KR101161327B1 - Water purifying system for improving discharge water quality with membrane - Google Patents

Abstract

The present invention relates to a effluent water quality improved water purification system by membrane filtration that can improve the water quality of the effluent discharged from the water purification system, the impregnation well (1), mixed paper (2), flocculation paper (3), sedimentation basin (4) ), The discharge water in the water purification system consisting of filter paper (5), water purification paper (6), discharge resin (10), bassler support (20), concentration tank (30), membrane filtration device (40) and dehydrator (50), Piping line 100 to take the symbol water of the resin (10); And a symbol number of the discharge tank 10 which is installed in a pipe for supplying the symbol water of the concentration tank 30 to the membrane filtration device 40 and is taken into the pipe line 100. Symbol water mixer 200 to be mixed with the water supplied to the membrane filter device 40; is configured to add, to filter the contaminants remaining in the symbol water of the concentration tank (30) to improve the quality of the effluent water It is effective, and thus can be utilized as a water without discharging, and also reduces the fouling (fouling) that causes the clogging of the membrane filter device 40 by agglomerating contaminants, thereby driving the membrane filter device 40. It also has the advantage of increasing efficiency.

Description

Water quality improvement type water purification system by membrane filtration {WATER PURIFYING SYSTEM FOR IMPROVING DISCHARGE WATER QUALITY WITH MEMBRANE}

The present invention relates to a effluent water quality improved water purification system by membrane filtration that can improve the water quality of the effluent discharged from the water purification system, and more particularly, sludge discharged from the backwash effluent of the filter paper and sludge discharged from the sedimentation basin. The present invention relates to an improved effluent water quality purification system by membrane filtration in which the symbol water of the backwash effluent is mixed with the symbol water of the thickening tank in the process of treating the same with the concentration tank and the membrane filtration device.

In general, a water purification system is a system for supplying clean water by receiving raw water mixed with contaminants.

1 is a system of a conventional water purification system, and as shown, a conventional water purification system includes a landing well (1) for supplying raw water and storing the mixed water (2) in the rear stage; A mixed paper (2) which mixes and administers a flocculant to the raw water to be supplied; A flocculating paper 3 which flocculates the pollutant by flocculating the raw water mixed with the flocculant; A settling basin 4 for precipitating aggregated contaminants; A filter paper 5 for collecting and filtering the supernatant water of the settling paper 4; It is configured to include; purified water (6) for purifying the filtered water supplied to the outside.

In addition, the conventional water purification system, the discharge resin (10) for storing the backwash discharged water discharged when the filter paper (5) is periodically backwashed and recovering the symbolic water to the landing well (1); A sludge support 20 for recovering the sediment of the discharge resin 10 and recovering and storing the sludge precipitated in the sedimentation basin 4; A concentrating tank (30) for concentrating the sludge stored in the slurry support (20), and a membrane filtration device (40) for filtration by filtration of the symbolic water of the concentrating tank (30); The dewatering sludge of the thickening tank 30 is discharged in the form of a cake, and after dehydration, the filtrate passes through the bastler support 20 or directly to the thickening tank 30.

Such discharge resin (10), bassler support (20), concentration tank (30), membrane filtration device (40) and dehydrator (50) filter out contaminants such as sediment generated during water purification process and discharged into effluent and dewatering cake. In addition, the backwash effluent generated in the filter paper 5 is relatively clean and coagulant remains to recover the supernatant water into the raw water tank 1.

However, the conventional water purification system is configured to filter the symbol water of the concentration tank 30 as it is, fouling (fouling) generated in the separation membrane of the membrane filtration device 40 by foreign matter contained in the symbol water of the concentration tank 30. ) Rapidly increases, and, as a result, a difference in front and rear pressure of the separator also increases rapidly, and the amount of water passing through the membrane also decreases. Therefore, the backwashing means of the membrane had to be operated at short intervals, which entailed a problem of delaying the membrane filtration process of the symbolic water and not fully utilizing the processing capacity. In addition, even when the membrane is washed, it is difficult to clean and replace or replace the membrane periodically as the residual foreign matter adhering to the membrane continues to accumulate.

In addition, in order to solve the water quality problem of the effluent, the separation membrane having high filtration performance should be used, but the purchase cost also increases, and it is difficult to increase the number of backwashes by filtering many contaminants.

In addition, in the conventional water purification system, as the membrane filtration device 40 is frequently backwashed, the number of backwash water discharged to the wandering support 20 increases, so that the design capacity of the backwasher 20 and the concentration tank 30 is increased. There was also the difficulty of raising more than necessary.

KR 10-2010-0004402 A 2010.01.13.

Therefore, an object of the present invention is to improve the water quality of the effluent water filtered and discharged by the membrane filter device 40, and also reduce the fouling generated in the membrane filter device 40, thereby reducing the number of backwashes. In order to minimize the delay time in the membrane filtration process, the amount of backwash water of the membrane filtration device 40 may be reduced, thereby reducing the capacity of the sludge support 20 and the concentration tank 30. The present invention provides an improved water purification system for effluent water by membrane filtration.

In order to achieve the above object, the present invention, the raw water is treated with a water treatment well (1), mixed paper (2), flocculation paper (3), sedimentation paper (4), filter paper (5) and water purification paper (6), the filter paper (5) to store the backwash discharged water and the discharge resin (10) for recovering the symbolic water to the landing well (1), and to collect and store the sludge of the discharge resin (10) and the settling sludge of the sedimentation basin (4) And a membrane filtration device (40) for filtration and discharging the bast support (20), the concentration tank (30) for concentrating the settling sludge of the bast support (20), and the supernatant of the concentration tank (30); In the water purification system comprising a sludge of the concentration tank (30) and a dehydrator (50) for dewatering the filtrate filtered from the membrane filter (40), the piping line (100) for taking in the symbol water of the discharge resin (10) ); And installed in the pipe for supplying the symbol water of the concentration tank 30 to the membrane filtration device 40, the symbol water of the discharge resin (10) withdrawn into the pipe line 100 of the concentration tank (30) It is characterized in that it further comprises; a symbol water mixer 200 to be mixed with the symbol water supplied to the membrane filtration device (40).

The symbol water mixer 200 is provided with a flow control valve 210 at a connection portion with the pipe line 100 to preset the symbol number of the concentration tank 30 and the symbol number of the discharge resin 10. It is characterized by mixing at a mixing ratio.

Therefore, the present invention configured as described above, because the symbol water of the discharge resin 10 is mixed with the symbol water of the concentration tank 30, the concentration tank 30 by the coagulant remaining in the symbol water of the discharge resin (10). By condensing the contaminants remaining in the symbolic water of the filter to achieve the effect of opening the water quality of the discharged water, and thus has the advantage that can be utilized as water without discharging the discharge water of the membrane filtration device (40).

In addition, the present invention is configured to mix and coagulate contaminants remaining in the symbolic water of the concentration tank 30 with the remaining coagulant of the discharge resin 10 to be supplied to the membrane filter device 40, so that the membrane filter device 40 is generated. It is possible to significantly reduce the amount of fouling (fouling) to be, thereby significantly increasing the operating efficiency of the membrane filtration device 40 compared to the conventional water purification system, utilizing the symbol water of the discharge resin (10), In addition, since the mixing of the liquid phase is well mixed, it has the advantage that the condensation effect is also simple enough as a pretreatment process.

1 is a system diagram of a conventional water purification system.
Figure 2 is a system diagram of the improved water quality of the effluent water by membrane filtration according to an embodiment of the present invention.
3 is a membrane filtration device (40) by varying the mixing ratio of the symbol water of the concentration tank 30 and the symbol water of the discharge resin 10 in the effluent water quality improved water purification system by membrane filtration according to an embodiment of the present invention (40) ), A graph showing the differential pressure before and after the separation membrane generated in the membrane filter device (40).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are used to denote the same or similar components in other drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Figure 2 is a system diagram of the improved water quality of the effluent water by membrane filtration according to an embodiment of the present invention.

As shown, the effluent water quality improved water purification system by membrane filtration according to an embodiment of the present invention, the incoming water is discharged from the water well (1), mixed paper (2), flocculation paper (3), sedimentation paper (4), filter paper (5) and the purified water obtained by treating with the purified paper (6) to the outside, and the wastewater discharged from the backwashing discharged from the backwashing process of the sludge discharged from the sedimentation basin (4) and the filter paper (5) In order to discharge later, it comprises a discharge resin 10, the wandering support 20, the membrane filter 40 and the dehydrator 50.

Since the configuration of the impingement (1), mixed paper (2), flocculation paper (3), sedimentation paper (4), filter paper (5) and water purification paper (6) is a known technique can understand the embodiments of the present invention The level is briefly described as follows.

That is, the water purification process stores the raw water introduced from the outside in the landing well (1) to adjust the flow rate of the raw water to be purified, injecting the flocculant into the raw water in the mixing paper (2) and mixed it with a mixer (not shown) micro A floc is formed, and a floc is formed by performing a flocculation process of increasing the volume of the generated microfloc in the flocculation paper 3.

Next, the floc formed in the flocculation paper 3 is precipitated using the settling paper 4, the supernatant water is extracted and passed through the filter media 5, and then purified by the purified paper 6 and discharged.

Further, during the process of obtaining purified water from raw water, the discharge resin 10 for treating the sludge generated in the sedimentation basin 4 and the backwash discharged water generated in the filter paper 5, the sludge support 20, the concentration tank 30 The membrane filter device 40 and the dehydrator 50 will also be briefly described as follows.

The discharge resin 10 is backwashed when the filter paper 5 is backwashed using clean water such as water filtered by the filter paper 5 or water purified by the water purification paper 6. The discharged water is collected, stored and stabilized, and the symbol water of the stabilized backwash discharged water is recovered to the landing well 1 to be joined to the raw water. That is, the symbol water generated here is clean water compared to the raw water to be purified, and furthermore, the symbol water of the discharge resin 10 is mixed with the coagulant introduced from the mixed paper 2 to be recycled without discarding the coagulant. There is also a side. In addition, the sludge that is precipitated as the backwash discharged water is stabilized in the discharge resin 10 is supplied to the slurry support 20 to be described later.

The waste sludge support 20 collects and stores sediment sludge discharged from the discharge resin 10 and sediment sludge discharged from the sedimentation basin 4, and adjusts the amount of sludge to concentrate the rear tank 30. To supply. On the other hand, the backlash 20 is piped so as to recover the washing water of the membrane filter 40 to be described later and the desorption filtrate of the dehydrator 50 to be described later.

The concentration tank 30 concentrates the sludge supplied from the slurry support 20 and supplies the concentrated sludge to the dehydrator 50 which will be described later, and the membrane filtration device 40 which will describe the symbol water generated in the concentration process. Supply to

The membrane filtration device 40 discharges the symbol water of the concentration tank 30 through a separation membrane (not shown). The membrane filtration device 40 recovers the backwashing water generated by periodically backwashing and backwashing the filtrate (foreign material) filtered through the separation membrane (not shown) to the wandering support 20 to the concentration tank ( Have a concentration process according to 30).

The dehydrator 50 dehydrates the concentrated sludge of the concentration tank 30 to separate the dewatering cake and the desorption filtrate. The dewatering cake is discharged and the dehydration liquid is recovered to the bastler support 20.

The present invention is configured by additionally installing the pipe line 100 and the symbol water mixer 200 in the water purification system configured as described above.

The pipe line 100 is a pipe installed to take the symbol water of the discharge resin 10 and supply it to the symbol water mixer 200. That is, although the discharge resin 10 may recover the symbol water to the watering well 1, some of the symbol water is piped to be supplied to the symbol water mixer 200 by the pipe line 100.

The symbol water mixer 200 is installed in a pipe connecting between the concentrating tank 30 and the membrane filtration device 40, and is also connected to the pipe line 100, so that the membrane from the concentrating tank 30 The symbol water of the discharge resin 10 is mixed with the symbol water of the concentration tank supplied to the filtration device 40. That is, the symbol water mixer 200 according to the present invention mixes the symbol water of the discharge resin 10 with the symbol water of the concentration tank 30 and utilizes the flocculant remaining in the symbol water of the discharge resin 10, the concentration tank. The contaminants contained in the symbol water of (30) are aggregated, and after condensation of the contaminants is performed by the symbol water mixer 200, the contaminants are added to the membrane filter device 40.

The symbol water mixer 200 may also be configured as a structure in which two pipes are connected by a joining pipe connection method, or the symbol water of any one of the concentration tank 30 symbol water and the discharge resin 10 symbol water. It can also be composed of a structure injecting the other symbolic water from the top through a single input slot or a plurality of input holes while flowing. In addition, the symbol water mixer 200 may be configured to overflow the mixed symbol water in order to facilitate aggregation. However, in the present invention, the symbol water mixer 200 is not limited to the above-listed method, and may be configured in various forms as long as it is a configuration that mixes two symbol numbers.

In addition, the symbol water mixer 200, as shown in the figure, by mounting the flow rate control valve 210 to the connection portion with the pipe line 100 of the symbol water taken in from the discharge resin (10) It can be configured to adjust the flow rate.

In addition, the symbol water mixer 200, as shown, the number of symbols of the concentration tank 220 detected by the flow sensor 220 by mounting the flow sensor 220 in the pipe connected to the concentration tank (30). It may be configured to control the flow control valve 210 according to the inflow amount. That is, the symbol water mixer 200 adjusts the flow rate according to the detection signal of the flow sensor 220 to mix the symbol water of the concentration tank 30 and the symbol water of the discharge resin 10 at a preset mixing ratio. To control the valve 210.

3 is generated before and after the separation membrane of the membrane filter device 40 while changing the mixing ratio when the symbol water of the concentration tank 30 and the symbol water of the discharge resin 10 are mixed and supplied to the membrane filter device 40. It is a graph which shows the difference of the pressure which becomes.

That is, curve 61 is a time-varying curve of differential pressure generated when only the symbol water of the concentration tank 30 is supplied to the membrane filter device without mixing the symbol water of the discharge resin 10,

Curve 62 is a curve of the temporal fluctuation of the differential pressure generated when the mixing ratio of the symbol water of the thickening tank 30 and the symbol water of the discharge resin 10 is "1: 1",

Curve 63 is a curve of temporal fluctuations in the differential pressure generated when the mixing ratio of the thimble tank 30 symbol water and the discharge resin 10 symbol water is "1: 2".

Curve 64 is a curve of temporal fluctuations in the differential pressure generated when the mixing ratio of the thimble tank 30 symbol water and the discharge resin 10 symbol water is "1: 5",

Curve 65 is a time-varying curve of the differential pressure generated when only the symbol water of the discharge resin 10 is supplied to the membrane filtration device 40.

Looking at the curve 61 shown, when only the symbol water of the concentration tank 30 is filtered, the difference in pressure generated before and after the separation membrane is rapidly increased and a certain time elapses, the filtration function is not properly exhibited.

On the contrary, according to the present invention, when the symbol water of the concentration tank 30 and the symbol water of the discharge resin 10 are mixed and filtered in a ratio of "1: 1", as shown by the curve 62, the increase in the differential pressure is increased. It is noticeably slower than curve 61, and only about 10 hours have passed until 5 times of curve 61 to reach a peak, and the pressure difference at that peak is also lower than that of curve 61. Can be.

In addition, when the symbol water of the thickening tank 30 and the symbol water of the discharge resin 10 are mixed in a ratio of "1: 2" according to the present invention, the increase in the differential pressure becomes more gentle and reaches a peak after approximately 15 hours. . When the mixing ratio is "1: 5", the peak pressure is not reached even after 15 hours, and the differential pressure at the time when 15 hours has elapsed is approximately 0.7 kgf / cm 2, and the differential pressure value of the concentrating tank 30 is shown. When only the symbol water is filtered, it corresponds to a differential pressure value when approximately 1 hour and 30 minutes have elapsed, so that a difference of 13 hours and 30 minutes remains.

On the other hand, if only the symbol water of the discharge resin 10 is filtered, it shows that the fluctuations in the differential pressure are more gentle.

In addition, the present invention considers the amount of symbol water generated in the discharge resin 10 and the appropriate amount of symbol water to be collected in the landing well 1 and the amount of symbol water obtained in the concentration tank 30 in operating the water purification system. Based on the data obtained as described above, the flow rate of the discharge resin 10 symbol water mixed with the symbol water of the concentration tank 30, the flow rate control valve 210 shown in FIG. 2, or the flow rate control valve 210 and the flow rate The combination of the sensor 220 can be adjusted.

Thus, by forming the present invention, the low pressure difference of the separation membrane means that there is less clogging of the separation membrane, which in turn means that the amount of fouling adhered to the separation membrane by contaminants is also small.

That is, fouling (fouling) generated during the filtration process is due to the attachment of fine contaminants, and when such contaminants accumulate and adhere to the membrane, the membrane is gradually blocked, thereby increasing the pressure difference measured before and after the membrane. The present invention aggregates these contaminants so that they can be prevented from adhering to the separator. This increases the volume by condensing the contaminants so that they do not adhere even if they are caught in the separation membrane. Furthermore, the volume of the contaminants can penetrate through the gap, so that the flow of the symbolic water is smoother than when the volume of the contaminants is small. In addition, since the aggregated contaminants do not adhere to the separator and are caught in the separator, the backwashing is also well performed.

In addition, since the present invention aggregates and filters fine contaminants remaining in the symbolic water of the concentration tank 30, the present invention can achieve an effect of improving the water quality of the discharged water that has passed through the membrane filtration device 40. Without discharging the water discharged in 40), it can be utilized as water for various purposes, and thus, a zero discharge water purification system can be implemented.

On the other hand, without using the symbol water of the discharge resin (10), the flocculant may be administered to the symbol water of the concentration tank 30 and membrane filtration, but in this case, the administered flocculant should be well mixed with the symbol water and the flocculation effect is also good. Since it has to be elevated, it is difficult to build facilities such as a mixing tank (2) and a coagulation tank (3).

Thus, the present invention, the residual flocculant is mixed and mixed well in the backwash discharge water in the backwashing process of the filter paper 5 and the liquid symbol water in the process of reaching the symbol water mixer 200 via the discharge resin (10) Since it is more well mixed, even without a separate mixing means or flocculating means is mixed in the symbol water of the concentration tank 30 in the form of mixing between the liquid phase, thereby achieving a sufficient aggregation effect.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Therefore, such modifications should also be regarded as belonging to the scope of the present invention, and the scope of the present invention should be determined by the claims below.

DESCRIPTION OF REFERENCE NUMERALS 1 Landing well 2 Mixed paper 3 Aggregate paper
4: sedimentation basin 5: filter paper 6: purified water
10: Outgoing balance 20: Battering support 30: Thickener
40 membrane filter 50 dehydrator
100: piping line
200: symbol water mixer 210: flow control valve 220: flow sensor

Claims (2)

The raw water is treated with an impingement well (1), blended paper (2), flocculated paper (3), sedimentation paper (4), filter paper (5) and water purification paper (6), and the backwashing effluent of the filter paper (5) is stored and A discharge resin 10 for recovering the supernatant water to the landing well 1, a sludge support 20 for recovering and storing the settling sludge of the discharge resin 10 and the settling sludge of the settling basin 4, and the vessel Concentration tank 30 for concentrating the sludge of the sludge 20, membrane filter device 40 for filtration and discharge the symbol water of the concentration tank 30, sludge of the concentration tank 30 and the membrane filtration In the water purification system having a dehydrator (50) for dewatering the filtrate filtered by the apparatus (40),
Piping line 100 for taking the symbol water of the discharge resin (10); And
The symbol water of the concentration tank 30 is installed in a pipe for supplying the symbol water of the concentration tank 30 to the membrane filtration device 40, and the symbol water of the discharge resin 10 taken into the pipe line 100. A symbol water mixer 200 which is mixed with water and supplied to the membrane filter device 40;
Effluent water quality improved water purification system by membrane filtration, characterized in that further comprises.
The method of claim 1,
The symbol water mixer 200,
It is provided with a flow control valve 210 in the connection portion with the pipe line 100, characterized in that for mixing the symbol number of the concentration tank 30 and the symbol number of the discharge resin 10 in a predetermined mixing ratio Improved effluent water quality by membrane filtration.

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