KR20220153781A - Apparatus for pretreatment of capacitive deionization - Google Patents

Abstract

The present invention relates to a pretreatment device for a capacitive desalination process. By applying a waste mask to effectively remove particulate matter, organic matter and scaling-inducing substances, the electrode activity in a capacitive desalination process can be optimized and the electrode regeneration cycle can be extended. The pretreatment device of the capacitive desalination process according to the present invention is a pretreatment device of the capacitive desalination process for reducing particulate matter and organic matter, and comprises: an active filtering tank for filtering organic and particulate matter contained in raw water by using an active filtering medium; and a composite reaction tank including an external reactor equipped with an adsorbent and an internal reactor equipped with a waste mask, and removing heavy metals and particulate matter contained in the raw water, which has passed through the active filtering tank, by using the adsorbent and the waste mask. The composite reactor includes an external reactor and an internal reactor having time-series process continuity. The internal reaction tank is provided inside the external reaction tank, and an adsorbent for adsorbing organic pollutants is filled in the external reaction tank. A plurality of waste masks are vertically spaced apart from each other in the internal reaction tank. A treated water discharge pipe for discharging treated water is provided at the inner center of the internal reaction tank. There is a metal cation component derived from yellow dust or fine dust in the waste mask.

Description

Pretreatment device for capacitive desalination process {Apparatus for pretreatment of capacitive deionization}

The present invention relates to a pretreatment device for a capacitive desalination process, and more particularly, in constituting a pretreatment process for a capacitive desalination process, a waste mask containing metal cation components is applied to remove particulate matter, organic substances and substances that cause scaling. It relates to a pretreatment device for a capacitive desalination process that can optimize electrode activity in a capacitive desalination process by effectively removing it and increase the regeneration cycle of an electrode.

Cooling water discharged from various facilities and effluent discharged from basic environmental facilities such as wastewater treatment plants are very stable alternative water resources in terms of water quality and quantity. Cleanly treated cooling water or effluent can serve as dilution water for polluted rivers upstream during the drought period, can be used as high-quality industrial water, and can be supplied as ecological flow to urban rivers that have become dry due to urbanization.

For the reuse of cooling water or effluent, a capacitive desalination process has recently been applied. The capacitive desalination process is a technology that treats raw water by using the ion adsorption and desorption reaction of the electric double layer (EDL) formed on the electrode interface, and has the advantage that it does not consume much energy compared to the reverse osmosis process. . In addition, the capacitive desalination process is in the spotlight as an eco-friendly water treatment process because it is very easy to operate the process and does not discharge environmental pollutants during the desalination process as adsorption and desorption are performed through a change in electrode potential.

On the other hand, the treatment efficiency of the capacitive desalination process is affected by organic matter or particulate matter. If the raw water flowing into the capacitive desalination process contains a lot of organic matter or particulate matter, the efficiency of the capacitive desalination process is reduced. Accordingly, a pretreatment process for removing organic matter and particulate matter is applied before the capacitive desalination process.

As a pretreatment process of the capacitive desalination process, filtration and adsorption processes are applied to remove organic matter and particulate matter. Activated filter media (AFM) or activated carbon is generally used for filtration and adsorption. That is, organic substances and particulate matter contained in raw water are removed through filtration and adsorption of AFM or activated carbon. In general, a method of filling AFM or activated carbon in a column-shaped reactor and passing raw water therethrough is employed.

The pretreatment process of the capacitive desalination process as described above employing AFM or activated carbon has limitations in removing organic matter and particulate matter. As described above, the capacitive desalination process is a method of inducing adsorption and desorption of ions through a change in potential, but the adsorption capacity of the electrode is limited, so when the adsorption capacity of the electrode is saturated, an electrode regeneration process is required. As the cycle of the electrode regeneration process becomes shorter, the amount of treated water and the treatment efficiency inevitably decrease. Therefore, in order to increase the cycle of the electrode regeneration process, it is necessary to minimize the ionic material contained in the raw water through the pretreatment process as much as possible. There are limits to effective removal.

In addition, in the conventional pretreatment process employing AFM or activated carbon, a method of filling a column with AFM or activated carbon is applied, and contaminants are mainly accumulated at the upper end of the column during operation. Column washing is required to remove contaminants, but since contaminants are concentrated only at the upper end of the column, it is difficult to effectively remove contaminants and washing time is long.

Korean Patent Publication No. 2013-61366

The present invention has been made to solve the above problems, and in constituting the pretreatment process of the capacitive desalination process, the capacitive desalination process by effectively removing organic matter and particulate matter by applying a waste mask in which metal cations are collected. The purpose is to provide a pretreatment device for a capacitive desalination process that can increase the regeneration cycle of the electrode while optimizing the activity of the electrode in the

In order to achieve the above object, the pretreatment device of the capacitive desalination process according to the present invention is a pretreatment device for the capacitive desalination process for reducing particulate matter and organic matter, by using an active filter material, organic matter and Active filtering tank for filtering particulate matter; and an external reactor equipped with an adsorbent and an internal reactor equipped with a waste mask, wherein the composite reactor removes heavy metals and particulate matter contained in the raw water that has passed through the active filtration tank using the absorbent and the waste mask. The complex reaction tank includes an external reaction tank and an internal reaction tank having time-series process continuity, an internal reaction tank is provided inside the external reaction tank, and an adsorbent for adsorbing organic pollutants in the external reaction tank is filled, and a plurality of waste masks are vertically spaced apart from each other in the internal reaction tank, and a treated water discharge pipe for discharging treated water is provided at the inner center of the inner reaction tank, and the waste mask is protected from yellow dust or fine dust. It is characterized by the presence of a derived metal cation component.

The active filtering tank includes an upper reaction tank and a lower reaction tank that are selectively combined and separated, and an active filtering material filled in the upper reaction tank and the lower reaction tank, and raw water flows into the upper side of the upper reaction tank and passes through the active filtering material downward. and discharged through the lower side of the lower reactor.

A compressed air inlet and a contaminant outlet are provided at one side of the upper reactor, and when compressed air is injected into the compressed air inlet, the filtered contaminants in the upper reactor are discharged to the outside by the pressure of the compressed air.

The active filter medium is activated filter media (AFM).

The waste mask is a used mask, and the mask has a dust collection efficiency of 80% or more.

Yellow sand or fine dust is present in the waste mask, and a metal cation component is included in the yellow dust or fine dust.

Heavy metals contained in raw water are adsorbed to the waste mask through electrostatic attraction by metal cation components.

Inorganic substances, floating substances, microorganisms, and BOD contained in raw water are reduced by the filter action of the waste mask.

The raw water that has passed through the active filter tank is supplied to the external reaction tank through the raw water inlet provided at the lower end of the external reaction tank, and the raw water flowing into the external reaction tank moves upward, and the absorbent filled in the external reaction tank while the raw water moves upward. In the process of passing through the adsorbent, the organic contaminants contained in the raw water are removed by the adsorbent, and the raw water passing through the adsorbent overflows from the top of the external reactor to the internal reactor.

The raw water overflowed into the internal reaction tank and moved is moved downward in the internal reaction tank, and in the process of moving downward, the raw water sequentially passes through the waste masks arranged in multiple stages in the vertical direction in the internal reaction tank, and the process of passing through the waste masks Heavy metals contained in the raw water are adsorbed to the waste mask by electrostatic attraction with metal cations present in the waste mask, and inorganic substances, suspended solids, microorganisms, and BOD contained in the raw water act as a filtration filter of the waste mask. is filtered by the waste mask, and the raw water of the internal reaction tank moves downward and passes through the waste mask sequentially to produce treated water. It is discharged.

The external reactor and the internal reactor are arranged in a concentric circle shape.

The waste mask is sterilized through a process of spraying a chemical for sterilization on the waste mask to perform primary sterilization on the waste mask and irradiating the waste mask with ultraviolet rays to perform secondary sterilization on the waste mask. It became.

The pretreatment device of the capacitive desalination process according to the present invention has the following effects.

In addition to the filtration process using active filter media and the adsorption process using activated carbon, inorganic ionic substances, heavy metals, suspended solids, and E. Therefore, turbidity and total organic carbon (TOC) of raw water can be minimized.

In addition, the active filtering tank can be easily cleaned by allowing the active filtering tank to be separated into an upper reaction tank and a lower reaction tank, and removing contaminants from the upper reaction tank in a combined state.

1 is a block diagram of a pretreatment device for a capacitive desalination process according to an embodiment of the present invention.
2 is a cross-sectional view of a complex reactor.
3a to 3d are SEM/EDS analysis results according to Experimental Example 1;
4a and 4b are turbidity and total organic carbon (TOC) removal characteristics results according to Experimental Example 4;

The present invention proposes a technology related to a pretreatment process of a capacitive desalination process.

As mentioned in 'Technology behind the invention', in order to increase the electrode activity of the capacitive desalination process and increase the electrode regeneration cycle, it is necessary to reduce organic and particulate matter in the raw water flowing into the capacitive desalination process, For this, a pretreatment process is applied.

Organic matter and particulate matter that affect the capacitive desalination process are managed by turbidity and total organic carbon (TOC). should be For reference, the present applicant has suggested that the turbidity and total organic carbon (TOC) of raw water can be managed by replacing them with TDS (total dissolved solids) through Patent Application No. 2018-0158530.

Organic and particulate matter of raw water managed by turbidity and total organic carbon (TOC) include various types of substances, and in particular, inorganic ionic substances and heavy metals may be included in the case of particulate matter. Therefore, if inorganic ionic substances, heavy metals, suspended solids, E. coli, etc. can be additionally removed in addition to substances that can be removed through normal filtration and adsorption, it means that the turbidity and total organic carbon (TOC) of raw water can be further reduced. .

In addition to the filtration and adsorption process, the present invention applies a process that can additionally remove inorganic ionic substances, heavy metals, suspended solids, and E. A technology that can effectively reduce carbon (TOC) is presented, and through this, the effect of improving the electrode activity of the capacitive desalination process and extending the regeneration cycle of the electrode can be expected.

As such, the present invention grafts the waste mask to the pretreatment process of the capacitive desalination process. As a result of collecting the used mask and conducting a removal experiment for heavy metals and pollutants in water (experimental results described later), the present invention Reference), the ability to remove heavy metals and contaminants was confirmed, and based on this, an optimal pretreatment device with a waste mask is proposed.

In this specification, 'waste mask' refers to a used mask, and may mean a collection of discarded items worn by an individual in daily life. 'Mask' is a mask for protecting the human respiratory system from yellow dust and fine dust, and may mean a mask with a dust collection efficiency of 80% or more.

In addition, it is preferable to use a sterilized waste mask in order to remove microorganisms that may exist in the mask for the 'waste mask' of the present invention. While medical supplies used in medical institutions must be disposed of in compliance with the Waste Management Act, masks worn by individuals in daily life are classified as domestic waste and discarded without a separate procedure. The present invention applies waste masks to wastewater treatment processes Bar A sterilized waste mask is used to prevent possible problems caused by microorganisms present in the waste mask.

In the present invention, the waste mask has two functions. One is the filtration function of the waste mask itself, and the other is the heavy metal adsorption capacity by the metal cation component collected in the waste mask.

As the mask must be worn by a person, components harmful to the human body are excluded, and it is manufactured by weaving with fibers harmless to the human body such as pure cotton. Therefore, when EDS component analysis is performed on the mask, the component of the mask appears to be almost 100% carbon (C).

On the other hand, as the waste mask is worn to protect against yellow dust and fine dust, there is a difference in the amount of the used waste mask, but yellow dust and fine dust exist. As yellow dust is soil dust, the composition of yellow sand is similar to that of soil. Therefore, Na, Al, Si, Pb, Cl, K, and Ca components of the soil are detected in the used waste mask. In the case of fine dust, it contains soil components like yellow dust, and is known to contain sulfate (SO ₄ ^2- ), nitrate (NO ₃ ^- ), and carbons in addition to soil (Busan Metropolitan City Health and Environment Research Institute, fine dust Refer to Dust (PM2.5) Component Investigation Report, 193-197, 2012).

As such, metal cation components such as Na, Al, Ca, K, and Pb are present in the waste mask, and the metal cation component of the waste mask can adsorb heavy metals in water through electrostatic attraction.

In addition, as the waste mask forms a woven fiber form to block the inflow of yellow dust and fine dust, the waste mask itself can function as a filter. That is, BOD, suspended matter, and Escherichia coli in water can be reduced by the filtration function of the waste mask.

Hereinafter, a pretreatment device for a capacitive desalination process according to an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1 , a pretreatment apparatus for a capacitive desalination process according to an embodiment of the present invention includes an active filtration tank 10 and a complex reaction tank 20.

The active filtering tank 10 filters organic substances and particulate matter contained in the raw water using the active filtering medium 13 . In addition, the complex reaction tank 20 is composed of an external reaction tank 21 and an internal reaction tank 22, and adsorption by the external reaction tank 21 and heavy metal and particulate matter by the waste mask 24 of the internal reaction tank 22 Provides a mechanism for removing substances.

Specifically, the active filtering tank 10 is composed of a cylindrical reaction tank and an active filtering medium 13 filled in the reaction tank. Raw water flows into the upper part of the reaction tank and passes downward, and as the raw water passes through the active filtering material 13 in the reaction tank, organic substances and particulate matter in the raw water are filtered by the active filtering material 13.

The reaction tank is composed of an upper reaction tank 11 and a lower reaction tank 12 in detail. The upper reaction tank 11 and the lower reaction tank 12 are coupled by a selective detachable method such as a flange, and may be coupled or separated as necessary.

The reason why the reaction tank is composed of a combination of the upper reaction tank 11 and the lower reaction tank 12 and is selectively combined and separated is as follows. When the reaction tank filled with the active filter material 13 is used and the filtration process is performed in a downward flow, the filtered contaminants are concentrated on the upper side of the reaction tank. This is as mentioned in the 'Technology Behind the Invention'. Even though the filtering contaminants are concentrated on the upper side of the reaction tank, if the entire reaction tank is washed, the filtering contaminants are not easily discharged and the washing takes a lot of time. On the other hand, as in the embodiment of the present invention, the reaction tank is composed of a combination of the upper reaction tank 11 and the lower reaction tank 12, and the upper reaction tank 11 and the lower reaction tank 12 are separated during washing, and the filtered contaminants are concentrated. When washing is performed on the upper reaction tank 11, not only can the filtered contaminants be easily discharged, but also the washing time is reduced.

In addition, a compressed air inlet 14 and a contaminant outlet 15 are provided on one side of the upper reaction tank 11 . The compressed air inlet 14 and the contaminant outlet 15 are for discharging filtered contaminants in the upper reaction tank 11, and the upper reaction tank 11 and the lower reaction tank 12 are not separated from the upper reaction tank ( 11) It is provided to remove filtration contaminants from inside. Specifically, when compressed air is injected through the compressed air inlet 14, filtered contaminants in the upper reaction tank 11 can be easily discharged by the pressure of the compressed air.

Through the configuration of the compressed air inlet 14 and the contaminant discharge port 15, the number of times of separation between the upper reaction tank 11 and the lower reaction tank 12 can be minimized and the number of washings of the upper reaction tank 11 can also be reduced.

On the other hand, the active filter medium 13 filled in the upper reaction tank 11 and the lower reaction tank 12 filters organic matter and particulate matter contained in the raw water as described above. In one embodiment, activated filter media (AFM) ) can be used as the active filtering medium (13).

The raw water passing downward through the active filtration tank 10 is supplied to the complex reaction tank 20, and the complex reaction tank 20 performs an adsorption process by activated carbon and a waste mask 24 for the raw water that has passed through the active filtration tank 10. ) Provides a pollutant removal process by.

The composite reactor 20 has the following configuration.

As shown in FIGS. 1 and 2 , the composite reactor 20 has a double reactor structure including an external reactor 21 and an internal reactor 22 . It is a structure in which the internal reaction tank 22 is mounted inside the external reaction tank 21, and in one embodiment, the external reaction tank 21 and the internal reaction tank 22 may be configured in a concentric circle shape. In addition, a treated water discharge pipe 26 for discharging treated water is provided at the inner center of the internal reaction tank 22 .

The treatment process by the external reactor 21 and the treatment process by the internal reactor 22 have continuity and proceed sequentially. The raw water that has passed through the active filtration tank 10 is introduced through the lower side of the external reaction tank 21 and moved upward, and the raw water moved to the upper part of the external reaction tank 21 overflows and is moved to the internal reaction tank 22 . The raw water moved to the internal reaction tank 22 is moved downward, and the raw water moved to the lower part of the internal reaction tank 22 is moved upward through the treated water discharge pipe 26 provided in the center of the internal reaction tank 22 and discharged to the outside. .

The external reaction tank 21 is filled with an adsorbent 23 for adsorbing organic substances and particulate matter, and a plurality of waste masks 24 are vertically spaced apart from each other in the internal reaction tank 22 and arranged in a multi-stage form. As the adsorbent 23 filled in the external reaction tank 21, activated carbon may be used.

The waste mask 24 disposed at a certain distance in the vertical direction from the internal reaction tank 22 targets the raw water moving downward in the internal reaction tank 22, and inorganic substances such as heavy metals and phosphates contained in the raw water and suspended substances. It absorbs and filters microorganisms such as E. coli and reduces BOD of raw water.

There are two main mechanisms by which contaminants are reduced by the waste mask 24 . One is the electrostatic attraction by the metal cation component derived from yellow dust or fine dust in the waste mask 24, and the other is the filter function of the waste mask 24 itself. Heavy metals contained in the raw water are adsorbed to the waste mask 24 through the electrostatic attraction by the metal cation component, and inorganic substances such as phosphate, suspended matter, microorganisms such as Escherichia coli, and BOD contained in the raw water are the waste mask It is reduced by the filtering action of (24).

The waste mask 24 means a used mask, and the mask refers to a mask worn by a person in a respiratory system to protect from yellow dust and fine dust. In one embodiment, the mask means a mask having a dust collection efficiency of 80% or more. For reference, the Ministry of Food and Drug Safety in Korea classifies masks with dust collection efficiency of 80% or more as KF80, dust collection efficiency of 94% or more as KF94, and masks with dust collection efficiency of 99% or more as KF99.

In addition, the waste mask 24 is a used waste mask, and corresponds to a collection of discarded masks worn by individuals in daily life. According to what the individual wears in everyday life, the waste mask 24 contains yellow dust and fine dust components. Yellow dust and fine dust commonly contain soil components, and soil components include metal cation components such as Na, Al, Ca, K, and Pb. As such, the waste mask 24 has metal cation components such as Na, Al, Ca, K, Pb, etc., although the amount varies for each waste mask 24, and these metal cation components attract heavy metals in water by electrostatic attraction. It plays a role in adsorption through action. The existence of metal cation components such as Na, Al, Ca, K, and Pb in the waste mask 24 and the heavy metal adsorption capacity by these metal cation components are supported through the experimental results described later.

In view of the known water treatment technology, in order to remove heavy metals in water, a carrier with metal cations immobilized is prepared and filled in a reaction tank to be used. According to the method using the method, it is not required to prepare a support in which metal cations are immobilized as in the prior art.

On the other hand, masks discarded after being worn by individuals are classified as household waste, unlike medical waste, and are discarded without a separate procedure. It is preferable to sterilize to prevent various problems. To this end, in the present invention, sterilization using chemicals and sterilization through ultraviolet irradiation are sequentially applied to the waste mask. Specifically, the earring string is first removed from the collected waste mask, and then a sterilizing chemical, such as ethanol, is sprayed on the waste mask to perform primary sterilization on the waste mask. Then, secondary sterilization of the waste mask is performed by irradiating ultraviolet rays, for example, UV-C, which are applied to sterilization of medical wastes, for a certain period of time. Next, when the chemicals remaining in the waste mask are volatilized, the sterilization treatment for the waste mask is completed, and the sterilized waste mask is applied to the internal reaction tank 120.

Looking at the operation of the composite reactor 20 having the configuration as described above is as follows.

The raw water passing through the active filtration tank 10 is supplied to the external reaction tank 21 through the raw water inlet 25 provided at the lower end of the external reaction tank 21 . The raw water introduced into the external reaction tank 21 moves upward, and the raw water passes through the adsorbent 23 filled in the external reaction tank 21 while moving upward. In the course of passing through the adsorbent 23 , organic substances and particulate matter contained in the raw water are adsorbed by the adsorbent 23 . The raw water passing through the adsorbent 23 overflows from the upper end of the external reactor 21 to the internal reactor 22 and is moved. For easy overflow to the side of the internal reaction tank 22, the height of the upper end of the internal reaction tank 22 may be designed lower than the height of the upper end of the external reaction tank 21.

The raw water that overflows and moves into the internal reaction tank 22 moves downward in the internal reaction tank 22 . In the process of moving downward, the raw water sequentially passes through the waste masks 24 arranged in multiple stages in the vertical direction in the internal reaction tank 22, and in the process of passing through the waste masks 24, the heavy metals contained in the raw water Metal cations present in the waste mask 24 are adsorbed on the waste mask 24 by electrostatic attraction, and inorganic substances such as phosphate, suspended matter, microorganisms such as Escherichia coli, and BOD contained in the raw water are It is filtered through the waste mask (24) by the filter action of (24).

While raw water in the internal reaction tank 22 moves downward, it sequentially passes through the waste mask 24 to produce treated water. It is discharged upward through the discharge pipe (26).

Through this process, that is, the reaction of the active filtration tank 10 and the complex reaction tank 20, the pretreatment process is completed, and the treated water discharged through the treated water discharge pipe 26 of the complex reaction tank 20 is the capacitive desalination process. supplied with raw water.

Meanwhile, for easy replacement of the waste mask 24, the internal reaction tank 22 may be designed to be detachable. In one embodiment, the internal reaction tank 22 may be configured in the form of a cartridge so as to be selectively detachable from the external reaction tank 21 .

In the above, the pretreatment device of the capacitive desalination process according to an embodiment of the present invention has been described. Hereinafter, the present invention will be described in more detail through experimental examples.

<Experimental Example 1: SEM/EDS analysis before and after using a waste mask>

A waste mask used once by a high school student in Seoul was collected and applied to the experiment as a waste mask, and an unused mask of the same brand was applied to the experiment as a waste mask before use. The waste masks used in the experiment are KF80 and K94 grade masks. SEM and EDS analysis were performed on each of the waste masks before and after use.

Referring to FIGS. 3A to 3D , as a result of EDS analysis, it was confirmed that the composition of the waste mask before use was 100% carbon (C) regardless of the grade. On the other hand, in the case of the waste mask, various components such as Na, Al, Si, Pb, Cl, K, and Ca were detected. The components of the waste mask are also confirmed through SEM photographs. For reference, FIGS. 3A and 3B are SEM/EDS analysis results of unused KF94 and KF80 masks, respectively, and FIGS. 3C and 3D are SEM/EDS analysis results of used KF94 and KF80 masks, respectively.

<Experimental Example 2: Arsenic removal characteristics of waste mask before and after use>

The arsenic removal experiment in water was conducted using the waste mask prepared in Experimental Example 1 and the unused waste mask. After injecting 100mg/L As solution into a 50mL conical tube, 0.03g of the mask before and after use was incised and reacted. The initial pH was 4.17.

As a result of the experiment, as shown in Table 1, it was confirmed that the unused waste masks (KF80 new, KF94 new) had no arsenic adsorption capacity. On the other hand, the waste mask (KF80 used) showed arsenic adsorption capacity of 2.50mg/g and the waste mask (KF80 used) of 20.57mg/g.

The fact that the waste mask before and after use shows the arsenic adsorption characteristics shown in Table 1 has a close relationship with the EDS analysis results of Experimental Example 1. According to the EDS analysis results of Experimental Example 1, it can be confirmed that the unused waste mask is made of only carbon (C), whereas the waste mask contains various components such as Na, Al, Si, Pb, Cl, K, and Ca. You can check. Among them, it is estimated that metal cation components such as Na, Al, Ca, K, and Pb exhibit arsenic adsorption characteristics as shown in Table 1 below by causing an electrostatic attraction with arsenic (As) in water.

Meanwhile, the difference in arsenic adsorption capacity between the waste mask (KF94 used, 2.50mg/g) and the waste mask (KF80 used, 20.57mg/g) is also determined to be related to the presence or absence of metal cation components. In the case of the waste mask (KF94 used), only nitrogen (N) and oxygen (O) exist in addition to carbon (C), whereas in the case of the waste mask (KF80 used), various metal cations such as Na, Al, Ca, K, and Pb exist. It can be confirmed that the components exist, and it is estimated that the difference in arsenic adsorption capacity is caused by the difference in these metal cation components.

<Arsenic adsorption characteristics of waste masks before and after use> Sample ID Intensity Conc.(mg/L) Absorbents (g) Q (mg/g) pH KF94 new 1321.73 98.74 0.0294 0.00 4.172 KF94 used 1257.43 93.92 0.0293 2.50 4.168 KF80 new 1238.25 98.47 0.0247 0.00 4.174 KF80 used 1137.23 84.89 0.0255 20.57 4.175

<Experimental Example 3: Filtration characteristics of waste mask>

A filtration experiment was conducted on the KF80 waste mask, which was confirmed to have the best arsenic adsorption capacity through Experimental Example 2, and the unused KF80 waste mask. The raw water used was the supernatant of the secondary sedimentation tank of the sewage treatment plant, and the analysis items were BOD, suspended solids (SS), and total coliform counts corresponding to the water pollution process test standards. After collecting 2 L of water from the secondary sedimentation tank at the sewage treatment plant, a filtration experiment was conducted using a KF80 waste mask and an unused KF80 waste mask. The cross-sectional area of the mask used is 12.6 cm ² .

As a result of the experiment, when the waste mask was applied in preparation for the unused waste mask, it was confirmed that the removal efficiency was improved with BOD 34.6%, suspended solids (SS) 50%, and total coliforms 93.6% (see Table 2 below).

<Filtration characteristics of waste masks before and after use> Test Items Sample classification result BOD (mg/L) KF80 new 15.9 BOD (mg/L) KF80 used 10.4 Suspended solids (mg/L) KF80 new 2.6 Suspended solids (mg/L) KF80 used 1.3 Total coliforms (pcs/mL) KF80 new 78 Total coliforms (pcs/mL) KF80 used 5

<Experimental Example 4: Turbidity and total organic carbon removal characteristics of the pretreatment device according to the present invention>

Cooling water discharged from industrial facilities was subjected to a reaction for sequentially passing through an active filtration tank and a complex reaction tank for 7 hours.

As a result of the experiment, it can be confirmed that the turbidity of the raw water is maintained at 1 NTU or less during the 7-hour operation, as shown in FIG. 4a. In addition, it can be confirmed that the total organic carbon (TOC) of the raw water is maintained at a low concentration of 2 ppm or less.

10: active filtration tank 11: upper reaction tank
12: lower reaction tank 13: active filter medium
14: compressed air inlet 15: contaminant outlet
20: complex reaction tank 21: external reaction tank
22: internal reaction tank 23: adsorbent
24: waste mask 25: raw water inlet
26: treated water discharge pipe

Claims (12)

In the pretreatment device of the capacitive desalination process for reducing particulate matter and organic matter,
An active filtering tank for filtering organic and particulate matter contained in raw water using an active filtering medium; and
It is composed of an external reaction tank equipped with an adsorbent and an internal reactor equipped with a waste mask, and removes heavy metals and particulate matter contained in the raw water that has passed through the active filtration tank using the adsorbent and the waste mask Complex reaction tank; It is made including,
The complex reactor,
Including an external reactor and an internal reactor having time-series process continuity,
An internal reaction tank is provided inside the external reaction tank,
The external reaction tank is filled with an adsorbent for adsorbing organic contaminants, and a plurality of waste masks are vertically spaced apart from each other in the internal reaction tank,
A treated water discharge pipe for discharging treated water is provided at the inner center of the internal reaction tank,
Pretreatment device of the capacitive desalination process, characterized in that the metal cation component derived from yellow dust or fine dust exists in the waste mask.
The method of claim 1, wherein the active filtering tank comprises an upper reaction tank and a lower reaction tank that are selectively combined and separated, and an active filtering material filled in the upper reaction tank and the lower reaction tank,
The pretreatment device of the capacitive desalination process, characterized in that the raw water flows into the upper side of the upper reaction tank, passes downward through the active filter medium, and is discharged through the lower side of the lower reaction tank.
The method of claim 2, wherein a compressed air inlet and a pollutant outlet are provided on one side of the upper reaction tank,
When compressed air is injected into the compressed air inlet, the pretreatment device of the capacitive desalination process, characterized in that the filtered contaminants in the upper reaction tank are discharged to the outside by the pressure of the compressed air.
[Claim 4] The pretreatment device of the capacitive desalination process according to claim 1, wherein the active filter medium is AFM (activated filter media).
The pretreatment device of the capacitive desalination process according to claim 1, wherein the waste mask is a used mask, and the mask has a dust collection efficiency of 80% or more.
The pretreatment device of the capacitive desalination process according to claim 1, wherein the waste mask contains yellow dust or fine dust, and the yellow dust or fine dust contains a metal cation component.
The pretreatment device of the capacitive desalination process according to claim 1, wherein heavy metals contained in raw water are adsorbed to the waste mask through electrostatic attraction by metal cation components.
The pretreatment device of the capacitive desalination process according to claim 1, wherein inorganic substances, suspended substances, microorganisms, and BOD contained in the raw water are reduced by the filter action of the waste mask.
The method of claim 1, wherein the raw water that has passed through the active filtration tank is supplied to the external reaction tank through a raw water inlet provided at the lower end of the external reaction tank, and the raw water introduced into the external reaction tank moves upward, while the raw water moves upward. It passes through the adsorbent filled in the external reaction tank, and in the process of passing through the adsorbent, organic pollutants contained in the raw water are removed by the adsorbent,
The raw water passing through the adsorbent is a pretreatment device of the capacitive desalination process, characterized in that the raw water flows from the top side of the external reaction tank to the internal reaction tank side and moves.
The method of claim 9, wherein the raw water overflowed and moved to the internal reaction tank is moved downward in the internal reaction tank, and in the process of moving downward, the raw water sequentially passes through waste masks arranged in multiple stages in the vertical direction in the internal reaction tank,
In the process of passing through the waste mask, heavy metals contained in the raw water are adsorbed to the waste mask by electrostatic attraction with metal cations present in the waste mask, and inorganic substances, suspended solids, microorganisms, and BOD contained in the raw water are It is filtered through the waste mask by the filtration filter action of the waste mask,
Capacitive type characterized in that the raw water of the internal reaction tank moves downward and sequentially passes through the waste mask to produce treated water, and the treated water at the bottom of the internal reaction tank is discharged upward through a treated water discharge pipe provided in the inner center of the internal reaction tank. Pretreatment device for desalination process.
[Claim 4] The pretreatment device of the capacitive desalination process according to claim 1, wherein the external reactor and the internal reactor are arranged in a concentric circle.
The method of claim 1, wherein the waste mask,
Characterized in that the sterilization process is performed through the process of spraying sterilizing chemicals on the waste mask to perform the primary sterilization of the waste mask and irradiating the waste mask with ultraviolet rays to proceed with the secondary sterilization of the waste mask A pretreatment device for capacitive desalination process.

Images