KR20050100582A - Recycling system and the method of wastewater - Google Patents

Abstract

The present invention relates to a wastewater recycling system for recycling the wash water of the CRT and monitor, and more particularly, after the particle agglomeration using the HOC component, which is an inorganic coagulant, by pressure flotation and diatomaceous earth filter, activated carbon filter, UV sterilizer, and PEP filter. By treating with a micro filter, PAD and PAA components can be completely removed and recycled to industrial water and pure water, and an inorganic coagulant is used.

According to the invention, the chemical treatment step of adjusting the pH of the raw water through the caustic soda (NaOH), hydrochloric acid (HCL), flocculant (HOC) and flocculate the particles; Pressurized flotation step of generating and contacting the fine bubbles to float floating material; A primary filtration step of filtering contaminants and sludge contained in the wastewater through the diatomaceous earth; A secondary filtration step of filtering contaminants and sludge through activated carbon; A sterilization step of decomposing and removing bacteria and TOC through a UV sterilizer; A third filtration step of removing suspended solids through the spherical silica filter media of the PEP filter; And a fourth filtration step of removing residual fine materials with a MICRO filter.

A chemical treatment unit formed of a pH adjusting tank into which caustic soda (NaOH), hydrochloric acid (HCL) flows, and a reaction tank into which a flocculant (HOC) flows; A pressure injured part formed of a sludge storage tank for removing the sludge separated from the pressure injured tank to generate fine bubbles to float the floating material; A circulation tank / storage tank which forms micro bubbles and regulates flow rate; A conventional first filtration unit for filtering sludge through diatomaceous earth while passing through a filter, a mixing tank, and a coating tank; A second filtration unit for filtering the wastewater controlled through a storage tank with an activated carbon filter; UV sterilizer for sterilization through UV device; A third filtration unit formed of a PEP filter circulating through the media to remove suspended matter and a storage tank for adjusting the flow rate; Provided is a waste water recycling system, characterized in that formed by a combination of a recycled water supply tank for adjusting the flow rate and a fourth filtration unit formed of a MICRO filter for removing residual fines.

Description

Recycling system and the method of wastewater

The present invention relates to a wastewater recycling system for recycling the wash water of the CRT and monitor, and more particularly, after the particle agglomeration using the HOC component, which is an inorganic coagulant, by pressure flotation and diatomaceous earth filter, activated carbon filter, UV sterilizer, and PEP filter. By treating with a micro filter, PAD and PAA components can be completely removed and recycled to industrial water and pure water, and an inorganic coagulant is used.

In general, there are chemical and physical methods for recycling wastewater generated by the cleaning of CRTs and monitors. The chemical method uses chemicals to change the physical or chemical state of contaminants in the wastewater. The physical method is to remove the contaminants or sludge contained in the waste water by introducing the waste water into the housing equipped with the filter.

When the waste water is recycled by the above chemical method, there is a problem of shortening the lifespan of the rear-end filtration system due to the increase of the conductivity (CONDUCTIVITY), the TDS (TOTAL DISSOLVED SOLID), and the residual of the organic coagulant component. When recycling wastewater by the method, not only the polyacrylamide diacetoneacrylamide (PAD) and protactinium (PAA) components of the bond contained in the wastewater are removed but also the residual components of the organic coagulant, which is a post treatment filter and an expensive facility. Problems such as shortening the life of R / SE (REVERSE OSMOSIS) have occurred.

Therefore, the present invention is to propose a wastewater recycling system that removes PAD and PAA components at the same time using the patent registration No. 416656 'apparatus recycling wastewater using diatomaceous earth', which does not affect the post-treatment process at all. do.

It is an object of the present invention to solve such problems in the prior art, by combining the chemical treatment and physical filtration, it is possible to remove the PAD, PAA components contained in the waste water through the inorganic coagulant HOC, thereby discarded Not only does waste not only recycle wastewater, but it also saves energy and protects the environment.

As a means for achieving the above object, the chemical treatment unit to perform the pH and particle aggregation by the input of chemicals, pressurized buoyancy to remove and then remove the contaminants by spraying air and chemicals in water, filtered using diatomaceous earth A first filtration unit for treatment, a second filtration unit for filtration through activated carbon, a UV sterilizer for sterilization with ultraviolet light, a third filtration unit for removing suspended solids through a PEP filter, and a fourth filtration unit for removing residues with a MICRO filter It is an object of the present invention to provide a wastewater recycling system formed by a combination.

In the conventional wastewater recycling method, a chemical treatment step of adjusting the pH of the raw water through the caustic soda (NaOH), hydrochloric acid (HCL), flocculant (HOC) and aggregates the particles; Pressurized flotation step of generating and contacting the fine bubbles to float floating material; A primary filtration step of filtering contaminants and sludge contained in the wastewater through the diatomaceous earth; A secondary filtration step of filtering contaminants and sludge through activated carbon; A sterilization step of decomposing and removing bacteria and TOC through a UV sterilizer; A third filtration step of removing suspended solids through the spherical silica filter media of the PEP filter; It is characterized in that it is recycled through a fourth filtration step of removing residual fines with a MICRO filter.

In a conventional wastewater recycling system, a chemical treatment unit formed of a pH adjusting tank into which caustic soda (NaOH), hydrochloric acid (HCL) flows and a reaction tank and a flocculating tank into which a coagulant (HOC) flows; A pressure injured portion formed of a first and second sludge storage tanks for generating fine bubbles to float floating substances and removing sludge separated from the pressure injured tanks; A circulation tank / storage tank which forms micro bubbles and regulates flow rate; A conventional first filtration unit for filtering sludge through diatomaceous earth while passing through a filter, a mixing tank, and a coating tank; A second filtration unit for filtering the wastewater controlled through a storage tank with an activated carbon filter; UV sterilizer for sterilization through UV device; A third filtration unit formed of a PEP filter circulating through the media to remove suspended matter and a storage tank for adjusting the flow rate; And a fourth filtration unit formed of a recycled water supply tank for adjusting the flow rate and a MICRO filter for removing residual fine materials.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention.

1 is a state diagram showing the whole of the present invention, Figure 2 is a flow chart showing the flow of the present invention, Figure 3 is a graph showing the turbidity of recycled water in the present invention, Figure 4 is a COD of recycled water in the present invention Figure 5, Figure 5 is a graph showing the SS of the recycled water in the present invention,

First, the chemical treatment unit 10 is a chemical tank (11a) (11b) (11c) and pH adjusting unit (12), a reaction tank (13), a coagulation tank in which caustic soda (NaOH), hydrochloric acid (HCL) and a flocculant (HOC) are stored. At this time, the chemical metering pump (1) is formed on each of the chemical tank (11a) (11b) (11c), the pH adjusting tank (12), the reaction tank (13), the agitator (14) on the coagulation tank (14). 2) form.

In addition, the conduits of the chemical tanks 11a and 11b in which caustic soda (NaOH) and hydrochloric acid (HCL) are stored are introduced into the pH adjusting tank 12, and the conduits of the chemical tanks 11c in which the flocculant (HOC) is stored. Inflow to the reactor (13).

The pressurization part 20 includes a pressurized flotation tank 21 in which a speed reducer 3 is formed, a first sludge storage tank 22 in which a level gauge 4 is formed, and a second sludge storage tank connected to the first sludge storage tank 22. And a DAF pump 6 is formed on the pipeline of the pressure flotation tank 21 to generate microbubbles, and on the pipeline between the first and second sludge storage tanks 22 and 22 '. A sludge conveying pump 5a is formed to perform a sludge conveying function.

In the circulation tank 30 / storage tank 30 ', the DAF pump 6 connected to the pressure inlet tank 21 is connected together on the pipe line of the circulation tank 30, and the level gauge 4 is connected to the storage tank 30'. And one of the conduits of the storage tank 30 'is connected to the sludge storage tank 22.

The first filtration unit 40 is improved by utilizing the patent registration No. 416656 'Recycling device for wastewater using diatomaceous earth' devised by the present inventors, diatomaceous earth and water to a plurality of diatomaceous earth filter 41 equipped with a filter A diatomaceous earth mixing tank 42 is formed to mix to form a primary coating solution, and on one side of the diatomaceous earth mixing tank 42, a diatomaceous earth coating tank 43 is formed to mix water with the primary coating solution to form a secondary coating solution. In this case, the filtration pump (7a) is formed on the pipeline connected to each of the diatomaceous earth filter 41, the supply pump (8) is formed on the pipeline connected to the diatomaceous earth mixing tank 42, the pipeline connected to the diatomaceous earth coating tank 43 On the coating pump 9 is formed. In addition, the stirrer 2 and the level gauge 4 are formed on the diatomaceous earth mixing tank 42, and only the level gauge 4 is formed on the diatomaceous earth coating tank 43.

The second filtration unit 50 is formed of a storage tank 51 in which a level gauge 4 is formed and a plurality of activated carbon filters 52, 52 ′, wherein the storage tank 51 and activated carbon filters 52, 52 ′ are formed. The filtration pump (7b) is formed on the pipe connecting the.

The third filtration unit 60 is formed of a PEP filter 61 in which a spherical silica filter media is formed, and a storage tank 62 in which a filtration pump 7c and a level gauge 4 are formed. A UV sterilizer 70 is formed between the 50 and the third filtration unit 60, and the storage tank 62 of the activated carbon filters 52, 52 ′ of the second filtration unit 50 and the third filtration unit 60. The backwash pump 2a is formed between the two.

The fourth filtration unit 80 is formed of a supply tank 81 and a MICRO filter 82 for supplying recycled water, and form a transfer pump 5b between the supply tank 81 and the MICRO filter 82. A transfer pump 5c is also formed between the storage tank 62 and the supply tank 81 of the third filtration unit 60.

Looking at the process of recycling wastewater through the system formed as above,

First, chemical treatment

When the raw water of the wastewater flows into the pH adjusting tank 12 through the water collecting tank A, caustic soda (NaOH) and hydrochloric acid (HCL) of the chemical tanks 11a and 11b are introduced into the pH adjusting tank 12 and stirred. PH 4 ~ 10) to form a PH that requires pollutants.

After adjusting the pH, the raw water is introduced into the reaction tank 13, where a flocculant (HOC) is introduced into the reaction tank 13 to form a fine floc (FLOC) in the raw water.

Here, HOC, an inorganic coagulant, is a milky white liquid containing chitosan methyol as a main component, and can remove organic matter, remove color, and remove other components, and has excellent cohesion and adsorption power.

Raw water passed through the reactor (13) is introduced into the coagulation tank (14) and stirred to promote cohesion of the fine particles, and the promoted particles are grown into large flocs (FOC) for easy flotation.

In the pressure injury step,

The raw water subjected to chemical treatment is introduced into the pressure flotation tank 21. At this time, microbubbles are generated by drawing and sucking water and air with the DAF pump 6 through the pressure flotation method, and the bubbles are generated in the suspended solids. Contact floating to remove the turbidity to 99%, where the suspended matter in contact with the microbubble is first removed by the skimmer (23).

The removed suspended solids or contaminants are transferred to the second sludge storage tank 22 'via the first sludge storage tank 22, and the treated water from which the suspended matter is first removed is introduced into the circulation tank 30 to supply the DAF pump. (6) again to mix and suck the water and air to form a micro-bubble, the treated water is formed in the micro-bubble again flows into the storage tank (30 ') to control the flow rate for filtration.

In the first filtration step through the first filtration unit 40,

The primary filtration is through three processes of diatomaceous earth mixing tank (42) → diatomaceous earth coating tank (43) → diatomaceous earth filter (41), coating → water purification → filtration, and first, diatomaceous earth mixing tank (42) And water are mixed at a mixing ratio of 1.6: 6 to make a primary coating solution, and in the diatomaceous earth coating tank 43, dilute water to the primary coating solution to make a secondary coating solution, and pump the secondary coating solution to the diatomaceous earth filter 41. To form a coating film on the filter formed inside the diatomaceous earth filter (41).

When the secondary coating solution is coated inside the diatomaceous earth filter 41, the treated water of the storage tank 30 ′ flows into each diatomaceous earth filter 41 to remove contaminants, and then the storage tank 51 of the second filtration unit 50. Flows into.

And when the differential pressure occurs to some extent, air is automatically introduced into the backwash, and when the backwash is completed, the coating process is performed again and circulated. At this time, the sludge removed through backwashing is introduced with the sludge from the pressure injured tank 21. It is moved to the sludge reservoir 22 to be removed.

In the second filtration step through the second filtration unit 50,

When the treated water that has undergone the filtration process through the diatomaceous earth is introduced into the storage tank 51, the flow rate for activated carbon filtration is adjusted, and then the activated carbon filters 52 and 52 ′ are introduced to adsorb and remove various organic substances and COD.

The UV sterilizer 70 is formed at the pipe end portion of the activated carbon filters 52 and 52 'to oxidatively decompose bacteria and TOC (Total Organic Carbon) contained in water using ultraviolet wavelengths.

In the third filtration step through the third filtration unit 60,

After the sterilized treatment water is introduced into the storage tank 62 and the flow rate is controlled, the treated water is filtered through the PEP filter 61, in which the treated water is continuously circulated by the spherical silica filter media of the PEP filter 61. To remove the suspended solids, and the treated water removed in the suspended solids is reflowed into the storage tank 62 to adjust the flow rate.

In the fourth filtration step through the fourth filtration unit 80,

After entering the recycle water supply tank 81 through the storage tank 62 of the third filtration unit 60 to adjust the flow rate, and removes the fine material remaining in the water through the cartridge filter MICRO filter 82 It can be used as recycled water.

Looking at the water quality through the existing water quality test for recycling,

Table 1 is an experimental result of the water quality of LG PHILIPS-DISPLAYS Co., Ltd. Gumi Plant 1, and uses only 26% higher conductivity as the ionic content of industrial water. It can be confirmed that there is no problem at all, and it is superior to the chemical treatment water quality of general factory wastewater.

Table 2 shows the results of the water quality test for LG Electronics PDP plant, which showed low turbidity by visual inspection of wastewater, but was actually 20 ~ 33 NTU in turbidity. Injuries resulted in a significant amount of scum. In addition, secondary pollution due to pH adjustment and flocculant addition increased Na + and Cl- ions, but there is no increase factor in pure water manufacturing facilities due to low total ion water.

Table 1 above is an experimental result of the water quality of LG PHILIPS-DISPLAYS Co., Ltd. Changwon Plant 2, and it is not a problem to use it as raw water of industrial water and pure water in terms of water quality data such as turbidity and conductivity. Although it is a little high, it can be understood that it is a matter that can be easily solved by installing after-treatment facilities.

Table 5 shows the water quality after wastewater recycling for LG PHILIPS-DISPLAYS Changwon Plant 2, showing turbidity, COD, and SS for each treatment process.

Through Table 5 and Figures 3 to 5 it can be seen that turbidity, COD, SS is reduced as the process goes through, the overall filtration efficiency is confirmed that 100% removal of turbidity, 68% removal of COD, 99% SS also removed Can be.

In the present invention, the chemical treatment through caustic soda (NaOH), hydrochloric acid (HCL), flocculant (HOC) and physical filtration through the first to fourth filtration units are performed, thereby the PAC and PAA components contained in the wastewater are collected by HOC. This HOC component has no effect on the post-treatment process, which can extend the life of the apparatus and at the same time increase the filtration cleanliness, thereby increasing the recycling efficiency of the wastewater.

1 is a state diagram showing the whole of the present invention

2 is a flow chart illustrating the flow of the present invention.

Figure 3 is a graph showing the turbidity of recycled water in the present invention

Figure 4 is a graph showing the COD of the recycled water in the present invention

Figure 5 is a graph showing the SS of the recycled water in the present invention

<Description of Symbols for Major Parts of Drawings>

10: chemical treatment unit 11a, 11b, 11c: chemical tank 12: pH adjustment tank

13: reactor 14 flocculation tank 20: pressurized part

21: Pressurized part 22,22 ': Sludge storage tank 23: Skimmer

30: circulation tank 30 ': storage tank 40: first filtration unit

41: diatomaceous earth filter 42: diatomaceous earth mixing tank 43: diatomaceous earth coating tank

50: second filter 51: reservoir 52,52 ': activated carbon filter

60: third filtration unit 61: PEP filter 62: storage tank

70: UV sterilizer 80: fourth filtration unit 81: supply tank

82: MICRO filter

Claims (2)

In the conventional wastewater recycling method, a chemical treatment step of adjusting the pH of the raw water through the caustic soda (NaOH), hydrochloric acid (HCL), flocculant (HOC) and aggregates the particles; Pressurized flotation step of generating and contacting the fine bubbles to float floating material; A primary filtration step of filtering contaminants and sludge contained in the wastewater through the diatomaceous earth; A secondary filtration step of filtering contaminants and sludge through activated carbon; A sterilization step of decomposing and removing bacteria and TOC through a UV sterilizer; A third filtration step of removing suspended solids through the spherical silica filter media of the PEP filter; Waste water recycling method characterized in that recycled through a; 4th filtration step of removing residual fines with a MICRO filter. In a conventional wastewater recycling system, a chemical treatment unit formed of a pH adjusting tank into which caustic soda (NaOH), hydrochloric acid (HCL) flows and a reaction tank and a flocculating tank into which a coagulant (HOC) flows; A pressure injured part formed of a sludge storage tank for removing the sludge separated from the pressure injured tank to generate fine bubbles to float the floating material; A circulation tank / storage tank which forms micro bubbles and regulates flow rate; A conventional first filtration unit for filtering sludge through diatomaceous earth while passing through a filter, a mixing tank, and a coating tank; A second filtration unit for filtering the wastewater controlled through a storage tank with an activated carbon filter; UV sterilizer for sterilization through UV device; A third filtration unit formed of a PEP filter circulating through the media to remove suspended matter and a storage tank for adjusting the flow rate; And a fourth filtration unit formed of a recycled water supply tank for adjusting the flow rate and a MICRO filter for removing residual fine materials.