A special medical food wastewater treatment system

Abstract

This utility model provides a wastewater treatment system for special medical foods, relating to the field of wastewater treatment technology. It includes a pretreatment system, a biological treatment system, and a deep treatment system arranged sequentially. The pretreatment system filters the wastewater, adjusts the pH, and performs coagulation and sedimentation. The biological treatment system performs anaerobic and aerobic biological treatment of the wastewater. The deep treatment system removes residual macromolecular organic matter, colloids, bacteria, and other minute impurities. It also includes a sludge treatment system for collecting, concentrating, and dewatering the sludge produced by the pretreatment and biological treatment systems. This system efficiently removes pollutants and nutrients, ensuring stable and reliable water quality and enabling sludge recovery. It solves the technical problems in existing technologies where some substances in special medical food wastewater are difficult to degrade, making wastewater treatment processes unable to cope with the characteristics of special medical food wastewater, leading to sludge expansion, poor treatment results, and increased difficulty and cost of subsequent sludge treatment.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system for special medical foods. Background Technology

[0002] With the booming development of the food for special medical purposes (FSMP) industry, the wastewater treatment problem generated during its production process has become increasingly prominent. Due to their complex composition, including proteins, peptides, fats, carbohydrates, vitamins, minerals, and various additives, FSMP wastewater is characterized by high organic matter content, high suspended solids, large fluctuations in water quality, and the presence of certain biotoxic substances. Traditional wastewater treatment processes, such as the conventional activated sludge process and biological contact oxidation process, are difficult to effectively treat this type of wastewater, often resulting in substandard treatment, high operating costs, and large sludge production. For example, in the activated sludge process, the activity of microorganisms is easily reduced due to water quality shocks when treating high-concentration organic wastewater, leading to unstable treatment results; moreover, because some substances in FSMP wastewater are difficult to degrade, they cause sludge bulking, increasing the difficulty and cost of subsequent sludge treatment. Therefore, developing a highly efficient, economical, and environmentally friendly treatment process specifically for FSMP wastewater is urgently needed.

[0003] In view of the above, this utility model is hereby proposed. Utility Model Content

[0004] The purpose of this invention is to provide a special medical food wastewater treatment system to solve the technical problem that the existing wastewater treatment processes are unable to cope with the characteristics of special medical food wastewater, resulting in poor treatment effects.

[0005] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted: This invention provides a wastewater treatment system for special medical foods, comprising a pretreatment system, a biological treatment system, and an advanced treatment system arranged sequentially; the pretreatment system is used to filter wastewater, adjust pH, and perform coagulation and sedimentation; the biological treatment system is used to perform anaerobic and aerobic biological treatment on the wastewater; and the advanced treatment system is used to remove residual minute impurities. It also includes a sludge treatment system, which is used to collect sludge from the pretreatment system. Part of the sludge is used as activated sludge to supplement the biological treatment system, and the other part is dried through the sludge treatment system.

[0006] Furthermore, the pretreatment system includes a coarse screen, a fine screen, an equalization tank, and an inclined tube sedimentation tank arranged in sequence; The equalization tank is used to adjust the pH of the wastewater to 6.5~7.5; The inclined tube sedimentation tank is used for coagulation and sedimentation. The coarse grid has a grid spacing of 10-15 mm; the fine grid has a grid spacing of 3-5 mm.

[0007] Furthermore, the biological treatment system includes an anaerobic sludge bed reactor and an activated sludge reactor arranged in sequence; The anaerobic sludge bed reactor is used for anaerobic biological treatment. The activated sludge reactor is used for aerobic biological treatment.

[0008] Furthermore, the anaerobic sludge bed reactor is an upflow anaerobic sludge bed reactor, and the temperature inside the upflow anaerobic sludge bed reactor is 30~35℃, and the hydraulic retention time is 12~24 hours. The activated sludge reactor is a sequencing batch reactor (SBR) activated sludge reactor, and the treatment cycle of the SBR activated sludge reactor is 8 to 12 hours.

[0009] Furthermore, the deep processing system includes an ultrafiltration device and a reverse osmosis device arranged in sequence; The ultrafiltration device includes an ultrafiltration treatment unit and an ultrafiltration product water tank arranged in sequence. The reverse osmosis unit includes a reverse osmosis treatment device and a reverse osmosis product water tank arranged in sequence.

[0010] Furthermore, the ultrafiltration membrane in the ultrafiltration treatment device has a molecular weight cutoff of 10~30kDa and an ultrafiltration membrane flux of 50~100L / (m²). 2 ·h); The desalination rate of the reverse osmosis membrane in the reverse osmosis treatment device is >95%.

[0011] Furthermore, the sludge treatment system includes a sludge thickening tank and a plate and frame filter press. The inlet of the sludge thickening tank is connected to the inclined tube settling tank, and the outlet of the sludge thickening tank is connected to the inlet of the plate and frame filter press. The outlet of the sludge thickening tank is also connected to the activated sludge reactor for replenishing activated sludge to the activated sludge reactor. The filtrate outlet of the plate and frame filter press is connected to the equalization tank for sludge drying and filtrate return to the pretreatment system.

[0012] Furthermore, the sludge thickening tank is a gravity thickening sludge thickening tank, and the sludge after treatment in the sludge thickening tank has a moisture content of 95-96%, while the sludge after treatment in the plate and frame filter press has a moisture content of 60-70%.

[0013] Furthermore, a clear water tank is provided between the biological treatment system and the advanced treatment system; The special medical food wastewater treatment system also includes an online environmental monitoring system to monitor whether the wastewater in the reverse osmosis permeate tank and clear water tank meets the discharge standards.

[0014] Furthermore, the substandard wastewater outlet of the reverse osmosis permeate tank is connected to the equalization tank.

[0015] The special medical food wastewater treatment system provided by this utility model has the following beneficial effects: 1. Highly efficient pollutant removal: Organic matter degradation: Through the synergistic effect of anaerobic and aerobic biological treatment, complex macromolecular organic matter in wastewater, such as proteins, sugars, and oils, can be gradually decomposed into smaller molecules and ultimately oxidized into carbon dioxide and water. Actual operation monitoring shows that the removal rate of chemical oxygen demand (COD) can reach over 90%, and the removal rate of biochemical oxygen demand (BOD) exceeds 95%, ensuring a significant reduction in organic pollution indicators in wastewater and meeting stringent discharge standards.

[0016] Nutrient Removal: The process also excels at removing nutrients such as nitrogen and phosphorus from wastewater. Aerobic biological treatment, utilizing the metabolism of microorganisms, converts ammonia nitrogen into nitrogen gas, achieving a total nitrogen removal rate of 70%–80%. Simultaneously, by combining biological and chemically assisted phosphorus removal, the total phosphorus removal rate can be consistently maintained above 85%, effectively preventing eutrophication of receiving water bodies due to excessive nitrogen and phosphorus levels.

[0017] 2. Stable and reliable operation: Water quality and quantity adaptability: The pretreatment system can effectively cope with fluctuations in the quality and quantity of wastewater from special medical food products. No matter how the wastewater quality changes, it can stabilize it within a range suitable for subsequent treatment, ensuring that the entire treatment process is not affected by shocks in water quality and quantity and operates stably at all times.

[0018] 3. Resource recycling: The sludge treatment system properly treats the sludge generated during the treatment process. After thickening and dewatering, the moisture content is reduced to 60%~70%, facilitating subsequent disposal. The dewatered sludge can be converted into organic fertilizer through composting, realizing the resource utilization of sludge. For sludge containing specific components, useful substances such as proteins and minerals can be further extracted for use in other industrial production, which not only reduces secondary pollution of the environment by sludge but also creates certain economic benefits. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a special medical food wastewater treatment system provided by this utility model.

[0021] Icons: 11-Coarse screen; 12-Fine screen; 13-Equalization tank; 14-Inclined tube settling tank; 21-Anaerobic sludge bed reactor; 22-Activated sludge reactor; 31-Ultrafiltration treatment unit; 32-Ultrafiltration permeate tank; 33-Reverse osmosis treatment unit; 34-Reverse osmosis permeate tank; 41-Sludge thickening tank; 42-Plate and frame filter press; 51-Clear pool; 61-Environmental Protection Online Monitoring System. Detailed Implementation

[0022] Unless otherwise defined herein, the scientific and technical terms used in connection with this utility model shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms shall be clear; however, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or foreign definitions. In this application, unless otherwise stated, the use of "or" means "and / or". Furthermore, the use of the term "comprising" and other forms is non-limiting.

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that the terms "proximal end," "distal end," "front end," "rear end," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] The terms "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] This invention provides a wastewater treatment system for special medical foods, comprising a pretreatment system, a biological treatment system, and an advanced treatment system arranged sequentially; the pretreatment system is used to filter wastewater, adjust pH, and perform coagulation and sedimentation; the biological treatment system is used to perform anaerobic and aerobic biological treatment on the wastewater; and the advanced treatment system is used to remove residual minute impurities. It also includes a sludge treatment system, which is used to collect sludge from the pretreatment system. Part of the sludge is used as activated sludge to supplement the biological treatment system, and the other part is dried through the sludge treatment system.

[0030] The pretreatment system can remove larger suspended solids and impurities from wastewater to prevent them from clogging or damaging subsequent equipment. On the other hand, it can adjust the pH value to make the wastewater a suitable acidic or alkaline environment for subsequent microbial treatment. At the same time, through coagulation and sedimentation, colloidal particles and tiny suspended solids in the wastewater can be aggregated into larger flocs, which are easy to settle and separate, removing some organic matter and suspended solids from the wastewater and reducing the load on subsequent biological treatment.

[0031] The biological treatment system decomposes large organic molecules in wastewater into smaller organic molecules through anaerobic biological treatment, while generating biogas, thus achieving partial degradation of organic matter and energy recovery. Aerobic biological treatment further degrades organic matter, converting it into carbon dioxide, water, and microbial cell matter, ensuring that the wastewater meets discharge standards.

[0032] The advanced treatment system removes residual large-molecule organic matter, colloids, bacteria and other tiny impurities from wastewater, ensuring the clarity and stability of the effluent, so that the effluent meets the standards for production reuse or discharge, and realizes the recycling or compliant discharge of water resources.

[0033] The sludge treatment system reduces sludge volume, making subsequent processing easier.

[0034] Tiny impurities include large organic molecules, colloids, or bacteria.

[0035] In some specific embodiments, the pretreatment system includes a coarse screen 11, a fine screen 12, an equalization tank 13, and an inclined tube sedimentation tank 14 arranged in sequence; each part works together to stabilize the water quality within a range suitable for subsequent treatment, ensuring that the entire treatment process is not affected by the impact of water quality and quantity, and always operates stably.

[0036] The equalization tank 13 is used to adjust the pH value of the wastewater to 6.5~7.5, so that the wastewater is in a suitable acid-base environment for subsequent microbial treatment, and avoids excessive acidity or alkalinity from inhibiting the activity of microorganisms.

[0037] The inclined tube sedimentation tank 14 is used for coagulation and sedimentation. Polyaluminum chloride (PAC) and polyacrylamide (PAM) can be added as coagulants. The dosage of PAC is 100~200mg / L and the dosage of PAM is 5~10mg / L. Through coagulation, colloidal particles and small suspended solids in the wastewater are aggregated into larger flocs, which facilitates sedimentation and separation, removes some organic matter and suspended solids from the wastewater, and reduces the load on subsequent biological treatment.

[0038] Rational use of chemicals: In stages requiring chemical addition, such as flocculation and sedimentation, precise water quality monitoring and dosage control ensure that the amount of chemicals used is maintained at the minimum effective level. At the same time, cost-effective flocculants and pH adjusters are selected, significantly reducing chemical procurement costs while ensuring treatment effectiveness.

[0039] The coarse grid 11 has a grid spacing of 10-15 mm; the fine grid 12 has a grid spacing of 3-5 mm.

[0040] Two screens, one coarse and one fine, are installed to remove larger suspended solids and impurities from the wastewater, such as fragments of packaging bags and raw material residues.

[0041] Easy equipment maintenance: The equipment selection for each treatment unit emphasizes practicality and reliability. Equipment such as mechanical bar screens, sedimentation tanks, and sand filters has a simple structure, is easy to operate, and requires minimal daily maintenance. Furthermore, the process design fully considers the replacement of vulnerable parts and the space available for equipment maintenance, reducing the probability of equipment failure. Even if problems occur, they can be quickly repaired, ensuring the continuous operation of the treatment process.

[0042] In some specific embodiments, the biological treatment system includes an anaerobic sludge bed reactor 21 and an activated sludge reactor 22 arranged in sequence; the anaerobic sludge bed reactor 21 is used for anaerobic biological treatment; and the activated sludge reactor 22 is used for aerobic biological treatment.

[0043] In some specific embodiments, the anaerobic sludge bed reactor 21 is an upflow anaerobic sludge bed reactor, in which wastewater flows from bottom to top within the reactor, making full contact with the anaerobic sludge at the bottom. The temperature inside the upflow anaerobic sludge bed reactor is 30~35℃, and the hydraulic retention time is 12~24 hours.

[0044] The activated sludge reactor 22 is a sequencing batch reactor (SBR). The anaerobic wastewater enters the SBR tank. The treatment cycle of the SBR is 8-12 hours. Each SBR cycle includes five stages: influent, aeration, sedimentation, effluent discharge, and idle. During the aeration stage, air is blown into the tank, allowing aerobic microorganisms to utilize the organic matter in the wastewater for growth and reproduction, further degrading the organic matter and converting it into carbon dioxide, water, and microbial cell matter, ensuring that the wastewater meets discharge standards.

[0045] Energy optimization: In the biological treatment stage, by rationally controlling anaerobic and aerobic reaction conditions, such as temperature, dissolved oxygen, and hydraulic retention time, the microorganisms are kept in an optimal metabolic state, improving treatment efficiency while reducing energy consumption. Furthermore, energy-efficient products, such as highly efficient aeration equipment and water pumps, are prioritized during equipment selection, further reducing the overall energy cost of the treatment process and achieving economical and efficient operation.

[0046] In some specific embodiments, the advanced treatment system includes an ultrafiltration device and a reverse osmosis device arranged in sequence; the ultrafiltration device includes an ultrafiltration treatment device 31 and an ultrafiltration product water tank 32 arranged in sequence; the reverse osmosis device includes a reverse osmosis treatment device 33 and a reverse osmosis product water tank 34 arranged in sequence.

[0047] Ultrafiltration is used to remove residual large-molecule organic matter, colloids, bacteria and other tiny impurities from the wastewater after biological treatment.

[0048] The water effluent from the reverse osmosis permeate tank 34, after deep treatment, has excellent quality, with some indicators even exceeding urban wastewater reuse standards. The treated wastewater can be reused in production processes with relatively low water quality requirements, such as equipment cooling and workshop floor washing, according to the company's production needs. This achieves water resource recycling, reduces the company's fresh water consumption, lowers production costs, and aligns with the concept of sustainable development.

[0049] In some specific embodiments, the ultrafiltration membrane in the ultrafiltration treatment device 31 has a molecular weight cutoff of 10~30kDa and an ultrafiltration membrane flux of 50~100L / (m²). 2 •h); to ensure the clarity and stability of the effluent quality.

[0050] Using ultrafiltration effluent as feed water, reverse osmosis is performed using a reverse osmosis membrane. The desalination rate of the reverse osmosis membrane in the reverse osmosis treatment device 33 is >95%. It can remove dissolved salts, heavy metal ions, etc. from wastewater, so that the effluent meets the production reuse standards or discharge standards, realizing the recycling or compliant discharge of water resources.

[0051] In some specific embodiments, the sludge treatment system includes a sludge thickening tank 41 and a plate and frame filter press 42. The inlet of the sludge thickening tank 41 is connected to the inclined tube settling tank 14, and the outlet of the sludge thickening tank 41 is connected to the inlet of the plate and frame filter press. The outlet of the sludge thickening tank 41 is also connected to the activated sludge reactor 22 for replenishing activated sludge to the activated sludge reactor. The filtrate outlet of the plate and frame filter press 42 is connected to the equalization tank 13 for sludge drying treatment and filtrate return to the pretreatment system.

[0052] The concentrated sludge is dewatered using a plate and frame filter press. Under certain pressure, the sludge moisture content is further reduced to 60%-70%, resulting in dry sludge cake, which is easy to transport and dispose of. At the same time, the filtrate is recycled and re-entered into the wastewater treatment system to avoid secondary pollution.

[0053] In some specific embodiments, the sludge thickening tank 41 is a gravity thickening sludge thickening tank, the sludge after treatment by the sludge thickening tank 41 has a water content of 95~96%, and the sludge after treatment by the plate and frame filter press 42 has a water content of 60~70%.

[0054] In some specific embodiments, a clear water tank 51 is provided between the biological treatment system and the advanced treatment system; the special medical food wastewater treatment system also includes an online environmental monitoring system 61, used to monitor whether the wastewater in the reverse osmosis permeate tank and the clear water tank meets the discharge standards.

[0055] In some specific embodiments, the substandard wastewater outlet of the reverse osmosis permeate tank is connected to the equalization tank 13.

[0056] The present invention will be further illustrated below through embodiments. Unless otherwise specified, the materials in the embodiments are prepared according to existing methods or purchased directly from the market.

[0057] Example 1: Combination Figure 1 The present invention describes a special medical food wastewater treatment system, comprising a pretreatment system, a biological treatment system, and an advanced treatment system arranged sequentially. The deep processing system is used to remove residual macromolecular organic matter, colloids, bacteria and other minute impurities; It also includes a sludge treatment system for collecting, concentrating, and dewatering the sludge produced by the pretreatment system and the biological treatment system.

[0058] The pretreatment system includes a coarse screen 11, a fine screen 12, an equalization tank 13, and an inclined tube sedimentation tank 14 arranged in sequence; wherein, the equalization tank 13 is used to adjust the pH value of the wastewater to 6.5~7.5; the inclined tube sedimentation tank 14 is used for coagulation and sedimentation; the coarse screen 11 has a screen spacing of 10mm; the fine screen 12 has a screen spacing of 3mm.

[0059] The biological treatment system includes an anaerobic sludge bed reactor 21 and an activated sludge reactor 22 arranged sequentially. The anaerobic sludge bed reactor 21 is an upflow anaerobic sludge bed reactor used for anaerobic biological treatment, with an internal temperature of 30-35℃ and a hydraulic retention time of 12-24 hours. The activated sludge reactor 22 is a sequencing batch reactor (SBR) used for aerobic biological treatment. The SBR's treatment cycle is 8-12 hours.

[0060] The advanced treatment system includes an ultrafiltration unit and a reverse osmosis unit arranged in sequence; the ultrafiltration unit includes an ultrafiltration treatment device 31 and an ultrafiltration permeate tank 32 arranged in sequence; the reverse osmosis unit includes a reverse osmosis treatment device 33 and a reverse osmosis permeate tank 34 arranged in sequence. Specifically, the ultrafiltration membrane in the ultrafiltration treatment device 31 has a molecular weight cutoff of 20 kDa and an ultrafiltration membrane flux of 100 L / (m²). 2 •h); The desalination rate of the reverse osmosis membrane in the reverse osmosis treatment unit 33 is >95%.

[0061] The sludge treatment system includes a sludge thickening tank 41 and a plate and frame filter press 42. The inlet of the sludge thickening tank 41 is connected to the inclined tube settling tank 14, and the outlet of the sludge thickening tank 41 is connected to the inlet of the plate and frame filter press. The outlet of the sludge thickening tank 41 is also connected to the activated sludge reactor 22 for replenishing activated sludge to the activated sludge reactor. The filtrate outlet of the plate and frame filter press 42 is connected to the equalization tank 13 for sludge drying treatment and filtrate return to the pretreatment system.

[0062] Among them, the sludge thickening tank 41 is a gravity thickening sludge thickening tank, and the sludge after treatment in the sludge thickening tank 41 has a water content of 95~96%, while the sludge after treatment in the plate and frame filter press 42 has a water content of 60~70%.

[0063] A clear water tank 51 is provided between the biological treatment system and the advanced treatment system; The environmental online monitoring system 61 is used to monitor whether the wastewater in the reverse osmosis permeate tank and clear water tank meets the discharge standards. The outlet of the non-compliant wastewater from the reverse osmosis permeate tank is connected to the equalization tank 13.

[0064] Taking the special medical food wastewater treatment system provided in Example 1 as an example, the wastewater from a special medical food production enterprise is treated, with a daily wastewater volume of 50m³. 3 .

[0065] In the preprocessing stage: The coarse and fine bar screens intercept approximately 10 kg of suspended solids and impurities daily, effectively ensuring the normal operation of subsequent equipment.

[0066] After adding an appropriate amount of acid-base regulator, the pH value of the wastewater stabilized at 6.8~7.2, creating favorable conditions for subsequent microbial treatment.

[0067] After coagulation and sedimentation, the COD removal rate of wastewater reaches 30%~35%, and the suspended solids removal rate reaches 80%~85%.

[0068] In the biological treatment stage: After one month of operation, the UASB reactor achieved an average daily biogas production of 20m³. 3 It can be used to meet some of the energy needs within the factory area, and the cumulative COD removal rate of wastewater reaches 60%~65%.

[0069] During operation, the COD concentration in the SBR tank remained stable below 80 mg / L and the ammonia nitrogen concentration was below 8 mg / L, laying a good foundation for advanced treatment.

[0070] In the deep processing stage: After ultrafiltration, the effluent is clear, with most visible impurities removed, and the ultrafiltration membrane flux remains stable at 70~80L / (m²). 2 ·h).

[0071] After reverse osmosis treatment, the effluent COD concentration is below 50 mg / L and the ammonia nitrogen concentration is below 5 mg / L, fully meeting the national discharge standards and can be directly reused or discharged.

[0072] In the sludge treatment stage: The sludge thickening tank reduces the sludge moisture content from 98.5% to 95.5%, resulting in a significant reduction in volume.

[0073] After dewatering by the plate and frame filter press, dry sludge cake with a moisture content of 65% is obtained. The sludge production is reduced by 32% compared with the traditional process, effectively reducing the cost of sludge disposal.

[0074] In summary, the special medical food wastewater treatment process of this utility model demonstrates excellent treatment effect in practical applications and has broad application prospects.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A special medical food wastewater treatment system, characterized in that, It includes a pretreatment system, a biological treatment system, and an advanced treatment system arranged sequentially; the pretreatment system is used to filter wastewater, adjust pH, and perform coagulation and sedimentation; the biological treatment system is used to perform anaerobic biological treatment and aerobic biological treatment of wastewater; The deep processing system is used to remove residual minute impurities; It also includes a sludge treatment system, which is used to collect sludge from the pretreatment system. Part of the sludge is used as activated sludge to supplement the biological treatment system, and the other part is dried through the sludge treatment system.

2. The special medical food wastewater treatment system according to claim 1, characterized in that, The pretreatment system includes a coarse screen (11), a fine screen (12), an equalization tank (13), and an inclined tube sedimentation tank (14) arranged in sequence. The equalization tank (13) is used to adjust the pH of the wastewater to 6.5~7.5; The inclined tube settling tank (14) is used for coagulation and sedimentation; The coarse grid (11) has a grid spacing of 10~15mm; the fine grid (12) has a grid spacing of 3~5mm.

3. The special medical food wastewater treatment system according to claim 1, characterized in that, The biological treatment system includes an anaerobic sludge bed reactor (21) and an activated sludge reactor (22) arranged in sequence. The anaerobic sludge bed reactor (21) is used for anaerobic biological treatment; The activated sludge reactor (22) is used for aerobic biological treatment.

4. The special medical food wastewater treatment system according to claim 3, characterized in that, The anaerobic sludge bed reactor (21) is an upflow anaerobic sludge bed reactor. The temperature inside the upflow anaerobic sludge bed reactor is 30~35℃ and the hydraulic retention time is 12~24 hours. The activated sludge reactor (22) is a sequencing batch reactor, and the processing cycle of the sequencing batch reactor is 8 to 12 hours.

5. The special medical food wastewater treatment system according to claim 2, characterized in that, The advanced treatment system includes an ultrafiltration unit and a reverse osmosis unit arranged in sequence; The ultrafiltration device includes an ultrafiltration treatment device (31) and an ultrafiltration product water tank (32) arranged in sequence. The reverse osmosis device includes a reverse osmosis treatment unit (33) and a reverse osmosis product water tank (34) arranged in sequence.

6. The special medical food wastewater treatment system according to claim 5, characterized in that, The ultrafiltration treatment device (31) has an ultrafiltration membrane with a molecular weight cutoff of 10~30kDa and an ultrafiltration membrane flux of 50~100L / (m²). 2 ·h); The desalination rate of the reverse osmosis membrane in the reverse osmosis treatment device (33) is >95%.

7. The special medical food wastewater treatment system according to claim 2, characterized in that, The sludge treatment system includes a sludge thickening tank (41) and a plate and frame filter press (42). The inlet of the sludge thickening tank (41) is connected to the inclined tube settling tank (14), and the outlet of the sludge thickening tank (41) is connected to the inlet of the plate and frame filter press. The outlet of the sludge thickening tank (41) is also connected to the activated sludge reactor (22) for replenishing activated sludge to the activated sludge reactor. The filtrate outlet of the plate and frame filter press (42) is connected to the equalization tank (13) for sludge drying treatment and filtrate return to the pretreatment system.

8. The special medical food wastewater treatment system according to claim 7, characterized in that, The sludge thickening tank (41) is a gravity thickening sludge thickening tank. The sludge after treatment by the sludge thickening tank (41) has a water content of 95-96%, and the sludge after treatment by the plate and frame filter press (42) has a water content of 60-70%.

9. The special medical food wastewater treatment system according to any one of claims 1 to 8, characterized in that, A clear water tank (51) is provided between the biological treatment system and the deep treatment system. The special medical food wastewater treatment system also includes an environmental online monitoring system (61) for monitoring whether the wastewater in the reverse osmosis permeate tank and clear water tank meets the discharge standards.

10. The special medical food wastewater treatment system according to claim 9, characterized in that, The substandard wastewater outlet of the reverse osmosis permeate tank is connected to the equalization tank (13).

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