CN111470723A - Urban sewage treatment system and treatment method - Google Patents
Urban sewage treatment system and treatment method Download PDFInfo
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- CN111470723A CN111470723A CN202010300780.7A CN202010300780A CN111470723A CN 111470723 A CN111470723 A CN 111470723A CN 202010300780 A CN202010300780 A CN 202010300780A CN 111470723 A CN111470723 A CN 111470723A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The application discloses a municipal sewage treatment system and a treatment method, and belongs to the technical field of sewage treatment. The system comprises: a mixing pool: nutrient solution and carbon source are added in the sewage treatment device for mixing the sewage to be treated from upstream, the nutrient solution and the carbon source; the biological reaction device comprises: is arranged at the downstream of the mixing tank, a carrier of the biological reaction device is attached with a bacillus microbial film, and the bacillus microbial film is used for preliminarily removing COD and NH in the sewage to be treated aiming at the effluent from the mixing tank4 +-N and TN; an aeration tank: arranged at the downstream of the biological reaction device, a flora which takes bacillus microorganisms as dominant bacteria is added into the aeration tank and is used for removing the sewage to be treated and carrying out nitration treatment, so that the residual COD and NH in the sewage are treated4 +-N and TN are removed; an aeration mechanism: a carrier for providing the required dissolved oxygen amount for the aeration tank and purging the biological reaction device. The method is realized based on the system. It can realize the high-efficient purification treatment to municipal sewage.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a municipal sewage treatment system and a treatment method.
Background
The urban sewage is wastewater discharged by residents in daily life and mainly comes from residential buildings and public buildings. The urban sewage is mainly characterized by containing a large amount of unstable organic matters and pathogenic microorganisms, N, P in the urban sewage is monitored to be seriously overproof in recent years, wherein the unstable organic matters are easy to generate stink, a large amount of pathogenic microorganisms can cause epidemic spread, and the excessive discharge of N, P can cause eutrophication of water bodies. Therefore, the problem of municipal sewage treatment becomes a hot spot and a difficulty in the current sewage treatment field.
In the prior art, the municipal sewage is mainly treated by a traditional biological method, so that the occupied resources are more, and the decomposition rate of microorganisms in the system is low during biochemical treatment, which easily causes the accumulation of microorganisms in the municipal sewage to cause malodor.
Disclosure of Invention
In view of the above, the present invention provides a municipal sewage treatment system and a treatment method thereof, which can realize efficient purification treatment of municipal sewage, thereby reducing malodor caused by accumulation of microorganisms therein, and thus being more practical.
In order to achieve the first purpose, the technical scheme of the municipal sewage treatment system provided by the invention is as follows:
the municipal sewage treatment system provided by the invention comprises:
a mixing pool: nutrient solution and carbon source are added in the sewage treatment device for mixing the sewage to be treated from upstream, the nutrient solution and the carbon source;
the biological reaction device comprises: a bacillus microbial film is arranged at the downstream of the mixing tank and attached to a carrier of the biological reaction device, and the bacillus microbial film is used for preliminarily removing COD and NH in the sewage to be treated aiming at the effluent from the mixing tank4 +-N and TN;
an aeration tank: arranged at the downstream of the biological reaction device, a flora taking bacillus microorganisms as dominant strains is added into the aeration tank, and the flora is used for removing the sewage to be treatedNitrifying to obtain residual COD and NH4 +-N and TN are removed;
an aeration mechanism: and a carrier for providing the required dissolved oxygen amount for the aeration tank and purging the biological reaction device.
In order to achieve the second object, the technical scheme of the municipal sewage treatment method provided by the invention is as follows:
the municipal sewage treatment method provided by the invention is realized based on the municipal sewage treatment system provided by the invention.
The municipal sewage treatment system and the treatment method select the biological reaction device and utilize the bacillus microorganism attached on the biological reaction device to primarily remove COD and NH in the sewage to be treated4 +-N and TN, and then removing residual COD and NH in the sewage to be treated by using flora which takes bacillus microorganisms as dominant strains and is added into the aeration tank4 +-N and TN, COD and NH in the effluent obtained after the treatment of the municipal sewage to be treated4 +The content of-N and TN meets the requirements of the subsequent membrane advanced treatment or other advanced treatment processes, wherein the nutrient solution is used by the bacillus microorganisms, and the carbon source is used by other microorganisms in the sewage to be treated. In addition, because the aeration mechanism also purges the carrier of the biological reaction device in the application process, the microbial film attached to the carrier can be at least partially separated, and the attachment amount of the microbial film on the carrier can be reduced, so that the application stability of the municipal sewage treatment system provided by the invention can be enhanced.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings.
In the drawings:
FIG. 1 is a schematic diagram showing the relationship between treatment tanks in a municipal sewage treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a connection relationship between treatment tanks in the municipal sewage treatment system according to the embodiment of the invention;
FIG. 3 is a partial sectional view of the entire structure of a rotary disk type bioreactor according to an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion B of FIG. 3;
FIG. 5 is a sectional view taken along line H-H of FIG. 3;
FIG. 6 is an M-directional view of FIG. 3;
FIG. 7 is an N-directional view of FIG. 3;
FIG. 8 is a top view of a diaphragm assembly series mechanism and its structure cooperating with a driving shaft and a driven shaft, which are applied to a rotating disc type biological reaction apparatus according to an embodiment of the present invention;
FIG. 9 is a perspective view of a lower casing used in a rotary disk type biological reaction apparatus according to an embodiment of the present invention;
FIG. 10 is an enlarged view of portion C of FIG. 9;
FIG. 11 is a schematic structural view of an upper housing applied to a rotating disc type bioreactor according to an embodiment of the present invention in one direction;
FIG. 12 is a schematic structural view of a membrane used in a rotating disk type bioreactor according to an embodiment of the present invention in one direction;
FIG. 13 is a sectional view taken along line A-A of FIG. 12;
FIG. 14 is an enlarged fragmentary view of portion F of FIG. 13;
FIG. 15 is a perspective view of an aeration tube assembly for use in a rotating disc bioreactor according to an embodiment of the present invention;
FIG. 16 is an enlarged view of a portion D of FIG. 15 (the air port 32 and the on-off valve 33 of the aeration tube 28);
FIG. 17 is an enlarged view of portion E of FIG. 15;
FIG. 18 is a schematic structural diagram of a membrane support rod positioning mechanism applied to a rotating disc type bioreactor according to an embodiment of the present invention;
FIG. 19 is a view showing the assembly of a membrane support tray used in a rotary disk type bioreactor according to an embodiment of the present invention;
FIG. 20 is a schematic structural view of a moment arm in one direction for use in a rotating disk type bioreactor according to an embodiment of the present invention;
FIG. 21 is a schematic structural view of a moment arm fixing pin applied to a rotating disk type bioreactor according to an embodiment of the present invention in one direction;
FIG. 22 is a flow chart showing the steps of a method for operating a carousel-type bioreactor according to an embodiment of the present invention;
FIG. 23 is a schematic view showing a first trend of the change of the rotation speed of the membrane module with time during the operation of the rotating disk type bioreactor according to the embodiment of the present invention;
FIG. 24 is a schematic view showing a second trend of the rotation speed of the membrane module with time during the operation of the rotating disk type bioreactor according to the embodiment of the present invention;
FIG. 25 is a schematic structural view of a carousel-type biological reaction apparatus according to an embodiment of the present invention, in which the housing is replaced with an upper housing and a tank body (wherein, an aeration apparatus is not shown);
FIG. 26 is an enlarged view of a portion K of FIG. 25;
FIG. 27 is a schematic view showing a structure in which two treatment tanks of the biological reaction apparatus are used in combination;
wherein, in FIG. 2, A1-coarse grid; a2-coarse grid lifting pool; a3-coarse grid lift pump; a4-fine grid; a5-grit chamber; A6-Sand-Water separator; a7-anaerobic pool; a8-mixing pool; a9-bioreactor; a10-aeration mechanism; a11-aeration tank; a12-stirring device; a13-aeration device; a14-nitrifying liquid reflux pump; a15-secondary sedimentation tank; a16-sludge recirculation pump; a17-a coagulating sedimentation tank; a18-filter tank; a19-disinfection pool; A20-DO dissolved oxygen instrument; a21-sludge pond; a22-sludge pump; a23-sludge dewatering device; a24-coarse grid treatment tank; a25-fine grid treatment basin.
Detailed Description
In view of the above, the present invention provides a municipal sewage treatment system and a treatment method thereof, which can realize efficient purification treatment of municipal sewage, thereby reducing malodor caused by accumulation of microorganisms therein, and thus being more practical.
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description of the system and method for treating municipal sewage according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.
Embodiment of urban sewage treatment system
Referring to fig. 1 and 2, the municipal sewage treatment system provided by the invention comprises:
a mixing pool: nutrient solution and carbon source are added in the sewage treatment device for mixing the sewage to be treated from the upstream;
the biological reaction device comprises: is arranged at the downstream of the mixing tank, wherein a carrier of the biological reaction device is attached with a bacillus microbial film which is used for preliminarily removing COD and NH in the sewage to be treated aiming at the effluent from the mixing tank4 +-N and TN;
an aeration tank: arranged at the downstream of the biological reaction device, a flora which takes bacillus microorganisms as dominant bacteria is added into the aeration tank and is used for removing the sewage to be treated and carrying out nitration treatment, so that the residual COD and NH in the sewage are treated4 +-N and TN are removed;
an aeration mechanism: a carrier for providing the required dissolved oxygen amount for the aeration tank and purging the biological reaction device.
The municipal sewage treatment system and the treatment method select the biological reaction device and utilize the bacillus microorganism attached on the biological reaction device to primarily remove COD and NH in the sewage to be treated4 +-N and TN, and then removing residual COD and NH in the sewage to be treated by using flora which takes bacillus microorganisms as dominant strains and is added into the aeration tank4 +-N and TN, COD and NH in the effluent obtained after the treatment of the municipal sewage to be treated4 +The content of-N and TN meets the requirements of the subsequent membrane advanced treatment or other advanced treatment processes, wherein the nutrient solution is used by the bacillus microorganisms, and the carbon source is used by other microorganisms in the sewage to be treated. In addition, because the aeration mechanism also purges the carrier of the biological reaction device in the application process, the microbial film attached to the carrier can be at least partially separated, and the attachment amount of the microbial film on the carrier can be reduced, so that the application stability of the municipal sewage treatment system provided by the invention can be enhanced. In addition, before the sewage to be treated enters the biological reaction device, the sewage to be treated from the upstream is firstly mixed with the nutrient solution and the carbon source in the mixing tank, so that the uniform distribution of the nutrient solution and the carbon source in the sewage to be treated can be ensured, wherein the nutrient solution is mainly utilized by downstream bacillus microorganisms, and the carbon source is mainly utilized by other microorganisms in the sewage to be treated, so that the sewage treatment effect can be better ensured.
The municipal sewage treatment system provided by the embodiment of the invention further comprises:
solid waste filtering device: used for filtering solid waste in the sewage to be treated. A grit chamber: and the solid waste filtering device is arranged at the downstream of the solid waste filtering device and is used for precipitating sediments in the effluent passing through the solid waste filtering device. An anaerobic tank: and the mixing tank is arranged at the downstream of the grit chamber and at the upstream of the mixing tank and is used for treating the effluent passing through the grit chamber. The three treatment processes are all pretreatment tanks, which can reduce solid matters in the sewage to be treated as much as possible and avoid obstacles encountered when the sewage to be treated enters the biological reaction device.
A secondary sedimentation tank: and the water treatment device is arranged at the downstream of the aeration tank and is used for carrying out sludge-water separation on the effluent from the aeration tank. A post-processing system: and the secondary sedimentation tank is arranged at the downstream of the secondary sedimentation tank and is used for carrying out post-treatment on the effluent from the secondary sedimentation tank so that the obtained effluent meets the discharge standard. Both of these processes are post-treatment tanks, which enable the final effluent to meet discharge standards.
Wherein, solid waste filter equipment includes: a coarse grid treatment tank: the interior of the sewage treatment device is provided with a coarse grating for filtering solid wastes with the specification larger than meshes of the coarse grating in the sewage to be treated. A fine grid treatment tank: the fine grating is arranged in the sewage treatment device, is arranged at the downstream of the coarse grating and is used for filtering solid wastes in the sewage to be treated, wherein the specifications of the solid wastes are larger than meshes of the fine grating but smaller than meshes of the coarse grating. The device can remove large solid pollutants in the urban sewage so as to avoid occupying the treatment volume of the subsequent treatment tank and enable the subsequent treatment tank to be better utilized.
Wherein, municipal sewage treatment system still includes: a coarse grid lifting pool: the coarse grid lifting pool is communicated with the coarse grids through meshes of the coarse grids; a lift pump: used for lifting the sewage to be treated in the coarse grating lifting tank to the fine grating treatment tank. In this embodiment, a coarse grid lifting tank is further disposed downstream of the coarse grid, so that a transition still exists between the coarse grid treatment tank and the fine grid treatment tank in the sewage to be treated which passes through the coarse grid, that is, the coarse grid lifting tank further eliminates solid pollutants with large specifications. In addition, because the meshes of the fine grid are smaller, a certain pressure difference exists between the upstream and the downstream of the fine grid, and the introduction of the lift pump can facilitate the sewage to be treated to permeate the fine grid.
Wherein, the municipal sewage treatment system still will include: nutrient solution feeding device: the mixing tank is used for adding nutrient solution into the mixing tank, and the nutrient solution can be utilized by the bacillus microorganism; a carbon source adding device: used for adding a carbon source into the mixing tank, wherein the carbon source can be utilized by microorganisms in the sewage to be treated. In this embodiment, the nutrient solution feeding device and the carbon source feeding device may be feeding pumps, and by using the feeding pumps, the nutrient solution and/or the carbon source may be respectively fed into the mixing tank and the aeration tank according to the value range of the feeding amount, and a pumping feeding manner is adopted, so that the cost is low, and the implementation is easy.
The aeration tank is communicated with the mixing tank, so that the digestive juice obtained after the treatment in the aeration tank can flow back to the mixing tank, wherein the back flow of the sewage to be treated is realized by a nitrifying liquid back-flow pump; the reflux quantity of the nitrifying liquid is 0-8 times of the designed water quantity. In this case, since the sewage to be treated obtained after the treatment in the aeration tank is returned to the mixing tank, the circulation treatment can be performed, and thereby the COD and NH can be treated4 +The further removal of N and TN can further enhance COD and NH in the sewage to be treated4 +The removal effect of N and TN.
The secondary sedimentation tank is communicated with the anaerobic tank, so that part of sludge obtained after treatment in the secondary sedimentation tank can flow back to the mixing tank, wherein the part of sludge flows back through the sludge reflux pump; the return flow of partial sludge is 0-4 times of the designed water amount. In this case, the sludge obtained from the secondary sedimentation tank is returned to the mixing tank, and COD and NH in the sludge returned to the mixing tank are further removed in a circulating manner4 +N and TN to COD and NH in the sewage to be treated4 +The removal effect of-N and TN is better.
Wherein, municipal sewage treatment system still includes: a sludge treatment system: used for treating the sludge in the secondary sedimentation tank. In this embodiment, the sludge treatment system mainly comprises a sludge dewatering system: used for dehydrating the residual sludge obtained by mud-water separation in the sedimentation tank. In this case, the sludge obtained after dewatering is able to form a sludge cake, which is significantly reduced in volume, is easy to transport and facilitates other applications of the sludge cake, for example, as an organic fertilizer.
Wherein, the back-end processing system includes: a coagulating sedimentation tank: the flocculation sedimentation tank is arranged at the downstream of the secondary sedimentation tank and is used for flocculating and sedimentating the effluent from the secondary sedimentation tank; a filter tank: the system is arranged at the downstream of the coagulating sedimentation tank and is used for filtering the effluent from the coagulating sedimentation tank; a disinfection tank: and the water outlet pipe is arranged at the downstream of the filter tank and used for disinfecting the water outlet from the filter tank, and the water outlet treated by the disinfection tank meets the discharge standard.
Wherein the microorganism of Bacillus is selected from one or more of Bacillus subtilis, Bacillus anthracis, Bacillus cereus, Bacillus thuringiensis, Bacillus licheniformis, Bacillus caustic, Bacillus sphaericus, Bacillus polymyxa, Bacillus macerans, etc., and the original loading of the microorganism of Bacillus is 100DCU/500m3-500DCU/500m3. In this case, the amount of the microorganisms of the genus Bacillus in the biological reaction apparatus and the aeration tank is sufficient to utilize the contaminants in the sewage to be treated as nutrients and degrade the contaminants in the sewage to be treated by metabolism in vivo, thereby achieving purification of the sewage to be treated.
Wherein, the value range of the volume ratio of the adding amount of the nutrient solution to the sewage to be treated entering the mixing tank is 1: 100000-1: 200000; the value range of the adding volume of the carbon source adding amount and the adding amount of the sewage to be treated entering the mixing tank is 6g/m3-12g/m3. Under the condition, the microorganisms in the sewage to be treated can well utilize the nutrient solution and the carbon source for metabolism, thereby ensuring the treatment effect of the sewage to be treated.
Wherein, the value ranges of the material composition and the weight portion of the nutrient solution comprise: leucine: 3-8 parts; serine: 5-10 parts; aspartic acid: 3-10 parts; vitamin B6: 0.1 to 0.3 portion; magnesium: 0.1-0.3 parts, water: 21.4 to 35.8 portions. In this case, the microorganisms of the genus Bacillus can metabolize the nutrient solution and other nutrients in the wastewater to be treated well, thereby improving the treatment effect of the wastewater to be treated.
Wherein the carbon source is selected from one of glucose, methanol and sodium acetate. In this case, the microorganisms in the wastewater to be treated can utilize the carbon source well for metabolism, thereby improving the treatment effect of the wastewater to be treated.
The value range of the specific surface area of the part of the carrier of the biological reaction device, which is directly positioned in the sewage to be treated, accounts for 40-45% of the total specific surface area of the carrier, and the value range of the rotating speed of the membrane component 11 is 3-6 r/min. Under the condition, the carrier can fully treat the sewage to be treated by utilizing the part of the carrier positioned in the sewage to be treated, and the part positioned in the sewage to be treated can also timely rotate to the position above the water surface to be fully contacted with air, so that the treatment effect of the sewage to be treated is further improved.
The value range of the dissolved oxygen content in the aeration tank is 0.01 mg/L-1.3 mg/L, and the value range of the retention time of the sewage to be treated in the aeration tank is 12h-20 h.
The municipal sewage treatment system provided by the embodiment of the invention further comprises: a stirring device: arranged in the aeration tank and used for stirring the sewage to be treated in the aeration tank. In this case, the stirring device can sufficiently stir the sewage to be treated in the aeration tank, thereby preventing the problem of reduced treatment capability caused by sludge precipitation due to formation of dead corners.
Referring to fig. 3-21, the rotating disc type bioreactor according to the embodiment of the present invention comprises a housing 51, a membrane module 11, a main transmission shaft 22, a secondary transmission shaft 20, a rotary power driving element 12 and an aeration device 18. The housing 51 has an accommodating space therein, and the housing 51 is provided with a water inlet and a water outlet. The main transmission shaft 22 is fixedly connected to one axial end of the diaphragm assembly 11, the auxiliary transmission shaft 20 is fixedly connected to the other axial end of the diaphragm assembly 11, and the diaphragm assembly 11 is arranged in the accommodating space through the main transmission shaft 22 and the auxiliary transmission shaft 20. The rotary power output shaft of the rotary power prime mover 12 is fixedly connected to the main drive shaft 22. The gas generated by the aeration device 18 can sweep the membrane module 11. The membrane module 11 is attached with a microorganism of the genus bacillus. In this case, the rotary disc type biological reaction apparatus utilizes the rotation of the rotary power driving part 12 to make the rotary power output shaft rotate, at this time, because the rotary power output shaft is fixedly connected with the main transmission shaft 22, the main transmission shaft 22 can rotate along with the rotary power output shaft, and then the membrane assembly 11 is driven to rotate along with the rotary power output shaft. In the rotating disc type biological reaction device provided by the invention, because the lowest position point of the diaphragm assembly 11 is lower than the bottom edges of the water inlet hole and the water outlet hole, when sewage to be treated is introduced into the shell 51, at least part of the diaphragm assembly 11 can contact the sewage to be treated, namely, on the diaphragm assembly 11, bacillus microorganisms attached to part of the diaphragm assembly 11 which contacts the sewage to be treated can take nutrient solution and other pollutants in the sewage to be treated as nutrient solution, and degrade the pollutants in the sewage to be treated through metabolism in vivo, thereby realizing the purification of the sewage to be treated. However, during the operation of the membrane module 11, as the treatment amount of the sewage to be treated increases, the microbial membrane is continuously suspended on the membrane module 11, and in a short time, the microbial membrane is loosely combined with the membrane module 11, so that the microbial membrane loosely combined with the membrane module 11 can be at least partially separated by purging the membrane module 11 through the aeration device 18, and after the aeration device 18 is added, the thickening speed of the microbial membrane attached to the membrane module 11 of the rotating disc type bioreactor provided by the invention can be obviously reduced, and therefore, the damage of the membrane module 11 caused by the overload operation of the membrane module 11 can be avoided. In this embodiment, in order to facilitate the coupling between the main transmission shaft 22 and the rotary power output shaft of the rotary power driving member 12, the main transmission shaft 22 and the rotary power output shaft of the rotary power driving member 12 are connected by a key 23.
In the embodiment, the value range of the specific surface area of the part of the membrane assembly 11 directly positioned in the sewage to be treated, which accounts for the total specific surface area of the carrier, is 40-45%, and the value range of the rotating speed of the membrane assembly 11 is 3-6 r/min. Under the condition, the carrier can fully treat the sewage to be treated by utilizing the part of the carrier positioned in the sewage to be treated, and the part positioned in the sewage to be treated can also timely rotate to the position above the water surface to be fully contacted with air, so that the treatment effect of the sewage to be treated is further improved.
Wherein the housing 51 includes an upper housing 4 and a lower housing 5. The upper shell 4 and the lower shell 5 are fixedly connected together to form an accommodating space. Under this condition, can make casing 4 and casing 5 down respectively, during the assembly, at first place assigned position with casing 5 down, then, with diaphragm assembly 11 and last casing 4 equipment back, hoist to casing 5 down on, it is provided with the connection respectively at hookup location with casing 5 down to go up casing 4 and casing 5 and prolongs the limit, then use bolt fastening connection can, in order to make go up casing 4 and diaphragm assembly 11 can hoist after the equipment more conveniently and target in place, can also set up hole for hoist 8 at the top of last casing 4, it can be the through-hole to change hole for hoist 8, also can be the blind hole, as long as hoist device's couple can stretch into can. Wherein, in order to make the accommodation space that forms after upper housing 4 assembles with lower housing 5 ventilate and do benefit to the observation, can also set up a plurality of shutter 7 on upper housing 4, the accommodation space that forms between upper housing 4 and the lower housing 5 can be through these a plurality of shutter 7 and external intercommunication.
Wherein, the water inlet and the water outlet are arranged on the upper edge of the lower shell 5. In this case, the accommodating space of the lower case 5 can be sufficiently utilized by the sewage to be treated, so that more sewage to be treated can be accommodated in the lower case 5 per unit time. In this embodiment, the upper housing 4 is integrally semi-cylindrical, and in this case, when the water inlet and the water outlet are disposed on the upper edge of the lower housing 5, a reasonable installation position can be provided for the installation of the diaphragm assembly 11, especially, when the diaphragm assembly 11 is just half immersed in the lower housing 5, and when the rotary power output shaft of the rotary power driving element 12 rotates, each position of each diaphragm 1 of the diaphragm assembly 11 can contact with the sewage to be treated, and therefore, the diaphragm assembly 11 can be more fully utilized.
Wherein, carousel formula bioreactor still includes overflow tank 47. A notch 46 is arranged on the upper edge of the lower shell 5, a spillway groove 47 is externally hung on the lower shell 5, and a receiving opening of the spillway groove 47 corresponds to the notch 46. In this case, if the lower housing 5 of the rotary disk type bioreactor according to the embodiment of the present invention contains a large amount of wastewater to be treated and exceeds the lowest position of the notch 46, the overflowed water can flow into the overflow tank 47 from the notch 46, that is, by observing the overflow tank 47, it can be easily known whether the water injected into the lower housing 5 reaches the critical position.
Wherein the overflow groove 47 includes a slope plate 48 and two side plates 49. The slope plate 48 is fixedly attached to the outer sides of the two side plates 49 so that the bottom surface of the overflow groove 47 forms a seal. When the sewage to be treated in the lower housing 5 exceeds the lowest position of the notch 46, the sewage overflows from the notch 46, and when the sewage starts to overflow, the flow rate is large, so that the overflow distance is long, and the flow rate is reduced along with the gradual overflow of the water, so that the two side plates 49 can be designed to have a shape with a large upper opening and a small lower opening. In this embodiment, both the side plates 49 are right triangles, one of the right corners of the right triangles is fixedly connected to the outer wall of the lower case 5, and the inclined plate 48 is fixedly connected to the hypotenuse of the right triangles, in which case, the bottom of the inclined plate 48 is fixedly connected to the outer wall of the lower case 5, and the overflow groove 47 is formed between the outer wall of the lower case 5, the two side plates 49 and the inclined plate 48.
Wherein, carousel formula bioreactor still includes the sealing washer. The sealing ring is arranged between the corresponding connecting surfaces of the upper shell 4 and the lower shell 5, so that sealing is formed between the corresponding connecting surfaces of the upper shell 4 and the lower shell 5. Under this condition, can avoid pending sewage to spill over between the corresponding connection face of upper housing 4 and lower housing 5, cause the outer wall of lower housing 5 dirty, secondary pollution even. In this embodiment, the bottom surface edge outside of last casing 4, the top surface edge outside of casing 5 all is provided with the extension limit, the corresponding position on this extension limit is provided with the bolt hole, through fastening bolt, fix these two extensions together, can reach the fixed between last casing 4 and the casing 5 down, the sealing washer presss from both sides and fills in between these two extension limits, for example, the material of sealing washer can be rubber, under this condition, utilize the pressurized deformation that rubber self has and have certain shape and resume the trend, can make the connection formation between last casing 4 and the casing 5 down sealed.
Wherein, diaphragm subassembly 11 includes a plurality of diaphragm units 52, and a plurality of diaphragm units 52 are established ties each other, and diaphragm unit 52 includes a plurality of fan-shaped diaphragms 1, and diaphragm subassembly 11 still includes the series connection subassembly, and the series connection subassembly includes dabber 50. The plurality of fan-shaped diaphragms 1 are fixedly connected to the mandrel 50 through the smaller diameter ends thereof, so that the larger diameter ends of the diaphragm units 52 are in a common circle. In the present embodiment, the central angle of the fan-shaped diaphragm 1 is 60 °, that is, each diaphragm unit 52 is composed of 6 diaphragms 1.
Wherein, carousel formula bioreactor still includes series module still includes diaphragm bracing piece 2. The diaphragm 1 is provided with supporting through holes, the number of the diaphragm supporting rods 2 corresponds to the number of the supporting through holes, and the diaphragm supporting rods 2 are fixedly arranged in the supporting through holes in a penetrating mode. In this case, the diaphragm units 52 are supported by the diaphragm support rods 2 in the axial direction, so as to ensure that the distance between the diaphragm units 52 of the diaphragm assembly 11 applied to the carousel-type bioreactor provided in the embodiment of the present invention is constant.
Wherein, a damping piece is arranged between the supporting through hole and the diaphragm supporting rod 2. This damping piece can increase the frictional resistance between diaphragm bracing piece 2 and the diaphragm 1 to guarantee the stability of being connected between diaphragm 1 and the diaphragm bracing piece 2. In this embodiment, the damping member may be formed of a spacer made of rubber.
Each of the membranes 1 constituting the membrane unit 52 is formed in a net shape. In this case, since each membrane 1 constituting the membrane unit 52 is formed in a net shape, a large specific surface area can be provided, and thus more biological membranes can be suspended, that is, in this case, the rotating disc type biological reaction apparatus provided by the embodiment of the present invention can have a better efficiency of treating the sewage to be treated.
Each of the membranes 1 constituting the membrane unit 52 is made of polyvinylidene chloride. Polyvinylidene chloride (PVDC) is abbreviated, homopolymers and copolymers of vinylidene chloride are conventionally known as saran resins, and commercial polymers are copolymers of vinylidene chloride (VDC) with vinyl chloride, acrylates or acrylonitrile. The choice of the comonomer greatly affects the properties of the copolymer, and the form of the copolymer is determined by the processing method such as melt processing, solution coating, dispersion coating, and the like.
Wherein, the aeration device 18 comprises an air inlet pipe 28, aeration pipes 29 and 31 and a bracket 30. One end of the air inlet pipe 28 is used for connecting a blower, the other end of the air inlet pipe 28 is connected to the aeration pipes 29 and 31, the aeration pipes 29 and 31 are erected on the support 30, a plurality of through holes 34 are formed in the pipe walls of the aeration pipes 29 and 31, and the air inlet pipe 28 and the aeration pipes 29 and 31 are communicated with each other and are communicated with the accommodating space through the through holes 34. In this embodiment, the length of the aeration pipes 29 and 31 is greater than the axial length of the membrane module 11, that is, the membrane module 11 can be fully covered by the aeration pipes 29 and 31 in the axial direction, and the aeration pipes 29 and 31 are located at the bottom of the lower housing 5, that is, the membrane module 11 attached with the bacillus microorganisms can be timely purged by the gas flowing out from the through hole 34 in real time when the sewage to be treated is treated, so that the thickening effect of the biofilm on the membrane module 11 is remarkably avoided.
Wherein, the bottom of the side wall of the housing 51 is provided with a sewage hole 10, and the accommodating space is communicated with the outside through the sewage hole 10. In this case, the filth that cannot be effectively treated can be efficiently discharged from the soil discharge hole 10.
In the rotating disc type biological reaction apparatus provided by the embodiment of the present invention, the rotary power driving element 12 is a speed reducer, and is fixedly connected to the housing 6 through the supporting mechanism 13 and the second supporting mechanism 16. Wherein, the supporting mechanism 13 comprises a first supporting plate 35, a first reinforcing rib 36, a second reinforcing rib 37 and a buffer sleeve 38, the second supporting mechanism 16 comprises a second supporting plate not numbered in the figure and two engaging lugs 60, the two engaging lugs 60 are fixedly connected to the upper surface not numbered in the figure of the second supporting plate, wherein, the first supporting plate 35 is fixedly connected to the outer wall of the lower shell 5, the first reinforcing rib 36 is fixedly connected between the outer walls of the first supporting plate 35 and the lower shell 5, and plays a role of longitudinal support for the first supporting plate 35, the second reinforcing rib 37 is fixedly connected to the lower part of the first supporting plate 35, and plays a role of transverse support for the first supporting plate 35, the buffer sleeve 38 is arranged at the bottom of the first reinforcing rib 36 and the second reinforcing rib 37, and is fixedly connected to the bottom of the first reinforcing rib 36 and the second reinforcing rib 37, the axial center of the buffer sleeve 38 is provided with a through hole 39, a buffer washer 40 is fixedly sleeved on the buffer pin 14 in the circumferential direction, the buffer pin 14 penetrates through the through holes formed in the two connecting lugs and the buffer sleeve 38, and the buffer washer 40 is arranged between the inner wall of the buffer sleeve 38 and the buffer pin 14. In general, the speed reducer generates vibration during the rotation of the output shaft, and in the case of the rotating disc type bioreactor provided by the embodiment of the present invention, the vibration generated during the rotation of the output shaft by the speed reducer can be attenuated by the cushion washer, so that the influence of the vibration of the speed reducer during the operation on the rotating disc type bioreactor provided by the embodiment of the present invention can be reduced. In this embodiment, in order to position the buffer pin 14 on the two connecting lugs 60, a positioning through hole 41 is further formed in the radial direction of the buffer pin 14, and the buffer pin can be prevented from coming off from the positioning through holes on the two connecting lugs 60 by a way of penetrating an opening pin therein; in addition, a protrusion is disposed at the other end of the buffer pin 14, the diameter of the protrusion is larger than the diameter of the through holes on the two engaging lugs, when the through holes are inserted into the through holes of the two engaging lugs 60 from the small end of the buffer pin 14, and then a cotter pin is inserted into the positioning through hole to position the buffer pin.
Wherein, the both sides of diaphragm 1 all are provided with diaphragm positioning disk 59, and this diaphragm positioning disk 59 sets up in the center department of diaphragm 1 along the axial, and after diaphragm unit 52 establishes ties, each diaphragm positioning disk 59 supports each other, because diaphragm positioning disk 59 itself has certain rigidity in the axial, consequently, can ensure that the interval between each diaphragm 1 is invariable, in the use, can make the utilization efficiency of diaphragm 1 more stable.
Referring to fig. 22, the operation method of the rotating disc type bioreactor according to the embodiment of the present invention includes the following steps:
step S1: the rotary power prime mover 12 is responsive to the activation control signal to cause activation of the rotary power output shaft;
step S2: the rotary power output shaft accelerates and rotates at a first set acceleration;
step S3: the first set acceleration is zero when the rotating power output shaft reaches the rated rotating speed;
step S4: the rotary power output shaft keeps constant running of the rotating speed at the rated rotating speed;
step S5: when the braking of the rotary power output shaft is required, the rotary power driving element 12 responds to the braking control signal, so that the rotary power output shaft rotates at a second set acceleration in a speed reduction mode;
step S6: when the braking of the rotary power output shaft is completed, the second set acceleration is zero.
The first set acceleration is larger than zero, and the second set acceleration is smaller than zero.
The operation method of the rotating disc type biological reaction device provided by the invention can enable the rotating power output shaft of the rotating power driving part 12 to reach the stable rated rotating speed in a slow speed increasing mode, and when the rotating power output shaft is required to brake, the rotating power output shaft can also be braked in a slow speed reducing mode, namely, under the condition of the rotating disc type biological reaction device provided by the invention, the diaphragm assembly 11 can reach the stable rated rotating speed in a slow speed increasing mode, and can be braked in a slow speed reducing mode after the rated rotating speed is operated for a set time, so that the energy-saving effect can be realized, the fatigue resistance of the rotating power driving part 12 in the starting or braking process can be avoided, and the service life of the rotating disc type biological reaction device provided by the invention is prolonged.
The first starting and braking method provided by the embodiment of the invention is as follows:
as shown in FIG. 23, the first rotary disk type bioreactor according to the present invention is operated for one period of time, and the rotating speed of the rotary power output shaft of the rotary power prime mover 12 is plotted against time, wherein the slope of the curve represents the acceleration of the rotating speed of the rotary power output shaft, and wherein during the start-up period, the acceleration a1＝10r/min2And in the braking phase, acceleration a2＝-10r/min2. In this case, canThe technical effects of slow starting and slow braking can be achieved.
The second starting and braking method provided by the embodiment of the invention is as follows:
as shown in FIG. 24, the second rotary disk type bioreactor according to the embodiment of the present invention is operated for one cycle time in a graph of the rotational speed of the rotary power take-off shaft of the rotary power prime mover 12 versus time, in which the slope of the graph represents the rotational speed acceleration of the rotary power take-off shaft, and in this case, the acceleration of the rotational speed of the rotary power take-off shaft is increased stepwise at the start of the start-up, for example, the stepwise-increased acceleration may be increased by 1r/min every 2min2At this time, it is equivalent to starting the warm-up, when the acceleration increases to a1＝10r/min2Then, the power output shaft is rotated at an acceleration a1＝10r/min2When the rotational speed of the rotary power output shaft is increased to n1Then, due to n1Has approached the rated speed n of the rotary power output shafteTherefore, the rotation speed of the rotary power output shaft is increased to n1Thereafter, the acceleration is gradually decreased, for example, the gradually decreased acceleration may be decreased by 1r/min every 2min2In this case, when the rotation speed reaches neIn time, the acceleration is also reduced to 0, and the effect of slow start can be achieved. That is, t is reached at time1When the rotating speed of the rotating power output shaft reaches neThereafter, the rotating disc type biological reaction device provided by the embodiment of the invention continuously and stably operates until the time t2Where, time can t2When the braking of the rotating power output shaft is required, the rotating disc type bioreactor provided by the embodiment of the invention starts braking, and in the same situation, the constant acceleration deceleration can be maintained at the beginning of braking, for example, the initial braking acceleration value can be increased step by step, but the rotating speed of the rotating power output shaft is decreased step by step because the braking acceleration is negative, for example, the gradually decreased acceleration can be decreased by 1r/min every 2min2This corresponds to a brake warm-up, when the acceleration increases to a2＝-10r/min2Rear, rotary power take-off shaftAt an acceleration a2＝-10r/min2When the rotational speed of the rotary power output shaft is reduced to n2Then, due to n2Has approached 0, and therefore the rotational speed at the rotary power take-off shaft is reduced to n2Thereafter, the acceleration is gradually decreased, for example, the gradually decreased acceleration may be decreased by 1r/min every 2min2In this case, when the rotation speed reaches 0, the acceleration is also reduced to 0, and the slow start effect is achieved. In this case, not only a slow down speed of the rotary power prime mover can be achieved. During the processes of starting initiation, starting middle, starting ending, braking initiation, braking middle and braking ending, the rotary power driving element can be further protected, so that the rotary power driving element is prevented from being burnt due to temporary overcurrent.
After the braking of the rotary power output shaft is completed in step S6, the method further includes the following steps:
step S7: and after the second set interval, the rotary power output shaft repeats the steps S1-S6.
Under the condition, the rotating disc type biological reaction device provided by the embodiment of the invention has the intermittent time, and the possibility of burning due to overhigh temperature of the motor under the condition of continuous operation can be avoided, so the service life of the rotating disc type biological reaction device provided by the embodiment of the invention can be further prolonged.
After the second set time interval, in the process that the rotary power output shaft repeats the steps, the re-rotation direction of the rotary power output shaft is the same as or opposite to the previous rotation direction. Under the condition, the fatigue damage caused by the unidirectional rotation of the rotary power driving piece can be reduced by adjusting the rotation direction of the rotary power driving piece, so that the service life of the rotating disc type biological reaction device provided by the embodiment of the invention is further prolonged.
Referring to fig. 25 to 26, in the municipal sewage treatment system according to the embodiment of the invention, the housing 51 is replaced by the upper housing 4 and the tank 5 ', wherein the upper housing 4 is fixedly connected to the tank 5 ', and an accommodating space is formed inside the upper housing 4 and the tank 5 '. At this time, the diaphragmThe assembly 11 is connected to the upper housing 4 through the main drive shaft 22 and the sub drive shaft 20 such that the diaphragm assembly 11 is received in the receiving space. Referring to FIG. 27, in this case, two adjacent sets of bioreactor processing tanks can be used in conjunction with adjacent tank walls to expand the capacity at a lower construction cost. In this embodiment, the formed biological reaction treatment tank may be constructed separately or may be composed of A2The anoxic tank of the O treatment process is obtained by modifying, namely the biological reaction device and the upper shell are arranged on the A2The upper part of the anoxic tank of the O process can better utilize the anoxic tank of the existing A2O treatment process, and the urban sewage treatment system provided by the embodiment of the invention has lower construction cost.
Embodiment of urban sewage treatment method
Examples 1 to 10
TABLE 1
TABLE 1
Therefore, after the municipal sewage treatment system and the treatment method provided by the invention are used for treating the municipal sewage, COD, TN and NH4+The three indexes-N all meet the primary A standard in the pollutant discharge Standard of municipal wastewater treatment plant (GB18918-2002), wherein the primary A standard in the standard requires that the highest allowable discharge concentration (daily average value) of the basic control items is COD (chemical oxygen demand): 50 mg/L (total nitrogen, calculated by N): 15 mg/L4+N (ammonia nitrogen (calculated by N)): 5(8) mg/L, and the system has good and stable effect.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (20)
1. A municipal sewage treatment system, comprising:
a mixing pool: nutrient solution and carbon source are added in the sewage treatment device for mixing the sewage to be treated from upstream, the nutrient solution and the carbon source;
the biological reaction device comprises: a bacillus microbial film is arranged at the downstream of the mixing tank and attached to a carrier of the biological reaction device, and the bacillus microbial film is used for preliminarily removing COD and NH in the sewage to be treated aiming at the effluent from the mixing tank4 +-N and TN;
an aeration tank: arranged at the downstream of the biological reaction device, a flora taking bacillus microorganisms as dominant bacteria is added into the aeration tank, and the flora is used for removing the sewage to be treated and carrying out nitration treatment, so that the residual COD and NH in the sewage are treated4 +-N and TN are removed;
an aeration mechanism: and a carrier for providing the required dissolved oxygen amount for the aeration tank and purging the biological reaction device.
2. The municipal sewage treatment system according to claim 1, further comprising:
solid waste filtering device: the device is used for filtering solid waste in the sewage to be treated;
a grit chamber: a settling device disposed downstream of the solid waste filtering device, for settling a sediment in the effluent passing through the solid waste filtering device;
an anaerobic tank: the mixing tank is arranged at the upstream of the mixing tank and is used for mixing the effluent from the sand basin;
a secondary sedimentation tank: the device is arranged at the downstream of the aeration tank and is used for carrying out sludge-water separation on the effluent from the aeration tank;
a post-processing system: and the downstream of the secondary sedimentation tank is used for carrying out post-treatment on the effluent from the secondary sedimentation tank so as to ensure that the obtained effluent meets the discharge standard.
3. The municipal sewage treatment system according to claim 2, wherein said solid waste filtration device comprises:
a coarse grid treatment tank: a coarse grating is arranged in the sewage treatment device and is used for filtering solid wastes with the specification larger than meshes of the coarse grating in the sewage to be treated;
a fine grid treatment tank: the inside is provided with fine grid, set up in the low reaches of thick grid, is used for the filtering the specification is greater than in the sewage of treating the fine grid mesh, but is less than the solid waste of thick grid mesh.
4. The municipal sewage treatment system according to claim 3, further comprising:
a coarse grid lifting pool: the coarse grid lifting pool is communicated with the coarse grid through meshes of the coarse grid;
a lift pump: and the lifting device is used for lifting the sewage to be treated in the coarse grating lifting tank to the fine grating treatment tank.
5. The municipal sewage treatment system according to claim 1, further comprising:
nutrient solution feeding device: for adding a nutrient solution to the mixing tank, the nutrient solution being utilizable by the microorganism of the genus bacillus;
a carbon source adding device: and the carbon source is used for adding a carbon source into the mixing tank, and the carbon source can be utilized by microorganisms in the sewage to be treated.
6. The municipal sewage treatment system according to claim 1, wherein the aeration tank is in communication with the mixing tank such that the digestion liquid obtained after treatment in the aeration tank is returned to the mixing tank,
wherein the content of the first and second substances,
the return of the sewage to be treated is realized by a nitrifying liquid return pump;
the reflux quantity of the nitrifying liquid is 0-8 times of the designed water quantity.
7. The municipal sewage treatment system according to claim 1, wherein the secondary sedimentation tank is in communication with the anaerobic tank so that a portion of the sludge obtained after treatment in the secondary sedimentation tank can be returned to the mixing tank,
wherein the content of the first and second substances,
the reflux of the partial sludge is realized by a sludge reflux pump;
the return flow of the partial sludge is 0-4 times of the designed water amount.
8. The municipal sewage treatment system according to claim 1, further comprising:
a sludge treatment system: used for treating the sludge in the secondary sedimentation tank.
9. The municipal sewage treatment system according to claim 1, wherein said post-treatment system comprises:
a coagulating sedimentation tank: the system is arranged at the downstream of the secondary sedimentation tank and is used for flocculating and settling the effluent from the secondary sedimentation tank;
a filter tank: the system is arranged at the downstream of the coagulating sedimentation tank and is used for filtering the effluent from the coagulating sedimentation tank;
a disinfection tank: and the water outlet pipe is arranged at the downstream of the filter tank and used for disinfecting the water outlet from the filter tank, and the water outlet treated by the disinfection tank meets the discharge standard.
10. The municipal sewage treatment system according to claim 1, wherein said bacillus microorganism is selected from the group consisting of bacillus subtilis, bacillus anthracis, bacillus cereus, bacillus thuringiensis, bacillus licheniformis, bacillus caustic, bacillus sphaericus, bacillus polymyxa, bacillus macerans and the like, and the original loading of said bacillus microorganism is in the range of 100DCU/500m3-500DCU/500m3。
11. The municipal sewage treatment system according to claim 1, wherein the ratio of the amount of said nutrient solution to the volume of the sewage to be treated entering said mixing tank is in the range of (1: 100000) - (1: 200000); the value range of the adding volume of the carbon source adding amount and the adding amount of the sewage to be treated entering the mixing tank is 1.1g/m3-2g/m3。
12. The municipal sewage treatment system according to claim 1, wherein the nutrient solution comprises the following components in parts by weight:
leucine: 3-8 parts; serine: 5-10 parts; aspartic acid: 3-10 parts; vitamin B6: 0.1 to 0.3 portion; magnesium: 0.1-0.3 parts, water: 21.4 to 35.8 portions.
13. The municipal sewage treatment system according to claim 1, wherein said carbon source is selected from the group consisting of glucose, methanol, and sodium acetate.
14. The municipal sewage treatment system according to claim 1, wherein the specific surface area of the portion of the carrier of the biological reaction device directly located in the sewage to be treated is 40% -45% of the total specific surface area of the carrier, and the rotational speed of the membrane module (11) is 3r/min-6 r/min.
15. The municipal sewage treatment system according to claim 1, wherein the dissolved oxygen content in said aeration tank ranges from 0.01 mg/L to 1.3 mg/L, and the retention time of the sewage to be treated in said aeration tank ranges from 12h to 20 h.
16. The municipal sewage treatment system according to claim 1, further comprising:
a stirring device: and the aeration tank is arranged in the aeration tank and is used for stirring the sewage to be treated in the aeration tank.
17. Municipal sewage treatment system according to claim 1, wherein the biological reaction means comprises a rotating disc type biological reaction means comprising a housing (51), a membrane assembly (11), a main drive shaft (22), a secondary drive shaft (20), a rotary power prime mover (12) and an aeration means (18),
the inside of the shell (51) is provided with an accommodating space, and the shell (51) is provided with a water inlet hole and a water outlet hole;
the main transmission shaft (22) is fixedly connected to one axial end of the diaphragm assembly (11), the auxiliary transmission shaft (20) is fixedly connected to the other axial end of the diaphragm assembly (11), and the diaphragm assembly (11) is arranged in the accommodating space through the main transmission shaft (22) and the auxiliary transmission shaft (20);
the rotary power output shaft of the rotary power driving element (12) is fixedly connected to the main transmission shaft (22);
the gas generated by the aeration device (18) can purge the membrane assembly (11);
the membrane component (11) is attached with a microorganism of the genus bacillus.
18. The municipal sewage treatment system according to claim 17, wherein said method of operating a carousel-type biological reaction unit comprises the steps of:
the rotary power prime mover (12) is responsive to an activation control signal to cause activation of the rotary power output shaft;
the rotary power output shaft accelerates and rotates at a first set acceleration;
the first set acceleration is zero when the rotating power output shaft reaches a rated rotating speed;
the rotary power output shaft keeps constant running of the rotating speed at the rated rotating speed;
when braking of the rotary power output shaft is required, the rotary power prime mover (12) responds to a braking control signal to enable the rotary power output shaft to rotate at a second set acceleration speed reduction;
when the braking of the rotary power output shaft is finished, the second set acceleration is zero;
wherein the first set acceleration is greater than zero and the second set acceleration is less than zero.
19. Municipal sewage treatment system according to claim 17, characterized in that the housing (51) is replaced by an upper housing (4) and a basin (5'), wherein,
the upper shell (4) is fixedly connected to the tank body (5 ') and forms the accommodating space inside the upper shell (4) and the tank body (5').
20. A municipal sewage treatment method which is realized based on the municipal sewage treatment system according to any one of claims 1 to 19.
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| CN202010300780.7A CN111470723A (en) | 2020-04-16 | 2020-04-16 | Urban sewage treatment system and treatment method |
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| CN202010300780.7A CN111470723A (en) | 2020-04-16 | 2020-04-16 | Urban sewage treatment system and treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117142630A (en) * | 2023-10-26 | 2023-12-01 | 北京华科仪科技股份有限公司 | Automatic control method and system of rotary disc type biological reaction device |
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