WO2016140411A1

WO2016140411A1 - Device and method for real-time membrane fouling monitoring in reverse osmosis membrane vessel

Info

Publication number: WO2016140411A1
Application number: PCT/KR2015/008387
Authority: WO
Inventors: 김지훈; 김형수
Original assignee: 성균관대학교 산학협력단
Priority date: 2015-03-05
Filing date: 2015-08-11
Publication date: 2016-09-09
Also published as: KR101533554B1

Abstract

The present invention relates to the technical field of water treatment and, more specifically, provides monitoring device and method for detecting real-time the degree of membrane fouling of a reverse osmosis membrane vessel in a reverse osmosis membrane treatment device. To this end, the present invention comprises an RO treatment simulation unit which separates treated water and condensed water by means of simulation of a reverse osmosis membrane vessel and RO treatment, wherein the RO treatment simulation unit has three cells that simulate elements of an actual RO treatment unit and wherein influent water flows into any one of the three cells on the basis of the water level of an influent water storage unit.

Description

Real-time membrane contamination monitoring apparatus and method in reverse osmosis membrane vessel

The present invention relates to the technical field of water treatment, and more particularly, to a monitoring apparatus and method for detecting the degree of membrane contamination of the reverse osmosis membrane vessel in the reverse osmosis membrane treatment apparatus.

Desalination refers to the process of removing salt from sewage, wastewater, dam water, as well as seawater containing salts, and removing inorganic salts as well as Na ⁺ , Cl ^- ions. It is a process.

Various processes can be used for this purpose, and the membrane filtration process is a typical example.

The membrane filtration process refers to a physical filtration method in which a separation membrane is used as a filter medium to pass water to separate and remove impurities in raw water and to obtain clean filtered water.

1A shows the general flow of a reverse osmosis membrane treatment device, which is one of the membrane filtration processes. Raw water such as seawater flows into the pretreatment unit 10, pretreatment water flows into the pretreatment unit 20, pretreatment water flows into the RO treatment unit 30, and the RO treatment unit 30 receives the pretreatment water. RO treatment is divided into filtered and concentrated water.

The RO processing unit 30 is composed of a reverse osmosis membrane vessel. 1B shows an example of a reverse osmosis membrane vessel, which is illustrated as having seven elements 31 to 37 illustratively. Reverse osmosis membrane is naturally used for each of the elements 31 to 37, and membrane fouling inevitably occurs during the filtration process. Detailed description of the reverse osmosis membrane vessel of Figure 1b will be described later.

Here, "membrane fouling" is a phenomenon in which various foreign substances existing in the inflow water flowing into the membrane are deposited or adsorbed on the surface of the filter membrane to reduce the permeate amount of the membrane. Based on the causative substances, membrane fouling of particulate matter by colloid or suspended solids, membrane fouling of organic substances by adsorption of organic substances such as natural organic substances, biofilm fouling by microorganism attachment or growth, precipitation or scale of metal salts, etc. It can be classified into inorganic membrane fouling.

Membrane fouling in desalination plants using reverse osmosis membranes or nanofiltration membranes is the biggest problem when operating in the field because it reduces the performance of membranes and lowers the recovery rate.

In order to solve this problem, a method of reinforcing the pretreatment process to minimize membrane contamination in advance or optimizing the operating conditions of the main treatment process is generally used. In order to restore the permeability of the CIP, cleaning in place (CIP) is performed through physical cleaning or chemicals such as flushing.

The most effective can be called chemical cleaning (CIP). When performing frequent chemical cleaning (CIP), the production performance is greatly deteriorated due to the stoppage of treatment water production, and due to the increase of the chemical cost and cleaning waste treatment cost, etc. Maintenance performance is also deteriorated and, in addition, deterioration of the rejection of used separators, deformation and aging of the separators can ultimately lead to an increase in overall operational management costs by accelerating the membrane replacement time.

Therefore, it is very important to perform cleaning at an appropriate time, and for this purpose, the importance of a method for effectively predicting and evaluating the extent of membrane fouling materials is increasing day by day. Various methods for this purpose have been proposed and used in the related art, and will be discussed in detail.

At present, the most widely used method may be referred to as a method for measuring a Si Den Density Index (SDI) index.

The SDI index obtained by measuring the SDI of the influent is a method of predicting the membrane fouling tendency of the influent in the desalination process using the reverse osmosis membrane and the nanofiltration membrane. In general, when the SDI index value is less than 2 to 3, it is determined that the membrane contamination is not severe inflow source water, and when the SDI index value is 5 or more, it is determined that the membrane contamination is an influent source.

However, the SDI index is only a method of indirectly measuring the possibility of membrane contamination, and in particular, it is measured by passing the influent at a pressure of 30 psi using a separator having a diameter of 47 mm (or 0.45 pore size). There is a big problem that the impact of colloids or organic matter of a smaller size can not be evaluated.

In addition, since the desalination process mainly using the reverse osmosis membrane and the nanofiltration membrane uses a cross-flow filtration mode in which the inflow direction and the permeation direction of the filtration membrane are orthogonal to each other, the dead-end ) And the filtration principle is different.

In order to overcome the limitations of the SDI index, a modified fouling index (MFI) measurement method, a modified fouling index by ultrafilter (MFI-UF) measurement method, and a modified fouling index by nanofilter (MFI-NF) measurement method have been proposed. Since all of them use one separator and are similarly measured as full filtration mode, the problem of being different from the cross-flow filtration mode in the actual desalination process is not solved.

In this regard, the patent literature is first reviewed as follows.

Korean Patent Publication No. 10-2011-0089710, Korean Patent Publication No. 10-2014-0016417, Korean Patent Publication No. 10-2010-0057262, Korean Patent Publication No. 10-2013-0081436, Korean Patent Publication No. 10- 2014-0076197 is a quantitative membrane fouling index for membrane fouling caused by particulate matter, colloidal material, organic matter, etc., using a variety of microfiltration (MF), ultrafiltration (UF), and nanofiltration (NF) separation membranes. We propose a method to classify and predict by membrane source.

In order to enhance the measurement portability, increase the measurement accuracy of the membrane fouling index, and shorten the measurement time, it is possible to measure in series and in parallel with a plurality of separators.

However, these methods also do not solve the problem of using 0.45 pore membranes in the same way as the SDI index and the difference from the cross-flow filtration mode in the actual desalination process.

Korean Patent Laid-Open Publication No. 10-2014-0054670 discloses a membrane fouling index (TMP, trans-membrane pressure) in real time in a membrane filtration process operated at low pressure of microfiltration (MF) and ultrafiltration (UF). The present invention proposes an apparatus and method for controlling membrane fouling using a membrane fouling index that can be calculated using a rate of change and can selectively perform optimal chemical cleaning (CIP) according to the calculated membrane fouling index.

Similarly, the problem of using a 0.45 pore separator in the same manner as the SDI index and the problem of differing from the cross-flow filtration mode in the actual desalination process are not solved.

Korean Patent Laid-Open No. 10-2013-0085220 proposes a real-time monitoring device that receives measurement information from sensors such as a flowmeter and a pressure gauge of a seawater desalination plant, calculates a membrane fouling degree of a reverse osmosis membrane, and diagnoses and controls it through a control unit.

Its advantage is that it enables early diagnosis of membrane fouling, but the limitation is that it is indirect membrane fouling diagnosis through real-time measurement and analysis of sensors such as flow meters, pressure gauges, pH meters and thermometers.

Korean Patent Registration No. 10-0811199, Korean Patent Registration No. 10-1318578, and Korean Patent Publication No. 10-2011-0102750 are flow field flow fractions useful for the measurement of molecular weight and particle size distribution, such as chromatography. We propose an evaluation method that analyzes the degree of adsorption according to the characteristics of the membrane by calculating the area of the separated chromatogram of natural organic substances using the fractionation technique. In addition, by measuring the dynamic hysteresis of the reverse osmosis membrane and nanofiltration membrane (Physical hysteresis), we propose a prediction method that can predict the membrane fouling of the membrane and simultaneously or separately the chemical and physical non-uniformity.

However, this is a problem that it is limited to organic membrane fouling, and that there is a limitation in the direct measurement pressure range, so that continuous measurement is impossible, and thus it is impossible to apply in actual desalination facilities.

Korean Patent Publication No. 10-2014-0037357 focuses on the fact that it is very important not only to predict membrane fouling through membrane fouling index, but also to normalize the water treatment process by cleaning contaminated separators. We propose a method for securing an objective basis such as guidelines for the selection of cleaning agents and cleaning performance used in the process of cleaning the membrane. That is, the membrane cleaning index and the membrane calculated by measuring the amount of the washing water passing through the membrane in accordance with the state that is removed to the foreign matter by the detergent by supplying the cleaning agent to the surface of the membrane in the contaminated state, and flowing the washing water to the separator. A washing index measuring device is proposed.

However, it is difficult to identify membrane contamination below 0.45 pore size, and the type and amount of detergent are all based on the filtration mechanism of pre-filtered microfiltration (MF) membrane, so nanofiltration (MF) and reverse osmosis without pore in actual desalination process The problem is that application is difficult because the RO membrane is different from the cleaning conditions.

This problem is because the microfiltration membrane and the reverse osmosis membrane operated at high pressure by the solute and solvent diffusion and transfer principle do not have a pore size, and thus the microfiltration membrane and ultrafiltration membrane having the pore size and operated at low pressure by the sieving method principle. The filtration mechanism of the membrane is due to the difference.

In other words, nanofiltration membranes and reverse osmosis membranes, unlike microfiltration membranes and ultrafiltration membranes, are generally particles, organic materials, and inorganic materials (scaling) that are blocking pore size by means of water washing or air scribing with chemicals. In other words, it is virtually impossible to apply the techniques proposed here to desalination plants, such as reverse osmosis, because backwashing is not possible for biofilm fouling.

Next, the actual commercially available devices are reviewed as follows.

2 shows a facility for detecting membrane fouling of a reverse osmosis membrane vessel in a desalination plant (see www.rowaterpurifiers.com). In practice, most desalination plants process thousands to tens of thousands of tonnes per day, so a separate skid facility such as FIG. 2 is used that can simulate the desalination plant without affecting the main plant.

Since the actual reverse osmosis membrane treatment apparatus includes a plurality of reverse osmosis membrane vessels, the skid facility as shown in FIG. 2 employs about one reverse osmosis membrane vessel applied to the actual reverse osmosis membrane treatment apparatus. By examining the degree of membrane fouling of one reverse osmosis membrane vessel, the degree of membrane contamination of the reverse osmosis membrane vessel is estimated.

However, in this case, due to the fact that the actual reverse osmosis membrane vessel is applied, and that a number of facilities for controlling the raw water input to the vessel is attached, the initial installation cost and operating costs are high, and even difficult to operate, the membrane contamination of the actual reverse osmosis membrane treatment device Does not effectively simulate

(Patent Document 1) Korean Patent Publication No. 10-2011-0089710

(Patent Document 2) Korean Patent Publication No. 10-2014-0016417

(Patent Document 3) Korean Patent Publication No. 10-2010-0057262

(Patent Document 4) Korean Patent Publication No. 10-2013-0081436

(Patent Document 5) Korean Patent Publication No. 10-2014-0076197

(Patent Document 6) Korean Patent Publication No. 10-2014-0054670

(Patent Document 7) Korean Patent Publication No. 10-2013-0085220

(Patent Document 8) Korean Patent Registration No. 10-0811199

(Patent Document 9) Korean Registered Patent No. 10-1318578

(Patent Document 10) Korean Patent Publication No. 10-2011-0102750

(Patent Document 11) Korean Patent Publication No. 10-2014-0037357

Accordingly, the present invention is to propose a device and method that can effectively and accurately monitor the degree of membrane fouling of the reverse osmosis membrane in the reverse osmosis membrane treatment process as described above.

Particularly, the membrane fouling of raw water, the organic membrane fouling, inorganic membrane fouling, and biological substances generated in the vessels generated from desalination water treatment facilities operated at high pressure with nanofiltration (NF) membrane and reverse osmosis (RO) membrane. A small continuous desalination apparatus and method for monitoring membrane fouling in real time and reproducing membrane fouling are proposed.

Meanwhile, referring to FIG. 1B, the reverse osmosis membrane vessel is described in more detail. Generally, 3 to 10 separator elements are continuously integrated. FIG. 1B shows an example composed of seven separator elements, but is not limited thereto. The first and last elements are important here. The first lead element has the largest amount of water to be treated and causes a membrane fouling phenomenon in which particle membrane fouling and organic (biological) membrane fouling dominate. The last end element (end element) is accelerated by the filtration of the previous elements to increase the osmotic pressure to the least amount of water treatment, inorganic (scale) membrane fouling is the dominant membrane fouling phenomenon is different. The present invention proposes an apparatus and method for predicting effective and accurate membrane fouling phenomenon by sufficiently reflecting these characteristics.

In addition, in the example of FIG. 1B, the middle element from the second element to the sixth element is an element of a membrane contamination process, and thus, in order to simulate this, a filtration cycle of rapid and sequential cyclic repetition is simulated. Since it is desirable to have, it is to propose a device and method for rapid prediction through this.

In order to solve the above problems, an embodiment of the present invention, the influent storage unit 100; And an inflow water stored in the inflow water storage unit 100, and an RO treatment simulation unit 300 that divides the reverse osmosis membrane vessel into RO treatment and divides the treated water and concentrated water into the RO treatment simulation unit 300. The concentrated water separated from) is re-introduced into the inflow water storage unit 100, and the RO treatment simulation unit 300 includes a first RO cell 310, a second RO cell 320, and a third RO cell 370. And inflow water from the influent storage unit 100 according to the water level of the influent storage unit 100, wherein the first RO cell 310, the second RO cell 320, and the third RO cell ( 370) proposes a real-time membrane fouling monitoring device in the reverse osmosis membrane vessel.

In addition, the first RO cell 310, the second RO cell 320, and the third RO cell 370 are preferably separated from each other.

In addition, a valve (V1) provided in the line inflowing the inflow water into the inflow water storage unit 100; A valve (V2) provided in a line drained from the inflow water storage unit (100); Valves (V3, V4, V5) respectively provided in a line into which the inflow water flows into the first RO cell 310, the second RO cell 320, and the third RO cell 370; And a high pressure pump (HP) provided in a line through which the inflow water flows out from the inflow water storage unit 100.

In addition, the valves (V1, V2, V3, V4, V5) is opened and closed depending on the level of the influent storage unit 100, the high-pressure pump (HP) of the influent storage unit 100 It is preferable that the operation is determined by the water level.

In addition, it is preferable to further include a water level sensor (LS) for detecting the water level of the influent storage unit 100.

In addition, the RO treatment simulation unit 300 further includes a treatment water storage unit 400 for storing the processed water, and by detecting the water level of the treated water storage unit 400, the inflow water storage unit 100 It is preferable that the level of is calculated.

In addition, the water temperature control device for adjusting the raw water temperature in the inlet water storage unit (H); And it is preferable to further include a driver (M) for stirring the raw water in the inflow water storage unit (100).

In order to solve the above problems, another embodiment of the present invention, the above-described monitoring device; Pre-processing unit 10 is pre-processed by the raw water flow; A pretreatment unit 20 into which pretreatment water flows from the pretreatment unit 10; And a RO processing unit 30 which pretreatment water flows from the pretreatment unit 20 and is RO treated to discharge the treated water. The RO processing unit 30 is a reverse osmosis membrane vessel, and includes a plurality of RO elements connected to each other ( 31 to 37, wherein the plurality of RO elements 31 to 37 may include a lead element 31 at which the pretreatment water is introduced, an end element 37 at which the concentrated water is discharged, and It is composed of a plurality of middle elements 32 to 36 positioned between the lead element 31 and the end element 37, and the second RO cell 320 of the RO processing simulation unit 300. The ratio of) corresponds to the ratio of the plurality of middle elements 32 to 36 in the RO processing unit 30.

In addition, the reduced ratio of the current water level relative to the total water level of the influent storage unit 100, preferably corresponds to the recovery rate of the RO processing unit 30.

In addition, the inflow water stored in the inflow water storage unit 100 of the real-time membrane fouling monitoring device is preferably the same as the pretreatment water flowing into the RO processing unit 30.

In order to solve the above problems, another embodiment of the present invention, (a) when the water level of the inflow water storage unit 100 is a predetermined full water level (L0), the inflow water to the first RO cell 310 Incoming step; (b) when the water level of the inflow water storage unit 100 is a predetermined first water level L1, the inflow into the first RO cell 310 is stopped, and the inflow water flows into the second RO cell 320. ; And (c) when the water level of the inflow water storage unit 100 is the preset second water level L2, the inflow into the second RO cell 320 is stopped, and the inflow water flows into the third RO cell 370. It provides a real-time membrane fouling monitoring method comprising the steps.

In addition, after the step (c), (d) when the water level of the inflow water storage unit 100 is the third level L3, the inflow into the third RO cell 370 is stopped, the inflow water storage It is preferable to further include the step of draining the fluid remaining in the portion (100).

In addition, before the step (a), (0) further comprises the step of introducing the raw water into the inflow water storage unit 100 so that the water level of the inflow water storage unit 100 reaches a preset full water level (L0). It is preferable.

In addition, the (0) step, the control unit includes the step of opening the valve (V1), the step (a), the control unit opens the valve (V3) to operate the high pressure pump (HP) Wherein the step (b) includes the step of opening the valve V4 and closing the valve V3, and the step (c) includes the opening of the valve V5. Closing the valve V4, and the step (d) includes the control unit stopping the operation of the high pressure pump HP, opening the valve V2, and closing the valve V5. It is preferred to include the step.

In addition, after the step (d), after confirming that all the fluid remaining in the influent storage unit 100 is drained, it is preferable to return to the step (0).

In addition, it is preferable that the membrane contamination state of the RO processing unit 30 is detected according to the membrane contamination state of the RO processing simulation unit 300.

Through the present invention in real time directly through a continuous desalination apparatus equipped with three small cells having a membrane area of several hundred times smaller than the commercial separation membrane and the amount of treated water and membrane contamination flowing into the reverse osmosis membrane vessel of the actual desalination plant Can be monitored and reproduced

Through this, it is possible to provide information according to the membrane fouling characteristics in the vessel so that it can be applied to the desalination plant which is the actual main treatment process at the time of cleaning to remove the membrane fouling, it is possible to effectively apply the physical cleaning and chemical cleaning methods .

As a result, it is possible to minimize the cleaning time, input manpower, chemical usage, the amount of cleaning waste generated during the cleaning process through the present invention can achieve a significant economic savings of the stable operation of the entire desalination plant operation and maintenance costs .

Figure 1a is a conventional general reverse osmosis membrane device, in particular a conceptual diagram for explaining the seawater desalination process.

FIG. 1B is a conceptual view for explaining the elements in the RO processing unit which is the reverse osmosis membrane vessel forming the reverse osmosis membrane device shown in FIG. 1A.

2 is a photograph of a reverse osmosis membrane skid, which is a conventional apparatus for monitoring membrane fouling of a reverse osmosis membrane vessel.

3 is a conceptual diagram illustrating a real-time membrane fouling monitoring apparatus according to the present invention.

4a and 4b are photographs for explaining the RO cell of the real-time membrane fouling monitoring apparatus according to the present invention.

5 is a flowchart illustrating a real-time membrane fouling monitoring method according to the present invention.

6 is a table for explaining the operation of the valve and the high-pressure pump in order to explain the real-time membrane fouling monitoring method according to the present invention.

Hereinafter, "raw water" means a fluid introduced to be filtered in the reverse osmosis membrane vessel. In the seawater desalination apparatus, raw water may be seawater, but the monitoring apparatus according to the present invention is not limited thereto.

Hereinafter, the "influent water" flowing into the RO simulation processing unit is a concept of the same fluid as the fluid flowing into the RO processing unit of the actual reverse osmosis membrane vessel.

Hereinafter, "RO element" refers to a unit constituting the reverse osmosis membrane vessel, and may also be referred to as "RO module".

Hereinafter, the "level sensor (LS)" does not mean only means for detecting the level of the influent, but means all means for detecting information such as water level, weight, flow rate, for example, water level sensor, weight sensor, It may include a flow meter, but is not limited thereto.

1. Description of real-time membrane fouling monitoring device in reverse osmosis membrane vessel

Referring to Figure 3, the real-time membrane fouling monitoring apparatus in the reverse osmosis membrane vessel according to the present invention.

First, the reverse osmosis membrane treatment apparatus will be described.

3, the general reverse osmosis membrane treatment apparatus is shown. As described above with reference to Figure 1a, it can be applied to any conventional reverse osmosis membrane treatment apparatus. The pretreatment unit 10 into which the raw water is introduced, the pretreatment unit 20 into which the pretreatment pretreated water is introduced, and the RO treatment unit 30 into which the pretreatment pretreated water is introduced to perform reverse osmosis membrane filtration.

The RO processor 30 may be referred to as a reverse osmosis membrane vessel, and is composed of a plurality of elements 31 to 37 as shown in FIG. 1B. In general, one reverse osmosis membrane vessel is composed of 3 to 10 elements, which will be described here as an example of 7 elements.

The RO elements 31 to 37 are the lead elements 31 at which the pretreatment water flows in, the end elements 37 at the end of which the treated water flows out, and a plurality of middle parts disposed therebetween. Middle elements 32 to 36. There are five middle elements 32 to 36 shown, but there is no limit to the number as described above.

Here, the lead element 31 and the end element 37 are important. Since the pretreatment water passes through each element sequentially, the membrane fouling pattern of the two elements is significantly different after a long time since the reverse osmosis membrane treatment apparatus is operated.

The membrane fouling state of the lead element 31 into which pretreatment water flows in immediately, and the end element 37 which flows in after some treatment in the elements of the front end is inevitably different.

It is very important to check the degree of element contamination at the very end and the end even in the actual site where the membrane contamination status of the reverse osmosis membrane treatment device should be checked and the cleaning timing and cycle should be determined.

Looking at the specific membrane fouling pattern, the lead element 31 into which the pretreatment water flows is mainly made of particle fouling and organic membrane fouling. In the case of the end element 37 of the last end, inorganic membrane fouling (scaling) is mainly performed.

Therefore, in view of the above, the present invention separates the first RO cell 310 corresponding to the lead element 31 and the third RO cell 370 corresponding to the end element 37 separately. Middle elements 32 to 36 between are set to one second RO cell 320.

Here, the size of the second RO cell 320 is set corresponding to the size or capacity of the middle element (32 to 36) to check the actual film contamination state.

An apparatus for real-time membrane fouling monitoring by simulating the reverse osmosis membrane treatment apparatus described above will be described.

The real-time membrane fouling monitoring apparatus according to the present invention is operated at the same level by reducing only the absolute amount of the treatment compared to the reverse osmosis membrane treatment apparatus in operation. That is, by checking the membrane fouling degree of each RO cell (310, 320, 370) of the RO treatment simulation unit 300 according to the present invention, the membrane fouling degree of the reverse osmosis membrane treatment device in operation is not decomposed or analyzed. It can be estimated without any need, and a cleaning method for obtaining an optimal cleaning effect can also be estimated.

The core component having such a function is the RO processing simulation unit 300. This works by simulating the processing of the RO processing unit 30 of the actual reverse osmosis membrane treatment apparatus.

As described above, the first RO cell 310 corresponding to the lead element 31 of the RO processor 30, the third RO cell 370 corresponding to the end element 37, and the middle element 32 therebetween. 36 consists of one second RO cell 320.

4A and 4B show the membrane that constitutes the

RO cells

310, 320, 370.

4A is an illustration of a spiral wound membrane among reverse osmosis membranes. Inside this kind of a number of membranes are wound, the

RO cells

310, 320, 370 are constructed using a membrane section cut a portion of which is small.

That is, as shown in Figure 4b, by cutting a portion of the reverse osmosis membrane to prepare a membrane section, by attaching the housing (bottom left side of Figure 4b) and setting the flow path to the top and bottom thereof, shown in the lower right of Figure

4b RO cells

310, 320, 370 as described above may be configured.

In the example shown at the bottom right of FIG. 4B, a total of three

RO cells

310, 320, and 370 are provided, and each housing size is similar. Among these, the center RO cell corresponds to the second RO cell 320, and by adjusting the size of the membrane section included therein, the size corresponds to the size, number, or capacity of the middle elements 32 to 36 as described above. To match.

In other embodiments, the size of the plurality of membrane sections may be similar, but a plurality of second RO cells 320 may be used or stacked.

By using the proportional to the size of the membrane, if the inflow of the amount corresponding to the raw water (or pre-treatment water) to be injected into the reverse osmosis membrane treatment apparatus is injected into the RO treatment simulation unit 300 configured as described above, as a result, the RO treatment simulation unit 300 Membrane contamination progress of the) is made similar to the membrane contamination progress of the RO treatment unit 30 of the actual reverse osmosis membrane treatment apparatus.

Now, the inflow water storage unit 100 in which the inflow water flowing into the RO processing simulation unit 300 is stored will be described.

In order for the RO treatment simulation unit 300 to approximate the RO treatment unit 30, it is preferable that the pretreatment water injected into the RO treatment unit 30 is used as the inflow water.

Inflow water storage unit 100, a water temperature control device (H) for adjusting the raw water temperature, may be provided with a driver (M) for stirring the raw water. By controlling the temperature and the degree of stirring by using a separate controller (not shown), the RO processing simulation unit 300 can approximate the RO processing unit 30.

The inflow water introduced from the inflow water storage unit 100 to the RO processing simulation unit 300 is controlled by sensing the level of the inflow water storage unit 100. The inflow water storage unit 100 is provided with a water level sensor (LS) for detecting the water level.

In addition, a valve V1 is provided in a line into which the influent flows into the influent storage unit 100, another valve V2 is provided in a line draining from the influent storage unit 100 and the first RO cell 310. The second RO cell 320 and the third RO cell 370 are provided with different valves V3, V4, and V5 respectively in the inflow line.

In addition, a separate high pressure pump HP is further provided in a line into which the inflow water flows into the first RO cell 310, the second RO cell 320, and the third RO cell 370.

The controller (not shown) adjusts the valves V1, V2, V3, V4, and V5 and the high pressure pump HP according to the level of the influent storage unit 100.

When RO treatment is performed in the RO treatment simulation unit 300, the influent is divided into concentrated water and treated water. Treated water is stored in a separate treated water storage unit 400, it is important that the concentrated water must be re-introduced back to the inlet water storage unit (100). This is because the concentrated water must be re-introduced to simulate the degree of membrane fouling for each element as described above.

On the other hand, since the concentrated water is re-introduced, the water level of the inflow water storage unit 100 eventually corresponds to the amount of treated water stored in the treated water storage unit 400, that is, the change in the water level of the inflow water storage unit 100 Corresponding to the recovery rate of the RO treatment simulation unit 300, and in other words, it may correspond to the treatment amount or the concentration rate of the RO treatment simulation unit 300.

Therefore, by controlling according to the water level of the influent storage unit 100 according to a preset ratio of the influent flowing into the RO processing unit 300, the RO processing unit 300 corresponds to the throughput of the actual RO processing unit 30. Throughput can be controlled, through which the membrane contamination progress of the RO treatment simulation unit 300 will proceed in accordance with the membrane contamination progress of the RO processing unit (30).

In another embodiment, since the decrease in the water level of the influent storage unit 100 corresponds to the increase in the water level of the treated water storage unit 400, a separate sensor (not shown) is provided in the treated water storage unit 400 and based on this. By estimating the water level of the influent storage unit 100 may control the valve and the high pressure pump.

2. Description of real-time membrane fouling monitoring method in reverse osmosis membrane vessel

5 and 6 will be described a real-time membrane fouling monitoring method according to the present invention. 6 illustrates the opening and closing of the valves V1, V2, V3, V4, and V5 controlled by the controller (not shown) and the operation of the high pressure pump HP. In the following description, the expression of the controller will be omitted.

First, as a preparation step, the inlet water is introduced into the influent water storage unit 100 by opening the valve V1 (S10). Inflow water is preferably a pre-treatment water in the same way as flowing into the RO processing unit (30). When the water level of the inflow water storage unit 100 reaches the preset full water level L0 (S20), the valve V1 is closed.

Inflow water flows into the first RO cell 310 that simulates the lead element 31 (S100). For this purpose, the valve V3 is opened and the high pressure pump HP is operated.

When the influent flows in, the RO treatment is performed in the first RO cell 310 to be divided into the treated water and the concentrated water, the treated water is stored in the treated water storage unit 400, and the concentrated water is returned to the influent storage unit 100. Inflow. In this process, the membrane contamination of the first RO cell 310 proceeds, and the water level of the influent storage unit 100 gradually decreases.

When the water level of the influent storage unit 100 is lowered to a predetermined level L1 (L110), since the first RO cell 310 has a predetermined amount of membrane contamination, the flow proceeds to the second RO cell 320. do.

Inflow water flows into the second RO cell 320 that simulates the middle elements 32 to 36 (S200). To this end, the valve V4 is opened and the valve V3 is closed. The high pressure pump (HP) is still in operation.

At this time, the influent flowing in is different from the pretreated water flowing into the first RO cell 310, and thus, the inflow water including the concentrated water separated from the treated water in the first RO cell 310 is actually a middle element 32 to 36. Similar to the influent flow into).

When the influent flows in, the RO treatment is performed in the second RO cell 320 to be divided into the treated water and the concentrated water, the treated water is stored in the treated water storage unit 400, and the concentrated water is re-used in the influent storage unit 100. Inflow. In this process, the membrane contamination of the second RO cell 320 proceeds, and the water level of the influent storage unit 100 gradually decreases.

When the water level of the influent storage unit 100 is lowered up to a predetermined level L2 (L210), since the second RO cell 320 has a predetermined amount of membrane contamination, the flow proceeds to the third RO cell 370. do.

Finally, inflow water flows into the third RO cell 370 that simulates the end element 37 (S300). To this end, the valve V5 is opened and the valve V4 is closed. The high pressure pump (HP) is still in operation.

At this time, the influent flowing in, unlike the influent flowing into the first RO cell 310 or the inflow flowing into the second RO cell 320, the influent includes a concentrated water separated from the treated water in the second RO cell (320). Influent, similar to the inflow into the actual end element 37.

When the influent flows in, the RO treatment is performed in the third RO cell 370 to be divided into the treated water and the concentrated water. Inflow. In this process, the membrane contamination of the third RO cell 370 proceeds, and the water level of the influent storage unit 100 gradually decreases.

When the water level of the inflow water storage unit 100 is lowered to a predetermined level L3 (L310), the third RO cell 320 has all of the membrane contaminations set in advance.

As such, once all of the cycles are completed, the valve V5 is closed, the high pressure pump HP is stopped, and the valve V2 is opened to drain the influent storage 100 (S500).

If further operation is required (S600), the process proceeds to step S10 again.

In the present specification, the present invention has been described with reference to the embodiments shown in the drawings so that those skilled in the art can easily understand and reproduce the present invention, which is merely exemplary, and those skilled in the art can make various modifications and equivalents from the embodiments of the present invention. It will be appreciated that embodiments are possible. Therefore, the protection scope of the present invention will be defined by the claims.

(Explanation of the sign)

10: pre-processing unit

20: preprocessing unit

30: RO processing unit

31, 32, 33, 34, 35, 36, 37: RO element

100: influent storage unit

300: RO treatment replica

310: first RO cell

320: second RO cell

370: third RO cell

400: treated water storage unit

V1, V2, V3, V4, V5: Valve

HP: High Pressure Pump

LS: water level sensor

H: water temperature controller

M: Driver

Claims

Influent storage unit 100; And

Inflow water stored in the inflow water storage unit 100 is introduced, and includes a RO treatment simulation unit 300 for simulating the reverse osmosis membrane vessel and RO treatment to separate the treated water and concentrated water,

The concentrated water separated by the RO treatment simulation unit 300 is re-introduced into the influent storage unit 100,

The RO processing simulation unit 300 includes a first RO cell 310, a second RO cell 320 and a third RO cell 370,

According to the water level of the influent storage unit 100, inflow water from the influent storage unit 100 is any one of the first RO cell 310, the second RO cell 320, and the third RO cell 370. Influx,

Real-time membrane contamination monitoring device in reverse osmosis membrane vessel.
The method of claim 1,

The first RO cell 310, the second RO cell 320 and the third RO cell 370 are separated from each other,

Real-time membrane contamination monitoring device in reverse osmosis membrane vessel.
The method of claim 2,

A valve (V1) provided in a line through which the inflow water flows into the inflow water storage unit 100;

A valve (V2) provided in a line drained from the inflow water storage unit (100);

Valves (V3, V4, V5) respectively provided in a line into which the inflow water flows into the first RO cell 310, the second RO cell 320, and the third RO cell 370; And

Further comprising a high pressure pump (HP) provided in the line from which the inflow water is discharged from the inflow water storage unit 100,

Real-time membrane contamination monitoring device in reverse osmosis membrane vessel.
The method of claim 3, wherein

The valves V1, V2, V3, V4, and V5 are opened and closed according to the level of the influent storage unit 100, and the high pressure pump HP is based on the level of the influent storage unit 100. Whose operation is determined,

Real-time membrane contamination monitoring device in reverse osmosis membrane vessel.
The method of claim 3, wherein

Further comprising a water level sensor (LS) for detecting the water level of the inflow water storage unit 100,

Real-time membrane contamination monitoring device in reverse osmosis membrane vessel.
The method of claim 3, wherein

Further comprising a treated water storage unit 400 for storing the processed water processed by the RO treatment simulation unit 300,

By detecting the water level of the treated water storage unit 400, the water level of the influent water storage unit 100 is calculated,

Real-time membrane contamination monitoring device in reverse osmosis membrane vessel.
The method of claim 3, wherein

A water temperature control device (H) for controlling the raw water temperature in the inflow water storage unit 100; And

Further comprising a driver (M) for stirring the raw water in the inflow water storage unit 100,

Real-time membrane contamination monitoring device in reverse osmosis membrane vessel.
A real-time membrane fouling monitoring apparatus according to any one of claims 3 to 7;

Pre-processing unit 10 is pre-processed by the raw water flow;

A pretreatment unit 20 into which pretreatment water flows from the pretreatment unit 10; And

It includes a RO processing unit 30 for pre-treatment water flows from the pre-treatment unit 20 to RO treatment to flow out the treated water,

The RO processor 30 is a reverse osmosis membrane vessel, and is composed of a plurality of RO elements 31 to 37 connected to each other.

The plurality of RO elements 31 to 37 may include a lead element 31 at which the pretreatment water is introduced, an end element 37 at which concentrated water flows out, and the lead element 31 and the lead element 31. It consists of a plurality of middle elements (32 to 36) positioned between the end element 37,

The ratio of the second RO cell 320 of the RO processing unit 300 corresponds to the ratio of the plurality of middle elements 32 to 36 of the RO processing unit 30,

Reverse osmosis membrane treatment device.
The method of claim 8,

The reduced ratio of the current water level relative to the total water level of the inflow water storage unit 100 corresponds to the recovery rate of the RO processing unit 30,

Reverse osmosis membrane treatment device.
The method of claim 8,

The inflow water stored in the inflow water storage unit 100 of the real-time membrane fouling monitoring device is the same as the pretreatment water flowing into the RO processing unit 30,

Reverse osmosis membrane treatment device.
A method for detecting membrane fouling of a reverse osmosis membrane vessel in a reverse osmosis membrane treatment apparatus according to claim 8,

(a) when the water level of the inflow water storage unit 100 is a predetermined full water level (L0), inflow water flows into the first RO cell 310;

(b) when the water level of the inflow water storage unit 100 is a predetermined first water level L1, the inflow into the first RO cell 310 is stopped, and the inflow water flows into the second RO cell 320. ; And

(c) when the water level of the inflow water storage unit 100 is the preset second water level L2, the inflow into the second RO cell 320 is stopped, and the inflow water flows into the third RO cell 370. Including,

Real time membrane contamination monitoring method.
The method of claim 11,

After step (c),

(d) When the level of the inflow water storage unit 100 is the third level L3, the inflow into the third RO cell 370 is stopped, and the remaining fluid in the inflow water storage unit 100 is drained. Further comprising the steps,

Real time membrane contamination monitoring method.
The method of claim 12,

Before step (a) above,

(0) further comprising the step of introducing the raw water into the inflow water storage unit 100 so that the water level of the inflow water storage unit 100 reaches a preset full water level (L0),

Real time membrane contamination monitoring method.
The method of claim 13,

Step (0) includes the step of the control unit to open the valve (V1),

The step (a) includes the step of operating the high pressure pump HP by the control unit opening the valve V3,

The step (b) may include the step of the control unit opening the valve (V4), closing the valve (V3),

The step (c) includes the control unit opening the valve V5 and closing the valve V4, and

The step (d) includes the step of the control unit stopping the operation of the high pressure pump HP, opening the valve V2 and closing the valve V5,

Real time membrane contamination monitoring method.
The method of claim 14,

After the step (d),

After confirming that all the remaining fluid in the inflow water storage unit 100 is drained, returning to step (0),

Real time membrane contamination monitoring method.
The method of claim 11,

According to the membrane fouling state of the RO processing simulation unit 300, the membrane fouling state of the RO processing unit 30 is detected,

Real time membrane contamination monitoring method.