Medical waste matching sewage treatment system

Abstract

The utility model discloses medical waste is matched with sewage treatment system, relates to sewage treatment technical field, including: the organic matter, pathogen and suspended solid of the domestic wastewater and domestic sewage of the treatment incineration plant daily generation's production domestic sewage treatment system, the suspended solid and pollutant of early rainwater treatment system of removal rainwater, early rainwater treatment system supplements the backwater consumption of production domestic sewage treatment system, the high salt high heavy metal wastewater is handled, realizes the desulfurization wastewater treatment system of desulfurization recycling, PLC full -automatic control system, PLC full -automatic control system respectively with production domestic sewage treatment system, early rainwater treatment system and desulfurization wastewater treatment system electric connection, the utility model discloses to the different water quality of production domestic sewage, early rainwater, desulfurization wastewater, can stable processing component complex incineration wastewater, adapts the large -scale wastewater treatment demand of centralized incineration plant.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a wastewater treatment system for medical waste. Background Technology

[0002] Medical waste, as a highly hazardous waste containing large amounts of viruses, bacteria, and heavy metals, is currently treated using high-temperature limonene treatment both domestically and internationally. However, the treatment of medical waste in most cities is characterized by decentralization: large-scale hospitals use simple small incinerators for self-treatment, while smaller hospitals mix medical waste with household garbage. This model directly leads to frequent problems in the treatment of highly polluting wastewater containing viruses, bacteria, and heavy metals generated during medical waste incineration. The existing decentralized wastewater treatment methods suffer from three core issues: Secondary pollution is serious: decentralized treatment facilities are rudimentary and lack unified supervision, making it easy for pollutants to spread to the surrounding environment, threatening human health and ecological security; Insufficient resource utilization: The treated water is not fully reused, requiring a continuous replenishment of new water sources, which significantly increases the operating costs of the incineration plant; Poor adaptability: The wastewater generated from medical waste incineration is complex, encompassing industrial wastewater, initial rainwater, and desulfurization wastewater. A single treatment process cannot simultaneously meet the treatment requirements of different water qualities. Further analysis of the shortcomings of existing technologies reveals that they cannot meet the operational needs of centralized incineration plants: firstly, the processing scale is small and the cost is high, making it difficult to cope with the large amount of wastewater generated by centralized incineration; secondly, the reuse rate is low, and a closed-loop wastewater recycling system has not been formed, resulting in serious resource waste; and thirdly, the degree of automation is low, relying on manual operation, and the equipment failure response is slow, which can easily cause the processing process to be interrupted. Utility Model Content

[0003] The purpose of this invention is to provide a wastewater treatment system for medical waste, which can achieve classified treatment, efficient reuse, and automatic operation of wastewater treatment, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a wastewater treatment system for medical waste, comprising: a production and domestic wastewater treatment system for treating organic matter, pathogens and suspended solids in domestic wastewater and sewage generated daily by incineration plants; An initial rainwater treatment system for removing suspended solids and pollutants from rainwater, wherein the initial rainwater treatment system supplements the return water volume of the production and domestic sewage treatment system; A desulfurization wastewater treatment system that treats high-salt and high-heavy-metal wastewater and enables desulfurization recycling; The PLC fully automatic control system is electrically connected to the production and domestic sewage treatment system, the initial rainwater treatment system, and the desulfurization wastewater treatment system.

[0005] Preferably, the production and domestic wastewater treatment system includes, in sequence, a fine screen well, a pre-aeration regulating tank, an A / O biochemical treatment unit, a sedimentation tank, a multi-media filter, and a dosing and disinfection unit for connecting the quench water tank, urea preparation tank, and irrigation pipeline for the plant's green areas to the incineration system.

[0006] Preferably, the pre-aeration regulating tank is equipped with an aerator and a liquid level monitoring controller, and the liquid level monitoring controller is electrically connected to a first lift pump, the outlet of the first lift pump being connected to the interior of the pre-aeration regulating tank.

[0007] Preferably, the A / O biochemical treatment unit includes an anoxic tank and a contact oxidation tank. The contact oxidation tank is equipped with a nitrification liquid return pump, and the outlet of the nitrification liquid return pump is connected to the interior of the anoxic tank.

[0008] Preferably, a sludge discharge device is provided at the bottom of the sedimentation tank, and one end of the sludge discharge device is connected to a sludge storage tank for connecting to a sludge dewatering system.

[0009] Preferably, the initial rainwater treatment system includes an initial rainwater tank, a second booster pump, an integrated water purifier, and a filter unit connected in sequence. The outlet of the filter unit and the outlet of the chemical dosing and disinfection unit are connected together to the quench water tank, urea preparation tank, and irrigation pipeline for greening in the incineration system.

[0010] Preferably, the desulfurization wastewater treatment system includes an advanced oxidation reaction unit, a flocculation sedimentation tank, and a plate and frame filter press connected in sequence to the desulfurization circulating alkali tank in the incineration system.

[0011] Preferably, the advanced oxidation reaction unit includes an oxidation reaction tank and a chemical reaction tank, which together form a quadruple reaction tank. The quadruple reaction tank is provided with multiple reaction zones for sequentially adding a strong oxidant, ferrous sulfate and PAC.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model effectively removes organic matter, pathogens and suspended solids from domestic and industrial wastewater through fine screen filtration, A / O biochemical degradation and chemical disinfection; desulfurization wastewater achieves separation of heavy metals and pollutants through advanced oxidation and pressure filtration; sludge is rendered harmless through incineration, with no pollutants discharged externally, thus completely solving the pollution diffusion problem of traditional decentralized treatment.

[0013] 2. This utility model integrates the treatment and filtration of initial rainwater, preventing the direct discharge of surface pollutants carried during the initial stage of heavy rain, protecting the surrounding water environment, and meeting the environmental compliance requirements of incineration plants.

[0014] 3. This utility model designs a customized system for different water qualities such as domestic and industrial sewage, initial rainwater and desulfurization wastewater, avoiding the limitations of a single process and a one-size-fits-all approach. It can stably treat incineration wastewater with complex composition and is suitable for the large-scale wastewater treatment needs of centralized incineration plants.

[0015] 4. This utility model uses a PLC system to monitor the liquid level and flow rate in real time, and automatically controls the wastewater classification and diversion, chemical dosage adjustment and equipment start-up and shutdown, so as to achieve unattended operation and reduce manual operation costs and management intensity. Attached Figure Description

[0016] Figure 1 This is a system block diagram of the present invention.

[0017] In the diagram: 1. Bar screen well; 2. Pre-aeration and equalization tank; 3. Anoxic tank; 4. Contact oxidation tank; 5. Sedimentation tank; 6. Sludge dewatering system; 7. Sludge storage tank; 8. Multi-media filter; 9. Initial rainwater tank; 10. Integrated water purifier; 11. Reclaimed water tank; 12. Oxidation reaction tank; 13. Chemical reaction tank; 14. Flocculation sedimentation tank; 15. Plate and frame filter press. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1 This utility model provides a technical solution: a wastewater treatment system for medical waste, comprising a domestic and industrial wastewater treatment system, an initial rainwater treatment system, a desulfurization wastewater treatment system, and a PLC fully automatic control system. The domestic and industrial wastewater treatment system treats organic matter, pathogens, and suspended solids in the domestic wastewater and sewage generated daily by the incineration plant; the initial rainwater treatment system removes suspended solids and pollutants from rainwater and replenishes the return water volume of the domestic and industrial wastewater treatment system; the desulfurization wastewater treatment system treats high-salt and high-heavy-metal wastewater, achieving desulfurization recycling; the PLC fully automatic control system is electrically connected to the domestic and industrial wastewater treatment system, the initial rainwater treatment system, and the desulfurization wastewater treatment system, respectively. The PLC fully automatic control system is electrically connected to the pumps, valves, flow meters, level gauges, and dosing devices of the three systems, respectively, and is used to control the wastewater classification into the corresponding subsystems, adjust equipment operating parameters, and switch fault alarms.

[0020] During treatment, the PLC fully automatic control system automatically switches valves according to the type of wastewater, such as domestic and industrial sewage, initial rainwater, and desulfurization wastewater, and directs the wastewater to the corresponding subsystem to avoid the mixing of different water qualities from affecting the treatment effect. Customized processes are designed for different water quality characteristics, such as biochemical treatment to degrade organic matter and advanced oxidation to remove heavy metals. After treatment, the water is reused in a targeted manner according to its intended use. The PLC fully automatic control system monitors the liquid level (such as the level in the equalization tank), flow rate, and water quality parameters in real time, and automatically adjusts the equipment operating status, such as starting and stopping the booster pump and adjusting the dosage. In case of failure, an alarm is triggered and the backup equipment is switched, so that domestic and industrial sewage and initial rainwater can be reused for production and greening, and desulfurization wastewater can be recycled in a closed loop, reducing the consumption of fresh water sources.

[0021] The wastewater treatment system comprises, in sequence, a fine screen well 1, a pre-aeration regulating tank 2, an A / O biological treatment unit, a sedimentation tank 5, a multi-media filter, and a dosing and disinfection unit for connecting the incineration system, a quench water tank, a urea preparation tank, and irrigation pipelines for the plant's green areas. The multi-media filter contains a quartz sand filter layer, and the dosing and disinfection unit is used to add disinfectant. The wastewater treatment system has a treatment capacity of 20 m³ / h. 3 / D, of which 10m³ is wastewater from incineration process washing and soft water regeneration. 3 / D、Domestic sewage 5m 3 / D, 5m³ of wastewater from washing material transfer carts inside the workshop 3 / D.

[0022] Fine screens intercept large particles of debris, such as garbage residue, in the water, reducing the load on subsequent systems. The pre-aeration equalization tank 2 achieves homogenization of water quality and quantity through aeration and stirring, avoiding fluctuations in water quality that could affect the biochemical effect. The braided packing material in the anoxic tank 3 forms a microbial film, converting large organic molecules into smaller molecules and improving biodegradability. Under aeration conditions, the contact oxidation tank 4 oxidizes and decomposes organic matter through microbial oxidation, while denitrification is achieved through nitrification liquid recirculation. The sedimentation tank 5 separates mud and water. A multi-media filter intercepts suspended solids and colloids, and chemical disinfection inactivates bacteria and viruses to ensure safe reuse. This meets the water needs of the incineration system for rapid cooling, denitrification, and greening of the plant area, reducing the cost of purchasing external water sources and lowering operating expenses.

[0023] The pre-aeration equalization tank 2 is equipped with an aerator and a level monitoring controller. The level monitoring controller is electrically connected to a first lift pump, the outlet of which is connected to the interior of the pre-aeration equalization tank 2. The hydraulic retention time (HRT) is set to 8 hours. The level monitoring controller monitors the level in the tank in real time. When the level is below a set threshold, the first lift pump is automatically stopped. When the level is above the threshold, the lift pump is started to send the homogenized wastewater into the A / O biological treatment unit. An alarm is triggered when the level is high. The aerator is started at regular intervals to break up water stratification and make the influent water quality (such as COD, BOD) and quantity uniform, avoiding high-concentration wastewater from impacting the biological treatment system. The operation of the lift pump is adjusted through level feedback to prevent the equalization tank from overflowing or becoming empty, ensuring stable water intake to the subsequent treatment unit and preventing equipment from being damaged by dry burning.

[0024] The A / O biological treatment unit includes an anoxic tank 3 and a contact oxidation tank 4. A nitrification liquid return pump is installed in the contact oxidation tank 4, and its outlet is connected to the interior of the anoxic tank 3. Both the anoxic tank 3 and the contact oxidation tank 4 are equipped with braided packing material. This braided packing material forms a stable microbial film, adaptable to fluctuations in influent water quality, and reduces the difficulty of system commissioning and maintenance. The contact oxidation tank 4 is oxygenated by a blower to control the dissolved oxygen concentration. The nitrification liquid return pump operates at a set frequency, transporting the mud-water mixture from the contact oxidation tank 4 to the anoxic tank 3. Denitrifying bacteria on the braided packing material utilize organic matter as a carbon source to convert nitrate nitrogen in the return liquid into nitrogen gas, achieving denitrification. Under aerobic conditions, nitrifying bacteria convert ammonia nitrogen into nitrate nitrogen, while simultaneously microorganisms oxidize and decompose organic matter, removing BOD and COD. The braided packing material increases the microbial attachment area, improving treatment efficiency. The nitrate nitrogen is returned to the anoxic tank 3 via the return pump, forming a denitrification cycle and improving the total nitrogen removal rate.

[0025] The sedimentation tank 5 is equipped with a sludge discharge device at the bottom. One end of the sludge discharge device is connected to a sludge storage tank 7 for connecting to the sludge dewatering system 6. After the effluent from the A / O biological treatment unit enters the sedimentation tank 5, the sludge settles to the bottom of the tank under gravity, and the supernatant flows into the intermediate water tank through the collection weir. The sludge discharge device periodically discharges the bottom sludge to avoid sludge accumulation affecting the sedimentation effect. The suspended solids (SS) in the effluent of the sedimentation tank 5 are ≤20mg / L, providing good influent conditions for subsequent multi-media filtration and ensuring the final effluent water quality. The sludge storage tank 7 temporarily stores the sludge, reducing the processing load of the subsequent dewatering system. The dewatering system reduces the sludge moisture content to below 80%, forming a sludge cake. After dewatering, the sludge cake is sent to the incinerator for incineration treatment, with no solid waste discharged.

[0026] The initial rainwater treatment system includes an initial rainwater tank 9, a second booster pump, an integrated water purifier 10, and a filtration unit connected in sequence. The outlet of the filtration unit merges with the outlet of the chemical disinfection unit and is connected to the quench water tank of the incineration system, the urea preparation tank, and the irrigation pipeline for the greening of the plant area. At the beginning of a rainstorm, rainwater carries surface pollutants (such as dust and garbage debris) into the collection tank. The second booster pump sends the rainwater into the integrated water purifier 10. Coagulation (addition of PAC / PAM) and sedimentation are completed simultaneously in the integrated water purifier 10 to remove suspended solids and some pollutants from the water. The sludge purified by the integrated water purifier 10 enters the sludge storage tank 7, and the purified liquid enters the reuse water tank 11 for recycling. The filtration unit further intercepts fine impurities to ensure that the effluent quality is consistent with the standards for reuse of domestic and industrial wastewater. The initial rainwater is reused for production and greening after treatment. A single treatment can supplement a certain amount of reused water, reduce the consumption of fresh water, and avoid pollution of surrounding water bodies caused by direct discharge of initial rainwater.

[0027] The integrated water purifier model 10 is FA-30. It has two second booster pumps, each with a processing capacity of 30m³. 3 The pumping speed is 30 meters per hour; the effective volume of the rainwater collection tank in the initial rainwater treatment subsystem is 150 m³ / h. 3 The processing time is 5 hours per cycle; The desulfurization wastewater treatment system includes an advanced oxidation reaction unit, a flocculation sedimentation tank 14, and a plate and frame filter press 15 connected in sequence to the desulfurization circulating alkali tank in the incineration system.

[0028] The desulfurization wastewater treatment system is designed to handle 5m³ of wastewater. 3 The system operates at a rate of 4 hours per day, ensuring timely treatment of desulfurization wastewater and preventing disruption to the desulfurization system's circulation. Hydrogen peroxide reacts with ferrous sulfate to generate hydroxyl radicals, which oxidize and decompose sulfides and recalcitrant organic matter in the desulfurization wastewater. Simultaneously, heavy metal ions are converted into easily precipitated forms. Flocculants such as PAC are added to form flocs with the oxidized pollutants and heavy metals, which then settle and separate in sedimentation tank 5. Plate and frame filter press 15 performs deep dewatering on the precipitated sludge, and the clarified liquid is reused in the desulfurization alkaline solution tank to continue participating in the desulfurization reaction, achieving a closed-loop wastewater system. All desulfurization wastewater is reused, with no external discharge, reducing the amount of water needed for the desulfurization system's makeup water.

[0029] The advanced oxidation reaction unit includes an oxidation reaction tank 12 and a chemical reaction tank 13. The oxidation reaction tank 12 and the chemical reaction tank 13 form a four-unit reaction tank. The four-unit reaction tank is equipped with multiple reaction zones for sequentially adding strong oxidant, ferrous sulfate and PAC. The influent flow rate is monitored in real time by a flow meter, and the metering pump adjusts the amount of reagents added according to the flow rate ratio to avoid reagent waste or incomplete treatment.

[0030] The PLC fully automatic control system has a fault alarm function. When the equipment malfunctions, it can send an SMS alarm and automatically switch to the backup equipment. The backup equipment includes, but is not limited to, submersible sewage pumps and blowers. The blowers are housed in a separate blower room with soundproof walls. The blower outlet is equipped with a silencer and a seated spring shock absorber. The PLC system monitors the liquid level and flow rate in real time and automatically controls the wastewater classification and diversion, chemical dosage adjustment, and equipment start-up and shutdown, achieving unattended operation and reducing manual operation costs and management intensity.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment system for medical waste, characterized in that: include: A production and domestic wastewater treatment system that treats organic matter, pathogens and suspended solids in domestic wastewater and sewage generated daily by incineration plants; An initial rainwater treatment system for removing suspended solids and pollutants from rainwater, wherein the initial rainwater treatment system supplements the return water volume of the production and domestic sewage treatment system; A desulfurization wastewater treatment system that treats high-salt and high-heavy-metal wastewater and enables desulfurization recycling; The PLC fully automatic control system is electrically connected to the production and domestic sewage treatment system, the initial rainwater treatment system, and the desulfurization wastewater treatment system.

2. The wastewater treatment system for medical waste according to claim 1, characterized in that: The wastewater treatment system includes, in sequence, a fine screen well, a pre-aeration regulating tank, an A / O biochemical treatment unit, a sedimentation tank, a multi-media filter, and a dosing and disinfection unit for connecting the incineration system, a quench water tank, a urea preparation tank, and irrigation pipelines for the plant's green areas.

3. The wastewater treatment system for medical waste according to claim 2, characterized in that: The pre-aeration regulating tank is equipped with an aeration mixer and a liquid level monitoring controller. The liquid level monitoring controller is electrically connected to a first lift pump, and the outlet of the first lift pump is connected to the interior of the pre-aeration regulating tank.

4. The wastewater treatment system for medical waste according to claim 3, characterized in that: The A / O biochemical treatment unit includes an anoxic tank and a contact oxidation tank. The contact oxidation tank is equipped with a nitrification liquid return pump, and the outlet of the nitrification liquid return pump is connected to the interior of the anoxic tank.

5. The wastewater treatment system for medical waste according to claim 4, characterized in that: The sedimentation tank is equipped with a sludge discharge device at the bottom, and one end of the sludge discharge device is connected to a sludge storage tank for connecting to a sludge dewatering system.

6. The wastewater treatment system for medical waste according to claim 5, characterized in that: The initial rainwater treatment system includes an initial rainwater tank, a second booster pump, an integrated water purifier, and a filtration unit connected in sequence. The outlet of the filtration unit and the outlet of the chemical dosing and disinfection unit are connected together to the quench water tank, urea preparation tank, and irrigation pipeline for greening in the incineration system.

7. The wastewater treatment system for medical waste according to claim 6, characterized in that: The desulfurization wastewater treatment system includes an advanced oxidation reaction unit, a flocculation sedimentation tank, and a plate and frame filter press connected in sequence to the desulfurization circulating alkali tank in the incineration system.

8. The wastewater treatment system for medical waste according to claim 7, characterized in that: The advanced oxidation reaction unit includes an oxidation reaction tank and a chemical reaction tank. The oxidation reaction tank and the chemical reaction tank form a four-unit reaction tank. The four-unit reaction tank is provided with multiple reaction zones for sequentially adding a strong oxidant, ferrous sulfate and PAC.

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