JP2004024922A - Treatment method and treatment apparatus of infectious waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method and treatment apparatus of infectious waste capable of efficiently treating the infectious waste without enlarging an ozonization apparatus. <P>SOLUTION: Waste water containing the infectious waste which is discarded of from medical facilities or else is pretreated by using chlorine dioxide and, thereafter, is ozonized. The treatment apparatus of infectious waste is provided with a first treatment tank 1, a second treatment tank 2, a chlorine dioxide injector 3 which injects chlorine dioxide C as a sterilizer into the first treatment tank 1, a waste water supply device 5 which supplies the waste water D containing the infectious waste to the first treatment tank 1, a circulation device 7 which circulates the waste water D between the first and second treatment tanks 1 and 2, an ozone supply device 8 which supplies ozone into the circulating waste water and a discharge device 9 discharging the treated waste water. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a wastewater treatment method and treatment apparatus in a medical institution, and more particularly, to a wastewater treatment method and treatment apparatus for infectious waste that occurs during surgery or dissection.
[0002]
[Prior art]
Waste water generated during surgery and dissection contains blood and is likely to be contaminated with pathogens. When discharged into sewers and rivers, it must be disinfected. Appropriate treatment is defined.
The conventional recommended treatment method is a method in which wastewater is heated to 80 ° C. and sterilized by heating. However, a large-scale and expensive treatment facility is required for the treatment amount, and this is not suitable for cost. Except for large-scale medical institutions, most medical institutions are treated together with general wastewater and discharged into sewage and rivers without being fully sterilized.
[0003]
[Problems to be solved by the invention]
The reason why infectious treatment equipment is not widespread is the high cost, and a treatment equipment capable of processing at low cost is a social demand.
As a low-cost treatment method, widely used ozone treatment is promising, but a small ozone treatment apparatus cannot catch up with the treatment amount, and the treatment equipment must be enlarged.
Although treatment with various sterilizing / decomposing agents can be considered, it is necessary to increase the concentration of the sterilizing / decomposing agent in order to reliably sterilize. If it does so, the residual density | concentration of the bactericidal decomposition agent in the wastewater after a process will become high, and if it discharges to the outside as it is, the influence on an environment will be large. Depending on the concentration of the disinfectant, there is a risk of secondary contamination. Therefore, after treatment, it is necessary to neutralize the residue of the bactericidal decomposition agent with other chemicals, and as a result, extra processing equipment is required.
[0004]
The present invention has been made in response to the above-mentioned social demands. The purpose of the present invention is to provide an infectious waste that can be efficiently processed at low cost without increasing the size of the processing equipment. The object is to provide a processing method and a processing apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the infectious waste treatment method according to the present invention pretreats waste water containing infectious waste discarded from a medical institution or the like with a disinfectant and then performs ozone treatment. It is characterized by doing.
Chlorine dioxide is preferred as the disinfectant.
The pretreatment with the disinfectant is characterized by stirring for a certain time after injecting the disinfectant.
[0006]
The ozone treatment is a method in which ozone is supplied to the waste water circulating between the first and second treatment tanks, and the pretreatment with the disinfectant is performed in one of the first treatment tanks and then circulated to a predetermined level. It is characterized by performing time ozone treatment.
It is preferable to provide a temporary storage tank that accepts wastewater as needed before the first treatment tank, and transfer the fixed amount from the temporary storage tank to the first treatment tank for processing.
[0007]
The infectious waste processing apparatus of the present invention includes a first processing tank, a second processing tank, a sterilizing / disinfecting agent injection means for injecting a sterilizing / disinfecting agent into the first processing tank, and the first processing tank. Waste water supply means for supplying waste water containing infectious waste, circulation means for circulating waste water between the first treatment tank and the second treatment tank, and ozone supply means for supplying ozone into the circulating waste water And a discharge means for discharging waste water.
The disinfectant is preferably chlorine dioxide.
[0008]
It is effective to provide a stirring means for stirring the waste water in the first treatment tank into which the sterilizing / disinfecting agent is injected.
It is preferable to include a foreign matter removing means provided in the waste water supply means and a branch passage that branches from the sterilizing / disinfecting agent injecting means and injects part of the sterilizing / disinfecting agent into the foreign matter removing means.
It is preferable to include a temporary storage tank that is provided in front of the first treatment tank and receives waste water of infectious waste as needed, and a supply unit that supplies a predetermined amount of waste water from the temporary storage tank to the first treatment tank.
Moreover, you may provide the water receiving tank for receiving the wastewater provided in front of a temporary storage tank, and the supply means which supplies wastewater from this water receiving tank to the said temporary storage tank.
Furthermore, the chlorine dioxide aqueous solution may be activated by irradiating the aqueous solution of chlorine dioxide with, for example, ultraviolet rays in the pretreatment step of the sterilizing / decomposing agent. An activation means is arranged. As a method for activation, an acid such as acetic acid may be added in addition to ultraviolet irradiation.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on the illustrated embodiments.
Embodiment 1
FIG. 1 shows an infectious waste treatment apparatus according to Embodiment 1 of the present invention.
That is, this processing apparatus 10 includes a first processing tank 1, a second processing tank 2, and a chlorine dioxide injection device 3 as chlorine dioxide injection means for injecting chlorine dioxide C as a disinfectant into the first processing tank 1. And a waste water supply device 5 as waste water supply means for supplying waste water D containing infectious waste to the first treatment tank 1, and circulating the waste water D between the first treatment tank 1 and the second treatment tank 2. A circulation device 7, an ozone supply device 8 for supplying ozone into the circulating wastewater, and a discharge device 9 as a discharge means for discharging the treated wastewater are provided.
[0010]
Here, infectious waste refers to pathological waste (organs, tissues, etc.) that accompanies anatomy / surgery and blood and serum that accompanies dissection / surgery, etc. Infectious industrial wastes including plasma and body fluid (including semen) are classified into infectious industrial wastes, and infectious industrial wastes targeted by the present invention mainly correspond to infectious industrial wastes. Of course, it is not limited to the definition of laws and regulations, and can be applied to all medical wastes that need to be sterilized.
Chlorine dioxide is preferably used in the form of an aqueous solution, and in particular, stabilized chlorine dioxide obtained by stabilizing chlorine dioxide in an alkaline solution.
[0011]
In the illustrated example, the first treatment tank 1 and the second treatment tank 2 are disposed in the underground facility room 100, but the facility room 100 may be on the ground. The facility room 100 is provided with an intake facility 101 such as an air supply fan for exchanging air in the facility room 100, and an exhaust facility 102 such as an exhaust fan, and when cleaning or water leakage occurs. A drainage pump 103 is provided for draining water. This waste water is returned to the first treatment tank 1 again without being discharged outside.
The first treatment tank 1 is a sealed container, and is provided with an exhaust pipe 11 for exhausting gas stored in the first treatment tank 1 and a liquid level switch 12.
The exhaust pipe 11 is provided in the upper part of the 1st processing tank 1, and the deodorizer 13 is provided in the middle of the pipe.
[0012]
The second treatment tank 2 is a pressure vessel, and is provided with a pressure reducing valve 21 and an exhaust passage 22 for exhausting internal gas. An exhaust ozone adsorber 23 is provided in the exhaust passage 22. In addition, a pressure gauge 24 for measuring the internal pressure in the second treatment tank 2 is provided.
The chlorine dioxide injection device 3 includes a tank 31 that stores chlorine dioxide, an injection path 6 that connects the tank 31 and the first processing tank 1, and a pump 33 that sends chlorine dioxide in the tank 31 to the first processing tank 1. And. Although not shown, the line of the water supply channel 120 may be branched so that water can be supplied into the tank and the chlorine dioxide concentration can be adjusted. In that case, a stirrer that stirs chlorine dioxide in the tank 31, a liquid level meter that detects the liquid level in the tank 31, a limit switch that stops water supply when the water level reaches a predetermined amount in the tank, and the like are provided as appropriate. It is done.
[0013]
In addition, a sprinkler 14 for cleaning is disposed on the upper portion of the first treatment tank 1, and a water supply pipe 120 is connected to the sprinkler 11.
The wastewater supply device 5 includes a drainage channel 51 through which wastewater from a waste generation department such as an autopsy room flows, a drainage basin 52 as a foreign matter removing tool that receives wastewater from the drainage channel 51 and removes foreign matter, and a drainage basin 52 And a supply path 53 that communicates between the first treatment tanks 1. The position of the drainage basin 52 is higher than that of the first treatment tank 1, and the wastewater flows from the drainage basin 52 into the first treatment tank 1 by gravity.
The waste water supply device 5 is provided not only when it is directly supplied from the waste generation department from the dissection room or the like to the first treatment tank 1 but also separately provided with a temporary storage tank such as a pit so that it is temporarily stored in the storage tank. It may be.
[0014]
Further, the chlorine dioxide injection channel 6 directly connects the tank 31 and the first treatment tank 1, but a branch passage 61 is provided on the way to the drainage tank 52, and chlorine dioxide C is partially injected into the drainage tank 52. doing. Chlorine dioxide supplied to the drainage tank 52 disinfects the drainage tank 52 and is sent to the first treatment tank 1 through the supply path 53 while disinfecting the supply path 53. Therefore, the chlorine dioxide C is injected through two routes, a route directly injected from the equipment tank 31 and a route injected via the drainage basin 52, and the branch passage 61, the drainage basin 52 and the supply passage 53 are injected. Also functions as a means for injecting chlorine dioxide, which is a disinfectant.
[0015]
The circulation device 7 includes a circulation path 70 that connects the first treatment tank 1 and the second treatment tank 2, and a circulation pump 73 that is provided in the circulation path 70 and circulates waste water between the first and second treatment tanks 1 and 2. It has a configuration with. The circulation path 70 includes a transport passage 71 that connects the bottom of the first treatment tank 1 and the top of the second treatment tank 2, and a return passage 72 that connects the bottom of the second treatment tank and the top of the first treatment tank 1. It has. Two circulation pumps 73 are provided in parallel in the transport passage 71, and one is reserved. A strainer 74 and an electric on-off valve 75 for opening and closing the passage are provided on the upstream side of the circulation pump 73 in the transport passage 71.
The ozone supply device 8 includes an ozone generation device 80, an ejector 81 provided in the vicinity of the second treatment tank 2 in the transport passage 71, and an ozone supply path 82 that connects between the ozone generation device 8 and the ejector 81. The wastewater is circulated through the ejector 81.
[0016]
Further, the discharge device 9 for discharging the treated wastewater has a discharge path 91 having one end connected to the circulation path 70 via the electric first switching valve 93 and the other end released, and a discharge pump provided in the discharge path 91. 92. The discharge pump 92 discharges the waste water in the first and second treatment tanks via the circulation path 70.
An extraction passage 94 connected to an electric second switching valve 95 provided in the return passage 72 is provided at the bottom of the first treatment tank 1, and discharge from the first treatment tank 1 is performed in the extraction passage 94. , The path to the return path 72 and the discharge path 91 and the path from the first processing tank 1 through the transport path 71, the second processing tank 2 and the discharge path 91. The discharge path from the second treatment tank 1 is discharged through the return flow path 72 and the first discharge flow path 91. It may be discharged only from the transport passage 71 without going through the return passage 72, or may be discharged only from the extraction passage 94 and the return passage 72 in some cases.
A sampling passage 130 for taking out and sampling waste water is provided on the downstream side of the second switching valve 95 in the return passage 72 so as to inspect the water quality.
[0017]
The waste disposal apparatus having the above-described configuration operates as follows.
First, wastewater that has flowed from a waste generation department such as an autopsy room through a drainage channel 51 flows into a wastewater supply channel 52 through a drainage basin 52 and is supplied to the first treatment tank 1 through the wastewater supply channel 52.
On the other hand, at the same time as the wastewater flows into the first treatment tank 1, the pump 33 of the chlorine dioxide injection device 3 is driven to inject a certain amount of chlorine dioxide through the injection path 6. Most of the chlorine dioxide is directly injected into the first treatment tank 1 through the injection path 6, and a part of the chlorine dioxide is supplied from the injection path 6 through the branch passage 61 to the drainage basin 52 and from the drainage basin 52 via the supply path 53. And flows into the first treatment tank 1. Since the waste water is in contact with chlorine dioxide and flows into the first treatment tank 1 while being sterilized, the chemical liquid is well mixed with the waste water and promotes sterilization.
The chlorine dioxide may be injected only into the first treatment tank 1 without going through the drainage basin 52, or directly into the first treatment tank 1 and through the whole drainage basin 52. May be injected.
[0018]
When the amount of waste water supplied to the first treatment tank 1 reaches a predetermined amount, the supply of waste water is stopped. The amount of chlorine dioxide C to be injected is determined so that the concentration of chlorine dioxide in the first treatment tank 1 falls within a predetermined range. If the concentration is too high, the sterilizing effect is high, but the residual concentration of chlorine dioxide after treatment becomes high. Although this depends on the balance with the subsequent ozone treatment, good results were obtained with a concentration of about 5 ppm.
[0019]
When the filling of the waste water is completed, the opening / closing valve 75 of the transport path 71 is opened and the circulation pump 74 is rotationally driven to circulate the waste water between the first and second treatment tanks 1 and 2 through the transport path 71 and the return path 72. When the wastewater passes through the ejector 81, ozone is automatically sucked into the transport passage 71 and flows into the second treatment tank 2 while being supplied to the wastewater. During circulation, ozone is continuously supplied to the wastewater through the ejector 81, and the wastewater is circulated while being exposed to ozone, and sterilization and purification proceed.
After the operation for a predetermined time, waste water is taken from the sampling passage 130, the water quality is inspected, and if it falls within the inspection standard, the circulation pump 73 and the ozone generator 8 are stopped.
[0020]
In the discharge, the first and second switching valves 93 and 95 are switched and the discharge pump 93 is driven. Waste water remaining in the second treatment tank 2 is discharged through the second discharge channel 92. Waste water remaining in the first treatment tank 1 passes through two passages that are discharged through the transport passage 71 and the second treatment tank 2 and discharged through the first discharge passage 91 and the return passage 72. It is released.
The switching of the valves and the control of the pumps are automatically controlled by a control panel (not shown) provided in the electric chamber 104.
[0021]
According to the present invention, waste water can be efficiently treated by ozone treatment by sterilizing with chlorine dioxide in the pretreatment step.
If it is attempted to achieve the ozone treatment alone, it takes time for the treatment, and if it is intended to shorten the time, a large ozone generator 80 is required, resulting in an increase in cost. On the other hand, according to the present invention, the water quality within the standard could be achieved with the ozone generator 80 having a small capacity.
In addition, in the case of treating with chlorine dioxide alone, a concentration of about 20 to 30 ppm is required, and a subsequent neutralization treatment is required. It can be sterilized by ozone treatment to decompose organic matter.
Furthermore, the chlorine dioxide remaining in the pretreatment was decomposed in the ozone treatment process, and the residual concentration of chlorine dioxide could be appropriately suppressed.
In addition, you may make it irradiate with an ultraviolet-ray in the pre-processing process by chlorine dioxide C, and arrange | position the ultraviolet irradiation device as an activation means which activates the chlorine dioxide not shown in the processing system by chlorine dioxide C in that case To do.
Irradiation of ultraviolet rays has been recognized to activate chlorine dioxide, and the ultraviolet irradiation device is chlorine dioxide in the pretreatment process such as the chlorine dioxide injection path 6, the first treatment tank 1, the branch path 61 and the waste liquid supply path 53. Arranged where C exists. You may provide in one place and may provide in several places. In this case, since the effect of activation is considered to be small when the treated water is cloudy, it is preferably arranged before being mixed with the treated water such as the chlorine dioxide injection path 6 and the branch path 61.
Further, as an activating means, an acid such as acetic acid may be injected into an aqueous solution of chlorine dioxide. The injection amount is appropriately adjusted depending on the progress of the treatment.
Examples of the ultraviolet irradiation device disposed in the piping system include, for example, an apparatus main body provided with a pair of inflow / outflow ports connected to the pipe, and an ultraviolet lamp that irradiates the processing target liquid flowing into the apparatus main body from the injection port with ultraviolet rays. As long as the configuration is provided.
[0022]
Next, another embodiment of the present invention will be described.
In the following description, only different points from the above embodiment will be described, and the same components are denoted by the same reference numerals and the description thereof will be omitted.
Embodiment 2
FIG. 2 shows an infectious wastewater treatment apparatus according to Embodiment 2 of the present invention.
In this Embodiment 2, the stirrer 15 as a stirring means is provided in the 1st processing tank 1, and the waste water in the 1st processing tank 1 is stirred for the predetermined time by the pre-processing process. The stirrer 15 includes a stirring blade 15a inserted into the first processing tank, and a motor 15b that rotationally drives the stirring blade 15a.
[0023]
Then, when the filling of the waste water into the first treatment tank 1 is completed, the stirrer 15 is driven to rotate for a predetermined time, and after the stirrer 15 is stopped, the circulation pump 74 is driven to circulate the waste water. Ozone is supplied from the ozone generator 80 and sterilized with ozone.
As described above, if the agitation treatment is performed for a predetermined time in the pretreatment step using chlorine dioxide, sterilization and disinfection proceed more efficiently than in the first embodiment, and the ozone treatment time in the post-treatment can be shortened.
[0024]
Embodiment 3
FIG. 3 shows an infectious waste treatment apparatus according to Embodiment 3 of the present invention.
This embodiment is different in a waste water supply system for supplying waste water to the first treatment tank 1.
That is, in the second embodiment, infectious waste is treated with waste water from the surgical department, isolation room, and dialysis department in addition to the waste water from the dissection room. In addition, a temporary storage tank 300 is provided in front of the first treatment tank 1, waste water is temporarily stored from each waste generation department, and a predetermined amount is pumped into the first treatment tank 1 by the pumping pump 301 for processing. It is a thing. Of course, this is also applicable to cases where there is only one department that produces wastewater.
[0025]
Further, in this embodiment, the chlorine dioxide injecting device 3 can supply water into the tank 31 through the first branch line 121 from the water supply channel 120 and adjust the chlorine dioxide concentration. The tank 31 includes a stirrer 32 for stirring the chlorine dioxide in the tank 31, a liquid level gauge 34 for detecting the liquid level in the tank 31, and a limit for stopping water supply when the water level reaches a predetermined amount in the tank 31. A switch 35 is provided.
The second branch line 122 branched at the branch portion of the first branch line 121 of the water supply path 120 is connected to the chlorine dioxide injection path 6, and water supply to the first treatment tank 1 is performed through the chlorine dioxide injection path 6. Yes. The water supply to the tank 31 is controlled by an electric first opening / closing valve 121 a provided in the first branch line 121, and the water supply to the first treatment tank 1 is an electric second supplied to the second branch line 122. The chlorine dioxide injection path 6 is controlled by an electric third on-off valve 6a.
Waste water from each department is sent to the temporary storage tank 300 through the drainage passage. The drainage passage is provided with a foreign matter removing tool 352 for removing dust and foreign matters such as a drainage basin and a basket screen. Chlorine dioxide is supplied to the foreign matter removing tool 352 through the branch passage 61 from the chlorine dioxide injection passage 6. The branch passage 61 branches into three for each solid content removal tool.
The temporary storage tank 300 is provided with two pumping pumps 301 for backup, and is supplied from the pumping pump 301 to the first processing tank 1 through the pumping path 302.
On the floor to which the temporary storage tank 300 is grounded, a pump 303 for pumping up the waste water for cleaning or overflowing from the temporary storage tank 300 is set, and the waste water pumped up by the pump 303 is returned to the temporary treatment tank 300. ing.
[0026]
In the infectious waste treatment apparatus according to the second embodiment, waste water from each department is stored in the temporary storage chamber 300 as needed, and when a predetermined amount is accumulated, the waste water stored by driving the pump 301 is stored in the first treatment tank 1. Pumped up. At the same time, the pump 33 of the sterilizing / disinfecting agent injecting device 3 is driven to inject a predetermined amount of chlorine dioxide into the first treatment tank 1.
Part of the chlorine dioxide is injected into the foreign matter removing tool 352 placed at the drain outlet of each department via the branch passage 61. The injection amount into the branch passage 61 can be adjusted by opening and closing the switching valve 61 a provided in each branch passage 61.
The foreign matter removing tool 352 is sterilized and sterilized by chlorine dioxide injected through the branch passage 61, and further flows into the temporary storage tank 300 to sterilize and disinfect the waste water stored in the temporary storage tank 300. The concentration of this chlorine dioxide is diluted by the waste water that flows in as needed, and is a thin concentration, but the sterilization process proceeds to some extent in the previous stage of the first treatment tank 1.
[0027]
Since a predetermined amount of chlorine dioxide injected from the injection facility 3 is injected into the waste water pumped into the first treatment tank 1, a chlorine dioxide concentration of at least a certain concentration is ensured.
When the amount of drainage reaches a predetermined amount in the first treatment tank 1, the pumping pump 301 and the injection pump 33 are stopped, and the stirrer 15 starts to drive and stirs for a certain time.
After a certain period of time, the stirrer 15 is stopped and the process proceeds to ozone treatment.
The ozone treatment is exactly the same as in the first embodiment.
In addition, when irradiating chlorine dioxide with ultraviolet rays or activating chlorine dioxide by adding an acid such as acetic acid, the activating means such as an ultraviolet irradiation device is the chlorine dioxide injection path 6, the first treatment tank 1. In addition, the branch passage 61 and the supply path between the temporary storage tank 300 and the first treatment tank 1 may be provided at a plurality of locations.
[0028]
Embodiment 4
FIG. 4 shows an infectious waste treatment apparatus according to Embodiment 4 of the present invention.
In this processing apparatus, an individual water receiving tank 400 is provided at the intake of waste water from the waste generation department, and the individual storage tank 400 is pumped up to the temporary storage tank 300 by a pump 401. This is effective when the water receiving tank 400 is located lower than the temporary storage tank.
In this case, when the piping system becomes complicated, as shown in FIG. 5, the branch passage of chlorine dioxide is eliminated, and the foreign matter removing tool 352 may be disinfected by manually spraying chlorine dioxide.
In the said embodiment, although the example which used chlorine dioxide as a disinfection disinfectant was shown, it is not restricted to chlorine dioxide, Another disinfectant disinfectant can be used. In that case, it is preferable that the disinfectant is safe and free from problems of secondary contamination such as trihalomethane, has a high sterilizing power, and is familiar with the post-treatment ozone treatment.
[0029]
【The invention's effect】
The present invention has the above-described configuration and action, and the waste water containing infectious waste discarded from medical institutions is pretreated with a disinfectant and then treated with ozone. Most pathogens are killed or weakened by chemicals and can be treated with relatively small ozone treatment equipment. Moreover, it can decompose also about solid content.
Moreover, since the disinfectant used in the pretreatment process is decomposed by the ozone treatment, a post-treatment such as a neutralization treatment is not particularly required, and the residual concentration of the disinfectant can be kept within an appropriate range.
In particular, if chlorine dioxide is used as a disinfectant as described in claim 2, it is stable and highly effective in disinfecting, and trihalomethane is not generated unlike other chlorine-based disinfectants. Is small. In addition, chemicals such as formalin discharged can be decomposed.
[0030]
As described in claim 3, if the pretreatment with the sterilizing / disinfecting agent is stirred for a certain period of time, the sterilizing / disinfecting efficiently proceeds and the ozone treatment time can be shortened.
Further, as described in claim 4, the ozone treatment is a method of supplying ozone to waste water circulating between the first and second treatment tanks, and the pretreatment with the disinfectant is one of the first treatments. If it is performed in a treatment tank and then circulated and subjected to ozone treatment for a predetermined time, it can be treated continuously.
Furthermore, if the temporary storage tank which receives wastewater at any time is provided in front of the first treatment tank as described in claim 5 and a certain amount is transferred from the temporary storage tank to the first treatment tank for processing, Even if there is an increase, the processing can be performed stably.
[0031]
The infectious waste processing apparatus according to the present invention includes a first processing tank, a second processing tank, and a sterilizing / disinfecting agent injecting unit that injects a sterilizing / disinfecting agent into the first processing tank, as described in claim 6. , Waste water supply means for supplying waste water containing infectious waste to the first treatment tank, circulation means for circulating the waste water between the first treatment tank and the second treatment tank, and supplying ozone to the circulating waste water Since the configuration includes the ozone supply means and the discharge means for discharging the treated wastewater, the first treatment tank can be used for both the treatment with the sterilizer and the ozone treatment, and the apparatus configuration is made compact.
As described in claim 8, sterilization and disinfection can be efficiently processed by providing a stirring means for stirring the waste water in the first processing tank into which the sterilizing and disinfecting agent is injected.
[0032]
Further, as described in claim 9, foreign matter removing means provided in the waste water supply means, and a branch passage branching from the sterilizing / disinfecting agent injecting part and injecting a part of the sterilizing / disinfecting agent into the foreign matter removing means. The sterilization and disinfection of foreign matter removing means such as a drainage can be performed.
According to the invention described in claim 10, a temporary storage tank provided before the first treatment tank and receiving waste water of infectious waste as needed, and a supply for supplying a predetermined amount of waste water from the temporary storage tank to the first treatment tank Therefore, it is possible to treat appropriately regardless of the amount of drainage.
According to invention of Claim 11, since it was set as the structure provided with the water receiving tank provided in the upstream of a temporary storage tank, and the supply means which supplies wastewater from a water receiving tank to the said temporary storage tank, infectious waste This is effective when the floor of the department where the wastewater is generated is located lower than the temporary storage tank.
According to the invention described in claims 12 and 13, since chlorine dioxide is activated by irradiation of ultraviolet rays or the like in the chlorine dioxide pretreatment step, the bactericidal effect is enhanced even if the concentration of chlorine dioxide is low.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an infectious waste treatment apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a configuration diagram of an infectious waste treatment apparatus according to Embodiment 2 of the present invention.
FIG. 3 is a configuration diagram of an infectious waste treatment apparatus according to Embodiment 3 of the present invention.
FIG. 4 is a configuration diagram of an infectious waste treatment apparatus according to Embodiment 4 of the present invention.
FIG. 5 is a diagram showing a modification of the fourth embodiment of the present invention.
[Explanation of symbols]
10 Processing device
1 1st processing tank, 2nd processing tank
3 Chlorine dioxide injector
31 tanks, 32 pumps, 6 injection channels
5 Waste supply equipment
52 drainage basin, 53 supply channel
7 Circulator
70 Circulation path, 71 Transport path, 72 Return path, 73 Circulation pump, 75 Valve
8 Ozone supply device
80 Ozone generator, 81 Ejector, 82 Ozone supply path
9 Discharge device.
91 discharge passage, 92 discharge pump, 93 first discharge valve, 94 extraction passage, 95 second discharge valve
130 Sampling passage
15 Stirrer
300 Temporary storage tank
301 pump
303 pump
352 Foreign object removal tool
400 water tank
401 pump

Claims (13)

A method for treating infectious waste, characterized in that waste water containing infectious waste is pretreated with a disinfectant and then treated with ozone. The method for treating infectious waste according to claim 1, wherein the disinfectant is chlorine dioxide. The method for treating infectious waste according to claim 1 or 2, wherein the pretreatment with the disinfectant is agitated for a certain time after the disinfectant is injected. The ozone treatment is a method in which ozone is supplied to the waste water circulating between the first and second treatment tanks, and the pretreatment with the disinfectant is performed in one of the first treatment tanks and then circulated to a predetermined level. The method for treating infectious waste according to any one of claims 1 to 3, wherein a time ozone treatment is performed. The temporary storage tank which receives wastewater at any time is provided in front of the first treatment tank, and a certain amount is transferred from the temporary storage tank to the first treatment tank for processing. A method for treating infectious waste as described in 1. A first treatment tank, a second treatment tank, a sterilizing / disinfecting agent injection means for injecting a sterilizing / disinfecting agent into the first treatment tank, and a waste water supply means for supplying waste water containing infectious waste to the first treatment tank. And a circulation means for circulating the waste water between the first treatment tank and the second treatment tank, an ozone supply means for supplying ozone into the circulating waste water, and a discharge means for releasing the treated waste water. Infectious waste treatment equipment. The infectious waste treatment apparatus according to claim 6, wherein the disinfectant is chlorine dioxide. The infectious waste processing apparatus according to claim 6 or 7, further comprising stirring means for stirring the waste water in the first processing tank into which the sterilizing and disinfecting agent is injected. The foreign matter removing means provided in the waste water supply means, and a branch passage branched from the sterilizing / disinfecting agent injecting means and injecting a part of the sterilizing disinfectant into the foreign matter removing means The infectious waste disposal apparatus according to any one of the items. A temporary storage tank provided in front of the first treatment tank and receiving waste water of infectious waste as needed, and a supply means for supplying a predetermined amount of waste water from the temporary storage tank to the first treatment tank. The infectious waste disposal apparatus according to any one of items 9 to 9. The infectious waste treatment apparatus according to claim 10, further comprising: a water receiving tank provided to receive waste water before the temporary storage tank; and a supply unit that supplies waste water from the water receiving tank to the temporary storage tank. . The method for treating infectious waste according to any one of claims 2 to 5, wherein chlorine dioxide is activated in a pretreatment step of a sterilizing and decomposing agent. The infectious waste treatment apparatus according to any one of claims 7 to 11, wherein an activating means for activating chlorine dioxide is disposed in a treatment system using a bactericidal decomposition agent.

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