CN110981091A - Medical wastewater comprehensive treatment system and treatment method thereof - Google Patents

Medical wastewater comprehensive treatment system and treatment method thereof Download PDF

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CN110981091A
CN110981091A CN201911261306.1A CN201911261306A CN110981091A CN 110981091 A CN110981091 A CN 110981091A CN 201911261306 A CN201911261306 A CN 201911261306A CN 110981091 A CN110981091 A CN 110981091A
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sludge
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wastewater
mbr
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CN110981091B (en
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王景芝
简捷
光建新
王万俊
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Suzhou Xitu Environmental Protection Technology Co ltd
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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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • 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
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • 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
    • C02F3/1268—Membrane bioreactor systems
    • 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
    • C02F3/28—Anaerobic digestion processes
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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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)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses a medical wastewater comprehensive treatment system, which comprises a grid tank, a first regulating tank connected with the grid tank, a chemical reaction tank connected with the first regulating tank, a sedimentation tank connected with the chemical reaction tank, a septic tank, a second regulating tank respectively connected with the septic tank and the sedimentation tank, a hydrolysis acidification tank connected with the second regulating tank, an MBR tank connected with the hydrolysis acidification tank, and a clean water tank with an ultrafiltration device connected with the MBR tank; the sludge tank that solid-liquid separation's mud was discharged into is carried out to the sedimentation tank, and the second equalizing basin that solid-liquid separation's sewage was discharged into is carried out to the sedimentation tank, and partial mud backward flow to hydrolysis acidification tank in the MBR pond, and partial mud is discharged into the sludge tank, and sludge dewatering handles in the sludge tank, and the filtrating gets into first equalizing basin again, and the effluent retrieval and utilization or the emission in clean water basin. The invention realizes the independent pretreatment of high-concentration medical wastewater and low-concentration wastewater such as hospital domestic sewage, canteen wastewater and the like, and then carries out advanced treatment, thereby meeting the requirements of standard discharge and reuse and reducing the treatment cost.

Description

Medical wastewater comprehensive treatment system and treatment method thereof
Technical Field
The invention belongs to the technical field of waste telephone treatment, and particularly relates to a medical wastewater comprehensive treatment system and a treatment method thereof.
Background
In the normal operation process of large hospitals, high-concentration medical wastewater generated by laboratories, operating rooms and the like is also used in addition to low-concentration wastewater generated by patients, medical workers and staff canteen wastewater. According to the different sources of raw water and different water qualities, the main pollutants in water are: COD, heavy metals (mercury and chromium), organic matters, acid, alkali, disinfectants, bacteria, viruses and the like, and the quality of raw water is relatively complex.
At present, hospitals generally adopt high-concentration wastewater generated by hospitals and low-concentration wastewater such as domestic sewage, canteens and the like to be treated together after being mixed in a regulating tank, the treatment process generally adopts biochemical and disinfection modes, and the effluent can reach the standard. However, if disinfectant in medical wastewater is directly collected and enters a biochemical pool, part of microorganisms can be killed to have adverse effect on biochemical treatment.
Disclosure of Invention
The invention aims to solve the technical problems and provides a medical wastewater comprehensive treatment system and a treatment method thereof, so that high-concentration medical wastewater and low-concentration wastewater such as hospital domestic sewage, canteen wastewater and the like are independently pretreated and then subjected to advanced treatment, the requirements of standard discharge and reuse are met, and the treatment cost is reduced. In order to achieve the purpose, the technical scheme of the invention is as follows:
the medical wastewater comprehensive treatment system comprises a grating tank, a first regulating tank, a chemical reaction tank, a sedimentation tank, a septic tank, a second regulating tank, a hydrolysis acidification tank, an MBR tank and a clear water tank, wherein the grating tank is used for connecting medical wastewater to carry out coarse filtration treatment; the sludge tank that solid-liquid separation's mud was discharged into is carried out to the sedimentation tank, and the second equalizing basin that solid-liquid separation's sewage was discharged into is carried out to the sedimentation tank, and partial mud backward flow to hydrolysis acidification tank in the MBR pond, and partial mud is discharged into the sludge tank, and sludge dewatering handles in the sludge tank, and the filtrating gets into first equalizing basin again, and the effluent retrieval and utilization or the emission in clean water basin.
Specifically, the chemical reaction tank is used for carrying out precipitation reaction according to different COD concentrations.
Specifically, hydrolysis and acidification reactions of anaerobic microorganisms are performed in the hydrolysis acidification tank.
Specifically, an anoxic tank and an aerobic tank are arranged between the hydrolysis acidification tank and the MBR tank, and part of mixed liquor in the aerobic tank flows back to the anoxic tank for nitrification and denitrification.
The comprehensive medical wastewater treatment method comprises the following steps:
s1, preprocessing: conveying the medical wastewater filtered by the grid pond to a first regulating pond, and pumping the wastewater into a chemical reaction pond by a lifting pump after the liquid level in the first regulating pond reaches a set value;
s2, carrying out precipitation reaction in the chemical reaction tank according to different COD concentrations;
s3, precipitating for 40-60min in the sedimentation tank, discharging the precipitated sludge subjected to solid-liquid separation into a sludge tank, dehydrating the sludge, and allowing the supernatant of the sludge tank to enter a first regulating tank; discharging the sewage subjected to solid-liquid separation in the sedimentation tank into a second regulating tank;
s4, hospital domestic sewage and canteen wastewater treated by the septic tank are introduced into the second regulating tank;
s5, biochemical treatment, namely conveying the wastewater in the second regulating tank to a hydrolysis acidification tank, and decomposing most of macromolecular organic matters in the water into micromolecular organic matters under the action of microorganisms;
s6, further filtering water by an MBR membrane module, returning part of sludge in the MBR tank to a hydrolysis acidification tank, discharging part of sludge into a sludge tank, dewatering the sludge, and returning filtrate into a first regulating tank;
and S7, enabling the effluent of the MBR tank to enter a clean water tank, connecting the clean water tank with an ultrafiltration device for further deep filtration, and recycling or discharging the effluent after ultrafiltration.
Specifically, in step S2, when the COD concentration in the wastewater is not high, sequentially delivering alkali, PAC, and PAM to the chemical reaction tank, controlling the sufficient reaction time to 30-60min, then adding NaClO, adding a reducing agent to remove the remaining NaClO, and discharging to the sedimentation tank;
when the COD concentration in the raw water is higher, acid and FeSO are added into the chemical reaction tank in sequence4、H2O2Selecting whether to add a Fenton reagent according to the COD concentration of raw water, removing most organic matters through a Fenton oxidation reaction, and discharging the organic matters into a sedimentation tank after coagulation, flocculation, disinfection and reduction reactions;
specifically, in step S5, the water outlet end of the hydrolysis acidification tank flows into the anoxic tank and the aerobic tank in sequence;
meanwhile, part of mixed liquor in the aerobic tank flows back to the anoxic tank, and most of pollutants such as nitrogen, phosphorus, COD (chemical oxygen demand), bacteria and the like in water are removed under the alternate action of nitrification and denitrification;
specifically, in step S1, the medical wastewater to be treated first passes through the grid pond to trap floating objects and large-particle pollutants in the water, and then enters the first regulating pond.
Specifically, in step S2, when the raw water has a high COD concentration, dilute sulfuric acid is first added to adjust the pH of the wastewater to 2 to 3, and FeSO is added under acidic conditions4、H2O2Adding alkali to regulate the pH value of the waste water to 8-9, and then adding PAC and PAM to carry out coagulation and flocculation reactions.
Compared with the prior art, the medical wastewater comprehensive treatment system and the treatment method thereof have the beneficial effects that:
the hydrolysis acidification tank degrades macromolecular organic matters in water into micromolecular organic matters through hydrolysis and acidification reactions of anaerobic microorganisms, so that the biodegradability of the wastewater is improved;
the effluent of the hydrolysis acidification tank sequentially enters an anoxic-aerobic tank, and the mixed liquor of the aerobic tank flows back to the anoxic tank, wherein the reflux ratio of the mixed liquor is 100-200%. Under the nitrification-denitrification action of microorganisms, most pollutants such as degradable organic matters, nitrogen, phosphorus, partial bacteria and the like in water are removed;
an MBR tank is adopted to replace a traditional secondary sedimentation tank, so that the occupied area is reduced, the concentration of returned sludge is improved, meanwhile, an MBR membrane plays a role in intercepting, solid-liquid separation is realized, and water outlet is ensured;
the effluent of the MBR tank is further subjected to advanced treatment in an ultrafiltration device, the surface of the ultrafiltration membrane has the comprehensive effects of mechanical screening, membrane pore retardation and membrane surface and membrane pore adsorption, most suspended matters, macromolecular inorganic salt ions and bacteria in the water are removed, and the effluent quality is recycled or discharged after reaching the standard;
the high-concentration medical wastewater, the hospital domestic sewage and the dining room wastewater are respectively pretreated, so that pollutants in the high-concentration medical wastewater can be effectively removed, and the influence of chloride ions and part of harmful bacteria in the medical wastewater on biochemical treatment is reduced.
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FIG. 1 is a schematic flow chart of an embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example 1:
referring to fig. 1, the present embodiment is a medical wastewater comprehensive treatment system, which includes a grid tank for connecting medical wastewater to perform coarse filtration treatment, a first regulation tank for connecting the grid tank, a chemical reaction tank for connecting the first regulation tank, a sedimentation tank for connecting the chemical reaction tank, a septic tank for connecting domestic sewage to canteen wastewater to perform treatment, a second regulation tank for respectively connecting the septic tank and the sedimentation tank, a hydrolysis acidification tank for connecting the second regulation tank, an MBR tank for connecting the hydrolysis acidification tank, and a clear water tank with an ultrafiltration device for connecting the MBR tank; the sludge tank that solid-liquid separation's mud was discharged into is carried out to the sedimentation tank, and the second equalizing basin that solid-liquid separation's sewage was discharged into is carried out to the sedimentation tank, and partial mud backward flow to hydrolysis acidification tank in the MBR pond, and partial mud is discharged into the sludge tank, and sludge dewatering handles in the sludge tank, and the filtrating gets into first equalizing basin again, and the effluent retrieval and utilization or the emission in clean water basin.
And (4) dehydrating the sludge in the sludge tank through a filter press.
An anoxic tank and an aerobic tank are arranged between the hydrolysis acidification tank and the MBR tank, and part of mixed liquor in the aerobic tank flows back to the anoxic tank for nitrification and denitrification.
And carrying out precipitation reaction in the chemical reaction tank according to different COD concentrations.
The hydrolysis acidification tank is used for carrying out hydrolysis and acidification reactions by anaerobic microorganisms.
Sewage is intercepted in the MBR tank, and solid-liquid separation is realized.
Example 2:
referring to fig. 1, the embodiment is a method for comprehensive treatment of medical wastewater, comprising the following steps:
s1, preprocessing: conveying the medical wastewater filtered by the grid pond to a first regulating pond, and pumping the wastewater into a chemical reaction pond by a lifting pump after the liquid level in the first regulating pond reaches a set value;
s2, carrying out precipitation reaction in the chemical reaction tank according to different COD concentrations;
when the COD concentration in the wastewater is not high, sequentially delivering alkali, PAC and PAM to a chemical reaction tank, controlling the sufficient reaction time to be 30-60min, then adding NaClO for disinfection treatment, adding a reducing agent to remove the residual NaClO, avoiding the adverse effect of chloride ions on the subsequent biochemical treatment, and discharging the residual NaClO into a sedimentation tank;
when the COD concentration in the raw water is higher, acid and FeSO are added into the chemical reaction tank in sequence4、H2O2Selecting whether to add a Fenton reagent according to the COD concentration of raw water, removing most organic matters through a Fenton oxidation reaction, and discharging the organic matters into a sedimentation tank after coagulation, flocculation, disinfection and reduction reactions;
s3, precipitating for 40-60min in the sedimentation tank, discharging the precipitated sludge subjected to solid-liquid separation into a sludge tank, dehydrating the sludge through a filter press, and then treating outside, wherein the supernatant of the sludge tank enters a first regulating tank; discharging the sewage subjected to solid-liquid separation in the sedimentation tank into a second regulating tank;
s4, hospital domestic sewage and canteen wastewater treated by the septic tank are introduced into the second regulating tank;
s5, biochemical treatment, namely conveying the wastewater in the second regulating tank to a hydrolysis acidification tank, and decomposing most of macromolecular organic matters in the water into micromolecular organic matters under the action of microorganisms to improve the biodegradability of the wastewater; the water outlet end of the hydrolysis acidification tank flows into the anoxic tank and the aerobic tank in sequence;
meanwhile, part of mixed liquor in the aerobic tank flows back to the anoxic tank, and most of pollutants such as nitrogen, phosphorus, COD (chemical oxygen demand), bacteria and the like in water are removed under the alternate action of nitrification and denitrification;
s6, enabling the effluent of the aerobic tank to enter an MBR tank, and further filtering the water by an MBR membrane module;
part of sludge in the MBR tank flows back to the hydrolysis acidification tank to ensure the sludge concentration of a biochemical system, part of sludge is discharged into the sludge tank, the sludge is dehydrated by a filter press and then subjected to outsourcing treatment, and filtrate enters the first regulating tank again;
and S7, enabling the effluent of the MBR tank to enter a clean water tank, connecting the clean water tank with an ultrafiltration device for further deep filtration, and recycling or discharging the effluent after ultrafiltration.
In step S1, the medical wastewater to be treated first passes through the grid pond to trap floating materials and large-particle pollutants in the water, and then enters the first regulating pond.
In step S2, when the raw water has a high COD concentration, dilute sulfuric acid is added to adjust the pH of the wastewater to 2-3, and FeSO is added under acidic conditions4、H2O2And then adding alkali to adjust the pH value of the wastewater to be 8-9, then adding PAC and PAM to carry out coagulation and flocculation reactions, wherein the Fenton reagent has stronger oxidability and has better treatment effect on organic wastewater which is difficult to act by biological degradation or common chemical oxidants, and the action mechanism is as follows:
Figure BDA0002311670020000041
2Fe2++H2O2→2Fe3++2OH-
Fe3++H2O2→Fe2++HO2·+H+
HO2·+H2O2→O2+H2O+·OH+
RH+·OH+→R·+H2O
R·+O2→ROO+→……→CO2+H2O
meanwhile, when alkali is added to adjust the pH of the wastewater, Fe (OH) exists3Colloid appears, which has flocculation function and can greatly reduce suspended matters in water.
Fe3++3OH-→Fe(OH)3↓
When the embodiment is applied, the hydrolysis acidification tank degrades macromolecular organic matters in water into micromolecular organic matters through hydrolysis and acidification reactions of anaerobic microorganisms, so that the biodegradability of wastewater is improved;
the effluent of the hydrolysis acidification tank sequentially enters an anoxic-aerobic tank, and the mixed liquor of the aerobic tank flows back to the anoxic tank, wherein the reflux ratio of the mixed liquor is 100-200%. Under the nitrification-denitrification action of microorganisms, most pollutants such as degradable organic matters, nitrogen, phosphorus, partial bacteria and the like in water are removed;
an MBR tank is adopted to replace a traditional secondary sedimentation tank, so that the occupied area is reduced, the concentration of returned sludge is improved, meanwhile, an MBR membrane plays a role in intercepting, solid-liquid separation is realized, and water outlet is ensured;
the effluent of the MBR tank is further subjected to advanced treatment in an ultrafiltration device, the surface of the ultrafiltration membrane has the comprehensive effects of mechanical screening, membrane pore retardation and membrane surface and membrane pore adsorption, most suspended matters, macromolecular inorganic salt ions and bacteria in the water are removed, and the effluent quality is recycled or discharged after reaching the standard;
the high-concentration medical wastewater, the hospital domestic sewage and the dining room wastewater are respectively pretreated, so that pollutants in the high-concentration medical wastewater can be effectively removed, and the influence of chloride ions and part of harmful bacteria in the medical wastewater on biochemical treatment is reduced.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims (9)

1. Medical waste water integrated processing system, its characterized in that: the device comprises a grating tank for connecting medical wastewater to perform coarse filtration treatment, a first regulating tank for connecting the grating tank, a chemical reaction tank for connecting the first regulating tank, a sedimentation tank for connecting the chemical reaction tank, a septic tank for connecting domestic sewage and canteen wastewater to perform treatment, a second regulating tank for respectively connecting the septic tank and the sedimentation tank, a hydrolysis acidification tank for connecting the second regulating tank, an MBR tank for connecting the hydrolysis acidification tank, and a clear water tank with an ultrafiltration device for connecting the MBR tank; the sludge tank that solid-liquid separation's mud was discharged into is carried out to the sedimentation tank, and the second equalizing basin that solid-liquid separation's sewage was discharged into is carried out to the sedimentation tank, and partial mud backward flow to hydrolysis acidification tank in the MBR pond, and partial mud is discharged into the sludge tank, and sludge dewatering handles in the sludge tank, and the filtrating gets into first equalizing basin again, and the effluent retrieval and utilization or the emission in clean water basin.
2. The integrated medical wastewater treatment system according to claim 1, wherein: and carrying out precipitation reaction in the chemical reaction tank according to different COD concentrations.
3. The integrated medical wastewater treatment system according to claim 1, wherein: the hydrolysis acidification tank is used for carrying out hydrolysis and acidification reactions by anaerobic microorganisms.
4. The integrated medical wastewater treatment system according to claim 1, wherein: an anoxic tank and an aerobic tank are arranged between the hydrolysis acidification tank and the MBR tank, and part of mixed liquor in the aerobic tank flows back to the anoxic tank for nitrification and denitrification.
5. The medical wastewater comprehensive treatment method is characterized by comprising the following steps:
s1, preprocessing: conveying the medical wastewater filtered by the grid pond to a first regulating pond, and pumping the wastewater into a chemical reaction pond by a lifting pump after the liquid level in the first regulating pond reaches a set value;
s2, carrying out precipitation reaction in the chemical reaction tank according to different COD concentrations;
s3, precipitating for 40-60min in the sedimentation tank, discharging the precipitated sludge subjected to solid-liquid separation into a sludge tank, dehydrating the sludge, and allowing the supernatant of the sludge tank to enter a first regulating tank; discharging the sewage subjected to solid-liquid separation in the sedimentation tank into a second regulating tank;
s4, hospital domestic sewage and canteen wastewater treated by the septic tank are introduced into the second regulating tank;
s5, biochemical treatment, namely conveying the wastewater in the second regulating tank to a hydrolysis acidification tank, and decomposing most of macromolecular organic matters in the water into micromolecular organic matters under the action of microorganisms;
s6, further filtering water by an MBR membrane module, returning part of sludge in the MBR tank to a hydrolysis acidification tank, discharging part of sludge into a sludge tank, dewatering the sludge, and returning filtrate into a first regulating tank;
and S7, enabling the effluent of the MBR tank to enter a clean water tank, connecting the clean water tank with an ultrafiltration device for further deep filtration, and recycling or discharging the effluent after ultrafiltration.
6. The integrated medical wastewater treatment method according to claim 5, characterized in that: in step S2, when the COD concentration in the wastewater is not high, sequentially delivering alkali, PAC and PAM to a chemical reaction tank, controlling the sufficient reaction time to be 30-60min, then adding NaClO, adding a reducing agent to remove the residual NaClO, and discharging the NaClO into a sedimentation tank;
when the COD concentration in the raw water is higher, acid and FeSO are added into the chemical reaction tank in sequence4、H2O2Whether a Fenton reagent is added or not is selected according to the COD concentration of raw water, most organic matters are removed through Fenton oxidation reaction, and then the organic matters are discharged into a sedimentation tank after coagulation, flocculation, disinfection and reduction reaction.
7. The integrated medical wastewater treatment method according to claim 5, characterized in that: in the step S5, the water outlet end of the hydrolysis acidification tank flows into the anoxic tank and the aerobic tank in sequence;
meanwhile, part of the mixed liquid in the aerobic tank flows back to the anoxic tank, and most of pollutants such as nitrogen, phosphorus, COD (chemical oxygen demand), bacteria and the like in the water are removed under the alternate action of nitrification and denitrification.
8. The integrated medical wastewater treatment method according to claim 5, characterized in that: in step S1, the medical wastewater to be treated first passes through the grid pond to trap floating objects and large-particle pollutants in the water, and then enters the first regulating pond.
9. The integrated medical wastewater treatment method according to claim 5, characterized in that: in step S2, when the raw water has a high COD concentration, dilute sulfuric acid is added to adjust the pH of the wastewater to 2-3, and FeSO is added under acidic conditions4、H2O2Adding alkali to regulate the pH value of the waste water to 8-9, and then adding PAC and PAM to carry out coagulation and flocculation reactions.
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CN111777267A (en) * 2020-06-22 2020-10-16 东南大学 Mud-free Fenton coupling multi-module medical wastewater treatment method
CN112159026A (en) * 2020-08-18 2021-01-01 南京中微纳米功能材料研究院有限公司 Treatment method for industrial sewage difficult to degrade
CN112279461A (en) * 2020-10-19 2021-01-29 沧州冀环威立雅环境服务有限公司 High-salinity sewage treatment process for hazardous waste industry
CN113620535A (en) * 2021-08-25 2021-11-09 产学研(广州)环境服务有限公司 Composite medical wastewater treatment system and method
CN114749407A (en) * 2022-04-08 2022-07-15 安徽富乐德科技发展股份有限公司 Ultrahigh-pressure physical film removing method for semiconductor component
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CN114749407A (en) * 2022-04-08 2022-07-15 安徽富乐德科技发展股份有限公司 Ultrahigh-pressure physical film removing method for semiconductor component
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