A method for treating medical wastewater

Abstract

The present invention relates to the technical field of medical wastewater treatment, and particularly to a method for treating medical wastewater. The method includes: S1: Pretreating the medical wastewater to remove and dispose of the broken solids in the medical wastewater; S2: Reacting the pretreated medical wastewater with fly ash to adsorb the fine particles in the medical wastewater, forming a medical wastewater solution with small particles; S3: Evaporating the medical wastewater solution to generate dried small particles; S4: Burning the dried small particles, and discharging the generated flue gas after treatment. The method for treating medical wastewater provided by this application utilizes the adsorption characteristics of fly ash. Fly ash can effectively adsorb the fine particles in the medical wastewater, forming a medical wastewater solution with several small particles. Then, the medical wastewater solution is evaporated to dry the several small particles, and then the dried small particles are burned, thereby treating the medical wastewater cleanly.

Description

Technical Field

[0001] The present invention relates to the technical field of medical wastewater treatment, and particularly to a method for treating medical wastewater. Background Art

[0002] Medical wastewater refers to the wastewater generated by medical institutions during activities such as consulting rooms, wards, laundry rooms, operating rooms, laboratories, and other related activities. The wastewater collected by hospitals still contains a large number of fine particles after preliminary pretreatment such as sedimentation tanks and secondary sedimentation tanks. These fine particles are mainly pathogenic microorganisms, toxic and harmful physicochemical pollutants, radioactive pollutants, etc., which are infectious and can induce diseases. If not properly managed and discharged randomly, allowing them to spread into the living environment of people, 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 that in the related art, medical wastewater spreads into the living environment of people, pollutes water sources, land, and animals and plants, causing the spread of diseases and seriously endangering people's health.

[0004] A method for treating medical wastewater provided by this application includes:

[0005] S1: Pretreat the medical wastewater to remove and treat the broken solids in the medical wastewater;

[0006] S2: React the pretreated medical wastewater with fly ash to adsorb the fine particles in the medical wastewater and form a medical wastewater solution with small particles;

[0007] S3: Evaporate the medical wastewater solution to generate dried small particles;

[0008] S4: Burn the dried small particles, and the generated flue gas is discharged after treatment.

[0009] In some embodiments, the step S1 specifically includes:

[0010] S11: Pour the medical wastewater into a separation storage tank to filter out the broken solids in the medical wastewater;

[0011] S12: Transport the broken solids to the coal mill of the industrial furnace kiln for pulverization, so that the pulverized broken solids enter the furnace of the industrial furnace kiln for combustion.

[0012] In some embodiments, the step S2 specifically includes:

[0013] S21: Add the fly ash into the separation storage tank to adsorb the fine particles in the medical wastewater;

[0014] S22: Let the separation storage tank stand still for a period of time to form a medical wastewater solution with small particles.

[0015] In some embodiments, in step S22, the step of letting the separation storage tank stand still for a period of time specifically includes: letting the separation storage tank stand still for 20 - 30 minutes.

[0016] In some embodiments, step S3 specifically includes:

[0017] Spray the medical wastewater into the secondary air inlet of the industrial furnace to evaporate the medical wastewater solution and generate dried small particles.

[0018] In some embodiments, in step S4, it specifically includes:

[0019] S41: Feed the dried small particles into the furnace of the industrial furnace for combustion;

[0020] S42: The flue gas discharged from combustion is discharged after being treated by the tail gas treatment system of the industrial furnace.

[0021] In some embodiments, in step S2, the fly ash surface has a porous structure, with a density of 1.9 - 2.9 g / cm3, a bulk density of 0.5 - 1.1 g / cm3, and a porosity of 60 - 75%.

[0022] In some embodiments, in step S3, the air delivery volume at the secondary air inlet is 56 - 740,000 cubic meters per hour, and the hot air temperature is greater than 330 °C.

[0023] In some embodiments, in step S3, the injection volume of the medical wastewater at the secondary air inlet is 0.5 - 1 ton per hour.

[0024] In some embodiments, in step S42, the flue gas emission temperature is 150 - 160 °C, the dust is 3 - 5 mg / Nm3, and the SO2 concentration is 15 - 20 mg / m3.

[0025] The beneficial effects of this application are as follows:

[0026] A medical wastewater treatment method provided by this application utilizes the adsorption characteristics of fly ash. After the pretreated medical wastewater reacts with fly ash, the fly ash can effectively adsorb the fine particles in the medical wastewater, separating the fine particles from the water to form a medical wastewater solution with several small particles. Then, the medical wastewater solution is evaporated to dry the several small particles, and the dried small particles are burned. The generated flue gas is treated and discharged after meeting the pollution standards, thus cleaning up the medical wastewater and avoiding the situation where the medical wastewater spills into the environment and the harmful fine particles therein pollute the environment and cause harm to the human body. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0028] Figure 1 It is a schematic diagram of the medical wastewater treatment device provided in this embodiment.

[0029] Description of the Reference Numerals in the Drawings:

[0030] 1 - Separation storage tank, 2 - Filter grille, 3 - Feeding pipe, 4 - Water pump, 5 - Industrial furnace, 6 - Secondary air inlet. Detailed Embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] The embodiment of this application provides a medical wastewater treatment device, which combines Figure 1 , including a separation storage tank 1, a water pump 4, a feeding pipe 3, and an industrial furnace 5. The medical wastewater contains broken solids such as surgical and dressing residues and disposable syringes. The separation storage tank 1 can be used to filter the broken solids in the medical wastewater, and the separation storage tank 1 can also be used as a container for the pretreated medical wastewater to react with fly ash. Preferably, the separation storage tank 1 can be made of stainless steel, and the volume of the separation storage tank 1 can be 2m 3 .

[0033] Further, one end of the feeding pipe 3 is connected to the separation storage tank 1, and the other end is connected to the secondary air inlet 6 of the industrial furnace 5. The water pump 4 is arranged on the feeding pipe 3 and is used to drive the medical wastewater in the lower cavity of the storage tank body to enter the secondary air inlet 6 of the industrial furnace 5 through the feeding pipe 3.

[0034] Furthermore, in this embodiment, the separation storage tank 1 includes a storage tank body and a filter grille 2 disposed inside the storage tank body. The filter grille 2 divides the interior of the storage tank body into a first chamber and a second chamber. Medical wastewater is poured into the first chamber. The filter grille 2 can filter out the broken solids in the medical wastewater so that the filtered medical wastewater enters the second chamber of the storage tank body. And the lower chamber is configured as a container for the reaction between the pretreated medical wastewater and fly ash. One end of the feeding pipe 3 is connected to the second chamber of the storage tank body.

[0035] Specifically, the filter grille 2 can also be made of stainless steel. The filter grille 2 includes a body with a plurality of strip-shaped filter holes formed thereon. The distance between adjacent strip-shaped filter holes is 15 - 18 mm. Thus, when the medical wastewater is poured into the separation storage tank 1, the filter grille 2 can intercept the broken small solids in the medical wastewater with side lengths greater than 15 mm. The filter holes can be cylindrical strips with a cross-sectional diameter of Ф4 - 6 mm.

[0036] Based on the same inventive concept, the embodiment of the present application also provides a medical wastewater treatment method, which is implemented based on the above medical wastewater treatment device. Combining Figure 1 , the method includes:

[0037] S1: Pretreat the medical wastewater to remove and treat the broken solids in the medical wastewater;

[0038] The broken solids are surgical residues, dressing residues, disposable syringes, etc. After pretreatment, there are still a large number of fine particles in the medical wastewater. These fine particles are solid solutes dissolved in water.

[0039] S2: React the pretreated medical wastewater with fly ash to adsorb the fine particles in the medical wastewater and form a medical wastewater solution with small particles;

[0040] Fly ash is the general term for the ash and slag discharged during the pulverized coal combustion process in coal-fired power plants. It is mainly composed of SiO2 and Al2O3, and also contains a small amount of compounds such as Fe2O3, CuO, MgO, and Na2O. It is a highly dispersed mixture of porous glass bodies, porous crystalline minerals, and porous carbon particles, with a rich pore structure and a large specific surface area. At the same time, it has many unsaturated chemical bonds and has good physical and chemical adsorption activity. Research results show that fly ash has a strong adsorption effect on organic matter in domestic sewage and has a good sewage treatment effect on low-concentration organic matter. When the water-to-ash ratio is 10, the COD removal rate in the sewage is 86%.

[0041] After fly ash is added to medical wastewater, the fly ash will adsorb the fine particles in the medical wastewater, forming small particles that are larger in volume than the fine particles and insoluble in water, thereby separating the fine particles from the water. The fly ash used in this embodiment may have a porous structure on its surface, with a density of 1.9 - 2.9 g / cm 3 , and a bulk density of 0.5 - 1.1 g / cm 3 , a porosity of 60 - 75%, and a specific surface area measured by the nitrogen adsorption method of 800 - 3500 cm 2 / g. The atomic forces on the surface are all in an unsaturated state, giving the fly ash a certain surface energy to achieve the optimal adsorption effect.

[0042] S3: Evaporate the medical wastewater solution to generate dried small particles;

[0043] The small particles formed by the adsorption of fly ash are insoluble in water. Therefore, when the medical wastewater solution is evaporated, the small particles will be dried.

[0044] S4: Burn the dried small particles, and the generated flue gas is discharged after being treated.

[0045] The flue gas generated by the combustion of the small particles is treated and discharged after meeting the pollution standards, thus avoiding air pollution and ensuring the environmental protection of medical wastewater treatment.

[0046] Furthermore, step S1 specifically includes:

[0047] S11: Pour the medical wastewater into the separation storage tank 1 to filter out the broken solids in the medical wastewater;

[0048] The medical wastewater can be transported to the site by a sealed tanker truck. Using the height of the sealed tanker truck itself, the medical wastewater is sent to the separation storage tank 1 by gravity. The broken solids with side lengths greater than 15 - 18 mm in the medical wastewater will be intercepted by the filter grille 2 in the separation storage tank 1.

[0049] S12: Transport the broken solids to the coal mill of the industrial furnace 5 for pulverization so that the pulverized broken solids enter the furnace of the industrial furnace 5 for combustion.

[0050] Specifically, after the broken solids are collected, they are sent to the front conveyor belt of the coal mill, mixed with blended coal and enter the coal mill for pulverization, and then enter the furnace of the industrial furnace 5 for combustion.

[0051] Furthermore, step S2 specifically includes:

[0052] S21: Add fly ash to the separation storage tank 1 to adsorb the fine particles in the medical wastewater;

[0053] In step S12, the crushed solid is intercepted by the filtration grille 2, and the remaining medical wastewater containing fine particles remains in the separation storage tank 1. Fly ash is added to the separation storage tank 1 to adsorb the fine particles in the medical wastewater.

[0054] S22: Let the separation storage tank 1 stand still for a period of time to form a medical wastewater solution with small particles.

[0055] Letting the separation storage tank 1 stand still for a period of time can fully separate the solid and water. Preferably, the separation storage tank 1 can stand still for 20 - 30 minutes.

[0056] Further, step S3 specifically includes:

[0057] Spray the medical wastewater into the secondary air inlet 6 of the industrial furnace 5 to evaporate the medical wastewater solution and generate dried small particles.

[0058] The medical wastewater can enter the secondary air inlet 6 of the industrial furnace 5 through the feeding pipe 3 and the water pump 4. The solid waste pretreated with fly ash is extremely easy to separate from water. After entering the secondary air inlet 6 of the industrial furnace 5, it forms a mist under the action of high temperature and high pressure, and the water is quickly evaporated and then enters the furnace for combustion. Since the medical wastewater directly enters the secondary air inlet 6, the small particles therein enter the furnace for combustion, the water is evaporated, and the volatilized gas enters the furnace without escaping into the environment, and the medical wastewater is thoroughly, safely and environmentally treated.

[0059] Through on-site analysis of the furnace combustion flame and flue gas emission components, when the injection volume of the medical wastewater is 0.5 - 1 ton / hour, the flame length of the system combustion and the flue gas emission can both meet the production requirements. At this injection volume of the medical wastewater, the air supply volume at the secondary air inlet 6 is 56 - 740,000 cubic meters / hour, and when the hot air temperature is greater than 330 °C, the heat required for the evaporation of the medical wastewater can be satisfied, thus meeting the requirements of production operation.

[0060] It should be noted that without fly ash pretreatment, the fine particles in the medical wastewater are likely to follow the airflow to the exhaust system after drying in the furnace, increasing the dust in the exhaust system, thus increasing the difficulty of meeting the flue gas emission standards. After adding fly ash to adsorb the fine particles, small particles with a larger volume than the fine particles can be formed, so it is not easy to follow the airflow to the exhaust system and can directly enter the furnace for combustion to form ash after drying.

[0061] Further, in step S4, it specifically includes:

[0062] S41: Send the dried small particles into the furnace of the industrial furnace 5 for combustion;

[0063] S42: The flue gas emitted from combustion is discharged after being treated by the tail gas treatment system of the industrial furnace 5.

[0064] The discharge temperature of the flue gas treated by the tail gas treatment system of the industrial furnace 5 is 150 - 160 °C, and the dust content is 3 - 5 mg / Nm 3 , and the SO2 concentration is 15 - 20 mg / m 3 , showing no obvious change compared with that before co - firing and meeting the emission standards.

[0065] Compared with the prior art, the present invention has the following positive effects:

[0066] 1) The present invention uses fly ash to adsorb fine particles in medical wastewater, increasing the mass and volume of the fine particles, so that when the medical wastewater is sprayed into the secondary air inlet 6, the solid can be easily separated from the water and enter the furnace for combustion, avoiding the fine particles in the medical wastewater from drying in the furnace and then flowing into the smoke exhaust system with the air flow, increasing the dust in the smoke exhaust system, and improving the combustibility and treatment efficiency of the medical wastewater.

[0067] 2) The present invention uses the heat of the secondary air inlet 6 of the industrial furnace 5 to dry the water contained in the small particles formed by the adsorption of fly ash, and uses the furnace burner to burn the dried small particles, thereby treating the fine particles in the medical wastewater. That is, it directly uses the existing industrial furnace 5 to treat the medical wastewater, so there is no need to specially build facilities for treating medical wastewater, no new land is occupied, and the floor area and technical cost can be saved.

[0068] 3) The present invention uses the tail gas treatment system of the industrial furnace 5 to treat the flue gas generated by the combustion in the furnace, so that the pollutants are discharged up to standard, which is safe and environmentally friendly.

[0069] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0070] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A method for treating medical wastewater, characterized in that, The method includes: S1: Pretreat the medical wastewater to remove and dispose of the broken solids in the medical wastewater; S2: React the pretreated medical wastewater with fly ash to adsorb the fine particles in the medical wastewater and form a medical wastewater solution with small particles; S3: Evaporate the medical wastewater solution to generate dried small particles; S4: Burn the dried small particles, and the generated flue gas is discharged after being treated.

2. The medical wastewater treatment method according to claim 1, characterized in that, The specific steps of step S1 include: S11: Pour the medical wastewater into a separation storage tank to filter out the broken solids in the medical wastewater; S12: Transport the broken solids to the coal mill of the industrial furnace for pulverization so that the pulverized broken solids enter the furnace of the industrial furnace for combustion.

3. The medical wastewater treatment method according to claim 2, characterized in that, The specific steps of step S2 include: S21: Add the fly ash into the separation storage tank to adsorb the fine particles in the medical wastewater; S22: Let the separation storage tank stand for a period of time to form a medical wastewater solution with small particles.

4. The medical wastewater treatment method according to claim 3, wherein In step S22, the step of letting the separation storage tank stand for a period of time specifically includes: letting the separation storage tank stand for 20 - 30 minutes.

5. The medical wastewater treatment method according to claim 3, wherein, The specific steps of step S3 include: Spray the medical wastewater into the secondary air inlet of the industrial furnace to evaporate the medical wastewater solution and generate dried small particles.

6. The medical wastewater treatment method according to claim 5, characterized in that, In step S4, it specifically includes: S41: Send the dried small particles into the furnace of the industrial furnace for combustion; S42: The flue gas discharged from combustion is discharged after being treated by the tail gas treatment system of the industrial furnace.

7. The medical wastewater treatment method according to claim 1, characterized in that, In the step S2, the surface of the fly ash is porous, with a density of 1.9 - 2.9 g / cm 3 , and a bulk density of 0.5 - 1.1 g / cm 3 , and a porosity of 60 - 75%.

8. The medical wastewater treatment method according to claim 5, wherein, In step S3, the air supply volume at the secondary air inlet is 560,000 - 740,000 cubic meters per hour, and the hot air temperature is greater than 330 °C.

9. The medical wastewater treatment method according to claim 5, characterized in that, In step S3, the injection volume of the medical wastewater at the secondary air inlet is 0.5 - 1 ton per hour.

10. The medical wastewater treatment method according to claim 6, wherein, In the step S42, the emission temperature of the flue gas is 150 - 160 °C, the dust content is 3 - 5 mg / Nm 3 , and the SO2 concentration is 15 - 20 mg / m 3 .

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