CN111777267A - Mud-free Fenton coupling multi-module medical wastewater treatment method - Google Patents

Mud-free Fenton coupling multi-module medical wastewater treatment method Download PDF

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CN111777267A
CN111777267A CN202010575220.2A CN202010575220A CN111777267A CN 111777267 A CN111777267 A CN 111777267A CN 202010575220 A CN202010575220 A CN 202010575220A CN 111777267 A CN111777267 A CN 111777267A
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sewage
tank
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李志豪
吴敏
秦艳涛
张仲琨
凌立巍
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Southeast University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/003—Wastewater from hospitals, laboratories and the like, heavily contaminated by pathogenic microorganisms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/11—Turbidity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1263—Sequencing batch reactors [SBR]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The invention relates to a sludge-free Fenton coupling multi-module medical wastewater treatment method, aims at the treatment problem of high-concentration sewage in the medical wastewater industry, overcomes the defects of the traditional process technology, and provides a novel sludge-free Fenton catalytic oxidation treatment coupling compact biochemical treatment system and a novel medical wastewater treatment method with a plurality of novel efficient unit technology coupling. The invention fully combines the inherent characteristics of different sewage treatment technologies of each unit, realizes the problem that antibiotics can not be completely degraded by a biochemical treatment method, exerts the treatment capability of an advanced oxidation technology, stabilizes and promotes the treatment capability of a biochemical system, has good effluent quality, simple and stable treatment process and low treatment cost, has effluent COD, total ammonia nitrogen and characteristic pollutant indexes which are obviously superior to the wastewater treatment level of the similar industry, and has good popularization and application prospects.

Description

Mud-free Fenton coupling multi-module medical wastewater treatment method
Technical Field
The invention relates to the field of medical wastewater treatment methods, in particular to an efficient mud-free Fenton coupling multi-module medical wastewater treatment method.
Background
Medical wastewater comes from hospitals, contains a large amount of pathogenic bacteria, viruses and chemical agents and needs special process treatment. Medical wastewater contains a large amount of antibiotics due to a large amount of anti-interference treatments. The discovery and use of antibiotics is an important step forward in humans, which enables us to cope with bacterial infections, which are considered as a first threat to human health. Until the last few years, the problem of abuse of antibiotics has attracted scientific and public attention. Antibiotic resistance phenomena are becoming more and more evident and antibiotic residues are found in various environmental substrates, including surface and ground water, soil, waste, and even food on our dining tables. The number of these drugs is only increasing and never decreasing, which directly threatens the life status of the entire ecosystem.
However, the existing biochemical treatment process has great problems in aspects of pertinence, effectiveness, stability and economy, and the subsequent membrane is seriously polluted and blocked due to the fact that no method is used for treating the antibiotic wastewater, the membrane concentration rate is low, the evaporation capacity of saline water is large, the reuse rate of reclaimed water cannot be increased, the water consumption cannot be reduced, and even pollution accidents are caused. The treatment of toxic high-concentration sewage becomes a key difficult problem and the most key bottleneck restricting the development of enterprises.
The main process of the traditional biochemical treatment of medical wastewater, but practice proves that most biochemical treatment systems are difficult to treat antibiotic wastewater, and the problems of serious biological foam, high biochemical effluent chroma and the like generally exist.
In order to enhance the biochemical treatment effect, many improved biochemical treatment means are emerging. Such as increasing the retention time of sewage in biochemistry, diluting with water in large proportion before treatment, increasing the sludge concentration and the like. For a biochemical system with low toxicity and large tank capacity, the impact resistance of the biochemical system can be improved really, and the removal effect of stable ammonia nitrogen has a certain effect, but under the condition of sufficient biochemical retention time, biochemical organic matters are completely degraded basically, and the effect cannot be improved by prolonging the time. On the other hand, highly toxic waste water, or antibiotic waste water in similar medical waste water, itself has been the activity of biochemical systems. Cannot be processed simply by a biochemical suite of systems.
In summary, the conventional wastewater treatment method cannot meet the requirements of medical wastewater, especially high-concentration medical wastewater treatment and recycling in pertinence, stability and treatment effect, and cannot meet the increasingly strict environmental protection requirements of China under 'ten items of water', the problem of medical water pollution becomes a key restriction factor for industrial development, and the development of a stable, efficient and low-cost medical wastewater treatment method is urgently needed.
Disclosure of Invention
Aiming at the problem of high-concentration sewage treatment in the medical wastewater industry and overcoming the defects of the traditional process technology, the invention provides a sludge-free Fenton coupling multi-module medical wastewater treatment method. The inherent characteristics of each single technology are fully combined, and the antibiotics and toxic substances in the medical wastewater are effectively degraded. Has the characteristics of high efficiency, selectivity, removal stability and the like, improves the water quality of the purified water of the biochemical system, and exerts the treatment effect of the biochemical system. The sludge-free Fenton method is utilized to improve the platform property and universality of the treatment technology, high-efficiency water outlet is realized, and the sludge-free Fenton method has the characteristics of low COD, low content of characteristic pollutants, stable denitrification, simple flow, low cost and the like.
The invention provides a sludge-free Fenton coupling multi-module medical wastewater treatment method, which comprises the following specific steps of:
step 1, medical high-concentration wastewater generated by a production process firstly enters an adjusting tank 1, enters an air floatation tank after being buffered and adjusted and stabilizing water quality, and large-particle pollutants in the wastewater are removed by adopting micro-nano bubbles;
step 2, the sewage treated in the step 1 enters a sludge-free Fenton catalytic oxidation tank NSFO, the sewage treated in the step 1 enters the sludge-free Fenton catalytic oxidation tank NSFO, and iron powder and Fe do not need to be added2+The Fenton reagent and the like excite an oxygen-rich substance to generate hydroxyl radicals by utilizing a catalyst filler, and active radicals and other particles in a synergistic system are used for efficiently decomposing toxic organic pollutants;
3, enabling the sewage flowing out of the NSFO of the sludge-free Fenton catalytic oxidation tank to enter a membrane bioreactor MBR module after passing through a regulating tank 2, performing sewage treatment by adopting an A2O-MBR process, and decomposing C, N, P in the sewage by using active microorganisms;
step 4, enabling the biochemically treated sewage to enter an ultrafiltration membrane component UFM (UFM), and further purifying the sewage to reach a recycling standard;
step 5, enabling concentrated solution generated by ultrafiltration membrane treatment to enter a mechanical recompression evaporation MVR, separating salt after evaporation, enabling tail gas to enter a heat accumulating type thermal oxidation tower GRTO, and oxidizing VOCs into CO2And H2O。
As a further improvement of the method, in the step 1, the diameter of bubbles in the pressurized dissolved air floatation is 30-50 um, the dissolved air effect is 70-80%, a large amount of fine bubbles are introduced into water to realize solid-liquid separation, the diameter of the bubbles is generally 30-50 um, and the dissolved air effect is 70-80%.
As a further improvement of the invention, the COD range of the wastewater entering the step 2 is 1000-30000 mg/L, raw water does not need to be diluted, and non-contact type full-closed advanced treatment is adopted, so that the wastewater can be used immediately after being opened, responds timely, runs efficiently, is specially isolated, is completely removed and collected, and is recovered on the ground without involving procedures such as environmental impact evaluation and the like.
As a further improvement of the invention, the A2O-MBR in the step 3 is provided with a synchronous nitrogen and phosphorus removal process, two sections of reflux are arranged in the process, one section is that the mixed liquid in the membrane tank flows back to the anoxic tank to realize denitrification, the other section is that the mixed liquid in the anoxic tank flows back to the anaerobic tank to realize anaerobic phosphorus release, and the membrane module is used for replacing a secondary sedimentation tank in the traditional activated sludge process, so that high-efficiency solid-liquid separation can be carried out, the aim of water purification is fulfilled, and the quality of effluent water is stable.
As a further improvement of the invention, in the step 4, sewage enters the ultrafiltration membrane component through the booster pump, substances such as water molecules, small molecular solutes and the like permeate the surface of the membrane under the driving of pressure difference by utilizing the sieving effect and the electrostatic effect of the membrane, and the large molecular solutes are intercepted, so that the purification purpose is realized, and the membrane component replaces the traditional secondary sedimentation tank, so that the high-efficiency solid-liquid separation can be carried out. If the sewage can not reach the standard after treatment, the sewage enters the ultrafiltration membrane component through the booster pump according to the characteristics of water quality, and substances such as water molecules, small molecular solutes and the like permeate the surface of the membrane under the driving of pressure difference by utilizing the screening effect and the electrostatic effect of the membrane, while the large molecular solutes are intercepted, thereby realizing the purification purpose. Can separate virus, bacteria, colloid, suspended impurity and macromolecular organic matter, thus purifying water quality. The removal rate of colloid can reach 99.99 percent, the turbidity is less than 0.2NTU, the SS particle content is less than 0.5mg/L, the virus removal rate is more than 3log, the SDI is less than 2, and the TOC removal rate is 30 to 60 percent. And separating and concentrating the sewage treated in the biochemical tank into a permeate liquid and a concentrate liquid, allowing the permeate liquid to enter the next step of the process, namely MVR evaporation to remove salt, and returning the concentrate liquid to the previous step of the process for secondary treatment.
As a further improvement of the present invention, in the evaporation system in step 5, the low-temperature secondary vapor generated by evaporation is recompressed by the mechanical compressor, the pressure and temperature of the secondary vapor are increased and then enter the evaporator to be used as a heat source for reuse, in the MVR evaporation system, the low-temperature secondary vapor generated by evaporation is recompressed by the mechanical compressor, and the pressure and temperature of the secondary vapor are increased and then enter the evaporator to be used as a heat source for reuse. By using the technology, the waste steam is fully utilized, and the evaporation energy consumption is reduced. In addition, the MVR evaporator also has the characteristics of compact equipment and small occupied area.
Compared with the prior art, the technical scheme of the invention has the following advantages and positive effects:
(1) aiming at the characteristic of high-concentration wastewater in the medical industry, a large amount of fine bubbles are introduced into water through an air floatation technology after passing through a regulating tank to realize solid-liquid separation, and suspended matters, colloid and a part of organic matters in the water are pretreated during sludge treatment, so that the blockage and the wrapping of the suspended matters and the part of organic matters on a catalyst can be effectively avoided, and the subsequent sludge-free Fenton catalytic oxidation reaction can be more favorably carried out.
(2) Before entering the membrane bioreactor A20-MBR, a sludge-free Fenton catalytic oxidation technology NSFO is developed. And (2) enabling the sewage treated in the step (1) to enter a non-mud Fenton catalytic oxidation tank NSFO, exciting oxygen-rich substances by utilizing a catalyst filler to generate hydroxyl radicals, and coordinating with particles such as active radicals in a system, so that the bonds of toxic organic pollutants are broken, and the biodegradability of water quality is improved.
(3) Due to the effect of the sludge-free Fenton catalytic oxidation technology, the antibiotic content and the biotoxicity of the wastewater are obviously reduced, the biochemical performance is greatly improved, and by combining the respective advantages of A2O and MBR processes, the method has the advantages of good effluent quality, small floor area, small residual sludge discharge amount and the like. The A2O-MBR has a synchronous nitrogen and phosphorus removal process, and two sections of reflux are arranged in the process, wherein one section is that the mixed liquid in the membrane tank flows back to the anoxic tank to realize denitrification, and the other section is that the mixed liquid in the anoxic tank flows back to the anaerobic tank to realize anaerobic phosphorus release. The membrane component is used for replacing a secondary sedimentation tank in the traditional activated sludge process, so that high-efficiency solid-liquid separation can be carried out, the aim of water purification is fulfilled, and the quality of effluent water is stable.
(4) After the wastewater is refluxed for two sections, the membrane component replaces the traditional secondary sedimentation tank, and the high-efficiency solid-liquid separation can be carried out. If the sewage can not reach the standard after treatment, the sewage enters the ultrafiltration membrane component through the booster pump according to the characteristics of water quality, and substances such as water molecules, small molecular solutes and the like permeate the surface of the membrane under the driving of pressure difference by utilizing the screening effect and the electrostatic effect of the membrane, while the large molecular solutes are intercepted, thereby realizing the purification purpose. Can separate virus, bacteria, colloid, suspended impurity and macromolecular organic matter, thus purifying water quality. The removal rate of colloid can reach 99.99 percent, the turbidity is less than 0.2NTU, the SS particle content is less than 0.5mg/L, the virus removal rate is more than 3log, the SDI is less than 2, and the TOC removal rate is 30 to 60 percent. And separating and concentrating the sewage treated in the biochemical tank into a permeate liquid and a concentrate liquid, allowing the permeate liquid to enter the next step of the process, namely MVR evaporation to remove salt, and returning the concentrate liquid to the previous step of the process for secondary treatment.
(5) The sewage is desalted through MVR, and the salt in the sewage is recycled, so that zero discharge of industrial sewage can be realized. In the MVR evaporation system, low-temperature secondary steam generated by evaporation is recompressed through a mechanical compressor, and the pressure and the temperature of the secondary steam are increased and then enter an evaporator to be used as a heat source for reutilization. By using the technology, the waste steam is fully utilized, and the evaporation energy consumption is reduced. In addition, the MVR evaporator also has the characteristics of compact equipment and small occupied area.
(6) Aiming at the problem of high-concentration sewage treatment in the medical wastewater industry, the invention overcomes the defects of the traditional process technology, and provides a novel composite treatment method with high-efficiency unit technology coupled with multiple sewage treatment technologies. The inherent characteristics of each single technology are fully combined, and the antibiotics and toxic substances in the medical wastewater are effectively degraded. The device has the characteristics of high-efficiency selectivity, stable removal and the like, improves the water purification quality of a biochemical system, exerts the treatment effect of the biochemical system, utilizes a mud-free Fenton method, improves the platform property and universality of the treatment technology, and has the characteristics of low COD (chemical oxygen demand), low content of characteristic pollutants, stable denitrification, simple flow, low cost and the like.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments below:
the application provides a non-mud Fenton coupling multi-module medical wastewater treatment method. The inherent characteristics of each single technology are fully combined, and the antibiotics and toxic substances in the medical wastewater are effectively degraded. The device has the characteristics of high efficiency, selectivity, removal stability and the like, improves the water purification quality of a biochemical system, exerts the treatment effect of the biochemical system, utilizes a sludge-free Fenton method, improves the platform property and universality of the treatment technology, efficiently discharges water, and has the characteristics of low COD (chemical oxygen demand), low content of characteristic pollutants, stable denitrification, simple flow, low cost and the like.
Example 1
The method of the invention is applied to a certain pharmaceutical manufacturer in Jiangsu to produce high-concentration sewage, and the specific water quality of the inlet water is shown in Table 1. The sewage treatment implementation process is carried out according to the following steps.
Step 1, high-concentration sewage generated by a production process firstly enters an adjusting tank 1, enters an air floatation tank after being buffered and adjusted and stabilizing water quality, and large-particle pollutants in the sewage are removed by adopting micro-nano bubbles;
step 2, enabling the sewage treated in the step 1 to enter a sludge-free Fenton catalytic oxidation tank NSFO, decomposing organic pollutants in the sewage by utilizing hydroxyl radicals generated by hydrogen peroxide under the catalytic action, and improving the biodegradability of the sewage;
3, enabling the sewage flowing out of the NSFO of the sludge-free Fenton catalytic oxidation tank to enter a membrane bioreactor MBR module after passing through a regulating tank 2, performing sewage treatment by adopting an A2O-MBR process, and decomposing C, N, P in the sewage by using active microorganisms;
step 4, enabling the biochemically treated sewage to enter an ultrafiltration membrane component UFM (UFM), and further purifying the sewage to reach a recycling standard;
and 5, feeding the concentrated solution generated by the ultrafiltration membrane treatment into a mechanical recompression evaporation MVR, and separating salt after evaporation. Tail gas enters a regenerative thermal oxidation tower GRTO to oxidize VOCs into CO2And H2O。
The specific reaction parameters in this example are: the air flotation technology in the step 1 controls the retention time for 15min, and the room temperature is 12 ℃ during the reaction. And 2, pretreating the wastewater and then feeding the wastewater into a sludge-free Fenton catalytic oxidation tank, wherein the circulation time in the reaction tank is 3 hours. And 3, adopting an A20-MBR process by the membrane bioreactor MBR module in the step 3, enabling the hydraulic retention time to be 4h, and enabling the mixed liquid in the MBR to flow back to the anoxic tank with the reflux ratio of 200%. And (4) treating the UFM by using the ultrafiltration membrane component for 6 hours in running time, backwashing once every 45 minutes, and backwashing for 3 minutes each time. And (5) controlling the operation time of the heat accumulating type thermal oxidation tower GRTO for 30 minutes at the temperature of 500 ℃.
TABLE 1 treatment of high-concentration sewage from pharmaceutical manufacturers of Jiangsu province
Figure BDA0002551095520000051
Figure BDA0002551095520000061
Example 2
The specific quality of the inlet water produced by a certain pesticide manufacturer in Jiangsu is shown in Table 2. The reaction procedure was the same as in example 1, and the specific reaction parameters were as follows.
The specific reaction parameters in this example are: the air flotation technology in the step 1 controls the retention time to be 25min, and the room temperature is 4 ℃ during the reaction. And 2, pretreating the wastewater and then feeding the wastewater into a sludge-free Fenton catalytic oxidation tank, wherein the circulation time in the reaction tank is 6 hours. And 3, adopting an A20-MBR process by the membrane bioreactor MBR module in the step 3, enabling the hydraulic retention time to be 6h, and enabling the mixed liquid in the MBR to flow back to the anoxic tank with the reflux ratio of 300%. And (4) treating the UFM of the ultrafiltration membrane component in the step 4, wherein the running time is 12 hours, the UFM is backwashed once in 45 minutes, and each backwashing is carried out for 3 minutes. And (5) controlling the operation time of the heat accumulating type thermal oxidation tower GRTO for 30 minutes at the temperature of 600 ℃.
TABLE 2 treatment of high-concentration sewage from pharmaceutical manufacturers in Jiangsu province
Figure BDA0002551095520000062
Example 3
High-concentration antibiotics and precursor wastewater are produced by an antibiotic manufacturer in Jiangsu, and the specific inlet water quality is shown in Table 3. The reaction procedure was the same as in example 1, and the specific reaction parameters were as follows.
The specific reaction parameters in this example are: the air flotation technology in the step 1 controls the retention time to be 30min, and the room temperature is 23 ℃ during the reaction. And 2, pretreating the wastewater and then feeding the wastewater into a sludge-free Fenton catalytic oxidation tank, wherein the circulation time in the reaction tank is 6 hours. And 3, adopting an A20-MBR process by the membrane bioreactor MBR module in the step 3, enabling the hydraulic retention time to be 8h, and enabling the mixed liquid in the MBR to flow back to the anoxic tank at a reflux ratio of 400%. And (4) treating the UFM in the step 4, wherein the running time is 23 hours, the UFM is backwashed once in 45 minutes, and each backwashing time is 3 minutes. And (5) controlling the operation time of the heat accumulating type thermal oxidation tower GRTO for 60 minutes at the temperature of 600 ℃.
TABLE 3 treatment of high-concentration sewage produced by pharmaceutical manufacturers in Jiangsu province
Figure BDA0002551095520000063
Figure BDA0002551095520000071
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made according to the technical spirit of the present invention are within the scope of the present invention as claimed.

Claims (6)

1. A mud-free Fenton coupling multi-module medical wastewater treatment method comprises the following specific steps:
step 1, medical high-concentration wastewater generated by a production process firstly enters an adjusting tank 1, enters an air floatation tank after being buffered and adjusted and stabilizing water quality, and large-particle pollutants in the wastewater are removed by adopting micro-nano bubbles;
step 2, the sewage treated in the step 1 enters a sludge-free Fenton catalytic oxidation tank NSFO without adding iron powder and Fe2+The Fenton reagent and the like excite an oxygen-rich substance to generate hydroxyl radicals by utilizing a catalyst filler, and active radicals and other particles in a synergistic system are used for efficiently decomposing toxic organic pollutants;
3, enabling the sewage flowing out of the NSFO of the sludge-free Fenton catalytic oxidation tank to enter a membrane bioreactor MBR module after passing through a regulating tank 2, performing sewage treatment by adopting an A2O-MBR process, and decomposing C, N, P in the sewage by using active microorganisms;
step 4, enabling the biochemically treated sewage to enter an ultrafiltration membrane component UFM (UFM), and further purifying the sewage to reach a recycling standard;
step 5, enabling concentrated solution generated by ultrafiltration membrane treatment to enter a mechanical recompression evaporation MVR, separating salt after evaporation, enabling tail gas to enter a heat accumulating type thermal oxidation tower GRTO, and oxidizing VOCs into CO2And H2O。
2. The mud-free Fenton-coupled multi-module medical wastewater treatment method according to claim 1, wherein; in the step 1, the diameter of bubbles in the pressurized dissolved air floatation is 30-50 um, and the dissolved air effect is 70-80%.
3. The mud-free Fenton-coupled multi-module medical wastewater treatment method according to claim 1, wherein; step 2, the COD range of the wastewater entering the step 2 is 1000-30000 mg/L, raw water does not need to be diluted, and non-contact type totally-closed advanced treatment is adopted.
4. The mud-free Fenton-coupled multi-module medical wastewater treatment method according to claim 1, wherein; and 3, the A2O-MBR in the step 3 is provided with a synchronous nitrogen and phosphorus removal process, two sections of reflux are set in the process, one section is that the mixed liquor in the membrane tank flows back to the anoxic tank to realize denitrification, and the other section is that the mixed liquor in the anoxic tank flows back to the anaerobic tank to realize anaerobic phosphorus release.
5. The mud-free Fenton-coupled multi-module medical wastewater treatment method according to claim 1, wherein; and 4, enabling the sewage to enter the ultrafiltration membrane component through the booster pump, and enabling water molecules, small molecular solutes and other substances to permeate the surface of the membrane under the driving of pressure difference by utilizing the screening effect and the electrostatic effect of the membrane, and intercepting the large molecular solutes to achieve the purification purpose.
6. The mud-free Fenton-coupled multi-module medical wastewater treatment method according to claim 5, wherein; in the evaporation system in the step 5, the low-temperature secondary steam generated by evaporation is recompressed by a mechanical compressor, and the pressure and the temperature of the secondary steam are increased and then enter the evaporator to be used as a heat source for reutilization.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105923888A (en) * 2016-04-21 2016-09-07 凯天环保科技股份有限公司 Method for advanced treatment of antibiotic waste water by combination of Fenton oxidation and MBR
CN110981091A (en) * 2019-12-10 2020-04-10 苏州希图环保科技有限公司 Medical wastewater comprehensive treatment system and treatment method thereof
CN111087062A (en) * 2019-12-05 2020-05-01 东南大学 A do not have mud fenton catalytic reaction jar for high enriched waste water treatment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105923888A (en) * 2016-04-21 2016-09-07 凯天环保科技股份有限公司 Method for advanced treatment of antibiotic waste water by combination of Fenton oxidation and MBR
CN111087062A (en) * 2019-12-05 2020-05-01 东南大学 A do not have mud fenton catalytic reaction jar for high enriched waste water treatment
CN110981091A (en) * 2019-12-10 2020-04-10 苏州希图环保科技有限公司 Medical wastewater comprehensive treatment system and treatment method thereof

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