阅读说明：本技术 一种膜反应器的清洗装置及清洗方法 (Cleaning device and cleaning method of membrane reactor ) 是由 张晓磊 任佳瑶 刘强 于 2021-03-01 设计创作，主要内容包括：本发明公开了一种膜反应器的清洗装置及清洗方法,其特征在于：清洗方法包括如下步骤：S1：将膜组件置于反应池中,通过进水泵向反应池中进水,通过出水泵将反应池中的水经过膜组件输送到外部；S2：在出水泵与所述膜组件之间的水压大于或等于预定阈值时,通过出水泵将化学清洗剂经过膜组件反向输送到反应池中；S3：向反应池中照射紫外光,以使化学清洗剂在反应池中产生自由基,本发明与现有技术相比的优点在于：在原有水冲洗系统的基础上,又通过化学清洗剂对膜组件进行反冲洗,并通过紫外光使化学清洗剂产生强氧化性的自由基,以实现对膜组件上污染物质的降解,不仅清洗效果更好,而且清洗效率大大提升。(The invention discloses a cleaning device and a cleaning method of a membrane reactor, which are characterized in that: the cleaning method comprises the following steps: s1: the membrane module is arranged in a reaction tank, water is fed into the reaction tank through a water inlet pump, and the water in the reaction tank is conveyed to the outside through the membrane module through a water outlet pump; s2: when the water pressure between the water outlet pump and the membrane module is greater than or equal to a preset threshold value, the chemical cleaning agent is reversely conveyed into the reaction tank through the membrane module by the water outlet pump; s3: the invention irradiates ultraviolet light to the reaction tank to enable the chemical cleaning agent to generate free radicals in the reaction tank, and compared with the prior art, the invention has the advantages that: on original water washing system's basis, carry out the back flush through chemical cleaner to the membrane module again to make chemical cleaner produce the free radical of strong oxidizing property through ultraviolet ray, with the degradation of realization to pollutant on the membrane module, not only the cleaning performance is better, and cleaning efficiency promotes greatly moreover.)

1. The utility model provides a belt cleaning device of membrane reactor, includes reaction tank (1), intake pump (2) and goes out water pump (3), and membrane module (4) are arranged in reaction tank (1), the delivery port of intake pump (2) with reaction tank (1) intercommunication, the water inlet of going out water pump (3) with the delivery port intercommunication of membrane module (4), its characterized in that: still include solution tank (5) and ultraviolet light source (6), chemical cleaner is equipped with in solution tank (5), ultraviolet light source (6) fixed mounting in reaction tank (1), and it makes chemical cleaner produces the free radical under its irradiation, go out water pump (3) with when water pressure between membrane module (4) is less than predetermined threshold value, the delivery port and the outside intercommunication of going out water pump (3), just go out water pump (3) forward transport, go out water pump (3) with when water pressure between membrane module (4) is greater than or equal to predetermined threshold value, the delivery port of going out water pump (3) with the water inlet intercommunication of solution tank (5), just go out water pump (3) reverse transport.

2. The cleaning apparatus of a membrane reactor of claim 1, wherein: the chemical cleaning agent is hypochlorite solution.

3. The cleaning apparatus of a membrane reactor of claim 1, wherein: the predetermined threshold is 50 KPa.

4. The cleaning apparatus of a membrane reactor of claim 1, wherein: the device is characterized by further comprising an air pump (7) and an aeration stone (8), wherein the aeration stone (8) is fixedly arranged at the bottom of the reaction tank (1), and an air inlet of the aeration stone is communicated with an air outlet of the air pump (7).

5. The cleaning apparatus of a membrane reactor of claim 1, wherein: the device is characterized by further comprising a liquid level controller (9), a pressure sensor (10) and a digital recorder (11), wherein the liquid level controller (9) is fixedly installed on the reaction tank (1), the detection end of the liquid level controller is located in the reaction tank (1), the liquid level controller (9) is electrically connected with the water inlet pump (2), when the water pressure between the water outlet pump (3) and the membrane assembly (4) is smaller than a preset threshold value, the detection end of the pressure sensor (10) is installed between the water outlet pump (3) and the membrane assembly (4) in a communicated mode, and the detection end is electrically connected with the digital recorder (11).

6. The cleaning apparatus of a membrane reactor of claim 1, wherein: the outer end face of the reaction tank (1) is wrapped with a light shielding film.

7. A method for cleaning a membrane reactor, comprising the steps of:

s1: the membrane module (4) is arranged in a reaction tank, water enters the reaction tank (1) through a water inlet pump (2), and the water in the reaction tank (1) is conveyed to the outside through the membrane module (4) through a water outlet pump (3);

s2: when the water pressure between the water outlet pump (3) and the membrane module (4) is greater than or equal to a preset threshold value, the chemical cleaning agent is reversely conveyed into the reaction tank (1) through the membrane module (4) by the water outlet pump (3);

s3: ultraviolet light is irradiated into the reaction tank (1) through an ultraviolet light source (6) so that the chemical cleaning agent generates free radicals in the reaction tank (1).

8. The method of cleaning a membrane reactor of claim 7, wherein: the irradiation of the ultraviolet light is continuous irradiation or intermittent irradiation with the frequency of 10 min/h.

9. The method of cleaning a membrane reactor of claim 7, wherein: the chemical cleaning agent is hypochlorite solution.

10. The method of cleaning a membrane reactor of claim 7, wherein: the predetermined threshold is 50 KPa.

Technical Field

The invention relates to the technical field of membrane reactors, in particular to a cleaning device and a cleaning method of a membrane reactor.

Background

The membrane reactor is a novel water treatment technology combining a membrane treatment unit and a biological treatment unit, has the advantages of small floor area, high effluent quality, simple and convenient operation, capability of meeting increasingly severe water treatment quality standards and good application prospect.

However, with the use of the reactor, the bacterial metabolites are deposited on the membrane surface and block the membrane pores, causing membrane pollution, causing water flux reduction or transmembrane pressure increase in the membrane separation process, which increases the operation and running cost of the membrane reactor, and hinders further application and popularization of the membrane reactor.

Disclosure of Invention

The invention provides a cleaning device and a cleaning method of a membrane reactor, which can solve the technical problems that: the mode that adopts water washing cleaning performance is not good and efficiency is lower.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a cleaning device of a membrane reactor comprises a reaction tank, a water inlet pump and a water outlet pump, wherein a membrane component is arranged in the reaction tank, the water outlet of the water inlet pump is communicated with the reaction tank, the water inlet of the water outlet pump is communicated with the water outlet of the membrane component, the cleaning device also comprises a solution tank and an ultraviolet light source, the solution tank is filled with chemical cleaning agent, the ultraviolet light source is fixedly arranged in the reaction tank, and the chemical cleaning agent generates free radicals under the irradiation of the chemical cleaning agent, when the water pressure between the water outlet pump and the membrane component is less than a preset threshold value, the water outlet of the water outlet pump is communicated with the outside, and the water outlet pump is used for positive conveying, when the water pressure between the water outlet pump and the membrane component is greater than or equal to a preset threshold value, and the water outlet of the water outlet pump is communicated with the water inlet of the solution tank, and the water outlet pump reversely conveys water.

The chemical cleaning agent is hypochlorite solution.

The predetermined threshold is 50 KPa.

The cleaning device also comprises an air pump and an aeration stone, wherein the aeration stone is fixedly arranged at the bottom of the reaction tank, and an air inlet of the aeration stone is communicated with an air outlet of the air pump.

The cleaning device further comprises a liquid level controller, a pressure sensor and a digital recorder, wherein the liquid level controller is fixedly installed on the reaction tank, the detection end of the liquid level controller is located in the reaction tank, the liquid level controller is electrically connected with the water inlet pump, and when the water pressure between the water outlet pump and the membrane assembly is smaller than a preset threshold value, the detection end of the pressure sensor is installed between the water outlet pump and the membrane assembly and is electrically connected with the digital recorder.

And the outer end face of the reaction tank is wrapped with a light shielding film.

A method for cleaning a membrane reactor, comprising the steps of:

s1: the membrane module is arranged in a reaction tank, water is fed into the reaction tank through a water inlet pump, and the water in the reaction tank is conveyed to the outside through the membrane module through a water outlet pump;

s2: when the water pressure between the water outlet pump and the membrane module is greater than or equal to a preset threshold value, the chemical cleaning agent is reversely conveyed into the reaction tank through the membrane module by the water outlet pump;

s3: and irradiating ultraviolet light into the reaction tank through an ultraviolet light source so that the chemical cleaning agent generates free radicals in the reaction tank.

The irradiation of the ultraviolet light is continuous irradiation or intermittent irradiation with the frequency of 10 min/h.

The chemical cleaning agent is hypochlorite solution.

The predetermined threshold is 50 KPa.

Compared with the prior art, the invention has the advantages that:

on original water washing system's basis, carry out the back flush through chemical cleaner to the membrane module again to make chemical cleaner produce the free radical of strong oxidizing property through ultraviolet ray, with the degradation of realization to pollutant on the membrane module, not only the cleaning performance is better, and cleaning efficiency promotes greatly moreover.

Drawings

FIG. 1 is a schematic diagram of the structure of a cleaning apparatus for a membrane reactor according to the present invention.

FIG. 2 is a schematic diagram of the structure of a cleaning apparatus for a membrane reactor according to the present invention.

FIG. 3 is a schematic representation of the time to fouling of the membrane after cleaning as a function of cleaning cycle.

FIG. 4 is a table showing the mixed liquor suspended solids concentration (MLSS) in three sets of reactors.

FIG. 5 is a table showing the concentrations of chloride and nitrate ions in the effluent of three sets of reactors.

FIG. 6 is a table showing the Total Organic Carbon (TOC) and Total Nitrogen (TN) concentrations in the effluent of three sets of reactors.

As shown in the figure: 1. the device comprises a reaction tank, 2, a water inlet pump, 3, a water outlet pump, 4, a membrane component, 5, a solution tank, 6, an ultraviolet light source, 7, an air pump, 8, an aeration stone, 9, a liquid level controller, 10, a pressure sensor, 11 and a digital recorder.

Detailed Description

The following is merely a preferred embodiment of the present invention, and the scope of the present invention is not limited thereby, and the present invention will be further explained with reference to the drawings and the embodiment.

Examples, see fig. 1-6:

a cleaning device of a membrane reactor comprises a reaction tank 1, a water inlet pump 2, a water outlet pump 3, a solution tank 5, an ultraviolet light source 6, an air pump 7, an aeration stone 8, a liquid level controller 9, a pressure sensor 10 and a digital recorder 11, wherein the membrane reactor is a continuous flow reactor and is an aerobic membrane bioreactor.

The membrane module 4 is placed in the reaction tank 1 to be cleaned.

The water inlet pump 2 and the water outlet pump 3 are peristaltic pumps, the water outlet of the water inlet pump 2 is communicated with the reaction tank 1 through a water inlet pipe, the water inlet of the water inlet pump is communicated with a water inlet tank with a water source outside, after the water inlet pump 2 is started, the water in the water inlet tank is conveyed to the reaction tank 1, the water inlet pump 2 is switched on and switched off by a liquid level controller 9, the liquid level controller 9 is fixedly installed on the reaction tank 1, the detection end of the liquid level controller is located in the reaction tank 1, the liquid level controller 9 is electrically connected with the water inlet pump 2, and the liquid level controller 9 enables the reaction tank 1 to keep constant water volume.

The solution tank 5 is filled with a chemical cleaning agent which is hypochlorite solution and can generate strong oxidizing free radicals under the irradiation of ultraviolet light, and the free radicals can destroy pollutants on the membrane module 4, so that the degradation of membrane pollutants is realized.

The ultraviolet light source 6 adopts an ultraviolet lamp tube which is fixedly arranged in a quartz glass tube, the quartz glass tube is fixedly arranged in the reaction tank 1 along the vertical direction, after the ultraviolet lamp tube is opened, ultraviolet light emitted from the ultraviolet lamp tube enables the chemical cleaning agent in the reaction tank 1 to generate free radicals, and the ultraviolet lamp tube is UVA, has the wavelength of 320-420 nm and has strong penetrating power.

The water inlet of the water outlet pump 3 is communicated with the water outlet of the membrane module 4 through a water outlet pipe, the water outlet pipe is also a backwashing pipe, when the water pressure between the water outlet pump 3 and the membrane module 4 is less than a preset threshold value, the water outlet of the water outlet pump 3 is communicated with an external water outlet tank, and the water outlet pump 3 forwards conveys the water, at the moment, the water in the reaction tank 1 is conveyed into the water outlet tank through the membrane module 4 by the water outlet pump 3 to realize the cleaning of the membrane module 4, and along with the cleaning operation, the pressure of the water between the water outlet pump 3 and the membrane module 4 is continuously increased due to the increased concentration of pollutants, wherein the detection of the water pressure is realized through a pressure sensor 10, when the water pressure between the water outlet pump 3 and the membrane module 4 is less than the preset threshold value, a detection end of the pressure sensor 10 is arranged between the water outlet pump 3 and the membrane module 4 and is electrically connected with a digital recorder 11, and when the water pressure between the water outlet pump 3 and the membrane module 4 is greater than or equal to the preset threshold value, the detection end of the pressure sensor 10 is disconnected with the water outlet pump 3 and the membrane module 4, and the digital recorder 11 does not record the water pressure during backwashing.

When the water pressure between the water outlet pump 3 and the membrane module 4 is greater than or equal to a preset threshold value, the water outlet of the water outlet pump 3 is disconnected from the water outlet tank and then communicated with the water inlet of the solution tank 5, and the water outlet pump 3 reversely conveys the chemical cleaning agent in the solution tank 5 to the reaction tank 1 through the membrane module 4, so that the degradation of membrane pollutants is realized.

Wherein the preset water pressure threshold value between the water outlet pump 3 and the membrane module 4 is 50 KPa.

Aeration stone 8 fixed mounting passes through the trachea intercommunication in the bottom of reaction tank 1, and its air inlet and the gas outlet of air pump 7, and air pump 7 is continuous aeration in with the aeration rate of 1L/min with the outside air to reaction tank 1 via aeration stone 8, not only can provide oxygen in for reaction tank 1, but also can elute the pollutants on falling membrane module 4.

The outer end face of the reaction tank 1 is wrapped with a light shielding film, the light shielding film can not only avoid the influence of natural light on the reaction tank 1, but also avoid the damage of ultraviolet rays to people.

Based on the membrane cleaning device, a membrane reactor cleaning method comprises the following steps:

s1: the membrane module 4 is placed in a reaction tank, water is fed into the reaction tank 1 through a water inlet pump 2, and the water in the reaction tank 1 is conveyed to the outside through the membrane module 4 through a water outlet pump 3, so that the membrane module 4 is cleaned through the water;

s2: when the water pressure between the water outlet pump 3 and the membrane module 4 is greater than or equal to a preset threshold value, the chemical cleaning agent is reversely conveyed into the reaction tank 1 through the membrane module 4 by the water outlet pump 3, so that the back washing of the membrane module 4 is realized;

s3: ultraviolet light is irradiated into the reaction tank 1 through the ultraviolet light source 6, so that the chemical cleaning agent generates free radicals in the reaction tank 1, and the membrane module 4 is efficiently cleaned.

The irradiation with ultraviolet light is continuous irradiation or intermittent irradiation at a frequency of 10 min/h.

The intermittent irradiation is more economical and efficient, and the specific experiment is as follows:

three sets of reactors were selected:

reactor R1: the ultraviolet light source 6 is not installed;

reactor R2: installing an ultraviolet light source 6, wherein the ultraviolet light source 6 is continuously irradiated;

reactor R3: the ultraviolet light source 6 was attached, and the ultraviolet light source 6 was intermittently irradiated at a frequency of 10 min/h.

According to fig. 3, the fouling time of the film after the film is cleaned by the reactors R2 and R3 equipped with the ultraviolet light source 6 is remarkably improved with the increase of the cleaning period, while the fouling time of the film after the film is cleaned by the reactor R1 not equipped with the ultraviolet light source 6 is continuously shortened with the increase of the cleaning period;

as shown in FIG. 4, the sludge concentration in the reactors R2 and R3 equipped with the ultraviolet light source 6 is equivalent to and greater than the sludge concentration in the reactor R1 not equipped with the ultraviolet light source 6.

As shown in FIG. 5, the reactor R3, which was equipped with the ultraviolet light source 6 and irradiated intermittently at a frequency of 10min/h, had the highest concentrations of chloride ions and nitrate ions.

As shown in FIG. 6, the TOC and TN concentrations were the highest in the reactor R3 in which the ultraviolet light source 6 was installed and which was intermittently irradiated at a frequency of 10 min/h.

It can be seen that the cleaning effect of the contaminated material on the membrane module 4 is better after the ultraviolet light source 6 is installed, and the cleaning effect is best when the ultraviolet light source 6 is intermittently irradiated at a frequency of 10 min/h.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.