CN111908705A

CN111908705A - Nitrogen and phosphorus removal process based on multi-effect medical sewage treatment

Info

Publication number: CN111908705A
Application number: CN202010559757.XA
Authority: CN
Inventors: 黄全辉
Original assignee: Beijing Lvdu Haotian Environmental Protection Technology Co ltd
Current assignee: Beijing Lvdu Haotian Environmental Protection Technology Co ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2020-11-10
Anticipated expiration: 2040-06-18
Also published as: CN111908705B

Abstract

The invention relates to a denitrification and dephosphorization process based on multi-effect medical sewage treatment, which comprises the following steps: the device comprises a mechanical grid 1, a regulating tank 2, a first air blower 3, a first pump 4, an anoxic tank 5, a contact oxidation tank 6, a second pump 7, a second air blower 8, a vertical flow sedimentation tank 9, a third pump 10, a coagulation reaction tank 11, a PFS tank 12, a PAM tank 13, an inclined tube sedimentation tank 14, a fourth pump 15, a contact disinfection tank 16, a sodium hypochlorite tank 17, a sludge tank 18, a grid slag collecting bag 19 and a central processing unit. According to the invention, the central processing unit is added in the system, and the control of the system on the sludge can be effectively improved by detecting the water level in the designated water pool and selecting the corresponding operating parameters of the blower and the corresponding dosing amount of the dosing tank according to the detection result.

Description

Nitrogen and phosphorus removal process based on multi-effect medical sewage treatment

Technical Field

The invention relates to the technical field of medical sewage treatment, in particular to a nitrogen and phosphorus removal process based on multi-effect medical sewage treatment.

Background

In recent years, the national requirements for sewage environmental protection discharge are more and more strict, and with the increase of the environmental protection law enforcement, the final discharge of medical sewage is required to reach the discharge standard of water pollutants of medical institutions (GB18466-2005) and the water quality standard of sewage discharged into urban sewers (CJ343-2010), and the standard requirements of total nitrogen and total phosphorus of discharged water are increased. The total phosphorus of the medical sewage is about 4-15 mg/L, the effluent requirement reaches below 8mg/L, the requirement for phosphorus is deducted from the microorganism synthesis in the biochemical treatment section, and finally the total phosphorus of the effluent is close to the discharge requirement. But the prior medical sewage treatment system rarely considers the standard reaching problem of the two indexes at the same time. Meanwhile, on the traditional medical sewage treatment system, biological contact oxidation and precipitation (first-stage) are carried out, and air bubbles are wrapped by a biological film falling off from a biological contact oxidation section, so that the sedimentation is difficult, and finally, the suspended matters in the effluent are unstable and sometimes exceed the standard. Especially, the inclined tube sedimentation tank is connected after biological contact oxidation, and because the sewage entering the sedimentation section still has higher dissolved oxygen, microorganisms are bred on the inclined tube filler after the operation for a period of time, so that the sedimentation effect is influenced.

For traditional sewage treatment system, prior art exists that the effluent suspended solid is unstable, not up to standard and can't carry out the technical problem that high-efficient control leads to mud.

Disclosure of Invention

Therefore, the invention provides a denitrification and dephosphorization process based on multi-effect medical sewage treatment, which is used for overcoming the technical problems that effluent suspended matters are unstable and do not reach the standard and sludge cannot be efficiently controlled in the prior art.

In order to solve the problems, the invention provides a denitrification and dephosphorization process based on multi-effect medical sewage treatment, which comprises the following steps:

the mechanical grating is arranged at the sewage inlet channel of the pump station and is used for preliminarily intercepting sewage and removing floating objects in the sewage;

the adjusting tank is connected with the mechanical grating and is used for adjusting the water quantity or the water quality of the sewage in the adjusting tank;

the first air blower is connected with the regulating tank and used for conveying air to the regulating tank to stir the sewage;

the first pump is connected with the regulating tank and is used for conveying the wastewater in the regulating tank to the anoxic tank;

the anoxic tank is connected with the first pump, and denitrifying bacteria are arranged in the anoxic tank and used for anoxic treatment in the anoxic tank;

the contact oxidation tank is connected with the anoxic tank, and a blower is arranged at the bottom of the contact oxidation tank and used for providing oxygen source for the contact oxidation tank so that nitrifying bacteria in the contact oxidation tank can adsorb and degrade organic matters in sewage in the contact oxidation tank;

the second pump is respectively connected with the contact oxidation tank and the anoxic tank and is used for returning sewage in the contact oxidation tank to the anoxic tank;

the second air blower is respectively connected with the anoxic tank and the contact oxidation tank and is used for respectively delivering air to the contact oxidation tank and the anoxic tank so as to respectively stir the sewage in the contact oxidation tank and the anoxic tank;

the vertical flow sedimentation tank is connected with the contact oxidation tank and is used for carrying out sludge-water separation on the sewage in the vertical flow sedimentation tank;

a third pump, one end of a pipeline of which is connected with the vertical flow sedimentation tank, and the other end of the pipeline is respectively connected with the sludge tank and the anoxic tank, and is used for respectively conveying the sludge in the vertical flow sedimentation tank into the sludge tank and the anoxic tank;

the coagulation reaction tank is connected with the vertical flow sedimentation tank and is used for coagulating colloid and fine suspended matters in the sewage in the coagulation reaction tank into floccules;

the inclined tube sedimentation tank is connected with the coagulation reaction tank and is used for settling flocculates in the coagulation reaction tank;

one end of the fourth pump is connected with the outlet of the inclined tube sedimentation tank, and the other end of the fourth pump is connected with the inlet of the sludge tank, so that flocculates in the inclined tube sedimentation tank are conveyed to the sludge tank;

the contact disinfection tank is connected with the inclined tube sedimentation tank and is used for disinfecting and bleaching sewage in the contact disinfection tank;

the sludge tank is respectively connected with the third pump and the fourth pump and is used for storing sludge output by the third pump and the fourth pump;

a grid slag collecting bag connected with the mechanical grid and used for storing floaters obtained after the sewage is intercepted and removed by the mechanical grid

The central processing unit is respectively connected with the air blowers, the dosing tanks in the coagulation reaction tank and the contact disinfection tank and is used for controlling the operation parameters of the air blowers and the dosing amount of the dosing tanks according to the water level in the corresponding water tank so as to ensure that the system can efficiently remove nitrogen and phosphorus from the sewage;

and water level meters are arranged in the regulating tank, the anoxic tank, the contact oxidation tank, the coagulation reaction tank and the contact disinfection tank and are used for respectively detecting the water level in each water tank.

Further, a first preset water level matrix group Ha (Ht0, Hq0, Hj0) is arranged in the central processing unit, wherein Ht0 is a regulating pond preset water level matrix, Hq0 is an anoxic pond preset water level matrix, and Hj0 is a contact oxidation pond preset water level matrix; for the adjusting tank preset water level matrixes Ht0, Ht0(Ht1, Ht2, Ht3, Ht4), wherein Ht1 is a first adjusting tank preset water level, Ht2 is a second adjusting tank preset water level, Ht3 is a third adjusting tank preset water level, and Ht4 is a fourth adjusting tank preset water level; for the anoxic pond, a preset water level matrix Hq0, Hq0(Hq1, Hq2, Hq3, Hq4) is provided, wherein Hq1 is a first preset water level of the anoxic pond, Hq2 is a second preset water level of the anoxic pond, Hq3 is a third preset water level of the anoxic pond, and Hq4 is a fourth preset water level of the anoxic pond; for a contact oxidation pond preset water level matrix Hj0, Hj0(Hj1, Hj2, Hj3 and Hj4), wherein Hj1 is a first preset water level of the contact oxidation pond, Hj2 is a second preset water level of the contact oxidation pond, Hj3 is a third preset water level of the contact oxidation pond, and Hj4 is a fourth preset water level of the contact oxidation pond;

the central processor is also provided with a first air blower preset operation matrix group Fa and a second air blower preset operation matrix group Fb; presetting operation matrix groups Fa and Fa (Fa1, Fa2, Fa3 and Fa4) for the first blower, wherein Fa1 is a first preset operation matrix of the first blower, Fa2 is a second preset operation matrix of the first blower, Fa3 is a third preset operation matrix of the first blower, and Fa4 is a fourth preset operation matrix of the first blower; for the preset operation matrix Fai for the ith blower, i is 1, 2, 3, 4, Fai (Pai, Tai), where Pai is the ith preset power of the first blower and Tai is the ith preset duration of the first blower; for a second blower preset operation matrix group, Fb (Fb1, Fb2, Fb3, Fb4), wherein Fb1 is a second blower first preset operation matrix, Fb2 is a second blower second preset operation matrix, Fb3 is a second blower third preset operation matrix, and Fb4 is a second blower fourth preset operation matrix; for the preset operation matrix Fai, Fai (Pai, Tai) for the ith of the second blower, where Pai is the ith preset power of the second blower and Tai is the ith preset duration of the second blower;

when first air-blower is right during the equalizing basin delivered air, the water level gauge in the equalizing basin can detect equalizing basin water level Ht, detects the completion back, and central processing unit can Ht and each item parameter in the Ht0 matrix contrast:

when Ht is less than or equal to Ht1, the central processing unit adjusts the operation power of the first blower to Pa1 and adjusts the operation time of the first blower to Ta 1;

when Ht is more than Ht1 and less than or equal to Ht2, the central processing unit adjusts the operation power of the first blower to Pa2 and adjusts the operation time of the first blower to Ta 2;

when Ht is more than Ht2 and less than or equal to Ht3, the central processing unit adjusts the operation power of the first blower to Pa3 and adjusts the operation time of the first blower to Ta 3;

when Ht is more than Ht3 and less than or equal to Ht4, the central processing unit adjusts the operation power of the first blower to Pa4 and adjusts the operation time of the first blower to Ta 4;

when the second air-blower is right when the oxygen deficiency pond transported air, the water level gauge in the oxygen deficiency pond can detect oxygen deficiency pond water level Hq, and after the detection was accomplished, central processing unit can Hq compare with each item parameter in the Hq0 matrix:

when Hq is less than or equal to Hq1, the central processing unit adjusts the operation power of the second blower to Pb1 and adjusts the operation time of the second blower to Tb 1;

when Hq1 is more than Hq and is less than or equal to Hq2, the central processing unit adjusts the operation power of the second blower to Pb2 and adjusts the operation time of the second blower to Tb 2;

when Hq2 is more than Hq and is less than or equal to Hq3, the central processing unit adjusts the operation power of the second blower to Pb3 and adjusts the operation time of the second blower to Tb 3;

when Hq3 is more than Hq and is less than or equal to Hq4, the central processing unit adjusts the operation power of the second blower to Pb4 and adjusts the operation time of the second blower to Tb 4;

when the second air blower conveys air to the contact oxidation pond, a water level gauge in the contact oxidation pond can detect the water level Hj of the contact oxidation pond, and after the detection is finished, a central processing unit can compare the Hj with various parameters in a Hj0 matrix:

when the Hj is less than or equal to Hj1, the central processing unit adjusts the operation power of the second blower to Pb1 and adjusts the operation time of the second blower to Tb 1;

when the Hj1 is more than the Hj and less than or equal to Hj2, the central processing unit adjusts the operation power of the second blower to Pb2 and adjusts the operation time of the second blower to Tb 2;

when the Hj2 is more than the Hj and less than or equal to Hj3, the central processing unit adjusts the operation power of the second blower to Pb3 and adjusts the operation time of the second blower to Tb 3;

when Hj3 is more than Hj and less than or equal to Hj4, the central processing unit adjusts the operation power of the second blower to Pb4 and adjusts the operation time of the second blower to Tb 4.

Further, the coagulation reaction tank includes:

the PFS tank is connected with the coagulation reaction tank, and PFS is filled in the PFS tank and used for flocculating and adsorbing solutes of the sewage in the coagulation reaction tank;

PAM jar, it with the coagulation reaction pond links to each other, and PAM jar is inside to be equipped with PAM for flocculation and the solute of absorption coagulation reaction pond internal waste water.

Further, be equipped with the sodium hypochlorite jar in the contact disinfection pond, sodium hypochlorite jar inside is equipped with sodium hypochlorite for bleach and disinfect sewage.

Further, a second preset water level matrix group Hb (Hh0, Hc0) is further arranged in the central processing unit, wherein Hh0 is a preset water level matrix of the coagulation reaction tank, and Hc0 is a preset water level matrix of the contact disinfection tank; for the coagulation reaction tank, a preset water level matrix Hh0, Hh0(Hh1, Hh2, Hh3 and Hh4) is provided, wherein Hh1 is a first preset water level of the coagulation reaction tank, Hh2 is a second preset water level of the coagulation reaction tank, Hh3 is a third preset water level of the coagulation reaction tank, and Hh4 is a fourth preset water level of the coagulation reaction tank; for the contact disinfection tank preset water level matrix Hc0, Hc0(Hc1, Hc2, Hc3, Hc4), wherein Hc1 is the first preset water level of the contact disinfection tank, Hc2 is the second preset water level of the contact disinfection tank, Hc3 is the third preset water level of the contact disinfection tank, and Hc4 is the fourth preset water level of the contact disinfection tank;

the central processing unit is also provided with a preset dosing amount matrix group G0(Ga, Gb and Gc), wherein Ga is a preset dosing matrix of the PFS tank, Gb is a preset dosing matrix of the PAM tank, Gc is a preset dosing matrix of the sodium hypochlorite tank, the dosing matrix Ga and Ga (Ga1, Ga2, Ga3 and Ga4) are preset for the PFS tank, Ga1 is a first preset dosing amount of the PFS tank, Ga2 is a second preset dosing amount of the PFS tank, Ga3 is a third preset dosing amount of the PFS tank, and Ga4 is a fourth preset dosing amount of the PFS tank; a Gb and Gb (Gb1, Gb2, Gb3 and Gb4) are preset for a PAM tank, wherein the Gb1 is a first preset medicine adding amount of the PAM tank, the Gb2 is a second preset medicine adding amount of the PAM tank, the Gb3 is a third preset medicine adding amount of the PAM tank, and the Gb4 is a fourth preset medicine adding amount of the PAM tank; presetting a dosing matrix Gc (Gc1, Gc2, Gc3 and Gc4) for a sodium hypochlorite tank, wherein Gc1 is a first preset dosing amount of the sodium hypochlorite tank, Gc2 is a second preset dosing amount of the sodium hypochlorite tank, Gc3 is a third preset dosing amount of the sodium hypochlorite tank, and Gc4 is a fourth preset dosing amount of the sodium hypochlorite tank;

when the PFS jar to add PFS in the coagulation reaction pond, when PAM jar adds PAM in to the coagulation reaction pond, water level gauge in the coagulation reaction pond can detect pond water level Hh, detects the back of accomplishing, and central processing unit can compare Hh and each parameter in the Hh0 matrix:

when the Hh is less than or equal to Hh1, the central processing unit adjusts the dosing amount of the PFS tank to Ga1 and the dosing amount of the PAM tank to Gb 1;

when the Hh is more than Hh1 and less than or equal to Hh2, the central processor adjusts the dosing amount of the PFS tank to Ga2 and adjusts the dosing amount of the PAM tank to Gb 2;

when the Hh is more than Hh2 and less than or equal to Hh3, the central processor adjusts the dosing amount of the PFS tank to Ga3 and adjusts the dosing amount of the PAM tank to Gb 3;

when the Hh is more than Hh3 and less than or equal to Hh4, the central processor adjusts the dosing amount of the PFS tank to Ga4 and adjusts the dosing amount of the PAM tank to Gb 4;

when the sodium hypochlorite jar to when contact disinfection pond added sodium hypochlorite, water level gauge in the contact disinfection pond can detect water level Hc in the contact disinfection pond, detects the completion back, and central processing unit compares each item parameter in Hc and the Hc0 matrix:

when Hc is less than or equal to Hc1, the central processing unit adjusts the dosage of the sodium hypochlorite tank to Gc 1;

when Hc is more than Hc1 and less than or equal to Hc2, the central processing unit adjusts the chemical adding amount of the sodium hypochlorite tank to Gc 2;

when Hc is more than Hc2 and less than or equal to Hc3, the central processing unit adjusts the chemical adding amount of the sodium hypochlorite tank to Gc 3;

when Hc is more than Hc3 and less than or equal to Hc4, the central processing unit adjusts the chemical adding amount of the sodium hypochlorite tank to Gc 4.

Further, the anoxic tank is provided with a bottom aeration device for aerating the anoxic tank.

Further, the contact oxidation pond contains nitrifying bacteria for converting ammonia nitrogen in the sewage into nitrate nitrogen.

Further, the anoxic pond contains denitrifying bacteria for denitrifying and reducing the nitrate nitrogen flowing back from the contact oxidation pond.

Compared with the prior art, the sludge control system has the beneficial effects that the central processing unit is added in the system, the water level in the designated water pool is detected, and the corresponding blower operation parameter and the corresponding dosing amount of the dosing tank are selected according to the detection result, so that the sludge control of the system can be effectively improved.

Particularly, when the ammonia nitrogen in the sewage exceeds the standard, the aeration pipe valve of the anoxic tank can be opened to aerate the anoxic tank, and meanwhile, the backflow of the mixed liquid in the contact oxidation tank is stopped, so that the safety of the anoxic tank in sewage treatment can be effectively protected.

Particularly, the third pump can convey the sludge in the vertical sedimentation tank to a sludge tank and an anoxic tank, and can effectively meet the requirements of sludge activity and required microorganisms in the anoxic tank.

Particularly, the contact oxidation pond contains nitrifying bacteria, can quickly and effectively convert ammonia nitrogen in sewage into nitrate nitrogen, and simultaneously provides raw materials for the next step.

Particularly, the anoxic tank contains denitrifying bacteria, can effectively perform denitrifying reduction treatment on the converted nitrate nitrogen in the contact oxidation tank to generate nitrogen, and can effectively remove nitrogen from sewage.

Particularly, the coagulation reaction tank comprises a PFS tank and a PAM tank, and the PFS and the PAM contained in the coagulation reaction tank respectively can quickly flocculate and precipitate solutes, suspended matters and colloids in the sewage to reduce the phosphorus concentration in the sewage.

Especially, contact disinfection pond, it is equipped with the sodium hypochlorite jar, can bleach and disinfection treatment to sewage, is showing and has promoted water quality safety to reach emission standard.

Drawings

FIG. 1 is a schematic view of a process flow of denitrification and dephosphorization based on multi-effect medical sewage treatment according to the present invention.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Please refer to fig. 1, which is a schematic diagram of a system flow structure according to the present invention, and the system flow structure includes: the device comprises a mechanical grid 1, a regulating tank 2, a first air blower 3, a first pump 4, an anoxic tank 5, a contact oxidation tank 6, a second pump 7, a second air blower 8, a vertical flow sedimentation tank 9, a third pump 10, a coagulation reaction tank 11, a PFS tank 12, a PAM tank 13, an inclined tube sedimentation tank 14, a fourth pump 15, a contact disinfection tank 16, a sodium hypochlorite tank 17, a sludge tank 18 and a grid slag collection bag 19. One end of the mechanical grating 1 is connected with the adjusting tank 2, and the other end of the mechanical grating is connected with the grating residue collecting bag 19 for preliminarily intercepting sewage and removing floaters in the sewage. The adjusting tank 2 is connected with the mechanical grating 1 and is used for adjusting the water quantity or the water quality of the sewage in the adjusting tank 2; the first air blower 3 is connected with the adjusting tank 2 and used for delivering air to the adjusting tank 2 to stir sewage; the first pump 4 is connected with the adjusting tank 2 and is used for conveying the sewage in the adjusting tank 2 to the anoxic tank 5; the anoxic tank 5 is connected with the first pump 4, and denitrifying bacteria are arranged in the anoxic tank 5 and used for anoxic treatment in the anoxic tank 5; the contact oxidation pond 6 is connected with the anoxic pond 5, and a second air blower 8 is arranged at the bottom of the contact oxidation pond 6 and used for providing an oxygen source for the contact oxidation pond 6 so that nitrifying bacteria in the contact oxidation pond 6 can adsorb and degrade organic matters in the sewage in the contact oxidation pond 6; the second pump 7 is respectively connected with the contact oxidation tank and the anoxic tank 5 and is used for returning sewage in the contact oxidation tank 6 to the anoxic tank 5; the vertical flow sedimentation tank 9 is connected with the contact oxidation tank 6 and is used for carrying out sludge-water separation on the sewage in the vertical flow sedimentation tank 9; one end of the pipeline of the third pump 10 is connected with the vertical flow sedimentation tank 9, and the other end is respectively connected with the sludge tank 18 and the anoxic tank 5, so as to respectively convey the sludge in the vertical flow sedimentation tank 9 to the sludge tank 18 and the anoxic tank 5. And the coagulation reaction tank 11 is connected with the vertical flow sedimentation tank 9 and is used for coagulating colloid and fine suspended matters in the sewage in the coagulation reaction tank 11 into floccules. The inclined tube sedimentation tank 14 is connected with the coagulation reaction tank 11 and is used for settling flocculate in the coagulation reaction tank 11; a fourth pump 15, one end of which is connected with the outlet of the inclined tube sedimentation tank 14 and the other end is connected with the inlet of the sludge tank, and is used for conveying flocculate in the inclined tube sedimentation tank 14 to the sludge tank 18; the contact disinfection tank 16 is connected with the inclined tube sedimentation tank 14, and a PFS tank and a PAM tank are arranged in the inclined tube sedimentation tank 14 and are used for disinfecting and bleaching sewage in the contact disinfection tank 16; the sludge tank 18 is respectively connected with the third pump 10 and the fourth pump 15 and is used for storing the sludge output by the third pump 10 and the fourth pump 15.

When the device is used, the mechanical grating 1 intercepts sewage and removes floating materials in the sewage, the intercepted sewage enters the adjusting tank 2, and the first air blower 3 blows air to the adjusting tank 2 so that the adjusting tank 2 primarily adjusts and separates the sewage in the adjusting tank 2; after the adjustment is finished, the sewage which is subjected to the adjustment is conveyed to an anoxic tank 5 by a first pump 4, denitrifying bacteria in the anoxic tank 5 decompose and convert macromolecular organic matters in the sewage into organic acid and micromolecular compounds, the sewage enters a contact oxidation tank 6 after the decomposition is finished, a biological membrane in the contact oxidation tank 6 filters the sewage, and filtered residues are settled to the bottom of the contact oxidation tank 6; after the filtration is finished, the second blower 8 aerates the contact oxidation tank 6 to ensure that the nitrobacteria in the contact oxidation tank 6 are subjected to nitrification treatment, after the treatment is finished, the second pump 7 returns nitrate generated by the nitrobacteria to the anoxic tank 5, denitrifying bacteria in the anoxic tank 5 are subjected to denitrification reduction treatment to convert the nitrate into nitrogen, the rest sewage enters the vertical flow sedimentation tank 9 through the contact oxidation tank 6 to be subjected to mud-water separation, the precipitated sludge is conveyed into the sludge tank 18 through the third pump 10, meanwhile, part of the sludge is conveyed into the anoxic tank 5, the sewage separated from the vertical flow sedimentation tank 9 enters the coagulation reaction tank 11, the sewage in the coagulation reaction tank is subjected to flocculation treatment through the PFS medicament in the PFS tank 12 and the PAM medicament in the PAM tank 13, the sewage enters the inclined tube sedimentation tank 14 to be subjected to sedimentation separation treatment after the flocculation is finished, the alum blossom after flocculation will be directly carried sludge impoundment 18 through fourth pump 15, and remaining sewage gets into contact disinfection pond 16, and when sewage got into disinfection pond 16, the sodium hypochlorite medicament in the sodium hypochlorite jar 17 was added in order to disinfect bleaching treatment to sewage to carry out the effluent after reaching standard and discharge.

As shown in fig. 1, the mechanical grating 1 is disposed at the sewage inlet channel of the pump station, and includes a grating, a wire rope, a tooth rake, a grating frame, a guide rail, a roller, a foot screw, and a metal bar member, for primarily intercepting and raking the floating objects in the sewage. When the system is operated, the mechanical grating 1 is used for primarily intercepting floating objects in the sewage and then directly sending the intercepted floating objects into the grating residue collecting bag 19, and the remaining sewage enters the regulating tank 2. The mechanical grating 1 can effectively remove floating objects and improve the purification effect. It will be appreciated that the internal structural elements of the mechanical grid 1 may be added or subtracted physically, as long as the preliminary interception of the medical effluent is satisfied, with the preliminary interception of the float.

With reference to fig. 1, the adjusting tank 2 is connected to the mechanical grid 1 for adjusting the amount of sewage and the quality of sewage. When the system is operated, under the condition of regulating the water quantity, the sewage filtered by the mechanical grating 1 enters the regulating tank, and the highest and lowest water levels of the sewage do not exceed preset values, generally 2-3 m. When the water quality is regulated, the regulating tank 2 takes a forced regulating measure of air stirring for the first air blower 3. The adjusting tank adjusting equipment is simple to operate and good in operation effect. It can be understood that in the specific operation process, the structure of the regulating reservoir can be circular or polygonal, can be built underground or on the ground, can be of a stone structure or a steel bar and other structures, and can be used for the functions of preliminary sedimentation, water quality and quantity regulation and accident buffering.

As shown in fig. 1, the first blower 3 is connected to the adjusting tank 2, and includes a motor, an impeller, a muffler, an exhaust pipe, a frequency converter, and a filter, and is used for delivering air to the adjusting tank 2 to stir the sewage. When the system is operated, the first air blower 3 delivers air generated by the first air blower into the conditioning tank 2 and stirs the sewage in the conditioning tank 2. Can effectively promote the regulation effect to equalizing basin 2. It is understood that the blower may be separately provided in the blower room for soundproofing or unified management as long as it is satisfied with the remote operation of the conditioning tank.

With continued reference to fig. 1, the first pump 4 is disposed at the water outlet of the regulating reservoir 2 and connected to the anoxic reservoir 5, and includes: an impeller and a water pumping chamber for conveying the sewage in the adjusting tank 2 to the anoxic tank 5. When the system is running, the first pump will transfer the sewage in the regulating reservoir 2 to the anoxic reservoir 5.

As shown in fig. 1, the anoxic tank 5 is connected to the first pump 4, and the anoxic tank 4 contains denitrifying bacteria therein for adsorbing sludge in the anoxic tank 5 and degrading organic substances in the sewage; when the system is operated, the denitrifying bacteria in the anoxic tank 4 can adsorb sludge in the sewage in the anoxic tank 4 and degrade organic matters in the sewage. Meanwhile, a standby aeration device is arranged at the bottom of the anoxic tank 4 and used for conveying air to the anoxic tank to stir sewage.

Specifically, the standby aeration device at the bottom of the anoxic tank 4 can be opened according to the final effluent ammonia nitrogen and total nitrogen reaching the standard, when the ammonia nitrogen in the sewage in the anoxic tank 4 is too high and the effluent ammonia nitrogen has an excessive risk, an aeration pipe valve of the anoxic tank 4 can be opened to aerate the anoxic tank 4, and meanwhile, the backflow of the mixed liquid in the contact oxidation tank 6 is stopped.

Referring to fig. 1, the contact oxidation pond 6 is connected to the anoxic pond 5, and includes a biological membrane, a water inlet, a water outlet, and an aeration port, wherein the contact oxidation pond 6 contains nitrifying bacteria and a biological membrane for partially removing pollutants in the sewage, and the contact oxidation pond 6 contains nitrifying bacteria for nitrifying the sewage. When the system is operated, firstly, sewage entering the contact oxidation pond 6 from the anoxic pond 4 is in wide contact with the biological membrane, pollutants are further purified under the action of metabolism of the sewage and the biological membrane, secondly, the purified sewage obtained from the biological membrane is subjected to contact reaction with nitrobacteria contained in the contact oxidation pond 6, so that ammonia in the sewage is converted into nitrite, and finally the nitrite is oxidized into nitrate and enters the third pump 10. Can effectively save time and power consumption, and has the characteristics of good purification effect and no sludge expansion.

Specifically, the contact oxidation tank 6 is filled with a large amount of filler before use, most of the filler is made of honeycomb-shaped seasonings such as glass cloth and plastic, and when the filler is arranged, the filler is required to be fully covered with a biological membrane so as to be in wide contact with sewage in the tank, so that the filler is effectively purified.

With continued reference to fig. 1, the second pump 7 is connected to the contact oxidation cell 6 and includes: impeller and pumping chamber. For returning the nitrate treated in the contact oxidation pond 6 to the anoxic pond 5 through a second pump 7. When the system is running, the second pump 7 will deliver nitric acid and associated wastewater from the contact oxidation tank 6 to the anoxic tank 5.

Specifically, the nitric acid which flows back to the anoxic tank 5 in the contact oxidation tank 6 can be subjected to denitrification treatment by denitrifying bacteria in the anoxic tank to release nitrogen, so that the aim of removing nitrogen is fulfilled.

Referring to fig. 1, the second blower 8 is connected to the contact oxidation tank 6 and the anoxic tank 5, and includes a motor, an impeller, a muffler, an exhaust pipe, a frequency converter, and a filter, and is used to deliver air to the contact oxidation tank 6 and the anoxic tank 5, respectively, and agitate sewage. When the system is operated, first, the second blower 8 supplies the air generated by the second blower to the anoxic tank 5 and the contact oxidation tank 6. It is understood that the blower may be separately provided in the blower room for sound insulation or unified management as long as it is satisfied with remote operation of the contact oxidation tank and the anoxic tank.

As shown in fig. 1, the vertical flow sedimentation tank 9 is connected to the contact oxidation tank 6, and includes a baffle plate, a water inlet channel, a water outlet pipe, a conical mud settling hopper, a mud pipe, a scum trough, a baffle plate, an overflow weir, and a mud pipe, for separating mud from water in the sewage treatment in the vertical flow sedimentation tank 9. When the system operates, sewage which is treated by nitrogen removal from the contact oxidation tank 6 is bred through the water inlet channel and then enters the vertical flow sedimentation tank 9, the umbrella-shaped baffle is arranged under the pipe to ensure that the sewage is uniformly distributed in the tank and then slowly rises along the whole water passing section, suspended matters are settled and enter the conical sedimentation bucket at the bottom of the tank, clear water flows out from the periphery of the tank along the peripheral overflow weir, and the baffle and the scum groove are arranged in front of the weir in the vertical flow sedimentation tank 9 to intercept scum so as to ensure the quality of the effluent water. One side of the vertical flow sedimentation tank 9 is provided with a mud pipe close to the tank wall, and mud is discharged periodically by hydrostatic pressure.

With continued reference to fig. 1, the third pump 10 is connected to the vertical sedimentation tank 9, the sludge tank 18 and the anoxic tank, respectively, and includes an impeller and a pumping chamber. For conveying the sludge in the vertical sedimentation tank 9 to the sludge tank 18, while the third pump 10 can return the rest of the sludge to the anoxic tank 5 for increasing the sludge activity and concentration thereof.

Specifically, the third pump 10 delivers the sludge in the vertical flow sedimentation tank to the anoxic tank 5, and the delivery amount of the sludge can be actually adjusted according to the concentration of the sludge in the anoxic tank 5.

With continued reference to fig. 1, the coagulation reaction tank 11 is connected to the vertical sedimentation tank 9, and includes the PFS tank 12, the PAM tank 13, and a water inlet and a water outlet. The device is used for purifying some solutes, colloids and other substances in the sewage of the coagulation reaction tank. When the system operates, PFS and PAM are added into the coagulation reaction tank 11, alum floc is formed in coagulation of PFS and PAM in sewage, and floc with larger particles is formed through adsorption, tape winding and other actions, so that sewage is further purified.

Referring to fig. 1, the inclined tube sedimentation tank 14 is connected to the coagulation reaction tank 11, and includes an inclined tube and a branch tube for sedimentation and separation of alum in the coagulation reaction tank 11. When the system is in operation, the inclined tube sedimentation tank 14 divides the alum blossom precipitate in the coagulation reaction tank 11 into a series of shallow sedimentation layers by using inclined tubes or branch tubes, and the treated and settled precipitate moves and separates mutually in each sedimentation shallow layer. Can effectively separate alum blossom in the coagulation reaction tank 11.

With continued reference to fig. 1, the fourth pump 15 is connected to the inclined tube sedimentation tank 14 and includes an impeller and a pumping chamber. For conveying alum flocs in the inclined-tube sedimentation tank 14 to a sludge tank 18. When the system is running, the fourth pump 15 will transfer the alum flocs in the inclined tube sedimentation tank 14 to the sludge tank 18.

With continued reference to fig. 1, the contact disinfection tank 17 is connected to the inclined tube sedimentation tank 9, and includes the sodium hypochlorite tank 16 and a water inlet and outlet for bleaching and disinfecting the wastewater in the contact disinfection tank 17. When the system is operated, the sodium hypochlorite agent in the sodium hypochlorite tank 16 enters the sewage in the contact disinfection tank 17 through the water inlet to bleach and disinfect, and pathogenic microorganisms in the sewage are killed. When the sewage is disinfected to reach the standard, the effluent can be discharged. The efficiency of promotion bleaching and disinfection that sodium hypochlorite can show. It is understood that other disinfecting solutions may be included in the contact disinfection tank 17, as long as acceptable bleaching and disinfection of the wastewater is achieved.

With continued reference to fig. 1, the sludge tank 18 is connected to the third pump 10 and the fourth pump 15, respectively, for storing and managing sludge. When the system is in operation, the sludge tank 18 receives and stores the sludge discharged from the third pump 10 and the sediment discharged from the fourth pump 15. The arrangement of the sludge tank 18 can effectively reduce the environmental pollution.

As shown in fig. 1, the system of the present invention further includes a central processing unit (not shown), which is connected to each of the blowers, the dosing tank in the coagulation reaction tank, and the dosing tank in the contact disinfection tank, respectively, for controlling the operation parameters of each blower and the dosing amount of the dosing tank according to the water level in the corresponding tank, so as to make the system perform efficient nitrogen and phosphorus removal on the sewage; specifically, water level meters (not shown in the figure) are arranged in the regulating tank, the anoxic tank, the contact oxidation tank, the coagulation reaction tank and the contact disinfection tank, and are used for respectively detecting the water level in each water tank.

Specifically, a first preset water level matrix group Ha (Ht0, Hq0, Hj0) is arranged in the central processor, wherein Ht0 is a regulating pond preset water level matrix, Hq0 is an anoxic pond preset water level matrix, and Hj0 is a contact oxidation pond preset water level matrix; for the adjusting tank preset water level matrixes Ht0, Ht0(Ht1, Ht2, Ht3, Ht4), wherein Ht1 is a first adjusting tank preset water level, Ht2 is a second adjusting tank preset water level, Ht3 is a third adjusting tank preset water level, and Ht4 is a fourth adjusting tank preset water level; for the anoxic pond, a preset water level matrix Hq0, Hq0(Hq1, Hq2, Hq3, Hq4) is provided, wherein Hq1 is a first preset water level of the anoxic pond, Hq2 is a second preset water level of the anoxic pond, Hq3 is a third preset water level of the anoxic pond, and Hq4 is a fourth preset water level of the anoxic pond; and (3) regarding a contact oxidation pond preset water level matrix Hj0, Hj0(Hj1, Hj2, Hj3 and Hj4), wherein Hj1 is a first preset water level of the contact oxidation pond, Hj2 is a second preset water level of the contact oxidation pond, Hj3 is a third preset water level of the contact oxidation pond, and Hj4 is a fourth preset water level of the contact oxidation pond.

Specifically, the central processing unit is also provided with a first blower preset operation matrix group Fa and a second blower preset operation matrix group Fb; presetting operation matrix groups Fa and Fa (Fa1, Fa2, Fa3 and Fa4) for the first blower, wherein Fa1 is a first preset operation matrix of the first blower, Fa2 is a second preset operation matrix of the first blower, Fa3 is a third preset operation matrix of the first blower, and Fa4 is a fourth preset operation matrix of the first blower; for the preset operation matrix Fai for the ith blower, i is 1, 2, 3, 4, Fai (Pai, Tai), where Pai is the ith preset power of the first blower and Tai is the ith preset duration of the first blower; for a second blower preset operation matrix group, Fb (Fb1, Fb2, Fb3, Fb4), wherein Fb1 is a second blower first preset operation matrix, Fb2 is a second blower second preset operation matrix, Fb3 is a second blower third preset operation matrix, and Fb4 is a second blower fourth preset operation matrix; for the preset operation matrix Fai, Fai (Pai, Tai) for the ith second blower, where Pai is the ith preset power for the ith second blower and Tai is the ith preset duration for the ith second blower.

when Ht3 is more than Ht and less than or equal to Ht4, the central processing unit adjusts the operation power of the first blower to Pa4 and adjusts the operation time of the first blower to Ta 4.

when Hq3 < Hq ≦ Hq4, the CPU adjusts the operating power of the second blower to Pb4 and the operating time period of the second blower to Tb 4.

Specifically, a second preset water level matrix group Hb (Hh0, Hc0) is further arranged in the central processing unit, wherein Hh0 is a preset water level matrix of the coagulation reaction tank, and Hc0 is a preset water level matrix of the contact disinfection tank; for the coagulation reaction tank, a preset water level matrix Hh0, Hh0(Hh1, Hh2, Hh3 and Hh4) is provided, wherein Hh1 is a first preset water level of the coagulation reaction tank, Hh2 is a second preset water level of the coagulation reaction tank, Hh3 is a third preset water level of the coagulation reaction tank, and Hh4 is a fourth preset water level of the coagulation reaction tank; for the contact disinfection tank predetermined water level matrices Hc0, Hc0(Hc1, Hc2, Hc3, Hc4), where Hc1 is the first predetermined water level in contact with the disinfection tank, Hc2 is the second predetermined water level in contact with the disinfection tank, Hc3 is the third predetermined water level in contact with the disinfection tank, and Hc4 is the fourth predetermined water level in contact with the disinfection tank.

Specifically, the central processing unit is further provided with a preset dosing amount matrix group G0(Ga, Gb, Gc), wherein Ga is a preset dosing matrix of the PFS tank, Gb is a preset dosing matrix of the PAM tank, Gc is a preset dosing matrix of the sodium hypochlorite tank, and for the PFS tank, the dosing matrices Ga, Ga (Ga1, Ga2, Ga3, Ga4) are preset, wherein Ga1 is a first preset dosing amount of the PFS tank, Ga2 is a second preset dosing amount of the PFS tank, Ga3 is a third preset dosing amount of the PFS tank, and Ga4 is a fourth preset dosing amount of the PFS tank; a Gb and Gb (Gb1, Gb2, Gb3 and Gb4) are preset for a PAM tank, wherein the Gb1 is a first preset medicine adding amount of the PAM tank, the Gb2 is a second preset medicine adding amount of the PAM tank, the Gb3 is a third preset medicine adding amount of the PAM tank, and the Gb4 is a fourth preset medicine adding amount of the PAM tank; and presetting a medicine adding matrix Gc (Gc1, Gc2, Gc3 and Gc4) for the sodium hypochlorite tanks, wherein Gc1 is a first preset medicine adding amount of the sodium hypochlorite tanks, Gc2 is a second preset medicine adding amount of the sodium hypochlorite tanks, Gc3 is a third preset medicine adding amount of the sodium hypochlorite tanks, and Gc4 is a fourth preset medicine adding amount of the sodium hypochlorite tanks.

when the Hh is more than Hh3 and less than or equal to Hh4, the central processor adjusts the dosing amount of the PFS tank to Ga4 and the dosing amount of the PAM tank to Gb 4.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A denitrification and dephosphorization process based on multi-effect medical sewage treatment is characterized by comprising the following steps:

2. The process of claim 1, wherein a first predetermined water level matrix set Ha (Ht0, Hq0, Hj0) is provided in the cpu, wherein Ht0 is a predetermined water level matrix for the equalizing basin, Hq0 is a predetermined water level matrix for the anoxic basin, and Hj0 is a predetermined water level matrix for the contact oxidation basin; for the adjusting tank preset water level matrixes Ht0, Ht0(Ht1, Ht2, Ht3, Ht4), wherein Ht1 is a first adjusting tank preset water level, Ht2 is a second adjusting tank preset water level, Ht3 is a third adjusting tank preset water level, and Ht4 is a fourth adjusting tank preset water level; for the anoxic pond, a preset water level matrix Hq0, Hq0(Hq1, Hq2, Hq3, Hq4) is provided, wherein Hq1 is a first preset water level of the anoxic pond, Hq2 is a second preset water level of the anoxic pond, Hq3 is a third preset water level of the anoxic pond, and Hq4 is a fourth preset water level of the anoxic pond; for a contact oxidation pond preset water level matrix Hj0, Hj0(Hj1, Hj2, Hj3 and Hj4), wherein Hj1 is a first preset water level of the contact oxidation pond, Hj2 is a second preset water level of the contact oxidation pond, Hj3 is a third preset water level of the contact oxidation pond, and Hj4 is a fourth preset water level of the contact oxidation pond;

3. The denitrification and dephosphorization process based on the multi-effect medical sewage treatment of claim 1, wherein the coagulation reaction tank comprises:

4. The denitrification and dephosphorization process based on the multi-effect medical sewage treatment of claim 3, wherein a sodium hypochlorite tank is arranged in the contact disinfection tank, and sodium hypochlorite is filled in the sodium hypochlorite tank for bleaching and disinfecting sewage.

5. The process of claim 4, wherein a second predetermined water level matrix group Hb (Hh0, Hc0) is further disposed in the CPU, wherein Hh0 is a predetermined water level matrix of the coagulation reaction tank, and Hc0 is a predetermined water level matrix of the contact disinfection tank; for the coagulation reaction tank, a preset water level matrix Hh0, Hh0(Hh1, Hh2, Hh3 and Hh4) is provided, wherein Hh1 is a first preset water level of the coagulation reaction tank, Hh2 is a second preset water level of the coagulation reaction tank, Hh3 is a third preset water level of the coagulation reaction tank, and Hh4 is a fourth preset water level of the coagulation reaction tank; for the contact disinfection tank preset water level matrix Hc0, Hc0(Hc1, Hc2, Hc3, Hc4), wherein Hc1 is the first preset water level of the contact disinfection tank, Hc2 is the second preset water level of the contact disinfection tank, Hc3 is the third preset water level of the contact disinfection tank, and Hc4 is the fourth preset water level of the contact disinfection tank;

6. The process of claim 1, wherein the anoxic tank is provided with a bottom aeration device for aeration of the anoxic tank.

7. The process of claim 1, wherein the contact oxidation tank contains nitrifying bacteria for converting ammonia nitrogen in the wastewater into nitrate nitrogen.

8. The process of claim 1, wherein the anoxic tank contains denitrifying bacteria for denitrifying and reducing the nitrate nitrogen flowing back from the contact oxidation tank.