JPH10180241A - Medical waste water treating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently treat medical waste water. SOLUTION: This system is a medical waste water system for treating the medical waste water generated at a medical site, and is provided with a raw water tank 10 for housing the medical waste water, a heating tank 30 having sealing performance, housing the medical waste water introduced from a raw water tank 10 and heating, an air discharge means for returning the air in the heating tank 30 to the raw water tank 10 at an early stage of heating in the heating tank 30 and a water vapor discharge means for discharging the water vapor in the heating tank 30 after heating at the heating tank 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a medical wastewater treatment system for treating medical wastewater generated at a medical site.

[0002]

2. Description of the Related Art At medical sites such as surgery and dissection in hospitals and the like, medical drainage mixed with blood, body fluids and the like of patients is generated during surgery and dissection or when washing surgical instruments and the like. By the way, in recent years, the risk of infection by pathogenic microorganisms such as hepatitis B and HIV has been regarded as a problem, and at the time of surgery for patients infected with these pathogenic microorganisms, the pathological microorganisms are contained in medical wastewater. This means that the treatment of medical wastewater is a problem. Conventionally, as a method of treating medical wastewater, a general method has been to disinfect and disinfect a medical effluent, add a neutralizing agent, and dilute and discharge the sewage into a sewer.

[0003] However, the above-mentioned chemical treatment method not only requires a great deal of effort and time for sterilization treatment, but also has a risk of adversely affecting the discharge destination due to water quality deviating from the discharge standard. And maintenance costs such as dilution water costs and facility corrosion countermeasures, etc., have risen.

[0004] In order to solve these problems, an application has been filed as a "sterilization device for drainage generated from an autopsy room or the like" (JP-A-4-87678). FIG. 4 shows an outline of the application (hereinafter, referred to as a prior application). The water storage tank 201 is a water tank for temporarily storing medical wastewater flowing through the drain pipe 204, and includes a first water level sensor 205. Above the water storage tank 201, an elevated tank 202 provided with a reflux pipe 250 for both air release and overflow is mounted, and a first tank 202 having a water pump 207 and a valve 208 is provided.
The drainage pipe 206 quantitatively stores medical wastewater from the water storage tank 201. Elevated tank 202
Is disposed below the sterilizing tank 2 surrounded by the heat exchange unit 233.
31 and a steam sterilizer 203 including a temperature sensor 212 and a second water level sensor 211 are provided. Heat exchange unit 2
A control valve 232 is connected to a steam supply pipe 252 for supplying heated steam from a heat source (not shown) to an inlet of the heat exchanger 33, and an exhaust pipe 254 is connected to an outlet of the heat exchange unit 233. The medical drainage in the tank 231 is
It is made to heat to ° C. In addition, sterilization tank 2
31 is provided with a second drain pipe 2 from the elevated tank 202.
09 is connected via a valve 210, and an outlet is connected to a discharge pipe 214 provided with a discharge valve 213 so as to discharge heated and sterilized treated water to a sewer (not shown) or the like.

[0005]

However, according to the sterilization tank heating method of the prior application, a closed structure in which air in the sterilization tank 231 cannot be drawn out of the tank during heating is adopted. Due to the expansion of the residual air, the pressure inside the sterilization tank 231 becomes high, so that considerable pressure resistance is required. Furthermore, when the discharge valve 213 is opened after the completion of the heat sterilization, and the treated water in the sterilization tank 231 is directly discharged from the discharge pipe 214, the high-temperature and high-pressure treated water is suddenly released to the atmospheric pressure, and the inside of the sterilization tank 231 is removed. There is a problem that the treated water is bumped. Therefore, the discharge valve 21
It was necessary to pay close attention to the operation 3 or leave it for a long time to cool the treated water.

[0006] Therefore, "Sterilization equipment for drainage generated from dissection room or the like" by the same applicant as the prior application (Japanese Patent Laid-Open No. 4-35545).
No. 78), a measure has been proposed in which an air vent via a sterilizer is attached to a water storage tank and a sterilizer. However, also in this case, considerable skill is required to operate the on-off valve in the middle of the air vent pipe (not shown).

For this reason, in both the prior application and the above-mentioned improvement measures, the temperature of the heat treatment of the medical wastewater is set to 60 to 100 ° C. in order to avoid the above problem. This is compatible with the boiling disinfection method of the Ministry of Health and Welfare's guidelines, but has a drawback that only a part of pathogenic bacteria can be treated because a high temperature of, for example, 121 ° C. or higher for sterilizing hepatitis B virus cannot be obtained.

Accordingly, the present invention provides a medical wastewater treatment system capable of treating medical wastewater at a high temperature, not requiring high durability of a sterilization tank (heating tank), and preventing the above-described bumping. The task is to

[0009]

According to a first aspect of the present invention, there is provided a medical wastewater treatment system for treating medical wastewater generated at a medical site, wherein the medical wastewater contains medical wastewater. A drainage storage tank, having a hermetic property, a medical drainage heating tank that stores and heats medical drainage guided from the medical drainage storage tank, and a medical drainage heating tank in the medical drainage heating tank at an initial stage of heating in the medical drainage heating tank. It is characterized by having an air discharging means for discharging air and a water vapor discharging means for releasing water vapor in the medical waste water heating tank after heating in the medical waste water heating tank.

[0010] In this system, the medical wastewater guided from the medical wastewater storage tank is heated and treated in the medical wastewater heating tank, so that the medical wastewater can be sterilized without using a chemical, and other environments can be sterilized. Has no adverse effect on At the beginning of the heating, the air in the medical drainage heating tank is released. For this reason, it is possible to prevent the air from expanding and the inside of the medical wastewater heating tank to be at a high pressure, thereby making it possible to lower the pressure resistance of the medical wastewater heating tank and to reduce the cost. After the heating, the steam in the medical wastewater heating tank is released. As a result, the pressure in the medical drainage heating tank, which has been increased by heating, is reduced. Therefore, when the medical wastewater (after the heat treatment) is subsequently discharged from the medical wastewater heating tank, bumping is prevented.

The invention according to a second aspect is the invention according to the first aspect, characterized in that the discharge of the air by the air discharge means is performed to the medical drainage storage tank.

When releasing the air in the medical wastewater heating tank, not only the air but also a part of the medical wastewater may be released as steam. For this reason, when discharging to the outside, a disinfection filter or the like must be attached to the release portion. However, in the present invention, the air (and the steam of medical wastewater) is returned to the medical wastewater storage tank,
Again, to be guided into the medical drainage heating tank and processed,
This is not necessary, and the system is simplified and the cost is reduced.

The invention according to claim 3 is the invention according to claim 1, wherein the medical wastewater containing cooling water and heated in the medical wastewater heating tank is guided, and the medical wastewater is cooled. It has a cooling tank which cools with water, and discharge of air by the air discharge means is performed to the cooling tank.

According to the present invention, the air in the medical wastewater heating tank is discharged to the cooling tank. For this reason, unlike the invention according to claim 2, the air is not returned to the medical drainage storage tank and guided to the heating tank again to be heated, and in that respect, the treatment of medical wastewater is efficient. It becomes something. It is desirable that a disinfection device be provided in the middle of the discharge to the cooling tank. That is, the invention according to claim 2 and the invention according to claim 3 have an advantage and a disadvantage.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Next, a first embodiment of the present invention will be described with reference to FIGS. This embodiment corresponds to claim 1
And an embodiment of the invention according to claim 2. The system includes a raw water tank 10 (medical wastewater storage tank), a heating tank 30 (medical wastewater heating tank), a heating source 60, a water supply tank 70, a cooling tank 90, and ancillary equipment, and includes a control device (not shown). ing. The control device has a CPU and a storage device. The storage device stores a program or the like corresponding to an operation described later, and the CPU controls the present system based on the program and the like.

A filter tank 12 is provided upstream of the raw water tank 10, and a filter 14 for removing solids in medical wastewater (raw water) is accommodated in the filter tank 12. From the top of the raw water tank 10, a bubbling pipe 19
Is inserted. The bubbling pipe 19 includes a raw water level gauge 16 for detecting the liquid level in the raw water tank 10 and a raw water stirring blower 18. The raw water tank 10 includes a heating tank 30.
A raw water supply pipe 20 is provided. The raw water supply pipe 20 is provided with a raw water pump 22 and a raw water valve 24. The raw water valve 24 is a valve that opens and closes a pipe (raw water supply pipe 20) through which raw water flows (the same applies hereinafter).

The heating tank 30 is a hermetic tank having a coupling flange and an inspection hole, and is provided with a jacket portion 32 so as to wrap around the lower liquid phase portion. A steam container 34 is formed inside the jacket 32. Further, the heating tank 30 is provided with a steam pressure gauge 36 which detects a steam pressure supplied to the steam storage section 34 and gives an alarm when the detected steam pressure exceeds an upper limit. A heating tank level gauge 40 and a heating tank pressure gauge 42 are provided on the main body side wall of the heating tank 30.
And the respective detection ends of the raw water thermometer 44 are provided. The heating tank level gauge 40 detects the level of raw water. The heating tank pressure gauge 42 detects the gas phase pressure in the tank, and issues an alarm when the pressure exceeds a predetermined upper limit. Raw water thermometer 44
Is for detecting the temperature of raw water, and the heating state of the raw water is controlled based on the detection result. At the top of the heating tank 30, an outflow pipe 48 such as air that reaches the raw water tank 10 via a flow rate control valve 46 such as a needle valve and a discharge air opening / closing valve 47 is connected. A drain pipe 52 having a drain valve 50 is connected to the bottom of the heating tank 30. An overflow pipe 56 is connected to the raw water tank 10 via an overflow valve 54 slightly above the heating tank 30.

Fuel and tap water flow into a heating source (for example, a steam boiler) 60, and the fuel is burned to heat the tap water to generate steam. The steam is guided into the steam accommodating portion 34 of the jacket portion 32 through a steam flow passage 64 having a steam valve 62.

The water supply tank 70 is provided with a water supply pipe 72 for supplying tap water. A water supply pump 74 is provided at the base of the water supply pipe 72. The distal end side of the water supply pipe 72 is branched into a cleaning water supply pipe 76 and a cooling water supply pipe 82. The cleaning water supply pipe 76 enters the heating tank 30, and a cleaning water jet nozzle 78 is provided at a tip end thereof. A washing valve 79 is provided in the middle of the washing water supply pipe 76.

On one side of the cooling tank 90, the drain pipe 5 described above is provided.
2 and the cooling water supply pipe 82 are connected. The cooling water supply pipe 82 has a cooling valve 80. A discharge pipe 92 is connected to the other side of the cooling tank 90, and a thermometer 94 for detecting the temperature of the discharge water is provided. The temperature of the discharged water is controlled based on the detection result of the thermometer 94.

The operation of the present system configured as described above will be described. This system is automatically controlled and operated by the above-mentioned control device (not shown). Medical wastewater (raw water) from a medical site first flows into the filter tank 12, and solids in the raw water are removed by the filter 14, and then flows into the raw water tank 10. In addition, the filter 14 containing the solid matter after the removal of the solid matter is incinerated separately after drainage treatment.

In the raw water tank 10, the liquid level of the raw water is detected by the raw water tank liquid level gauge 16. When the raw water level in the raw water tank 10 is equal to or more than a predetermined value at the stage when the heat treatment step described later is completed, the raw water valve 24 and the overflow valve 54 are opened and the raw water pump 22 is driven. And raw water tank 1
0 is introduced into the heating tank 30 through the raw water supply pipe 20, and the air in the heating tank 30 flows through the overflow pipe 56 into the raw water tank 10.
Will be released.

In the heating tank 30, the level of the raw water in the heating tank 30 is detected by the heating tank level gauge 40, and when the liquid level reaches a predetermined height, the supply of the raw water from the raw water tank 10 is stopped. You. In the unlikely event that the heating tank level gauge 40 or the like fails,
Raw water flows out of the overflow pipe 56 and returns to the raw water tank 10, so that excessive water storage in the heating tank 30 is prevented.

Next, after closing the raw water valve 24 and the overflow valve 54, the steam valve 62 is opened. Then, the high-temperature steam is guided from the boiler 60 to the steam storage portion 34 of the jacket portion 32 of the heating tank 30, and the medical wastewater in the heating tank 30 is heated. At the beginning of the heating, the air in the heating tank 30 is vented. That is, until the temperature of the medical wastewater in the heating tank 30 reaches about 100 ° C. at the beginning of heating, the exhaust valve 47 and the flow rate adjusting means 46 are opened, and the heated air in the heating tank 30 flows out of air or the like. The water is slowly released into the raw water in the raw water tank 10 via the pipe 48. This step corresponds to the air discharging means of the present invention.

If the air is not vented, the pressure in the heating tank 30 rises because the heating tank 30 is heated and the air in the heating tank 30 also becomes hot and thermally expands. However, if the above-described air bleeding is performed, the pressure in the heating tank 30 is only pressurized by the vapor pressure, so that it is not necessary to increase the pressure resistance of the heating tank 30 against the subsequent heating or pressure increase, which is economical.

Also, at about 1 atm, which is the initial stage of heating, about 10 atm.
Until the temperature reaches 0 ° C, the amount of medical wastewater vaporized is small.
Most of what is led to the raw water tank 10 is air,
It is inevitable that some amount of medical wastewater vapor is mixed.
However, since this steam is guided to the raw water tank 10 together with the air, the pathogenic microorganisms and the like are not released to the outside. Also, as described above, the extremely high temperature air is supplied to the raw water tank 10.
Since the raw water is heated by being guided into the inside, the heating load of the raw water thereafter is reduced.

When the initial air release is completed, the exhaust valve 47
Is closed and heated to a predetermined temperature. And
When the predetermined value is reached, the steam valve 62 is once closed, and thereafter, the opening of the steam valve 62 is adjusted based on the detection result of the raw water thermometer 44, and the predetermined temperature is maintained for a predetermined time. For example, at 115 ° C. for 30 minutes, at 121 ° C. for 20 minutes, or at 135 ° C.
For 30 minutes. In this way, the raw water is sterilized at a high temperature.

After the sterilization is completed, the pressure in the heating tank 30 is reduced. If the high-temperature and high-pressure treated water in the heating tank 30 (that is, the sterilized raw water) is directly discharged from the drain pipe 52, the pressure in the heating tank 30 becomes zero at once, and the treated water may suddenly boil in the heating tank. It is. That is, the exhaust valve 47 is opened,
Thereby, the steam from the treated water in the heating tank 30 is gradually discharged into the raw water tank 10 through the outflow pipe 48 such as air while the flow amount is suppressed by the flow control valve 46 which is in a slightly open state. This step corresponds to the water vapor releasing means of the present invention. This prevents bumping from occurring. In addition, as described above, the high-temperature steam is guided to the raw water tank 10, whereby the temperature of the raw water in the raw water tank 10 increases, and the heating load in the next step is reduced as in the case of the above-described initial air release. .

After the above-described pressure reducing operation, the drain valve 50 is opened. Thereby, the high-temperature treated water in the heating tank 30 is discharged to the cooling tank 90 via the drain pipe 52. Cooling water from the water supply tank 70 is stored in the cooling tank 90 in advance. That is, the opening of the cooling valve 80 is adjusted based on the detection result of the cooling tank thermometer 94, and an appropriate amount of cooling water is supplied from the water supply tank 70.

In this manner, the high-temperature treated water in the heating tank 30 is cooled in the cooling tank 90 to 45 ° C. or less, which is the specified discharge temperature according to the sewerage method, and discharged from the discharge pipe 92. Therefore, there is no adverse effect on the downstream environment of the emitted light.

The above steps are repeated, and the raw water (medical wastewater) in the raw water tank 10 is sequentially processed and discharged. After all the processes are performed, the cleaning valve 79 is opened, the water supply pump 74 is driven, and the cooling water in the water supply tank 70 is jetted from the cleaning water jet nozzle 78 through the cleaning water supply pipe 76. . Thereby, the residue in the heating tank is washed.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. This embodiment is an embodiment of the third aspect of the present invention. In this embodiment, the outflow pipe 48 such as air is connected to the cooling tank 90 instead of the raw water tank 10. Therefore, there is a possibility that pathogenic microorganisms may be contained in a small amount in the exhaust gas flowing out of the outflow pipe 48 such as air at the initial stage of heating. Therefore, the exhaust gas is sterilized by inserting the sterilizer 101 in the middle of the outlet pipe 48 such as air. The sterilizer 101 may use any one of a chemical sterilization method, a heat sterilization method, and a sterilization filter method.

As shown by a two-dot chain line in FIG. 3, a three-way valve 102 is provided in the middle of the outflow pipe 48 such as air.
From 2, the sterilizer 101 is bypassed and an outflow pipe 48 such as air is discharged.
May be provided. In that case, the steam after heat sterilization is guided to the cooling tank 90 via the bypass conduit 104. At this time, the opening degree of the bypass valve 103 provided in the middle of the bypass pipe 104 and the opening degree of the flow control valve 46 are made different from each other, so that the time of air release at the time of initial heating and the sterilization completion The time of subsequent release of water vapor can be different.

Although the heating source 60 has been described as a steam boiler, a hot water boiler system or a system in which raw water is directly heated by an electric heater may be used. Furthermore, the temperature control in the heating tank 30 has been described as adjusting the steam valve 62 by the raw water thermometer 44, but a preset time control method may be adopted.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a medical wastewater treatment system according to a first embodiment of the present invention.

FIG. 2 is an enlarged view around a heating tank of FIG. 1;

FIG. 3 is a diagram showing an outline of a medical wastewater treatment system according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram of a conventional medical wastewater treatment system.

[Explanation of symbols]

 10: Raw water tank (medical wastewater storage tank) 30: Heating tank (medical wastewater storage tank) 48: Outflow pipe such as air 90: Cooling tank

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinya Ito 1-1-1, Chiyodabashi, Chigusa-ku, Nagoya-shi, Aichi 13-617 (72) Inventor Naoyuki Mizumoto 1-6-17, Kyomachibori, Nishi-ku, Osaka-shi, Osaka No. Plantech Inc.

Claims (3)

[Claims] 1. A medical wastewater treatment system for treating medical wastewater generated at a medical site, comprising: a medical wastewater storage tank that stores the medical wastewater; and a hermetic sealant, which is guided from the medical wastewater storage tank. A medical wastewater heating tank for containing and heating medical wastewater, an air discharging means for releasing air in the medical wastewater heating tank at an early stage of heating in the medical wastewater heating tank, and the medical wastewater after heating in the medical wastewater heating tank A medical wastewater treatment system comprising: a water vapor discharging unit that releases water vapor in a heating tank. 2. The medical wastewater treatment system according to claim 1, wherein the air is discharged from the air discharge means to the medical wastewater storage tank. 3. The medical wastewater treatment system according to claim 1, wherein the medical wastewater containing cooling water, heated in the medical wastewater heating tank, is guided, and the medical wastewater is cooled by the cooling water. A medical wastewater treatment system, comprising: a cooling tank for cooling; and discharging air by the air discharging means to the cooling tank.