A medical wastewater treatment method

Abstract

The present application relates to the technical field of medical wastewater treatment, and particularly relates to a medical wastewater treatment method.The method comprises the following steps: S1: injecting medical wastewater into a storage tank, and performing steam stirring on the medical wastewater, wherein the pressure of the steam is 0.3-0.5 MPa, and the temperature of the steam is 150-200 DEG C; S2: spraying the medical wastewater solution into a high-temperature inlet of a combustion device to perform evaporation, and generating dry solid waste powder; S3: the dry solid waste powder enters a combustion part of the combustion device to perform combustion, and the generated flue gas is discharged after treatment.The medical wastewater treatment method provided by the present application can ensure that solid particles can also be fully sprayed into the high-temperature inlet for treatment by first stirring the medical wastewater and then injecting the medical wastewater into the high-temperature inlet of the combustion device; after the medical wastewater enters the high-temperature inlet, dry solid waste powder is generated, the dry solid waste powder enters the combustion part of the combustion device to perform combustion, and the generated flue gas is discharged after treatment, so that the medical wastewater is treated completely.

Description

Technical Field

[0001] This invention relates to the field of medical wastewater treatment technology, and more particularly to a method for treating medical wastewater. Background Technology

[0002] Medical wastewater refers to the wastewater generated by medical institutions in their examination rooms, wards, laundry rooms, operating rooms, laboratories, and other related activities. Even after preliminary pretreatment such as sedimentation tanks and secondary sedimentation tanks, the wastewater collected by hospitals still contains a large number of fine particles. These fine particles mainly consist of pathogenic microorganisms, toxic and harmful physicochemical pollutants, and radioactive pollutants, which are infectious and can induce diseases. If not properly managed and discharged indiscriminately, allowing it to spread into people's living environment, it will pollute water sources, land, and animals and plants, causing the spread of diseases and seriously endangering people's health. Summary of the Invention

[0003] This application provides a method for treating medical wastewater, which solves the technical problem in related technologies where medical wastewater flows into people's living environment, pollutes water sources, land, and animals and plants, causing the spread of diseases and seriously endangering people's health.

[0004] This application provides a method for treating medical wastewater, comprising:

[0005] S1: The medical wastewater is injected into a storage tank and the medical wastewater is stirred with steam. The steam pressure is 0.3-0.5 MPa and the temperature is 150-200℃.

[0006] S2: The medical wastewater solution is sprayed into the high-temperature inlet of the combustion equipment for evaporation to generate dried solid waste powder;

[0007] S3: The dried solid waste powder enters the combustion section of the combustion equipment for combustion, and the generated flue gas is discharged after treatment.

[0008] In some embodiments, the bottom of the storage tank is equipped with a steam agitator, which can agitate the medical wastewater.

[0009] In some embodiments, the storage tank is connected to a feed pipe, which is equipped with a booster pump, and the other end of the feed pipe is connected to the high-temperature inlet of the combustion equipment.

[0010] In some embodiments, the combustion device is an industrial furnace.

[0011] In some embodiments, the high-temperature inlet is the coal mill inlet of the industrial furnace.

[0012] In some embodiments, the output of the coal mill is 50-60 tons / hour.

[0013] In some embodiments, the temperature at the inlet of the coal mill is above 300°C.

[0014] In some embodiments, in step S3, the injection rate of medical wastewater at the inlet of the coal mill is 2 to 3 tons per hour.

[0015] In some implementations, step S4 specifically includes:

[0016] The dried solid waste powder enters the furnace of the industrial furnace for combustion, and the flue gas emitted from the combustion is treated by the tail gas treatment system of the industrial furnace before being discharged.

[0017] In some embodiments, in step S4, the emission temperature of the flue gas is 130–160°C, and the dust concentration is 4–5 mg / Nm³. 3 SO2 concentration is 18-23 mg / m³ 3 .

[0018] The beneficial effects of this application are as follows:

[0019] This application provides a method for treating medical wastewater. First, the medical wastewater is steam-stirred to ensure uniform distribution of solid particles. Then, the wastewater is injected into the high-temperature inlet of a combustion device. This ensures that solid particles are fully injected into the high-temperature inlet for treatment, preventing them from settling at the bottom of the storage tank. After entering the high-temperature inlet, the medical wastewater rapidly evaporates under high temperature, generating dried solid waste powder. This dried solid waste powder enters the combustion section of the combustion device for combustion. The generated flue gas is treated to meet standards before being discharged, thus cleaning the medical wastewater and preventing it from flowing into the environment and causing pollution from harmful fine particles, which could harm human health. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0021] Figure 1 This is a schematic diagram of the medical wastewater treatment device provided in this embodiment.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Storage tank, 2-Feeding pipe, 3-Booster pump, 4-Coal mill, 41-Coal mill inlet, 5-Furnace burner, 6-Steam stirring device. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Combination Figure 1 This application provides a method for treating medical wastewater. The medical wastewater in this embodiment is wastewater that has undergone pretreatment at a hospital. During the pretreatment process, feces, discarded masks, and other waste materials in the medical wastewater have been removed. This treatment method is applicable to all liquid or semi-liquid medical wastewater. Specifically, the medical wastewater in this embodiment has a density of 1.002–1.006 kg / L, a pH of 7–8, a water content of 85–95%, and good fluidity. The method includes:

[0026] S1: Inject the medical wastewater into storage tank 1 and agitate it with steam at a pressure of 0.3-0.5 MPa and a temperature of 150-200℃.

[0027] Medical wastewater can be transported to the site in a sealed tanker truck and pumped into storage tank 1 using an on-board pump. Storage tank 1 can be made of stainless steel and has a volume of 2m³. 3 The dimensions are 2m × 1m × 1m. After the medical wastewater is injected into the storage tank 1, the solid particles will settle to the bottom of the storage tank 1 under the action of gravity. Over time, they will clump together, affecting the volume of the storage tank 1 and preventing the solid particles from entering the subsequent equipment for processing. Therefore, the medical wastewater needs to be stirred to ensure that the solid particles in the medical wastewater are evenly distributed. Since the steam temperature is high, it can further kill the residual microorganisms in the medical wastewater while stirring. Therefore, steam is used to stir the medical wastewater in this embodiment.

[0028] Specifically, a steam stirring device 6 is installed at the bottom of the storage tank 1. The steam stirring device 6 has a steam main pipe and steam branch pipes for conveying steam. The outlet of the steam branch pipe is equipped with a nozzle, which is used to evenly distribute the flow rate. The nozzle is horizontally arranged at the bottom of the storage tank 1. The steam branch pipe is made of 20G material, has a diameter of DN50mm, and the nozzle orifice diameter is 4mm. After the steam is turned on, the medical wastewater absorbs heat and its temperature rises under the action of the steam jet. The fine solid particles at the bottom expand in volume and flow upward under the action of density difference, thereby avoiding the natural deposition of fine solid particles in the medical wastewater under the action of gravity. At the same time, during stirring, the medical wastewater in the storage tank 1 rotates in the same direction, preventing natural deposition at the corners of the storage tank 1 due to low flow velocity.

[0029] S2: The medical wastewater solution is sprayed into the high-temperature inlet of the combustion equipment for evaporation, generating dried solid waste powder.

[0030] The storage tank 1 is connected to a feed pipe 2, which is equipped with a booster pump 3. The other end of the feed pipe 2 is connected to the high-temperature inlet of the combustion equipment. Activating the booster pump 3 pressurizes the steam-heated mixed medical wastewater to 0.1–0.2 MPa and delivers it to the feed pipe 2, then injects it into the high-temperature inlet of the combustion equipment. Since the medical wastewater is first stirred in step S1 to ensure uniform distribution of solid particles before being injected into the high-temperature inlet, this prevents solid particles from settling at the bottom of the storage tank 1, ensuring that the solid particles are fully injected into the high-temperature inlet for treatment.

[0031] In this embodiment, the combustion equipment can be an industrial furnace, which is a thermal device used in industrial production to heat materials or workpieces using heat from fuel combustion or electrical energy conversion. The industrial furnace includes a coal mill 4. The high-temperature inlet of the industrial furnace can be either the coal mill inlet 41 or the secondary air outlet. Both the coal mill inlet 41 and the secondary air outlet produce high-temperature gas, which can rapidly evaporate the medical wastewater solution. Preferably, in this embodiment, the high-temperature inlet of the combustion equipment is the coal mill inlet 41, with a temperature above 300°C. The injection rate of medical wastewater at the coal mill inlet 41 is 2-3 tons / hour, and the output of the coal mill 4 is 50-60 tons / hour.

[0032] S3: The dried solid waste powder enters the combustion section of the combustion equipment for combustion, and the generated flue gas is discharged after treatment.

[0033] The combustion section of the industrial furnace is the furnace burner 5. Medical wastewater is injected into the coal drop pipe at the inlet 41 of the coal mill. The moisture contained therein is quickly evaporated by the hot air at the inlet 41 of the coal mill. The resulting solid waste powder is mixed with the coal falling from above the coal drop pipe to form coal powder, which is then sprayed into the furnace burner 5 for combustion. The volatile gases enter the negative pressure coal mill 4 and are discharged after being treated by the tail gas treatment system of the industrial furnace to meet the standards, without affecting the environment.

[0034] Specifically, in this embodiment, the emission temperature of the flue gas is 130–160°C, and the dust concentration is 4–5 mg / Nm³. 3 SO2 concentration is 18-23 mg / m³ 3 It meets emission standards.

[0035] Compared with the prior art, the present invention has the following positive effects:

[0036] 1) The present invention first stirs the medical wastewater to make the solid particles in the medical wastewater evenly distributed, and then injects the medical wastewater into the high-temperature inlet of the combustion equipment. In this way, it can be ensured that the solid particles can also be fully sprayed into the high-temperature inlet for treatment, and the solid particles are avoided from settling at the bottom of the storage tank 1.

[0037] 2) This invention utilizes the temperature of the hot return air at the inlet 41 of the coal mill to rapidly dry the steam-heated medical wastewater, avoiding secondary pollution and odor from the medical wastewater. The dried solid waste powder is then burned using the furnace burner 5, thereby completely eliminating the bacteria and viruses carried in the medical wastewater. In other words, the existing industrial furnace is used to treat the medical wastewater directly, eliminating the need to build special facilities for treating medical wastewater, saving land area and technical costs, and thus having good economic and social benefits.

[0038] 3) This invention utilizes the exhaust gas treatment system of industrial furnaces and kilns to treat the flue gas from combustion in the furnace, ensuring that pollutants are discharged only after meeting emission standards, thus ensuring safety and environmental protection.

[0039] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0040] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for treating medical wastewater, characterized in that, The method includes: S1: The medical wastewater is injected into a storage tank. The bottom of the storage tank is equipped with a steam stirring device. The steam stirring device stirs the medical wastewater with steam to make the solid particles in the medical wastewater evenly distributed. The steam pressure is 0.3~0.5MPa and the temperature is 150~200℃. S2: The stirred medical wastewater is sprayed into the high-temperature inlet of the combustion equipment for evaporation to generate dried solid waste powder; S3: The dried solid waste powder enters the combustion section of the combustion equipment for combustion, and the generated flue gas is discharged after treatment.

2. The medical wastewater treatment method as described in claim 1, characterized in that, The storage tank is connected to a feeding pipe, which is equipped with a booster pump. The other end of the feeding pipe is connected to the high-temperature inlet of the combustion equipment.

3. The medical wastewater treatment method as described in claim 1, characterized in that, The combustion equipment is an industrial furnace.

4. The medical wastewater treatment method as described in claim 3, characterized in that, The high-temperature inlet is the coal mill inlet of the industrial furnace.

5. The medical wastewater treatment method as described in claim 4, characterized in that, The output of the coal mill is 50-60 tons / hour.

6. The medical wastewater treatment method as described in claim 4, characterized in that, The temperature at the inlet of the coal mill is above 300°C.

7. The medical wastewater treatment method as described in claim 4, characterized in that, In step S3, the injection rate of medical wastewater at the inlet of the coal mill is 2-3 tons / hour.

8. The medical wastewater treatment method as described in claim 3, characterized in that, Step S3 specifically includes: The dried solid waste powder enters the furnace of the industrial furnace for combustion, and the flue gas emitted from the combustion is treated by the tail gas treatment system of the industrial furnace before being discharged.

9. The medical wastewater treatment method as described in claim 8, characterized in that, In step S3, the emission temperature of the flue gas is 130~160℃, and the dust concentration is 4~5 mg / Nm³. 3 SO2 concentration is 18~23 mg / m³ 3 .

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