CN216472742U - Sewage treatment system capable of realizing energy recycling - Google Patents
Sewage treatment system capable of realizing energy recycling Download PDFInfo
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- CN216472742U CN216472742U CN202123101150.6U CN202123101150U CN216472742U CN 216472742 U CN216472742 U CN 216472742U CN 202123101150 U CN202123101150 U CN 202123101150U CN 216472742 U CN216472742 U CN 216472742U
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Abstract
The utility model discloses a can realize energy recovery and utilize's sewage treatment system, include: the filtering and sand settling device is respectively provided with a sewage inlet and a sand settling water outlet, and the sand settling water outlet is sequentially connected with the chemical strengthening treatment tank, the primary settling tank, the biochemical treatment tank and the secondary settling tank; the sludge discharge pipes of the primary sedimentation tank and the secondary sedimentation tank are both connected with a sludge pump room; a sludge outlet pipe of the sludge pump room is sequentially connected with the concentration tank, the sludge anaerobic digestion tank and the sludge dewatering machine room; the sludge dewatering machine room is respectively provided with a sludge outward conveying port and a sludge digestion dewatering liquid outlet, and the sludge digestion dewatering liquid outlet is sequentially connected with the coagulating sedimentation tank and the anaerobic ammonia oxidation tank. The chemical strengthening treatment tank is used as primary treatment, so that the sludge yield is improved, the carbon source separation is realized, and a foundation is laid for subsequent energy recovery and balance; the sludge digestion liquid is treated by matching the coagulating sedimentation tank and the anaerobic ammonia oxidation tank, so that the impact of total nitrogen in the digestion liquid on incoming water is effectively reduced, the effluent is ensured to reach the standard, and the operation of the whole system is stabilized.
Description
Technical Field
The utility model relates to a sewage treatment field especially relates to a sewage treatment system.
Background
In the traditional sewage treatment process, the COD degradation mode is mainly aerobic decomposition, and then is used for nitrogen and phosphorus removal, anaerobic digestion and sludge treatment. Carbon sources in sewage are generally accepted at home and abroad as valuable resources and can be used for energy production (anaerobic digestion). The diversion of biodegradable organics in wastewater from secondary biochemical degradation to carbon recovery is called carbon diversion.
At present, the carbon diversion technology can be realized by a first-stage precipitation method, a high-load activated sludge process, an anaerobic treatment process and the like. The existing sewage treatment system utilizing the primary sedimentation method is composed of a primary sedimentation tank, but the sewage treatment system utilizing the primary sedimentation method has SS and BOD due to the fact that a coagulant is not added and the like5And the TP treatment efficiency is not high, and the energy recovery effect is not good.
In view of this, the present invention is especially provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can realize energy recovery and utilize's sewage treatment system can effectively improve the recycle ratio of organic carbon source in the sewage, realizes sewage factory energy saving and consumption reduction, and then solves the above-mentioned technical problem that exists among the prior art.
The utility model aims at realizing through the following technical scheme:
the embodiment of the utility model provides a can realize energy recovery and utilize's sewage treatment system, include:
the system comprises a filtering sand settling device, a chemical strengthening treatment tank, a primary settling tank, a biochemical treatment tank, a secondary settling tank, a sludge pump room, a concentration tank, a sludge anaerobic digestion tank, a sludge dewatering machine room, a drainage regulating tank, a coagulating sedimentation tank and an anaerobic ammonia oxidation tank; wherein the content of the first and second substances,
the filtering and sand settling device is respectively provided with a sewage inlet and a sand settling water outlet, and the sand settling water outlet is sequentially connected with the chemical strengthening treatment tank, the primary settling tank, the biochemical treatment tank and the secondary settling tank;
the sludge discharge pipes of the primary sedimentation tank and the secondary sedimentation tank are both connected with the sludge pump room;
a sludge outlet pipe of the sludge pump room is sequentially connected with the concentration tank, the sludge anaerobic digestion tank and the sludge dewatering machine room;
the sludge dewatering machine room is respectively provided with a sludge outward conveying port and a sludge digestion dewatering liquid outlet, and the sludge digestion dewatering liquid outlet is sequentially connected with the coagulating sedimentation tank and the anaerobic ammonia oxidation tank.
Compared with the prior art, the utility model provides a can realize energy recovery and utilize's sewage treatment system, its beneficial effect includes:
the primary treatment is carried out by arranging the chemical strengthening treatment tank, so that the sludge yield is improved, the separation of a carbon source is realized, and a foundation is laid for subsequent energy recovery and energy balance; meanwhile, the retention time of the active sludge section AO pool is designed to be 3 hours of the anoxic pool and 3 hours of the aerobic pool, the aerobic pool is provided with an oxygen dissolving instrument, the internal reflux ratio is designed to be 100-300%, and the sludge reflux ratio is designed to be 50-100%. By adopting a higher reflux ratio, the denitrification efficiency can be effectively improved, and the requirement of advanced treatment on water inlet is met; in the anaerobic sludge digestion stage, the sludge digestion liquid is treated by matching the coagulating sedimentation tank and the anaerobic ammonia oxidation tank, so that the impact of total nitrogen in the digestion liquid on incoming water is effectively reduced, the effluent water is ensured to reach the standard, and the stable operation of the whole system is guaranteed; the system can conveniently use the marsh gas generated by the sludge anaerobic digestion tank for power generation, thereby realizing the recycling of energy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a sewage treatment system capable of recycling energy provided by an embodiment of the present invention, wherein biogas generated by a sludge anaerobic digestion tank can be used for power generation;
FIG. 2 is a process flow diagram of a sewage treatment system capable of recycling energy provided by the embodiment of the present invention;
in the figure: 1-coarse grating; 2-lifting the pump station; 3-fine grating; 4-a grit chamber; 5-a chemical strengthening treatment tank; 6-primary settling tank; 7-biochemical treatment pool; 8-a secondary sedimentation tank; 9-distributing well; 10-a blower room; 11-sludge pump house; 12-a concentration tank; 13-sludge anaerobic digestion tank; 14-sludge dewatering machine room; 15-a drainage regulating tank; 16-a coagulating sedimentation tank; 17-anaerobic ammonia oxidation tank.
Detailed Description
The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the drawings in the embodiment of the present invention; it is to be understood that the embodiments described are only some embodiments, not all embodiments, and are not to be construed as limiting the invention. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The terms that may be used herein are first described as follows:
the term "and/or" means that either or both can be achieved, for example, X and/or Y means that both cases include "X" or "Y" as well as three cases including "X and Y".
The terms "comprising," "including," "containing," "having," or other similar terms of meaning should be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.
The term "consisting of … …" is meant to exclude any technical feature elements not explicitly listed. If used in a claim, the term shall render the claim closed except for the inclusion of the technical features that are expressly listed except for the conventional impurities associated therewith. If the term occurs in only one clause of the claims, it is defined only to the elements explicitly recited in that clause, and elements recited in other clauses are not excluded from the overall claims.
The term "parts by mass" is intended to indicate a mass ratio relationship between a plurality of components, for example: if X component is X parts by mass and Y component is Y parts by mass, the mass ratio of the X component to the Y component is X: Y; 1 part by mass may represent any mass, for example: 1 part by mass may be expressed as 1kg or 3.1415926 kg. The sum of the parts by mass of all the components is not necessarily 100 parts, and may be more than 100 parts, less than 100 parts, or equal to 100 parts. Parts, ratios and percentages described herein are by mass unless otherwise indicated.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured," etc., are to be construed broadly, as for example: can be fixedly connected, can also be detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms herein can be understood by those of ordinary skill in the art as appropriate.
When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as ranges of values, the ranges are to be understood as specifically disclosing all ranges formed from any pair of upper, lower, and preferred values within the range, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 ~ 8" is recited, then the numerical range should be interpreted to include ranges of "2 ~ 7", "2 ~ 6", "5 ~ 7", "3 ~ 4 and 6 ~ 7", "3 ~ 5 and 7", "2 and 5 ~ 7", and the like. Unless otherwise indicated, the numerical ranges recited herein include both the endpoints thereof and all integers and fractions within the numerical range.
The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description only, and are not intended to imply or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting herein.
The following is a detailed description of the sewage treatment system capable of recycling energy provided by the present invention. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art. The embodiment of the present invention does not indicate specific conditions, and the operation is performed according to conventional conditions in the art or conditions suggested by the manufacturer. The reagent or the instrument used in the embodiment of the utility model does not indicate the manufacturer, and is a conventional product which can be purchased and obtained through market.
As shown in fig. 1, the embodiment of the present invention provides a sewage treatment system capable of recycling energy, including:
the system comprises a filtering sand settling device, a chemical strengthening treatment tank 5, a primary settling tank 6, a biochemical treatment tank 7, a secondary settling tank 8, a sludge pump room 11, a concentration tank 12, a sludge anaerobic digestion tank 13, a sludge dewatering machine room 14, a drainage regulating tank 15, a coagulating sedimentation tank 16 and an anaerobic ammonia oxidation tank 17; wherein the content of the first and second substances,
the filtering and sand settling device is respectively provided with a sewage inlet and a sand settling water outlet, and the sand settling water outlet is sequentially connected with the chemical strengthening treatment tank 5, the primary settling tank 6, the biochemical treatment tank 7 and the secondary settling tank 8;
the sludge discharge pipes of the primary sedimentation tank 6 and the secondary sedimentation tank 8 are both connected with the sludge pump room 11; discharging the supernatant of the secondary sedimentation tank to an advanced treatment system;
a sludge outlet pipe of the sludge pump room 11 is sequentially connected with the concentration tank 12, the sludge anaerobic digestion tank 13 and the sludge dewatering machine room 14;
the sludge dewatering machine room 14 is respectively provided with a sludge outward conveying port and a sludge digestion dewatering liquid outlet, and the sludge digestion dewatering liquid outlet is sequentially connected with the coagulating sedimentation tank 16 and the anaerobic ammonia oxidation tank 17.
In the system, the supernatant of the secondary sedimentation tank is discharged to an advanced treatment system;
the effluent from the anammox tank 17 is returned to the front end of the filter sand settling device to reduce the total nitrogen load of the incoming water.
In the system, the water inlet end of the chemical strengthening treatment tank 5 is provided with a pipeline mixer, and a sand-settling water outlet of the sand filtering and settling device is communicated with the interior of the chemical strengthening treatment tank 5 through the pipeline mixer.
In the system, the pipeline mixer is provided with a medicament feeding port.
In the system, the filtering and sand settling device consists of a coarse grating 1, a lifting pump station 2, a fine grating 3 and a sand settling tank 4 which are connected in sequence.
The above system further comprises: and the blower room 10 is internally provided with a blower and is connected with an aeration device in the biochemical treatment tank 7 through a pipeline.
In the system, the chemical strengthening treatment tank 5 consists of a mixing tank and a reaction tank which are connected in sequence, the hydraulic retention time of the mixing tank is 10-120 s, and the hydraulic retention time of the reaction tank is 10-30 min.
In the system, the primary sedimentation tank 6 adopts a horizontal sedimentation tank.
In the system, the biochemical treatment tank 7 adopts an AO process biochemical reaction tank;
the hydraulic retention time of the anoxic tank of the biochemical treatment tank 7 is 3H, and the hydraulic retention time of the aerobic tank is 3H;
an oxygen dissolving instrument is arranged in the aerobic tank;
the internal reflux ratio of the aerobic tank to the anoxic tank is 100-300%;
the sludge reflux ratio is 50-100%.
Further, in the above system, the biochemical treatment tank 7 may be any one of an AAO biochemical reaction tank, an SBR biochemical reaction tank, and an MBR biochemical reaction tank. The parameters such as hydraulic retention time, internal and external reflux ratio and the like are matched with the type of the adopted biochemical reaction tank.
In the system, the anaerobic reaction temperature of the sludge anaerobic digestion tank (13) is 33-55 ℃, and the sludge retention time is 20-30 d.
In the system, the water outlet end of the biochemical treatment tank 7 is connected with the water distribution well 9, and the water outlet end of the water distribution well 9 is connected with the water inlet end of the secondary sedimentation tank 8. The sludge hopper of the secondary sedimentation tank 8 is connected with the sludge storage end of the water distribution well 9, the sludge storage end of the water distribution well 9 is respectively connected with the front end of the biochemical treatment tank 7 and the sludge pump room 11, return sludge and residual sludge are respectively provided for the biochemical treatment tank 7 and the sludge pump room 11, and the functions of water inlet distribution of the secondary sedimentation tank 8 and sludge return of the biochemical treatment tank 7 are achieved through the water distribution well 9.
To sum up, the utility model provides a sewage treatment system forms a sewage treatment system based on the chemically enhanced primary treatment process through setting up the filtration sand setting device of organic connection, the chemical enhancement treatment pond, the primary sedimentation tank, the biochemical treatment pond, two heavy ponds, the sludge pump room, the concentrated pond, the mud anaerobic digestion jar, the sludge dewatering machine room, the adjusting tank of draining, coagulating sedimentation tank and anaerobic ammonium oxidation pond, this system has improved the mud output, the separation of carbon source has been realized, establish the basis for subsequent energy recovery and energy balance, optimize technological parameters such as inside and outside reflux ratio of active sludge section simultaneously, reach the requirement of advanced treatment intake; in the sludge anaerobic digestion section, the sludge digestion liquid is treated by the coagulating sedimentation and anaerobic ammonia oxidation process, so that the impact of total nitrogen in the digestion liquid on incoming water is effectively reduced, the effluent water is ensured to reach the standard, the stable operation of the whole system is guaranteed, the sludge anaerobic digestion tank generates biogas for power generation, and the energy recycling is realized.
In order to show the technical scheme and the produced technical effect more clearly, the following is right with concrete embodiment the embodiment of the utility model provides a can realize that energy recovery utilizes's sewage treatment system carries out the detailed description.
Example 1
As shown in FIG. 1, the embodiment of the present invention provides a sewage treatment system capable of recycling energy, which comprises: the device comprises a sand filtering and settling device, a chemical strengthening treatment tank 5, a primary settling tank 6, a biochemical treatment tank 7, a secondary settling tank 8, a sludge pump room 11, a concentration tank 12, a sludge anaerobic digestion tank 13, a sludge dewatering machine room 14, a drainage regulating tank 15, a coagulating sedimentation tank 16 and an anaerobic ammonia oxidation tank 17, can realize sewage treatment of the combination of the chemical strengthening process, the AO process, the anaerobic ammonia oxidation process and the sludge anaerobic digestion, separates non-dissolved organic matters and partial dissolved organic matters in water through the action of chemically strengthening primary treatment, and concentrates the generated sludge into the sludge anaerobic digestion tank after the primary settling tank, and simultaneously adjusts the process parameters of a subsequent biochemical treatment section to ensure that the effluent of the subsequent treatment process reaches the water inlet standard of a deep treatment section. The sludge treatment section mainly adopts a sludge anaerobic digestion tank to produce energy, and denitrifies the supernatant fluid after sludge digestion, and the adopted process is a coagulating sedimentation and anaerobic ammonia oxidation process, thereby finally realizing the purposes of energy conservation, consumption reduction and energy recovery of a sewage plant.
The process flow of the system for treating sewage is shown in figure 2 and comprises the following steps:
the incoming water enters a filtering and sand settling device, the filtering and sand settling device is composed of a coarse grating 1, a lifting pump station 2, a fine grating 3 and a sand settling tank 4 which are connected in sequence, the incoming water is pretreated by the coarse grating 1 to remove floating objects and suspended matters, then the incoming water is conveyed to the fine grating 3 through the lifting pump room 2 to further remove the fine suspended matters, the outgoing water flows into the sand settling tank 4, and the abrasion of gravel on subsequent equipment is reduced;
effluent of the grit chamber 4 automatically flows into a chemical strengthening treatment tank 5, a coagulant and a flocculant are quickly mixed by a pipeline mixer at the front end of the chemical strengthening treatment tank 5 and then enter the chemical strengthening treatment tank 5, the hydraulic retention time of the mixing tank is 10-120 s, and the hydraulic retention time of the reaction tank is 10-30 min; the removal rate of SS by the chemical strengthening treatment tank 5 can reach 90%, the removal rate of COD can reach 50-60%, and the removal rate of Total Phosphorus (TP) can reach 80-90%;
the effluent of the chemical strengthening treatment tank 5 enters a primary sedimentation tank 6 which adopts an advection sedimentation mode, and the organic load is 7m3/m2h, performing sludge-water separation, and enabling the generated sludge to automatically flow into a sludge pump room 11 through a sludge discharge pipe;
the effluent of the primary sedimentation tank 6 enters a biochemical treatment tank 7, the biochemical treatment tank 7 adopts an AO biochemical reaction tank of an AO process, the retention time is an anoxic tank 3H, an aerobic tank 3H, an oxygen dissolving instrument is arranged in the aerobic tank, the internal reflux ratio is 100-300%, and the sludge reflux ratio is 50-100%. By the reflux ratio, the denitrification efficiency can be effectively improved;
sludge in the primary sedimentation tank 6 and sludge in the secondary sedimentation tank 8 automatically flow into a sludge pump room 11 through pipelines and are pumped into a sludge concentration tank 12 through a sludge pump for concentration, the concentrated sludge enters a sludge anaerobic digestion tank 13, a sludge treatment section adopts a sludge medium temperature anaerobic digestion mode, the temperature range is 33-55 ℃, the retention time is 20-30 d, and biogas slurry is treated by a dehydrator of a dehydration machine room 14, dehydrated to 80% of water content and transported outwards; the generated biogas can be conveyed to a generator for power generation and utilization after being separated and purified;
and (3) the sludge digestion dehydration liquid discharged after being treated by the dehydration machine room 14 enters a drainage regulating tank 15, is pumped to a coagulation sedimentation tank 16 for treatment, and the adding concentration of PAC is determined to be 50-200 mg/L and the PAM is determined to be 1-5 mg/L according to the SS concentration. The effluent enters the anaerobic ammonia oxidation tank 17 process section, and the sewage after denitrification treatment is sent to the front end of the fine grid 1 section of the sewage plant.
The utility model discloses a processing system can realize strengthening the coagulating sedimentation function that the technology had based on chemistry, strengthens in the sewage insoluble suspended solid and dissolves the absorption book of attitude colloid and sweep the effect of getting rid of, realizes the maximize separation and the recovery of carbon source to the primary sludge after will separating is used for follow-up anaerobism section productivity, and the feedback is given the sewage plant, thereby reduces sewage plant operation energy consumption, finally reaches the purpose that realizes separation, the recovery and the utilization of carbon source. Meanwhile, the effluent quality is ensured to be discharged up to the standard by optimizing the subsequent sewage biochemical treatment section process and the sewage denitrification treatment process.
It can be appreciated that, in the sewage treatment system of the embodiment, the biochemical treatment tank may also adopt other types of reaction tanks for denitrification, such as: AAO process, SBR, MBR process and the like, and parameters such as hydraulic retention time, internal and external reflux ratio and the like are also adjusted adaptively.
To sum up, the utility model discloses sewage treatment system realizes strengthening the primary treatment with chemistry, activated sludge treatment and one-level mud anaerobic digestion treatment process combine together organically, form the processing system of a combined technology, strengthen the primary treatment effect through chemistry, with 90% SS of aquatic, 50% ~ 60% COD is with the form desorption of mud, adopt the follow-up biochemical treatment section of setting for technological parameter simultaneously, strengthen the denitrogenation effect, realized guaranteeing under the prerequisite that goes out water quality of water is up to standard, the output of surplus sludge has been increased, the rate of energy recovery is improved, be favorable to advancing sewage plant energy recuperation and energy balance.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
Claims (10)
1. The utility model provides a sewage treatment system that can realize energy recovery utilizes which characterized in that includes:
a sand filtering and settling device, a chemical strengthening treatment tank (5), a primary settling tank (6), a biochemical treatment tank (7), a secondary settling tank (8), a sludge pump room (11), a concentration tank (12), a sludge anaerobic digestion tank (13), a sludge dewatering machine room (14), a drainage regulating tank (15), a coagulating sedimentation tank (16) and an anaerobic ammonia oxidation tank (17); wherein the content of the first and second substances,
the filtering and sand settling device is respectively provided with a sewage inlet and a sand settling water outlet, and the sand settling water outlet is sequentially connected with the chemical strengthening treatment tank (5), the primary settling tank (6), the biochemical treatment tank (7) and the secondary settling tank (8);
the sludge discharge pipes of the primary sedimentation tank (6) and the secondary sedimentation tank (8) are both connected with the sludge pump room (11);
a sludge outlet pipe of the sludge pump room (11) is sequentially connected with the concentration tank (12), the sludge anaerobic digestion tank (13) and the sludge dewatering machine room (14);
the sludge dewatering machine room (14) is respectively provided with a sludge outward conveying port and a sludge digestion dewatering liquid outlet, and the sludge digestion dewatering liquid outlet is sequentially connected with the coagulating sedimentation tank (16) and the anaerobic ammonia oxidation tank (17).
2. The sewage treatment system capable of realizing energy recycling according to claim 1, wherein a pipeline mixer is arranged at the water inlet end of the chemical strengthening treatment tank (5), and a sand-settling water outlet of the sand filtering and settling device is communicated with the interior of the chemical strengthening treatment tank (5) through the pipeline mixer.
3. The sewage treatment system capable of realizing energy recycling according to claim 2, wherein a medicament adding port is arranged on the pipeline mixer.
4. The sewage treatment system capable of realizing energy recycling according to any one of claims 1 to 3, wherein the filtering and sand settling device is composed of a coarse grating (1), a lifting pump station (2), a fine grating (3) and a sand settling tank (4) which are connected in sequence.
5. The sewage treatment system capable of realizing energy recycling according to any one of claims 1 to 3, further comprising: and the blower room (10) is internally provided with a blower and is connected with an aeration device in the biochemical treatment tank (7) through a pipeline.
6. The sewage treatment system capable of realizing energy recycling according to any one of claims 1 to 3, wherein the chemical strengthening treatment tank (5) comprises a mixing tank and a reaction tank which are connected in sequence, the hydraulic retention time of the mixing tank is 10-120 s, and the retention time of the reaction tank is 10-30 min.
7. The sewage treatment system capable of realizing energy recycling according to any one of claims 1 to 3, wherein the primary sedimentation tank (6) adopts a horizontal sedimentation tank.
8. The sewage treatment system capable of realizing energy recycling according to any one of claims 1 to 3, wherein the biochemical treatment tank (7) is an AO biochemical reaction tank;
the hydraulic retention time of an anoxic tank of the biochemical treatment tank (7) is 3H, and the hydraulic retention time of an aerobic tank is 3H;
an oxygen dissolving instrument is arranged in the aerobic tank;
the internal reflux ratio of the aerobic tank to the anoxic tank is 100-300%;
the sludge reflux ratio is 50-100%.
9. The sewage treatment system capable of realizing energy recycling according to any one of claims 1 to 3, wherein the biochemical treatment tank (7) is any one of an AAO biochemical reaction tank, an SBR biochemical reaction tank and an MBR biochemical reaction tank.
10. The sewage treatment system capable of realizing energy recycling according to any one of claims 1 to 3, wherein the anaerobic reaction temperature of the sludge anaerobic digestion tank (13) is 33-55 ℃, and the sludge retention time is 20-30 d.
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| CN114835347A (en) * | 2022-05-26 | 2022-08-02 | 苏州科特环保股份有限公司 | System for recovering sewage energy and resource and reducing greenhouse gas emission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114835347A (en) * | 2022-05-26 | 2022-08-02 | 苏州科特环保股份有限公司 | System for recovering sewage energy and resource and reducing greenhouse gas emission |
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