CN111039397A - Municipal administration sewage treatment system - Google Patents
Municipal administration sewage treatment system Download PDFInfo
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- CN111039397A CN111039397A CN202010012181.5A CN202010012181A CN111039397A CN 111039397 A CN111039397 A CN 111039397A CN 202010012181 A CN202010012181 A CN 202010012181A CN 111039397 A CN111039397 A CN 111039397A
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- 239000010865 sewage Substances 0.000 title claims abstract description 48
- 238000005273 aeration Methods 0.000 claims abstract description 162
- 239000010802 sludge Substances 0.000 claims abstract description 69
- 238000004062 sedimentation Methods 0.000 claims abstract description 33
- 238000000855 fermentation Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 238000004321 preservation Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 27
- 239000001301 oxygen Substances 0.000 claims description 27
- 229910052760 oxygen Inorganic materials 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005189 flocculation Methods 0.000 claims description 13
- 230000016615 flocculation Effects 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 4
- 230000001706 oxygenating effect Effects 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 12
- 244000005700 microbiome Species 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000005202 decontamination Methods 0.000 description 4
- 230000003588 decontaminative effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000004151 fermentation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- -1 leaves Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001766 physiological effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
- C02F3/1284—Mixing devices
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
- C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
-
- 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
- C02F2301/10—Temperature conditions for biological treatment
- C02F2301/106—Thermophilic treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Activated Sludge Processes (AREA)
Abstract
The embodiment of the invention discloses a municipal sewage treatment system, which comprises: a preliminary sedimentation tank; the aeration tank is connected with the pre-sedimentation tank, and an aeration device capable of lifting and rotating is arranged in the aeration tank; the sedimentation tank is connected with the aeration tank; the sludge treatment unit comprises a sludge circulation pipeline for returning most of the activated sludge in the sedimentation tank to the aeration tank and a sludge discharge pipeline for discharging the residual sludge in the sedimentation tank; the anaerobic fermentation tank is used for receiving the sludge in the pre-settling tank and the sludge discharge pipeline and performing anaerobic fermentation to generate methane; the heat preservation heating unit is used for supplying heat generated by biogas combustion to the aeration tank to raise the temperature; in the embodiment of the invention, the residual sludge in the sedimentation tank is discharged into the anaerobic fermentation tank for anaerobic fermentation to generate the biogas, the biogas is used as a heating energy source to heat the aeration tank in winter, the influence of the too low temperature in the aeration tank on the activity of microorganisms is avoided, and the secondary utilization of the sludge is realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of sewage treatment, in particular to a municipal sewage treatment system.
Background
Municipal sewage is a general term for municipal sewage, which also includes domestic sewage, industrial sewage, and the like; for the discharge of industrial sewage, the state sets up relevant standards, and enterprises which produce a large amount of sewage need to have sewage treatment capacity, and can discharge the sewage after reaching the discharge standard; but domestic water has no relevant standard; domestic sewage is mainly treated by a sewage treatment plant; because domestic sewage contains a large amount of organic matters, an activated sludge method is generally adopted for treatment in the prior art.
The core of the activated sludge process is an aeration tank and a sedimentation tank, sewage mixed with sludge enters the aeration tank, organic matters in the sewage are eliminated through the adsorption and degradation of microorganisms on the organic matters, and then the sewage is precipitated through the sedimentation tank, so that upper layer clear water flows into a clear water tank.
The optimum temperature range of the aerobic activated sludge microorganisms in the aeration tank for normal physiological activities is 15-30 ℃. Generally, when the temperature of the water is lower than 10 ℃ or higher than 35 ℃, the function of the aerobic activated sludge is adversely affected. When the temperature is higher than 40 ℃ or lower than 5 ℃, the operation can be stopped completely, so that the heat preservation in a sewage plant in winter is generally realized by manufacturing an integral plant to wrap all biological ponds in the plant, and the plant is generally made of a heat preservation plate material of a color steel plate and foam. Because the span of the biological pond is large, the large-span factory building is needed. The self weight of the material of the heat insulation plate is large, a large number of I-shaped steel is adopted in a factory building to be used as structural support, and the overall investment is large; the other is to heat the aeration tank by electric heating, but the mode has large dependence on electric energy and high cost.
Disclosure of Invention
Therefore, the embodiment of the invention provides a municipal sewage treatment system, which aims to solve the problems that the normal activity of aerobic activated sludge microorganisms is influenced due to too low temperature of an aeration tank in winter, a heat-preservation factory is built, and the electric heating cost is high in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
an industrial wastewater treatment system comprising:
a preliminary sedimentation tank;
the aeration tank is connected with the pre-sedimentation tank, and an aeration device capable of lifting and rotating is arranged in the aeration tank;
the sedimentation tank is connected with the aeration tank;
the sludge treatment unit comprises a sludge circulation pipeline for returning most of the activated sludge in the sedimentation tank to the aeration tank and a sludge discharge pipeline for discharging the residual sludge in the sedimentation tank;
the anaerobic fermentation tank is used for receiving the sludge in the pre-settling tank and the sludge discharge pipeline and performing anaerobic fermentation to generate methane;
and the heat preservation heating unit is used for supplying heat generated by biogas combustion to the aeration tank for heating.
The embodiment of the invention is further characterized in that the aeration device comprises an aeration pipe for oxygenating the aeration tank and a fixing plate for installing the aeration pipe, the fixing plate is horizontally installed in the middle of the aeration tank, a threaded hole is formed in the middle of the fixing plate, external threads meshed with the threaded hole are arranged on the periphery of the aeration pipe, the aeration pipe penetrates through the threaded hole, and a waterproof motor for driving the aeration pipe to rotate and lift along the threaded hole is arranged at the top of the aeration pipe.
The embodiment of the invention is further characterized in that the aeration pipe comprises a pipe body penetrating through the threaded hole, aeration rings annularly arranged on the pipe body and positioned at the upper end and the lower end of the fixing plate, and an oxygen supply mechanism for supplying oxygen to the aeration rings, the oxygen supply mechanism comprises an oxygen generator arranged outside the aeration tank, the outlet end of the oxygen generator penetrates through the bottom of the aeration tank through an oxygen supply pipe and extends into the pipe body, and branch pipes communicated with the aeration rings are arranged at positions of the oxygen supply pipe corresponding to each aeration ring.
The embodiment of the invention is also characterized in that a plurality of aeration heads are uniformly distributed on the periphery of the aeration ring, one end of each aeration head is hinged with the aeration ring in a way of rotating up and down, the other end of each aeration head is provided with an aeration hole, a plurality of branch pipes corresponding to each aeration ring are arranged, and the plurality of branch pipes are communicated with the aeration heads in a one-to-one correspondence way.
The embodiment of the invention is further characterized in that the heat-preservation heating unit comprises a biogas collecting tank for collecting biogas generated by the anaerobic fermentation tank and a burner connected with the biogas collecting tank, a heat conduction layer is arranged on the periphery of the aeration tank, and the burner is arranged below the heat conduction layer and used for heating the heat conduction layer.
The heat conduction layer comprises a liquid storage cavity which is arranged at the bottom of the aeration tank and contains heat conduction liquid, and a heat transfer pipe which is wound on the periphery of the aeration tank, wherein the inlet of the heat transfer pipe is communicated with the lower part of the liquid storage cavity, the outlet of the heat transfer pipe is communicated with the upper part of the liquid storage cavity, and the heat transfer pipe is provided with a reflux pump.
The embodiment of the invention is also characterized in that the combustor comprises a combustion chamber connected with the bottom of the liquid storage cavity, a biogas pipe extending into the combustion chamber and an igniter, and the gas inlet end of the biogas pipe is connected with the biogas collecting tank.
The embodiment of the invention is also characterized in that an airflow mixing piece for stirring the sludge is arranged in the anaerobic fermentation tank, and an air inlet of the airflow mixing piece is communicated with the biogas collection tank through an air conveying pipe.
The embodiment of the invention is also characterized in that the air flow mixing piece comprises an air pipe connected with the air conveying pipe, the top of the air pipe is rotatably sleeved with an air injection sleeve through a bearing, and a plurality of air injection holes are uniformly distributed on the periphery of the air injection sleeve.
The embodiment of the invention is further characterized in that the primary sedimentation tank sequentially comprises a grid area, a biological flocculation area and a sludge concentration area, wherein a water outlet of the grid area is communicated with a water inlet at the upper part of the biological flocculation area, a water outlet at the upper part of the biological flocculation area is communicated with a water inlet of the aeration tank, a sludge discharge port at the bottom of the biological flocculation area is communicated with the sludge concentration area, and an outlet of the sludge concentration area is communicated with the anaerobic fermentation tank.
The embodiment of the invention has the following advantages:
(1) in the embodiment of the invention, a part of sludge precipitated in the sedimentation tank flows back to the aeration tank for normal biological decontamination of the aeration tank, and the rest sludge is discharged into the anaerobic fermentation tank for anaerobic fermentation to generate methane, the methane is used as heating energy to heat the aeration tank in winter, so that the activity of microorganisms is prevented from being influenced by too low temperature in the aeration tank, the biological decontamination capability of the aeration tank is reduced, and the methane is used as clean energy from anaerobic fermentation of the rest sludge, the secondary use of the sludge is realized, and the rest sludge is further purified;
(2) the aeration device in the embodiment of the invention is provided with the aeration device which can be lifted and rotated, compared with the traditional aeration device fixed at the bottom of the tank, the aeration range of the aeration device is enlarged, aeration is not started from the bottom of the aeration tank, and the aeration device has good aeration effect on each position in the aeration tank and is not easy to have aeration dead angles; simultaneously the rotation can play the effect of stirring sewage for mud and sewage mix better, and mud is difficult for deposiing, and sewage is producing rotatoryly by the stirring process simultaneously, increases the area of contact of aqueous vapor, makes the aqueous vapor dissolve more easily, thereby increases the concentration of dissolved oxygen in the sewage fast.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of an aeration apparatus according to an embodiment of the present invention.
In the figure:
1-an aeration tank; 2-a sedimentation tank; 3-a sludge circulation pipeline; 4-sludge discharge pipeline; 5-anaerobic fermentation tank; 6-a biogas collection tank; 7-a burner; 8-a thermally conductive layer; 9-a grating zone; 10-a bioflocculation zone; 20-a sludge concentration zone;
11-an aerator pipe; 12-a fixing plate; 13-a waterproof motor;
111-a tube body; 112-an aeration ring; 113-an aeration head; 114-an oxygen generator; 115-an oxygen supply tube; 116-a branch pipe;
51-a gas pipe; 52-a breather pipe; 53-air-jet sleeve;
71-a combustion chamber; 72-biogas pipe; 73-an igniter;
81-liquid storage cavity; 82-a heat transfer tube; 83-reflux pump.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an industrial sewage treatment system comprising:
a preliminary sedimentation tank;
the aeration tank 1, the aeration tank 1 is connected with the preliminary sedimentation tank, and an aeration device which can be lifted and rotated is arranged in the aeration tank 1;
the sedimentation tank 2, the sedimentation tank 2 is connected with the aeration tank 1;
a sludge treatment unit which comprises a sludge circulation pipeline 3 for returning most of the activated sludge in the sedimentation tank 2 to the aeration tank 1 and a sludge discharge pipeline 4 for discharging the residual sludge in the sedimentation tank 2;
the anaerobic fermentation tank 5 is used for receiving the sludge in the pre-settling tank and the sludge discharge pipeline 4 and carrying out anaerobic fermentation to generate methane;
and the heat preservation heating unit is used for supplying heat generated by biogas combustion to the aeration tank 2 for heating.
Based on the components of the sewage treatment device, the embodiment of the invention is characterized in that the aeration tank 1 can be heated in cold winter to improve the biological activity of the activated sludge, specifically, a part of the sludge precipitated in the sedimentation tank 2 flows back to the aeration tank 1 for the normal biological decontamination effect of the aeration tank 1, the rest sludge and the precipitate of the pre-sedimentation tank are discharged into the anaerobic fermentation tank 5 together for anaerobic fermentation to generate methane, the methane is used as a heating energy source to heat the aeration tank 1 in winter, the temperature in the aeration tank 1 is prevented from being too low to influence the activity of microorganisms, so that the biological decontamination capability of the aeration tank 1 is reduced, and the methane is used as a clean energy source to be from the anaerobic fermentation of the rest sludge, thereby realizing the secondary use of the sludge and further purifying the rest sludge.
In order to improve the aeration effect of the aeration device, the embodiment of the invention also optimizes the structure of the aeration device, and specifically, the aeration device comprises an aeration pipe 11 for oxygenating the aeration tank 1 and a fixing plate 12 for installing the aeration pipe 11, the fixing plate 12 is horizontally installed in the middle of the aeration tank 1, a threaded hole is formed in the middle of the fixing plate 12, an external thread meshed with the threaded hole is arranged on the periphery of the aeration pipe 11, the aeration pipe 11 is arranged in the threaded hole in a penetrating manner, and a waterproof motor 13 for driving the aeration pipe 11 to rotate and lift along the threaded hole is arranged at the top of the aeration pipe 11.
The traditional aeration device is generally paved at the bottom of a pool, oxygen is introduced into sewage through aeration holes, the aeration position is fixed, and the situation that the sewage close to one side of the aeration device is more in oxygen filling amount and the sewage far away from one side is less exists; simultaneously the rotation can play the effect of stirring sewage for mud and sewage mix better, and mud is difficult for deposiing, and sewage is producing rotatoryly by the stirring process simultaneously, increases the area of contact of aqueous vapor, makes the aqueous vapor dissolve more easily, thereby increases the concentration of dissolved oxygen in the sewage fast.
Further, as shown in fig. 2, the aeration pipe 11 includes a pipe body 111 inserted into the threaded hole, aeration rings 112 annularly installed on the pipe body 111 and located at the upper and lower ends of the fixing plate, and an oxygen supply mechanism for supplying oxygen to the aeration rings 112, the oxygen supply mechanism includes an oxygen generator 114 disposed outside the aeration tank 1, an outlet end of the oxygen generator 114 penetrates through the bottom of the aeration tank 1 through an oxygen supply pipe 115 and extends into the pipe body 111, and a branch pipe 116 communicated with the aeration rings 112 is disposed at a position of the oxygen supply pipe 115 corresponding to each aeration ring 112.
When the aeration pipe 11 moves up and down along the fixing plate 12, the aeration pipe 11 also rotates by the principle of spiral rotation, and sewage is stirred under the driving of rotation, so that the oxygenation effect is further improved.
Meanwhile, in order to avoid that the aeration opening on the aeration ring 112 is blocked by sludge after the aeration of the aeration ring 112 is stopped, in the embodiment of the invention, a plurality of aeration heads 113 are uniformly distributed on the periphery of the aeration ring 112, one end of each aeration head 113 is hinged with the aeration ring 112 in a way of rotating up and down, the other end of each aeration head 113 is provided with an aeration hole, a plurality of branch pipes 116 corresponding to each aeration ring 112 are arranged, and the plurality of branch pipes 116 are communicated with the aeration heads 113 in a one-to-one correspondence way.
The specific structure of the heat preservation heating unit is as follows: the biogas digester comprises a biogas collecting tank 6 for collecting biogas generated by an anaerobic fermentation tank 5 and a burner 7 connected with the biogas collecting tank 6, wherein a heat conduction layer 8 is arranged on the periphery of the aeration tank 2, and the burner 7 is arranged below the heat conduction layer 8 and used for heating the heat conduction layer 8.
The heat conduction layer 8 includes a liquid storage cavity 81 which is arranged at the bottom of the aeration tank 1 and contains heat conduction liquid and a heat transfer pipe 82 which is wound on the periphery of the aeration tank 1, the inlet of the heat transfer pipe 82 is communicated with the lower part of the liquid storage cavity 81, the outlet of the heat transfer pipe 82 is communicated with the upper part of the liquid storage cavity 81, and a reflux pump is arranged on the heat transfer pipe 82.
The liquid storage cavity 81 is used for heating the bottom of the aeration tank 1, and the heat transfer pipe 82 is used for assisting in heating the middle of the aeration tank 1 so as to increase the heating area of the aeration tank 1.
The combustor 7 comprises a combustion chamber 71 connected with the bottom of the liquid storage cavity 81, a biogas pipe 72 extending into the combustion chamber 71 and an igniter 73, wherein the gas inlet end of the biogas pipe 72 is connected with the biogas collection tank 6.
The purpose of the burner 7 is to ignite the biogas to heat the liquid storage cavity 81, and in the actual sludge treatment, a thermometer can be arranged in the aeration tank 1 to display the temperature in the aeration tank 1 in real time so as to stop the combustion of the burner 7 at a proper temperature; the liquid in the liquid storage cavity 81 can be kept heated at low temperature in the aeration tank 81 by using a low-boiling-point solution, so that the death of microorganisms in the activated sludge caused by heating transition is avoided.
In the fermentation process of the anaerobic fermentation tank 5, the fermentation materials in the anaerobic fermentation tank 5 are usually required to be stirred and turned to improve the fermentation effect, the traditional stirring mode is a mechanical stirring mode, in the embodiment, methane is pumped out from the top and then is flushed into the tank from the bottom, and strong gas backflow is generated to achieve the stirring purpose.
Specifically, an airflow mixing part for stirring the sludge is arranged in the anaerobic fermentation tank 5, and an air inlet of the airflow mixing part is communicated with the biogas collection tank 6 through an air conveying pipe 51.
The air flow mixing piece comprises a vent pipe 52 connected with an air pipe 51, the top of the vent pipe 52 is rotatably sleeved with an air injection sleeve 53 through a bearing, and a plurality of air injection holes are uniformly distributed on the periphery of the air injection sleeve 53.
Because the evenly distributed gas injection holes are symmetrically arranged on the periphery of the gas injection sleeve 53, the gas injection sleeve 53 can rotate in the gas injection process, so that the sludge in the anaerobic fermentation tank 5 is rotationally injected, and the purpose of gas flow stirring is achieved.
In addition, the purpose of the primary sedimentation tank is to primarily settle large particles and suspended matters in sewage, in the embodiment of the invention, the primary sedimentation tank sequentially comprises a grid area 9, a biological flocculation area 10 and a sludge concentration area 20, a water outlet of the grid area 9 is communicated with a water inlet at the upper part of the biological flocculation area 10 and is used for separating impurities with larger volume in sewage, such as leaves, garbage and the like, the biological flocculation tank 10 primarily treats the sewage rich in high-concentration organic matters, a water outlet at the upper part of the biological flocculation area 10 is communicated with a water inlet of the aeration tank 1, a sludge discharge port at the bottom of the biological flocculation area 10 is communicated with the sludge concentration area 20, and an outlet of the sludge concentration area 20 is communicated with the anaerobic fermentation tank 5.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A municipal sewage treatment system comprising:
a preliminary sedimentation tank;
the aeration tank (1), the aeration tank (1) is connected with the pre-sedimentation tank, and an aeration device capable of lifting and rotating is arranged in the aeration tank (1);
the sedimentation tank (2), the sedimentation tank (2) is connected with the aeration tank (1);
a sludge treatment unit which comprises a sludge circulation pipeline (3) for returning most of the activated sludge in the sedimentation tank (2) to the aeration tank (1) and a sludge discharge pipeline (4) for discharging the residual sludge in the sedimentation tank (2);
the anaerobic fermentation tank (5) is used for receiving the sludge in the pre-settling tank and the sludge discharge pipeline (4) to perform anaerobic fermentation to generate biogas;
and the heat preservation heating unit is used for supplying heat generated by biogas combustion to the aeration tank (2) for heating.
2. The municipal sewage treatment system according to claim 1, wherein the aeration device comprises an aeration pipe (11) for oxygenating the aeration tank (1) and a fixing plate (12) for mounting the aeration pipe (11), the fixing plate (12) is horizontally mounted in the middle of the aeration tank (1) and a threaded hole is formed in the middle of the fixing plate (12), the circumference of the aeration pipe (11) is provided with external threads engaged with the threaded hole, the aeration pipe (11) is inserted into the threaded hole, and the top of the aeration pipe (11) is provided with a waterproof motor (13) for driving the aeration pipe (11) to rotate and ascend along the threaded hole.
3. The municipal sewage treatment system according to claim 2, wherein the aeration pipe (11) comprises a pipe body (111) inserted into the threaded hole, aeration rings (112) annularly installed on the pipe body (111) and located at the upper and lower ends of the fixing plate, and an oxygen supply mechanism for supplying oxygen to the aeration rings (112), the oxygen supply mechanism comprises an oxygen generator (114) arranged outside the aeration tank (1), the outlet end of the oxygen generator (114) penetrates the bottom of the aeration tank (1) through an oxygen supply pipe (115) and extends into the pipe body (111), and a branch pipe (116) communicated with the aeration rings (112) is arranged on the oxygen supply pipe (115) at a position corresponding to each aeration ring (112).
4. The municipal sewage treatment system according to claim 3, wherein a plurality of aeration heads (113) are uniformly distributed on the periphery of the aeration ring (112), one end of each aeration head (113) is hinged to the aeration ring (112) in a vertically rotatable manner, the other end of each aeration head (113) is provided with an aeration hole, a plurality of branched pipes (116) are arranged at positions corresponding to the aeration rings (112), and the branched pipes (116) are communicated with the aeration heads (113) in a one-to-one correspondence manner.
5. The municipal sewage treatment system according to claim 1, wherein the heat-insulating and heating unit comprises a biogas collection tank (6) for collecting biogas generated by the anaerobic fermentation tank (5) and a burner (7) connected to the biogas collection tank (6), a heat conductive layer (8) is disposed on the periphery of the aeration tank (2), and the burner (7) is disposed below the heat conductive layer (8) for heating the heat conductive layer (8).
6. The municipal sewage treatment system according to claim 5, wherein the heat conducting layer (8) comprises a liquid storage chamber (81) which is arranged at the bottom of the aeration tank (1) and contains heat conducting liquid, and a heat transfer pipe (82) which is wound around the periphery of the aeration tank (1), wherein an inlet of the heat transfer pipe (82) is communicated with the lower part of the liquid storage chamber (81), an outlet of the heat transfer pipe (82) is communicated with the upper part of the liquid storage chamber (81), and a reflux pump is mounted on the heat transfer pipe (82).
7. The municipal sewage treatment system according to claim 6, wherein the burner (7) comprises a combustion chamber (71) connected to the bottom of the reservoir (81), and a biogas pipe (72) and an igniter (73) extending into the combustion chamber (71), wherein the inlet end of the biogas pipe (72) is connected to the biogas collection tank (6).
8. The municipal sewage treatment system according to claim 5, wherein an air mixing part for stirring sludge is arranged inside the anaerobic fermentation tank (5), and an air inlet of the air mixing part is communicated with the biogas collection tank (6) through an air pipe (51).
9. The municipal sewage treatment system according to claim 8, wherein the air mixing part comprises a vent pipe (52) connected to the air delivery pipe (51), the top of the vent pipe (52) is rotatably sleeved with an air injection sleeve (53) through a bearing, and a plurality of air injection holes are uniformly distributed on the periphery of the air injection sleeve (53).
10. The municipal sewage treatment system according to claim 1, wherein the primary sedimentation tank comprises a grid area (9), a biological flocculation area (10) and a sludge concentration area (20) in sequence, a water outlet of the grid area (9) is communicated with a water inlet at the upper part of the biological flocculation area (10), a water outlet at the upper part of the biological flocculation area (10) is communicated with a water inlet of the aeration tank (1), a sludge outlet at the bottom of the biological flocculation area (10) is communicated with the sludge concentration area (20), and an outlet of the sludge concentration area (20) is communicated with the anaerobic fermentation tank (5).
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