CN111115984A - Sewage treatment process and device for infectious disease hospital - Google Patents
Sewage treatment process and device for infectious disease hospital Download PDFInfo
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- CN111115984A CN111115984A CN202010083522.8A CN202010083522A CN111115984A CN 111115984 A CN111115984 A CN 111115984A CN 202010083522 A CN202010083522 A CN 202010083522A CN 111115984 A CN111115984 A CN 111115984A
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- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- C02F2103/003—Wastewater from hospitals, laboratories and the like, heavily contaminated by pathogenic microorganisms
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Abstract
A sewage treatment process and a treatment device thereof for infectious disease hospitals are disclosed, wherein the device consists of a sewage treatment system, an excess sludge treatment system and a waste gas treatment system; the sewage treatment system consists of an ozone pre-disinfection tank, a septic tank, a grid, an adjusting tank and a3The O + MBR tank and the deep disinfection tank are sequentially connected in series; the residual sludge treatment device consists of a sludge storage disinfection tank, a closed centrifugal dehydrator and sludge incineration equipment; the waste gas treatment system consists of an active carbon device and an ultraviolet disinfection device; after the treatment of the invention, the effluent quality standard is superior to the discharge standard GB18466-2016 of medical institution water pollutants in Table 1 and the comprehensive discharge standard of sewage (GB 8978-The treatment standard of the waste gas and the residual hazardous waste sludge is superior to the requirements of the discharge standard GB18466-2016 of the water pollutants of medical institutions in the table 3 and the table 4 and the requirement of the general disinfection rule of epidemic origin, and the infection of environmental personnel caused by the debugging and the operation of the waste water such as the residual sludge, the aerosol, the grid slag and the like can not occur in the period.
Description
Technical Field
The invention belongs to the technical field of water pollution treatment, and particularly relates to a sewage treatment process and a sewage treatment device for an infectious disease hospital.
Background
Recently, cholera and viral epidemics have occurred in some countries of the world, such as: ebola virus, SARS virus, influenza A H1N1, novel coronavirus (2019-nCoV nucleic acid), avian influenza virus, Ebola virus, middle east respiratory syndrome virus, etc., which have wide infection outbreak area and many deaths and are rare from history. The hospital sewage contains some special pollutants, such as medicines, disinfectants, diagnostic agents, detergents, a large amount of pathogenic microorganisms, parasites, viruses and the like, and has stronger pollution power compared with industrial and domestic sewage, for example, the hospital sewage containing the pathogenic microorganisms cannot reach the standard after being treated or discharged, so that the hospital sewage inevitably pollutes the surrounding environment, ground water sources, rivers and lakes, causes cross virus infection, and causes serious harm to the health of people. The difference of sewage discharge of each medical department of a hospital is not fully considered in the conventional sewage treatment technology, and some sewage purification processes still face the problems of incomplete sterilization, residual pollutants and the like.
2019-nCoV nucleic acid (novel coronavirus) positivity was detected in the stools of patients with confirmed pneumonia infected with certain novel coronaviruses, indicating the presence of live viruses in the stools; the true phase of the rapid spread of SARS virus in large gardens is SARS spread caused by virus pollution (virus infection in the processes of feces virus and aerosol) in the sewage system and the environment; ebola virus causing the color change of human smell belongs to the respiratory tract droplet infection; the epidemic prevention experts in 2020 emphasize that the pneumonia transmission paths of the novel coronavirus infection which can be determined at present mainly comprise direct transmission, aerosol transmission and contact transmission, wherein the aerosol transmission means that spray is mixed in the air to form aerosol which causes infection after being inhaled, and the aerosol transmission paths generated in dropping and aerating processes of excrement and sewage are not considered in the traditional medical sewage treatment. The sewage treatment of infectious disease hospitals has the following problems: (1) in the past, the problems of treatment ways such as excrement, grid slag, excess sludge, aerosol virus infection and the like are not considered to be solved, serious infection risks are brought to operators and surrounding environment personnel, the sewage treatment process and device are unreasonable, and the current requirements cannot be met; (2) the prior pretreatment technology (such as chlorine dioxide, sodium hypochlorite and the like) can play a role in seriously inhibiting subsequent biochemical actions, so that the marketing of products of a septic tank or a secondary biological system is easy to cause equipment corrosion, and biochemical sludge and a biological film are difficult to culture and operate. If the treatment is not thorough, the treatment process and the treatment device consider that incomplete or unqualified medical sewage is discharged to the outside, so that public health events are easily caused, and the social influence is very severe. Therefore, there is an urgent need to develop a sewage treatment process and a sewage treatment apparatus for infectious disease hospitals to solve the key problems encountered at present.
Disclosure of Invention
The invention aims to solve the problems and provides a sewage treatment process and a sewage treatment device for an infectious disease hospital to overcome the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a sewage treatment device for an infectious disease hospital consists of a sewage treatment system, an excess sludge treatment system and a waste gas treatment system; it is characterized in that the sewage treatment system consists of an ozone pre-disinfection tank, a septic tank, a grid, an adjusting tank and a3The O + MBR tank and the deep disinfection tank are sequentially connected in series; the residual sludge treatment device consists of a sludge storage disinfection tank, a closed centrifugal dehydrator and sludge incineration equipment; the waste gas treatment system consists of an active carbon device and an ultraviolet disinfection device; a sewage lifting pump is arranged in the regulating tank and connected with the A through a lifting pipeline3The water inlet ends of the O + MBR tanks are communicated; a is described3The O + MBR tank is formed by connecting a pre-anoxic unit, an anaerobic unit, an anoxic unit and an aerobic MBR unit in series, sludge in the aerobic MBR unit flows back to the pre-anoxic unit through a sludge reflux pump and a sludge reflux pipeline, nitrified liquid in the aerobic MBR unit flows back to the anoxic unit through a nitrified liquid reflux pump and a nitrified liquid reflux pipeline, and a residual sludge discharge system is arranged in the aerobic MBR unit; the deep disinfection tank is a baffling type contact disinfection tank, and the body is an ozone disinfection tank or a chlorine dioxide disinfection tank or a sodium hypochlorite disinfection tank; the sewage treatment device adopts a totally enclosed structure and a full-flow deodorization and disinfection structure; the ozone pre-disinfection tank consists of an ozone contact oxidation unit and an ozone reaction unit.
Each treatment device is operated in a closed mode, and the upper end of each tank is provided with an observation port.
The upper parts of the sewage treatment devices are respectively provided with an exhaust pipe which is respectively communicated with an exhaust main pipeline, and the tail end of the exhaust main pipeline is sequentially provided with an active carbon device and an ultraviolet disinfection device.
The grating is a comminuted grating.
The crushing grid is placed at the inlet of the adjusting tank.
And the filtrate of the closed centrifugal dehydrator is discharged into an ozone contact oxidation unit of the ozone pre-disinfection pool.
And the outlet of the residual sludge discharge system is connected with the sludge storage disinfection tank.
The mud storage disinfection tank is provided with a lime or bleaching powder disinfection dosing device.
The ozone pre-disinfection tank is provided with an ozone adding system.
The regulating reservoir can be an integrated lifting pump station.
The MBR membrane is an ultrafiltration membrane.
The sewage treatment process of the sewage treatment device in the infectious disease hospital comprises the following process steps:
(1) an ozone pre-disinfection tank: in the ozone contact oxidation unit, ozone added by an ozone adding system is fully contacted with sewage and excrement in an infectious disease hospital and generates oxidation reduction disinfection reaction; in the ozone reaction unit, residual dissolved ozone and hydroxyl free radicals are utilized to carry out disinfection reaction, and the residual ozone and the hydroxyl free radicals are consumed and removed, so that the inhibition of the residual ozone and the hydroxyl free radicals is prevented, and the microorganism domestication culture of the subsequent secondary biochemical treatment process is influenced; bacteria and viruses in sewage and excrement are killed through a two-stage reaction unit of the ozone pre-disinfection tank, so that the viruses are prevented from being infected through excrement, grid slag and aerosol processes in the sewage treatment process; the ozone is treated in the ozone pre-disinfection tank and then enters the next-stage septic tank for treatment;
(2) a septic tank: the three-stage treatment of septic tank can intercept the particles with higher specific weight and the objects floating on them, and the bacteria, virus, parasite and egg are gradually killed by the stepwise fermentation, oxidation-reduction decomposition, and the excrement is treatedFermenting and decomposing feces to reduce the subsequent A3Processing load by an O + MBR pool; after the septic tank is treated, the septic tank enters a next-stage crushing grid for treatment;
(3) a crushing grid: sundries such as paper towels, cloth pieces, fibrous objects and the like in water are crushed and decomposed through the crushing grating, so that the normal operation of a subsequent treatment system is ensured, the problem of blockage is prevented, the problem of virus-containing grating residues caused by the traditional automatic grating is avoided, and the germ infection in the operation process is avoided; after being treated by the comminuted grille, the waste water enters a next-stage regulating tank;
(4) regulating reservoir, A3O + MBR tank: collecting the effluent of the comminuted grille by the regulating reservoir, and lifting the waste water in the regulating reservoir to A by the lifting pump and the lifting pipeline3The water inlet end of a pre-anoxic unit of the O + MBR tank; the pre-anoxic unit HRT is 0.2-1.0 h, the sludge reflux ratio is 30-100%, nitrate in the reflux sludge is removed, and the phosphorus release efficiency of the anaerobic tank is improved; performing a phosphorus release reaction in an anaerobic unit HRT for 0.5-1.0 h; an anoxic unit HRT 2-5.0 h, wherein the reflux ratio of the nitrifying liquid is 100-250%, and nitrate in the refluxed nitrifying liquid is removed to achieve the purpose of removing total nitrogen; an aerobic MBR unit HRT is used for 3.0-10.0 h, the sludge discharge period of the residual sludge is 2-10 min/2h and the content of DO1.5mg/L is more than that of the residual sludge, aerobic decarbonization, nitrification, synchronous nitrification and denitrification and aerobic phosphorus absorption reaction are carried out, an MBR ultrafiltration membrane is used as a physical barrier for intercepting pathogenic microorganisms and sludge, most of the viruses including microorganisms and viruses attached to a microorganism host are removed, and simultaneously sludge-water separation is realized; discharging the residual sludge to a sludge storage disinfection tank; the effluent of the MBR ultrafiltration membrane enters a deep disinfection tank;
(5) a deep disinfection tank: HRT of the baffled contact disinfection tank is not less than 1.5h, residual pathogenic microorganisms penetrating through an MBR ultrafiltration membrane are deeply killed by using added ozone or chlorine dioxide or sodium hypochlorite, the removal effect of sewage is further improved, and the sewage is discharged after reaching the standard after deep disinfection;
(6) a is described3Cleaning an ultrafiltration membrane of the O + MBR tank by adopting online sodium hypochlorite or potassium monopersulfate for soaking and cleaning;
(7) the treatment devices are operated in a closed manner, so that viruses are prevented from being infected in the aerosol process, and the collected waste gas is subjected to sterilization, disinfection and deodorization treatment through the combined treatment process of the activated carbon device and the ultraviolet disinfection device;
(8) discharging the residual sludge to a sludge storage disinfection tank, and carrying out sludge sterilization and disinfection through lime or bleaching powder to inactivate pathogenic microorganisms; the sterilized sludge enters a closed centrifugal dehydrator for deep dehydration, so that pathogenic bacteria transmission of dangerous waste sludge and aerosol is prevented; the dehydrated filtrate of the closed centrifugal dehydrator enters an ozone contact oxidation unit at the front section of raw water, the dehydrated sludge is hermetically packaged and is incinerated by incineration equipment, and hazardous wastes of pathogenic bacteria sludge are thoroughly eliminated.
After the treatment of the invention, the effluent water quality standard is superior to the first-level standard requirements of the discharge standard GB18466-2016 of medical institution water pollutants and the comprehensive discharge standard GB 8978-1996 of sewage, the treatment standard of the waste gas and the residual hazardous waste sludge is superior to the requirements of the discharge standard GB18466-2016 of medical institution water pollutants and the discharge standard GB18466-2016 of sewage in the table 3 and the discharge standard GB 4, and the treatment standard is superior to the requirements of the general disinfection rule of epidemic focus, and the environmental personnel infection caused by the debugging and operation of the residual sludge, aerosol, grid slag and other sewage can not occur in the period.
The invention will be explained in more detail below with reference to the drawings and examples.
Drawings
FIG. 1 shows the sewage treatment process of infectious disease hospital of the present invention.
FIG. 2 is a schematic view of the sewage treatment process and the treatment device thereof in the infectious disease hospital.
Wherein: infectious disease hospital sewage 0; the device comprises an ozone pre-disinfection tank 1, an ozone contact oxidation unit 1-1, an ozone reaction unit 1-2 and an ozone adding system 1-3; a septic tank 2, a three-stage treatment unit (2-1,2-2, 2-3); a pulverizable grid 3; a regulating tank 4 and a lift pump 4-1; A3O + MBR tank 5, pre-anoxic unit 5-1, anaerobic unit 5-2, anoxic unit 5-3, aerobic MBR unit 5-4, ultrafiltration MBR membrane 5-4-1, sludge reflux pump 5-5-1, sludge reflux pipeline 5-5-2, nitrifying liquid reflux pump 5-6-1, nitrifying liquid reflux pipeline 5-6-2; 6-deep disinfection pool, 6-1 deep disinfection medicine-adding system; discharging the sewage 7 after reaching the standard; a sludge storage disinfection tank 8 and a sludge disinfection and drug adding system 8-1; a closed centrifugal dehydrator 9; a sludge incineration apparatus 10; a filtrate discharge system 11; sludge ash 12; an activated carbon device 13, an ultraviolet disinfection device 14; exhaust gas reaching the standard 15; a surplus sludge discharge system p1, a sludge inlet pipe (p2, p 3); a gas collecting branch pipe m1, a main trunk pipe m 2; water inlet pipe (w1, w2, w3, w4, w5) and water outlet pipe w 6.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
in the embodiment 1, referring to fig. 2, a novel virus is developed in society, a batch of shelter hospitals are required to be established in emergency in each province and city, and a batch of sewage treatment stations are matched, wherein the invention is adopted in the first batch in a certain city in Henan province, and a sewage treatment device of the invention consists of sewage treatment systems (1-6), excess sludge treatment systems (8-11) and waste gas treatment systems (13-14); characterized in that the sewage treatment system (1-6) comprises an ozone pre-disinfection tank 1, a septic tank 2, a grid 3, an adjusting tank 4 and A3The O + MBR tank 5 and the deep disinfection tank 6 are connected in series in sequence; the residual sludge treatment system (8-11) consists of a sludge storage disinfection tank 8, a closed centrifugal dehydrator 9, sludge incineration equipment 10 and a filtrate discharge system 11; the waste gas treatment system (13-14) consists of an active carbon device 13 and an ultraviolet disinfection device 14; a sewage lifting pump 4-1 is arranged in the adjusting tank 4 and passes through lifting pipelines w4 and A3The water inlet ends of the O + MBR tanks 5 are communicated; a is described3The O + MBR tank 5 is composed of a pre-anoxic unit 5-1, an anaerobic unit 5-2, an anoxic unit 5-3 and an aerobic MBR unit 5-4 which are connected in series, sludge in the aerobic MBR unit 5-4 flows back to the pre-anoxic unit 5-1 through a sludge return pump 5-5-1 and a sludge return pipeline 5-5-2, nitrified liquid in the aerobic MBR unit 5-4 flows back to the anoxic unit 5-3 through a nitrified liquid return pump 5-6-1 and a nitrified liquid return pipeline 5-6-2, and a residual sludge discharge system p1 is arranged in the aerobic MBR unit 5-4; the deep disinfection tank 8 is a baffled contact disinfection tank, and the body is a chlorine dioxide disinfection tank; the sewage treatment devices (1-15) are all of a fully-closed structure and a full-flow deodorization and disinfection structure; the ozone pre-disinfection tank 1 consists of an ozone contact oxidation unit 1-1 and an ozone reaction unit 1-2.
Each treatment device (1-15) is operated in a closed mode, and an observation port is arranged at the upper end of each pool.
The upper parts of the sewage treatment devices (1-6) are respectively provided with an exhaust pipe m1 and are respectively communicated with an exhaust main pipe m2, and the tail end of the exhaust main pipe m2 is sequentially provided with an active carbon device 13 and an ultraviolet disinfection device 14.
The grid 3 is a shatter grid.
The shatter grid 3 is placed at the inlet of the adjusting tank 4.
And the filtrate 11 of the closed centrifugal dehydrator 9 is discharged into a water inlet section of an ozone contact oxidation unit 1-1 of the ozone pre-disinfection tank 1.
The outlet of the residual sludge discharge system p1 is connected with the sludge storage disinfection tank 8.
The sludge storage disinfection tank 8 is provided with a lime disinfection dosing system 8-1.
The ozone pre-disinfection tank 1 is provided with an ozone adding system 1-1.
The adjusting tank 4 can be an integrated lifting pump station.
The MBR membrane 5-4-1 is an ultrafiltration membrane.
The sewage treatment process of the sewage treatment device in the infectious disease hospital comprises the following process steps:
(1) ozone pre-disinfection tank 1: in the ozone contact oxidation unit 1-1, ozone added by the ozone adding system 1-3 is fully contacted with sewage and excrement 0 of an infectious disease hospital and oxidation reduction disinfection reaction is carried out; in the ozone reaction unit 1-2, residual dissolved ozone and hydroxyl radicals are utilized to carry out disinfection reaction, and the residual ozone and hydroxyl radicals are consumed and removed, so that the inhibition of the residual ozone and hydroxyl radicals is prevented, and the microorganism domestication culture of the subsequent secondary biochemical treatment process is influenced; bacteria and viruses in the sewage and the excrement are killed through two-stage reaction units (1-1, 1-2) of the ozone pre-disinfection tank 1, so that the viruses in the original sewage are prevented from being infected through excrement, grid slag and aerosol processes; the ozone is treated in the ozone pre-disinfection tank and then enters the next-stage septic tank for treatment;
(2) a septic tank 2: the particles with larger specific gravity and lighter objects floating on the particles are intercepted by three-stage treatment (2-1,2-2,2-3) of the septic tank 2Gradually killing bacteria, viruses, parasites and eggs through gradual fermentation and redox decomposition, and fermenting and decomposing feces to reduce A3The O + MBR tank 5 processes the load; the septic tank 2 enters a next-stage crushing grid 3 for treatment after treatment;
(3) crushing grid 3: sundries such as paper towels, cloth pieces, fibrous objects and the like in the water are crushed and decomposed by the crushing grating 3, so that the normal operation of a subsequent treatment system is ensured, the blockage problem is prevented, the infection problem caused by virus-containing grating residues in the traditional automatic grating is avoided, and the germ infection in the operation process is avoided; the crushed grating 3 enters a next-stage regulating tank 4 after being treated;
(4) regulating reservoir 4, A3O + MBR tank 5: the adjusting tank 4 collects the effluent of the comminuted grille 3, and the wastewater in the adjusting tank 4 is lifted to A through a lifting pump 4-1 and a lifting pipeline w43The water inlet end of a pre-anoxic unit 5-1 of the O + MBR tank 5; HRT of the pre-anoxic unit 5-1 is 0.2-1.0 h, the sludge reflux ratio is 30-100%, nitrate in the reflux sludge is removed, and the phosphorus release efficiency of the anaerobic tank is improved; HRT of the anaerobic unit 5-2 is 0.5-1.0 h, and phosphorus release reaction is carried out; HRT 2-5.0 h of the anoxic unit 5-3, the reflux ratio of the nitrifying liquid is 100-250%, nitrate in the refluxed nitrifying liquid is removed, and the purpose of removing total nitrogen is achieved; HRT of an aerobic MBR unit 5-4 is 3.0-10.0 h, the sludge discharge period of the residual sludge is 2-10 min/2h and more than DO1.5mg/L, aerobic decarbonization, nitrification, synchronous nitrification and denitrification and aerobic phosphorus absorption reaction are carried out, an MBR ultrafiltration membrane 5-4-1 is used as a physical barrier for intercepting pathogenic microorganisms and sludge, most of microorganisms and viruses attached to a microorganism host are removed, and sludge-water separation is realized at the same time; discharging the excess sludge to a sludge storage disinfection tank 8 through an excess sludge discharge system p 1; the effluent of the MBR ultrafiltration membrane 5-4-1 enters a deep disinfection tank 6;
(5) and (3) deep disinfection tank 6: HRT of the baffled contact disinfection tank 6 is not less than 1.5h, residual pathogenic microorganisms penetrating through an MBR ultrafiltration membrane 5-4-1 are deeply killed by using a chlorine dioxide medicament added by a deep disinfection medicament adding system 6-1, the removal effect of sewage is further improved, and the sewage is discharged after reaching the standard after deep disinfection;
(6) a is described3Cleaning an ultrafiltration membrane 5-4-1 of the O + MBR tank 5 by adopting an online sodium hypochlorite dosing system 5-4-1-1 for soaking and cleaning;
(7) the treatment devices (1-16) are operated in a closed manner, so that viruses are prevented from being infected in an aerosol process generated in processes such as excrement, sludge, grid slag, aeration process or water drop and the like, and the collected waste gas is subjected to sterilization, disinfection and deodorization treatment through a combined treatment process of the activated carbon device 14 and the ultraviolet disinfection device 14;
(8) the excess sludge is discharged to a sludge storage disinfection tank 8 through an excess sludge discharge system p1, and matched medicaments are added through a lime adding system 8-1 to sterilize and disinfect the sludge, so that pathogenic microorganisms are inactivated; the sterilized sludge enters a closed centrifugal dehydrator 9 for deep dehydration, so that pathogenic bacteria transmission of dangerous waste sludge and aerosol is prevented; the dehydrated filtrate of the closed centrifugal dehydrator 9 enters an ozone contact oxidation unit 1-1 at the front section of raw water, the dehydrated sludge is hermetically packaged and is incinerated by an incinerator 10, and pathogenic bacteria in the sludge are thoroughly eliminated.
Example 2
Sewage treatment project of 2019-nCoV nucleic acid (novel coronavirus) infectious disease hospital for newly-built infectious disease in Wuhan city, Hubei province, and sewage treatment scale is 1000m3The same treatment process and treatment apparatus as in example 1 were used, except that: the deep disinfection tank 8 is a sodium hypochlorite disinfection tank, and the disinfectant adding system 6-1 adopts sodium hypochlorite to carry out deep disinfection; the sludge storage disinfection tank 8 is a bleaching powder disinfection and dosing system 8-1, and the ultrafiltration membrane 5-4-1 of the A3O + MBR tank 5 is cleaned by adopting an online potassium monopersulfate dosing system 5-4-1-1 for soaking and cleaning; the treated effluent water quality standard is superior to the first-level standard requirements of the discharge standard GB18466-2016 of the medical institution water pollutants and the comprehensive discharge standard GB 8978-1996 of the sewage, the treatment standard of the waste gas and the residual hazardous waste sludge is superior to the requirements of the discharge standard GB18466-2016 of the medical institution water pollutants and the treatment standard GB18466-2016 of the sewage, the table 3 and the table 4, no environmental personnel infection cases caused by the debugging and the operation of the sewage such as the residual sludge, the aerosol, the grid slag and the like occur in the period, and 2019-nCoV nucleic acid is not detected in the final effluent, the sludge, the waste gas and the air (novel crown)Lepidovirus) is superior to the requirement of general Disinfection rules of epidemic origin.
Example 3
The sewage treatment scale of a certain infectious disease hospital in Beijing is 2000m3The difference between the treatment process and the treatment apparatus used in example 1 is: the difference lies in that: the body of the deep disinfection tank 8 is an ozone disinfection tank; the disinfectant is added with an ozone medicament added by a disinfectant adding system 6-1; after treatment, the effluent quality standard is superior to the first-level standard requirements of the discharge standard GB18466-2016 of the medical institution water pollutants and the comprehensive discharge standard GB 8978-1996 of the sewage, the treatment standard of the waste gas and the residual hazardous waste sludge is superior to the requirements of the discharge standard GB18466-2016 of the medical institution water pollutants and the table 3 and the table 4, and the treatment standard is superior to the requirements of the general disinfection rules of epidemic sources and places, and no case of environmental personnel infection caused by the debugging and operation of the residual sludge, aerosol, grid slag and other sewage occurs in the period.
Example 4
Sewage treatment project of Guangzhou tuberculosis hospital, sewage treatment scale 800m3The difference between the treatment process and the treatment apparatus used in example 1 is: the body of the deep disinfection tank 8 is an ozone disinfection tank; an ozone medicament is added into a disinfectant adding system 6-1, and an ultrafiltration membrane 5-4-1 of the A3O + MBR tank 5 is cleaned by adopting an online potassium monopersulfate dosing system 5-4-1-1 for soaking and cleaning; adding a matched medicament through a bleaching powder adding system 8-1 to sterilize the sludge; after treatment, the effluent quality standard is superior to the first-level standard requirements of the discharge standard GB18466-2016 of the medical institution water pollutants and the comprehensive discharge standard GB 8978-1996 of the sewage, the treatment standard of the waste gas and the residual hazardous waste sludge is superior to the requirements of the discharge standard GB18466-2016 of the medical institution water pollutants and the table 3 and the table 4, and the treatment standard is superior to the requirements of the general disinfection rules of epidemic sources and places, and no case of environmental personnel infection caused by the debugging and operation of the residual sludge, aerosol, grid slag and other sewage occurs in the period.
Example 5
The sewage treatment scale of a sewage treatment project of a certain people hospital in Jiangsu province is 3000m3D, the treatment process and the treatment apparatus are the same as those described above, and are differentCharacterized in that: the difference from example 1 is that: cleaning an ultrafiltration membrane 5-4-1 of the A3O + MBR tank 5 by adopting an online sodium hypochlorite or potassium monopersulfate dosing system 5-4-1-1 for soaking and cleaning; after treatment, the effluent quality standard is superior to the first-level standard requirements of the discharge standard GB18466-2016 of the medical institution water pollutants and the comprehensive discharge standard GB 8978-1996 of the sewage, the treatment standard of the waste gas and the residual hazardous waste sludge is superior to the requirements of the discharge standard GB18466-2016 of the medical institution water pollutants and the table 3 and the table 4, and the treatment standard is superior to the requirements of the general disinfection rules of epidemic sources and places, and no case of environmental personnel infection caused by the debugging and operation of the residual sludge, aerosol, grid slag and other sewage occurs in the period.
The above-mentioned examples are only intended to illustrate the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, wherein the ozone pre-sterilization tank can be replaced by the uv pre-sterilization tank without departing from the spirit of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art shall fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. A sewage treatment device for an infectious disease hospital consists of a sewage treatment system, an excess sludge treatment system and a waste gas treatment system; the method is characterized in that: the sewage treatment system is formed by sequentially connecting an ozone pre-disinfection tank, a septic tank, a grid, an adjusting tank, an A3O + MBR tank and a deep disinfection tank in series;
the residual sludge treatment device consists of a sludge storage disinfection tank, a closed centrifugal dehydrator and sludge incineration equipment; the waste gas treatment system consists of an active carbon device and an ultraviolet disinfection device;
a sewage lifting pump is arranged in the regulating tank and is communicated with the water inlet end of the A3O + MBR tank through a lifting pipeline;
the A3O + MBR tank is formed by connecting a pre-anoxic unit, an anaerobic unit, an anoxic unit and an aerobic MBR unit in series, sludge in the aerobic MBR unit is refluxed to the pre-anoxic unit through a sludge reflux pump and a sludge reflux pipeline, nitrified liquid in the aerobic MBR unit is refluxed to the anoxic unit through a nitrified liquid reflux pump and a nitrified liquid reflux pipeline, and a residual sludge discharge system is arranged in the aerobic MBR unit;
the deep disinfection tank is a baffling type contact disinfection tank, and the body is an ozone disinfection tank or a chlorine dioxide disinfection tank or a sodium hypochlorite disinfection tank; the sewage treatment device adopts a totally enclosed structure and a full-flow deodorization and disinfection structure;
the ozone pre-disinfection tank consists of an ozone contact oxidation unit and an ozone reaction unit.
2. The sewage treatment device of the infectious disease hospital according to claim 1, characterized in that: each treatment device is operated in a closed mode, and the upper end of each tank is provided with an observation port.
3. The sewage treatment device of the infectious disease hospital according to claim 1, characterized in that: the upper parts of the sewage treatment devices are respectively provided with an exhaust pipe which is respectively communicated with an exhaust main pipeline, and the tail end of the exhaust main pipeline is sequentially provided with an active carbon device and an ultraviolet disinfection device.
4. The sewage treatment device of the infectious disease hospital according to claim 1, characterized in that: the grating is a comminuted grating.
5. The sewage treatment device of the infectious disease hospital according to claim 1, characterized in that: the crushing grid is placed at the inlet of the adjusting tank.
6. The sewage treatment device of the infectious disease hospital according to claim 1, characterized in that: and the filtrate of the closed centrifugal dehydrator is discharged into an ozone contact oxidation unit of the ozone pre-disinfection pool.
7. The sewage treatment device of the infectious disease hospital according to claim 1, characterized in that: and the outlet of the residual sludge discharge system is connected with the sludge storage disinfection tank.
8. The sewage treatment device of the infectious disease hospital according to claim 1, characterized in that: the mud storage disinfection tank is provided with a lime or bleaching powder disinfection dosing device.
9. The sewage treatment device of the infectious disease hospital according to claim 1, characterized in that: the ozone pre-disinfection tank is provided with an ozone adding system, the adjusting tank can be an integrated lifting pump station, and the MBR membrane is an ultrafiltration membrane.
10. A sewage treatment process of a sewage treatment device of an infectious disease hospital is characterized in that: the process comprises the following steps:
(1) an ozone pre-disinfection tank: in the ozone contact oxidation unit, ozone added by an ozone adding system is fully contacted with sewage and excrement in an infectious disease hospital and generates oxidation reduction disinfection reaction; in the ozone reaction unit, residual dissolved ozone and hydroxyl free radicals are utilized to carry out disinfection reaction, and the residual ozone and the hydroxyl free radicals are consumed and removed, so that the inhibition of the residual ozone and the hydroxyl free radicals is prevented, and the microorganism domestication culture of the subsequent secondary biochemical treatment process is influenced; bacteria and viruses in sewage and excrement are killed through a two-stage reaction unit of the ozone pre-disinfection tank, so that the viruses are prevented from being infected through excrement, grid slag and aerosol processes in the sewage treatment process; the ozone is treated in the ozone pre-disinfection tank and then enters the next-stage septic tank for treatment;
(2) a septic tank: the manure is treated in three stages by a septic tank, particles with larger specific gravity and objects which float on the manure lighter are intercepted, bacteria, viruses, parasites, eggs and the like die gradually by fermentation and redox decomposition step by step, and the manure is fermented and decomposed to reduce the treatment load of a subsequent A3O + MBR tank; after the septic tank is treated, the septic tank enters a next-stage crushing grid for treatment;
(3) a crushing grid: sundries such as paper towels, cloth pieces, fibrous objects and the like in water are crushed and decomposed through the crushing grating, so that the normal operation of a subsequent treatment system is ensured, the problem of blockage is prevented, the problem of virus-containing grating residues caused by the traditional automatic grating is avoided, and the germ infection in the operation process is avoided; after being treated by the comminuted grille, the waste water enters a next-stage regulating tank;
(4) equalizing basin, A3O + MBR pond: collecting the effluent of the comminuted grille by the regulating reservoir, and lifting the wastewater in the regulating reservoir to the water inlet end of the pre-anoxic unit of the A3O + MBR tank by a lifting pump and a lifting pipeline; the pre-anoxic unit HRT is 0.2-1.0 h, the sludge reflux ratio is 30-100%, nitrate in the reflux sludge is removed, and the phosphorus release efficiency of the anaerobic tank is improved; performing a phosphorus release reaction in an anaerobic unit HRT for 0.5-1.0 h; an anoxic unit HRT 2-5.0 h, wherein the reflux ratio of the nitrifying liquid is 100-250%, and nitrate in the refluxed nitrifying liquid is removed to achieve the purpose of removing total nitrogen; an aerobic MBR unit HRT is used for 3.0-10.0 h, the sludge discharge period of the residual sludge is 2-10 min/2h and the content of DO1.5mg/L is more than that of the residual sludge, aerobic decarbonization, nitrification, synchronous nitrification and denitrification and aerobic phosphorus absorption reaction are carried out, an MBR ultrafiltration membrane is used as a physical barrier for intercepting pathogenic microorganisms and sludge, most of the viruses including microorganisms and viruses attached to a microorganism host are removed, and simultaneously sludge-water separation is realized; discharging the residual sludge to a sludge storage disinfection tank; the effluent of the MBR ultrafiltration membrane enters a deep disinfection tank;
(5) a deep disinfection tank: HRT of the baffled contact disinfection tank is not less than 1.5h, residual pathogenic microorganisms penetrating through an MBR ultrafiltration membrane are deeply killed by using added ozone or chlorine dioxide or sodium hypochlorite, the removal effect of sewage is further improved, and the sewage is discharged after reaching the standard after deep disinfection;
(6) the ultrafiltration membrane of the A3O + MBR tank is cleaned by soaking and cleaning with online sodium hypochlorite or potassium monopersulfate;
(7) the treatment devices are operated in a closed manner, so that viruses are prevented from being infected in the aerosol process, and the collected waste gas is subjected to sterilization, disinfection and deodorization treatment through the combined treatment process of the activated carbon device and the ultraviolet disinfection device;
(8) discharging the residual sludge to a sludge storage disinfection tank, and carrying out sludge sterilization and disinfection through lime or bleaching powder to inactivate pathogenic microorganisms; the sterilized sludge enters a closed centrifugal dehydrator for deep dehydration, so that pathogenic bacteria transmission of dangerous waste sludge and aerosol is prevented; the dehydrated filtrate of the closed centrifugal dehydrator enters an ozone contact oxidation unit at the front section of raw water, the dehydrated sludge is hermetically packaged and is incinerated by incineration equipment, and hazardous wastes of pathogenic bacteria sludge are thoroughly eliminated.
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| CN111943364A (en) * | 2020-08-03 | 2020-11-17 | 昆明金泽实业有限公司 | Method for eliminating influence of disinfectant on biochemical system by using excess sludge |
| CN112321091A (en) * | 2020-11-06 | 2021-02-05 | 成都柏森环保科技有限公司 | Synchronous vacuum collecting, disinfecting and drug degradation standard-reaching treatment system for medical sewage |
| CN113480120A (en) * | 2021-07-26 | 2021-10-08 | 沈阳环境科学研究院 | Vehicle-mounted disinfection and deep dehydration integrated device and operation method thereof |
| CN113480121A (en) * | 2021-07-26 | 2021-10-08 | 沈阳环境科学研究院 | Vehicle-mounted medical institution sludge treatment device and operation method thereof |
| CN114988645A (en) * | 2022-06-17 | 2022-09-02 | 国晟生态环境科技有限公司 | Novel medical sewage treatment method and application thereof |
| CN115259558A (en) * | 2022-07-29 | 2022-11-01 | 中国人民解放军陆军工程大学 | Underground cooperative collection and treatment system for medical wastewater and garbage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111943364A (en) * | 2020-08-03 | 2020-11-17 | 昆明金泽实业有限公司 | Method for eliminating influence of disinfectant on biochemical system by using excess sludge |
| CN112321091A (en) * | 2020-11-06 | 2021-02-05 | 成都柏森环保科技有限公司 | Synchronous vacuum collecting, disinfecting and drug degradation standard-reaching treatment system for medical sewage |
| CN113480120A (en) * | 2021-07-26 | 2021-10-08 | 沈阳环境科学研究院 | Vehicle-mounted disinfection and deep dehydration integrated device and operation method thereof |
| CN113480121A (en) * | 2021-07-26 | 2021-10-08 | 沈阳环境科学研究院 | Vehicle-mounted medical institution sludge treatment device and operation method thereof |
| CN114988645A (en) * | 2022-06-17 | 2022-09-02 | 国晟生态环境科技有限公司 | Novel medical sewage treatment method and application thereof |
| CN114988645B (en) * | 2022-06-17 | 2023-10-10 | 国晟生态环境科技有限公司 | Medical sewage treatment method and application thereof |
| CN115259558A (en) * | 2022-07-29 | 2022-11-01 | 中国人民解放军陆军工程大学 | Underground cooperative collection and treatment system for medical wastewater and garbage |
| CN115259558B (en) * | 2022-07-29 | 2023-08-11 | 中国人民解放军陆军工程大学 | Medical wastewater and garbage underground cooperative collection treatment system |
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