CN220766780U - Double-sided flat plate membrane for anaerobic digestion of sludge and dynamic membrane assembly - Google Patents
Double-sided flat plate membrane for anaerobic digestion of sludge and dynamic membrane assembly Download PDFInfo
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- CN220766780U CN220766780U CN202322378877.1U CN202322378877U CN220766780U CN 220766780 U CN220766780 U CN 220766780U CN 202322378877 U CN202322378877 U CN 202322378877U CN 220766780 U CN220766780 U CN 220766780U
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- 239000012528 membrane Substances 0.000 title claims abstract description 176
- 239000010802 sludge Substances 0.000 title claims abstract description 53
- 230000029087 digestion Effects 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 abstract description 10
- 239000011148 porous material Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000000306 component Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 10
- 229920000915 polyvinyl chloride Polymers 0.000 description 10
- 239000004800 polyvinyl chloride Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000004907 flux Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
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- 239000004952 Polyamide Substances 0.000 description 2
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- 229920004933 Terylene® Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001079 digestive effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
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- 230000002411 adverse Effects 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
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Abstract
The utility model discloses a double-sided flat membrane for anaerobic digestion of sludge and a dynamic membrane assembly, which adopt a hard PVC grid as an inner supporting framework of a membrane framework, an outer supporting layer is adopted to be sealed and attached to two sides of the inner supporting framework along the periphery of the membrane framework, and a pore canal communicated with the inside of the membrane framework is arranged at one side of the membrane framework and used as a membrane water outlet; the double-sided flat membrane provided by the utility model is low in preparation cost, frequent cleaning or replacement is not needed, the required operation cost is low, the AnDMBR sludge anaerobic digestion system can stably operate for a long time under high sludge concentration, and the efficiency of the reactor is improved.
Description
Technical Field
The utility model belongs to the technical field of anaerobic sludge digestion, and relates to a double-sided flat membrane and a dynamic membrane component for anaerobic sludge digestion.
Background
The anaerobic dynamic membrane bioreactor (AnDMBR) is a water treatment technology combining a membrane separation technology and an activated sludge process, and can achieve the improvement of the operation concentration by decoupling hydraulic retention time HRT and solid retention time SRT when the anaerobic dynamic membrane bioreactor is applied to anaerobic sludge digestion, but long-term high-sludge-concentration operation tends to make a dynamic membrane too thick, so that the membrane surface is formed to be connected with a mud cake, thereby causing the membrane pressure to be too high or the membrane flux to be too low, reducing the operation efficiency of the dynamic membrane and even being incapable of continuing to be applied, and therefore, the dynamic membrane assembly needs to be cleaned or replaced.
In the conventional AnDMBR process, the dynamic membrane component is a core component of an anaerobic dynamic membrane bioreactor, and mainly adopts PVC, stainless steel and the like as supporting frameworks, adopts polyamide, polypropylene and the like as outer supporting layer materials, is generally in a flat plate type or tubular type configuration, has the pore diameter range of the supporting layer of most 10-200 mu m, is mainly in immersed operation, and also adopts a lateral flow type filtration mode in a small amount; however, the membrane component is mostly used in sewage treatment, and the treatment object is wastewater with low viscosity and low concentration, but in the anaerobic sludge digestion process, as the treatment object is sludge with high concentration and high viscosity, the conventional supporting layer materials such as polyamide, polypropylene and the like are easy to cause membrane pollution, so that sludge particles are deposited on the membrane surface to form a connected mud cake, further the transmembrane pressure difference is rapidly increased, long-term stable operation of the reactor is not facilitated, in addition, the membrane component is required to be frequently replaced or cleaned, and the economic practicability of the process in anaerobic sludge digestion is weakened due to the high price of the membrane material; therefore, when the high-concentration and high-viscosity sludge is digested, the existing membrane component severely limits the formation of a dynamic membrane layer and has adverse effects on the long-term stable operation of the anaerobic dynamic membrane bioreactor, so that the key problem to be solved in the current sludge digestion process is still needed to be solved for how to design the structure of the dynamic membrane component and what materials are adopted to manufacture the membrane component.
In view of the above, in order to reduce the frequency of cleaning or replacement of the membrane module, a new flat membrane module needs to be designed, which is beneficial to the formation of a dynamic membrane layer while reducing the cost, and realizes the long-term stable operation of the reactor.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a double-sided flat membrane and a dynamic membrane assembly for anaerobic digestion of sludge, wherein a hard PVC grid is adopted as an inner supporting framework of the membrane assembly, an outer supporting layer is adopted to be sealed and attached to two sides of the inner supporting framework along the periphery of the membrane framework, and a pore canal communicated with the inside of the membrane framework is arranged at one side of the membrane framework to serve as a membrane water outlet; the double-sided flat membrane is low in preparation cost, frequent cleaning or replacement is not needed, the required operation cost is low, the rapid formation of a dynamic membrane layer is facilitated, the AnDMBR sludge anaerobic digestion system is enabled to stably operate for a long time under high sludge concentration, and the efficiency of the reactor is improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a double-sided flat plate membrane for anaerobic digestion of sludge, which comprises a membrane framework and PVC (polyvinyl chloride) grids arranged in the membrane framework, wherein the membrane framework is a hollow frame body, one side of the membrane framework is provided with a membrane water outlet hole communicated with the inside of the membrane framework, and the PVC grids are fixed in the frame body of the membrane framework; the membrane is symmetrically arranged on two sides of the membrane framework;
the membrane is sealed on the membrane framework along the periphery of the membrane framework.
Preferably, the membrane adopts one of a stainless steel wire net, a nylon net and a polyester net.
Preferably, the membrane has a mesh size of 30 to 80 μm.
A second aspect of the utility model provides a dynamic membrane module for anaerobic digestion of sludge comprising a membrane frame; a plurality of double-sided flat-plate films according to the first aspect of the utility model are arranged in the film component in parallel and equidistantly.
Preferably, the distance between the two-sided flat films is 10-15 cm.
The double-sided flat membrane and the dynamic membrane component for anaerobic sludge digestion provided by the utility model have the following beneficial effects:
1. the utility model relates to a double-sided flat membrane for anaerobic digestion of sludge and a dynamic membrane assembly, which adopt a hard PVC grid as an inner supporting framework of a membrane framework, an outer supporting layer is adopted to be sealed and attached to two sides of the inner supporting framework along the periphery of the membrane framework, and a pore canal communicated with the inner part of the membrane framework is arranged at one side of the membrane framework and used as a membrane water outlet; the double-sided flat membrane is low in preparation cost, frequent cleaning or replacement is not needed, the required operation cost is low, the AnDMBR sludge anaerobic digestion system can stably operate for a long time under high sludge concentration, and the efficiency of the reactor is improved;
2. according to the double-sided flat membrane and the dynamic membrane component for anaerobic digestion of sludge, the PVC grid is adopted as the internal supporting framework of the membrane framework, and the cheap macroporous substrate is adopted as the supporting layer, so that frequent cleaning or replacement of the membrane component can be avoided, the stable operation of an AnDMBR system is maintained, the cost is low, the manufacturing is simple, the use is convenient, and the popularization is realized;
3. the utility model adopts the thought of a double-sided flat membrane with a seemingly simple structure, and the dynamic membrane component is formed by a plurality of flat membranes with the same structure, the price of the used preparation materials is very low, the dynamic membrane layer is fixedly formed on the surface of the dynamic membrane layer and keeps stable operation, and the mud cake layer can be peeled off and the membrane flux can be recovered only by simple physical cleaning, so that the AnDMBR system can stably operate for more than 50 days.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a double-sided flat sheet membrane for anaerobic digestion of sludge according to the present utility model;
FIG. 2 is an exploded view of a double-sided flat panel membrane for anaerobic digestion of sludge according to the present utility model;
FIG. 3 is a schematic diagram of the dynamic membrane formation on the surface of a double-sided flat membrane for anaerobic digestion of sludge according to the present utility model.
Detailed Description
In order to better understand the above technical solution of the present utility model, the technical solution of the present utility model is further described below with reference to examples.
Referring to fig. 1 and 2, the utility model provides a double-sided flat membrane for anaerobic digestion of sludge, which comprises a membrane framework 11 and a PVC grid 13 arranged inside the membrane framework 11; the membrane skeleton 11 is a hollow frame body, one side of the frame body is provided with a membrane water outlet 14 communicated with the inside of the membrane skeleton 11, and the membrane water outlet 14 is used for discharging liquid (membrane water such as sludge digestion liquid or clear liquid) in the double-sided flat membrane 10; the PVC grid 13 is used as an internal supporting framework of the double-sided flat plate membrane 10 and is fixed in a frame body of the membrane framework 11; the double-sided flat membrane also comprises membranes symmetrically arranged at two sides of the membrane framework 11; the membrane is sealed on the membrane frame 11 along the periphery of the membrane frame 11, and uses a large Kong Lianjia base material as a supporting material, such as a stainless steel wire mesh, a nylon mesh or a terylene mesh, and the mesh diameter of the membrane is 30-80 mu m. The pipeline that the membrane apopore 14 on the membrane skeleton 11 communicates can link to each other with peristaltic pump, in the anaerobic digestion process of mud, form the negative pressure in the internal cavity of two-sided flat membrane 10 through the suction effect of peristaltic pump, make mud digestive juice remove to the diaphragm, thus make living beings adsorb and fix on its surface, form dense dynamic membrane layer 15 gradually (see fig. 3), produce the closure effect similar to traditional filter membrane, play the effect of two-sided filtration, liquid then flows out the inner chamber through the membrane apopore 14, discharge the membrane district through the passageway that the pipeline connects on two-sided flat membrane 10, can obtain the mud digestive juice of lower concentration when operating under lower transmembrane pressure difference, operate under higher transmembrane pressure difference, can obtain clear membrane effluent.
The membranes used on two sides of the double-sided flat membrane 10 adopt low-cost macroporous substrates such as stainless steel wire mesh, nylon mesh, polyester mesh and the like as supporting materials, and compared with the membranes commonly used in the market (600-800 yuan per meter), the cost is lower.
The utility model also provides a dynamic membrane module for anaerobic digestion of sludge, comprising a membrane frame; a plurality of double-sided flat plate films 10 are arranged in the film assembly in parallel at equal intervals; wherein 6 to 8 double-sided flat films 10 are arranged, and the distance between the double-sided flat films 10 is 3 to 10cm.
When the dynamic membrane component for anaerobic digestion of sludge is used in an AnDMBR system with the sludge concentration in a membrane area of 30-60 g/L, when the membrane flux change range is 2-10 LMH and the system is operated under a lower transmembrane pressure difference (< 10 kPa), sludge digestion liquid with the concentration of less than 10g/L can be obtained, and when the system is operated under a higher transmembrane pressure difference (20-40 kPa), clear membrane effluent (turbidity <200 NTU) can be obtained. The dynamic membrane component can enable the system to continuously and stably run for more than 50 days, and flux can be recovered by simple physical cleaning for membrane pollution.
The following describes a double-sided flat membrane and dynamic membrane module for anaerobic sludge digestion according to the present utility model with reference to specific examples.
Example 1
The embodiment adopts the double-sided flat membrane and the dynamic membrane component for anaerobic digestion of sludge to concentrate and separate the sludge after anaerobic digestion:
the sludge concentration in the AnDMBR main reaction zone is 36.5g/L, and the sludge concentration in the membrane zone is 43.3g/L. Adopting a hard PVC grid as an internal supporting framework, adopting a terylene net as a supporting material for the membrane, wherein the mesh diameter of the membrane is 39 mu m; the number of the double-sided flat films is 6, the length is 20cm, the width is 10cm, and the interval distance between the adjacent double-sided flat films is 10cm. The bottom of the film frame of the dynamic film is provided with a detachable air pipe, the number of the air pipes is 4, the air pipes are parallel to the arrangement direction of the double-sided flat film and are equidistantly arranged right below the double-sided flat film, and the circulating strength of the biogas is 30m 3 /(m 2 H) the gas outflow direction was 45℃away from the immediately lower side, and the pore diameter was 1cm. Under the conditions that the membrane flux is 4.7LMH and the transmembrane pressure difference is less than 10kPa, digested sludge liquid with the concentration of 7.5g/L can be obtained, and the AnDMBR system continuously and stably operates for more than 50 days without membrane cleaning.
Example 2
The embodiment adopts the double-sided flat membrane and the dynamic membrane component for anaerobic digestion of sludge to concentrate and separate the sludge after anaerobic digestion:
the same as in example 1 for the most part, with the difference that: the sludge concentration in the main reaction zone is 41.6g/L, the sludge concentration in the membrane zone is 51.0g/L, and the biogas circulating strength is 35m 3 /(m 2 And h) under the conditions that the membrane flux is 5.3LMH and the transmembrane pressure difference is more than 30kPa, clear membrane effluent with turbidity less than 200NTU can be obtained, and the AnDMBR system continuously and stably operates for more than 50 days without membrane cleaning.
In summary, the double-sided flat membrane and the dynamic membrane component for anaerobic digestion of sludge serve as core components of the anaerobic dynamic membrane bioreactor, so that frequent cleaning or replacement of the membrane component can be avoided, the dynamic membrane is favorably formed on the membrane component in an attached manner, and the stable operation of an AnDMBR process for anaerobic digestion of sludge is maintained; the method surrounds a core technology of a double-sided flat membrane, and simultaneously researches a plurality of membrane component related technologies (such as an AnDMBR dynamic membrane component based on electrode polarity conversion, a control method, a starting method of sludge anaerobic digestion AnDMBR dynamic membrane and an AnDMBR dynamic membrane component for relieving membrane pollution) and submits the technology on the same day, so that the problem of dynamic membrane of an anaerobic dynamic membrane bioreactor is solved, long-term stable operation of the reactor under high sludge concentration is ensured, and the efficiency of the reactor is improved.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the utility model, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the utility model as long as they fall within the true spirit of the utility model.
Claims (5)
1. The double-sided flat plate membrane for anaerobic digestion of sludge comprises a membrane framework and PVC grids arranged in the membrane framework, wherein the membrane framework is a hollow frame body, one side of the membrane framework is provided with a membrane water outlet communicated with the inside of the membrane framework, and the PVC grids are fixed in the frame body of the membrane framework; the membrane framework is characterized by also comprising membranes symmetrically arranged at two sides of the membrane framework;
the membrane is sealed on the membrane framework along the periphery of the membrane framework.
2. The double-sided flat sheet membrane for anaerobic sludge digestion according to claim 1, wherein the membrane sheet adopts one of a stainless steel wire mesh, a nylon mesh and a polyester mesh.
3. The double-sided flat plate membrane for anaerobic sludge digestion according to claim 2, wherein the mesh size of the membrane sheet is 30 to 80 μm.
4. A dynamic membrane module for anaerobic digestion of sludge comprising a membrane frame; a plurality of double-sided flat-plate films according to any one of claims 1 to 3 are arranged in the film component in parallel at equal intervals.
5. The dynamic membrane module for anaerobic sludge digestion as claimed in claim 4, wherein the interval between the double-sided flat plates is 10-15 cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322378877.1U CN220766780U (en) | 2023-09-01 | 2023-09-01 | Double-sided flat plate membrane for anaerobic digestion of sludge and dynamic membrane assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322378877.1U CN220766780U (en) | 2023-09-01 | 2023-09-01 | Double-sided flat plate membrane for anaerobic digestion of sludge and dynamic membrane assembly |
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| CN220766780U true CN220766780U (en) | 2024-04-12 |
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| CN202322378877.1U Active CN220766780U (en) | 2023-09-01 | 2023-09-01 | Double-sided flat plate membrane for anaerobic digestion of sludge and dynamic membrane assembly |
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| Country | Link |
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| CN (1) | CN220766780U (en) |
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- 2023-09-01 CN CN202322378877.1U patent/CN220766780U/en active Active
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