JPS588304B2 - How to dispose of waste from hospitals and research institutions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method of treating waste from hospitals and research institutions.

More particularly, it relates to methods for disposing of seed waste from hospitals and research institutions that use animals as experimental materials.

Tissue fragments from instruments, etc. generated during surgery and dissection of humans and animals, gauze with blood and mucus on them, absorbent cotton, bandages, oiled paper, etc., and corpses of laboratory animals, etc., are unhygienic and rotten if left unattended. It is easy to generate unpleasant odors.

Conventionally, such waste is collected by a disposal company and incinerated at a crematorium or the like.

However, it often takes a certain amount of time, for example, several days, from the time the waste is generated until it is picked up by a trader.

Therefore, hospitals and research institutions that generate a large amount of waste need storage space until it can be picked up by a contractor, while conversely, if only a small amount of waste is generated, it is especially necessary to store it before it can be picked up by a contractor. There was a problem that it took a long time.

Furthermore, because waste is generated irregularly, the period of time before it is picked up by a contractor is variable, and in some cases it is left unattended for a long period of time.

Furthermore, it is often dangerous to leave the carcasses of experimental animals that have been given poisons and/or drugs or infected with pathogens before incineration.

It has also been mistakenly used as a raw material for feed, etc.

In this case, the potential danger to humans was enormous.

According to the method of the present invention, the above-mentioned waste is put into directly heated oil at a temperature of 140°C to 260°C and immersed, if necessary, under reduced pressure conditions, and the waste is evaporated while water is evaporated. The water content of the treated product can be reduced to about 7% or less by dehydration treatment by replacing the water content with oil.

Alternatively, the surface of the treated product may be carbonized by immersing the obtained dehydrated product in oil at an oil temperature of 230° C. or higher.

In either case, the treated material after being treated with oil may be immediately incinerated, or it may be taken over by a contractor and incinerated.

In any case, if the oil is treated by the method of the present invention, it cannot be reused in any form, let alone as a raw material for feed, and the risk of erroneous reuse is completely eliminated.

According to the method of the present invention, even a small amount of waste can be treated immediately after generation regardless of the amount and time of generation, so it is very hygienic and does not take up much space.

Even if the oil is stored for a certain period of time without being incinerated immediately after oil treatment, the space is small because the volume is significantly reduced.
It also has the advantage of being sterilized by heating and being dehydrated, making it less susceptible to spoilage.

Also, during oil treatment, odor treatment is performed by evacuation under reduced pressure, so no abnormal odor is generated.

Furthermore, since the water has already been dehydrated before incineration, incineration is easy, and contaminated oil can also be incinerated at the same time.

Oil treatment according to the method of the present invention is usually carried out at temperatures between 140°C and 230°C.
C. for 15 minutes to 30 minutes, preferably 180.degree. C. to 225.degree. C. for 20 minutes to 25 minutes.

The temperature of the oil during carbonization is between 230°C and 26°C.
Treatment is carried out at 0°C, preferably 230°C to 250°C, for 5 to 10 minutes.

A device such as a thermostat can be used to maintain the oil temperature, and the oil is directly heated.

Normally, the water content in the waste is reduced to 65% by the first stage of oil treatment.
% to 85% to approximately 4% to 8%.

If the holding time is longer than the above range, the water content will further decrease, but there is no particular advantage.

After use, oil is eluted from tissue pieces, etc., and blood, mucus, etc. are suspended in the oil after use.

Such oil can be used again by filtration.

The oil used in the method of the invention is simply a heating medium and any animal or vegetable oil can be used alone or in mixtures.

Examples of animal oils include lard, head and fish oils, and examples of vegetable oils include salad oil, soybean oil, rapeseed oil and palm oil.

The reduced pressure conditions suitable for implementing the method of the present invention are 50% lower than normal pressure.
mmAq to 250mmAq, preferably 100mm
The pressure condition is Aq to 200 mmAq lower.

A vacuum is created using any device such as a vacuum pump, water ejector, etc.

The invention is further illustrated by the following examples.

Example 1. 5 liters of oil heated to 160℃ from 1,100 g of rat carcass
The mixture was placed in an oil bath for 50 minutes while being maintained at 150°C to 160°C under reduced pressure conditions that were 100 mmAq lower than normal pressure.

The moisture content decreased from 68% to 7%. Example 2. 900 g of a pig's large intestine and 800 g of liver fragments were placed in 5 liters of oil heated to 140°C, and kept at 140° to 150°C under reduced pressure conditions of 150 mmAq lower than normal pressure for 70 minutes in an oil bath.

The moisture content decreased from 78% to 8%.

Example 3. 1000g of pork slices and 1000g of large intestine pieces at 170℃
into 5 liters of oil heated to 200 mmA above normal pressure.
The mixture was kept in an oil bath for 20 minutes at 170°C to 180°C under reduced pressure.

The moisture content decreased from 80% to 8%.

Example 4. Chicken pieces 3 cm thick and 5 cm square with a moisture content of 78% were dehydrated and carbonized under normal pressure.

Oil bath time Oil temperature Moisture content Notes (minutes) (℃) (%) 10 180 3.7 Internal white 15 220 2.3 Surface dark brown 20 2
50 1.4 Dark brown inside 30 260 0
．． 67 Overall Carbonization Example 5 Chicken giblet bone-in meat with a moisture content of 68% was dehydrated and carbonized under normal pressure.

Oil bath time Oil temperature Moisture content Notes (min) (℃) (%) 15 190 1.5

Claims (1)

[Claims] 1. A method for treating waste from hospitals and research institutions, in which the waste is thrown into oil heated to a temperature of 140°C to 260°C, immersed, and disposed of while evaporating water due to the temperature of the oil. A method characterized by dehydrating a substance by replacing water in it with oil. 2. The method according to claim 1, wherein the dehydration treatment is performed under reduced pressure conditions. 3 In a method for treating waste from hospitals and research institutes, waste is placed in oil heated to a temperature of 140°C to 220°C, immersed in it, and the water is evaporated by the oil temperature, converting the water in the waste into oil. A method characterized by dehydrating the product by replacing it with water, and then carbonizing the treated product by placing it in an oil bath at an oil temperature of 230° C. or higher. 4. The method according to claim 3, wherein the dehydration treatment is performed under reduced pressure conditions.