CN112142184B - Electric heating flat membrane filtration assembly for water treatment and preparation method thereof - Google Patents
Electric heating flat membrane filtration assembly for water treatment and preparation method thereof Download PDFInfo
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- CN112142184B CN112142184B CN202010930463.3A CN202010930463A CN112142184B CN 112142184 B CN112142184 B CN 112142184B CN 202010930463 A CN202010930463 A CN 202010930463A CN 112142184 B CN112142184 B CN 112142184B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/10—Temperature conditions for biological treatment
Abstract
The invention belongs to the technical field of water treatment, and relates to an electric heating flat membrane filtration assembly for water treatment and a preparation method thereof. The invention relates to an electric heating membrane filtering component, which comprises a heating material, a conductive wire, an insulating layer and a supporting net; the heating material is wound into a bulk shape with two ends, and the two ends are connected with the conductive wire; the insulating layer is made of insulating materials and wraps the heating materials to form a complete electric heating wire; the supporting net is a net structure with plane or partial spherical characteristics, and the electric heating wire is uniformly loaded on the net structure to form a film frame; the surface of the micro-filtration membrane is connected with a temperature sensor and is fixedly connected with the membrane frame to form the electric heating membrane filtration component. The invention also provides a preparation method of the electric heating membrane filtering assembly, the change of membrane performance caused by low temperature can be obviously improved by increasing the membrane surface temperature, the membrane flux is increased, and the membrane pollution is better slowed down.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to an electric heating flat membrane filtration assembly for water treatment and a preparation method thereof.
Background
The Membrane Bioreactor (MBR) technology used in the field of water treatment combines the traditional activated sludge process with the membrane separation technology, and retains the activated sludge in the reactor through the high-efficiency separation of the membrane, so that the effluent quality is improved compared with the traditional activated sludge method. The method has the advantages of small occupied area, high volume load, low excess sludge yield, good effluent quality and the like, so that the MBR process has wide application prospect in the aspects of sewage treatment and reuse. However, in the actual operation process of the MBR, the ambient temperature and the water temperature change with the change of the operating season along with the change of the season, and the change range of the water temperature can reach about 20 ℃, which has an important influence on the operation efficiency of the MBR. On one hand, the water temperature can influence dynamic indexes such as viscosity of the activated sludge, so that the membrane pollution change is influenced; on the other hand, the water temperature can influence the sludge activity, and researches show that the effect of the water temperature on the removal of organic matters by the MBR is not remarkably influenced, but the nitration reaction can be inhibited when the water temperature is less than 12 ℃; in addition, studies have shown that extreme cold water temperatures can cause membrane pore size reduction, resulting in reduced membrane permeability and reduced membrane flux. In conclusion, the low temperature adversely affects the membrane surface structure and microbial activity, and also affects the viscosity of the sludge mixed liquor and various dynamic characteristics of the reactor, thereby affecting the removal effect of pollutants, and finally causing the reduction of membrane flux and the reduction of membrane life.
In order to solve the problem of low-temperature operation of the MBR, the water temperature can be raised by adopting a heating means, so that the microbial activity can be recovered, and the problems of poor membrane permeability, changed pore size structure and the like caused by low temperature can be solved. Researches show that the membrane surface temperature is maintained at 30-35 ℃ by periodically heating, the problems of permeability deterioration, pore size structure change and the like of the membrane can be repaired, a new thought is provided for solving the problem of low-temperature operation of MBR in winter, and the development of an electric heating membrane filtering component has very important significance.
Disclosure of Invention
The invention aims to provide an electric heating membrane filtering assembly to relieve the problem of aggravation of MBR membrane pollution caused under the condition of low-temperature operation.
The conception of the invention is as follows: the electric heating technology is a very widely used heat energy providing means at present, and the existing electric heating technology mostly adopts heating elements of metal resistance wires and other conducting wires, such as metal resistance wires, carbon fiber heating cables and the like adopted by the existing electric floor heating, electric blankets and the like, and also utilizes a heating film. The heating film is mainly composed of conductive substances and film-forming substances or film-shaped materials, and different conductive substances and film-forming matrixes can form a plurality of electrothermal films. The electrothermal film researched in the past is mainly used as a material in the fields of household heating, industrial and agricultural heat preservation protection and the like, and is different from an electric heating filtering membrane component applied to the technical field of water treatment. The invention firstly applies the electric heating technology to the technical field of MBR water treatment, combines the heating technology with the membrane filtration technology, develops a preparation method of the electric heating membrane filtration assembly, improves the membrane performance through heating, reduces the membrane resistance, simultaneously increases the temperature of water in a certain range of a membrane interface under the heat transfer action, reduces the viscosity of filtrate, slows down the membrane pollution speed, relieves the membrane pollution problem under the low-temperature operation of the traditional filter membrane, and is an original and innovative anti-pollution membrane assembly. The present invention has been completed based on the above-mentioned studies.
In order to solve the problem of aggravation of MBR membrane pollution caused under the condition of low-temperature operation, the invention provides an electric heating membrane filtering assembly. The electric heating membrane filtering component comprises a heating material, a conductive wire, an insulating layer and a supporting net.
The heating material is wound into a bulk shape with two ends, and the two ends are connected with the conductive wire;
the insulating layer is made of insulating materials and wraps the heating materials to form a complete electric heating wire;
the supporting net is a net structure with plane or partial spherical characteristics, and the electric heating wire is uniformly loaded on the net structure to form a film frame;
the surface of the micro-filtration membrane is connected with a temperature sensor and is fixedly connected with the membrane frame to form the electric heating membrane filtration component.
The heating material is a material capable of being electrified and heated, and the adopted material comprises a carbon nanofiber material, a metal resistance wire and graphene.
Preferably, the heating material has good heating and conducting effects in a water body.
Preferably, the diameter of the dough is 0.5-2 mm.
The thickness and the length of the heating material are coordinated, the heating material is uniformly laid on the supporting net, and the thickness difference of the heating material laid on the supporting net is less than 2 mm; when the voltage transformation power supply is switched on, the heating temperature of the heating material is 30-40 ℃.
The insulating plastic protective layer has an insulating function and can be made of a plastic material, such as a PET or PP plastic film.
The invention also provides a preparation method for the electric heating membrane filtering assembly, which comprises the following steps:
S1: winding the heating material into a dough, connecting two ends of the heating material with conductive wires, adjusting the thickness and the length of the heating material, and ensuring that the heating temperature is 30-40 ℃ when a variable voltage power supply is switched on;
S2: will step S1Coating an insulating protective layer outside the obtained heating material to prepare a complete electric heating wire;
S3: will step S2The obtained electric heating wires are uniformly loaded on a support net of the flat membrane filtration component;
S4: the surface of the traditional microfiltration membrane is connected with a temperature sensor and is stuck in the step S3And (3) preparing an electric heating flat membrane filtration module on the obtained membrane frame.
Preferably, step S1The heating material comprises one or more of a carbon nanofiber material, a metal resistance wire and graphene.
Preferably, step S1The variable voltage power supply has stable power supply output, has better conductivity in a water body, and has no any safety risk to a human body.
Preferably, step S2The insulating plastic protective layer is one of PET or PP plastic film, and the insulating material film thickness is suitable.
PET refers to polyethylene terephthalate materials, and has good mechanical properties, excellent heat resistance and oil resistance and very high chemical stability.
PP is a polypropylene material, is one of the lightest plastics, and has outstanding rigidity, good stress relaxation resistance and good heat resistance.
Preferably, step S3The electric heating wires are loaded on the membrane frame supporting net, and are required to uniformly and orderly cover the membrane surface, so that the heating uniformity is ensured.
Preferably, step S4When the surface temperature of the film reaches or is higher than 35 ℃, the temperature sensor can be set according to the temperature, so that the high-temperature automatic power-off is realized, and the heating is stopped.
Specifically, when the applied voltage is 12V, the heating material is wound into a bulk shape with the diameter of 0.5-2mm, the outer diameter of the insulating plastic protective layer is 1-3mm, the thickness of the insulating material film is 0.11-0.13mm, the temperature of the reactor solution is 20-25 ℃, the volume of the reactor is 1L, and the operation mode is sequencing batch.
Better, when the operation mode is sequencing batch, the change of the membrane performance caused by low temperature can be obviously improved by increasing the temperature of the membrane surface, the membrane flux is increased, and the membrane pollution is better slowed down.
The invention provides a preparation method of an electric heating flat membrane filtering component for water treatment under low-temperature operation conditions, which comprises a matching component, wherein the matching component comprises a temperature sensor arranged on the surface of a membrane, the sensor is simultaneously connected with a heating material, automatic heating and power-off can be realized when the temperature of the membrane surface exceeds 35 ℃, the heating material refers to a nano carbon fiber material, a metal resistance wire, graphene and the like, the heating material is loaded on a membrane supporting net, and the membrane material is heated by the generated heat through electric heat discharge of the heating material, so that the problem of membrane performance reduction caused by low temperature is solved, and the preparation method is convenient and rapid. When a Membrane Bioreactor (MBR) operates at low temperature in winter, the membrane performance of the electric heating membrane filtering component is improved through heating, the membrane resistance is reduced, the water temperature of a membrane interface in a certain range is increased through the heat transfer effect, the viscosity of filtrate is reduced, the membrane pollution speed is reduced, the membrane pollution problem of the traditional filter membrane in the low-temperature operation is relieved, the membrane cleaning period is prolonged, the technical operation stability is improved, and the anti-pollution membrane component is an original and innovative anti-pollution membrane component.
Drawings
FIG. 1 is a schematic view of the preparation of an anti-fouling membrane module.
Detailed Description
In order to illustrate the technical solution of the present invention, the following detailed description is made with reference to the embodiments.
Example 1
As shown in fig. 1, the present application provides an electrically heated flat sheet membrane filtration module for water treatment under cryogenic operating conditions. The electric heating flat membrane filtering component comprises a matching component, wherein the matching component comprises a temperature sensor arranged on the surface of a membrane, the sensor is simultaneously connected with a heating material, when the temperature of the membrane surface exceeds 35 ℃, automatic heating power-off can be realized, and a metal resistance wire is loaded on a membrane supporting net.
Winding the heating material into a ball shape, connecting two ends with the conductive wires, adjusting the thickness and length of the heating material, and ensuring that the heating temperature is 30-40 ℃ when a variable voltage power supply is switched on. And coating an insulating plastic protective layer outside the heating material to prepare a complete electric heating wire, wherein the electric heating wire is uniformly loaded on a support net of the flat membrane filtration component. The surface of a traditional microfiltration membrane is connected with a temperature sensor and is stuck on a membrane frame loaded with an electric heating wire to prepare the electric heating flat membrane filtration component.
When the film is used, the film material is heated by the generated heat through the electric heat discharge of the heating material, the problem of the performance reduction of the film caused by low temperature is solved, and the film is convenient and quick.
Example 2
This embodiment is different from embodiment 1 in that graphene is used as a heating material.
The preparation method comprises the following steps:
winding the graphene into a bulk shape with the diameter of 0.9-1.0mm, connecting two ends of the graphene with a conductive wire, adjusting the thickness and the length of a heating material, and ensuring that the heating temperature is 30-40 ℃ when a variable voltage power supply is switched on.
And (3) coating a layer of insulating PET protective layer outside the obtained heating material, wherein the outer diameter of the PET layer is 2.5mm, and the thickness of the insulating film is 0.12mm, and preparing the complete electric heating wire.
The electric heating wire obtained above was uniformly supported on the support mesh of the flat membrane filtration module.
And connecting a temperature sensor on the surface of the traditional microfiltration membrane, and sticking the traditional microfiltration membrane on the membrane frame to prepare the electric heating flat membrane filtration component.
Example 3
This example is different from example 2 in that when graphene is wound into a dough shape, and wound into a dough shape having a diameter of 0.9 to 1.0mm, the graphene wires are overlapped while being crossed, and the subsequent steps are performed to form an electrically heated flat membrane filtration module according to the method of example 2. The membrane is placed in the MBR, the membrane is burnt to be yellow after electrification, the heating wire is short-circuited, the temperature is too high after electrification, and the membrane is burnt and damaged.
Example 4
This example is different from example 2 in that the electric heating wire obtained as described above was uniformly supported on the support mesh of the flat membrane filtration module, and the electric heating wire was not uniformly laid, and the subsequent step was carried out to manufacture the electric heating flat membrane filtration module according to the method of example 2. The membrane is placed in an MBR, the surface of the membrane is heated unevenly after being electrified, compared with a membrane module without an electric heating wire, the rising speed of TMP of the MBR is not slowed down, the membrane pollution speed is very high under the low-temperature condition, the effluent quality is poor, and the COD, the total nitrogen and the ammonia nitrogen concentration do not meet the requirements of the national first-level A standard.
Example 5
This embodiment is different from embodiment 1 in that a filamentous nanocarbon is used as a heating material. An electrically heated flat sheet membrane filtration module was prepared according to the procedure of example 1, meeting the predetermined requirements.
Example 6
The SBR-MBR for treating rural domestic sewage serving 2 families operates in winter, and the nano carbon fiber electric heating membrane filtering component provided by the invention is adopted, the treatment scale of which is 0.5m3D, effective volume of 0.6m3The membrane module water outlet pump is a self-sucking pump, the water inlet pump is a peristaltic pump, and the aeration machine is used for aeration. When the water temperature reaches 15 ℃ in winter, the nano carbon fiber electric heating membrane filtering component is adopted, the power supply is connected, and then the operation is startedAnd (5) normally running.
After the membrane module of the device is replaced by a carbon nanofiber electric heating membrane filtering module, when the concentration of COD, total nitrogen, ammonia nitrogen and total phosphorus of inlet water is 384, 44, 37 and 4.5mg/L respectively, the concentration of total phosphorus of outlet water of the device is 1.81 +/-0.53 mg/L, the concentration of COD, total nitrogen and ammonia nitrogen all meet the requirement of national first-level A standard, the rising speed of TMP is reduced, and the membrane cleaning period is prolonged for five days.
As those skilled in the art will appreciate, the present invention may be embodied in many other specific forms without departing from the spirit or scope thereof. Although embodiments of the present invention have been described, it is to be understood that the present invention should not be limited to those embodiments but various changes and modifications can be made by one skilled in the art within the spirit and scope of the present invention as hereinafter claimed.
Claims (9)
1. A method for making an electrically heated membrane filtration module comprising the steps of:
s1: winding the heating material into a dough, connecting two ends of the heating material with conductive wires, adjusting the thickness and the length of the heating material, and ensuring that the heating temperature is 30-40 ℃ when a variable voltage power supply is switched on;
s2: wrapping a layer of insulating protective layer outside the heating material obtained in the step S1 to prepare a complete electric heating wire;
s3: uniformly loading the electric heating wire obtained in the step S2 on a support net of the flat membrane filtration assembly; the electric heating wires are required to uniformly and orderly cover the film surface, so that the heating uniformity is ensured;
s4: the surface of the traditional microfiltration membrane is connected with a temperature sensor and is stuck on the membrane frame obtained in the step S3 to prepare the electric heating flat membrane filtration component.
2. The method for preparing an electrically heated membrane filter assembly as claimed in claim 1, wherein the heating material of step S1 includes one or more of carbon nanofiber material, metal resistance wire, and graphene.
3. The method for preparing an electrically heated membrane filter assembly according to claim 1, wherein the insulating protective layer of step S2 is a PET or PP plastic film, and the insulating material film has a suitable thickness.
4. The method of claim 1, wherein the temperature sensor of step S4 is set according to the temperature, and when the temperature of the membrane surface reaches or exceeds 35 ℃, the temperature sensor automatically cuts off the power supply to stop heating.
5. The method of manufacturing an electrically heated membrane filter assembly according to claim 1, wherein the heating material is wound in a lump shape having a diameter of 0.5 to 2mm when the applied voltage is 12V, the outer diameter of the insulating plastic protective layer is 1 to 3mm, the thickness of the insulating material film is 0.11 to 0.13mm, the temperature of the reactor solution is 20 to 25 ℃, the volume of the reactor is 1L, and the operation mode is a sequential batch type.
6. An electric heating membrane filtering component is characterized by comprising a heating material, conductive wires, an insulating layer and a supporting net;
the heating material is wound into a bulk shape with two ends, and the two ends are connected with the conductive wire;
the insulating layer is made of insulating materials and wraps the heating materials to form a complete electric heating wire;
the supporting net is a net structure with plane or partial spherical characteristics, and the electric heating wire is uniformly loaded on the net structure to form a film frame;
the surface of the micro-filtration membrane is connected with a temperature sensor and is fixedly connected with the membrane frame to form the electric heating membrane filtration component.
7. An electrically heated membrane filtration module according to claim 6, wherein the heating material is an electrically energisable and heatable material, and the diameter of the mass is 0.5-2 mm.
8. An electrically heated membrane filtration module according to claim 6 wherein the heating material is of a uniform thickness and length and is uniformly applied to the support web;
when the voltage transformation power supply is switched on, the heating temperature of the heating material is 30-40 ℃.
9. The application of the electric heating membrane filtration module according to claim 6, wherein the electric heating membrane filtration module is used for preparing a membrane bioreactor in the field of water treatment, the membrane performance reduction caused by low temperature is improved by increasing the membrane surface temperature, the membrane flux is increased, and the membrane pollution is better reduced.
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| CN202010930463.3A CN112142184B (en) | 2020-09-07 | 2020-09-07 | Electric heating flat membrane filtration assembly for water treatment and preparation method thereof |
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| CN202010930463.3A CN112142184B (en) | 2020-09-07 | 2020-09-07 | Electric heating flat membrane filtration assembly for water treatment and preparation method thereof |
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| CN112142184B true CN112142184B (en) | 2022-01-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201785218U (en) * | 2010-07-15 | 2011-04-06 | 威海怡和专用设备制造股份有限公司 | Membrane module heating device for water treatment |
| CN104289114A (en) * | 2014-09-10 | 2015-01-21 | 同济大学 | Conductive filter membrane and application thereof |
| CN205295073U (en) * | 2015-12-07 | 2016-06-08 | 北京城市排水集团有限责任公司 | Portable MBR technology sewage treatment plant |
| CN209383482U (en) * | 2018-12-26 | 2019-09-13 | 无锡博美环境科技有限公司 | A kind of thermal-insulating type integration MBR device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008207150A (en) * | 2007-02-28 | 2008-09-11 | Toray Ind Inc | Flat membrane element and fermentation tank |
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- 2020-09-07 CN CN202010930463.3A patent/CN112142184B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201785218U (en) * | 2010-07-15 | 2011-04-06 | 威海怡和专用设备制造股份有限公司 | Membrane module heating device for water treatment |
| CN104289114A (en) * | 2014-09-10 | 2015-01-21 | 同济大学 | Conductive filter membrane and application thereof |
| CN205295073U (en) * | 2015-12-07 | 2016-06-08 | 北京城市排水集团有限责任公司 | Portable MBR technology sewage treatment plant |
| CN209383482U (en) * | 2018-12-26 | 2019-09-13 | 无锡博美环境科技有限公司 | A kind of thermal-insulating type integration MBR device |
Non-Patent Citations (1)
| Title |
|---|
| Pervaporation of high boilers using heated membranes;K.W.Boddeker;《Desalination》;19931231;第90卷;第249-257页 * |
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