JP2011160883A - Heat sterilization apparatus for polluted water discharged from experimental animal-rearing facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sterilization apparatus capable of efficiently sterilizing or disinfecting polluted water including solids discharged from a rearing facility of experimental animals at a relatively low treatment cost. <P>SOLUTION: The sterilization apparatus includes a solid-liquid separator 5 for filtering out solids from polluted water including solids discharged from the rearing facility of experimental animals, and a sterilization tub 7 for heating/sterilizing the separated liquid. The solids remaining within the solid-liquid separator 5 and the liquid within the sterilization tub 7 are simultaneously heated/sterilized by feeding high-temperature steam into the heating/sterilization tub 7 from the solid-liquid separator 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus for solid-liquid separation and high-temperature sterilization of wastewater containing solid matter discharged from a laboratory animal breeding facility.

  Conventionally, many experimental animals have been used for research on infectious diseases caused by pathogenic organisms (bacteria, viruses, parasites, fungi, etc.), development of various vaccines, and research on genetically modified animals.

The treatment of domestic animal wastewater is generally outsourced to specialists, but basically there is a risk that pathogens etc. are mixed in the wastewater discharged from animal breeding experimental facilities. It is desirable to process in the breeding facility.
As a method for treating sewage discharged from such laboratory animal breeding facilities in the facility, Japanese Patent Application Laid-Open No. 2007-135402 (Patent Document 1) discloses a catalyst in a housing provided with a discharge port for heated air. A method has been proposed in which a combustion treatment unit is arranged and sewage discharged from an animal breeding experiment facility is incinerated in this housing.

  However, in such a method, there is a problem that the treatment facility becomes large, and a huge amount of heat is required for incineration (high temperature treatment) to a liquid, and the treatment cost of sewage is increased.

  Also, in the laboratory animal breeding facility, using a solid-liquid separator, separate the sewage into solid components such as animal hair and liquid components, heat sterilize each separately, and then final treatment to the contractor. It is conceivable to outsource the heat treatment of the solid component and the liquid component separately. In addition to increasing the size of the treatment equipment in the facility, the concentrated component and the permeated component are individually heat sterilized, so There is a problem that the processing cost becomes high.

JP 2007-135402 A

The present invention has been made to solve such conventional problems, and efficiently sterilizes sewage containing solid matter discharged from a laboratory animal breeding facility such as an animal breeding laboratory facility at a relatively low processing cost. Alternatively, an object is to provide a sterilization apparatus that can sterilize.
In addition, since the apparatus of the present invention can be used for both heat sterilization and heat sterilization, in the following description, “heat sterilization” simply means “heat sterilization or heat sterilization”.

  The apparatus for heat sterilization of sewage containing solid matter discharged from the laboratory animal breeding facility of the present invention includes a sewage tank that contains sewage containing solid matter flowing from a side groove, sewage piping, etc. in the laboratory animal breeding facility; A solid-liquid separator disposed on the downstream side of the sewage tank for filtering the solid matter from the sewage containing the solid matter; and disposed on the downstream side of the flow path of the solid matter separated by the solid-liquid separator. A solid storage tank; a sterilization tank for storing and sterilizing by heating the liquid disposed on the downstream side of the liquid flow path through the solid-liquid separator; and a liquid disposed on the downstream side of the sterilization tank In the heat sterilization apparatus provided with a storage tank; and high-temperature steam sterilization means, the high-temperature steam sterilization means sends high-temperature steam into the solid-liquid separator through an inflow pipe of sewage containing solid matter. Further, the high-temperature steam that has passed through the solid-liquid separator is added to the steam. And performing bubbling with pumped into a sterile tank.

  The solid-liquid separator used in the present invention is arranged in the sterilization tank, and the high-temperature steam from the high-temperature steam sterilization means is fed into the solid-liquid separator from the inflow pipe of sewage containing solid matter. Then, bubbling in the sterilization tank may be performed as it is with high-temperature steam that has passed through the solid-liquid separator.

  The solid-liquid separator used in the present invention is composed of an outer cylinder having a liquid discharge port and an inner cylinder of a metal mesh having a fine pore diameter, for example, 250 μm, and the sewage containing the solid matter passes through the inflow pipe. It flows into the inner cylinder, where the liquid in the sewage passes through the metal mesh of the inner cylinder and is sent from the liquid outlet of the outer cylinder to the solid-liquid separator. Further, the solid matter remaining in the inner cylinder is discharged from the inner cylinder bottom portion through the solid cylinder discharge pipe penetrating the outer cylinder bottom portion by the operation of the opening / closing valve. In addition, when installing a solid-liquid separator in a sterilization tank, the outer cylinder of a solid-liquid separator becomes unnecessary.

  In addition, it is desirable to insert a coaxial impeller into the solid-liquid separator, and to rotate the impeller during cleaning to scrape off the solid matter adhering to the metal mesh of the inner cylinder.

  Furthermore, it is desirable to attach a sterilization filter for sterilizing and releasing the gas in the sterilization tank. This sterilization filter is sterilized by the heat of the exhaust gas when high-temperature exhaust gas (water vapor) bubbling the liquid in the sterilization tank passes.

  A heating / cooling jacket for circulating high-temperature steam or cooling water is provided on the outer periphery of the sterilization tank, so that the time required for the heating / cooling process can be shortened or heated during cleaning to enhance the cleaning effect.

  In addition, a sewage inflow pipe that opens to the inner cylinder of the solid-liquid separator and a solid substance discharge pipe that opens to the inner cylinder of the solid-liquid separator are steam pipes that can supply high-temperature steam, washing water, and compressed air, respectively, by valve operation. It is desirable to connect water piping and compressed air piping.

  Furthermore, in the present invention, two sets of the solid-liquid separator and the sterilization tank to which the various pipes described above are connected are installed in parallel, and the inflow of sewage, heat sterilization, washing, rinsing, solids, By performing each process such as liquid discharge by shifting the timing of each group, the efficiency of processing can be improved.

The effects of the present invention are as follows.
(1) Since pathogenic organisms and the like contained in laboratory animal excrement and the like are sterilized, the treatment can be entrusted to a specialist in the same manner as general sewage.
(2) Since the solid and liquid separated by the solid-liquid separator can be sterilized at the same time, heat utilization efficiency is high and equipment can be simplified.

It is a figure which shows schematically the structure of the 1st Embodiment of this invention. It is a figure which expands and shows the principal part of 1st Embodiment. It is a figure which shows the structure of 2nd Embodiment schematically. It is a figure which expands and shows the principal part of 2nd Embodiment. It is a figure which shows the structure of 3rd Embodiment schematically.

Embodiments of the present invention will be described below.
(First embodiment)
In FIG. 1, sewage containing solid matter such as animal hair flowing in a gutter of a laboratory animal breeding experiment facility is once collected in a sewage tank 2 by a pipe 1. The sewage stored in the sewage tank 2 is sent to the solid-liquid separator 5 via the pipe 4 by the pump 3.
Here, solid matter in the sewage is removed by the solid-liquid separator 5, and the separated liquid is sent to the sterilization tank 7 from the pipes 6 a and 6 b.

When the liquid in the sterilization tank 7 reaches a predetermined level, high-temperature steam from the steam pipe is sent to the solid-liquid separator 5, and the solid in the solid-liquid separator 5 and the liquid in the sterilization tank 7 are heated. The high-temperature water vapor released into the space of the sterilization tank 7 by bubbling passes through the sterilization filter 10 while being heat-sterilized, and is released into the atmosphere. Thereafter, the solid in the solid-liquid separator 5 is discharged to the solid storage tank 8 through the pipe 11, and the liquid in the sterilization tank 7 is discharged to the liquid storage tank 13 through the pipe 12.
These sterilized solids and liquids are outsourced to specialists.
In the figure, V is an open / close valve, J is a steam heating and water cooling jacket, “steam”, “washing water”, and “compressed air” are “steam piping”, “washing water piping”, and “compressed air piping”, respectively. It is.

Hereinafter, this embodiment will be described in detail with reference to FIG.
The solid-liquid separator 5 is coaxially inserted into the outer cylinder 5a and the outer cylinder 5a, which have two branches 6a and 6b for discharging liquids and a branch pipe 6c into which heated steam is fed. And an inner cylinder 5b made of a metal mesh having a pore diameter of 250 μm. The upper end of the inner cylinder 5b of the solid-liquid separator 5 is connected to a pipe 4 for supplying sewage through an on-off valve V1, and the lower end of the inner cylinder 5b is connected to a pipe following the solid material storage tank through an on-off valve V2. ing. An impeller 14 that scrapes off the solid matter adhering to the metal mesh is coaxially inserted in the inner cylinder 5 b of the solid-liquid separator 5. Reference numeral M denotes a motor for driving the impeller 14.

The sterilization tank 7 is, for example, a cylindrical body having a diameter of 1 m and a capacity of 500 L and a hemispherical upper and lower surface. An inflow port (short pipe) 7 a provided on the upper side surface of the sterilization tank 7 Is connected to an inflow port (short pipe) 7b provided on the lower side surface of the solid-liquid separator 5 through an open / close valve V3. At the bottom of the sterilization tank 7, a discharge port for discharging the liquid to the liquid storage tank 8 by opening the valve V4 is provided.
Further, a sterilization filter 10 communicating with the space in the sterilization tank 7 is installed at the top of the sterilization tank 7, and a heating / cooling jacket J0 capable of feeding high-temperature steam and cooling water is provided on the outer periphery. It has been.

A steam pipe S, a washing water pipe W, and a compressed air pipe A are connected to the pipe 4 for supplying the sewage to the solid-liquid separator 5 via the open / close valves Vs1, Vw1, and Va1, respectively. An opening / closing valve V5 is provided in the pipe 4 between the opening / closing valves Vs1, Vw1, Va1 and the pump 3.
A pipe 15 is connected to the lower end portion of the outer cylinder 5a of the solid-liquid separator 5 via an on-off valve V6. The pipe 15 is connected to a steam pipe S via on-off valves Vs2, Vw2, Va2, respectively. The cleaning water pipe W and the compressed air pipe A are connected.

  Next, a processing method according to this embodiment will be described. In each of the following steps, the open / close valve provided in each pipe is operated by a control device controlled by a timer, a liquid level meter, a thermometer, etc. (not shown).

(Sewage liquid / solid-liquid separation)
Hot water vapor (100 ° C. or higher) is supplied to the jacket J of the sterilization tank 7, the open / close valves V 1, V 3, V 5 are opened, and the pump 3 is driven so that the sewage containing solid matter in the sewage tank 2 becomes solid liquid. The liquid is fed into the inner cylinder 5 b of the separator 5. Solid matter in the sewage is blocked by the metal mesh of the inner cylinder 5b and remains in the inner cylinder 5b, and only the liquid that has permeated the inner cylinder is fed into the sterilization tank 7 from the pipes 6a and 6b. For example, when the liquid in the sterilization tank 7 reaches a full water level after 1 minute from the start of the pump 3, the open / close valve V <b> 5 is closed and the supply of sewage to the solid-liquid separator 5 is stopped.

(Heat sterilization)
Next, the on-off valves Vs1, Vs2, and V6 are opened, and high-temperature steam is sent into the solid-liquid separator 5. The high-temperature water vapor sent into the solid-liquid separator 5 passes through the metal mesh of the solid-liquid separator 5, bubbles the liquid in the sterilization tank 7 through the pipes 6 a and 6 b, and the upper space of the sterilization tank 7. And is passed through the sterilizing filter 10 while being heated and released out of the system.
Water vapor is supplied from the open / close valves Vs1 and Vs2, for example, for 2 minutes. During this time, the solid matter in the solid-liquid separator 5, the liquid in the sterilization tank 7, and the sterilization filter are usually at a temperature of 80 ° C. or higher. And sterilization is performed.

(cooling)
The on-off valves Vs1, Vs2 and the on-off valve for sending high-temperature steam into the jacket J are closed, the on-off valves Va1, Va2 are opened, and compressed air is fed into the solid-liquid separator 5 at the same time. The cooling water is poured into the jacket J by the omitted valve operation.
The bubbling with the compressed air and the cooling with the water cooling jacket J are performed, for example, for 2 minutes, whereby the solid in the solid-liquid separator 5 and the liquid in the sterilization tank 7 are cooled to a temperature at which they can be handled.

(Discharge of solids and liquids)
Open / close valve V6 and open / close valve for injecting cooling water into jacket J are closed, open / close valves V2 and V4 are opened, and impeller 14 is rotated to scrape solid matter from the metal mesh and contain the solid matter. The liquid is discharged into the tank 8, and the liquid is discharged into the liquid storage tank 13. Thereafter, the on-off valves Va1, Va2, V6 are opened, compressed air is fed into the solid-liquid separator 5 and the sterilization tank 7, and high-temperature steam is fed into the jacket J, so that the solid-liquid separator The solid in 5 and the liquid in the sterilization tank 7 are discharged as completely as possible.

(Washing / drainage)
The on-off valves Vs1, Vs2, Vw1, Vw2, V6 and the on-off valve for sending high-temperature water vapor into the jacket J are opened, and high-temperature water vapor and washing water are fed into the solid-liquid separator 5. The high-temperature steam and washing water sent into the solid-liquid separator 5 pass through the metal mesh of the solid-liquid separator 5, enter the sterilization tank 7 through the pipes 6 a and 6 b, and the liquid in the sterilization tank 7. Bubbling.
Thereafter, the supply of high-temperature steam and washing water to the solid-liquid separator 5 is stopped, compressed air is introduced, the inside of the sterilization tank 7 is bubbled for a predetermined time, for example, 2 minutes, and then the open / close valves V2 and V4 are opened. Then drain.

(Rinse and drainage)
The on-off valve V6 is closed, the on-off valves Vw1, V1, V2, V4, V4 and the valve for sending high-temperature water vapor into the jacket J are opened, and the solid-liquid separator 5 is washed with washing water while heating the sterilization tank 7. For example, the inside of the sterilization tank 7 and the inside of the piping and the on-off valve that becomes the flow path are rinsed for 2 minutes, for example.
As described above, after washing and rinsing, sewage is sent in for a new treatment.

(Second Embodiment)
FIG. 3 is a diagram schematically showing the configuration of the second embodiment of the present invention, and FIG. 4 is an enlarged view showing the main part thereof. In these drawings, portions corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted. In addition, 2nd Embodiment removes the outer cylinder 5a of the solid-liquid separator 5 in 1st Embodiment, and installs only the inner cylinder 5b in the sterilization tank 7, and is comprised.

In FIG. 3, sewage containing solid matter such as animal hair that has flowed into a gutter or the like of an experimental animal breeding experiment facility is once collected in a sewage tank 2 by a pipe 1, and then passed through a pipe 4 by a pump 3. It is sent to the liquid separator 5.
Solid matter in the sewage is removed by the solid-liquid separator 5, and the separated liquid is directly discharged into the sterilization tank 7.

  When the liquid in the sterilization tank 7 reaches a predetermined level, high-temperature steam from the steam pipe is sent to the solid-liquid separator 5, and the solid matter in the solid-liquid separator 5 and the liquid in the sterilization tank 7 are bubbled or the like. The high-temperature water vapor heated by bubbling and released into the space of the sterilization tank 7 by bubbling is released into the atmosphere after the sterilization filter 10 is heated and sterilized. Thereafter, the solid in the solid-liquid separator 5 is discharged to the solid storage tank 8 through the pipe 11, and the liquid in the sterilization tank 7 is discharged to the liquid storage tank 13 through the pipe 12.

FIG. 4 is an enlarged view showing the solid-liquid separator 5 and the sterilization tank 7.
In this embodiment, treatment of sewage containing solids is performed as follows.
Also in this embodiment, the following steps are performed by operating valves provided in each pipe by a control device controlled by a timer, a liquid level meter, a thermometer, etc. (not shown).

(Sewage liquid / solid-liquid separation)
High-temperature steam (100 ° C. or higher) is supplied to the jacket J of the sterilization tank 7, and sewage containing solids in the sewage tank 2 is fed into the inner cylinder 5 b of the solid-liquid separator 5. Solid matter in the sewage is blocked by the metal mesh of the inner cylinder 5 b and remains in the inner cylinder 5 b, and only the liquid that has permeated the inner cylinder is discharged into the sterilization tank 7. When the liquid in the sterilization tank 7 reaches the full water level, the supply of sewage to the solid-liquid separator 5 is stopped.
(Sewage liquid / solid-liquid separation)

(Heat sterilization)
Next, high-temperature water vapor is fed into the solid-liquid separator 5. The high-temperature water vapor sent into the solid-liquid separator 5 passes through the metal mesh of the solid-liquid separator 5 to bubble the liquid in the sterilization tank 7, and the high-temperature water vapor further heats the sterilization filter 10. However, it passes through and is discharged out of the system.

(cooling)
The supply of high-temperature steam is stopped, and compressed air is supplied into the solid-liquid separator 5, and at the same time, cooling water is injected into the jacket J.

(Discharge of solids and liquids)
Cooling water injection into the jacket J is stopped, the impeller 14 is rotated to scrape the solid matter from the metal mesh, and the solid matter is discharged to the solid storage tank 8, and the liquid is discharged to the liquid storage tank 13. Further, compressed air is fed into the sterilization tank 7, high-temperature steam is fed into the jacket J, and the solids in the solid-liquid separator 5 and the liquid in the sterilization tank 7 are discharged as completely as possible. .

(Washing / drainage)
Next, hot steam and washing water are fed into the solid-liquid separator 5. The high-temperature water vapor and the washing water sent into the solid-liquid separator 5 pass through the metal mesh of the solid-liquid separator 5 and enter the sterilization tank 7 to bubble the liquid in the sterilization tank 7.
Thereafter, the supply of the high-temperature steam and the washing water to the solid-liquid separator 5 is stopped, the compressed air is introduced, the inside of the sterilization tank 7 is bubbled for a predetermined time, for example, 2 minutes, and then drained.

(Rinse and drainage)
While the sterilization tank 7 is heated by opening a valve for sending high-temperature water vapor into the jacket J, the solid-liquid separator 5 and the sterilization tank 7 are rinsed with, for example, 2 minutes and then drained.
After this, new drainage is received again.

(Third embodiment)
FIG. 5 is an embodiment in which two sets of the solid-liquid separator and the sterilization tank of the first embodiment are installed in parallel and can be switched to either one via the switching valves V7 and V8. The same parts as those in FIG. 2 are denoted by the same reference numerals.
In this embodiment, for example, by operating the switching valves V7 and V8, first, sewage containing solid matter in the sewage tank 2 is fed to the solid-liquid separator 5a side, and passes through the mesh of the solid-liquid separator 5a. Then, the liquid is sent to the sterilization tank 7a, and then the solid-liquid separator 5a and the sterilization tank 7a are subjected to the heat sterilization process and the cleaning process as described with reference to FIG. In addition, by operating the switching valves V7 and V8, sewage containing solid matter in the sewage tank 2 is sent to the solid-liquid separator 5b on the other side, and a heat sterilization process is performed.

That is, the set of the solid-liquid separator 5a and the sterilization tank 7a and the set of the solid-liquid separator 5b and the sterilization tank 7b are processed in parallel by shifting each step.
Therefore, according to this embodiment, by providing two sets of solid-liquid separators and sterilization tanks, it becomes possible to treat sewage with twice the processing efficiency.

In the embodiment of FIG. 5, the solid-liquid separator 5 and the sterilization tank 7 of FIG. 2 are used. However, the solid-liquid separator 5 and the sterilization tank 7 shown in FIG. 4 can also be used.
In the above embodiment, the treatment of sewage includes `` sewage liquid feeding '', `` solid-liquid separation '', `` heat sterilization '', `` cooling '', `` solid and liquid discharge '', `` washing / drainage '', Although it was performed separately for each process of “rinse / drainage”, the present invention should not be limited to such an embodiment, and may be omitted, repeated, or combined with other methods as appropriate. Also good.

  1 ... sewage piping, 2 ... sewage tank, 3 ... sewage pump, 4, 4a, 4b, 6, 12 ... piping, 5 ... solid-liquid separator, 5a ... outer cylinder, 5b ... inner cylinder 7 ... Sterilization tank, 8 ... Steam piping, 9 ... Jacket, 10 ... Disinfection filter, 13 ... Liquid storage tank, 14 ... Impeller, V1-V8, Vs1, Vw1, Va1, Vs2, Vw2 , Va2: Open / close valve.

Claims (8)

A sewage tank for storing sewage containing solid matter flowing from a side ditch in a laboratory animal breeding facility, sewage piping, etc .;
A solid-liquid separator that filters solids from sewage containing the solids disposed downstream of the sewage tank;
A solids storage tank disposed on the downstream side of the flow path of solids separated by the solid-liquid separator;
A sterilization tank that contains the liquid disposed downstream of the liquid flow path that has passed through the solid-liquid separator and sterilizes by heating (including sterilization);
A liquid storage tank disposed downstream of the sterilization tank;
In a heat sterilization apparatus comprising high-temperature steam sterilization means,
The high-temperature steam sterilization means feeds the high-temperature steam into the solid-liquid separator through an inflow pipe of sewage containing solids, and further passes the high-temperature steam that has passed through the solid-liquid separator to the heat sterilization tank. A heat sterilization apparatus for sewage containing solid matter discharged from a laboratory animal breeding facility, wherein the apparatus is fed into the inside and bubbling.   The solid-liquid separator is disposed in the sterilization tank, and the high-temperature steam sterilization means sends high-temperature steam into the solid-liquid separator via an inflow pipe of sewage containing solids, and 2. Heating of sewage containing solid matter discharged from a laboratory animal breeding facility according to claim 1, wherein bubbling is performed by feeding high-temperature steam that has passed through the solid-liquid separator into the sterilization tank. Sterilizer.   The solid-liquid separator is made of a cylindrical body of a metal mesh having a fine pore diameter, and the sewage containing the solid flows into the cylindrical body through an inflow pipe, and the liquid in the sewage passes through the metal mesh and passes through the metal mesh. The apparatus for heat sterilization of sewage containing solid matter discharged from a laboratory animal breeding facility according to claim 1 or 2, characterized by flowing out of the cylindrical body.   The said solid-liquid separator has a coaxial impeller for removing deposits in the cylindrical body, and is discharged from the laboratory animal breeding facility according to any one of claims 1 to 3. A heat sterilizer for wastewater containing solids. The laboratory animal breeding facility according to any one of claims 1 to 4, wherein a sterilization filter for sterilizing and releasing the gas in the tank is attached to an upper part of the sterilization tank. A heat sterilizer for wastewater containing solids to be discharged.   6. A laboratory animal breeding facility according to any one of claims 1 to 5, wherein a heating / cooling jacket for circulating high-temperature steam or cooling water is provided on an outer periphery of the sterilization tank. A heat sterilizer for wastewater containing solids.   The inflow piping of the sewage containing the solid of the solid-liquid separator is connected to supply piping for high-temperature steam, compressed air and washing water through an open / close valve. A heat sterilization apparatus for sewage containing solid matter discharged from a laboratory animal breeding facility according to any one of the preceding claims.   Two sets of the solid-liquid separator and the sterilization tank are provided in parallel through the switching pipe provided with the switching valve, respectively, and the sewage containing the solid flows into the solid-liquid separator and from the solid-liquid separator to the solid matter The discharge of the solid substance to the storage tank and the discharge of the liquid from the sterilization tank to the liquid storage tank are performed by shifting each set of steps by switching a switching valve. A heat sterilization apparatus for sewage containing solid matter discharged from a laboratory animal breeding facility according to any one of the preceding claims.

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