Biological membrane denitrification sewage treatment system
Through the biofilm nitrogen dehydration sewage treatment system, the biofilm solid-load device in the carbon source premix tank and the hypoxia tank is used, combined with the unpowered circulation and aerobic aeration, the existing system has large area, many equipment and complex operations, and the low-cost and efficient total nitrogen degradation effect is achieved.
Patent Information
- Application Number
- CN202422142935.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The existing sewage treatment system covers a large area, has many electrical equipment, is complex in operation, and requires replacement of fillers, resulting in high operating costs and it is difficult to effectively reduce the total nitrogen concentration of the effluent.
A biofilm denitrification sewage treatment system is adopted, including a carbon source premix tank and an oxygen-deficient tank. A biofilm solid-loading device is provided in the oxygen-deficient tank. The distance between the biofilm fillers is 10-300mm. The sewage flows up and down alternately in the oxygen-deficient tank, with a flow rate greater than 1m/h, forming a non-powered circulation mixing, and combining an aerobic tank with an aerobic tank to achieve denitrification and carbon source degradation.
It has achieved low land occupation, low equipment demand and simple operation of sewage nitrogen removal effect, reduced operating and maintenance costs, and can effectively degrade the total nitrogen concentration to meet the Class V standard of the surface.
Smart Images
Figure CN223047353U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewage treatment, in particular to a biological membrane denitrification sewage treatment system. Background Technique
[0002] Generally, new treatment units need to be added to reduce the total nitrogen concentration of the effluent. Processes that can be used include denitrification filters, sulfur autotrophic denitrification filters, Bartonpho process, etc. The denitrification filter and sulfur autotrophic denitrification filter have many electrical equipment and complex operations. In addition, the sulfur autotrophic denitrification filter also has problems such as the need to regularly replace the packing and the possible generation of hydrogen sulfide. The Bartonpho process occupies a large area, has a complex process flow, is cumbersome to operate, and has high investment and operation costs. Therefore, sewage treatment plants need a denitrification sewage treatment system with less land occupation, fewer electrical equipment, simple operation, and no need to replace the packing to reduce the total nitrogen of the effluent. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a fixed-bed biological membrane denitrification sewage treatment system suitable for denitrification of low-pollution water, and to improve the problems of large land occupation, many electrical equipment, complex operation, and need to replace the packing in the existing denitrification process.
[0004] To solve the above problems, the utility model proposes the following technical solutions:
[0005] An embodiment of the utility model provides a biological membrane denitrification sewage treatment system, which includes a carbon source premixing tank and an anoxic tank connected in sequence along the water flow direction. A first biological membrane fixing device is arranged in the anoxic tank; the first biological membrane fixing device includes at least one biological membrane fixing module; the biological membrane fixing module includes a plurality of biologically suspended and fixed membranes. The distance between adjacent biological membrane packings is 10-300 mm; a mixing device is arranged in the carbon source premixing tank.
[0006] Further, the carbon source premixing tank is used to add a carbon source to the influent. The influent and the carbon source are fully stirred and mixed by the mixing device in the carbon source premixing tank and then enter the anoxic tank. The mixing device includes at least one of a mechanical stirrer and a pipeline mixer to mix the carbon source and sewage evenly.
[0007] Further, at least one partition wall is arranged in the anoxic tank. The partition wall divides the anoxic tank into multiple corridors, and each corridor is connected through a flow-through channel. The first biological membrane fixing device is arranged in the corridor, and the sewage flows alternately up or down in adjacent corridors. The sewage passes through the flow-through channel at the bottom or top of the partition wall and enters the adjacent corridor; the setting of the corridor can strengthen the mass transfer effect between the sewage and the biological membrane packing.
[0008] Furthermore, the inlet and outlet water mode of the anoxic tank is bottom-inlet and top-outlet or side-inlet and side-outlet. For the bottom-inlet and top-outlet mode: the inlet pipe of the anoxic tank is arranged at the bottom of the tank, and a collecting trough is set at the top of the tank to collect the outlet water. The water flow direction of the sewage in the anoxic tank is vertically upward as a whole; for the side-inlet and side-outlet mode: in this mode, multiple corridors are usually set in the anoxic tank. By setting the inlet pipe of the anoxic tank in one side corridor of the tank and setting a collecting trough in the opposite side corridor to collect the outlet water. The water flow direction of the sewage in the multiple corridors is vertically upward or downward, and the water flow direction of the sewage in the anoxic tank is horizontally moving as a whole.
[0009] In the above two inlet and outlet water modes, the sewage in the anoxic tank flows upward, downward or alternately upward and downward.
[0010] Furthermore, the sewage flows upward and / or downward in the anoxic tank, and the flow rate is greater than 1 m / h. It can be understood that the biological membrane denitrification sewage treatment system of the present utility model is used for denitrification of low-pollution water, with a large influent flow rate. By controlling the sewage to flow upward, downward or alternately upward and downward in the anoxic tank, and the flow rate is greater than 1 m / h, a non-powered circulation mixing environment can be formed during the operation process of the sewage, and there is no need to set a pushing device or micro-aeration.
[0011] Furthermore, a reflux pipeline can be set in the anoxic tank, which is used to return the supernatant above the anoxic tank to the bottom of the anoxic tank through the reflux pipeline, so as to improve the mixing uniformity of the sewage in the tank and strengthen the mass transfer effect.
[0012] Furthermore, an aerobic tank is also included, and the inlet end of the aerobic tank is connected to the outlet end of the anoxic tank. The sewage is mixed with the carbon source in the carbon source premixing tank and then sequentially passes through the anoxic tank and the aerobic tank. The outlet water of the anoxic tank is introduced into the aerobic tank to degrade the excessive added carbon source in the aerobic tank.
[0013] Furthermore, a second biological membrane fixing device is arranged in the aerobic tank, and an aeration device is arranged at the bottom of the aerobic tank; the second biological membrane fixing device includes at least one biological membrane fixing module; the biological membrane fixing module includes a plurality of biologically suspended and fixed membrane fillers, and the distance between adjacent biological membrane fillers is 10 - 300 mm.
[0014] Furthermore, in the first biological membrane fixing device and the second biological membrane fixing device, the biological membrane fixing module further includes a support rod and a spacer ring; the biological membrane filler is in the shape of a sheet, and a plurality of biological membrane fillers are suspended and arranged in parallel on the support rod; the spacer ring is sleeved on the support rod and is located between two adjacent biological membrane fillers to separate the two adjacent biological membrane fillers.
[0015] Furthermore, the biofilm filler has the functions of high porosity, high biocompatibility, and high adsorption performance. The material is made of one or more of polyester fiber, polypropylene, polyethylene, and polyurethane. A hydrophilic agent and an antistatic agent are applied or sprayed on the surface and inside of the filler. The biofilm filler of the present utility model has a rough and porous surface, strong hydrophilicity and biocompatibility, a fast biofilm formation rate, a large attachment amount, a strong system treatment capacity, a high volume load, and saves land area.
[0016] Furthermore, the filling rate of the biofilm filler in the biofilm immobilization module is 10 - 200 m 2 / m 3 .
[0017] Furthermore, both the first biofilm immobilization device and the second biofilm immobilization device are formed by laying and stacking a plurality of biofilm immobilization modules, and the adjacent biofilm immobilization modules are locked with fasteners.
[0018] Furthermore, in the first biofilm immobilization device and the second biofilm immobilization device, a plurality of the biofilm immobilization modules can form a structure with at least two layers in the vertical direction by stacking, and the hanging directions of the biofilm fillers of the adjacent layers of biofilm immobilization modules are perpendicular to each other. For example, for the biofilm immobilization modules with a two - layer structure, the hanging direction of the biofilm filler of the biofilm immobilization module located in the upper layer faces the east - west direction, and the hanging direction of the biofilm filler of the biofilm immobilization module located in the lower layer faces the north - south direction.
[0019] Taking the water inlet and outlet mode of the anaerobic tank with bottom - inlet and top - outlet as an example, the denitrification sewage treatment method of the biofilm denitrification sewage treatment system provided by the present utility model is described as follows: The sewage is fully mixed with the carbon source in the carbon source premixing tank, enters the bottom of the anaerobic tank, and then exits through the water collection tank at the upper part of the anaerobic tank. The sewage flows upward, collides, cuts, and diffuses with the biofilm filler of the first biofilm immobilization device. The sewage is in full contact with the biofilm filler, and denitrification reaction occurs in the first biofilm immobilization device to reduce nitrate to N2 and overflow by using the energy of degrading the carbon source. The effluent of the anaerobic tank enters the aerobic tank and is in full contact with the biofilm filler in the second biofilm immobilization device under the action of the aeration device. The microorganisms attached to the surface of the biofilm filler completely degrade the carbon source that may be overdosed in the sewage.
[0020] Compared with the prior art, the technical effects that the present utility model can achieve include:
[0021] In the biological membrane denitrification sewage treatment system of the present utility model, there are sufficient flow-through channels with a size of 10 - 300 mm between the biological membrane fillers. Compared with denitrification systems such as denitrifying filters, it does not require backwashing, has fewer supporting devices, simple operation steps, and low operation and maintenance costs. In addition, the biological membrane fixing modules of the first and second biological membrane fixing devices of the present utility model adopt a standardized and modular design method, with simple module assembly and a short construction and installation period. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0023] Figure 1 FIG. 1 is a schematic structural diagram of the biological membrane denitrification sewage treatment system provided in Embodiment 1 of the present utility model.
[0024] Figure 2 FIG. 2 is a front view of a single biological membrane fixing module provided in Embodiment 1 of the present utility model.
[0025] Figure 3 FIG. 3 is a top view of the first biological membrane fixing device 14 provided in Embodiment 1 of the present utility model, and left views of the upper biological membrane fixing module 141, the middle biological membrane fixing module 142, and the lower biological membrane fixing module 143.
[0026] REFERENCE NUMERALS
[0027] Fixed-bed biological membrane denitrification sewage treatment system 1, anoxic tank 11, aerobic tank 12, carbon source premixing tank 13, mechanical stirrer 131;
[0028] First biological membrane fixing device 14, second biological membrane fixing device 15;
[0029] Upper biological membrane fixing module 141, upper biological membrane filler 1411, support rod 1413, spacer ring 1412;
[0030] Middle biological membrane fixing module 142, middle biological membrane filler 1421;
[0031] Lower biological membrane fixing module 143, lower biological membrane filler 1431;
[0032] Inlet pipe 111, first water collection tank 112, water distribution pipe 122, second water collection tank 123, aeration device 121. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Similar component numbers in the drawings represent similar components. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0034] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.
[0035] It should also be understood that the terms used in the specification of the embodiments of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present utility model. As used in the specification of the embodiments of the present utility model and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.
[0036] Embodiment 1
[0037] As Figure 1 shown, this embodiment provides a fixed-bed biofilm denitrification sewage treatment system 1, including a carbon source premixing tank 13, an anoxic tank 11, and an aerobic tank 12. The carbon source premixing tank 13, anoxic tank 11, and aerobic tank 12 are connected in sequence according to the water flow direction.
[0038] The carbon source premixing tank 13 is used to add a carbon source to the influent. After the influent is mixed with the carbon source, it enters the anoxic tank 11. The carbon source premixing tank 13 is provided with a mixing device for uniformly mixing the carbon source and sewage. The mixing device in this embodiment is a mechanical stirrer 131 to uniformly mix the carbon source and sewage.
[0039] The anoxic tank 11 is provided with a first biofilm fixing device 14; the first biofilm fixing device 14 includes at least one biofilm fixing module; the biofilm fixing module includes a plurality of biofilm fillers fixed by hanging. The distance between adjacent biofilm fillers is 10 - 300 mm, forming a flow-through channel.
[0040] The aerobic tank 12 is provided with a second biofilm fixing device 15, and an aeration device 121 is provided at the bottom of the aerobic tank 12; the second biofilm fixing device 15 includes at least one biofilm fixing module; the biofilm fixing module includes a plurality of biofilm fillers fixed by hanging. The distance between adjacent biofilm fillers is 10 - 300 mm, forming a flow-through channel.
[0041] Specifically, the first biofilm immobilization device 14 and the second biofilm immobilization device 15 in this embodiment are both formed by flatly stacking and combining a plurality of biofilm immobilization modules, filling the space of the biochemical tank; the adjacent biofilm immobilization modules are locked with fasteners. The combined form of flatly stacking the biofilm immobilization modules can be arranged according to the space of the anoxic tank 11 and the aerobic tank 12. For example, 2-8 layers are stacked in the vertical direction.
[0042] The first biofilm immobilization device 14 and the second biofilm immobilization device 15 in this embodiment are respectively provided with biofilm immobilization modules stacked in 3 layers. Based on the stacking method of a plurality of biofilm immobilization modules in the vertical direction, the biofilm immobilization modules of the first biofilm immobilization device 14 are divided into an upper biofilm immobilization module 141, a middle biofilm immobilization module 142, and a lower biofilm immobilization module 143 for further illustration. The second biofilm immobilization device 15 can refer to the description of the first biofilm immobilization device 14 and will not be elaborated here.
[0043] The upper biofilm immobilization module 141, the middle biofilm immobilization module 142, and the lower biofilm immobilization module 143 are stacked in the vertical direction in a way that the packing is staggered, and the parallel hanging direction of the packing of the upper module is perpendicular to the parallel hanging direction of the packing of the lower module:
[0044] Specifically, referring to Figure 3 , the upper biofilm immobilization module 141 is rotated 90 degrees in the horizontal plane to obtain the middle biofilm immobilization module 142, so that the hanging direction of the upper biofilm packing 1411 is perpendicular to the middle biofilm packing 1421. The middle biofilm immobilization module 142 is rotated 90 degrees in the horizontal plane to obtain the lower biofilm immobilization module 143, so that the hanging direction of the middle biofilm packing 1421 is perpendicular to the lower biofilm packing 1431; they are stacked in sequence from bottom to top to form the first biofilm immobilization device 14.
[0045] Specifically, in the first biofilm immobilization device 14 and the second biofilm immobilization device 15 of this embodiment, the size of the biofilm immobilization module is designed to be 1.0 m × 1.0 m × 1.0 m (length × width × height); in the biofilm immobilization module of this embodiment, the spacing between adjacent biofilm packings is set to 12 mm.
[0046] Further referring to Figure 2, taking the upper biofilm filler 1411 as an example, the setting of the biofilm filler in the biofilm immobilization module is introduced. The upper biofilm filler 1411 is in the shape of a sheet, and a plurality of upper biofilm fillers 1411 are suspended in parallel on the support rod 1413; a spacer 1412 is provided between two adjacent upper biofilm fillers 1411 to separate the two adjacent upper biofilm fillers 1411 and form a spaced channel; the spacer 1412 is arranged on the support rod 1413.
[0047] Furthermore, the upper biofilm filler 1411 has the functions of high void ratio, high biocompatibility, and high adsorption performance. The material is one or more of polyester fiber, polypropylene, polyethylene, and polyurethane. A hydrophilic agent and an antistatic agent are applied or sprayed on the surface and inside of the filler.
[0048] Specifically, the material of the upper biofilm filler 1411 in this embodiment is polyester fiber.
[0049] Furthermore, the filling rate of the filler in the biofilm immobilization module can be set at 10 - 200 m 2 / m 3 .
[0050] Specifically, the filling rate in the biofilm immobilization module of this embodiment is 50 m 2 / m 3 , and the biofilm attached to the biofilm filler contains specific domesticated functional flora, and the functional flora includes various sewage functional flora such as denitrifying bacteria, Proteobacteria, Bacteroidetes, and Gemmatimonadetes, which can efficiently degrade pollutants such as organic matter and nitrate.
[0051] The water inlet and outlet mode of the anoxic tank 11 in this embodiment is bottom - in and top - out. Specifically, the water inlet pipe 111 is arranged at the bottom of the anoxic tank 11, and a first water collection tank 112 is set at the top to collect the effluent. The water flow direction of the sewage is vertically upward as a whole; the first water collection tank 112 is connected to a water distribution pipe 122 to introduce it into the bottom of the aerobic tank 12. A second water collection tank 123 is arranged at the water outlet end of the aerobic tank 12, and the second water collection tank 123 collects the clear liquid and discharges it as the system effluent. The first water collection tank 112 and the second water collection tank 123 are annular water collection tanks.
[0052] The sewage enters the carbon source premixing tank 13 and is fully mixed with the carbon source, then introduced to the bottom of the anoxic tank 11, and discharged from the first water collecting tank 112. The sewage flows upward and collides, cuts, and diffuses with the biofilm fillers of the upper biofilm solid support module 141, the middle biofilm solid support module 142, and the lower biofilm solid support module 143. The sewage is in full contact with the biofilm, and the biofilm undergoes denitrification reaction to reduce nitrate to N2 and overflow by using the energy of degrading the carbon source. The effluent from the anoxic tank 11 enters the aerobic tank 12 and is in full contact with the biofilm fillers in the second biofilm solid support device 15 under the action of the aeration device 121. The microorganisms attached to the surface of the biofilm fillers completely degrade the carbon source that may be added in excess in the sewage.
[0053] Using the sewage treatment system of this embodiment, the sewage enters the biofilm denitrification sewage treatment system, the carbon source is premixed in the carbon source premixing tank 13, and then undergoes biochemical treatment in the anoxic tank 11 and the aerobic tank 12. The total nitrogen and COD concentrations in the influent and effluent are detected by sampling twice to verify the denitrification effect of the system, as shown in Table 1 specifically. The detection results show that the total nitrogen and COD concentrations of the water treated by the denitrification sewage treatment system of this embodiment stably reach the Class V surface water standard.
[0054] Among them, TN is detected by the alkaline potassium persulfate digestion ultraviolet spectrophotometry method;
[0055] COD is detected by the dichromate method.
[0056] Table 1 Total nitrogen and COD concentrations and denitrification effect of the influent and effluent of the sewage treatment system of this embodiment
[0057]
[0058] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0059] The above is the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A biofilm denitrification wastewater treatment system, characterized in that: It comprises a carbon source premixing tank and anoxic tank which are connected in sequence according to the water flow direction, wherein a first biofilm solidifying device is arranged in the anoxic tank; the first biofilm solidifying device comprises at least one biofilm solidifying module; the biofilm solidifying module comprises a plurality of suspended and fixed biofilm fillers, and the spacing between adjacent biofilm fillers is 10-300mm; a mixing device is arranged in the carbon source premixing tank.
2. The biofilm denitrification wastewater treatment system according to claim 1, characterized in that: The mixing device includes at least one of a mechanical agitator and a pipeline mixer.
3. The biofilm denitrification wastewater treatment system according to claim 1, characterized in that: At least one partition wall is arranged in the anoxic pool, and the partition wall separates the anoxic pool into a plurality of galleries. The galleries are connected through flow passages, and sewage flows alternately upward or downward in adjacent galleries. The first biofilm immobilization device is arranged in the gallery.
4. The biofilm denitrification wastewater treatment system according to claim 1, characterized in that: The water inlet and outlet mode of the anoxic pool is bottom-in and top-out or side-in and side-out.
5. The biofilm denitrification wastewater treatment system according to claim 1, characterized in that: The sewage flows upward and / or downward in the anoxic tank at a flow rate greater than 1 m / h.
6. The biofilm denitrification wastewater treatment system according to claim 1, characterized in that: The anoxic pool is provided with a reflux pipeline for returning the clear liquid above the anoxic pool to the bottom of the anoxic pool through the reflux pipeline.
7. The biofilm denitrification wastewater treatment system according to claim 1, characterized in that: It also comprises an aerobic pool, wherein the water inlet of the aerobic pool is connected to the water outlet of the anoxic pool.
8. The biofilm denitrification wastewater treatment system according to claim 7, characterized in that: A second biofilm immobilization device is arranged in the aerobic pool, and an aeration device is arranged at the bottom of the aerobic pool; the second biofilm immobilization device comprises at least one biofilm immobilization module; the biofilm immobilization module comprises a plurality of suspended and fixed biofilm fillers, and the spacing between adjacent biofilm fillers is 10-300mm.
9. The biofilm denitrification wastewater treatment system according to claim 8, characterized in that: In the first biofilm immobilization device and the second biofilm immobilization device, a plurality of the biofilm immobilization modules can be stacked to form a structure with at least two layers in the vertical direction, and the suspension directions of the biofilm fillers of the biofilm immobilization modules in adjacent layers are perpendicular to each other.
10. The biofilm denitrification wastewater treatment system according to claim 8, characterized in that: The first biofilm fixing device and the second biofilm fixing device are both formed by a plurality of biofilm fixing modules stacked flat and combined, and the adjacent biofilm fixing modules are locked using fasteners.