WO2014021541A1 - Appareil de filtration d'eau sur membrane à pression contrôlée et procédé de lavage des membranes - Google Patents

Appareil de filtration d'eau sur membrane à pression contrôlée et procédé de lavage des membranes Download PDF

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Publication number
WO2014021541A1
WO2014021541A1 PCT/KR2013/004017 KR2013004017W WO2014021541A1 WO 2014021541 A1 WO2014021541 A1 WO 2014021541A1 KR 2013004017 W KR2013004017 W KR 2013004017W WO 2014021541 A1 WO2014021541 A1 WO 2014021541A1
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Prior art keywords
filtration
pressure
membrane
water
flow rate
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PCT/KR2013/004017
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English (en)
Korean (ko)
Inventor
김관엽
김현배
윤희철
남해욱
한현
Original Assignee
주식회사 포스코건설
경일워터이엔지 주식회사
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Priority claimed from KR1020120085159A external-priority patent/KR101264321B1/ko
Application filed by 주식회사 포스코건설, 경일워터이엔지 주식회사 filed Critical 주식회사 포스코건설
Priority to BR112015002065-8A priority Critical patent/BR112015002065B1/pt
Publication of WO2014021541A1 publication Critical patent/WO2014021541A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/12—Controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/14—Pressure control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2317/00—Membrane module arrangements within a plant or an apparatus
    • B01D2317/04—Elements in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/04—Backflushing

Definitions

  • the present invention relates to a filtered water pressure controlled membrane filter device and a membrane cleaning method thereof, and more particularly, to a membrane filter device, which does not have a separate treated water storage tank for backwashing the membrane and storing the filtered water.
  • the present invention relates to a filtrate pressure controlled membrane filter device using a part of the membrane as a backwash water and a membrane washing method thereof.
  • the separation membrane In the membrane filtration process applied to the water treatment, the separation membrane has voids formed on the surface to remove contaminants, thereby purifying water.
  • the membrane filtration process depends on the characteristics of the raw water to be treated and the water quality requirements of the final treatment water. This may be applied alone or in combination with various treatment processes such as ozone treatment, activated carbon adsorption, reverse osmosis membrane filtration at the end of the membrane filtration process.
  • the filtrate produced from the membrane filtration process is collected in a storage tank, and a pump is installed to apply driving force and pressure for supply flow to the post-stage process. Supply.
  • a membrane filter device in which a permeate tank for backwashing a membrane module is removed is used.
  • the membrane permeate obtained from other membrane modules is used for backwashing, so the membrane filtered water is stopped during backwashing.
  • a method of operating a membrane filter device in which a plurality of modules are installed in parallel to perform filtration and washing steps alternately provides a separate filtrate tank for storing filtrate water.
  • the backwashing operation used to backwash the membrane module is installed, and the filtration process of all modules is stopped at the time of backwashing because the filter water line and the backwash water supply line are composed of one.
  • the filtrate side pressure is usually dependent on the supply side pressure and the intermembrane pressure difference.
  • the materials that do not pass through the membrane accumulate on the membrane surface and the pores, which acts as a resistance to the filtration process, thereby increasing the transmembrane pressure continuously.
  • the feed side pressure is increased to maintain a constant flow rate of the filtrate produced in the membrane filter.
  • the present invention has been made to solve the conventional problems as described above, the treatment water storage tank is unnecessary in the membrane filtration device, which can increase the space efficiency and improve the backwashing efficiency by controlling the pressure of the backwashing filtrate In case of backwashing some membranes, it is possible to provide the same flow rate of the filtered water to the back-end process, to control the input of the backwashing water without a separate operation, to control the pressure of the backwashing water without a separate operation, It is an object of the present invention to provide a filtered water pressure controlled membrane filter device and a membrane cleaning method thereof, which can increase energy efficiency of an entire water treatment process.
  • the present invention for achieving the above object is a membrane filtration device for branching the supply water and filtering by the separation membrane, a plurality of filtration supply unit for supplying the branched supply water to each separation membrane; A plurality of membrane filtration sections for filtering the feed water supplied by the respective filtration supplies by a separation membrane; A plurality of filter discharge parts for discharging the filtered water treated in each of the membrane filter parts; A backwashing unit connected to a downstream of the filtration discharge unit to backwash a part of the filtrate to the membrane filtration unit to backwash the separation membrane; A backwash discharge part connected to each of the membrane filter parts to discharge backwash water to the outside during backwashing of the membrane filter part; And a pressure control unit installed downstream of the filtration discharge unit to control the pressure of the filtrate water.
  • the present invention is characterized in that it further comprises a flow rate control unit connected to the downstream of the membrane filtration unit to measure the flow rate of the filtered water discharged to control the flow rate of the feed water supplied to the membrane filtration unit by the filtration supply unit. .
  • the flow rate control part of the present invention includes: first flow rate measuring means connected to a downstream of the membrane filter part and measuring a flow rate of the filtered water discharged from each membrane filter part; Second flow rate measuring means connected to a downstream of the filtration discharge unit and measuring a flow rate of the total filtered water discharged from the entire membrane filtration unit; It is connected to the first flow rate measuring means and the second flow rate measuring means for providing a flow rate control signal of the feed water supplied to the membrane filter unit according to the measurement results of the first flow rate measuring means and the second flow rate measuring means, respectively.
  • Flow control means And a flow rate adjusting means connected to each of the filtration supply parts to adjust a flow rate of the feed water supplied to the membrane filtration part based on the flow rate control signal of the flow rate control means.
  • the flow rate adjusting means of the present invention adjusts the flow rate of the feed water supplied to the remaining membrane filter part so that the flow rate of the filtered water of the remaining membrane filter part during the backwash of the partial membrane filter part is kept the same as the flow rate of the filtered water of the whole membrane filter part.
  • the filtration supply unit of the present invention a plurality of filtration supply valve for opening and closing the supply of the branched supply water, respectively; And a plurality of filtration supply pumps for pumping the supply water supplied through the respective filtration supply valves.
  • the backwashing unit of the present invention includes: a pressure-expandable backwash tank including a gas tank in which gas is maintained at a constant pressure, a filtration water tank into which filtered water flows in and out, and a partition installed between the gas tank and the filtration water tank so as to stretch their partition space; A backwash water valve installed in the filtered water inlet pipe connected downstream of the filtered discharge part so that a portion of the filtered water flows back to the filtered water tank; And a plurality of backwash injection valves respectively installed in the backwashing introduction pipe branched to discharge the filtered water from the filtrate tank and to be introduced into the respective membrane filtration units.
  • the pressure measuring means is installed downstream of the filtration discharge unit for measuring the pressure of the filtered water; Pressure control means connected to said pressure measuring means for providing a pressure control signal in accordance with the measurement result of said pressure measuring means; And a pressure regulating means installed downstream of the pressure measuring means to adjust the pressure of the filtrate based on the pressure control signal of the pressure controlling means.
  • the present invention is a membrane cleaning method of the filtered water pressure controlled membrane filter device, comprising the steps of: closing the filtration supply unit and the filtration discharge unit connected to any one of the plurality of membrane filtration unit; Opening a filtration supply part and a filtration discharge part connected to the rest of the plurality of membrane filtration parts; Controlling the pressure of the filtered water by a pressure control unit connected to the filtration discharge unit; And opening the backwashing unit and the backwashing unit connected to the membrane filtration unit in which the filtration supply unit and the filtration discharge unit are closed, and closing the remaining backwashing unit and the backwashing unit.
  • the present invention is to measure the flow rate of the filtered water discharged from the remaining membrane filtration unit to maintain the flow rate of the filtration water of the remaining membrane filtration unit at the time of backwashing the partial membrane filtration unit of the entire membrane filtration unit, the respective membranes It characterized in that it further comprises the step of controlling the flow rate of the feed water supplied to the filtration unit.
  • a part of the filtrate filtered in the membrane filtration process is used as a backwash water to control the pressure of the backwashing filtrate, thereby eliminating the need for a treated water storage tank in the membrane filtration device, thereby improving space efficiency. It can increase and control the pressure of the backwashing filtrate to provide the effect of improving the backwashing efficiency.
  • FIG. 1 is a block diagram showing a filtered water pressure controlled membrane filter device according to an embodiment of the present invention.
  • Figure 2 is a state diagram showing the filtration process of the filtered water pressure control membrane filter device according to an embodiment of the present invention.
  • Figure 3 is a state diagram showing the backwashing process of the filtered water pressure control membrane filter device according to an embodiment of the present invention.
  • 4 to 6 is a configuration of the pressure control unit of the filtered water pressure control membrane filter device according to an embodiment of the present invention.
  • FIG. 7 is a graph showing the driving pressure of a conventional membrane filter.
  • FIG. 8 is a graph showing the driving pressure of the filtered water pressure control membrane filter device according to an embodiment of the present invention.
  • Figure 9 is a block diagram showing the filtration process of the filtered water pressure controlled membrane filter device according to an embodiment of the present invention.
  • FIG. 10 is a block diagram showing a backwashing process of the filtrate pressure controlled membrane filter device according to one embodiment of the present invention.
  • FIG 11 is a graph showing a comparison between the filtration flow rate and the backwash flow rate in the filtrate pressure control membrane filter device according to an embodiment of the present invention.
  • FIG. 12 is a flow chart showing a membrane washing method of the filtrate pressure controlled membrane filter device according to an embodiment of the present invention.
  • FIG. 1 is a block diagram showing a filtered water pressure controlled membrane filter device according to an embodiment of the present invention
  • Figure 2 is a state diagram showing a filtration process of a filtered water pressure controlled membrane filter device according to an embodiment of the present invention
  • Figure 3 4 is a state diagram illustrating a backwashing process of the filtrate pressure controlled membrane filter device according to an embodiment of the present invention
  • FIGS. 4 to 6 are configuration diagrams of a pressure control unit of the filtrate pressure controlled membrane filter device according to an embodiment of the present invention.
  • FIG. 7 is a graph showing the driving pressure of the conventional membrane filter
  • Figure 8 is a graph showing the driving pressure of the filtered water pressure control membrane filter device according to an embodiment of the present invention
  • Figure 9 is an embodiment of the present invention 10 is a block diagram illustrating a filtration process of a filtrate pressure controlled membrane filter device according to an example
  • FIG. 10 is a filtrate pressure controlled membrane filter device according to an embodiment of the present invention
  • 11 is a block diagram illustrating a three step process
  • FIG. 11 is a graph illustrating a comparison between a filtration flow rate and a backwash flow rate of a filtrate pressure controlled membrane filter device according to an embodiment of the present invention
  • FIG. 12 is a filtrate water according to an embodiment of the present invention.
  • a flow chart showing a membrane cleaning method for a pressure controlled membrane filter.
  • the filtered water pressure controlled membrane filter device includes a filtration supply part, a membrane filter part, a filtration discharge part, a backwash input part, a backwash discharge part, a pressure control part, a flow rate control part, It is a membrane filtration device which branches supply water and filters it by a separation membrane.
  • the filtration supply part is a supply means provided in each of the branch pipes 1A, 1B, 1C, 1D, and 1E which are divided into a plurality of branches so as to supply the feed water to the separation membrane of each membrane filtration part. 13, 14, 15) and a plurality of filtration feed pumps (31, 32, 33, 34, 35).
  • Filtration supply valves 11, 12, 13, 14, and 15 are respectively installed in branched pipes 1A, 1B, 1C, 1D, and 1E to supply the feed water from the reservoir to the respective membrane filters. In this way, the branched supply water is opened and closed to supply to each membrane filtration unit.
  • the filtration supply valves 11, 12, 13, 14, and 15 of the present embodiment include a first filtration supply valve 11, a second filtration supply valve 12, a third filtration supply valve 13, and a fourth filtration supply. Although it consists of five filtration supply valves of the valve 14 and the 5th filtration supply valve 15, of course, it is also possible to consist of two to four and six or more filtration supply valves.
  • Filtration feed pumps (31, 32, 33, 34, 35) are respectively installed in the branch pipe (1A, 1B, 1C, 1D, 1E) branched to supply the feed water to each membrane filter in the reservoir of the feed water. It is installed downstream of the filtration supply valves 11, 12, 13, 14, and 15, and thus each of the membrane filtration by pumping the feed water supplied through the filtration supply valves (11, 12, 13, 14, 15), respectively. To supply wealth.
  • Filtration supply pumps 31, 32, 33, 34, 35 of the present embodiment Five filtration supply pumps of the first filtration supply pump 31, the second filtration supply pump 32, the third filtration supply pump 33, the fourth filtration supply pump 34, and the fifth filtration supply pump 35.
  • Five filtration supply pumps of the first filtration supply pump 31, the second filtration supply pump 32, the third filtration supply pump 33, the fourth filtration supply pump 34, and the fifth filtration supply pump 35 Of course, but it is also possible to consist of two to four and six or more filtration feed pump.
  • the membrane filtration unit is composed of a plurality of separation membrane filters (61, 62, 63, 64, 65) for filtering the feed water supplied by each filtration supply unit with a separation membrane.
  • Membrane filters 61, 62, 63, 64, 65 are installed in inlet pipes downstream of the respective filtration supply pumps 31, 32, 33, 34, 35, and respective filtration supply pumps 31, 32, 33. , 34, 35) to filter the feed water pumped by the separation membrane to filter the contaminants contained in the feed water, and discharge the filtered filtrate water downstream.
  • the membrane filters 61, 62, 63, 64, and 65 of the present embodiment may include a first membrane filter 61, a second membrane filter 62, a third membrane filter 63, a fourth membrane filter 64, and a second membrane filter 64.
  • the five separator filters of the five separator filters 65 but of course it is also possible to consist of two to four and six or more membrane filters.
  • the filtration discharge part is composed of a plurality of filtration discharge valves 81, 82, 83, 84, 85 for discharging the filtered water treated in each membrane filtration part.
  • Filtration discharge valves 81, 82, 83, 84, and 85 are respectively installed in discharge pipes 30A, 30B, 30C, 30D, and 30E downstream of the membrane filter part for discharging the filtered water from each membrane filter part.
  • the filtered water discharged in this way is opened and closed to discharge from the membrane filtration unit.
  • the filtration discharge valves 81, 82, 83, 84, and 85 of the present embodiment include a first filtration discharge valve 81, a second filtration discharge valve 82, a third filtration discharge valve 83, and a fourth filtration discharge valve. It consists of five filtration discharge valves of the valve 84 and the 5th filtration discharge valve 85, Of course, it is also possible to consist of two to four and six or more filtration discharge valves.
  • the backwashing section is connected to a downstream side of the filtration discharge section to input a portion of the filtrate to the membrane filtration section of any one of the plurality of membrane filtration sections without having a separate treatment water storage tank for storing the filtered water discharged from the plurality of membrane filtration sections.
  • it consists of a non-powered pressure expansion backwash tank 500, the backwash valve 600, and the plurality of backwash injection valves 91, 92, 93, 94, 95.
  • the pressure-expanded backwash tank 500 is a gas tank 510 as a supply means for backwashing filtrate which flows in and out of filtrate by non-power by the expansion and contraction using the pressure of gas, as shown in FIGS. It consists of a filtration water tank 520 and a membrane 530.
  • the gas tank 510 is a storage tank sealed to maintain the gas at a constant pressure, and the filtrate tank 520 is installed in the backwash filtrate inlet pipe branched from the filtrate discharge pipe, and the inlet port 521 so that the backwash filtrate flows in and out. ) And an outlet 522 are provided.
  • the diaphragm 530 is provided between the gas tank 510 and the filtration tank 520, and partitions these spaces, and the direction of the gas tank 510 or the direction of the filtration tank 520 is divided by the pressure difference therebetween. It is installed to stretch.
  • the backwash water valve 600 is a valve installed in the backwashing water inlet pipe branched from the filtrate discharge pipe so as to open and close the inflow of backwashing filtrate into the filtrate tank 520, and is opened for backwashing of some membrane filters.
  • the backwash injection valves 91, 92, 93, 94, and 95 are backwashing pipes connected downstream of the membrane filtration unit in order to flow the filtered water treated in each membrane filtration unit to one of the plurality of membrane filtration units. 40A, 40B, 40C, 40D, and 40E), respectively, to open and close the backflow of the filtered water to be introduced into the membrane filtration unit.
  • the backwash check valves 91, 92, 93, 94, 95 of the present embodiment include a first backwash check valve 91, a second backwash check valve 92, a third backwash check valve 93, and a fourth backwash check valve.
  • the valve 94 and the five back check valves of the fifth back check valve 95 are composed of, two to four and six or more back check valves may be made.
  • the backwash discharge part comprises a plurality of backwash discharge valves 21, 22, 23, 24, and 25 connected to each membrane filter part and discharging the backwashing water discharged from the membrane filter part to the outside during back washing of the membrane filter part.
  • the backwash discharge valves 21, 22, 23, 24, and 25 are respectively connected to the backwash discharge pipes 2A, 2B, 2C, 2D, and 2E connected to the membrane filter to discharge the backwashed backwashed water from the respective membrane filters. It is installed, and the backwashing discharged in this way is opened and closed to discharge from the membrane filter unit to the outside.
  • the backwash discharge valves 21, 22, 23, 24, and 25 of the present embodiment include a first backwash discharge valve 21, a second backwash discharge valve 22, a third backwash discharge valve 23, and a fourth backwash discharge valve. Although it consists of five backwash discharge valves of the valve 24 and the 5th backwash discharge valve 25, of course, it is also possible to consist of two to four and six or more backwash discharge valves.
  • the pressure control unit is configured to control the pressure of the filtrate discharged and installed downstream of the filtration discharge unit to provide an appropriate pressure to the backwash filtrate during backwashing of some membrane filters, and includes a pressure measuring means, a pressure control means and a pressure adjusting means. Doing.
  • the pressure measuring means comprises a filtration process pressure sensor 800 which is installed downstream of the filtration discharge part and measures the pressure of the filtrate, and the pressure control means is connected to the pressure measuring means to generate a pressure control signal according to the measurement result of the pressure measuring means. It provides a filtration process pressure controller 810, the pressure regulating means is installed downstream of the pressure measuring means to the filtration process pressure control valve 100 for adjusting the pressure of the filtrate based on the pressure control signal of the pressure control means. It is preferable that it is made.
  • the flow rate control unit is connected to the downstream of the membrane filtration unit, and measures the flow rate of the discharged filtered water to control the flow rate of the supply water supplied to the membrane filtration unit by the filtration supply unit, the first flow rate control means, the second flow rate control means And flow rate control means and flow rate control means.
  • the first flow control means comprises a plurality of filtered discharge water flow rate sensors 71, 72, 73, 74, 75 which are connected downstream of the membrane filter part and respectively measure the flow rate of the filtered water discharged from each membrane filter part.
  • the filtration discharge water flow rate sensors 71, 72, 73, 74, and 75 of the present embodiment include a first filtration discharge water flow rate sensor 71, a second filtration discharge water flow rate sensor 72, a third filtration discharge water flow rate sensor 73, although it consists of five filtration discharge water flow rate sensors of the 4th filtration discharge water flow rate sensor 74 and the 5th filtration discharge water flow rate sensor 75, it is a matter of course that it is also comprised from 2-4 pieces and 6 or more filtration discharge water flow rate sensors. .
  • the second flow control means comprises a filtrate flow rate sensor 700 which is connected downstream of the filtrate discharge portion and measures the flow rate of the total filtrate water discharged from the entire membrane filter portion.
  • the flow rate control means is composed of a flow rate controller 710 connected to the first flow rate measuring means and the second flow rate measuring means and providing a control signal to control the flow rate of the supply water respectively supplied to the membrane filtration unit.
  • the flow rate adjusting means is a plurality of pump speed controllers 41, 42, 43, 44, 45 which are respectively connected to the filtration supply part and regulate the flow rate of the feed water supplied to each membrane filter part by the command of the flow rate control means. consist of.
  • the pump speed controller 41, 42, 43, 44, 45 of the present embodiment includes a first pump speed controller 41, a second pump speed controller 42, a third pump speed controller 43, It consists of five pump speed controllers of the fourth pump speed controller 44 and the fifth pump speed controller 45, but of course, it is also possible to include two to four and six or more pump speed controllers. .
  • the flow rate adjusting means adjusts the flow rate of the feed water supplied to the remaining membrane filter part so that the flow rate of the filtered water of the remaining membrane filter part is kept equal to the flow rate of the filtered water of the entire membrane filter part during back washing of some membrane filter parts.
  • the rear end process pressure regulating valve 200, the rear end pressure sensor 900, and the rear end installed downstream of the filtrate pressure controlled membrane filter are provided.
  • the process pressure controller 910 it is also possible to adjust the pressure of the filtered water required for the post-stage process by the process pressure controller 910.
  • the rear stage pressure control valve 200 is installed downstream of the rear stage to adjust the pressure of the filtered water flowing into the rear stage.
  • the post-stage process pressure sensor 900 is preferably composed of a pressure sensor installed upstream of the post-stage process to measure the pressure of the filtered water flowing into the rear stage process.
  • the after-stage process pressure controller 910 is connected to the after-stage process pressure control valve 200 and the after-stage process pressure sensor 900 to open the post-stage process pressure control valve 200 according to the measurement result of the after-stage process pressure sensor 900. By adjusting the control signal is provided to control the pressure of the filtered water required for the post-stage process.
  • the filtrate pressure control membrane filter device of the present embodiment has a problem in that a post-stage process supply pump is separately installed to reinforce the loss of the driving pressure caused by the filtrate storage tank as shown in the driving pressure graph of the conventional membrane filter device of FIG. 7.
  • the pressure loss is reduced by the pressure control part made up of the non-powered pressure squeezed backwash tank, thereby driving the filtered water without installing a separate post process feed pump.
  • the pressure can be used as the driving pressure of the post-stage process as it is.
  • the filtration flow rate of the whole membrane filter in the filtration process of the whole membrane filter is composed of the total filtration flow rate (Q t ) and the backwash flow rate (Q b ), and the filtration flow rate of each membrane filter ( q) can be constituted by any it knows the value obtained by dividing the sum (Q t + Q b) of the total permeate flow rate (Q t) and the back washing flow rate (Q b) to the number (n) of the membrane filter.
  • the filtration flow rate q of each remaining membrane filter is divided by the total filtration flow rate Q t by the number of remaining membrane filters n-1. It can be seen that it consists of a value.
  • the backwash flow rate is the filter flow rate for each series for effective desorption of contaminants attached to the separation membrane during backwashing Supplying a flow rate of 1 to 3 times (q) (a value in Fig. 11), and the membrane filter unit is provided with two or more series of separation membrane filter to further filter the flow rate of the filtrate consumed during backwashing It is measured.
  • the ratio of the backwash flow rate to the total filtration flow rate of the membrane filtration device is lower as the backwash flow rate ratio, ie, the backwash flow rate multiplier is smaller, and the higher the number of series of the membrane filtration device.
  • the low filtration flow rate per unit area, ie the permeate flux means that the membrane filtration device can be stably operated for a long time.
  • the membrane fouling material may not be easily removed during the backwash of the membrane, and the recovery performance of the membrane may be lowered. If the permeate flux is too low, it means that it is uneconomical because a plurality of membranes should be installed.
  • the ratio of the backwash flow rate to the cleavage water of the cleavage water of 4 to 10 membrane filters is 10 to 40%. It can be seen that it is preferable to maintain as.
  • the membrane washing method of the filtered water pressure-controlled membrane filter device of the present embodiment the closing step (S10) of some of the filtration supply and filtration discharge portion, the opening step of the remaining filtration supply and filtration discharge portion ( S20), the pressure control step of the filtered water (S30), the opening step of some backwashing and backwash discharge (S40), the closing step of the remaining backwashing and backwash discharge (S50), the flow rate control step of the feed water (S60) )
  • Closing step (S10) of the part of the filtration supply unit and the filtration discharge unit is a step of closing the filtration supply unit and the filtration discharge unit connected to any one of the plurality of membrane filtration units, and the first filtration supply valve 11 and the first filtration discharge valve. Closing (81) closes the filtration process of the first membrane filter (61).
  • Opening of the remaining filtration supply unit and the filtration discharge unit is a step of opening the filtration supply unit and the filtration discharge unit connected to the rest of the plurality of membrane filters, the second to fifth filtration supply valves (12, 13, 14, 15) and the second to fifth filtration discharge valves 82, 83, 84, 85 are opened to perform the filtration process of the second to fifth separation membrane filters 62, 63, 64, 65.
  • Pressure control step (S30) of the filtered water is a step of controlling the pressure of the filtered water by the pressure control unit connected to the filtration discharge unit, the opening degree of the filtration process pressure control valve 100 in accordance with the measurement result of the filtration process pressure sensor 800 The pressure of the filtrate is controlled to provide an appropriate pressure to the backwash filtrate during backwashing of some membrane filters.
  • the opening of the backwashing portion and the backwashing portion of the portion (S40) is a step of opening the backwashing portion and the backwashing portion connected to the membrane filtration portion in which the filtration supply portion and the filtration discharge portion are closed, and the backwashing valve 91 and the backwashing discharge
  • the valve 21 is opened to perform the backwashing process of the first separator filter 61.
  • the closing step S50 of the remaining backwashing unit and the backwashing unit is a step of closing the remaining backwashing unit and the backwashing unit, and the second to fifth backwashing valves 92, 93, 94, 95 and the second to fifth backwashing unit are closed.
  • the fifth backwash discharge valves 22, 23, 24, and 25 are closed to stop the backwashing process of the second to fifth separator filters 62, 63, 64, and 65.
  • Supply flow rate control step (S60) by measuring the flow rate of the filtered water discharged from the remaining membrane filtration unit to maintain the flow rate of the filtration water of the remaining membrane filtration unit during the backwash of some membrane filtration unit, the same as the flow rate of the filtration water of the whole membrane filtration unit Controlling the flow rate of the feed water supplied to each membrane filtration unit, by measuring the flow rate of the filtered water discharged from the remaining membrane filtration unit with the filtered water flow sensor 700 to the remaining membrane filtration unit by the flow controller 710 A control signal is provided to control the flow rate of the feed water, and the second to fifth pump speed controllers 42, 43, 44, and 45 are used to control the second to fifth filtration supply pumps 32, 33, 34 and 35 are controlled to adjust the flow rate of the feed water supplied to the second to fifth separator filters 62, 63, 64, and 65.
  • a portion of the filtered water filtered in the membrane filtration process is used as a backwash water and the pressure of the backwashing filtrate is controlled, thereby eliminating the need for a treated water storage tank in the membrane filtration device. It can increase and control the pressure of the backwashing filtrate to provide the effect of improving the backwashing efficiency.
  • the present invention provides a filtered water pressure controlled membrane filter device and a membrane cleaning method using a portion of the filtered water treated in the membrane filtration process as a backwash water of the membrane without providing a separate treated water storage tank for backwashing the membrane and storing the filtered water in the membrane filtration device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Nanotechnology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Cette invention concerne un appareil de filtration d'eau sur membrane à pression contrôlée et un procédé associé de lavage des membranes. L'appareil de filtration sur membrane qui filtre l'eau approvisionnée à l'aide d'une membrane de séparation comporte : plusieurs filtres d'approvisionnement de l'eau ; plusieurs membranes de filtration de l'eau acheminée ; plusieurs unités qui éliminent l'eau filtrée ; une unité de lavage à contre-courant qui renvoie une partie de l'eau filtrée vers les membranes pour les nettoyer ; une unité d'élimination qui rejette vers l'extérieur l'eau utilisée pour laver à contre-courant les membranes ; et une unité de contrôle de la pression qui contrôle la pression de l'eau filtrée envoyée à contre-courant. Selon l'invention, une partie de l'eau filtrée par le processus de filtration sur membrane est utilisée comme eau de lavage à contre-courant, et la pression de l'eau filtrée envoyée à contre-courant est contrôlée de manière à éliminer la nécessité d'un réservoir de stockage de l'eau traitée pour l'appareil de filtration sur membrane. L'utilisation de l'espace est ainsi optimisée et la pression de l'eau filtrée envoyée à contre-courant est contrôlée de manière à améliorer l'efficacité du lavage à contre-courant.
PCT/KR2013/004017 2012-08-03 2013-05-08 Appareil de filtration d'eau sur membrane à pression contrôlée et procédé de lavage des membranes WO2014021541A1 (fr)

Priority Applications (1)

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BR112015002065-8A BR112015002065B1 (pt) 2012-08-03 2013-05-08 aparelho de filtração de membrana de pressão de água filtrada controlado e método de limpeza de membrana

Applications Claiming Priority (2)

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KR10-2012-0085159 2012-08-03
KR1020120085159A KR101264321B1 (ko) 2011-09-09 2012-08-03 여과수 압력제어형 막여과장치 및 그의 막세척방법

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WO2014021541A1 true WO2014021541A1 (fr) 2014-02-06

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CN109589798A (zh) * 2018-12-12 2019-04-09 南方科技大学 分离膜的阈通量的测量方法和测量设备
CN115475535A (zh) * 2022-09-21 2022-12-16 马鞍山三塔环保科技有限公司 一种移动式压力膜组件再生装置

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CN107176651A (zh) * 2016-03-11 2017-09-19 豪威株式会社 净水器以及净水器的控制方法
EP3427807A4 (fr) * 2016-03-11 2019-04-03 Coway Co., Ltd. Purificateur d'eau et procédé de commande de purificateur d'eau
US20220080356A1 (en) * 2016-03-11 2022-03-17 Coway Co., Ltd. Water purifier and control method for water purifier
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CN109589798A (zh) * 2018-12-12 2019-04-09 南方科技大学 分离膜的阈通量的测量方法和测量设备
CN109589798B (zh) * 2018-12-12 2021-05-25 南方科技大学 分离膜的阈通量的测量方法和测量设备
CN115475535A (zh) * 2022-09-21 2022-12-16 马鞍山三塔环保科技有限公司 一种移动式压力膜组件再生装置

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