Off-line cleaning and detecting device for polluted membrane component of membrane separation system

Abstract

The utility model relates to an off-line cleaning and detecting device for a polluted membrane component of a membrane separation system, which comprises a water inlet bucket, a water inlet pump, a plurality of membrane pipes and valve bodies, a liquid inlet pipe and a first valve body arranged on the liquid inlet pipe are arranged at the liquid inlet end of the water inlet bucket; a liquid outlet pipe, a second valve body and the water inlet pump are arranged at the liquid outlet end of the water inlet bucket, the second valve body is connected to the liquid inlet pipe in series, the inlet ends of the membrane pipes are connected with the outlet end of the water inlet pump in parallel through respective third valve bodies, and the outlet ends of the membrane pipes comprise trapped liquid outlet ends and permeated liquid outlet ends. A trapped fluid outlet end of each membrane pipe is connected to a sewage drainage ditch or a water inlet barrel after passing through a fourth valve body, a permeated fluid outlet end of each membrane pipe is connected to the sewage drainage ditch or the water inlet barrel after passing through a fifth valve body, a backflow pipeline for backflow to the water inlet barrel is connected between the outlet end of the water inlet pump and the third valve body in a bypass mode, and a sixth valve body is connected to the backflow pipeline in series; according to the water inlet pump, the surface of the membrane module can have a larger washing flow speed, and the cleaning effect is better.

Description

Technical Field

[0001] The utility model relates to the field of industrial wastewater treatment, in particular to an off-line cleaning and detection device for a polluted membrane component of a membrane separation system. Background Art

[0002] In the field of industrial wastewater treatment and resource recovery, membrane separation systems formed by spiral membrane components are widely used. They can selectively intercept pollutants so that the effluent meets discharge standards. For example, the nanofiltration system in the mainstream membrane bioreactor and nanofiltration combined process for landfill leachate treatment has excellent interception performance for humic acid, a difficult-to-degrade organic matter, after biochemical treatment of the leachate.

[0003] Some rolled membrane components used for material separation can achieve high-concentration separation and concentration, and the membrane retentate formed can be recycled. For example, the nanofiltration concentrate produced by the mainstream combined process of leachate treatment can achieve full treatment of the nanofiltration concentrate and separation and recovery of humic acid liquid fertilizer through a process composed of a material separation membrane system with different molecular weight cutoffs.

[0004] After long-term operation, the water output of the membrane separation system will gradually decrease, the operating pressure will gradually increase, etc. Insoluble salts, organic matter and microbial dirt will inevitably be deposited in the membrane, causing membrane pollution. Therefore, it must be cleaned and removed in time, otherwise it will have a great impact on the operation of the membrane system.

[0005] At present, a commonly used method for cleaning membrane components in membrane separation systems is to use online chemical cleaning of membrane components. Online chemical cleaning of membrane components refers to the use of a certain concentration of chemical reagents in the membrane separation system to chemically react with pollutants on the membrane surface or in the membrane pores, thereby removing pollutants. However, usually a membrane tube in a membrane separation system has multiple membrane components, and the water inlet flow rate of a single membrane tube is difficult to reach a flow rate of 3m / s on the membrane surface, especially at the retentate outlet. Since part of the feed liquid enters the permeate, the flow rate on the membrane component surface at this position is usually small, so it is more prone to dirt contamination, and it is also difficult to flush it out during chemical cleaning. When the dirt contamination is serious, the online cleaning effect is usually not good. At the same time, it is impossible to judge the cleaning effect of each membrane component. Utility Model Content

[0006] The utility model aims to provide an off-line cleaning and detection device for a contaminated membrane component of a membrane separation system, which can solve the shortcomings of the existing on-line chemical cleaning technology of the membrane system.

[0007] The technical solution adopted by this utility model:

[0008] An off-line cleaning and detection device for contaminated membrane components of a membrane separation system, characterized in that it comprises, in sequence, a water inlet bucket, a water inlet pump, a plurality of membrane tubes and a plurality of valve bodies connected in series to the pipeline, the liquid inlet end of the water inlet bucket is provided with a liquid inlet pipe and a first valve body provided on the liquid inlet pipe, the liquid outlet end of the water inlet bucket is provided with a liquid outlet pipe, a second valve body connected in series to the liquid inlet pipe and the water inlet pump, the inlet ends of the plurality of membrane tubes are respectively connected in parallel with the outlet end of the water inlet pump via respective third valve bodies, the outlet ends of the plurality of membrane tubes include a retained liquid outlet end and a permeate liquid outlet end, the retained liquid outlet end of each membrane tube is respectively connected to a sewage ditch or a water inlet bucket after passing through a fourth valve body, the permeate liquid outlet end of each membrane tube is respectively connected to a sewage ditch or a water inlet bucket after passing through a fifth valve body, a reflux pipeline for returning to the water inlet bucket is connected between the outlet end of the water inlet pump and the third valve body, and a sixth valve body is connected in series to the reflux pipeline.

[0009] Preferably, the water inlet barrel is also connected to a discharge pipeline, a discharge valve arranged on the discharge pipeline, and a liquid level meter; an online pH meter is also connected to the pipeline between the second valve body and the water inlet pump, and a membrane tube inlet pressure gauge and a feed liquid float flowmeter are also connected between the water inlet pump and the third valve body, and the inlet end of each third valve body is connected in parallel to the outlet end of the feed liquid float flowmeter.

[0010] Preferably, the outlet end of the fourth valve body is also connected to a trapped liquid pressure gauge and a trapped liquid float flowmeter in sequence and then connected to a sewage ditch or a water inlet bucket.

[0011] Preferably, the outlet end of the fifth valve body is connected to a permeate float flowmeter and then connected to a sewage ditch or a water inlet bucket.

[0012] Preferably, the first valve body, the second valve body, the third valve body, the fourth valve body, the fifth valve body and the sixth valve body connected in series on the pipeline are ball valves.

[0013] Preferably, the effective volume of the water inlet bucket is not less than 2m 3 .

[0014] Preferably, the flow rate of the water inlet pump is not less than 30m 3 / h, the water flow rate of each membrane tube is higher than 5m 3 / h, lift 30-40m.

[0015] Preferably, there are 6 membrane tubes, each of which is equipped with a membrane module, and the specification of the membrane module is 8040.

[0016] Positive effects of the utility model:

[0017] 1. In the utility model, the water outlet of the water inlet pump is provided with two circuits, one circuit is used for feeding the membrane assembly, and the other circuit is opened when necessary to flow back into the water bucket for stirring and mixing, which can achieve an excellent chemical cleaning liquid preparation effect.

[0018] 2. In the utility model, only a single membrane assembly is installed in each membrane tube, and the water inlet pump can be controlled by frequency conversion, and the opening and closing of the valve body on the water inlet end of the membrane tube and the retained liquid pipe are combined to control the appropriate flow rate, so that the surface of the membrane assembly has a larger flushing flow rate and the cleaning effect is better.

[0019] 3. In the utility model, the water inlet, retentate and permeate pipelines of the membrane tube are all provided with pressure gauges, ball valves and float flowmeters. After the chemical cleaning is completed, tap water or membrane system feed liquid can be filled into the water inlet bucket. By controlling the frequency of the water inlet pump, the water inlet of the membrane tube, the ball valves on the retentate and permeate pipelines, and observing the values ​​of the pressure gauge and float flowmeter, the cleaning effect of a single membrane assembly can be conveniently detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Figure 1 It is a structural schematic diagram of a working state of the utility model;

[0022] Figure 2 It is a structural schematic diagram of another working state of the utility model;

[0023] In the figure, 1. the first valve body (i.e. the ball valve on the liquid inlet pipe); 2. the water inlet bucket; 3. the second valve body (i.e. the ball valve on the water outlet pipe of the water inlet bucket); 4. the sixth valve body (i.e. the ball valve on the two circuits of the water inlet pump and the water outlet that flows back into the water bucket); 5. the online pH meter; 6. the liquid level meter; 7. the water inlet pump; 8. the membrane tube inlet pressure gauge; 9. the feed liquid float flowmeter; 10. the third valve body (i.e. the membrane tube inlet ball valve); 11. the membrane tube; 12. the fourth valve body (i.e. the retained liquid ball valve); 13. the retained liquid pressure gauge; 14. the retained liquid float flowmeter; 15. the fifth valve body (i.e. the permeate liquid ball valve); 16. the permeate liquid float flowmeter; 17. the discharge valve. DETAILED DESCRIPTION

[0024] The utility model discloses an off-line cleaning and detection device for a contaminated membrane assembly of a membrane separation system, which comprises a water inlet bucket 2, a water inlet pump 7, a plurality of membrane tubes 11 and a plurality of valve bodies connected in series to the pipeline in sequence. Specifically, the liquid inlet end of the water inlet bucket 2 is provided with a liquid inlet pipe (tap water pipe) and a first valve body 1 provided on the liquid inlet pipe, and the liquid outlet end of the water inlet bucket is provided with a liquid outlet pipe, a second valve body 3 connected in series to the liquid inlet pipe and the water inlet pump 7, and an online pH meter is also connected to the pipeline between the second valve body 3 and the water inlet pump 7; the water inlet bucket 2 is also connected with a discharge pipeline and a discharge valve 17 provided on the discharge pipeline, as well as a liquid level meter 6;

[0025] The inlet ends of multiple membrane tubes are connected in parallel with the outlet ends of the water inlet pump 7 through their respective third valve bodies 10. Specifically, a membrane tube inlet pressure gauge 8 and a feed liquid float flowmeter 9 are also connected between the water inlet pump 7 and the third valve body 10. The inlet end of each third valve body 10 is connected in parallel to the outlet end of the feed liquid float flowmeter 9.

[0026] The outlet ends of the multiple membrane tubes include a retained liquid outlet end and a permeate outlet end. The retained liquid outlet end of each membrane tube passes through the fourth valve body 12 and is connected to a sewage ditch or a water inlet bucket. The permeate outlet end of each membrane tube passes through the fifth valve body 15 and is connected to a sewage ditch or a water inlet bucket. Specifically, the outlet end of the fourth valve body 12 is also connected to a retained liquid pressure gauge 13 and a retained liquid float flowmeter 14 in sequence and then connected to a sewage ditch or a water inlet bucket; the outlet end of the fifth valve body 15 is connected to a permeate float flowmeter 16 and then connected to a sewage ditch or a water inlet bucket.

[0027] A reflux pipeline for returning water to the water inlet bucket 2 is connected between the outlet end of the water inlet pump 7 and the third valve body 10, and a sixth valve body 4 is connected in series to the reflux pipeline.

[0028] The effective volume of the water inlet bucket shall not be less than 2m 3 , the water inlet pump flow rate is not less than 30m 3 / h, the water flow rate of each membrane tube is higher than 5m 3 / h, head distance 30-40m, there are 6 membrane tubes, each of which is equipped with a membrane module, and the specification of the membrane module is 8040.

[0029] The first valve body 1, the second valve body 3, the third valve body 10, the fourth valve body 12, the fifth valve body 15 and the sixth valve body 4 connected in series on the pipeline are ball valves, which can be manually or electrically controlled.

[0030] During operation, the first valve body 1 is opened, and tap water flows into the water inlet bucket 2. Chemical agents are added to the water inlet bucket as needed to prepare cleaning liquid. When preparing the chemical cleaning liquid, the second valve body 3 and the sixth valve body 4 are opened, the third valve body 10 is closed, and the water in the water bucket flows back after the water inlet pump 7 to stir, mix or dissolve the chemical agents; the tap water or the prepared cleaning liquid passes through the second valve body 3 and the online pH meter 5, and the water inlet pump 7 controlled by the variable frequency electric control box lifts the chemical cleaning liquid through the pressure gauge 8, the float flowmeter 9 and the third valve body 10, and then enters the membrane tubes 11 equipped with the contaminated membrane assembly, forming the retained liquid and the permeated liquid at the outlet of the membrane tube; the retained liquid passes through the fourth The permeate also passes through the fifth valve body 15 and the float flowmeter 16 of each membrane tube 11 and then merges and is discharged into the sewage ditch (the water inlet bucket is tap water at this time) or flows back into the water inlet bucket 2 (the water inlet bucket is chemical cleaning liquid at this time). After the chemical cleaning liquid completes the cleaning, open the discharge valve 17 on the drain pipe at the bottom of the water inlet bucket to discharge the chemical cleaning liquid in the bucket into the sewage ditch, then introduce tap water into the water inlet bucket 2, and start the water inlet pump 7 to continuously flush the membrane assembly.

[0031] After repeated cleaning with different chemical agents and rinsing with tap water, fill the water inlet bucket 2 with tap water or feed liquid of the membrane system, start the water inlet pump 7, observe the permeate flow rate of each membrane component, and detect the chemical cleaning effect and service life.

[0032] Detailed working process of this utility model:

[0033] Step 1: The membrane assembly that has reached serious membrane pollution during deep treatment of landfill leachate is taken out from the membrane separation system and loaded into the membrane tube 11 of the offline cleaning and detection device of the present application;

[0034] Step 2: Open the first valve body 1 on the liquid inlet pipe (tap water pipe) of the water inlet bucket 2, and let tap water flow in to control the liquid level;

[0035] Step 3: Set the frequency of the variable frequency electric control box, open the second valve body 3 and the water inlet pump 7 and the third valve body 10 on the water inlet bucket outlet pipe, and close the sixth valve body 4 on the other reflux water inlet bucket loop; the tap water passes through the outlet pipe and the second valve body 3 and the online pH meter 5 on it and is lifted by the water inlet pump 7 controlled by the variable frequency electric control box, and then passes through the pressure gauge 8, the float flowmeter 9 and the third valve body 10 to enter each membrane tube 11 equipped with the contaminated membrane assembly, and forms a retained liquid and a permeate at the outlet of the membrane tube; the retained liquid of each membrane tube passes through the fourth valve body 12 respectively and then merges, and then passes through the pressure gauge 13 and the float flowmeter 14 and then is discharged into the nearby sewage ditch, and the permeate of each membrane tube also passes through the fifth valve body 15 and the float flowmeter 16 respectively and then merges and is discharged into the sewage ditch; after observing that the color of the retained liquid in the float flowmeter 16 gradually changes to light yellow, the water inlet pump 7 and the first valve body 1 are closed;

[0036] Step 4: Open the first valve body 1 on the liquid inlet pipe (tap water pipe) of the water inlet bucket, let tap water flow in to the set liquid level, add chemical agents of appropriate type and quality, open the second valve body 3, the water inlet pump 7 and the sixth valve body 4 on the water outlet pipe of the water inlet bucket, close the third valve body 10, start the water inlet pump 7, let the liquid flow back into the water bucket 2 for stirring, mixing or dissolving, and prepare the chemical cleaning solution;

[0037] Step 5: Set the frequency of the variable frequency electric control box, open the second valve body 3, the water inlet pump 7 and the third valve body 10 on the water outlet pipe of the water inlet bucket, close the sixth valve body 4, start the water inlet pump 7 to lift the chemical cleaning liquid in the water inlet bucket 2 through the pressure gauge 8, the float flowmeter 9 and the third valve body 10, and then enter the membrane tube 11 to rinse the membrane assembly, and form a retained liquid and a permeate at the outlet of the membrane tube. The retained liquids of each membrane tube are combined and then flow back to the water inlet bucket 2 through the pressure gauge 13 and the float flowmeter 14. The permeate of each membrane tube also flows back to the water inlet bucket 2 after passing through the respective fifth valve bodies 15 and the float flowmeter 16; after the set cycle cleaning time is reached, and combined with the observation of the color of the retained liquid in the float flowmeter 16, the water inlet pump 7 is closed in time;

[0038] Step 6: Open the discharge valve 17 on the drain pipe at the bottom of the water inlet bucket 2 to drain the used chemical cleaning liquid into the sewage ditch;

[0039] Step 7: Repeat steps 2 and 3 above;

[0040] Step 8: Add the combined chemical agent for the next cleaning, and repeat the above steps 4, 5 and 6;

[0041] Step 9: Repeat steps 2 and 3 above;

[0042] Step 10: After completing chemical cleaning and tap water rinsing, fill the water inlet bucket 2 with tap water or feed liquid of the membrane system, start the water inlet pump 7, control the appropriate frequency of the variable frequency electric control box, observe the flow rate and color of the permeate flowing out of the membrane tube 11 equipped with each membrane assembly displayed in the float flow meter 16, detect the chemical cleaning effect, and judge the service life.

[0043] Positive effects of the utility model:

[0044] 1. In the utility model, the water outlet of the water inlet pump is provided with two circuits, one circuit is used for feeding the membrane assembly, and the other circuit is opened when necessary to flow back into the water bucket for stirring and mixing, which can achieve an excellent chemical cleaning liquid preparation effect.

[0045] 2. In the utility model, only a single membrane assembly is installed in each membrane tube, and the water inlet pump can be controlled by frequency conversion, and the opening and closing of the valve body on the water inlet end of the membrane tube and the retained liquid pipe are combined to control the appropriate flow rate, so that the surface of the membrane assembly has a larger flushing flow rate and the cleaning effect is better.

[0046] 3. In the utility model, the water inlet, retentate and permeate pipelines of the membrane tube are all provided with pressure gauges, ball valves and float flowmeters. After the chemical cleaning is completed, tap water or membrane system feed liquid can be filled into the water inlet bucket. By controlling the frequency of the water inlet pump, the water inlet of the membrane tube, the ball valves on the retentate and permeate pipelines, and observing the values ​​of the pressure gauge and float flowmeter, the cleaning effect of a single membrane assembly can be conveniently detected.

[0047] The above is only a preferred specific implementation of the utility model, and does not limit the technical scope of the utility model. Therefore, any minor modifications, modifications and equivalent changes made to the above examples based on the core technology of the utility model still fall within the protection scope of the technical solution of the utility model.

Claims

1. An off-line cleaning and detection device for contaminated membrane components of a membrane separation system, characterized in that: The invention comprises a water inlet bucket (2), a water inlet pump (7), a plurality of membrane tubes (11) and a plurality of valve bodies connected in series to the pipeline, wherein the liquid inlet end of the water inlet bucket (2) is provided with a liquid inlet pipe and a first valve body (1) provided on the liquid inlet pipe, the liquid outlet end of the water inlet bucket is provided with a liquid outlet pipe, a second valve body (3) connected in series to the liquid inlet pipe and the water inlet pump (7), the inlet ends of the plurality of membrane tubes are respectively connected to the outlet ends of the water inlet pump (7) via respective third valve bodies (10). The plurality of membrane tubes are connected in parallel, the outlet ends of the plurality of membrane tubes include a retained liquid outlet end and a permeate outlet end, the retained liquid outlet end of each membrane tube passes through a fourth valve body (12) and is connected to a sewage ditch or a water inlet bucket, and the permeate outlet end of each membrane tube passes through a fifth valve body (15) and is connected to a sewage ditch or a water inlet bucket, a reflux pipeline for returning to the water inlet bucket (2) is connected between the outlet end of the water inlet pump (7) and the third valve body (10), and a sixth valve body (4) is connected in series to the reflux pipeline.

2. The off-line cleaning and detection device for contaminated membrane components of a membrane separation system according to claim 1, characterized in that: The water inlet barrel (2) is also connected to a discharge pipeline and a discharge valve (17) arranged on the discharge pipeline, as well as a liquid level meter (6); an online pH meter is also connected to the pipeline between the second valve body (3) and the water inlet pump (7); a membrane tube inlet pressure gauge (8) and a feed liquid float flowmeter (9) are also connected between the water inlet pump (7) and the third valve body (10); the inlet end of each third valve body (10) is connected in parallel to the outlet end of the feed liquid float flowmeter (9).

3. The off-line cleaning and detection device for contaminated membrane components of a membrane separation system according to claim 2, characterized in that: The outlet end of the fourth valve body (12) is also connected in sequence to a trapped liquid pressure gauge (13) and a trapped liquid float flow meter (14) and then connected to a sewage ditch or a water inlet bucket.

4. The off-line cleaning and detection device for contaminated membrane components of a membrane separation system according to claim 3, characterized in that: The outlet end of the fifth valve body (15) is connected to the permeate float flowmeter (16) and then connected to a sewage ditch or a water inlet bucket.

5. The off-line cleaning and detection device for contaminated membrane components of a membrane separation system according to claim 4, characterized in that: The first valve body (1), the second valve body (3), the third valve body (10), the fourth valve body (12), the fifth valve body (15) and the sixth valve body (4) which are serially connected to the pipeline are ball valves.

6. The off-line cleaning and detection device for a contaminated membrane assembly of a membrane separation system according to claim 1, characterized in that: The effective volume of the water inlet bucket is not less than 2m 3 .

7. The off-line cleaning and detection device for a contaminated membrane assembly of a membrane separation system according to claim 1, characterized in that: The water inlet pump flow rate is not less than 30m 3 / h, the water flow rate of each membrane tube is higher than 5m 3 / h, lift 30-40m.

8. The off-line cleaning and detection device for a contaminated membrane assembly of a membrane separation system according to claim 1, characterized in that: There are 6 membrane tubes, each of which is equipped with a membrane module, and the specification of the membrane module is 8040.

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