CN212451073U - Urban sewage treatment system - Google Patents
Urban sewage treatment system Download PDFInfo
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- CN212451073U CN212451073U CN202020924495.8U CN202020924495U CN212451073U CN 212451073 U CN212451073 U CN 212451073U CN 202020924495 U CN202020924495 U CN 202020924495U CN 212451073 U CN212451073 U CN 212451073U
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Abstract
The utility model discloses an urban sewage treatment system, include: the device comprises a pretreatment unit, a secondary biochemical unit and a depth treatment unit which are sequentially connected, wherein the pretreatment unit comprises a filtering device and a primary sedimentation device, the filtering device comprises a steel wire rope type coarse grating and a screen plate type stepped fine grating which are combined, and a gas negative pressure lifting device for pumping sand is arranged corresponding to the primary sedimentation device; the secondary biochemical unit comprises an anaerobic tank, an anoxic tank and an aerobic tank which are connected in sequence; a carbon source adding device is arranged corresponding to the anoxic tank, MBBR suspended filler is added into the aerobic tank, and a first chemical phosphorus removal adding device is arranged at the tail end of the aerobic tank; the advanced treatment unit comprises a micro flocculation tank and a fiber bundle filtering tank, and a second chemical phosphorus removal feeding device is arranged corresponding to the flocculation tank. Operation tests prove that the discharged water quality of the utility model can stably reach the first-level A water outlet standard of pollutant discharge Standard of urban Sewage treatment plant (GB 18918-2002).
Description
Technical Field
The utility model relates to a sewage treatment technical field especially relates to an urban sewage treatment system.
Background
With the rapid increase of urban population and the continuous development of industry and agriculture, the phenomena of water resource shortage and water pollution become more and more serious, and higher requirements are put forward on the effluent standard of urban sewage treatment plants, so that China has gradually promoted the first-class A effluent standard of the discharge standard of pollutants for urban sewage treatment plants (GB 18918-2002). However, at present, sewage plant treatment systems exist more
The actual problem that the removal effect of pollutants such as TN, TP and SS can not reach the standard stably is solved urgently by upgrading and transforming the existing sewage treatment system and further stably realizing the efficient removal of the pollutants.
In addition, the sewage pretreatment unit comprises processes of filtering, sedimentation, aeration and the like, and aims to effectively remove inorganic particle substances in the system, but most of the existing sewage pretreatment units have part of inorganic particles entering the biochemical treatment unit, so that the microbial activity is reduced, the effective tank capacity of the biochemical treatment unit is occupied, and the pollutant removal is extremely adversely affected, and therefore, the optimization of the pretreatment unit is also an important component part for upgrading and modifying the system.
Disclosure of Invention
To the defect that exists among the prior art, the utility model aims to provide a can stabilize the high-efficient municipal sewage treatment system who gets rid of the pollutant.
In order to achieve the above purpose, the utility model adopts the following technical scheme.
A municipal sewage treatment system comprising: the device comprises a pretreatment unit and a secondary biochemical unit which are connected in sequence, wherein the pretreatment unit comprises a filtering device and a primary sedimentation device, and the secondary biochemical unit comprises an anaerobic tank, an anoxic tank and an aerobic tank which are connected in sequence; the device is characterized in that the filtering device comprises a steel wire rope type coarse grating and a screen plate type stepped fine grating which are combined, and a gas negative pressure lifting device for pumping sand is arranged corresponding to the primary sedimentation device; a carbon source adding device is arranged corresponding to the anoxic tank, MBBR suspended filler is added into the aerobic tank, and a first chemical phosphorus removal adding device is arranged at the tail end of the aerobic tank; the water outlet end of the secondary biochemical unit is also connected with an advanced treatment unit, the advanced treatment unit comprises a micro flocculation tank and a fiber bundle filtering tank, and a second chemical phosphorus removal feeding device is arranged corresponding to the flocculation tank.
More preferably, the gas negative pressure lifting device is a gas-lift type sand pump.
More preferably, the carbon source adding apparatus comprises: the system comprises a diaphragm pump, a dosing tank and an electromagnetic flowmeter, wherein the water inlet end of the diaphragm pump is connected with the dosing tank through a pipeline, the water outlet end of the diaphragm pump is connected with the electromagnetic flowmeter through a pipeline, and the water outlet end of the electromagnetic flowmeter is paved with a pipeline to the water inlet end of an anoxic pond.
More preferably, an ultrasonic liquid level meter is further arranged in the dosing tank and used for detecting the liquid level of the dosing tank.
More preferably, the MBBR suspended filler is HDPE, and the effective biofilm area is 0.89 multiplied by 106～1.42×106m2In the meantime.
More preferably, a perforated aeration system and a water inlet and outlet intercepting screen are arranged in the aerobic tank.
More preferably, the feeding point of the second chemical phosphorus removal feeding device is positioned at the water inlet end of the micro flocculation tank.
More preferably, the first chemical phosphorus removal adding device and the second chemical phosphorus removal adding device are the same set of chemical phosphorus removal adding device, and liquid medicines are respectively added into the aerobic tank and the flocculation tank through two different pipelines.
More preferably, the chemical phosphorus removal feeding device comprises a liquid storage tank and a delivery pump, wherein a water inlet end of the delivery pump is connected with the liquid storage tank through a pipeline, and a water outlet end of the delivery pump is respectively paved to the bottoms of the aerobic tank and the flocculation tank through a branched pipeline.
More preferably, a lifting pump pool is arranged at the water inlet end of the flocculation pool, and the lifting pump pool is used for filtering the sewage discharged from the aerobic pool and then lifting the sewage into the flocculation pool; the fiber bundle filtering tank is provided with a backwashing system and a wastewater tank, and the wastewater tank is used for collecting backwashing wastewater and is connected with the lifting pump tank.
More preferably, a disinfection tank is connected with the water outlet end of the fiber bundle filtering tank.
The utility model has the advantages that:
the filtering device is changed from a rotary type coarse grid to a steel wire rope type coarse grid and from a rotary drum type fine grid to a screen plate type stepped fine grid, and the sand pumping mode is changed from submersible type sand suction to gas negative pressure lifting; a carbon source adding device, an MBBR suspended filler and a chemical phosphorus removal adding device are additionally arranged in the secondary biochemical unit; meanwhile, a third-level advanced processing unit is added; the method can ensure the effluent quality, especially the effective removal of nitrogen and phosphorus compounds, reduce the risk of a large amount of inorganic particles entering a biochemical unit, increase the microbial activity and the pool capacity of a biochemical pool, and provide a full-flow technical scheme for the upgrading and reconstruction of the municipal sewage treatment plant. Operation tests prove that the utility model provides an urban sewage treatment system, the discharged water quality of which can stably reach the first-level A effluent standard of pollutant discharge standard of urban sewage treatment plant (GB 18918-2002).
Drawings
Fig. 1 shows a block diagram of the municipal sewage treatment system provided by the present invention.
Fig. 2 is a schematic structural view of the municipal sewage treatment system provided by the utility model.
Description of reference numerals:
1: pretreatment unit, 2: secondary biochemical unit, 3: and a depth processing unit.
1-1: steel wire rope type coarse grid, 1-2: mesh plate type stepped fine grid, 1-3: air negative pressure hoisting device.
2-1: a carbon source adding device, 2-2: MBBR suspended filler, 2-3: a first chemical phosphorus removal feeding device; 2-4: anaerobic pool, 2-5: an anoxic tank and a 2-6 aerobic tank.
3-1: a micro flocculation tank, 3-2: fiber bundle filter, 3-3: a second chemical phosphorus removal adding device, 3-4: and (4) lifting the pump pool.
4: and (4) a disinfection tank.
Detailed Description
In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.
Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "at least" means one or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the present application, unless otherwise specified or limited, "above" or "below" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply an elevation which indicates a level of the first feature being higher than an elevation of the second feature. The first feature being "above", "below" and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or merely means that the first feature is at a lower level than the second feature.
The following description will be further made in conjunction with the accompanying drawings of the specification, so that the technical solution and the advantages of the present invention are clearer and clearer. The embodiments described below are exemplary and are intended to be illustrative of the present invention, but should not be construed as limiting the invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
As shown in fig. 1 and 2, a municipal sewage treatment system comprises: the device comprises three-level processing units which are sequentially connected, wherein the three-level processing units are a pretreatment unit 1, a secondary biochemical unit 2 and a depth processing unit 3 respectively, the pretreatment unit 1 comprises a filtering device and a primary sedimentation device, the filtering device comprises a steel wire rope type coarse grating 1-1 and a screen type stepped fine grating 1-2 which are combined, and a gas negative pressure lifting device 1-3 for pumping sand is arranged corresponding to the primary sedimentation device; the secondary biochemical unit 2 comprises an anaerobic tank 2-4, an anoxic tank 2-5 and an aerobic tank 2-6 which are connected in sequence, a carbon source adding device 2-1 is arranged corresponding to the anoxic tank 2-5, MBBR suspended filler 2-2 is added into the aerobic tank 2-6, and a first chemical phosphorus removal adding device 2-3 is arranged at the tail end of the aerobic tank 2-6; the advanced treatment unit 3 comprises a micro flocculation tank 3-1 and a fiber bundle filtering tank 3-2, and a second chemical phosphorus removal feeding device 3-3 is arranged corresponding to the flocculation tank 3-1.
Compared with the prior art, the municipal sewage treatment system that this embodiment provided, its thick grid device is changed into the thick grid of wire rope formula by the thick grid of rotation, plays the effect of filtering large-scale suspended solid better, reduces elevator pump jam and wearing and tearing. The fine grating device is changed into an inward-entering type pore plate fine grating from a rotary drum type fine grating, so that the slag separation and filtration effects of the grating are effectively improved, and fibrous floating objects are reduced from entering the biochemical tank.
In this embodiment, the gas negative pressure lifting device 1-3 is preferably an air-lift type sand pump. The air stripping sand pumping system of the air stripping type sand pumping machine mainly comprises an air blower, a sand extractor, a pipeline, an electromagnetic valve and the like, wherein an air source is provided by the air blower, pressure air of a sand blowing pipe and a sand extracting pipe is controlled by the electromagnetic valve, the pressure air is introduced into the sand extractor from top to bottom through the pipeline, so that sewage, sand and air form a low-density gas-liquid mixture, the low-density gas-liquid mixture is discharged from the sand-water lifting pipeline from bottom to top, the sand-water mixed liquid is lifted, and then the sand-water mixed liquid enters the sand-water separator for sand. Compared with the traditional submersible sand suction, the air-lift sand pump has the advantages that the structure is simple, the sand pumping efficiency is high, the sand removing effect is good, gravel is reduced to enter a biochemical system to block an aeration system, and the sand-lift sand pump is free of easily-worn parts, not easy to block and reliable in system.
Preferably, the carbon source adding device 2-1 comprises: the system comprises a diaphragm pump, a dosing tank and an electromagnetic flowmeter, wherein the water inlet end of the diaphragm pump is connected with the dosing tank through a pipeline, the water outlet end of the diaphragm pump is connected with the electromagnetic flowmeter through a pipeline, and the water outlet end of the electromagnetic flowmeter is paved with a pipeline to the water inlet end of an anoxic pond so as to realize accurate addition of a carbon source. Further, still be equipped with the ultrasonic wave level gauge in the medicine adding jar for detect medicine adding jar liquid level, so that judge the liquid medicine surplus in real time, be convenient for the operating personnel arranges carbon source purchase and augments the operation.
Preferably, the material of the MBBR suspended filler 2-2 is HDPE, and the effective biofilm area is 1.42 multiplied by 106m2And an auxiliary perforation aeration system is additionally arranged to promote filler fluidization and a water inlet and outlet interception screen mesh is arranged to prevent the filler from losing in the system. In other embodiments, the effective biofilm area of the MBBR suspension packing can be suitably adjusted as desired, e.g., at 0.89 x 106～1.42×106m2But is not limited to this embodiment.
Preferably, the first chemical phosphorus removal adding device 2-3 and the second chemical phosphorus removal adding device 3-3 are the same set of chemical phosphorus removal adding device, and liquid medicine is respectively added into the aerobic tank 2-6 and the flocculation tank 3-1 through two different pipelines. In this embodiment, the chemical phosphorus removal feeding device comprises a liquid storage tank and a delivery pump, wherein a water inlet end of the delivery pump is connected with the liquid storage tank through a pipeline, and a water outlet end of the delivery pump is respectively paved to the bottoms of the aerobic tank 2-6 and the flocculation tank 3-1 through a branched pipeline.
Preferably, a lifting pump pool 3-4 is further arranged at the water inlet end of the flocculation pool 3-1, and the lifting pump pool 3-4 is used for filtering the sewage discharged from the aerobic pool 2-6 and lifting the filtered sewage into the flocculation pool 3-1. Preferably, the fiber bundle filtering tank 3-2 is provided with a back washing system and a waste water tank, wherein the waste water tank is used for collecting back washing waste water and is connected with the lifting pump tank 3-4.
Further, a disinfection tank 4 is connected to the water outlet end of the fiber bundle filtering tank 3-2 so as to disinfect the purified water and provide the quality of the discharged water.
When the urban sewage treatment system is used for carrying out a sewage treatment experiment, the specific process is as follows: 1) the hydraulic retention time of the secondary biochemical unit 2 is anaerobic for 1.71h, anoxic for 1.71h and aerobic for 3.42h respectively, the sludge concentration is 3500mgL, the sludge reflux ratio is 100 percent, and the reflux ratio of the mixed liquor is 150 percent. 2) The dosage of the first and second chemical phosphorus removal feeding devices is 20% sodium acetate solution 10m3D, 4% aluminium sulphate solution 25m3And/d, sodium acetate is used for supplementing when the carbon source of the inlet water is insufficient so as to achieve the stable denitrification effect. 3) The flocculation time of the micro flocculation tank is 1 min; the fiber bundle filtering tank adopts a filtering mode of changing water level, the normal filtering speed is 15-17 m/h, and the forced filtering speed is 17-19 m/h.
After the above experiment treatment, the discharged water quality of the municipal sewage treatment system provided by the embodiment can stably reach the first grade A effluent standard of discharge Standard of pollutants for municipal Sewage treatment plants (GB 18918-2002).
It will be understood by those skilled in the art from the foregoing description of the structure and principles that the present invention is not limited to the specific embodiments described above, and that modifications and substitutions based on the known art are intended to fall within the scope of the invention, which is defined by the claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.
Claims (10)
1. A municipal sewage treatment system comprising: the device comprises a pretreatment unit and a secondary biochemical unit which are connected in sequence, wherein the pretreatment unit comprises a filtering device and a primary sedimentation device, and the secondary biochemical unit comprises an anaerobic tank, an anoxic tank and an aerobic tank which are connected in sequence; the device is characterized in that the filtering device comprises a steel wire rope type coarse grating and a screen plate type stepped fine grating which are combined, and a gas negative pressure lifting device for pumping sand is arranged corresponding to the primary sedimentation device; a carbon source adding device is arranged corresponding to the anoxic tank, MBBR suspended filler is added into the aerobic tank, and a first chemical phosphorus removal adding device is arranged at the tail end of the aerobic tank; the water outlet end of the secondary biochemical unit is also connected with an advanced treatment unit, the advanced treatment unit comprises a micro flocculation tank and a fiber bundle filtering tank, and a second chemical phosphorus removal feeding device is arranged corresponding to the flocculation tank.
2. The municipal sewage treatment system according to claim 1, wherein said negative pressure gas lift device is a gas lift type sand extractor.
3. The municipal sewage treatment system according to claim 1, wherein said carbon source adding means comprises: the system comprises a diaphragm pump, a dosing tank and an electromagnetic flowmeter, wherein the water inlet end of the diaphragm pump is connected with the dosing tank through a pipeline, the water outlet end of the diaphragm pump is connected with the electromagnetic flowmeter through a pipeline, and the water outlet end of the electromagnetic flowmeter is paved with a pipeline to the water inlet end of an anoxic pond.
4. The municipal sewage treatment system according to claim 1, wherein the MBBR suspended filler is HDPE and the effective biofilm area is 0.89 x 106～1.42×106m2In the meantime.
5. The municipal sewage treatment system according to claim 1, wherein a perforated aeration system and a water inlet and outlet intercepting screen are provided in said aerobic tank.
6. The municipal sewage treatment system according to claim 1, wherein the dosing point of the second chemical phosphorus removal dosing apparatus is located at the water inlet end of the micro-flocculation tank.
7. The municipal sewage treatment system according to claim 1, wherein the first chemical phosphorus removal adding device and the second chemical phosphorus removal adding device are the same chemical phosphorus removal adding device, and the aerobic tank and the flocculation tank are respectively added with liquid medicine through two different pipelines.
8. The municipal sewage treatment system according to claim 7, wherein the chemical phosphorus removal adding apparatus comprises a liquid storage tank and a delivery pump, wherein the water inlet end of the delivery pump is connected to the liquid storage tank through a pipeline, and the water outlet end of the delivery pump is respectively laid to the bottoms of the aerobic tank and the flocculation tank through a branched pipeline.
9. The municipal sewage treatment system according to claim 1, wherein a lift pump pond is provided at the water inlet end of the flocculation pond, and the lift pump pond filters the sewage discharged from the aerobic pond and lifts the filtered sewage into the flocculation pond; the fiber bundle filtering tank is provided with a backwashing system and a wastewater tank, and the wastewater tank is used for collecting backwashing wastewater and is connected with the lifting pump tank.
10. The municipal sewage treatment system according to claim 1, wherein a disinfection tank is connected to the outlet end of said fiber bundle filtration tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020924495.8U CN212451073U (en) | 2020-05-27 | 2020-05-27 | Urban sewage treatment system |
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| CN202020924495.8U CN212451073U (en) | 2020-05-27 | 2020-05-27 | Urban sewage treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114590959A (en) * | 2022-03-01 | 2022-06-07 | 贵州高投生态产业有限公司 | ECOF four-micro-physical sewage treatment system, treatment process and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114590959A (en) * | 2022-03-01 | 2022-06-07 | 贵州高投生态产业有限公司 | ECOF four-micro-physical sewage treatment system, treatment process and application |
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