CN109201644B - Cleaning method for bacterial sludge breeding on inner wall of water inlet pipeline of NF/RO membrane unit - Google Patents
Cleaning method for bacterial sludge breeding on inner wall of water inlet pipeline of NF/RO membrane unit Download PDFInfo
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- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
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Abstract
The invention discloses a method for cleaning bacterial sludge breeding on the inner wall of a water inlet pipeline of an NF/RO membrane unit, which comprises the following steps: emptying residual sewage in the water inlet pipeline, and cleaning the inner wall of the water inlet pipeline by using water until the water quality chromaticity of the eluate is less than 10 times; circularly cleaning the inner wall of the water inlet pipeline and the NF/RO membrane unit by adopting a sodium bisulfite solution, and soaking the NF/RO membrane unit in the sodium bisulfite solution; soaking the inner wall of the water inlet pipeline by using a cleaning agent; cleaning the inner wall of the water inlet pipeline by using water; and (4) circularly cleaning the inner wall of the water inlet pipeline by adopting a neutralizing agent to finish cleaning the inner wall of the water inlet pipeline of the NF/RO membrane unit breeding bacterial sludge. The cleaning method can effectively remove the bacterial sludge bred on the inner wall of the water inlet pipeline, has the advantages of simple process, easy operation, low treatment cost, high cleaning efficiency, good cleaning effect and the like, can meet the actual treatment requirement, and has good application value and application prospect.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and relates to a method for cleaning bacterial sludge breeding on the inner wall of a water inlet pipeline of an NF/RO membrane unit.
Background
At present, MBR + NF/RO processes are commonly adopted in the treatment method of landfill leachate, wherein ultrafiltration membrane elements are important components, and the service life of the common ultrafiltration membrane elements is 3-5 years. When the service life of the ultrafiltration membrane element is close to or exceeds 3-5 years, the interception performance of the ultrafiltration membrane element on microorganisms is reduced. In particular, in the practical application process, in order to improve the utilization efficiency of equipment and reduce the production and operation cost, only a small part of ultrafiltration membrane elements with low flux are usually replaced, but most of the ultrafiltration membrane elements which exceed the service life can still be used, and even can still be used after 6 years of operation, as a result, the retention performance of the ultrafiltration membrane elements on microorganisms is obviously reduced, and the microorganisms such as bacteria and the like can enter an ultrafiltration clear liquid collecting tank through the aged ultrafiltration membrane elements. When microorganism bacteria enter the ultrafiltration clear liquid collecting tank through the ultrafiltration membrane element, organisms dissolved in ultrafiltration clear liquid are used for breeding, breeding and growing metabolism in places such as the inside of the ultrafiltration clear liquid collecting tank, the inner wall of a water inlet pipeline of the NF/RO membrane unit, a filter, the surface of the NF/RO membrane and the like, a large amount of bacteria sludge is attached to the surfaces of the parts and easily blocks the water inlet pipeline, the filter, the NF/RO membrane element, a high-pressure pump and the like, and therefore a series of problems that a filter bag in the filter at the front end of the NF/RO membrane element is frequently replaced, the pressure difference at the front end and the rear end of the membrane element is high in rising speed and the like are caused. Particularly, when the temperature is high in the day, such as summer, the temperature belongs to a high-temperature season, and the high temperature is continuously about 32 ℃, which is the optimal temperature for bacterial propagation, the content of organic matters in clear liquid penetrating through the ultrafiltration membrane element is 400-800 mg/L, energy is provided for bacterial propagation, and carriers are provided for bacterial propagation in places such as the inner surface of the ultrafiltration clear liquid collecting tank, the inner wall of a water inlet pipeline of the NF/RO membrane unit, the surface of the filter and the NF/RO membrane, so that the bacterial propagation speed is high, and as a result, parts such as the pipeline, the filter bag, the NF/RO membrane element and the like are cleaned and replaced more frequently. Through statistical analysis, a large amount of biological bacteria slime (bacterial sludge) is attached to the inner wall of the water inlet pipeline and the inner wall of the filter, a filter bag in the filter at the front end of the NF/RO membrane element needs to be replaced 4 times or more every day, and the pressure difference between the front end and the rear end of the NF/RO membrane element rises at the rate of 0.8-1.3 bar/day. The above problems directly increase the operation cost, increase the treatment difficulty, increase the treatment effect and make it difficult to meet the design requirements. Therefore, the method has very important significance for effectively cleaning the inner wall of the water inlet pipeline of the NF/RO membrane unit to breed the bacterial sludge.
At present, the method for cleaning the inner wall of the water inlet pipeline of the NF/RO membrane unit to breed bacterial sludge mainly comprises the following steps: (1) manual mechanical cleaning methods, which require the removal of the pipe and then mechanical descaling by manual tapping, have the following problems: the construction period is long, the number of constructors is large, the strength is high, the efficiency is low, the cleaning effect is poor, the influence on the production is large, and the production efficiency is seriously influenced. (2) A chemical agent cleaning method is characterized in that a chemical agent which reacts with sludge is manually poured into a pipeline at the highest point of the pipeline, and the chemical agent and the sludge on the inner wall of the pipeline are subjected to chemical reaction or sludge dissolution, so that the effect of removing the sludge is achieved, but the problems of poor cleaning effect, long cleaning time and the like still exist in the existing chemical agent cleaning method. In addition, if the cleaning is performed by manually injecting chemical agents, the following problems still exist: the gas generated by air and reaction in the pipeline is not easy to discharge, so that the cleaning chemical agent is not smoothly poured, the poured cleaning chemical agent is easy to splash, great personal safety hazards exist, the cleaning chemical agent and the pipeline cannot be in full contact, and the cleaning efficiency and the cleaning effect are poor. Therefore, the cleaning method for the bacterial sludge breeding on the inner wall of the water inlet pipeline of the NF/RO membrane unit, which has the advantages of simple process, easy operation, low treatment cost, high cleaning efficiency and good cleaning effect, is obtained, and has very important significance for improving the treatment effect of the MBR + NF/RO process and expanding the application range of the MBR + NF/RO process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cleaning method for bacterial sludge breeding on the inner wall of a water inlet pipeline of an NF/RO membrane unit, which has the advantages of simple process, easy operation, low treatment cost, high cleaning efficiency and good cleaning effect.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for cleaning bacterial sludge breeding on the inner wall of a water inlet pipeline of an NF/RO membrane unit comprises the following steps:
s1, emptying residual sewage in the water inlet pipeline, and cleaning the inner wall of the water inlet pipeline by using water until the water quality chromaticity of the eluate is less than 10 times;
s2, after the step S1 is finished, the inner wall of the water inlet pipeline and the NF/RO membrane unit are circularly cleaned by adopting sodium bisulfite solution, so that the NF/RO membrane unit is soaked in the sodium bisulfite solution;
s3, after the step S2 is finished, soaking the inner wall of the water inlet pipeline by adopting a cleaning agent;
s4, after the step S3 is finished, cleaning the inner wall of the water inlet pipeline by water;
and S5, after the step S4 is finished, the inner wall of the water inlet pipeline is circularly cleaned by adopting a neutralizing agent, and the cleaning of bacterial sludge breeding on the inner wall of the water inlet pipeline of the NF/RO membrane unit is completed.
In the above cleaning method, further improvement, in the step S2, the concentration of the sodium bisulfite solution is 8000ppm to 15000 ppm.
In the above cleaning method, in a further improvement, in the step S3, the cleaning agent is one of a sodium hypochlorite solution, an activated carbon mixed solution, an EDTA solution, and a non-oxidizing bactericide.
In the cleaning method, the effective chlorine concentration in the sodium hypochlorite solution is further improved to be 20-40 g/kg; the pH value of the sodium hypochlorite solution is 10.5-12.5.
In a further improvement of the above cleaning method, the non-oxidizing biocide is formaldehyde or glutaraldehyde.
In a further improvement of the above cleaning method, in step S5, the neutralizing agent is a sodium bisulfite solution or a reducing acidic solution.
In the cleaning method, the concentration of the sodium bisulfite solution is further improved to be 8000ppm to 15000 ppm.
In the above cleaning method, further improvement, the reducing acidic solution is H2One of S solution, phosphite solution and hypophosphite solution.
In the above cleaning method, further improvement is said H2The concentration of the S solution is 0.4 mol/L-0.8 mol/L.
In the above cleaning method, further improvement is provided, in the step S2, the time of the cyclic cleaning is 10min to 20 min.
In the above cleaning method, it is further improved that in the step S3, the soaking is to circulate the cleaning agent in the pipeline for 20min to 40min, and to soak for 5min to 15min, and repeat the above operations for 3 to 6 times.
In the above cleaning method, further modified, in step S1, the water is recycled water.
In the above cleaning method, further modified, in step S4, the water is recycled water.
In the above cleaning method, further improvement is provided, in the step S5, the time of the cyclic cleaning is 10min to 20 min.
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a method for cleaning bacterial sludge breeding on the inner wall of a water inlet pipeline of an NF/RO membrane unit, which can effectively clean the bacterial sludge breeding on the inner wall of the water inlet pipeline of the NF/RO membrane unit, inhibit the breeding of bacteria, reduce the replacement frequency of a filter bag of a filter at the front end of an NF/RO membrane, reduce the operation cost, prevent the NF/RO membrane unit from being polluted by bacteria, improve the service life and the water production efficiency of the membrane, has the advantages of simple process, easy operation, low treatment cost, high cleaning efficiency, good cleaning effect and the like, can meet the actual treatment requirement, and has good application value and application prospect.
(2) In the cleaning method, the NF/RO membrane element is soaked by the sodium sulfite solution, which plays a core role and can prevent a cleaning agent (such as a sodium hypochlorite solution) from oxidizing the NF/RO membrane element in the subsequent soaking process, thereby avoiding the damage of the cleaning agent to the NF/RO membrane element and realizing the effective protection of the NF/RO membrane element. The sodium sulfite solution used in the invention is prepared from industrial-grade sodium sulfite, and has the advantages of low price, easy obtainment and the like.
(3) In the cleaning method, the inner wall of the water inlet pipeline of the NF/RO membrane unit is soaked by the sodium hypochlorite solution, so that bacterial sludge attached to the inner wall of the water inlet pipeline can be quickly and effectively dissolved, and the aim of sterilizing and cleaning dirt is fulfilled under the condition of lowest operation cost by controlling the parameters of the sodium hypochlorite solution, such as effective chlorine concentration, pH, soaking time and the like, and the water inlet pipeline of the NF/RO membrane unit can be effectively cleaned, so that the cleaning effect is better, because: if the effective chlorine concentration in the sodium hypochlorite solution is too high, the sodium hypochlorite solution can be wasted, the treatment cost is not favorably reduced, the safety risk (potential safety hazard) of the sodium hypochlorite solution in the treatment process can be increased due to the too high effective chlorine concentration, and the bacteria on the inner wall of the pipeline are difficult to dissolve and killed by the sodium hypochlorite solution due to the too low effective chlorine concentration in the sodium hypochlorite solution, so that the cleaning effect is poor; if the pH of the sodium hypochlorite solution is too high, the consumption of caustic soda liquid in the neutralization process is increased, which increases the cost, and if the pH of the sodium hypochlorite solution is too low, the cleaning effect is also poor; if the sodium hypochlorite solution is too long in soaking time, the productivity is greatly reduced, the industrial production is not facilitated, and the problems of poor cleaning effect and the like exist due to too short soaking time. In addition, the sodium hypochlorite solution used in the invention is prepared from industrial grade sodium hypochlorite, and has the advantages of low price, easy obtainment and the like.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
FIG. 1 is a flow chart of a cleaning process for bacterial sludge growing on the inner wall of a water inlet pipe of an NF/RO membrane unit in embodiment 1 of the invention.
Fig. 2 is a comparison diagram of the inner walls of the water inlet pipes of the NF/RO membrane unit before and after cleaning in example 1 of the present invention, wherein (a) is before cleaning and (b) is after cleaning.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
The materials and equipment used in the following examples are commercially available. In the examples of the present invention, unless otherwise specified, the processes used are conventional processes, and the apparatuses used are conventional apparatuses.
Example 1:
a method for cleaning bacterial sludge breeding on the inner wall of a water inlet pipeline of an NF/RO membrane unit is shown in figure 1 and comprises the following steps:
and S1, pretreatment. And (4) emptying residual sewage in the water inlet pipeline, flushing the inner wall of the water inlet pipeline by using reclaimed water (water discharged from the reverse osmosis membrane system) to clean the inner wall of the pipeline until the water quality chromaticity of the eluate is less than 10 times, and stopping flushing.
And S2, membrane element protection program. And after the step S1 is finished, placing a sodium bisulfite solution with the concentration of 10000ppm in an ultrafiltration clear liquid collecting tank, starting a circulating cleaning program, circularly cleaning the inner wall of the water inlet pipeline and the NF/RO membrane unit for 15min, and simultaneously soaking the NF/RO membrane unit in the sodium bisulfite solution to prevent the subsequent sodium hypochlorite solution from oxidizing the membrane unit.
And S3, soaking and sterilizing. After the step S2 is finished, soaking the inner wall of the water inlet pipe 11 at normal temperature by using a sodium hypochlorite solution with an effective chlorine concentration of 25g/kg and a pH value of 11.8, specifically: and (3) conveying the sodium hypochlorite solution into the water inlet pipeline by using a pump, filling the pipeline with the sodium hypochlorite solution, circulating the sodium hypochlorite solution in the pipeline for 30min by using the pump, standing and soaking for 10min, and repeating the operation for 5 times. In this process, because the pump pressurizes the cleaning agent, the kinetic energy of cleaning agent has been increased, this moment get into the cleaning agent after in the washing pipeline active ingredient in the pipeline with the increase of bacterium mud collision frequency, micromolecule substance operating rate accelerates, effective area of contact increases, cleaning agent and bacterium mud reaction rate are fast, can promote bacterium mud and chemical agent to take place chemical reaction or dissolve each other, and finally reduce the time that chemical agent soaks the pipeline, improve cleaning efficiency and cleaning quality. In this step, the relevant valves are controlled to prevent leakage of the sodium hypochlorite solution.
And S4, washing the pipeline with water. And (4) after the step (S3) is finished, washing the inner wall of the water inlet pipeline by using reclaimed water (water discharged from the reverse osmosis membrane system) to clean the inner wall of the pipeline so as to achieve the purpose of cleaning a sodium hypochlorite solution (cleaning agent) in the pipeline, and stopping washing until the chlorine content in the eluate is less than 0.1 ppm.
And S5, cleaning the pipeline by using the neutralizing agent. After the step S4 is finished, the sodium bisulfite solution with the concentration of 10000ppm (not limited to the concentration, and other concentrations can be used, such as 8000 ppm-15000 ppm), is placed in the ultrafiltration clear liquid collecting tank, the circulating cleaning procedure is started, the inner wall of the water inlet pipeline is cleaned for 15min in a circulating way, the sodium bisulfite solution is used for washing the residual sodium hypochlorite solution in the water inlet pipeline, so that the purpose of cleaning the residual sodium hypochlorite solution (cleaning agent) on the inner wall of the pipeline is achieved, and the cleaning of the bacterial sludge breeding on the inner wall of the water inlet pipeline of the NF/RO membrane unit is finished.
And S6, starting the computer. And after the step S5 is finished, starting a water production program and starting the machine normally.
In this embodiment, the NF/RO membrane unit corresponding to the inlet pipe is to be cleaned, as shown in tables 1 and 2, wherein the NF/RO membrane unit is a nanofiltration/reverse osmosis integrated device and is communicated with the ultrafiltration clear liquid collection tank through the inlet pipe.
Fig. 2 is a comparison diagram of the inner walls of the water inlet pipes of the NF/RO membrane unit before and after cleaning in example 1 of the present invention, wherein (a) is before cleaning and (b) is after cleaning. As shown in the figure 2, before cleaning, a large amount of bacterial sludge is attached to the inner wall of the water inlet pipeline of the NF/RO membrane unit and the inner wall of the filter, and after cleaning by the method, most of the bacterial sludge attached to the inner wall of the water inlet pipeline of the NF/RO membrane unit and the inner wall of the filter is dissolved, and basically no bacterial sludge is attached, so that the cleaning effect is good, which shows that the method can clean the bacterial sludge bred on the inner wall of the water inlet pipeline of the NF/RO membrane unit.
In order to further verify the beneficial effects brought by the method, statistics is carried out on the filter bag replacement time before and after the pipeline cleaning, and the results are shown in table 1.
TABLE 1 statistical table of filter bag replacement before and after cleaning of water inlet pipes of different NF/RO membrane unit
Remarking: the scheduled time is 2018 during 6 months
As can be seen from Table 1, the frequency of replacement of the filter bags was high in the case of the NF/RO membrane unit (A2 and A3) which was not cleaned, wherein the frequency of replacement of the filter bags in A2 was as high as 4 times/day and the frequency of replacement of the filter bags in A3 was as high as 4 times/day. The replacement frequency of the filter bags in the NF/RO membrane units (A1 and A3) after cleaning is as low as 1 time per day. As can be seen by comparison, after the cleaning method disclosed by the invention is used for cleaning, the replacement frequency of the filter bag in the NF/RO membrane unit is obviously reduced, so that the operation cost and the treatment difficulty are favorably reduced.
To further verify the beneficial effects of the method of the present invention, statistics were performed on the pressures at both ends of the membrane in the NF/RO membrane unit (a1) before and after cleaning the pipeline, and the results are shown in table 2. In Table 2, pressure data at both ends of the membrane in the NF/RO membrane unit (A1) before and after the pipe cleaning was obtained by testing under the same test conditions.
TABLE 2 Experimental data on the influence of the cleaning process on the operating pressure of NF and RO membranes
Remarking: in Table 2, the experimental group was a cleaned NF/RO membrane unit, and the control group was an unwashed NF/RO membrane unit.
As can be seen from Table 2, NF1 and RO in the unwashed NF/RO membrane unit (control group)2And 2RO2The cumulative number of days of operation of (a) was 4 days, 8 days and 5 days, respectively, whereas in the cleaned NF/RO membrane unit (experimental group), NF1 and RO were present2And 2RO2The cumulative number of days of operation of (a) was 6 days, 7 days and 7 days, respectively. Compared with an NF/RO membrane unit which is not cleaned, the NF/RO membrane unit cleaned by the cleaning method has the advantages that the accumulated operation days are generally longer, the accumulated operation time is more stable, and the operation cost and the treatment difficulty are favorably reduced. In addition, as can be seen from Table 2, the pressure rise at both ends of the control group was 4.01bar or more, and the rise rate was as high as 1.26 bar/day, wherein NF1 and RO2And 2RO2The pressure rise values at two ends of the pressure sensor are respectively 4.28bar, 10.13bar and 4.01bar, and the rise rates are respectively 1.070 bar/day, 1.26 bar/day and 0.802 bar/day; the pressure rise value at two ends in the experimental group is below 1.47bar, the rise rate is as low as 0.21 bar/day, wherein NF1 and RO2And 2RO2The pressure rise values at the two ends of the pressure sensor are respectively 1.19bar, 1.47bar and 0.85bar, and the rise rates are respectively 0.198 bar/day, 0.210 bar/day and 0.121 bar/day. Compared with an NF/RO membrane unit which is not cleaned, the NF/RO membrane unit cleaned by the cleaning method has the advantages that the pressure rising values of two ends (front end and back end) of each membrane in the NF/RO membrane unit are lower, and the pressure rising rates of the two ends (front end and back end) are also lower, so that the treatment difficulty is favorably reduced, the treatment effect is favorably improved, and the design requirement can be more easily met.
The results in fig. 2, table 1 and table 2 show that the cleaning method of the invention can effectively remove bacterial sludge breeding on the inner wall of the water inlet pipe of the NF/RO membrane unit, inhibit bacterial breeding, reduce the replacement frequency of the filter bag of the filter at the front end of the NF/RO membrane, reduce the operation cost, prevent the NF/RO membrane element from being polluted by bacteria, improve the service life and the water production efficiency of the membrane, and has the advantages of simple process, easy operation, low treatment cost, high cleaning efficiency, good cleaning effect and the like, thereby meeting the actual treatment requirements and having good application value and application prospect.
The above examples are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.
Claims (5)
1. A method for cleaning bacterial sludge breeding on the inner wall of a water inlet pipeline of an NF/RO membrane unit is characterized by comprising the following steps:
s1, emptying residual sewage in the water inlet pipeline, and cleaning the inner wall of the water inlet pipeline by using water until the water quality chromaticity of the eluate is less than 10 times;
s2, after the step S1 is finished, the inner wall of the water inlet pipeline and the NF/RO membrane unit are circularly cleaned by adopting sodium bisulfite solution, so that the NF/RO membrane unit is soaked in the sodium bisulfite solution; the concentration of the sodium bisulfite solution is 8000 ppm-15000 ppm; the time of the circulating cleaning is 10 min-20 min;
s3, after the step S2 is finished, soaking the inner wall of the water inlet pipeline by adopting a cleaning agent; the soaking is to circulate the cleaning agent in the pipeline for 20min to 40min, stand and soak for 5min to 15min, and repeat the above operations for 3 to 6 times; the cleaning agent is sodium hypochlorite solution; the concentration of the effective chlorine in the sodium hypochlorite solution is 20 g/kg-40 g/kg; the pH value of the sodium hypochlorite solution is 10.5-12.5;
s4, after the step S3 is finished, cleaning the inner wall of the water inlet pipeline by water until the chlorine content in the eluate is less than 0.1 ppm;
and S5, after the step S4 is finished, the inner wall of the water inlet pipeline is circularly cleaned by adopting a neutralizing agent, and the cleaning of bacterial sludge breeding on the inner wall of the water inlet pipeline of the NF/RO membrane unit is completed.
2. The cleaning method according to claim 1, wherein in the step S5, the neutralizing agent is a sodium bisulfite solution or a reducing acidic solution; the reducing acidic solution is H2One of S solution, phosphite solution and hypophosphite solution.
3. The cleaning method according to claim 2, wherein the concentration of the sodium hydrogen sulfite solution is 8000ppm to 15000 ppm; said H2The concentration of the S solution is 0.4 mol/L-0.8 mol/L.
4. The cleaning method according to any one of claims 1 to 3, wherein the water is reclaimed water in the steps S1 and S4.
5. The cleaning method according to any one of claims 1 to 3, wherein in step S5, the time for the cyclic cleaning is 10 to 20 min.
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