JP4518962B2 - Membrane filtration device - Google Patents

Description

  The present invention relates to a membrane filtration device for separating and removing impurities contained in raw water, and more particularly to a technique suitable for detecting a membrane module in which an abnormality has occurred during normal filtration operation.

  The membrane filtration device is a device that separates and removes impurities by filtering inflow water. For example, the microfiltration membrane has pores of about 0.1 to 5.0 μm and can remove turbid particles and microorganisms. The filtration membrane is about several to several tens of nanometers and can remove colloids, polymer substances and the like. In general, the membrane filtration apparatus has a configuration in which two or more series of membrane modules are arranged in preparation for maintenance, accidents, and the like.

  Here, when the operation of the membrane filtration device is continued, it is considered that the clogging of the membrane increases as the filtration time elapses and the transmembrane pressure rises. For this reason, it is necessary to repeat physical cleaning and chemical cleaning for restoring the performance of the membrane at an appropriate frequency. Physical cleaning includes, for example, a method of backwashing filtered water or air from the secondary side of the module, and a cleaning time of about 15 to 30 seconds is often seen with respect to a filtering time of about 30 to 90 minutes. However, if the film performance does not return to a predetermined value even after performing physical cleaning, chemical cleaning is performed. Since various chemicals such as alkalis, acids, organic acids, and detergents are used for chemical cleaning, film deterioration due to chemical changes is inevitable. If the transmembrane pressure difference does not return to a predetermined value even after chemical cleaning is performed, the deteriorated membrane module is replaced.

  Since the membrane module is repeatedly subjected to normal filtration operation, physical cleaning, and chemical cleaning, it gradually deteriorates, and in the worst case, it breaks. As a result, since there is a high risk of turbidity and pathogenic microorganisms leaking from the membrane breakage part, a device for detecting breakage in the membrane filtration device is essential. However, in medium and large-scale facilities, membrane filtration devices consist of several tens to several hundreds of membrane modules as one system, and several tens of systems as one device. Identification and detection are indispensable for obtaining safe and stable filtered water.

  In Patent Document 1, a series of a plurality of membrane modules is further provided, and a turbidity meter for leak detection is provided at the merging destination of filtrate water of each membrane module, and the series or membrane modules are sequentially installed. A method for detecting a membrane module that breaks and leaks turbidity from a plurality of membrane modules based on a relative change in turbidity while stopping is described.

  In addition, in Patent Document 2, as a method of detecting a broken membrane module, a sensor is provided for each membrane module, or in units of several to several tens of membrane modules, for the concentration, turbidity, and chromaticity of membrane filtrate water, A method for detecting an abnormality in a membrane process based on sensor measurements is described.

Patent Document 3 discloses a method for detecting breakage of a membrane module from the amount of air passing through the membrane or the air differential pressure at the membrane inlet / outlet after the filtration operation of the membrane module is stopped, and a membrane module that has been broken Is described in a plurality of membrane module units (group units). This is characterized in that even if a small membrane breakage is detected, air is sequentially supplied to each membrane module series unit to detect a membrane module that is broken from the amount of air flowing out and the pressure.
JP-A-9-108550 JP-A-10-128086 JP 2000-93765 A

  Until now, in order to detect the breakage of the membrane module, methods shown in Patent Documents 1 to 3 have been proposed. However, in these methods, it takes a great amount of time to identify the broken module while sequentially stopping several tens to several hundreds of membrane modules. In addition, an air supply source that is not required for the operation of the membrane filtration device, instrumentation such as an air valve, an air flow meter, and a pressure gauge is required, and expensive and complicated incidental equipment is required in addition to normal filtration operation and cleaning. It becomes. Alternatively, applying air pressure regularly may promote damage to the membrane module, deterioration of the membrane itself, deterioration of the seal, and the like. Thus, it is difficult to efficiently detect a broken membrane module without hindering normal operation.

The present invention comprises one or more membrane module series in which one or more membrane modules constitute one series of membrane module series, the raw water flowing from the primary side is filtered, and the filtered water flows out from the secondary side. Cleaning history recording means for recording the history of the number of cleanings of the membrane module, turbidity reference value recording means for recording a predetermined turbidity reference value, and turbidity measurement for measuring the turbidity of the filtered water of the membrane module and means, and control means for controlling the water flow of the membrane module, compares the filtered water turbidity and predetermined turbidity standard value for each membrane module series, the determination of the fracture detection of membrane modules included in a membrane module series The determination means to perform and the break detection means which determines the order which carries out the break detection of the membrane module from the log | history of the frequency | count of washing | cleaning, and detects the broken membrane module according to this order .

  An object of this invention is to detect the membrane module which fractured | ruptured at the time of normal filtration operation at an early stage.

  The present invention, when provided with a plurality of membrane modules, cleaning history recording means for recording the history of the number of cleaning times of the plurality of membrane modules, turbidity reference value recording means for recording a predetermined turbidity reference value, The turbidity measuring means for measuring the filtered water turbidity of the membrane module, the control means for controlling the water flow of the plurality of membrane modules, and comparing the filtered water turbidity with a predetermined turbidity reference value, A determination means for performing determination, and when the determination means detects breakage, based on the history of the number of cleaning times, identifies a broken membrane module from among a plurality of membrane modules, and a breakage detection means for detecting the identified membrane module; Is provided.

  According to the present invention, in a membrane filtration apparatus composed of a plurality of membrane modules, a broken membrane module can be detected at an early stage, so that a decrease in the amount of filtrate can be minimized, and as a result, filtrate water that satisfies a predetermined water quality standard. Can be stably supplied.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In this embodiment, the present invention is applied to a membrane filtration apparatus that performs a membrane filtration process to separate and remove impurities, measures turbidity, and performs valve closure according to the load of the membrane module. Below, the example of a structure and operation | movement of this membrane filtration apparatus is demonstrated.

First, the structural example of the membrane filtration apparatus of this example is demonstrated. FIG. 1 is a block diagram showing a configuration example of the membrane filtration device of this example. The membrane filtration device is divided into a membrane filtration device 100 that filters raw water or a membrane module, and a control unit 101 that detects breakage from the measured turbidity and issues a valve opening / closing instruction.
<Normal operation>
First, the configuration will be described along the flow of supplied water during normal operation. In normal operation, the filtered water 2 from which turbidity has been removed is produced by passing the membrane filtration device 100 with respect to the supply water 1 supplied as raw water using all the membrane module series. First, the feed water 1 is pumped out by the feed water pump 6, passes through the feed water inlet valve 12 that controls the inflow of the feed water 1, and controls the inflow to the membrane module series 21 a and 21 b having a plurality of membrane modules. It is supplied to the filtration inlet valves 13a and 13b. Membrane module series 21a and 21b store membrane modules 8a1 to 8an and 8b1 to 8bn, respectively, and membrane module valves 14a1 to 14an and 14b1 to 14bn for performing filtration processing control on the respective membrane modules. is set up. The feed water 1 that has passed through the filtration inlet valves 13a and 13b is subjected to membrane filtration treatment by the membrane module series 21a and 21b, and then supplied as filtration water 2 to filtration outlet valves 16a and 16b that control the outflow of filtrate water. The The filtered water 2 passes through the filtration outlet valves 16a and 16b, and a part of the filtered water is stored in the water storage tank 11 and then sent to a subsequent process (not shown). The water storage tank 11 is a tank installed in order to ensure a constant water supply amount even during the filtration detection of the membrane module to be inspected in the break detection process described later. Further, the turbidity of the filtrate 2 is measured by a turbidimeter 9.

  In normal operation, the supply water inlet valve 12, the filtration inlet valves 13a and 13b, the membrane module valves 14a1 to 14an and 14b1 to 14bn, and the filtration outlet valves 16a and 16b are all in an “open” state, and all other cases are “closed”. It is as a state.

<Membrane module cleaning>
Next, the configuration will be described along the flow of cleaning water when the membrane module is cleaned. In physical cleaning, for example, there is a method of backwashing filtered water or air from the secondary side of the module. First, the washing water 4 for backflow washing pumped out by the physical washing pump 7 passes through the physical washing valve 17 that controls the inflow of the washing water 4 and then enters the membrane module series 21a and 21b from the filtration outlet valves 16a and 16b. Supplied. The washing water 4 passes through the membrane module valves 14a1 to 14an and 14b1 to 14bn, and backwashes the membrane modules 8a1 to 8an and 8b1 to 8bn, and then passes through the filtration inlet valves 13a and 13b of the membrane module series 21a and 21b. It is drained to the outside as a cleaning drainage 5 through a cleaning drainage valve 19 that controls the discharge of the cleaning drainage.

  In the physical cleaning, the physical cleaning valve 17 and the cleaning drain valve 19 are “open”. In the filtration outlet valves 16a and 16b, the membrane module valves 14a1 to 14an, 14b1 to 14bn, and the filtration inlet valves 13a and 13b, only the membrane module that performs physical cleaning or the valve having the membrane module series is set to “open”, and the others “Closed”. All remaining valves are “closed”.

  On the other hand, in chemical cleaning, a chemical 20 using an alkali, acid, organic acid, detergent, or the like passes through a chemical cleaning valve 18 that controls the inflow of the chemical 20 and passes through the membrane outlet series 16a from the filtration outlet valves 16a and 16b. , 21b. The chemical 20 passes through the membrane module valves 14a1 to 14an and 14b1 to 14bn, cleans the membrane modules 8a1 to 8an and 8b1 to 8bn, and then passes through the filtration inlet valves 13a and 13b of the membrane module series 21a and 21b. The water is discharged to the outside as the cleaning waste water 5 through the drain valve 19.

  In the chemical cleaning, the chemical cleaning valve 18 and the cleaning drain valve 19 are “open”. In the filtration outlet valves 16a and 16b, the membrane module valves 14a1 to 14an, 14b1 to 14bn, and the filtration inlet valves 13a and 13b, only the membrane module that performs chemical cleaning or the valve having the membrane module series is set to “open”, and the others “Closed”. All remaining valves are “closed”.

<Break detection>
Next, the configuration will be described along the flow at the time of break detection performed when break is detected in regular or normal operation. First, the supply water 1 supplied by the supply water pump 6 is supplied to the membrane modules 8a1 to 8an and 8b1 to 8bn through the supply water inlet valve 12 and the filtration inlet valves 13a and 13b. In the membrane filtration device of this example, it is possible to carry out break detection and normal operation in parallel for each module series, and the filtration drainage 3 in any of the membrane module series 21a, 21b where break detection is performed is broken. Turbidity is measured by the turbidimeter 10 through one of the breakage detection valves 15a and 15b for controlling drainage at the time of detection, and drained to the outside. On the other hand, the membrane module series filtrated water 2 that performs normal operation is measured for turbidity by the turbidimeter 9 through one of the filtration outlet valves 16a and 16b, and is sent to a subsequent treatment facility (not shown). In break detection, each valve is controlled to open and close as the process proceeds.

<Configuration of control unit 101>
Next, the configuration of the control unit 101 that detects breakage and controls the opening / closing of the valve will be described. The control part 101 is installed with respect to the membrane filtration apparatus 100 of this example. The turbidity of the filtered water 2 and the filtered waste water 3 is obtained from the turbidimeters 9 and 10 and supplied to the determination unit 102. The determination unit 102 determines whether the normal operation can be continued by comparing the reference value turbidity S preset in the turbidity reference value database 106 and the turbidity measured by the turbidimeter 9 or 10, If it is determined that the module has not broken, normal operation is performed. In the case of normal operation, the normal operation control unit 104 issues a valve opening / closing instruction for the membrane filtration device 100, and the valve opening / closing control unit 105 continues the valve open / closed state. When a break is detected, a “break” signal is output to the break detection unit 103.

Upon receiving the “break” signal, the break detecting unit 103 determines the detection order of the membrane modules in accordance with the total number of times of the valve opening / closing count Mi, which will be described later, or the total number of times of the cleaning history database 107 in which the cleaning history total Mj is recorded. The reference value turbidity S and the turbidity measured by the turbidimeter 10 are compared to detect a broken membrane module. Thereafter, a valve opening / closing instruction is output to the valve opening / closing control unit 105 for the broken membrane module and the other membrane modules, and the opening / closing of each valve instructed by the breaking detection unit 103 is executed. The number of times of opening / closing the filtration outlet valves 16a and 16b and the membrane module valves 14a1 to 14an and 14b1 to 14bn opened and closed by physical cleaning or chemical cleaning is recorded in the cleaning history database 107 as physical cleaning times or chemical cleaning times. The

<Recording method in cleaning history database 107>
Next, a recording process of the valve opening / closing total Mi and the cleaning total Mj to the cleaning history database 107 will be described. Let Pi be the number of opening and closing of the filtration outlet valves 16a and 16b for each membrane module series when physical cleaning is performed, and Ci be the number of opening and closing of the valve when chemical cleaning is performed. Here, i is 16a and 16b. The coefficient when the physical cleaning is performed is W1, and the coefficient when the chemical cleaning is performed is W2. Since the load on the membrane module is larger when chemical cleaning is performed than when physical cleaning is performed, W1 <W2. The total Mi of the valve opening / closing times of the filtration outlet valves 16a and 16b is calculated as the sum of each valve opening / closing number multiplied by a coefficient, and the calculation process of the following equation (1) is performed and recorded in the cleaning history database 107.
Mi (total number of valve opening / closing times) = (number of physical cleaning valve opening / closing times) x (physical cleaning coefficient) + (chemical cleaning valve opening / closing frequency) x (chemical cleaning coefficient)
= Pi × W1 + Ci × W2 Formula (1)

Similarly, Pj is the number of cleanings when each membrane module j is physically cleaned, and Cj is the number of cleanings when chemical cleaning is performed. Here, j is 8a1 to 8an and 8b1 to 8bn. The coefficient when the physical cleaning is performed is W1, and the coefficient when the chemical cleaning is performed is W2. The coefficient value in this case is also W1 <W2. The total number Mj of cleaning times of the membrane module j is subjected to the calculation process + of the following equation (2) as the sum of each cleaning number multiplied by a coefficient, and is recorded in the cleaning history database 107.
Mj (total number of cleanings) = (physical cleaning frequency) × (physical cleaning coefficient) + (chemical cleaning frequency) × (chemical cleaning coefficient)
= Pj × W1 + Cj × W2 Formula (2)
When the membrane module is replaced, the total cleaning number Mj of the replaced membrane module j is initialized and recorded in the cleaning history database 107.

<Valve operation method>
Here, an example of a valve operating method in detecting the breakage of the membrane module will be described with reference to the flowchart of FIG. First, from the turbidity measured by the turbidimeter 9 or 10, the start of the membrane module breakage detection process is determined (step ST201). When the break detection process is not performed, both the membrane module series 21a and 21b return to normal operation (step ST202). Here, the total valve opening / closing times of the filtration outlet valves 16a and 16b are M16a and M16b, respectively. The total valve opening / closing times M16a and M16b are stored in the cleaning history database 107.

  When performing break detection, the valve opening / closing totals M16a and M16b are compared (step ST203). When M16a ≧ M16b, the break of the membrane modules 8a1 to 8an of the membrane module series 21a is detected, and the membrane module series 21b is detected. Membrane modules 8b1-8bn perform normal operation. On the other hand, when M16a <M16b, the membrane modules 8b1 to 8bn in the membrane module series 21b are detected for breakage, and the membrane modules 8a1 to 8an in the membrane module series 21a perform normal operation (step ST204).

  Now, the valves to be “open” are valves of the normal operation system, and are the break detection valve 15a, the filtration outlet valve 16b, and the membrane module valves 14b1 to 14bn. On the other hand, the valves to be “closed” are valves of the breakage detection system, and are the breakage detection valve 15b, the filtration outlet valve 16a, and the membrane module valves 14a1 to 14an (step ST205).

  From the cleaning history database 107, the membrane module with the largest total number of cleanings is selected from the membrane modules 8a1 to 8an in the membrane module series 21a. However, the already selected membrane module is excluded from the selection target (step ST206). Next, the valve opening / closing control unit 105 opens the membrane module valve of the selected membrane module (step ST207). For example, when the total number M8a1 of cleaning of the membrane module 8a1 is the largest, only the membrane module valve 14a1 corresponding to the membrane module 8a1 is set to “open”.

  Here, the turbidity of the membrane modules 8a1 to 8an of the membrane module series 21a measured by the turbidimeter 10 is set to ak, and k is set to 1 to n (step ST208). For example, the turbidity of the membrane module 8a1 measured by the turbidimeter 10 becomes the turbidity a1.

  When the turbidity ak> the reference value turbidity S (step ST209), the selected membrane module may be broken. Therefore, the valve opening / closing control unit 105 sets the membrane module valve to “closed”, and the use is stopped. Stop. At the same time, by setting the other membrane module valve to “open” (step ST210), the turbidity of the filtered waste water 3 by the other membrane module is measured by the turbidimeter 10. The turbidity measured at this time is defined as turbidity A (step ST211). The turbidity A is a value obtained by measuring the turbidity of the filtered waste water 3 excluding the membrane module 8ak that may break. In the case of turbidity ak ≦ reference value turbidity S, it is determined that the selected membrane module is not broken, and the process returns to step ST206 to detect breakage of other membrane modules.

  After that, until the turbidity A ≦ the reference value turbidity S, the remaining membrane modules are searched in order from the largest cleaning number Mj in the membrane module series 21a (step ST212). If turbidity A> reference value turbidity S, the process returns to step ST206 to select a membrane module for detecting breakage. For example, when the turbidity a1 <the reference value turbidity S, it is determined that the membrane module 8a1 is not broken. Therefore, the membrane module valve 14a1 is set to “open”, and the total number of times of washing next in the membrane module series 21a. The membrane module valve is “opened” in the order of the membrane module having the largest Mj, and the turbidity is measured. When the rupture detection of the membrane modules 8a1 to 8an is finished, the rupture detection of the membrane modules 8b1 to 8bn of the membrane module series 21b performing the normal operation is started. Normal operation is started for the membrane module series 21a for which the detection of breakage has been completed (step ST213).

  By performing the rupture detection process in this way, it is possible to reliably detect a membrane module that may break, and even during the rupture detection process, the operation of the membrane filtration process is as close to normal as possible. It is possible to drive and send water.

  Next, an example of the break detection process in the control unit 101 will be described with reference to the flowchart of FIG. First, in normal operation (step ST301), the turbidity of the filtrate 2 measured by the turbidimeter 9 is defined as turbidity X (step ST302). Then, the determination unit 102 compares the turbidity X of the filtrate 2 with the reference value turbidity S recorded in the turbidity reference value database 106 (step ST303). When turbidity X ≦ reference value turbidity S, it is determined that the membrane module is not broken and normal operation is continued.

  When turbidity X> reference value turbidity S, it is determined that one of the membrane modules is broken, and the determination unit 102 outputs a “break” signal to the break detection unit 103 (step ST304). Then, referring to the cleaning history database 107, the membrane module series 21a, 21b having the largest valve opening / closing count Mi is searched for the membrane module having the largest cleaning count Mj, and the detection order is determined (step ST305). Based on the result, the break detecting unit 103 outputs an “open / closed” signal to the valve opening / closing control unit 105 to “open” the valve of the membrane module to be detected and “close” the other valves (step). ST306). Then, the valve opening / closing control unit 105 performs opening / closing control of each valve (step ST307).

  Next, the determination unit 102 measures the turbidity of the filtered waste water 3 of the membrane module having the largest total cleaning frequency Mj with the turbidimeter 10. The turbidity measured at this time is defined as turbidity Y (step ST308). Then, the determination unit 102 compares the turbidity Y with the reference value turbidity S recorded in the turbidity reference value database 106 (step ST309).

  In the case of turbidity Y ≦ reference value turbidity S, the process returns to step ST305 in order to search the membrane module again in the breakage detection unit 103. When turbidity Y> reference value turbidity S, it is determined that a broken membrane module has been detected, the valve of the membrane module to be detected is set to “closed”, and the other valves are set to “open”. A “closed” signal is output to valve opening / closing control section 105 (step ST310). Then, the valve opening / closing control unit 105 performs opening / closing control of each valve (step ST311).

  Next, the turbidity of the same series of membrane modules excluding the membrane module whose break is detected by the break detecting unit 103 is measured by the turbidimeter 10. The turbidity measured at this time is defined as turbidity Z (step ST312). Then, the determination unit 102 compares the turbidity Z with the reference value turbidity S recorded in the turbidity reference value database 106 (step ST313).

  When the turbidity Z> the reference value turbidity S, it is determined that there are a plurality of broken membrane modules other than the already detected membrane modules, and the fracture detection unit 103 searches the membrane module again in the same series in the fracture detection unit 103 Therefore, the process returns to step ST305. On the other hand, in the case of turbidity Z ≦ reference value turbidity S, since it can be determined that there is no broken membrane module other than the already detected membrane module, the break detection ends.

  In this way, it is possible to preferentially carry out break detection processing from a large number of membrane modules as membrane modules having a high possibility of membrane breakage, with membrane modules having a high number of physical washing and chemical washing treatments performed frequently. It is possible to easily detect a membrane module that is broken.

  In addition, the rupture detection device shown in this example can be realized with ancillary equipment for a minimum membrane filtration device, so it can be implemented at a relatively low introduction cost and is easy to maintain, thus reducing the operation cost. There is an effect that can be.

  In addition, when detecting breakage, a detection method based on a simple operation of filtration operation and stop is used, so the load on the membrane module is small and the lifetime of the membrane module can be minimized. Can be maintained for a relatively long time.

  Note that the rupture detection unit 103 may detect the rupture by searching for a membrane module j that clearly has a larger number of cleanings Mj than other membrane modules. For example, when performing a break detection in the membrane filtration apparatus 100 of FIG. 1, when a search is performed for a membrane module j whose cleaning frequency total Mj recognized by the break detection unit 103 is clearly larger than all the membrane modules, priority is given. In particular, the breakage of the membrane module series 21a or 21b including the membrane module j is detected. Here, j represents one of the membrane modules 8a1 to 8an and 8b1 to 8bn. One membrane module series performs normal operation. When the break detection processing of the membrane module series 21a and 21b including the membrane module j having the largest washing number Mj is completed, the above-described break detection processing is performed.

  As a result, even when the total valve opening / closing count Mi is small, it is possible to preferentially search for a membrane module that has a high possibility of being reliably broken, and to detect a membrane module that has been broken early.

It is the block diagram which showed the structural example of the membrane filtration apparatus in one embodiment of this invention. It is the flowchart which showed the example of the fracture | rupture detection in one embodiment of this invention. It is the flowchart which showed the example of the fracture | rupture detection in one embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Supply water, 2 ... Filtration water, 3 ... Filtration drainage, 4 ... Washing water, 5 ... Washing drainage, 6 ... Supply water pump, 7 ... Backwash pump, 8a1-8an, 8b1-8bn ... Membrane module, 9 ... Turbidimeter, 10 ... Turbidimeter, 11 ... Water storage tank, 12 ... Supply water inlet valve, 13a, 13b ... Filtration inlet valve, 14a1-14an, 14b1-14bn ... Membrane module valve, 15a, 15b ... Break detection valve, 16a, 16b ... filtration outlet valve, 17 ... physical washing valve, 18 ... chemical washing valve, 19 ... washing drain valve, 20 ... chemical, 21a, 21b ... membrane module series, 100 ... membrane filtration device, 101 ... control unit, 102 DESCRIPTION OF SYMBOLS ... Determination part 103 ... Breaking detection part 104 ... Normal operation control part 105 ... Valve opening / closing control part 106 ... Turbidity reference value database 107 ... Cleaning history database

Claims (6)

A membrane filtration system comprising one or more membrane module series , wherein one or more membrane modules constitute one series of membrane module series, the raw water flowing from the primary side is filtered, and the filtrate water flows out from the secondary side. In the device
A cleaning history recording means for recording the history of cleaning times before Kimaku module,
Turbidity reference value recording means for recording a predetermined turbidity reference value;
A turbidity measuring means for measuring the filtered water turbidity before Kimaku module,
And control means for controlling the water flow before Kimaku module,
A determination unit that compares the filtered water turbidity with the predetermined turbidity reference value for each of the membrane module series, and performs determination of breakage detection of the membrane module included in the membrane module series ;
A membrane filtration apparatus comprising: a break detection means for determining a break detection order of the membrane module from the history of the number of washing times, and detecting the broken membrane module according to the order . The membrane filtration device according to claim 1,
Before Symbol break detecting means comprises a membrane module sequence for normal filtration operation, divided into membrane module series for performing fracture detection, the membrane module all water flow membrane module sequence to perform breaking detection stopped, then the membrane module A membrane filtration device characterized by searching for a broken membrane module while passing water one by one. The membrane filtration device according to claim 2,
The turbidity measuring means includes at least two for membrane filtration water measurement during normal operation and for membrane filtration water measurement during break detection. In the membrane filtration apparatus of any one of Claims 1-3 ,
The cleaning history recording means is disposed on the secondary side of the membrane module series, opens the first valve into which the filtered water or air flows, and passes the filtered water from the secondary side to the primary side. or in the case of performing physical cleaning for reverse flow the air, to record the opening and closing times of the first valve as the physical number of washes, the disposed on the secondary side of the membrane module series, the second of chemicals flowing by opening the valve, when performing chemical washing to reflux the medicine to the primary side from the secondary side, characterized by recording the number of times of opening and closing of said second valve as a drug product number of washings film Filtration device. The membrane filtration device according to claim 4,
The membrane filtration device according to claim 1, wherein the break detection means determines the priority of break detection of the membrane module for each membrane module series based on the number of physical washings and the number of chemical washings. The membrane filtration device according to claim 2 ,
A membrane filtration device comprising a water storage section for storing the filtrate water having a capacity capable of storing filtrate water to be stopped during at least one series of membrane module series breakage detection.

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