Sulfur autotrophic denitrification MBR membrane treatment equipment capable of intercepting biological sulfur
By integrating the internal circulating fluidized bed reactor with the MBR membrane unit, the problem of easy loss of powdered sulfur packing material was solved, achieving efficient denitrification treatment of low C/N wastewater, reducing costs and improving the system's biomass and purification effect.
Patent Information
- Application Number
- CN202520059244.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-10
AI Technical Summary
In existing sulfur autotrophic denitrification processes, powdered sulfur filler is easily lost, resulting in low treatment efficiency and high cost. Traditional fixed-bed denitrification biological filters have slow reaction rates, making it difficult to meet the high-efficiency nitrogen removal requirements of low C/N wastewater.
An integrated internal circulation fluidized bed reactor and MBR membrane device is adopted. The biological sulfur powder and denitrifying bacteria are retained through the settling zone and MBR membrane module. Combined with internal circulation and hydraulic flushing, the biological sulfur powder is efficiently settled and the bacteria are retained, thus avoiding loss.
It improved desulfurization load and purification efficiency, reduced treatment costs, enhanced system biomass, reduced membrane fouling, and achieved efficient denitrification treatment of low C/N wastewater.
Smart Images
Figure CN223722928U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, specifically to a sulfur autotrophic denitrification MBR membrane treatment device that can retain biological sulfur. Background Technology
[0002] With the rapid pace of urbanization and industrialization in my country, large amounts of nitrogen are being discharged into water bodies, easily leading to eutrophication. This not only harms aquatic life but also severely disrupts the natural ecological balance. In actual wastewater treatment plants, the influent C / N ratio is less than 6, which is considered low. Traditional heterotrophic denitrification processes typically require the addition of additional carbon sources to meet the electron donor requirements. This not only increases operating costs but may also lead to elevated effluent COD due to excessive carbon source addition. Furthermore, with prolonged operation, filter media wears and is lost, necessitating periodic shutdowns for replacement.
[0003] Sulfur autotrophic denitrification is a process in which denitrifying bacteria utilize inorganic carbon sources (CO3) under anaerobic / anoxic conditions. 2- HCO 3- CO2), in the form of reduced sulfur (S) 0 Pyrite, Na2S, Na2S2O3, H2S, etc.) are used as electron donors, with nitrate (NO) as the electron donor. 3- ) or nitrite (NO 2- The process involves using an electron acceptor to reduce sulfur to nitrogen (N2) while simultaneously converting reduced sulfur into sulfate. Sulfate autotrophic denitrification not only eliminates the need for additional organic carbon sources, reducing organic residue, but also has lower costs and produces less sludge. It is suitable for treating wastewater with a low C / N ratio and is a relatively ideal denitrification method.
[0004] Sulfur autotrophic denitrification processes often employ fixed-bed denitrification biological filters, with sulfur packing as the core component. Currently, most commercially available sulfur packing particles are relatively large, typically 3mm-10mm in diameter, resulting in a small specific surface area and limited contact area with denitrifying bacteria. This necessitates a longer biological solids retention time and a lower surface loading, leading to slow system reaction rates and low efficiency. Powdered sulfur packing, on the other hand, has a large specific surface area, providing ample contact area for microorganisms, resulting in high treatment efficiency and low manufacturing costs. However, powdered sulfur and denitrifying bacteria are easily lost with the effluent, limiting its application. Therefore, those skilled in the art have developed a sulfur autotrophic denitrification MBR membrane treatment device capable of retaining biological sulfur to address the problems mentioned in the background section. Utility Model Content
[0005] The purpose of this invention is to provide a sulfur autotrophic denitrification MBR membrane treatment device that can retain biological sulfur. By optimizing the settling zone and efficiently retaining biological sulfur powder and denitrifying bacteria in the MBR membrane module, the desulfurization load and purification efficiency are improved, and the treatment cost is reduced.
[0006] The utility model discloses a purpose can be realized through the following technical schemes:
[0007] A kind of biological sulfur can be intercepted and sulfur autotrophic denitrification MBR membrane processing equipment, including reactor main body, the inside of the reactor main body has the sedimentation zone and reaction zone for accommodating biological sulfur powder and denitrifying bacteria arranged from top to bottom, wherein, sedimentation zone is the variable diameter straight cylinder of wide upper and narrow lower;
[0008] The inside of the reaction zone is fixedly provided with a flow guide cylinder, and a water distribution head I is arranged on the lower side of the flow guide cylinder inside;
[0009] The MBR membrane assembly is fixedly arranged on the upper side of the sedimentation zone, a partition is arranged on the outside of the MBR membrane assembly, and a blocking screen is fixedly connected to the lower side of the partition at the corner;
[0010] Further, it also includes an internal circulation part, the internal circulation part includes a circulating pump arranged on the outside of the reactor main body, the liquid inlet end of the circulating pump is communicated with the upper side of the reaction zone through a pipeline, and the liquid outlet end is communicated with a water distribution head II located below the water distribution head I.
[0011] Further, it also includes an internal circulation part, the internal circulation part includes a circulating pump arranged on the outside of the reactor main body, the liquid inlet end of the circulating pump is communicated with the upper side of the reaction zone through a pipeline, and the liquid outlet end is communicated with a water distribution head II located below the water distribution head I.
[0012] Further, the liquid inlet part is arranged outside the water inlet tank, and includes a water inlet tank, a water inlet pump and a heat exchanger, the liquid inlet end of the water inlet pump is communicated with the water inlet tank, the liquid outlet end is communicated with the heat exchanger, and the liquid outlet end of the heat exchanger is communicated with the water distribution head I.
[0013] Further, the liquid outlet backwashing part is arranged outside the reactor main body, and includes a water outlet pump, a backwashing pump and a water outlet tank, the liquid inlet end of the water outlet pump is communicated with the MBR membrane assembly, the liquid outlet end is communicated with the water outlet tank, the liquid inlet end of the backwashing pump is communicated with the water outlet tank, and the liquid outlet end is connected with a water distribution head III arranged on the MBR membrane assembly.
[0014] Further, the upper end of the reactor main body is fixedly connected with a sealing cover, and the top of the sealing cover is provided with an exhaust pipe.
[0015] Further, the lower end and the upper end of one side of the reactor main body are fixedly provided with a vent valve and an overflow pipe respectively, and the outside of the reactor main body is provided with two online thermometers, and the two online thermometers are used to monitor the temperature in the reaction zone.
[0016] The utility model discloses the beneficial effect:
[0017] The utility model provides a kind of sulphur autotrophic denitrification MBR membrane treatment equipment of biological sulphur can be intercepted, adopt the device of internal circulating fluidized bed reactor and membrane bioreactor integrated, the settling zone of larger diameter is arranged at fluidized bed top, and independent membrane separation zone is isolated by partition, and settling zone is conducive to the settlement of biological sulphur powder and denitrifying bacteria, can reduce the pollution to membrane;MBR membrane component can intercept biological sulphur powder and strain, avoid the loss of biological sulphur powder and strain, can improve the biomass of system, improve purification effect, while independent membrane separation zone when carrying out hydraulic scouring to membrane surface, do not affect the work of settling zone, so that the technical scheme can directly use biological sulphur powder, need not to be made into sulphur particle filler, effectively reduce processing cost. BRIEF DESCRIPTION OF DRAWINGS
[0018] The utility model will be further described below in connection with the drawings.
[0019] Fig. 1 It is the whole structure diagram of the sulphur autotrophic denitrification MBR membrane treatment equipment of biological sulphur can be intercepted that the utility model proposes;
[0020] Fig. 2 It is the structure diagram of reactor main body in the sulphur autotrophic denitrification MBR membrane treatment equipment of biological sulphur can be intercepted that the utility model proposes.
[0021] Reference signs:
[0022] 1, water inlet tank;2, water inlet pump;3, heat exchanger;4, reactor main body;5, biological sulphur powder;6, flow guide cylinder;7, water distribution head one;8, water distribution head two;9, circulating pump;10, sealing cover;11, partition;12, MBR membrane component;13, water distribution head three;14, intercepting screen;15, water outlet pump;16, backwash pump;17, water outlet tank;18, on-line thermometer;19, vent valve;20, overflow pipe. DETAILED DESCRIPTION
[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely in connection with the drawings in the embodiments of the utility model, obviously, the described embodiments only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.
[0024] Please refer to the drawings of the utility model Figs. 1-2As shown, the utility model embodiment one kind can cut off biological sulfur's sulfur autotrophic denitrification MBR membrane processing equipment, including reactor main body 4, the inside of reactor main body 4 has the sedimentation zone and reaction zone for accommodating biological sulfur powder 5 and denitrifying bacteria with up and down, wherein, the sedimentation zone is the variable diameter straight cylinder of wide upper and narrow lower, such setting can reduce the flow velocity of the upper part of sedimentation zone, guarantee biological sulfur powder 5 and denitrifying bacteria natural sedimentation.
[0025] The inside of reaction zone is fixedly provided with flow guide cylinder 6, water distribution head one 7 is arranged on the inside lower side of flow guide cylinder 6, by setting flow guide cylinder 6, the upflow type reaction structure is formed, wastewater is connected into flow guide cylinder 6 by water distribution head one 7, the water flow is controlled to flow from bottom to top, wastewater is uniformly distributed on biological sulfur powder 5 and denitrifying bacteria, and biological sulfur powder 5 and denitrifying bacteria flow to the sedimentation zone from bottom to top at high speed.
[0026] The upper side of one side of sedimentation zone is fixedly provided with MBR membrane assembly 12, the outer side of MBR membrane assembly 12 is provided with baffle 11, and the lower side of the corner of baffle 11 is fixedly connected with intercepting screen 14, MBR membrane assembly 12 is separated from the sedimentation zone by setting baffle 11, the membrane biological reaction zone is formed, with the accumulation of wastewater in the reaction zone, the sewage after biological denitrification treatment is caused to overflow into the membrane biological reaction zone, under the membrane biological conversion effect, the organic matter in the sewage is further removed, the biomass of the system can be improved, and the purification effect is improved, wherein the intercepting screen 14 can keep the water flow state, and simultaneously plays an intercepting role, prevents the loss of biological sulfur powder 5 and denitrifying bacteria together with MBR membrane assembly 12, and the intercepting screen 14 can also reduce membrane pollution.
[0027] In the embodiment, the membrane material in the MBR membrane assembly 12 can adopt flat sheet membrane, hollow fiber membrane or ceramic membrane.
[0028] In the embodiment, the utility model further includes an internal circulation part, the internal circulation part includes a circulating pump 9 arranged on the outer side of the reactor main body 4, the liquid inlet end of the circulating pump 9 is communicated with the upper side of the reaction zone through a pipeline, and the liquid outlet end is communicated with water distribution head two 8 located below water distribution head one 7; biological sulfur powder and denitrifying bacteria flow to the top of the sedimentation zone from bottom to top at high speed, then are naturally sedimented to the bottom of the reaction zone, and then are introduced into the flow guide cylinder 6 again through water distribution head two 8 by the suction of the circulating pump 9, so as to achieve internal circulation type work, so that the wastewater, biological sulfur powder 5 and denitrifying bacteria are fully contacted, and the denitrification process is more sufficient.
[0029] As an embodiment of the utility model, the utility model further includes an inlet part and an outlet backwashing part, the inlet part is used to introduce wastewater into the reactor main body 4, and the outlet backwashing part is used to discharge liquid and backwash.
[0030] Specific, liquid inlet part is arranged in the outside of water inlet tank 1, including water inlet tank 1, water inlet pump 2 and heat exchanger 3, the liquid inlet end of water inlet pump 2 is communicated with water inlet tank 1, the liquid outlet end is communicated with heat exchanger 3, the liquid outlet end of heat exchanger 3 is communicated with water distribution head one 7, water inlet tank 1 contains wastewater containing nitrate (NO 3- ) in it, liquid level controller can be used to monitor liquid level in real time, wastewater is pumped into heat exchanger 5 by water inlet pump 2, the temperature of inlet water is changed by heat exchanger to be suitable for reaction, and finally enters reactor main body 4, wherein temperature controller can be used to monitor temperature in real time.
[0031] Liquid outlet backwash part is arranged in the outside of reactor main body 4, including water outlet pump 15, backwash pump 16 and water outlet tank 17, the liquid inlet end of water outlet pump 15 is communicated with MBR membrane assembly 12, the liquid outlet end is communicated with water outlet tank 17, the liquid inlet end of backwash pump 16 is communicated with water outlet tank 17, and the liquid outlet end is connected with water distribution head three 13 arranged in MBR membrane assembly 12, when liquid outlet, treated wastewater is pumped by negative pressure of water outlet pump 15 through MBR membrane assembly 12 to obtain filtrate and enter water outlet tank 17, and when backwash, liquid in water outlet tank 17 is pumped by backwash pump 16, water flow washes MBR membrane assembly 12 surface through water distribution head three 13, so that strong water flow disturbance is formed on MBR membrane assembly 12 surface, biological sulfur powder 5 and denitrifying bacteria are reduced to reduce membrane pollution, and MBR membrane assembly 12 can continuously and efficiently work, and meanwhile, water distribution head three 13 is arranged in independent membrane separation zone, when the membrane surface is washed by water force, the work of sedimentation zone is not affected.
[0032] As an embodiment of the utility model, the upper end of reactor main body 4 is fixedly connected with sealing cover 10, the top of sealing cover 10 is provided with exhaust pipe, and the closed space is formed by using sealing cover 10 to maintain anaerobic environment of reactor device, and exhaust can be carried out through exhaust pipe when necessary.
[0033] As an embodiment of the utility model, the lower end and the upper end of one side of reactor main body 4 are fixedly provided with vent valve 19 and overflow pipe 20 respectively, the outside of reactor main body 4 is provided with two online thermometers 18, the two online thermometers 18 are used to monitor temperature in reaction zone, vent valve 19 and overflow pipe 20 are used to empty liquid in reactor main body 4 and prevent too much liquid respectively, and online thermometer 18 is used to monitor reaction temperature in real time.
[0034] Working principle: when using, wastewater is connected into flow guide cylinder 6 by water distribution head one 7 through liquid inlet part, water flow flows from bottom to top, wastewater is uniformly sprayed on biological sulfur powder 5 and denitrifying bacteria, biological sulfur powder 5 and denitrifying bacteria flow to sedimentation zone at high speed, nitrate (NO 3- ) and nitrite (NO 2-) In the action of denitrifying bacteria and biological sulfur powder 5, sulfur autotrophic denitrification is carried out thoroughly, so that nitrate (NO 3- ) and nitrite (NO 2- ) in the wastewater are rapidly converted into nitrogen (N2) ;
[0035] The settling zone is designed as a variable-diameter cylinder with a wide upper part and a narrow lower part, which facilitates the settlement of biological sulfur powder and reduces the pollution of the MBR membrane assembly 12. The internal circulation is achieved through the internal circulation part. With the accumulation of wastewater in the reaction zone, the biologically denitrified wastewater overflows into the membrane biological reaction zone, i.e., the area where the MBR membrane assembly 12 is located. The partition 11 is arranged outside the MBR membrane assembly 12 to separate the settling zone and the MBR membrane assembly 12. The intercepting wire mesh 14 is arranged to keep the lower water flow in a flowing state. After the wastewater enters, the organic matter in the wastewater is further removed under the membrane biological conversion effect. In addition, the membrane surface can be scoured by the reverse washing pump 16, so that a strong water flow disturbance is formed on the membrane surface, the attachment of biological sulfur powder and denitrifying bacteria is reduced, and the membrane pollution is reduced. The reverse washing pump 16 is used to replace the traditional MBR process air blower aeration to maintain an anaerobic environment. Finally, the treated wastewater is pumped by the negative pressure of the effluent pump 15, passes through the MBR membrane assembly 12 to obtain the filtrate, and enters the effluent tank 17.
[0036] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage of the present application.
Claims
1. A sulfur autotrophic denitrification MBR membrane treatment apparatus capable of trapping biological sulfur, comprising a reactor main body (4), characterized in that: The inside of the reactor body (4) has a sedimentation zone and a reaction zone arranged vertically for containing biological sulfur powder (5) and denitrifying bacteria, wherein the sedimentation zone is a variable diameter straight cylinder with a wide upper part and a narrow lower part; The inside of the reaction zone is fixedly provided with a flow guide cylinder (6), and the inside of the flow guide cylinder (6) is provided with a water distribution head (7) on the lower side; An MBR membrane assembly (12) is fixedly arranged above one side of the sedimentation zone, the outer side of the MBR membrane assembly (12) is provided with a partition (11), and the lower side of the partition (11) is fixedly connected with an intercepting screen (14) at an angle; It also comprises an internal circulation part, which comprises a circulating pump (9) arranged on the outer side of the reactor body (4), wherein the liquid inlet end of the circulating pump (9) is communicated with the upper side of the reaction zone through a pipeline, and the liquid outlet end is communicated with a water distribution head (8) located below the water distribution head (7).
2. A sulfur autotrophic denitrification MBR membrane treatment apparatus capable of trapping biological sulfur according to claim 1, characterized in that: It also comprises an inlet part and an outlet backwashing part, wherein the inlet part is used to pass wastewater into the reactor body (4), and the outlet backwashing part is used for outlet and backwashing.
3. A sulphur autotrophic denitrification MBR membrane treatment apparatus capable of trapping biological sulphur according to claim 2, characterized in that: The inlet part is arranged outside the water inlet tank (1) and comprises the water inlet tank (1), a water inlet pump (2) and a heat exchanger (3), wherein the liquid inlet end of the water inlet pump (2) is communicated with the water inlet tank (1), the liquid outlet end is communicated with the heat exchanger (3), and the liquid outlet end of the heat exchanger (3) is communicated with the water distribution head (7).
4. A sulfur autotrophic denitrification MBR membrane treatment apparatus capable of trapping biological sulfur according to claim 2, characterized in that: The outlet backwashing part is arranged outside the reactor body (4) and comprises a water outlet pump (15), a backwashing pump (16) and a water outlet tank (17), wherein the liquid inlet end of the water outlet pump (15) is communicated with the MBR membrane assembly (12), the liquid outlet end is communicated with the water outlet tank (17), the liquid inlet end of the backwashing pump (16) is communicated with the water outlet tank (17), and the liquid outlet end is connected with a water distribution head (13) arranged beside the MBR membrane assembly (12).
5. A sulfur autotrophic denitrification MBR membrane treatment apparatus capable of trapping biological sulfur according to claim 1, characterized in that: The upper end of the reactor body (4) is fixedly connected with a sealing cover (10), and the top of the sealing cover (10) is provided with an exhaust pipe.
6. A sulphur autotrophic denitrification MBR membrane treatment apparatus capable of trapping biological sulphur according to claim 5, characterized in that: The lower end and the upper end of one side of the reactor body (4) are fixedly provided with a vent valve (19) and an overflow pipe (20), respectively, and the outer side of the reactor body (4) is provided with two online thermometers (18), which are used to monitor the temperature in the reaction zone.