CN107043199B - Hospital wastewater treatment and resource recovery method - Google Patents
Hospital wastewater treatment and resource recovery method Download PDFInfo
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- CN107043199B CN107043199B CN201710313790.2A CN201710313790A CN107043199B CN 107043199 B CN107043199 B CN 107043199B CN 201710313790 A CN201710313790 A CN 201710313790A CN 107043199 B CN107043199 B CN 107043199B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 29
- 238000011084 recovery Methods 0.000 title claims abstract description 28
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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
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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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
- 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
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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
- 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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention relates to a hospital wastewater treatment and resource recovery method, which can effectively solve the problems that the prior hospital wastewater treatment process generally has the defects of unqualified nitrogen and phosphorus removal, no harmless stabilization treatment of residual sludge and no consideration of effluent water recycling and resource recovery, and adopts the technical proposal that the effluent water of a mixing tank enters an A/O/A biological treatment system to further remove nitrogen, phosphorus and organic matters, the effluent water of the A/O/A biological treatment system enters an MBR (membrane bioreactor) to carry out enhanced nitrogen and phosphorus removal treatment, simultaneously, sludge in the MBR flows back to the A/O/A biological treatment system, the effluent water of the MBR enters an ultraviolet disinfection tank to kill germs in the water, the effluent water of the ultraviolet disinfection tank enters a clean water tank for temporary storage, most of the effluent water can be used for lawn greening, toilet flushing and the like, and the rest of the effluent can reach the standard and be discharged, the resource and energy recovery in the hospital, meanwhile, the purposes of harmlessness, reclamation and reduction of byproducts in the hospital wastewater treatment process are realized, and the method is an innovation on the wastewater treatment method.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a hospital wastewater treatment and resource recovery method.
Background
The hospital wastewater mainly comprises sewage discharged from places such as hospital departments, outpatient rooms, laboratories, canteens, bathrooms, toilets, pharmacy rooms, laundry rooms and the like. The wastewater contains a large amount of organic matters, nitrogen, phosphorus and other components, and also contains a large amount of harmful microorganisms such as germs, viruses, parasites and the like, and if the wastewater is discharged into a water body without effective treatment, the surrounding environment can be seriously affected, and the health of people is endangered.
In order to ensure that hospital wastewater does not cause harm to social life of people, the state sets up strict discharge standards for hospital wastewater, but most of hospital wastewater discharge cannot meet the national standards due to inadequate supervision, and in recent years, a plurality of companies develop new hospital wastewater treatment processes. For example, the invention patent publication No. CN103319056A, namely a Hospital wastewater treatment system, proposes a hospital wastewater treatment process comprising: the wastewater flows to a grid well, a pre-disinfection tank, a septic tank, a pre-aeration regulating tank, an anoxic tank, a biological contact oxidation tank, a vertical flow sedimentation tank, a quantitative tank, a water purifying device, a contact disinfection tank and a dechlorination tank which are sequentially communicated through pipelines, and the treated hospital sewage is discharged after passing through the dechlorination tank. The invention patent of publication No. CN104944707A, Hospital sewage treatment system and method, provides a process comprising: the sewage sequentially passes through the grating, the hydrolysis acidification tank, the anaerobic tank, the aerobic tank and the MBR reactor, and the treated effluent is discharged from the MBR reactor. Through careful analysis, the process of CN103319056A has the problems of unstable denitrification and dephosphorization effects and substandard effluent suspended matters, while the process of CN104944707A has the problems of unstable denitrification and dephosphorization and overproof effluent coliform groups.
At present, the existing hospital wastewater treatment process generally has the defects of unqualified denitrification and dephosphorization, no harmless stabilization treatment of excess sludge and no consideration of effluent reuse and resource recovery, and the technical problem of remarkably reducing the wastewater treatment cost is urgently needed to be solved by recycling the resources as far as possible on the premise of ensuring the qualified discharge of wastewater treatment and changing waste into valuable.
Disclosure of Invention
In view of the above situation, the present invention provides a method for hospital wastewater treatment and resource recovery, which can effectively solve the problems of the existing hospital wastewater treatment process that nitrogen and phosphorus removal do not meet the standards, residual sludge does not undergo harmless stabilization treatment, and effluent recycling and resource recovery are not considered.
The technical scheme includes that the effluent of a mixing tank enters an A/O/A biological treatment system to further remove nitrogen, phosphorus and organic matters, the effluent of the A/O/A biological treatment system enters an MBR (membrane bioreactor) to carry out enhanced nitrogen and phosphorus removal treatment, and meanwhile, sludge in the MBR flows back to the A/O/A biological treatment system to supplement the sludge concentration and microorganism types of the biological system. The effluent of the MBR enters an ultraviolet disinfection tank to kill germs in water, the effluent of the ultraviolet disinfection tank enters a clean water tank for temporary storage, most of the effluent can be used for lawn greening, toilet flushing and the like, and the rest of the effluent can reach the discharge standard. And simultaneously pumping residual sludge of the MBR into a sludge concentration tank, returning the concentrated solution to the mixing tank, allowing the concentrated sludge to enter a sludge digestion tank for anaerobic digestion treatment, allowing biogas generated in the digestion tank to be used for heating systems of residents and hospitals, dehydrating the residual digested sludge, carrying out outward transport treatment, and returning the sludge dehydration press filtrate to the mixing tank for continuous treatment after recycling nitrogen and phosphorus.
The method realizes the recovery of resources (clear water and nitrogen and phosphorus elements after treatment) and energy (methane) in the hospital wastewater, simultaneously realizes the purposes of harmlessness, reclamation and reduction of byproducts (residual sludge) in the hospital wastewater treatment process, and is an innovation on the wastewater treatment method.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention comprises the following steps:
1) supernatant wastewater from a septic tank of a hospital is subjected to fine grating to remove a large amount of fine particles and suspended matters, so that subsequent pipeline blockage and normal operation of treatment equipment are avoided;
2) the wastewater filtered by the fine grid enters a mixing tank for wastewater conditioning;
3) the effluent of the mixing tank enters an anaerobic tank (A) of an A/O/A biological treatment system, phosphorus accumulating bacteria in sludge reflowing from an MBR (membrane bioreactor) release a large amount of phosphorus under anaerobic conditions and store internal carbon sources by degrading organic matters in wastewater; wastewater firstly enters an anaerobic tank (A) of an A/O/A biological treatment system to be mixed with sludge refluxed by an MBR, and phosphorus accumulating bacteria in the sludge release a large amount of phosphorus under anaerobic conditions and in the presence of a large amount of organic matters and store an internal carbon source;
4) the effluent of the anaerobic tank enters an aerobic tank (O) of an A/O/A biological treatment system, polypropylene ring packing is filled in the aerobic tank, nitrifying bacteria can be enriched on the packing, the abundance of the nitrifying bacteria is improved, under the aerobic condition, the activated sludge degrades organic matters in water and realizes activated sludge proliferation, the organic matters are transferred into activated sludge microorganisms to realize the removal of the organic matters in the wastewater, the nitrifying bacteria convert ammonia nitrogen into nitrate nitrogen to realize the effect of removing the ammonia nitrogen, the phosphorus accumulating bacteria excessively absorb phosphate in the wastewater by using an internal carbon source stored in the body, and the phosphate is transferred into the phosphorus accumulating bacteria to realize the dephosphorization in the wastewater;
5) the effluent of the aerobic tank enters an anoxic tank (A) of an A/O/A biological treatment system, the anoxic tank receives wastewater supplied by the anaerobic tank, the effluent provides part of carbon source for the anoxic tank, and denitrifying bacteria in the anoxic tank convert nitrate nitrogen into nitrogen gas to be discharged into air by using the carbon source under the anoxic condition, so that the denitrification of the wastewater is realized;
6) the effluent of the anoxic tank enters an MBR (membrane bioreactor), and the majority of microorganisms in the water can be intercepted by the microporous filtration action of an MBR membrane, so that the turbidity and suspended matters of the effluent of the MBR can reach the standard;
7) MBR effluent enters an ultraviolet disinfection tank, under the radiation action of ultraviolet rays in the tank, residual microorganisms in the water are killed, the effluent coliform group is ensured to reach the standard, the effluent of the ultraviolet disinfection tank enters a clean water tank for temporary storage, most of clean water is used for flushing toilets and greening in hospitals, and the redundant clean water is discharged after reaching the standard;
8) the residual sludge in the MBR is periodically sent to a sludge concentration tank to realize sludge concentration and reduce the sludge volume, and the supernatant of the sludge concentration tank flows back to the mixing tank for continuous treatment;
9) the sludge concentrated by the sludge concentration tank enters a sludge digestion tank, organic matters in the sludge are converted into methane under the action of anaerobic digestion bacteria, sludge reduction is realized, the digested sludge is harmlessly stabilized under the long-term high-temperature condition of the sludge digestion tank, and the methane generated by the sludge digestion tank can be collected and used as clean fuel for heating residents and heating the digestion tank in winter;
10) after being digested in the sludge digestion tank, the sludge enters a sludge dewatering machine for treatment, and the sludge is dewatered until the water content is below 80 percent and then is transported out for treatment;
11) the sludge dehydrator press filtrate enters a nitrogen and phosphorus recovery tank, and in the nitrogen and phosphorus recovery tank, disodium hydrogen phosphate and magnesium chloride solution are added for mixing treatment, so that the molar ratio of magnesium, nitrogen and phosphorus in the wastewater after adding the reagent is 1:1:0.8-1.2:1:1, and nitrogen and phosphorus in the water are converted into struvite (Mg (NH)4）PO4•6H2O), the struvite is used as a high-efficiency slow-release fertilizer for landscaping and farmland fertilization, and the supernatant of the nitrogen and phosphorus recovery tank flows back to the mixing tank for further treatment.
In order to guarantee the use effect, thin grid width be 1~5mm, get rid of a large amount of tiny granule and suspended solid in the waste water, avoid follow-up pipeline to block up, guarantee treatment facility's normal operating.
And the sludge reflux ratio of the MBR to the anaerobic tank is 30-100%.
The aerobic tank (O) is filled with polypropylene ring fillers with the tank capacity of 30-70%, nitrobacteria can be enriched on the fillers, the abundance of the nitrobacteria is improved, under the aerobic condition, the active sludge can efficiently degrade organic matters in water, and meanwhile, the nitrobacteria carry out nitrification to convert ammonia nitrogen into nitrate nitrogen, so that the purposes of removing the organic matters and removing the ammonia nitrogen are achieved.
5% -20% of wastewater in the anaerobic tank is shunted to the anoxic tank, so that a carbon source can be provided for denitrifying bacteria in the anoxic tank, the effect of converting nitrate nitrogen into nitrogen by the denitrifying bacteria is ensured, and the aim of denitrifying wastewater is fulfilled.
In the MBR (membrane bioreactor), an MBR membrane is a microfiltration membrane or an ultrafiltration membrane, and the membrane component is in a plate type or hollow fiber type; under the aerobic condition, the high-concentration activated sludge enriched in the tank can further reduce organic matters in water and further strengthen deamination nitrogen, and the filtering action of the MBR membrane can remove most of sludge and suspended matters, so that the quality of the effluent water is stable and reliable.
Ultraviolet disinfection pond ultraviolet wavelength be between 240~280nm, ultraviolet radiation time is not less than 10s, because of MBR membrane goes out the water turbidity low, is favorable to adopting ultraviolet disinfection, adopts ultraviolet disinfection can not only thoroughly kill aquatic microorganism and has still avoided the complex operation and the potential safety hazard of chlorine disinfection technology, goes out the water and gets into the clean water basin and keep in after the disinfection, clean water basin water can be used to towards lavatory and afforest.
The concentration time of the sludge concentration tank is less than 6 hours, and the temperature of the sludge digestion tank is 30-60 ℃; high-concentration sludge in the MBR enters a sludge digestion tank after being concentrated by a sludge concentration tank, anaerobic bacteria in the sludge digestion tank can convert organic matters in the sludge into methane, the sludge digestion tank can kill harmful bacteria to realize harmless stabilization of the sludge, the sludge quantity after digestion is greatly reduced to realize sludge reduction, and the methane can be used as fuel for heating of the digestion tank in winter or heat supply of residents.
Example 1
1) Supernatant wastewater from a septic tank of a hospital is subjected to a 2mm fine grid to remove a large amount of fine particles and suspended matters, so that subsequent pipeline blockage and normal operation of treatment equipment are avoided;
2) the wastewater filtered by the fine grid of 2mm enters a mixing tank for wastewater conditioning;
3) the effluent of the mixing tank enters an anaerobic tank (A) of an A/O/A biological treatment system, the anaerobic tank of the A/O/A biological treatment system receives activated sludge with 50 percent of reflux ratio of an MBR (membrane bioreactor), phosphorus-accumulating bacteria in the sludge release phosphorus under anaerobic conditions and store internal carbon sources by degrading organic matters in wastewater;
4) the effluent of the anaerobic tank enters an aerobic tank (O) of an A/O/A biological treatment system, polypropylene ring packing with the tank capacity of 50 percent is filled in the aerobic tank, nitrifying bacteria can be enriched on the packing, the abundance of the nitrifying bacteria is improved, under the aerobic condition, the organic matters in the water are degraded by the activated sludge, the activated sludge is proliferated, the organic matters are transferred into the activated sludge microorganisms, the organic matters are removed from the wastewater, the nitrifying bacteria convert the ammonia nitrogen into nitrate nitrogen to remove the ammonia nitrogen, the phosphorus accumulating bacteria absorb the phosphate in the wastewater by using an internal excess carbon source stored in the body, and the phosphate is transferred into the phosphorus accumulating bacteria to remove the phosphorus in the wastewater;
5) the effluent of the aerobic tank enters an anoxic tank (A) of an A/O/A biological treatment system, the anoxic tank receives 10% of wastewater shunted by the anaerobic tank, the wastewater provides part of carbon source for the anoxic tank, and denitrifying bacteria in the anoxic tank convert nitrate nitrogen into nitrogen to be discharged into air by utilizing the carbon source under the anoxic condition, so that the denitrification of the wastewater is realized;
6) the effluent of the anoxic tank enters an MBR (membrane bioreactor), a plate-type microfiltration membrane component is arranged in the MBR, and meanwhile, the 0.01-5um microfiltration effect of the MBR membrane intercepts most microorganisms to ensure that the turbidity and suspended matters of the effluent of the MBR reach the standard;
7) the MBR effluent enters an ultraviolet disinfection tank, the disinfection tank is disinfected by using 254nm ultraviolet radiation for 10s to ensure that the effluent coliform group reaches the standard, the effluent of the ultraviolet disinfection tank enters a clean water tank for temporary storage, most of clean water is used for flushing a toilet and greening in a hospital, and the redundant clean water can be directly discharged;
8) residual sludge generated by the MBR enters a sludge concentration tank to be concentrated for 4 hours, so that the sludge concentration is realized, the sludge volume is reduced, and supernatant of the sludge concentration tank flows back to the mixing tank to be continuously treated;
9) the sludge concentrated by the sludge concentration tank enters a 30-degree sludge digestion tank, organic matters in the sludge are converted into methane under the action of anaerobic digestion bacteria, so that sludge reduction is realized, and the digested sludge is harmlessly stabilized under the long-term high-temperature condition of the sludge digestion tank; biogas generated by the sludge digestion tank can be used as clean fuel for heating residents and heating the digestion tank in winter after being collected;
10) after being digested in the sludge digestion tank, the sludge enters a sludge dewatering machine for treatment, and the sludge is dewatered until the water content is below 80 percent and then is transported out for treatment;
11) the sludge dehydrator press filtrate enters a nitrogen and phosphorus recovery tank, and is treated by adding disodium hydrogen phosphate and magnesium chloride solution in the nitrogen and phosphorus recovery tank to ensure that the molar ratio of magnesium, nitrogen and phosphorus in the wastewater after adding the reagent is 1:1:0.8, so that nitrogen and phosphorus in the wastewater are converted into struvite (Mg (NH)4）PO4•6H2O), the struvite is used as a high-efficiency slow-release fertilizer for landscaping and farmland fertilization, and the supernatant of the nitrogen and phosphorus recovery tank flows back to the mixing tank for further treatment.
The waste water treatment device has the use condition that after being collected, the waste water is treated by the fine grating to remove some fine particles and suspended matters in the water, and then the waste water enters the mixing tank to be treated by the waste water conditioning. And the effluent of the mixing tank enters an A/O/A biological treatment system to further remove nitrogen, phosphorus and organic matters, the effluent of the A/O/A biological treatment system enters an MBR (membrane bioreactor) to carry out enhanced nitrogen and phosphorus removal treatment, and simultaneously sludge in the MBR flows back to the A/O/A biological treatment system to supplement the sludge concentration and microorganism types of the biological system. The effluent of the MBR enters an ultraviolet disinfection tank to kill germs in water, the effluent of the ultraviolet disinfection tank enters a clean water tank for temporary storage, most of the effluent can be used for lawn greening, toilet flushing and the like, and the rest of the effluent can reach the discharge standard. And simultaneously pumping residual sludge of the MBR into a sludge concentration tank, allowing the concentrated sludge to enter an anaerobic digestion tank for digestion treatment, performing sludge filter pressing on the digested sludge, recovering nitrogen and phosphorus elements from the filter pressing liquid, and refluxing the filter pressing liquid and sludge concentrated supernatant liquid together to a mixing tank for retreatment. The marsh gas generated by the digestion tank can be used as a clean fuel for heating systems of resident life and hospitals, the residual digested sludge is subjected to sludge dehydration and then is transported outside, and the recovered nitrogen and phosphorus can be used as an organic slow release fertilizer for landscaping and farmlands.
Compared with the prior art, the invention has the following advantages:
1. the hospital wastewater adopts an improved biological treatment system A/O/A, nitrobacteria can be enriched on the filler of an aerobic tank of the system, the abundance of the nitrobacteria is improved, in addition, phosphorus removal treatment is firstly carried out, then nitrogen removal is carried out, meanwhile, the wastewater in an anaerobic tank is shunted to an anoxic tank to provide an organic carbon source for the denitrifying bacteria, the phosphorus removal and the nitrogen removal are independently separated, and the purposes of high-efficiency nitrogen removal, phosphorus removal and COD removal can be realized.
2. The residual sludge generated in the wastewater treatment process can realize the harmlessness, stabilization, reduction and reclamation of the sludge through sludge digestion treatment.
3. MBR effluent is further disinfected by ultraviolet rays, so that the effect is good, and the problems that the traditional chlorine disinfection operation is complicated and harmful substances are easily generated (carcinogenesis, teratogenesis and mutation) are solved.
4. The treated waste water reaches the relevant reclaimed water reuse standard and can be reused for flushing toilets and landscaping to reduce the consumption of tap water.
5. The biogas generated by the sludge digestion treatment can be used as a clean fuel for supplying heat to residents and heating a digestion tank in winter, so that the use of municipal natural gas can be reduced.
6. The struvite produced by recycling nitrogen and phosphorus elements in the wastewater can be used as a high-efficiency slow-release fertilizer for landscaping and farmlands, and the using amount of the fertilizer is reduced.
7. The recycling of resources (clear water and nitrogen and phosphorus elements after treatment) and energy (methane) in the hospital wastewater is realized, and the purposes of harmlessness, reclamation and reduction of byproducts (residual sludge) in the hospital wastewater treatment process are realized.
The invention not only realizes the harmless treatment of the hospital wastewater, but also realizes the effective recovery and utilization of resources and energy sources in the hospital wastewater, improves the treatment effect of the hospital wastewater, improves the working environment and the surrounding environment of the hospital, has small overall floor occupation, lower investment and operation cost, is easy to realize the equipment, is preferably suitable for the treatment of the hospital wastewater, and is actually suitable for the treatment of domestic sewage of medium and small-scale towns and new rural areas, thereby having better application prospect.
Claims (8)
1. A hospital wastewater treatment and resource recovery method is characterized by comprising the following steps:
1) supernatant wastewater from a septic tank of a hospital is subjected to fine grating to remove a large amount of fine particles and suspended matters, so that subsequent pipeline blockage and normal operation of treatment equipment are avoided;
2) the wastewater filtered by the fine grid enters a mixing tank for wastewater conditioning;
3) the effluent of the mixing tank enters an anaerobic tank of an A/O/A biological treatment system, phosphorus accumulating bacteria in sludge reflowing from an MBR (membrane bioreactor) release a large amount of phosphorus under anaerobic conditions and store internal carbon sources by degrading organic matters in wastewater; wastewater firstly enters an anaerobic tank of an A/O/A biological treatment system to be mixed with sludge refluxed by an MBR (membrane bioreactor), and phosphorus-accumulating bacteria in the sludge release a large amount of phosphorus under anaerobic conditions and in the presence of a large amount of organic matters and store an internal carbon source;
4) the effluent of the anaerobic tank enters an aerobic tank of an A/O/A biological treatment system, polypropylene ring packing is filled in the aerobic tank, nitrifying bacteria can be enriched on the packing, the abundance of the nitrifying bacteria is improved, under the aerobic condition, the activated sludge degrades organic matters in water and realizes the proliferation of the activated sludge, the organic matters are transferred into activated sludge microorganisms to realize the removal of the organic matters in the wastewater, the nitrifying bacteria convert ammonia nitrogen into nitrate nitrogen to realize the ammonia nitrogen removal effect, the phosphorus accumulating bacteria excessively absorb phosphate in the wastewater by using an internal carbon source stored in the body, and the phosphate is transferred into the phosphorus accumulating bacteria to realize the phosphorus removal in the wastewater;
5) the effluent of the aerobic tank enters an anoxic tank of an A/O/A biological treatment system, the anoxic tank receives wastewater supplied by the anaerobic tank, the wastewater provides part of carbon source for the anoxic tank, and denitrifying bacteria in the anoxic tank convert nitrate nitrogen into nitrogen gas by using the carbon source and discharge the nitrogen gas to the air under the anoxic condition to realize the denitrification of the wastewater;
6) the effluent of the anoxic tank enters an MBR (membrane bioreactor), and the majority of microorganisms in the water can be intercepted by the microporous filtration action of an MBR membrane, so that the turbidity and suspended matters of the effluent of the MBR can reach the standard;
7) MBR effluent enters an ultraviolet disinfection tank, under the radiation action of ultraviolet rays in the tank, residual microorganisms in the water are killed, the effluent coliform group is ensured to reach the standard, the effluent of the ultraviolet disinfection tank enters a clean water tank for temporary storage, most of clean water is used for flushing toilets and greening in hospitals, and the redundant clean water is discharged after reaching the standard;
8) the residual sludge in the MBR is periodically sent to a sludge concentration tank to realize sludge concentration and reduce the sludge volume, and the supernatant of the sludge concentration tank flows back to the mixing tank for continuous treatment;
9) the sludge concentrated by the sludge concentration tank enters a sludge digestion tank, organic matters in the sludge are converted into methane under the action of anaerobic digestion bacteria, sludge reduction is realized, the digested sludge is harmlessly stabilized under the long-term high-temperature condition of the sludge digestion tank, and the methane generated by the sludge digestion tank can be collected and used as clean fuel for heating residents and heating the digestion tank in winter;
10) after being digested in the sludge digestion tank, the sludge enters a sludge dewatering machine for treatment, and the sludge is dewatered until the water content is below 80 percent and then is transported out for treatment;
11) and (2) enabling the sludge dehydrator press filtrate to enter a nitrogen and phosphorus recovery tank, adding a disodium hydrogen phosphate solution and a magnesium chloride solution into the nitrogen and phosphorus recovery tank, mixing, so that the molar ratio of magnesium, nitrogen and phosphorus in the wastewater after adding the agent is 1:1:0.8-1.2:1:1, converting nitrogen and phosphorus in the water into struvite, recovering the struvite, using the struvite as a high-efficiency slow release fertilizer for landscaping and farmland fertilization, and refluxing the supernatant of the nitrogen and phosphorus recovery tank to a mixing tank for further treatment.
2. The hospital wastewater treatment and resource recovery method according to claim 1, wherein the width of the fine grid is 1-5 mm, so that a large amount of fine particles and suspended matters in wastewater are removed, the subsequent pipeline blockage is avoided, and the normal operation of treatment equipment is ensured.
3. The hospital wastewater treatment and resource recovery method according to claim 1, wherein the reflux ratio of sludge refluxed to the anaerobic tank by the MBR reactor is 30% -100%.
4. The hospital wastewater treatment and resource recovery method according to claim 1, wherein the aerobic tank is filled with polypropylene ring packing in a proportion of 30-70% of the tank volume.
5. The hospital wastewater treatment and resource recovery method according to claim 1, wherein 5% -20% of the wastewater in the anaerobic tank is diverted to the anoxic tank, so that a carbon source can be provided for denitrifying bacteria in the anoxic tank, the effect of converting nitrate nitrogen into nitrogen by the denitrifying bacteria is ensured, and the purpose of denitrifying the wastewater is achieved.
6. The hospital wastewater treatment and resource recovery method according to claim 1, wherein the MBR membrane of the MBR reactor is a microfiltration membrane or an ultrafiltration membrane, and the membrane module is in a plate type or a hollow fiber type.
7. The hospital wastewater treatment and resource recovery method according to claim 1, wherein the ultraviolet wavelength of the ultraviolet disinfection tank is between 240 nm and 280nm, and the ultraviolet radiation time is not less than 10 s.
8. The hospital wastewater treatment and resource recovery method according to claim 1, wherein the concentration time of the sludge concentration tank is less than 6 hours, and the temperature of the sludge digestion tank is 30-60 ℃.
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