure in the air blow piping at the time of normal discharge. By this constitution, the water leak of the septic tank or the air leak in the air blow piping is detected on the basis of the fall of atmospheric pressure and the closure of a discharge port or a discharge pipe and the clogging of the air diffuser is detected on the basis of a rise in atmospheric pressure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a septic tank and an abnormality detection device for a septic tank blower.

  A septic tank that purifies and discharges sewage / wastewater (hereinafter “sewage”) discharged from homes or offices by microorganisms and supplies air to the sewage in order to maintain the purification action by microorganisms. It has a septic tank blower. Therefore, when an abnormality occurs in the septic tank or the septic tank blower, the sewage purification function of the septic tank is lowered, and the discharged water in the septic tank is polluted to cause environmental pollution. In addition, if sewage leaks from the septic tank or overflows due to abnormal discharge, environmental pollution occurs in the vicinity of the septic tank.

  In order to prevent such environmental pollution, regular inspection (for example, every 3 months or 4 months) of the septic tank and the septic tank blower is performed by an operator. However, even if an abnormality is discovered in the inspection work at intervals of 3 months or 4 months, in most cases, the polluted effluent is already discharged from the septic tank, and it is possible to deal with it after the environmental pollution occurs. It will only be.

Therefore, as a system for quickly discovering abnormalities in the septic tank and the septic tank blower, the abnormality of the blower included in the septic tank blower is detected by the abnormal current of the blower, and the turbidity of the septic tank discharge water and sewage in the septic tank, PH There has been proposed a system for detecting a decrease or abnormality of the sewage purification function by constantly monitoring values, hydrogen ion concentrations, suspended solids concentrations, ultraviolet ray absorption, etc. (see, for example, Patent Document 1).
JP 9-75964 A

However, the above-described conventional abnormality detection system requires a large number of detectors that detect the abnormal current detector of the blower, the turbidity of discharged water, the PH value, the hydrogen ion concentration, the suspended matter concentration, and the ultraviolet absorbance. The cost of the system is inevitable.
In the conventional system, even if the current abnormality of the blower can be detected immediately, the air supply abnormality of the blower (for example, air leakage of the diaphragm blower) or the air leakage from the air supply pipe cannot be directly detected. For this reason, there is no choice but to know the air supply abnormality of the blower and the air leakage of the air supply piping from the turbidity change of the discharged water. That is, in comparison with the inspection work at intervals of three months or four months, it is possible to detect an air supply abnormality of the blower at an early stage, but it is still a reactive measure after environmental pollution occurs. The same applies to the clogging of the air diffuser. The clogging can only be known after the turbidity change of the discharged water or the like occurs due to the insufficient amount of air supplied into the septic tank due to the clogging.

Furthermore, in the conventional system, water leakage in the septic tank cannot be detected, and it is necessary to rely on inspection work by an operator. No blockage of the septic tank outlet or pipe can be found until sewage overflows the septic tank.
The present invention has been made to solve these problems. By detecting a change in air pressure in the air supply piping of the septic tank blower, an electrical abnormality of the blower, an abnormal air supply of the blower, and an air supply It is an object of the present invention to provide an inexpensive anomaly detection device for a septic tank and a septic tank blower that can quickly detect air leaks in piping, clogging of a diffuser, septic tank leakage, septic tank outlet and outlet pipe blockage. And

  In order to achieve the above object, an abnormality detection device for a septic tank and a septic tank blower according to the present invention includes a blower, a diffuser for diffusing air into sewage in the septic tank, and the blower in the diffuser. In a septic tank blower (hereinafter sometimes referred to as “blower”) having an air supply pipe that guides air supplied from the air supply pipe, the air pressure in the air supply pipe is connected to the air supply pipe. And a barometric pressure sensor that outputs a barometric pressure abnormality signal when the pressure is lower than the second atmospheric pressure or higher than the second atmospheric pressure.

  Here, when the septic tank normally discharges the effluent water, the air pressure (necessary for normally purifying the sewage) generated in the air supply pipe according to the water depth of the air diffuser (hereinafter referred to as “normal water depth”). The atmospheric pressure sensor can detect water leakage in the septic tank by making the first atmospheric pressure an atmospheric pressure at which a small amount of air is supplied (hereinafter referred to as “normal atmospheric pressure”). This is because the lowering of the water level in the septic tank caused by water leakage lowers the air pressure in the air supply pipe to a first atmospheric pressure or lower. In addition, the air pressure sensor is configured such that the air pressure in the air supply pipe is lowered to a first air pressure or lower, thereby causing air leakage in the air supply pipe due to a crack or the like, a decrease in the amount of air supplied due to abnormal air supply of the blower, or the electric power of the blower. It is possible to detect a decrease in the amount of air supply or a stoppage of air supply due to a mechanical failure.

  Next, by setting the atmospheric pressure higher than the normal atmospheric pressure as the second atmospheric pressure, the atmospheric pressure sensor can detect the blockage of the outlet and the outlet pipe and the clogging of the diffuser. This is because the clogging of the discharge port or the discharge pipe raises the water level in the septic tank and raises the air pressure in the air supply pipe, and clogging of the air diffuser also increases the air pressure in the air supply pipe.

  As described above, according to the abnormality detection device for the septic tank and the septic tank blower of the present invention, it is detected that the air pressure of the air supply pipe has decreased to the first atmospheric pressure or lower or has increased to the second atmospheric pressure or higher. With only the atmospheric pressure sensor, that is, at a very low price, electrical abnormality of the blower, abnormal air supply of the blower, air leakage of the air supply piping, clogging of the air diffuser, leakage of the septic tank, and the outlet of the septic tank or The blockage of the discharge pipe can be detected quickly, and the effect of making it possible to prevent pollution of the discharged water and environmental pollution around the septic tank in advance.

  Hereinafter, with reference to the drawings, an embodiment of an abnormality detection device for a septic tank and a septic tank blower according to the present invention will be described. Here, FIG. 1 is a diagram showing the septic tank 10, the blower 20, the abnormality detection device 30 and the alarm device 40 according to the present invention, and FIG. 2 is a diagram showing a schematic configuration of the abnormality detection device 30.

(Septic tank 10)
As shown in FIG. 1, the septic tank 10 buried in the ground 1 introduces sewage from an introduction pipe 11 and precipitates and separates solids contained in the sewage in a sedimentation separation tank (or anaerobic filter bed tank) (not shown). The sewage is guided to an aeration tank (or carrier fluid tank, the same applies hereinafter) 12 and the sewage is purified by microorganisms in the aeration tank 12. Furthermore, the septic tank 10 precipitates (or filters) the suspended matter in the sewage purified by the aeration tank 12 in a sedimentation tank (or a filtration tank, not shown) and then into a disinfection tank (not shown). The product is sterilized and discharged as clarified water to a discharge pipe 14 connected to the discharge port 13.

(Blower 20)
The blower 20 shown in FIG. 1 has a blower 21, a diffuser 22 that supplies air into the sewage in the aeration tank 12, and an air supply pipe 23 that guides air from the blower 21 to the diffuser 22. . The blower is a general term for an air pump such as a diaphragm blower.

(Abnormality detection device 30)
The abnormality detection device 30 shown in FIG. 2 has a first atmospheric pressure sensor 31 and a second atmospheric pressure sensor 32, and is connected to the air supply pipe 23 via a pipe 23a. The pipe 23a has branch pipes 23b and 23c. The first atmospheric pressure sensor 31 is connected to the branch pipe 23b, and the second atmospheric pressure sensor 32 is connected to the branch pipe 23c. The atmospheric pressure in the air supply pipe 23 can be detected.

  When the first atmospheric pressure sensor 31 detects that the inside of the air supply pipe 23 has become equal to or lower than the first atmospheric pressure, the switch S31 included in the atmospheric pressure sensor 31 is turned on (conductive state) and outputs a first atmospheric pressure abnormality signal. . When the second atmospheric pressure sensor 32 detects that the inside of the air supply pipe 23 has become equal to or higher than the second atmospheric pressure, the second atmospheric pressure sensor 32 turns on the switch S32 included in the atmospheric pressure sensor 32 and outputs a second atmospheric pressure abnormality signal. These switches S31 and S32 are connected in parallel and connected between the alarm output terminals 33 and 34 of the abnormality detection device 30.

  Therefore, when the inside of the air supply pipe 23 is higher than the first atmospheric pressure and lower than the second atmospheric pressure, the alarm output terminals 33 and 34 are opened (off). If the inside of the air supply pipe 23 becomes lower than the first atmospheric pressure or the inside of the air supply pipe 23 becomes higher than the second atmospheric pressure, the switch S31 or S32 is turned on. The terminals 33 and 34 are also turned on, and the abnormality detection device 30 outputs a first or second atmospheric pressure abnormality signal indicating that the atmospheric pressure in the air supply pipe 23 has become abnormal. As the first and second atmospheric pressure sensors, for example, E8EB-01C manufactured by OMRON Corporation can be used.

(Alarm device 40)
The alarm device 40 is a device that is connected to the abnormality detection device 30 and emits an alarm when the alarm output terminals 33 and 34 are turned on. When this alarm is issued, the owner or administrator of the septic tank 10 enters the septic tank or the like. It is possible to know that some abnormality has occurred, and it is possible to immediately request the inspection company to inspect the septic tank 10 and the blower 20. The alarm device 40 is inexpensive, for example, a buzzer or a blinking lamp, but may be a communication device that automatically and directly reports an abnormality to a septic tank inspector via a communication line.

(Normal water depth and normal pressure)
When the septic tank 10 shown in FIG. 1 is normally discharged (when there is no water leakage in the septic tank 10 and no suspended matter is accumulated in the outlet 13 or the outlet pipe 14), the inside of the aeration tank 12 It is assumed that the water diffuser 22 disposed has a water depth of 1.4 m, and the water depth inside the outlet pipe 14 (for example, an inner diameter of 100 mm) in the vicinity of the outlet 13 is, for example, 2 to 3 cm.

  Thus, the water depth of the air diffuser 22 when normal discharge is performed is set as the normal water depth of the septic tank 10, and the air amount necessary for normally purifying sewage at the normal water depth is supplied to the aeration tank 12. The atmospheric pressure in the air supply pipe 23 that can be supplied is set to a normal atmospheric pressure. Since the air blower 20 supplies air to the aeration tank 12 against the water pressure, the normal pressure is slightly higher than the water pressure at the normal water depth (1.4 m above). In the septic tank 10 and the air blower 20 shown in FIG. Assume kilopascals (kPa).

  As described above, in the septic tank 10 and the blower 20, normal water depth (1.4 m) and normal atmospheric pressure (17 kPa) are maintained, and sewage purification is performed normally. It is assumed that the distance from the water surface of the aeration tank 12 to the upper wall 15 of the septic tank 10 at a normal water depth is, for example, 30 to 40 cm.

(First atmospheric pressure and second atmospheric pressure)
By the way, when the water level in the aeration tank 12 decreases and the water depth of the air diffuser 22 decreases to 1.2 m, the air pressure in the air supply pipe 23 decreases to, for example, 15 kPa. This 15 kPa is set as the first atmospheric pressure. When the water level in the aeration tank 12 rises and the water depth of the air diffuser 22 reaches 1.6 m, the air pressure in the air supply pipe 23 becomes high, for example, 19 kPa. This 19 kPa is set as the second atmospheric pressure.

  Here, the water level in the aeration tank 12 that generates the second atmospheric pressure is such that the amount of sewage inflow from the introduction pipe 11 is temporarily in a state where there is no leakage in the septic tank 10 and the discharge from the discharge port 13 is normal. The water level is set higher than the water level in the aeration tank 12 in the case of increase.

(Detection of abnormalities in septic tanks, etc.)
The abnormality detection device 30 configured as described above detects an abnormality in the septic tank 10 and the blower 20 as follows.

(Leakage of septic tank)
When water leaks in the septic tank 10, the water level in the aeration tank 12 also decreases due to a drop in the water level in the septic tank 10, and when the water depth of the air diffuser 22 becomes shorter than 1.2 m before long, The first atmospheric pressure sensor 31 outputs a first atmospheric pressure abnormality signal. That is, the abnormality detection device 30 can detect a water leak in the septic tank 10 and operate the alarm device 40. Therefore, the owner of the septic tank 10 can quickly know that water leakage has occurred, and can immediately request repairs to an inspection company to minimize environmental pollution due to water leakage. In order to detect water leakage earlier, the difference between the normal pressure and the first pressure may be reduced. For example, the first atmospheric pressure is set to 16 kPa.

(Clogging of outlet and outlet pipe)
When suspended matter or the like accumulates at the discharge port 13 or the discharge pipe 14 of the septic tank 10, the amount of discharged water from the discharge port 13 decreases, so that the water level in the aeration tank 12 increases due to the rise in the water level in the septic tank 10. To do. For example, if the discharge port 13 or the discharge pipe 14 is not completely closed, the septic tank 10 continues to discharge, but if the amount of sewage flowing from the introduction pipe 11 exceeds the amount of discharged water from the discharge port 13, the aeration tank Twelve water levels rise. When the water depth of the air diffuser 22 becomes deeper than 1.6 m due to the rise in the water level, the atmospheric pressure in the air supply pipe 23 becomes 19 kPa or more, and the second atmospheric pressure sensor 32 outputs the second atmospheric pressure abnormality signal. That is, the abnormality detection device 30 can operate the alarm device 40 by detecting the accumulation of suspended matter or the like before the discharge port 13 or the discharge pipe 14 is blocked. Therefore, the owner or the like of the septic tank 10 can request a repair or the like from an inspector to prevent the discharge port 13 or the discharge pipe 14 from being blocked and the sewage from overflowing from the septic tank 10.

  Even if the water depth of the air diffuser 22 becomes deeper than 1.6 m for the first time after the outlet 13 or the outlet pipe 14 is blocked, the alarm device 40 issues an alarm. Since the distance from the water surface in the aeration tank 12 to the upper wall 15 of the septic tank 10 is 10 to 20 cm, the owners of the septic tank 10 request repairs from the inspector before the sewage overflows from the septic tank 10. It becomes possible.

  Here, if the second atmospheric pressure is set to 18 kPa, when the water depth of the air diffuser 22 becomes deeper than 1.5 m (when the outlet 13 having an inner diameter of 100 mm is submerged under the water surface in the septic tank 10), the second Since the atmospheric pressure sensor 32 outputs the second atmospheric pressure abnormality signal, it becomes possible to detect the accumulation of suspended matter or the like at the outlet 13 or the outlet pipe 14 earlier.

(Air leakage in air supply piping etc.)
Even if the septic tank 10 is in a normal water depth state (a state in which the discharge is normal), a crack or the like occurs in the air supply pipe 23 or an air supply abnormality of the blower 21 (for example, air leakage of a diaphragm) occurs. Since the amount of air supplied from the diffuser 22 to the sewage in the aeration tank 12 is reduced, the sewage purification function of the aeration tank 12 is reduced, and eventually the polluted discharged water is discharged from the septic tank 10. It reaches. The same applies to the case where the amount of air supplied to the sewage in the aeration tank 12 is reduced or the blowing is stopped due to an electrical abnormality of the blower.

  The cracks in the air supply pipe 23, the air supply abnormality of the blower 21, and the electrical abnormality are detected by the first atmospheric pressure sensor 31 when the air pressure in the air supply pipe 23 becomes lower than the first air pressure. Then, since the abnormality detection device 30 operates the alarm device 40, the owner of the septic tank 10 or the like can prevent contamination of the discharged water by, for example, requesting repairs from an inspection company.

(Clogging of diffuser)
Even if the septic tank 10 is in a normal water depth state, if the air diffuser 22 is clogged, the amount of air supplied to the sewage in the aeration tank 12 is reduced, and the sewage purification function of the septic tank 10 is eventually achieved. Also decreases.

When the air diffuser 22 is clogged, the air pressure in the air supply pipe 23 rises, and eventually becomes higher than the second air pressure, the air pressure sensor 32 outputs a second air pressure abnormality signal, and the abnormality detection device. Since 30 operates the alarm device 40, the owner of the septic tank 10 can prevent contamination of the discharged water due to clogging of the air diffuser, for example, by requesting a repair from an inspector.
The abnormality detection device for the septic tank and the septic tank blower according to the present invention described above is not limited to the above-described embodiment, and can be modified without departing from the spirit thereof.

  For example, it may be determined from the atmospheric pressure detection value output from one atmospheric pressure detection element that the atmospheric pressure in the air supply pipe has decreased from the first atmospheric pressure or has become higher than the second atmospheric pressure. As such an atmospheric pressure detection element, there is an atmospheric pressure detection element whose output voltage or resistance value changes corresponding to the atmospheric pressure, and a device for detecting such a change in voltage or resistance value using a microprocessor or the like is an atmospheric pressure sensor. Thus, a change in air pressure in the air supply pipe may be determined. The atmospheric pressure sensor in the present invention is not limited by the names of the atmospheric pressure sensor, the pressure sensor, the pressure switch, and the like as long as the atmospheric pressure in the air supply pipe can be detected.

  Further, if the abnormality detection device transmits the first and second atmospheric pressure abnormality signals to the alarm device separately, the alarm device can issue a pressure drop and a pressure increase in the air supply pipe as separate alarms. . Furthermore, if the alarm device 40 is a communication device that automatically notifies the inspection company of abnormality in the septic tank and the blower, it is possible to repair the septic tank and the blower more quickly.

It is a figure which shows schematic structure of the septic tank 10, the air blower 20, the abnormality detection apparatus 30 which concerns on this invention, and the alarm device 40. It is a figure which shows schematic structure of the abnormality detection apparatus 30 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Septic tank 13 Outlet 20 Septic tank blower 21 Blower 22 Air diffuser 23 Air supply piping 30 Abnormality detector 31 First atmospheric pressure sensor 32 Second atmospheric pressure sensor

Claims (3)

  In the septic tank blower having a blower, an air diffuser that diffuses air into the sewage in the septic tank, and an air supply pipe that guides air blown from the blower to the diffuser, A pressure sensor is provided which is connected and outputs an atmospheric pressure abnormality signal when the pressure in the air supply pipe becomes lower than the first pressure or becomes higher than the second pressure. Abnormality detection device for septic tank and blower for septic tank.   The first air pressure is lower than the air pressure in the air supply pipe that is generated according to the water depth of the air diffuser when the discharged water is normally discharged from the discharge port of the septic tank. Item 6. An abnormality detection device for a septic tank and a septic tank blower according to item 1.   The second air pressure is higher than the air pressure in the air supply pipe generated according to the water depth of the air diffuser when the discharged water is normally discharged from the outlet of the septic tank. Item 6. An abnormality detection device for a septic tank and a septic tank blower according to item 1.

Images