CN213596116U - Steel structure magnetic coagulation clarification tank combined system with water outlet index reaching surface IV - Google Patents
Steel structure magnetic coagulation clarification tank combined system with water outlet index reaching surface IV Download PDFInfo
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- CN213596116U CN213596116U CN202022533101.9U CN202022533101U CN213596116U CN 213596116 U CN213596116 U CN 213596116U CN 202022533101 U CN202022533101 U CN 202022533101U CN 213596116 U CN213596116 U CN 213596116U
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Abstract
The utility model discloses a go out water index and reach IV steel construction magnetic coagulation clarification tank combined system in earth's surface, include: the system comprises a coarse grid and a lift pump house, wherein urban sewage is connected with the coarse grid and the lift pump house through a main water inlet pipe; then the sewage enters a filtering and sand setting module for filtering and sand setting; then enters a magnetic coagulation clarification tank modulePerforming flocculation and precipitation; the primary aeration biological filter module utilizes microorganisms in the biological membrane to decompose COD, BOD and NH in the sewage3-N; carrying out nitration reaction in a secondary biological aerated filter module; meanwhile, the magnetic coagulation clarification tank with a steel structure is adopted, so that no dead angle is formed at the bottom of the tank, and sludge and impurities are not easy to deposit; the strength is high, the deformation resistance is strong, the construction is simple, and the cost is low; and 20-30% of the effluent of the secondary biological aerated filter flows back to the magnetic coagulation clarification tank for further purification treatment; the system can efficiently decontaminate low-concentration town sewage and treat the low-concentration town sewage to reach the IV-class water standard on the earth surface.
Description
Technical Field
The utility model relates to a town sewage treatment technical field especially relates to a go out water index and reach surperficial IV's steel construction magnetic coagulation clarification tank combined system.
Background
In recent years, the economy of China is rapidly developed, the pollution is more and more serious, and the problems of economic development and ecological environment protection are faced. Therefore, aiming at the problem of water pollution, the treatment intensity is increased unprecedentedly, the standard is improved again and again, and the surface IV type water is executed for the effluent of urban sewage treatment.
At present, the general worsening trend of the environmental conditions in China is not completely restrained, the environmental contradiction is prominent, and the pressure is continuously increased. Some key drainage basins and sea areas have serious water pollution, partial areas and cities have prominent atmospheric haze phenomena, and the discharge amount of main pollutants in many areas exceeds the environmental capacity. The pollution of the rural environment is aggravated, and the pollution of heavy metal, chemicals, persistent organic pollutants, soil, underground water and the like appears. The ecological damage in partial areas is serious, the function of an ecological system is degraded, and the ecological environment is fragile. The nuclear and radiation safety risks increase. The environmental appeal of people is continuously improved, the number of emergent environmental events is high, and the environmental problem becomes one of the important factors threatening human health, public safety and social stability. The pressure on global environmental issues such as biodiversity protection is increasing. The environmental protection law is still imperfect, the investment is still insufficient, the law enforcement force is weak, and the supervision capability is relatively lagged. Meanwhile, with the continuous increase of the population, the rapid promotion of industrialization and urbanization, the total energy consumption is continuously increased, the pollutant generation amount is continuously increased, and the environmental constraint of economic growth is gradually strengthened. Sewage is characterized by its physical, chemical and biological components. The design of sewage treatment plants requires that the quality of sewage must be accurately controlled, and the composition of sewage is extremely complex, so that the property of sewage cannot be expressed by a single index. Therefore, in various water quality indexes, the sewage is divided into two categories of suspended substances and dissolved substances according to the shape and size of impurities in the sewage, and each category can be divided into organic substances and inorganic substances according to the chemical properties of the substances; depending on whether the dissolved oxygen in the water is consumed, the water can also be classified into Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and the like. In the design of sewage treatment systems, the quality of sewage is a necessary condition for determining the capacity and operational characteristics of treatment equipment and ensuring that treatment objectives are met, and is also important basic data for planning, designing and operating management of sewage treatment plants. The content of pollutants in municipal sewage is related to water consumption, drainage systems, climate, lifestyle and the like.
At present, the main process of town sewage treatment is an activated sludge method, which typically comprises: CASS process, AAO process, SBR process, MBR process and the like, the treatment effects of the processes are stable, but the process flow is long, the occupied area is large, the investment is large, and meanwhile, for low influent water concentration, namely COD is less than 180mg/L, BOD is less than 60, NH3-N: 20-25mg/L, TP: 2-5 mg/L; low treatment efficiency, high running cost and NH3the-N and the TP are difficult to reach the emission standard and the like.
In a specific treatment system, the magnetic coagulation clarification tank is used as a sewage treatment process for efficiently removing phosphorus and SS, has high water quality and water volume impact resistance load, good treatment effect, low comprehensive operation cost and small occupied area, and is widely used for pretreatment and advanced treatment of urban sewage treatment plants. At present, the magnetic coagulation clarification tank is mostly made of reinforced concrete, the internal structure of the magnetic coagulation clarification tank is complex, the sedimentation tank is circular, the reinforced concrete needs to be built into a square tank, then the internal chamfer forms a circular tank bottom, dead corners exist, the construction difficulty is high, the cost is high, the period is long, and the construction cost and the construction period control are not facilitated. So that the magnetic coagulation clarification tank in the form of a steel structure is very necessary.
SUMMERY OF THE UTILITY MODEL
Aiming at the existing technologies such as: the town sewage is in COD less than 180mg/L, BOD less than 60 and NH3-N: 20-25mg/L, TP: in the concentration range of 2-5mg/L, the prior art can not treat the urban sewage efficiently and at low cost because the prior art mainly aims at the conventional urban sewage with concentrationThe arranged process can purify the town sewage with low concentration pollution, but has relatively low treatment efficiency and high natural running cost, and simultaneously aims at NH3N and TP are difficult to purify completely; therefore, the objective condition of the difference of the urban sewage concentration should be considered, the process is suitable for treating the sewage with different concentrations, the standard of sewage treatment can be achieved, the cost can be reduced to the maximum extent, and the material utilization rate is improved.
The steel structure has the advantages of high strength, light dead weight, strong deformation resistance, simple construction, low cost and the like, and the circular sedimentation tank in the magnetic coagulation clarification tank has small span and uniform stress, and the quick mixing tank, the magnetic mixing tank and the flocculation tank have small size and shallow water depth and have the condition of being made into the steel structure, so the structural form of the magnetic coagulation clarification tank can consider replacing reinforced concrete with the steel structure.
The steel structure magnetic coagulation clarification tank combined system is characterized in that the effluent index reaches the earth surface IV, and the treatment is carried out through the following treatment modules which are sequentially communicated by fluid, wherein the treatment modules comprise a coarse grid and a lifting pump room, a fine grid and an air stripping grit chamber, a steel structure magnetic coagulation clarification tank, a fine grid and a secondary lifting pump station, a primary aeration biological filter tank and a secondary aeration biological filter tank;
the tank bottom of the steel structure magnetic coagulation clarification tank is provided with a reinforced concrete bottom plate, the steel structure bottom plate is embedded in the reinforced concrete bottom plate, and the steel structure bottom plate and the steel structure tank wall are enclosed to form a cylindrical structure; and an anti-corrosion structure layer is coated on the wall of the steel structure pool.
Preferably, the magnetic coagulation clarification tank comprises a rapid mixing tank, a magnetic mixing tank, a flocculation tank and a sedimentation tank which are arranged in sequence; PAC is added into the rapid mixing tank, magnetic powder is added into the magnetic mixing tank, PAM is added into the flocculation tank, the sedimentation tank is used for settling sludge, a water inlet pipe of the rapid mixing tank is connected with the air stripping grit chamber, and a water inlet pipe of the rapid mixing tank is also connected with a water outlet pipe of the secondary biological aerated filter; the effluent of the secondary biological aerated filter flows back to the quick mixing tank by 20-30 percent; and leading the sewage into a fine grid and a secondary lifting pump station through the sedimentation tank.
Preferably, the rapid mixing tank, the magnetic mixing tank and the flocculation tank are box-shaped steel structures communicated with each other through fluid, the side walls of the rapid mixing tank and the flocculation tank are arranged in a manner of being tightly attached to the sedimentation tank, and the magnetic mixing tank is positioned on one side of the rapid mixing tank, which is far away from the sedimentation tank; the sedimentation tank is of a cylindrical steel structure.
Preferably, the lifting pump room comprises a grating dirt separator and a coupling type centrifugal pump which are dragged by a steel wire rope; the coupling type centrifugal pump is used for lifting a water head.
Preferably, the fine grid is a 3mm internal inflow screen plate grid cleaner; the bottom of the air stripping grit chamber comprises a grit hopper for taking out sand grains in the sewage.
Preferably, the primary biological aerated filter is filled with a first filter material layer, and the first filter material layer is used for forming a biological membrane; the retention time of the sewage is 20-30 min; a filter plate is arranged below the first filter material layer, and a long-handle filter head is arranged on the filter plate; and the primary biological aerated filter module is also connected with a back flush water pipe.
Preferably, the secondary biological aerated filter is filled with a second filter material layer.
Preferably, a fine grid with the grid spacing of 1mm is further arranged between the magnetic coagulation clarification tank and the primary biological aerated filter.
Preferably, the water inlet mode of the first-stage biological aerated filter and the second-stage biological aerated filter is upward flow, and the water and the air are in the same direction.
The utility model has the advantages that: the utility model provides a go out water index and reach IV steel construction magnetic coagulation clarification tank combined system in earth's surface, handle through the processing module that connects gradually below, include: the system comprises a coarse grid and a lift pump house, wherein urban sewage is connected with the coarse grid and the lift pump house through a main water inlet pipe; then filtering and settling sand, and performing flocculation precipitation through a magnetic coagulation clarification tank; the microorganisms of the first-stage biological aerated filter are used for decomposing COD, BOD and NH in the sewage3-N; nitrosation of second-stage aeration biological filter and NH in nitrifying bacteria utilization sewage3-N is subjected to a nitration reaction; simultaneously of steel constructionThe magnetic coagulation clarification tank can realize no dead angle at the bottom of the tank and is not easy to deposit sludge impurities; the strength is high, the dead weight is light, the deformation resistance is strong, the construction is simple, and the cost is low; and 20-30% of the effluent of the secondary biological aerated filter flows back to the magnetic coagulation clarification tank for further purification treatment; the system can efficiently decontaminate low-concentration town sewage and can treat COD (chemical oxygen demand) and BOD (biochemical oxygen demand) in the low-concentration town sewage5、NH3N, TP treatment meets the surface class IV water standard.
Drawings
FIG. 1 is a system architecture diagram of the present invention;
FIG. 2 is a top view of the first-stage biological aerated filter and the second-stage biological aerated filter of the present invention;
FIG. 3 is a sectional view of the first-stage biological aerated filter and the second-stage biological aerated filter of the utility model;
FIG. 4 is a top view of the steel-structured magnetic coagulation clarification tank of the present invention;
FIG. 5 is a sectional view of the steel-structured magnetic coagulation clarification tank of the present invention;
fig. 6 is a perspective view of the steel-structured magnetic coagulation clarification tank of the utility model.
Description of the figures
1. A first-stage aeration biological filter; 11. backwashing the water pipe; 111. backwashing the blower; 12. a first filter material layer; 121. filtering the plate; 122. a long-handled filter head; 2. a second-stage biological aerated filter; 21. a water inlet pipe of the secondary biological aerated filter; 22. a second filter material layer; 3. an aeration pipe; 31. an aeration blower; 4. a magnetic coagulation clarification tank; 41. a fast mixing tank; 42. a magnetic mixing pool; 43. a flocculation tank; 44. a sedimentation tank.
Detailed Description
In order to make the present invention clearer, the present invention will be further described with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "suspended", and the like do not imply that the components are required to be absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Please refer to fig. 1, for the system architecture diagram of the present invention, specifically a steel structure magnetic coagulation clarification tank combination system with effluent index reaching surface iv, which is processed by the following processing modules in fluid communication in sequence, including a coarse grid and a lift pump house, a fine grid and an air-lift grit chamber, a magnetic coagulation clarification tank 4, a fine grid and a secondary lift pump station, a primary aeration biological filter, a secondary aeration biological filter, a steel structure magnetic coagulation clarification tank, the bottom of which is provided with a reinforced concrete bottom plate, a steel structure bottom plate is embedded in the reinforced concrete bottom plate, and the steel structure bottom plate and the steel structure tank wall enclose a cylindrical structure; and an anti-corrosion structure layer is coated on the wall of the steel structure pool.
In the embodiment, the coarse grating intercepts large garbage and suspended matters with the size of more than 20mm in the sewage; the sewage is lifted by the lifting pump room through a centrifugal pump to increase gravitational potential energy, and then the sewage is subjected to a fine grid to remove small garbage, suspended matters, hair fiber yarns, braided fabrics and other filamentous garbage with the size larger than 3mm in the sewage; then the sand grains in the sewage are removed by a sand settling hopper in the air stripping sand settling. The lift pump house is used for improving the water level of sewage and ensuring that the sewage treated subsequently can flow through the whole sewage treatment process through a self water head so as to purify the sewage; the grid sewage remover can be selected from a steel wire traction grid sewage remover, so that the water head is improved, and impurities with large volume in the sewage are removed; and the water head is improved by using the coupling type centrifugal pump.
The sewage treated by the air stripping grit chamber enters a magnetic coagulation clarification tank, and the magnetic coagulation clarification tank comprises a fast mixing tank 41, a magnetic mixing tank 42, a flocculation tank 43 and a sedimentation tank 44 which are arranged in sequence; PAC is added into the quick mixing tank, magnetic powder is added into the magnetic mixing tank, PAM is added into the flocculation tank, and the sedimentation tank is used for settling sludge; PAC is used for compressing double electric layers of the PAC or hydrolysate thereof, neutralizing the electricity, carrying out tape winding and netting, adsorbing and bridging and the like, and settling and filtering out particulate matters which can cause COD by oxidation of an oxidant, thereby reducing COD pollutants; the precipitation of particulate matter, which undoubtedly reduces SS, is referred to as BOD, which is the amount of oxygen required for the decomposition of organic matter in water by aerobic microorganisms, which reflects the amount of biodegradable organic matter in water under aerobic conditions, and which is reduced if said organic matter is removed by precipitation. The PAC is mechanically stirred to react with orthophosphate in the sewage to form precipitate, and the precipitate is combined with suspended matters in the sewage to form micro floc; the rapid mixing tank is also connected with a flocculation tank, PAM is added into the flocculation tank for precipitation treatment, micro flocs are combined with the PAM to further form larger alum flocs, the alum flocs are precipitated after entering the sedimentation tank, and insoluble COD and most of TP are removed through precipitation; PAM is a high-molecular flocculant, and organic polymeric flocculants have a huge surface adsorption effect due to the formation of larger flocs among particles.
In a more specific embodiment, referring to fig. 4-6, the magnetic coagulation clarification tank 4 comprises a rapid mixing tank 41, a magnetic mixing tank 42, a flocculation tank 43 and a sedimentation tank 44 which are arranged in sequence; PAC is added into the quick mixing tank, magnetic powder is added into the magnetic mixing tank, PAM is added into the flocculation tank, and the adding amount of PAC is 50-120 mg/L; the dosage of PAM is 0.5-1.5mg/L, so that a good treatment effect can be achieved; the sedimentation tank is used for settling sludge, a water inlet pipe of the rapid mixing tank is connected with the air stripping grit chamber, and a water inlet pipe of the rapid mixing tank is also connected with a water outlet pipe of the secondary biological aerated filter; the effluent of the secondary biological aerated filter flows back to the quick mixing tank by 20-30 percent; the sewage is led into a fine grid and a secondary lifting pump station through a sedimentation tank. The rapid mixing tank, the magnetic mixing tank and the flocculation tank are box-shaped steel structures communicated with each other through fluid, the side walls of the rapid mixing tank and the flocculation tank are arranged in a manner of being attached to the sedimentation tank, and the magnetic mixing tank is positioned on one side of the rapid mixing tank, which is far away from the sedimentation tank; the sedimentation tank is of a cylindrical steel structure. The steel construction material of adoption is Q235A, and the gomphosis has the steel construction bottom plate in the reinforced concrete bottom plate, then encloses synthetic columniform sedimentation tank with steel construction pool wall, and steel construction pool wall thickness is 5-10mm, and the pool wall outside of pool and flocculation basin is mixed to the fast of square construction, magnetism is reinforced with the square steel, and the agitator in the flocculation basin is reinforced with "well" word shape groove steel, the stability when the bulk strength, the steadiness and the equipment operation of guarantee steel construction cell body. As a sewage treatment process for efficiently removing phosphorus and SS, the magnetic coagulation clarification tank has the advantages of high water quality and water quantity impact resistance load, good treatment effect, low comprehensive operation cost and small occupied area, and is widely used for pretreatment and advanced treatment of urban sewage treatment plants. At present, the magnetic coagulation clarification tank is mostly made of reinforced concrete, the internal structure of the magnetic coagulation clarification tank is complex, the sedimentation tank is circular, the reinforced concrete needs to be built into a square tank, then the internal chamfer forms a circular tank bottom, dead corners exist, the construction difficulty is high, the cost is high, the period is long, and the construction cost and the construction period control are not facilitated. The steel structure has the advantages of high strength, light dead weight, strong deformation resistance, simple construction, low cost and the like, and the circular sedimentation tank in the magnetic coagulation clarification tank has small span and even stress, and the quick mixing tank, the magnetic mixing tank and the flocculation tank have small size and shallow water depth, so the magnetic coagulation clarification tank with the steel structure can achieve good effect.
The sewage which passes through the magnetic coagulation clarification tank is further intercepted by a fine grid; the gap of the fine grid is 1 mm. And the effluent of the fine grid enters a secondary lifting pump station and then is lifted to a primary biological aerated filter pool to provide a required water head for a subsequent process treatment section. The lifting means used are likewise coupled centrifugal pumps.
Referring to fig. 2-3, referred to as C filter for short, the first-stage biological aerated filter module is filled with a first filter material layer 12, on which a biofilm containing mixed strains is naturally formed; the mixed bacterial layer decomposes COD, BOD and NH in the sewage through the aeration effect3-N; the retention time of the sewage is 20-30 min; thereby reducing the COD concentration to below 30mg/L, BOD5The concentration is reduced to below 6mg/L, NH3-N is reduced to about 10 mg/L; a filter plate 121 is arranged at the lower end of the first filter material layer 12, and a long-handle filter head 122 is arranged on the filter plate; and the first-stage aeration biological filter module is also connected with a back flush water pipe 11.
The second-stage aeration biological filter module is called N filter for short, is filled with a second filter material layer 22, then forms a dominant bacterial layer consisting of nitrobacteria and nitrosobacteria through natural generation and natural selection, and nitrosation in the biological membrane and NH in sewage are utilized by the nitrobacteria through aeration3N to effect nitration and further NH reduction3N, make the effluent NH3-N concentration lower than 1.5 mg/L. In the actual design, the height of the primary biological aerated filter is higher than that of the secondary biological aerated filter 2, and the other end of the back flushing water pipe is connected with the secondary biological aerated filter module and is used for feeding water through a water inlet pipe 21 of the secondary biological aerated filter; an aeration pipe 3 and a corresponding aeration blower 31, a back washing water pipe 11 and a corresponding back washing blower 111 are arranged between the two filter tanks.
Compared with the common activated sludge method, the biological aerated filter has the advantages of high organic load, small floor area (1/3 of the common activated sludge method), less investment (30 percent saved), no sludge expansion, high oxygen transmission efficiency, good effluent quality and the like; the aeration biological filter tank integrates biological oxidation and suspended solid interception, saves a subsequent sedimentation tank (a secondary sedimentation tank), and has the advantages of large volume load and hydraulic load, short hydraulic retention time, less required capital investment and good effluent quality: low operation energy consumption and low operation cost. Is very suitable for urban sewage with COD less than 180mg/L, BOD less than 60 and NH3-N: 20-25mg/L, TP: 2-5 mg/L.
In a specific embodiment, sewage in a county city in the south of the Yangtze river is treated by the above process, and a water sample before treatment is analyzed, wherein the total influent pollutant concentration (mg/L) is as follows: CODcr：160；BOD5：45；NH3-N: 20; TP: 3.5; and tested for contaminant concentration after each item, concentrations as given in table 1;
TABLE 1
In the utility model, 20-30% of the discharged water of the second-stage biological aerated filter flows back to the magnetic coagulation clarification tank, and the overall purification effect is obviously improved. It can be seen that in the treatment system of the utility model, the coarse grid and the lift pump house → the fine grid and the air-lift sand basin → the steel structure magnetic coagulation clarification tank → the fine grid and the second stage lift pump station → the biological aerated filter (C filter) → the biological aerated filter (N filter, 20-30% of the effluent flows back to the steel structure magnetic coagulation clarification tank); in the process, each process step corresponds to the efficient removal of pollutants, the adverse effect of mutual influence is avoided, and the pollutant removal can be efficiently carried out in each link, so that the COD (chemical oxygen demand) of the whole process flow is less than 180mg/L, BOD (biochemical oxygen demand) is less than 60 and NH (NH)3-N: 20-25mg/L, TP: the town sewage with the concentration range of 2-5mg/L has the best treatment effect, saves the cost and time of sewage treatment and simultaneously achieves high-standard water outlet.
The utility model has the advantages that:
1. the process flow in the utility model is less than 180mg/L for the pollutants COD, less than 60 BOD and NH3-N: 20-25mg/L, TP: 2-5mg/L of town sewage in a concentration range reaches high-efficiency treatment, and all units are closely matched to finally obtain the surface effluent standard meeting IV level;
2. the magnetic coagulation clarification tank adopts a steel structure form, the material is Q235A, the thickness of a steel plate of the tank body is 5-10mm, the magnetic coagulation clarification tank is spliced by adopting a welding process and is subjected to antiseptic treatment, and corresponding reinforcing measures are taken for each part according to different stresses;
3. the combined sewage treatment system combines a magnetic coagulation clarification tank, a two-stage aeration biological filter (a C filter-N filter) and a composite vertical flow artificial wetland, and each process unit is full of time and efficient. The magnetic coagulation clarification tank efficiently removes COD and BOD in sewage through physical and chemical effects5And TP, removing all the organisms in the sewage by the biological reaction in the biological aerated filter CDegraded COD, BOD5And part of NH3N, removing all NH capable of being nitrified by biological reaction in the N filter of the aeration biological filter3-N；
4. The combined sewage treatment process enables 20-30% of effluent of the N filter tank of the aeration biological filter tank to flow back to the front end of the magnetic coagulation clarification tank, further strengthens the dephosphorization effect, and simultaneously strengthens COD and NH3-removal of N.
The above disclosure is only for the specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.
Claims (9)
1. A steel structure magnetic coagulation clarification tank combined system with effluent indexes reaching a ground surface IV is characterized in that treatment is carried out through following treatment modules which are sequentially communicated by fluid, wherein the treatment modules comprise a coarse grid and lift pump house module, a fine grid and air stripping grit chamber module, a steel structure magnetic coagulation clarification tank module, a fine grid and second-stage lift pump station module, a first-stage aeration biological filter tank module and a second-stage aeration biological filter tank module;
the tank bottom of the steel structure magnetic coagulation clarification tank module is provided with a reinforced concrete bottom plate, the steel structure bottom plate is embedded in the reinforced concrete bottom plate, and the steel structure bottom plate and the steel structure tank wall are enclosed to form a cylindrical structure; and an anti-corrosion structure layer is coated on the wall of the steel structure pool.
2. The steel structure magnetic coagulation clarification tank combined system with the effluent index reaching the earth surface IV as claimed in claim 1, wherein the magnetic coagulation clarification tank module comprises a fast mixing tank, a magnetic mixing tank, a flocculation tank and a sedimentation tank which are arranged in sequence; the rapid mixing tank is used for adding PAC (polyaluminium chloride), the magnetic mixing tank is used for adding magnetic powder, the flocculation tank is used for adding PAM (polyacrylamide), the sedimentation tank is used for settling sludge, a water inlet pipe of the rapid mixing tank is connected with the air stripping grit chamber, and a water inlet pipe of the rapid mixing tank is also connected with a water outlet pipe of the secondary biological aerated filter; the effluent of the secondary biological aerated filter flows back to the quick mixing tank by 20-30 percent; and leading the sewage into a fine grid and a secondary lifting pump station through the sedimentation tank.
3. The steel structure magnetic coagulation clarification tank combined system with the effluent index reaching the ground surface IV as claimed in claim 2, characterized in that the rapid mixing tank, the magnetic mixing tank and the flocculation tank are box-shaped steel structures which are communicated with each other through fluid, the side walls of the rapid mixing tank and the flocculation tank are closely attached to the sedimentation tank, and the magnetic mixing tank is positioned on one side of the rapid mixing tank, which is far away from the sedimentation tank; the sedimentation tank is of a cylindrical steel structure.
4. The steel structure magnetic coagulation clarification tank combined system with the effluent index reaching the surface IV of the earth according to claim 1, wherein the coarse grating and lifting pump room module comprises a grating dirt remover and a coupling type centrifugal pump which are dragged by a steel wire rope; the coupling type centrifugal pump is used for lifting a water head.
5. The steel structure magnetic coagulation clarification tank combined system with the effluent index reaching the earth surface IV as claimed in claim 1, wherein the fine grid and air stripping grit chamber module comprises a fine grid and an air stripping grit unit, and the fine grid is a 3mm internal inflow mesh plate grid sewage remover; the bottom of the air stripping sand setting unit comprises a sand setting hopper used for taking out sand grains in the sewage.
6. The steel structure magnetic coagulation clarification tank combined system with the effluent index reaching the surface IV according to claim 1, characterized in that the primary biological aerated filter is filled with a first filter material layer, and the first filter material layer is used for forming a biological membrane; the retention time of the sewage is 20-30 min; a filter plate is arranged below the first filter material layer, and a long-handle filter head is arranged on the filter plate; and the primary biological aerated filter module is also connected with a back flush water pipe.
7. The steel structure magnetic coagulation clarification tank combined system with the effluent index reaching the surface IV is characterized in that the secondary biological aerated filter is filled with a second filter material layer.
8. The steel structure magnetic coagulation clarification tank combined system for the effluent index reaching the surface IV according to claim 1, characterized in that a fine grid with the grid spacing of 1mm is further arranged between the magnetic coagulation clarification tank and the primary biological aerated filter.
9. The steel structure magnetic coagulation clarification tank combined system with the effluent index reaching the surface IV as claimed in claim 1, wherein the water inlet modes of the primary aeration biological filter and the secondary aeration biological filter are upward flow and the water and the air are in the same direction.
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