CN214973115U - System for water yield promotion transformation of membrane system - Google Patents
System for water yield promotion transformation of membrane system Download PDFInfo
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- CN214973115U CN214973115U CN202023304934.4U CN202023304934U CN214973115U CN 214973115 U CN214973115 U CN 214973115U CN 202023304934 U CN202023304934 U CN 202023304934U CN 214973115 U CN214973115 U CN 214973115U
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Abstract
The utility model belongs to the technical field of sewage treatment, a system that water rate promotion was reformed transform is produced to membrane system is disclosed. The method comprises the following steps: and the effluent quality monitoring subsystem of the biological filter is used for monitoring the quality of the produced water of the membrane system in real time, if the quality of the produced water exceeds a threshold value, the ultrafiltration membrane pollution analysis subsystem is used for evaluating membrane pollution, the operation parameters of the membrane workshop backwashing dosing subsystem are formulated according to evaluation results, and then the membrane module is backwashed. The utility model discloses an evaluation and evaluation of milipore filter pollution analysis subsystem, and then formulate the operational parameter that adds the medicine subsystem to the backwash of membrane workshop to the real time monitoring of cooperation biological filter play water quality of water control subsystem, thereby realized the steady operation of membrane system.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, specifically, relate to a system that water rate promotion was reformed transform is produced to membrane system.
Background
At present, the fresh water resource is seriously in shortage, and an effective way for solving the problem is to recycle the domestic sewage, so that the method has very important significance for relieving the current situation of water resource shortage. The ultrafiltration membrane technology can effectively intercept particles with the particle size larger than the aperture of the ultrafiltration membrane in water, has the advantages of good water quality of produced water, small occupied area, stable operation, easy automatic control, no phase change, no secondary pollution and the like, and is greatly applied to the field of sewage recycling. However, in the long-term operation process of the membrane, inorganic particles and colloid viscous organic substances can be accumulated on the surface of the membrane, and are difficult to remove by simple cleaning, so that serious membrane pollution is gradually formed. Furthermore, the membrane fouling is exacerbated by membrane system and pretreatment design defects, human operator error, extensive and delayed operation and maintenance management, and the like. The main problems in the running process of the ultrafiltration process are the membrane flux reduction, transmembrane pressure difference increase, water quality reduction of produced water and the like caused by membrane fouling. However, with the continuous refinement of the operation management method, the test and evaluation are necessary to be performed through field sampling, and a more economical, reasonable and efficient cleaning method is sought, so that the method has important significance for maintaining the stable operation of the system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a membrane system water yield promotes system of reforming transform to prior art not enough. The utility model discloses an evaluation and evaluation of milipore filter pollution analysis subsystem, and then formulate the operational parameter that adds the medicine subsystem to the backwash of membrane workshop to the real time monitoring of cooperation biological filter play water quality of water control subsystem, thereby realized the steady operation of membrane system.
In order to realize the aim, the utility model provides a system for improving and transforming the water yield of a membrane system, which comprises an ultrafiltration membrane pollution analysis subsystem, a biological filter effluent water quality monitoring subsystem, a membrane workshop backwashing medicine adding subsystem and a plurality of membrane components;
the membrane workshop backwashing medicine adding subsystem comprises a plurality of medicine adding rooms, a plurality of medicine adding pumps, a plurality of flow meters, a plurality of backwashing electromagnetic valves, a plurality of backwashing pumps, a backwashing reservoir, a CIP cleaning circulating pump, a CIP cleaning electromagnetic valve and a CIP medicine adding tank;
the plurality of medicine dosing rooms are respectively connected with one ends of the plurality of medicine dosing pumps; the other ends of every two dosing pumps in the dosing pumps, one flow meter in the flow meters and one end of every two backwashing electromagnetic valves in the backwashing electromagnetic valves are sequentially connected; the other ends of the backwashing electromagnetic valves are respectively connected with the water inlet ends of the backwashing pumps; the water inlet ends of the backwashing pumps are also connected with the backwashing reservoir; each two water outlet ends of the plurality of backwashing pumps are connected to one membrane module in the plurality of membrane modules;
the other ends of the dosing pumps are also connected with the CIP cleaning electromagnetic valve, the CIP cleaning circulating pump and the membrane assemblies in sequence.
Preferably, the bottoms of the medicine dosing rooms are respectively connected with one ends of the medicine dosing pumps.
Preferably, the number of the medicine dosing rooms, the number of the medicine dosing pumps, the number of the backwashing electromagnetic valves and the number of the backwashing pumps are four, and the number of the flow meters is two.
Preferably, the membrane modules are two.
Preferably, the biological filter effluent quality monitoring subsystem comprises a filter effluent main channel, a plurality of nitrification filters, a plurality of water inlet pumps and a plurality of turbidity detection units; the plurality of water inlet pumps comprise a main channel water inlet pump and a plurality of branch channel water inlet pumps, and the plurality of turbidity detection units comprise a main channel turbidity detection unit and a plurality of branch channel turbidity detection units; the multiple nitrification filter tanks, the multiple sub-channel water inlet pumps and the multiple sub-channel turbidity detection units are sequentially connected; the filter tank water outlet main channel, the main channel water inlet pump and the main channel turbidity detection unit are sequentially connected.
Preferably, the turbidity detecting units each comprise a circulation water tank and a turbidity meter.
Preferably, the plurality of branch channel water inlet pumps are connected with the turbidity meters of the plurality of branch channel turbidity detecting units; the main canal water inlet pump is connected with a turbidity meter of the main canal turbidity detection unit.
Preferably, the plurality of nitrification filter tanks are also connected to the filter tank water outlet main channel.
Preferably, the number of the branch channel water inlet pump, the number of the nitrification filter and the number of the branch channel turbidity detection units are four. Preferably, the ultrafiltration membrane pollution analysis subsystem comprises a scanning electron microscope, an ICP-OES instrument, a three-dimensional fluorescence detector and a TOC detector.
The technical scheme of the utility model following beneficial effect has:
(1) the utility model discloses the biological filter of system goes out water quality monitoring subsystem and carries out quality of water on-line monitoring through the real-time sample of nitrifying the filtering pond and go out water and main canal, can guarantee the stability of membrane system operation.
(2) The utility model discloses to the actual conditions of each water works, utilize the advanced instrument and the detection method of milipore filter pollution analysis subsystem, detect the pollutant on membrane surface and resume the membrane performance through the different washing schemes, propose corresponding control strategy according to the analysis of data.
(3) The utility model discloses according to surpassingThe analysis result of the filter membrane pollution analysis subsystem is used for transforming the existing membrane workshop backwashing dosing system, operational parameters are formulated again, the backwashing process is accompanied with the cleaning of low-concentration sodium hypochlorite, the pollution of the ultrafiltration membrane is relieved, the cleaning period of a backwashing self-cleaning filter and the chemical cleaning period of the ultrafiltration membrane are prolonged, the stable operation of a membrane system is ensured (particularly under the condition that the membrane system is added with a carbon source in a front-end biological filter in winter), the water permeability attenuation speed of the membrane system is reduced, the recovery rate and the water yield of the membrane system are improved, namely the water yield of the membrane workshop is controlled by 7 ten thousand meters per day3Increase d to 9.5 km3/d。
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.
Fig. 1 shows a schematic diagram of a biological filter effluent quality monitoring subsystem of a system for improving and transforming a membrane system water yield according to embodiment 1 of the present invention.
Fig. 2 shows a schematic diagram of a membrane workshop backwash chemical feeding subsystem and a plurality of membrane modules of a system provided by embodiment 1 of the present invention for improving the water yield of a membrane system.
Fig. 3 shows a micro-topography of a membrane module observed from the surface topography of a membrane in a method for improving and transforming the water yield of a membrane system provided by embodiment 2 of the present invention.
Fig. 4 shows a water yield change chart before and after treatment by using the method for improving and transforming the water yield of a membrane system provided by embodiment 2 of the present invention.
The reference numerals are explained below:
1-medicine dosing room; 2-a dosing pump; 3-a flow meter; 4-backwashing the electromagnetic valve; 5-backwashing pump; 6-backwashing the reservoir; 7-CIP cleaning circulating pump; 8-CIP cleaning electromagnetic valve; 9-CIP dosing tank; 10-a membrane module; 11-a filter tank water outlet main channel; 12-a nitrification filter; 13-main channel water inlet pump; 14-a divided channel water inlet pump; 15-main canal turbidity detecting unit; 16-a divided channel turbidity detection unit.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The utility model provides a system for improving the water yield of a membrane system, which comprises an ultrafiltration membrane pollution analysis subsystem, a biological filter effluent water quality monitoring subsystem, a membrane workshop backwashing medicine adding subsystem and a plurality of membrane components;
the membrane workshop backwashing medicine adding subsystem comprises a plurality of medicine adding rooms, a plurality of medicine adding pumps, a plurality of flow meters, a plurality of backwashing electromagnetic valves, a plurality of backwashing pumps, a backwashing reservoir, a CIP cleaning circulating pump, a CIP cleaning electromagnetic valve and a CIP medicine adding tank;
the plurality of medicine dosing rooms are respectively connected with one ends of the plurality of medicine dosing pumps; the other ends of every two dosing pumps in the dosing pumps, one flow meter in the flow meters and one end of every two backwashing electromagnetic valves in the backwashing electromagnetic valves are sequentially connected; the other ends of the backwashing electromagnetic valves are respectively connected with the water inlet ends of the backwashing pumps; the water inlet ends of the backwashing pumps are also connected with the backwashing reservoir; each two water outlet ends of the plurality of backwashing pumps are connected to one membrane module in the plurality of membrane modules;
the other ends of the dosing pumps are also connected with the CIP cleaning electromagnetic valve, the CIP cleaning circulating pump and the membrane assemblies in sequence.
In the present invention, the cip (clean in place) cleaning is performed on-site.
In one example, the bottoms of the medicine dosing rooms are respectively connected with one ends of the medicine dosing pumps.
In one example, the number of the medicine dosing room, the number of the medicine dosing pumps, the number of the backwashing electromagnetic valves and the number of the backwashing pumps are four, and the number of the flow meters is two.
In one example, the membrane modules are two.
In one example, the biological filter effluent quality monitoring subsystem comprises a filter effluent main channel, a plurality of nitrification filters, a plurality of water inlet pumps and a plurality of turbidity detection units; the plurality of water inlet pumps comprise a main channel water inlet pump and a plurality of branch channel water inlet pumps, and the plurality of turbidity detection units comprise a main channel turbidity detection unit and a plurality of branch channel turbidity detection units; the multiple nitrification filter tanks, the multiple sub-channel water inlet pumps and the multiple sub-channel turbidity detection units are sequentially connected; the filter tank water outlet main channel, the main channel water inlet pump and the main channel turbidity detection unit are sequentially connected.
In one example, the turbidity detection units each comprise a circulation water tank and a turbidity meter.
In one example, the plurality of sub-channel water inlet pumps are connected with turbidity meters of the plurality of sub-channel turbidity detecting units; the main canal water inlet pump is connected with a turbidity meter of the main canal turbidity detection unit.
In one example, the plurality of nitrification filter tanks are also all connected to the filter tank water outlet main channel.
In one example, the number of the branch channel water inlet pump, the number of the nitrification filter and the number of the branch channel turbidity detection units are four.
Preferably, the ultrafiltration membrane pollution analysis subsystem comprises a scanning electron microscope, an ICP-OES instrument, a three-dimensional fluorescence detector and a TOC detector.
The utility model also provides a method that membrane system water yield promoted transformation, this method adopts membrane system water yield promote transformation's system, include following step: the system is characterized in that the effluent quality monitoring subsystem of the biological filter is utilized to monitor the quality of the membrane system produced water in real time, if the quality of the produced water exceeds a threshold value, the ultrafiltration membrane pollution analysis subsystem is utilized to evaluate membrane pollution, the operation parameters of the membrane workshop backwashing dosing subsystem are formulated according to evaluation results, and then the membrane module is backwashed, and the method comprises the following steps:
s1: backwashing the membrane module: the backwashing electromagnetic valves, the dosing pumps and the dosing pumps are sequentially opened, the membrane assembly is backwashed, and after the backwashing is finished, the backwashing pumps, the backwashing electromagnetic valves and the dosing pumps are sequentially closed;
s2: performing CIP cleaning on the membrane module: sequentially opening the plurality of dosing pumps, the CIP cleaning electromagnetic valve and the CIP cleaning circulating pump to clean the membrane component in a CIP manner; and after the CIP cleaning is finished, closing the CIP cleaning circulating pump, the CIP cleaning electromagnetic valve and the plurality of dosing pumps in sequence.
In the utility model, when the step S1 of backwashing the membrane module is started, the step S2 of cleaning the membrane module by CIP is closed; when the step S2 of CIP cleaning the membrane module is started, the step S1 of backwashing the membrane module is closed in order to ensure the dosage of each step.
In the utility model discloses, in step S1 to the membrane module is carried out the backwash, the purpose that the dosing pump is prior to the backwash pump starts is in order to guarantee when the backwash pump starts that the interior medicament of dosing pipeline is full of pipe, as preferred scheme, the dosing pump is prior to the backwash pump starts 5S.
In one example, the step of monitoring the quality of the membrane system produced water by the biological filter effluent quality monitoring subsystem comprises taking water from the filter effluent main channel by the main channel water inlet pump and conveying the water to the main channel turbidity detection unit, and taking water from the nitrification filters by the branch channel water inlet pumps and conveying the water to the branch channel turbidity detection units.
In one example, the threshold is adjusted according to the field situation, preferably 9.5-10.5NTU, and more preferably 10 NTU.
In one example, the evaluation of membrane fouling by the ultrafiltration membrane fouling analysis subsystem includes analysis of membrane system fouling materials, membrane wire performance analysis, and membrane system performance cleaning recovery analysis.
In one example, the analysis of the membrane system contaminants includes membrane surface topography observation, membrane surface inorganic contaminant analysis, and membrane surface organic contaminant analysis.
In one example, the step of observing the surface topography of the membrane comprises the steps of respectively cleaning membrane silk pollutants of the membrane module by using hydrochloric acid and NaOH solutions, and respectively observing the microscopic topography of the membrane module before cleaning, the membrane module after hydrochloric acid cleaning and the membrane module after NaOH solution cleaning by using the scanning electron microscope.
In one example, the step of analyzing the inorganic pollutants on the membrane surface comprises the steps of respectively cleaning membrane silk pollutants of the membrane module by using hydrochloric acid and NaOH solutions, and respectively detecting the cleaned hydrochloric acid pollutant mixed solution and the cleaned NaOH pollutant mixed solution by using the ICP-OES instrument.
In one example, the step of analyzing the organic pollutants on the membrane surface comprises the steps of respectively cleaning membrane silk pollutants of the membrane module by using hydrochloric acid and NaOH solutions, respectively detecting the type of the organic pollutants of the membrane module cleaned by using hydrochloric acid and the type of the organic pollutants of the membrane module cleaned by using NaOH solutions by using the three-dimensional fluorescence detector, and respectively detecting the content of the organic pollutants of the membrane module cleaned by using hydrochloric acid and the content of the organic pollutants of the membrane module cleaned by using NaOH solutions by using a TOC detector.
In one example, the film filament performance analysis includes analysis of contact angle, tensile force at break, tensile strength at break, deformation, and elongation at break.
In one example, the step of analyzing the contact angle includes washing membrane filament pollutants of the membrane module with a NaClO solution and a citric acid solution, and detecting the contact angles of the membrane module before washing, the membrane module after washing with the NaClO solution, and the membrane module after washing with the citric acid solution.
In one example, the concentration of the NaClO solution is 2500-3500ppm, the mass percentage of the citric acid in the citric acid solution is 1-3%, and the cleaning time of the NaClO solution and the cleaning time of the citric acid solution are both 3-5 h.
In one example, the membrane system performance cleaning recovery analysis step includes cleaning membrane filament contaminants of the membrane module with an acid-base combination reagent and comparing membrane flux before and after cleaning. In one example, the acid-base solution combined agent is a combination of NaClO solution + citric acid solution, a combination of NaClO solution + oxalic acid solution or a combination of NaClO solution + NaOH solution + oxalic acid solution; in each acid-base combination, the concentration of the NaClO solution is 2500-3500ppm, the mass percent of citric acid in the citric acid solution is 1-3%, and the mass percent of oxalic acid in the oxalic acid solution is 1-3%.
In one example, the step of washing the membrane silk pollutants of the membrane module with the acid-base combined medicament comprises washing the membrane silk pollutants of the membrane module with the alkali solution medicament and the acid solution medicament in sequence, wherein the washing time of each solution medicament is 3-5 h.
In one example, the operating parameters of the membrane shop backwash dosing subsystem are: the medicine in the medicine dosing room is NaClO solution, and the concentration of the NaClO solution is 0-50 ppm; the flow rate of each NaClO solution is 650-750L/h, the backwashing time is 20-40min, the backwashing frequency of the step 1 is 36-72 times/day, and the daily dosage of NaClO for backwashing each membrane module is 2.4-2.8m3。
In one example, the CIP cleaning time period of step 2 is 90-180min, the CIP cleaning of step 2 is performed every three days, and the amount of NaClO used to backwash each membrane module is 2500 ppm.
The present invention will be described in detail with reference to examples.
In the following examples, the ultrafiltration membrane was purchased from Beijing Bibi water source membrane technologies, Inc.
Example 1
The embodiment provides a system for improving and transforming the water yield of a membrane system, and as shown in fig. 1 and 2, the system comprises an ultrafiltration membrane pollution analysis subsystem, a biological filter effluent water quality monitoring subsystem, a membrane workshop backwashing medicine feeding subsystem and two membrane modules 10;
the membrane workshop backwashing medicine adding subsystem comprises four medicine adding rooms 1, four medicine adding pumps 2, two flow meters 3, four backwashing electromagnetic valves 4, four backwashing pumps 5, a backwashing water reservoir 6, a CIP cleaning circulating pump 7, a CIP cleaning electromagnetic valve 7 and a CIP medicine adding tank 9;
the four medicine dosing rooms 1 are respectively connected with one ends of the four medicine dosing pumps 2; the other ends of every two dosing pumps 2, one flowmeter 3 and one end of every two backwashing electromagnetic valves 4 are connected in sequence; the other ends of the four backwashing electromagnetic valves 4 are respectively connected with the water inlet ends of the four backwashing pumps 5; the water inlet ends of the four backwashing pumps 5 are also connected with the backwashing reservoir 6; every two water outlet ends of the four backwashing pumps 5 are connected to one membrane component 10;
the other ends of the four dosing pumps 2 are also connected with the CIP cleaning electromagnetic valve 8, the CIP cleaning circulating pump 7 and the membrane modules 10 in sequence.
The biological filter effluent quality monitoring subsystem comprises a filter effluent main channel 11, four nitrification filters 12, five water inlet pumps and five turbidity detection units; the five water inlet pumps comprise a main channel water inlet pump 13 and four branch channel water inlet pumps 14, and the five turbidity detection units comprise a main channel turbidity detection unit 15 and four branch channel turbidity detection units 16; the four nitrification filter chambers 12, the four sub-channel water inlet pumps 14 and the four sub-channel turbidity detection units 16 are sequentially connected; the filter tank water outlet main channel 11, the main channel water inlet pump 13 and the main channel turbidity detection unit 15 are sequentially connected;
the turbidity detection units respectively comprise a circulating water tank and a turbidity meter. Neither the circulation tank nor the turbidity meter is shown.
The ultrafiltration membrane pollution analysis subsystem comprises a scanning electron microscope, an ICP-OES instrument, a three-dimensional fluorescence detector and a TOC detector. The scanning electron microscope, ICP-OES instrument, three-dimensional fluorescence detector and TOC detector are not shown.
Example 2
The embodiment provides a method for improving and transforming the water yield of a membrane system, which adopts the system for improving and transforming the water yield of the membrane system described in embodiment 1, and comprises the following steps: the system is characterized in that the effluent quality monitoring subsystem of the biological filter is utilized to monitor the quality of the membrane system produced water in real time, if the quality of the produced water exceeds a threshold value, the ultrafiltration membrane pollution analysis subsystem is utilized to evaluate membrane pollution, the operation parameters of the membrane workshop backwashing dosing subsystem are formulated according to evaluation results, and then the membrane module is backwashed, and the method comprises the following steps:
s1: backwashing the membrane module: sequentially opening the four backwashing electromagnetic valves 4, the four dosing pumps 2 and the four backwashing pumps 5, backwashing the membrane assembly, and sequentially closing the four backwashing pumps 5, the four backwashing electromagnetic valves 4 and the four dosing pumps 2 after backwashing is finished;
s2: performing CIP cleaning on the membrane module: sequentially opening the four dosing pumps 2, the CIP cleaning electromagnetic valve 8 and the CIP cleaning circulating pump 7 to clean the membrane component in a CIP manner; and after the CIP cleaning is finished, the CIP cleaning circulating pump 7, the CIP cleaning electromagnetic valve 8 and the four dosing pumps 2 are closed in sequence.
In this embodiment, when the membrane module backwashing step S1 is started, the membrane module CIP cleaning step S2 is closed; when the step S2 of CIP cleaning the membrane module is started, the step S1 of backwashing the membrane module is closed. In step S1 of backwashing the membrane module, the dosing pump is started 5S before the backwash pump.
The step of utilizing the biological filter effluent quality monitoring subsystem to monitor the quality of the membrane system produced water comprises the steps of utilizing the main channel water inlet pump to take water from the filter effluent main channel and convey the water to the main channel turbidity detection unit, utilizing the plurality of sub-channel water inlet pumps to respectively take water from the plurality of nitrification filters and convey the water to the plurality of sub-channel turbidity detection units;
the threshold is 10 NTU.
The evaluation of the ultrafiltration membrane pollution analysis subsystem on membrane pollution comprises the analysis of membrane system pollutants, the performance analysis of membrane filaments and the cleaning and recovery analysis of the membrane system performance.
The analysis of the membrane system pollutants comprises the observation of the surface appearance of the membrane, the analysis of inorganic pollutants on the surface of the membrane and the analysis of organic pollutants on the surface of the membrane;
the step of observing the membrane surface morphology comprises the steps of respectively cleaning membrane silk pollutants of the membrane assembly by using hydrochloric acid and NaOH solutions, and respectively observing the microscopic morphologies of the membrane assembly before cleaning, the membrane assembly after cleaning by using hydrochloric acid and the membrane assembly after cleaning by using the NaOH solution, as shown in fig. 3, it can be found from fig. 3 that a large amount of pollutants exist on the surface of the membrane assembly before cleaning (an original membrane is not cleaned), and the membrane pores which are partially blocked are recovered after cleaning, and the cleaning effect by using the NaOH solution is better, so that the membrane pores are considered to be better recovered by adopting an acid-base alternating mode for cleaning when the membrane assembly is backwashed.
The step of analyzing the inorganic pollutants on the membrane surface comprises the steps of respectively cleaning membrane wire pollutants of the membrane component by using hydrochloric acid and NaOH solutions, and respectively detecting the cleaned hydrochloric acid pollutant mixed solution and the cleaned NaOH pollutant mixed solution by using the ICP-OES instrument, wherein the detection results are shown in Table 1.
TABLE 1 analysis of inorganic contaminants on the surface of the membrane
The step of analyzing the organic pollutants on the membrane surface comprises the steps of respectively utilizing hydrochloric acid and NaOH solution to clean membrane silk pollutants of the membrane component, and respectively utilizing the three-dimensional fluorescence detector to clean the type of the organic pollutants of the membrane component cleaned by the hydrochloric acid and the NaOH solutionThe type of the organic pollutants of the membrane module is detected, the TOC detector is used for respectively detecting the content of the organic pollutants of the membrane module cleaned by hydrochloric acid and the content of the organic pollutants of the membrane module cleaned by NaOH solution, the detection results are shown in tables 2 and 3, the TOC and three-dimensional fluorescence results can show that the organic pollutants on the surface of the membrane filaments are mainly protein and microbial metabolites, and the content of the chemically cleanable organic pollutants is respectively as follows: 1670mg/m2And 2016mg/m2It shows that a large amount of organic pollutants are attached to the surface of the membrane, and alkaline cleaning is better than acid cleaning.
Table 2 organic pollutants analysis (three-dimensional fluorescence)
| Cleaning agent | I |
|
III Fulic acid | IV microbial metabolites | Humic acid V |
| Hydrochloric acid | 39.01％ | 21.79％ | 16.64％ | 14.45％ | 8.11％ |
| Sodium hydroxide | 17.36％ | 25.31％ | 10.57％ | 35.00％ | 11.74％ |
TABLE 3 organic contaminants content analysis (TOC)
| Cleaning agent | Organic pollutant content |
| Hydrochloric acid | 1670mg/m2 |
| Sodium hydroxide | 2016mg/m2 |
The film yarn performance analysis comprises the analysis of contact angle, breaking tensile force, breaking tensile strength, deformation and breaking elongation;
the contact angle analysis step comprises the steps of respectively cleaning membrane silk pollutants of the membrane assembly by using a NaClO solution and a citric acid solution, and respectively detecting the contact angles of the membrane assembly before cleaning, the membrane assembly after cleaning with the NaClO solution and the membrane assembly after cleaning with the citric acid solution, wherein the detection results are shown in table 4.1, the concentration of the NaClO solution is 3000ppm, the mass percentage of citric acid in the citric acid solution is 2%, and the cleaning time of the NaClO solution and the cleaning time of the citric acid solution are both 4 h. As can be seen from table 4.1, the contaminants are gradually removed and the hydrophilicity gradually improves. As shown in Table 4.2, the average breaking tensile force of the membrane module before and after cleaning is 2.71N, which is the mechanical property of the conventional wet ultrafiltration membrane wire.
TABLE 4.1 Membrane filament Performance analysis
| Membrane module | Contact angle |
| Before cleaning | 92.4 |
| Soaking in NaClO (3000ppm) for 4h | 94.2 |
| Soaking in citric acid (2%) for 4 hr | 87.3 |
TABLE 4.2 Membrane filament Performance analysis
| Membrane module | Tensile force at break (N) | Tensile Strength at Break (MPa) | Deformation (mm) | Elongation at break |
| Mean value of | 2.71 | 2.87 | 106.95 | 71％ |
The membrane system performance cleaning recovery analysis step comprises the steps of cleaning membrane silk pollutants of the membrane module by using an acid-base combined medicament, and comparing membrane flux before and after cleaning;
in the embodiment, three acid-base solution combined agents are adopted for cleaning, namely a cleaning scheme 1 combining a NaClO solution and a citric acid solution, a cleaning scheme 2 combining a NaClO solution and an oxalic acid solution and a cleaning scheme 3 combining a NaClO solution, a NaOH solution and an oxalic acid solution; in each acid-base combination, the concentration of the NaClO solution is 3000ppm, the mass percent of citric acid in the citric acid solution is 2%, and the mass percent of oxalic acid in the oxalic acid solution is 2%;
the step of cleaning the membrane silk pollutants of the membrane component by using an acid-base combined medicament comprises the step of cleaning the membrane silk pollutants of the membrane component by using an alkali solution medicament and an acid solution medicament in sequence, wherein the cleaning time of each solution medicament is 4 hours;
the results of the membrane flux after the cleaning schemes 1, 2, and 3 are shown in table 5, and it can be seen from table 5 that the membrane flux before cleaning is about 50LMH, the effect is better after sodium hypochlorite cleaning, the flux is recovered to about 150LMH, and the flux is recovered to about 270LMH after citric acid cleaning. It can be seen that the membrane filaments under long-term accumulated pollution are seriously polluted by both organic pollution and inorganic pollution. As shown in table 5, this example mainly refers to the flux multiple after the comparative cleaning compared to before the cleaning, i.e., the average flux change.
TABLE 5 Membrane flux results after washing
According to the results, the operation parameters of the membrane workshop backwashing dosing subsystem are provided as follows: the medicine in the medicine dosing room is NaClO solution, and the concentration of the NaClO solution is 50 ppm; the flow rate of each NaClO solution is 700L/h, the backwashing time is 30min, the backwashing frequency of the step 1 is 48 times/day, and the daily dosage of NaClO for backwashing each membrane component is 2.6m3；
The CIP cleaning time of the step 2 is 90-180min, the CIP cleaning of the step 2 is carried out every three days, and the using amount of NaClO for backwashing each membrane module is 2500ppm m 3.
The change of the membrane shop water yield after the membrane module is subjected to backwashing is shown in fig. 4, the membrane shop water yield before the dotted line (i.e. the position close to the ordinate) is the membrane shop water yield without backwashing, the membrane shop water yield after the dotted line (i.e. the position far away from the ordinate) is the membrane shop water yield after backwashing, as can be seen from fig. 4, the ordinate represents the membrane shop water yield, and the abscissa represents time, and after backwashing is performed by the method of the embodiment, the membrane shop water yield is 7 ten thousand meters per day3Increase of d to 11 km3/d。
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A system for improving and transforming the water yield of a membrane system is characterized by comprising an ultrafiltration membrane pollution analysis subsystem, a biological filter effluent water quality monitoring subsystem, a membrane workshop backwashing medicine adding subsystem and a plurality of membrane modules;
the membrane workshop backwashing medicine adding subsystem comprises a plurality of medicine adding rooms, a plurality of medicine adding pumps, a plurality of flow meters, a plurality of backwashing electromagnetic valves, a plurality of backwashing pumps, a backwashing reservoir, a CIP cleaning circulating pump, a CIP cleaning electromagnetic valve and a CIP medicine adding tank;
the plurality of medicine dosing rooms are respectively connected with one ends of the plurality of medicine dosing pumps; the other ends of every two dosing pumps in the dosing pumps, one flow meter in the flow meters and one end of every two backwashing electromagnetic valves in the backwashing electromagnetic valves are sequentially connected; the other ends of the backwashing electromagnetic valves are respectively connected with the water inlet ends of the backwashing pumps; the water inlet ends of the backwashing pumps are also connected with the backwashing reservoir; each two water outlet ends of the plurality of backwashing pumps are connected to one membrane module in the plurality of membrane modules;
the other ends of the dosing pumps are also connected with the CIP cleaning electromagnetic valve, the CIP cleaning circulating pump and the membrane assemblies in sequence.
2. The system of claim 1, wherein the bottoms of the plurality of chemical dosing chambers are connected to one end of the plurality of dosing pumps, respectively.
3. The system for improving and transforming the water yield of a membrane system according to claim 1, wherein the number of the medicine dosing room, the dosing pump, the backwashing solenoid valve and the backwashing pump is four, and the number of the flow meters is two.
4. The system water production rate upgrading system of claim 3, wherein the membrane modules are two.
5. The system for improving and modifying the water yield of a membrane system according to claim 1, wherein the biological filter effluent water quality monitoring subsystem comprises a filter effluent main channel, a plurality of nitrification filters, a plurality of water inlet pumps and a plurality of turbidity detection units; the plurality of water inlet pumps comprise a main channel water inlet pump and a plurality of branch channel water inlet pumps, and the plurality of turbidity detection units comprise a main channel turbidity detection unit and a plurality of branch channel turbidity detection units; the multiple nitrification filter tanks, the multiple sub-channel water inlet pumps and the multiple sub-channel turbidity detection units are sequentially connected; the filter tank water outlet main channel, the main channel water inlet pump and the main channel turbidity detection unit are sequentially connected.
6. The system of claim 5 wherein the turbidity sensing units each comprise a circulating water tank and a turbidity meter.
7. The system of membrane system water production rate upgrading system of claim 6, wherein the plurality of sub-channel water inlet pumps are connected to the turbidity meters of the plurality of sub-channel turbidity detection units; the main canal water inlet pump is connected with a turbidity meter of the main canal turbidity detection unit.
8. A system for membrane system water production rate upgrading according to claim 5, wherein the plurality of nitrification filter tanks are also all connected to the filter tank main water channel.
9. The system for improving the water yield of a membrane system according to claim 5, wherein the number of the sub-channel water inlet pump, the nitrification filter and the sub-channel turbidity detection unit is four.
10. The system of claim 1 wherein the ultrafiltration membrane fouling analysis subsystem comprises a scanning electron microscope, an ICP-OES instrument, a three-dimensional fluorescence detector, and a TOC detector.
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