KR101541101B1 - System for reprocessing discharge water of sewage treatment plant - Google Patents

Abstract

The present invention relates to a reprocessing system for effluent discharged from a sewage treatment plant, and more particularly, to a system for re-treating effluent discharged from a sewage treatment plant, which comprises a total amount of total phosphorus (P) and a trace amount of dissolved organic matter which remain in effluent including sewage and wastewater The present invention relates to a reprocessing system for effluent water discharged from a sewage treatment plant in which effluent water can be quickly reused as industrial water.
According to the present invention, it is possible to enhance the efficiency of solid-liquid separation of flocculated sludge, and to improve the recyclability of effluent water of a sewage treatment plant which has enhanced recyclability of industrial waterway.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for reprocessing wastewater,

The present invention relates to a sewage treatment plant re-treatment system for sewage treatment plant effluent, and more particularly to a system for re-treating effluent discharged from a sewage treatment plant, The present invention relates to a reprocessing system for effluent water discharged from a sewage treatment plant in which dissolved organic materials can be quickly removed to a lesser extent and reused as industrial wastewater.

In general, phosphorus (phosphoric acid), which is the main cause of eutrophication and is a limiting factor for algal growth, has been mainly treated by biological treatment methods and chemical treatment methods using coagulants in the total phosphorus treatment apparatus of sewage and wastewater treatment plants.

However, biological processes are difficult to operate, and it is not easy to obtain sustained and stable effluent quality.

Another electrolytic / flocculent phosphorus removal technology is one of the technologies that can take advantage of the chemical removal technology and solve the disadvantages of the chemical precipitation method, but it has problems such as electrode corrosion. The reuse of shell is used for removing exhaust gas, improving agent of acid soil, adsorption of heavy metals, high concentration of phosphorus, etc. However, calcium carbonate, which accounts for most of the oyster shell, has a large amount of sludge generated in water treatment, There is a problem that an appropriate firing process is required due to a problem.

In addition, the crystallization dephosphorization method is one of physico-chemical treatment methods that have been put to practical use among methods of removing phosphorus in sewage, and it is possible to treat ordinary sewage secondary treatment water. However, Other forms of phosphorus (polyphosphoric acid, organophosphorus, suspended solids), such as pH, calcium concentration, water temperature, disturbances in raw water, contact time, performance of the contact material, It should be removed by secondary functions such as filtration.

In the assembly and dismantling method, magnesium is added to sewage to regulate the pH, thereby recovering phosphorus as a crystal of magnesium ammonium phosphate (MAP), but it is not suitable for treating discharged water.

In particular, the biological removal processes of anaerobic and aerobic bacteria, which are widely used, are converted into polyphosphoric acid, which is an intracellular substance of phosphorus microorganisms, and organic materials such as volatile fatty acids and carbon sources must be supplied. It is not economic and difficult to improve the biological phosphorus and nitrogen simultaneous process because it competes with the carbon source organic matter such as methanol which is required for nitrogen removal.

In addition, conventional physical and chemical treatment apparatuses have difficulties in overuse of chemicals and disposal of sludge treatment.

One of the measures for solving the problems of the above-mentioned prior art is disclosed in Korean Patent No. 10, entitled " Filtration and Adsorption Multistage Wastewater Treatment Apparatus for Removing Total Entrainment of Wastewater Treatment Plant Wastewater, " issued Jun. 27, Korean Patent Registration No. 10-0861554 filed on Oct. 2, 2008 (filed as -2007-0063413) (Sep. 26, 2008), in detail in "Filtration / adsorption multi-stage wastewater treatment device for removing total phosphorus from sewage treatment plant effluent water" Lt; / RTI >

FIG. 1A is a view showing the entire construction of a filtration / adsorption multi-stage wastewater treatment apparatus for removing total phosphorus from discharged water in a sewage treatment plant according to the prior art. FIG. 1B is a cross- Fig. 7 is a view showing an adsorption device section. Fig.

Referring to FIGS. 1A and 1B, a filtration and adsorption multistage treatment apparatus for removing total phosphorus from discharged water in a sewage treatment plant according to the prior art is characterized in that the discharged water from a sewage treatment plant is treated through a multistage tank.

More specifically, in the filtration / adsorption multistage treatment apparatus for removing the total phosphorus of the discharged water in the sewage treatment plant according to the prior art, the discharged water is discharged from the secondary sedimentation tank, flows into the flow rate control unit 10, And is supplied to the pre-filtration unit 20 constituted of filter media. If the residence time is to be adjusted according to the flow rate, the suspended substance and the total phosphorus of the introduced effluent, the flow rate regulator 10 is required. The inflow water flows into the lower end of the pre-filtration unit 20, passes through the lower end and upper end of the pre-filtration unit 20, and then flows into the filtration and absorption unit 30. Here, the filtration and adsorption apparatuses for treating the effluent of the sewage treatment plant are composed of two stages of filter media inside the apparatus. The front filtration unit 20 is filtered by a polyurethane based synthetic resin filter medium and the filtration and absorption unit 30 at the downstream is operated in an upward flow by using an adsorbent having a particle size of about 0.7 mm. In addition, when used as a tertiary treatment of a sewage treatment plant, it flows into the disinfecting tank 50 to disinfect pathogenic bacteria such as Escherichia coli.

As described above, in the filtration / adsorption multi-stage wastewater treatment apparatus for removing the total phosphorus of the discharged water of the sewage treatment plant according to the prior art, it is possible to perform the suspension filtration of the discharged water through the two-stage filtration treatment apparatus.

However, in the filtration and adsorption multi-stage wastewater treatment apparatus for removing the total amount of the discharged water from the sewage treatment plant according to the above-described prior art shown in Figs. 1A and 1B, the total phosphorus is considerably removed through the filter material installed in two stages, The amount of total phosphorus is about 1 mg / L, and the time required for the removal of the phosphorus is considerably long.

FIG. 1C is a view showing a result of removing the total phosphorus from an experimental apparatus for filtration treatment of a filtration / adsorption multi-stage wastewater treatment apparatus for removing total phosphorus from discharged water in a sewage treatment plant according to the prior art.

Referring to FIG. 1C, in the prior art, the concentration of total phosphorus in the incoming effluent is maintained at approximately 2.7 to 4.2 mg / L (approximately 3 mg / L) for approximately 30 days and the amount of residual phosphorus after total phosphorus removal is approximately 0.8 To 1.2 mg / L (approximately 1 mg / L on average).

The effluent having a total phosphorus of about 1 mg / L is sufficient for reuse, for example in industrial water, but it takes about 30 days to maintain a total phosphorus of about 1 mg / L, It is achieved after about 40 days in order to maintain a total phosphorus of about 0.3 mg / L.

As described above, in the prior art, since the time required to remove the total phosphorus by a very small amount (approximately 1 mg / L on average) is very long, the amount of the phosphorus adsorbent to be used increases considerably, Ultimately, there is a problem that there is no economical efficiency.

Also, according to the Enforcement Regulations of the Sewer Law of the Republic of Korea, which was revised and promulgated on February 26, 2010, water quality standards for total water in discharged water have been drastically increased from 2 mg / L to 0.2 mg / L in 2012 to improve river water quality. Accordingly, there arises a problem that the conventional technology does not satisfy the new water quality standard of the total person in the discharged water.

Therefore, not only the total phosphorus and dissolved organic substances in the discharged water can be quickly removed to a trace amount or less, for example, it can be reused as industrial water, and it is also maintained as a new water quality standard of TP of 0.2 mg / L or less A new approach is required.

Korean Patent Registration No. 10-1026734 (Mar. 23, 2011) "Process Apparatus and Method for Reusing Waste Water" has been disclosed as a conventional technique for solving such a problem.

However, in the case of the registered patent according to the above-mentioned prior art, in the case of reusable water, there is no pathogenic bacterium according to the use place and there is no undegraded pest. However, such a treatment is insufficient to improve the recyclability of the industrial water channel There was a need to increase it further.

Korean Patent Registration No. 10-0861554 (Sep. 26, 2008) "Filtration and adsorption multi-stage wastewater treatment device for removing total phosphorus from sewage treatment plant effluent water" Korean Patent Registration No. 10-1026734 (Mar. 28, 2011) "Treatment Apparatus and Method for Reuse of Effluent Water"

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems in the prior art, and it is an object of the present invention to provide a sludge sewage treatment plant which can increase the efficiency of solid-liquid separation of flocculated sludge and remove pathogens and undissolved harmful substances, There is a main purpose in providing a reprocessing system for effluent water.

As a means for achieving the above object, the present invention provides a reprocessing system for sewage treatment plant effluent water, comprising: A flocculation reaction tank into which effluent water is introduced, a flocculant is injected therein, and flocculation reaction treatment is performed with the effluent water; A neutralization tank in which the flocculation reaction treated flocculation reaction water is introduced and a neutralization agent is injected to perform a neutralization reaction treatment; A flocculation tank into which the neutralization-treated neutralized water flows and into which a coagulation aid flows to form a floc; A sedimentation tank through which the flocculated sludge is transferred from the flocculation sludge tank, the flocculation sludge in the fl uid forming water is separated and discharged, and the treated sludge is removed; An ozone contact tank that removes a small amount of total phosphorus and dissolved organic matter remaining in the treated water into which ozone is injected to treat odor, color, turbidity, heavy metals, and E. coli to generate reused water; And a nano bubble generating unit that is connected to the flocculation tank, the neutralization tank, the flocculation tank, and the ozone contact tank and generates nano bubbles respectively in the flocculation tank, the neutralization tank, Generating device; A flocculant reservoir for storing the flocculant; A first metering pump for introducing the flocculant into the flocculation tank from the flocculant reservoir; A neutralizer reservoir for storing the neutralizer; A second metering pump for introducing the neutralizing agent from the neutralizing agent storage tank into the neutralization tank; A flocculation assistant reservoir for storing the flocculant aid; And a third metering pump for introducing the coagulation aid from the coagulation aid reservoir into the bath; A first agitator for mixing the effluent and the flocculant in the flocculation tank; A second agitator for mixing the flocculated effluent and the neutralizing agent in the neutralization tank; And a third agitator for mixing said neutralization water and said flocculation aid in said flocking tank; Wherein the treatment water discharged through the discharge end of the ozone contact tank is stored in a reused water storage tank and a reprocessing unit is additionally provided at a discharge end of the reused water storage tank, A second processor connected to the first processor, and a discharge guide connected to the second processor; Wherein the first processor is formed in a cylindrical shape and has an interior hollow, the one end surface being in contact with the discharge end; An inserting end of the second processor is inserted into the other end face of the first processor at a certain depth; An O-ring is interposed between the outer circumferential surface of the insertion end and the other end surface of the first processor through which the insertion end passes, and is configured to closely seal; A plurality of pairs of positive and negative electrodes are arranged inside the first processor at intervals from the discharge end connection portion; Wherein both the positive electrode and the negative electrode are formed in a disc shape; A plurality of positive electrode water holes and negative electrode water holes are formed on each of the plate surfaces for the flow of the reused water; Wherein the negative electrode further comprises a plurality of needles protruding toward the positive electrode; Wherein the positive electrode and the negative electrode are electrically connected to a power supply to receive a voltage required for discharging, respectively; The tapered surface is formed at an inserting end of the second processor; The first processor as well as the second processor are all constructed of an insulator; A semicircular ground electrode is embedded in the inner circumferential surface of the second processor at intervals; A dielectric is attached to the surface of the ground electrode, that is, the surface disposed inside the second processor; A slidable discharge electrode is inserted into the dielectric; The discharge electrode having a conical shape; A flange sliding along a slot formed in the dielectric is formed at one end of the discharge electrode; A plurality of electrode through holes are formed in the flange at intervals in a circumferential direction; The body of the discharge electrode 660 has a diameter smaller than that of the flange F, a spring is fitted to the tip of the discharge electrode 660, and the discharge electrode 660 is always pushed toward the insertion end side. Wherein the ground electrode and the discharge electrode are connected to the power supply, respectively.

According to the present invention, the efficiency of solid-liquid separation of flocculated sludge is increased to remove pathogens and undissolved harmful substances, thereby improving the recyclability of effluent water in the sewage treatment plant, which increases the recyclability of the industrial waterway.

FIG. 1A is a view showing an overall configuration of a filtration / adsorption multi-stage wastewater treatment apparatus for removing total phosphorus from discharged water of a sewage treatment plant according to the prior art.
1B is a view showing a pre-filtration unit and a filtration and absorption unit of a filtration apparatus according to the prior art.
FIG. 1C is a view showing a result of removing the total phosphorus from an experimental apparatus for filtration treatment of a filtration / adsorption multi-stage wastewater treatment apparatus for removing total phosphorus from discharged water in a sewage treatment plant according to the prior art.
2 is a schematic view of a processing apparatus for reusing discharged water according to an embodiment of the present invention.
FIG. 3 is a graph showing data showing the results of the gun removal test using the processing apparatus for reusing the discharged water according to the present invention shown in FIG.
Figure 4 shows a further embodiment according to the invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

The present invention uses the above-described prior-art patent No. 1026734 as it is. Therefore, the features of the device configuration described below are all described in Patent Registration No. 1026734.

However, the present invention is characterized in that the additional embodiment portion in which the specific configuration is partially improved in order to achieve the object of the configuration disclosed in the above-mentioned Japanese Patent No. 1026734 is the most essential configuration feature.

Therefore, the device configuration, characteristics and operation relationship described below will be referred to as the contents of the above-mentioned Japanese Patent No. 1026734, and the configuration related to the main features of the present invention will be described in detail at the rear end.

Referring to FIG. 2, a treatment apparatus 200 for reusing effluent water according to an embodiment of the present invention includes a flocculation reaction tank 40 into which effluent water is introduced, in which a flocculant is injected and flocculation reaction treatment is performed with the effluent water; A neutralization tank 41 into which the coagulation reaction-treated flocculation reaction water is introduced, a neutralization agent is injected and neutralization reaction is performed; A flocculation tank 42 into which the neutralization-treated neutralized water is introduced and into which a coagulation aid flows to form a flock; A sedimentation tank 60 for discharging the treated water from which the flocculated sludge is transferred from the flocculation tank 42, the flocculated sludge in the fl uid forming water is separated from the flocculated sludge by liquid-liquid separation, and the coagulated sludge is removed; An ozone contact tank 70 for removing trace amounts of total phosphorus and dissolved organic substances remaining in the treated water after ozone is introduced and treating odors, color, turbidity, heavy metals, and coliform bacteria to produce reused water; And an ozone contact tank 70 connected to the flocculation tank 40, the neutralization tank 41, the flocculation tank 42 and the ozone contact tank 70. The flocculation tank 40, the neutralization tank 41, And a nano bubble generator 50 for generating nano bubbles in the ozone contact tank 70, respectively.

In addition, the treatment apparatus 200 for reusing effluent according to an embodiment of the present invention includes a flocculant reservoir 30 for storing the flocculant; A first metering pump (31) for introducing the coagulant from the coagulant reservoir (30) into the coagulation bath (40); A neutralizer reservoir (32) for storing the neutralizer; A second metering pump 33 for introducing the neutralizing agent from the neutralizing agent storage tank 32 into the neutralization tank 41; A flocculation aid storage tank (34) for storing the flocculation aid; And a third metering pump 35 for introducing the coagulation assistant from the coagulation assistant reservoir 34 into the flocking tank 42.

In addition, the treatment apparatus 200 for reusing effluent water according to an embodiment of the present invention includes a first agitator 21 for mixing the effluent and the flocculant in the flocculation tank 40; A second agitator (22) for mixing the neutralization agent with the flocculation reaction water in the neutralization tank (41); And a third agitator (23) for mixing and reacting the neutralization water and the coagulation assistant in the flocking tank (42).

The processing device 200 for reusing effluent water according to an embodiment of the present invention may further include the first to third metering pumps 31, 33 and 35, the nano bubble generator 50, And may further include a controller (controller) 20 for controlling the operation of the device 71. Here, the control device 20 may be implemented as a microprocessor or a programmable logic circuit (PLC) or the like.

Hereinafter, the specific configuration and operation of the processing apparatus 200 for reusing the discharged water according to an embodiment of the present invention will be described in detail.

Referring back to FIG. 2, first, effluent water that is biologically treated and discharged at a sewage and wastewater treatment plant flows into the storage tank 10. Thereafter, the effluent water flows into the coagulation bath 40 constantly in accordance with the current signal of the flow meter (not shown) of the inflow pump 11. At this time, the flocculant is introduced into the flocculation tank (40) by the first metering pump (31) from the flocculant storage tank (30) storing the flocculant such as iron chloride. The first metering pump 31 automatically injects the flocculant into the flocculation tank 40 in proportion to the flow rate and concentration of the influent water. In the flocculation tank (40), the effluent and the flocculant are mixed by the first stirrer (21) to cause flocculation reaction.

Thereafter, the coagulation reaction water in the coagulation reaction tank (40) is introduced into the neutralization tank (41). At this time, the neutralizing agent is introduced into the neutralization tank 41 by the second metering pump 33 from the neutralizing agent storage tank 32 for storing the neutralizing agent for adjusting the pH and the sedimentation efficiency. The second dosing pump 33 is operated in accordance with the flow rate and concentration of the flocculation reaction water which is the flocculation-treated water through the PH measurement control device (PHIC) and the redox electrode device (ORP) The neutralizing agent is automatically injected into the neutralization tank 41 in a proportional control manner. In the neutralization tank (41), the flocculation reaction water and the neutralizing agent are mixed by the second agitator (22) to perform the neutralization reaction, and the pH of the flocculation reaction water is adjusted.

Thereafter, neutralized water neutralized in the neutralization tank 41 flows into the flask forming tank 42. At this time, in order to increase the flocculation effect of the neutralized compound to increase the sedimentation effect, a coagulation assistant storage tank 34 for storing an aggregation aid such as a polymer flocculant is provided in the flocculation tank 42). The third dosing pump 35 automatically injects the coagulation assistant into the flocking tank 42 proportionally in proportion to the flow rate and concentration of the neutralized water, which is neutralized reacted water. In the flask forming tank 42, the neutralized water and the coagulation assistant are mixed by the third agitator 23 to form a flock.

In the present invention, when the effluent water is treated in the flocculation tank 40, the neutralization tank 41 and the flocculation tank 42, the flocculation tank 40, the neutralization tank 41, 42 are connected to each other to generate nano bubbles. The nano bubbles generated in the nano bubble generator 50 are subjected to the coagulation reaction process in the coagulation reaction tank 40, the neutralization reaction process in the neutralization tank 41, (TP) and trace amounts of dissolved organic matter during formation. Thereafter, the flocculated water flowing in the flocculation tank 42 is sent to the settling tank 60, and in the settling tank 60, the flocculated sludge is liquid-liquid separated by the sludge transfer pump 61 connected to the settling tank 60 And then discharged to a sludge concentration treatment apparatus (not shown).

Thereafter, the treated water from which the aggregated sludge has been removed in the sedimentation tank (60) flows into the ozone contact tank (70). At this time, the nano bubbles generated in the nano bubble generator 50 and the ozone generated in the ozone generator 71 are put into the ozone contact tank 70 together.

The nano bubbles introduced into the ozone contact tank 70 and the minute amounts of total phosphorus and dissolved organic matter remaining in the treated water which is equal to the ozone are removed and the reusing water generated by treating the odor, And flows into the water storage tank 72.

The mechanism according to odor, color, turbidity, heavy metal and coliform treatment in the ozone contact tank 70 is as follows.

- Deodorizing

The odor of the discharged water is odorous due to the mercaptan compound of the hydrocarbon and the sulfur component, and can be treated with dissolved ozone at 2 to 6 mg / L. The reaction formula is as follows.

_{nCxHySz + O 3 -> nCO 2} + nzSO 2 + nyH 2 O

- Color processing

The chromaticity of the effluent water is chromatic due to a very small amount of organic hydrocarbon double bonds, and it can be treated with dissolved ozone at 2 to 4 mg / L. The reaction formula is as follows.

_{(CxHy = CxHy) + O 3} -> nCO 2 + mH 2 O

- turbidity treatment

Turbidity of effluent water is evidenced by trace organic or inorganic hydrocarbons, wash outs of microorganisms, colloid particles and chromaticity, by the combination of chemical oxidation of free radicals such as OH ^- by dissolved ozone and neutralization of charge And the colloidal particles are enhanced in transparency by neutralizing the negatively charged particles by ozone.

- heavy metal treatment

Trace amounts of heavy metal ions in the effluent may be present in an insoluble form. Iron ions in the Fe ²⁺ state form Fe (OH) ₃ ions in the form of flocculent in the water and become pinkish. The reaction formula is as follows.

Fe ²⁺ + O ₃ + H ₂ O -> Fe ³⁺ + O ₂ + 2OH ^-

Fe ³⁺ + 3H ₂ O -> Fe (OH) ₃ + 3H ⁺

In addition, the soluble salts of manganese are oxidized to manganese dioxide (MnO ₂ ), which is insoluble in water. The reaction formula is as follows.

Mn ²⁺ + O ₃ + H ₂ O -> Mn ⁴⁺ + O ₂ + 2OH ^-

Mn ⁴⁺ + 4H ₂ 0 -> Mn (OH) ₄ + MnO ₂ + 2H ₂ O

- Escherichia coli treatment

E. coli treatment (or sterilization mechanism) is to oxidize organic molecules of the E. coli organism using ozone. More specifically, free radicals such as OH ^{- of} ozone oxidize sulfuric acid in coliform plasmids and chemically decompose the double bond of fatty acids in the cell wall and plasma membrane to ultimately degrade and sterilize the protoplasts.

As described above, in the ozone contact tank 70, a small amount of total phosphorus and dissolved organic matter remaining in the effluent water due to the nano bubbles and ozone is removed, and the odor, chromaticity, turbidity, heavy metals, , Reused water) is transferred into the reused water storage tank 72 and temporarily stored. Thereafter, the reused water is reused by, for example, industrial water depending on the application by the transfer pump 73 connected to the reused water storage tank 72.

The operations of the above-described inflow pump 11, the first to third metering pumps 31, 33 and 35, the nano bubble generator 50 and the ozone generator 71 are controlled by the controller 20 . In this case, the control device 20 automatically controls the first to third dosing pumps 31, 33, 35 in proportional control mode in which the flow rate and the concentration of the discharged water in the existing sewage and wastewater treatment plants are injected proportionally, The neutralizing agent and the coagulation assistant can be automatically injected into the flocculation tank 40, the neutralization tank 41, and the flocculation tank 42, respectively.

In the treatment apparatus 200 for reusing effluent water according to the present invention, the nano bubbles generated by the nano bubble generator 50 are supplied to the flocculation tank 40, the neutralization tank 41, Turbidity and chromaticity remaining in the treated water together with the ozone in the ozone contact tank 70 in the treatment of the total phosphorus and trace organic matter of the discharged water in the ozone contact tank 42 And it is used to increase the efficiency of the reaction by reducing the injection amount of ozone.

The nano bubbles generated by the nano bubble generator 50 are generated by physical stimulation (compression, expansion, vortex, etc.) caused by the flow of water, which occurs during the process of rapidly adiabatically compressing and expanding the air in the air The reaction takes place under extreme reaction of ultra-high pressure and ultra-high temperature. Nano bubbles generated by the extreme reaction of ultrahigh pressure and ultrahigh temperature decompose water molecules to form free radicals such as OH ^- . Since free radicals have very strong oxidizing ability, it is possible to decompose harmful organic substances and inorganic substances which are difficult to decompose, and thus it is possible to increase the efficiency of oxidation reaction. Such a nano bubble generator 50 is applied, for example, in Korean Patent No. 10-2008-0047863 entitled " Method and apparatus for treating wastewater using nano bubbles "issued May 23, 2008 (Hereinafter referred to as " 352 patent ") published on Dec. 2, 2008, the disclosure of which is incorporated herein by reference in its entirety.

The nano bubbles generated in the above-described 352 patented nano bubble generator have a diameter of 0.1 to 1 탆 (i.e., 100 to 1,000 nm). However, the inventors of the present invention have confirmed that it is preferable to increase the diameter of nano-bubbles and shorten the life of the nano-bubbles and to produce nano-bubbles having small diameters. Therefore, the nano bubbles generated in the nano bubble generator 50 according to the present invention are controlled to have a diameter in the range of approximately 100 to 200 nm. The nano bubbles having a diameter of about 100 to 200 nm have been found to stably exist in the effluent for a relatively long period of time, thereby enhancing the flocculating effect while reacting with phosphoric acid and phosphorus compounds, harmful organic matters and inorganic matters. When the diameter of the nano bubbles is reduced, ions that have been enriched at the time of nano bubbles are wrapped around the nano bubbles to prevent scattering of gases in the nano bubbles, thereby contributing to the stabilization of the nano bubbles (that is, . When the lifetime of nanobubbles is extended (that is, when the diameter of nanobubbles is reduced), the number of nanobubbles increases with respect to the same volume, and the surface area of the total nanobubbles and contaminated sewage and wastewater increases, . As a result, the pressurization of the gas gas (air or air and contaminated organic substances in the gaseous state) in the nano-bubbles continues for a longer time to dissolve gaseous and liquid organic pollutants, It is possible to achieve high efficiency also in the process process such as cultivation of microorganisms in the process of wastewater treatment. Therefore, in the present invention, by using the surface adhesion effect of the nano bubbles, the foam separation (forming nano bubbles and organic matters to form a scum shape) reduces phosphoric acid and phosphorus compounds and dissolved organic substances in the effluent to a very small amount Lt; / RTI >

FIG. 3 is a graph showing data showing the result of the total phosphorus removal test using the treatment device for reusing the effluent water according to the present invention.

Referring to FIG. 3, inflow water (i.e., effluent from existing sewage and wastewater treatment plants) is inflowed for 7 days from September 2, 2010 to September 8, 2010, and is discharged from 10:00 am to 5:00 pm on a regular basis (The discharged water discharged from the settling tank 60 shown in FIG. 2) and the final treated water (the discharged water discharged from the ozone contact tank 70 shown in FIG. 2 (that is, the reused water) (TP) of the total phosphorus (TP) in the sample.

As can be seen in Figure 3, the total amount of influent water was 2.35 mg / L on average. The total amount of total phosphorus in the intermediate treatment water measured 8 times daily was maintained at 0.3 mg / L or less with an average of 0.22 1 mg / L (mean minimum 0.14 mg / L and average maximum 0.35 mg / L) The amounts were maintained at less than 0.2 mg / L with an average of 0.11 mg / L (mean minimum 0.04 mg / L and mean maximum 0.19 mg / L). In addition, the total amount of total phosphorus in the intermediate treatment water did not exceed 0.4 mg / L and the maximum amount of total phosphorus in the final treatment water did not exceed 0.2 mg / L.

As described above, in the present invention, the residual amount of total phosphorus was maintained at a maximum of 0.4 mg / L or less while maintaining an average of 0.22 mg / L for the intermediate treated water within about 1 to 2 hours after the inflow of the influent water, Maintaining a maximum of 0.2 mg / L or less, while maintaining an average of 0.11 mg / L, quickly removes total phosphorus in a much shorter time than in the prior art, resulting in a significant reduction in the use of flocculants, neutralizers, and flocculants. Accordingly, the cost for removing the gun is greatly reduced, so that the present invention can be sufficiently economical.

Further, in the present invention, an advantage that the total amount of the final treated water (that is, the reused water) has a significantly lower value than that of the prior art, so that the total removal can be made very efficiently.

As described above, the nano bubbles generated by the nano bubble generator 50 according to the present invention increase the oxidation reaction and surface area of OH ^- , quickly react the reaction time of the organic pollutant, the coagulating agent and the ozone in a short time, The phosphorus and phosphorus compounds in the effluent water and a small amount of soluble organic matter are treated and the nano bubbles and a small amount of ozone are put into the ozone contact tank 70 at the subsequent stage together as described above to adjust the chromaticity, The amount of total phosphorus can be reduced to a value of about 0.2 mg / L or less such that final discharge water can be reused as industrial water or the like.

In addition, a further embodiment according to the present invention includes a reprocessing unit (PLA) further provided in the discharge end (DR) of the reused water reservoir (72), as shown in Fig.

4, the reprocessing unit PLA includes a first processor 500 connected to the discharge end DR, a second processor 600 connected to the first processor 500, And a discharge guide 700 connected to the second processor 600.

At this time, the first processor 500 is formed in a cylindrical shape and has a hollow interior, and the discharge end DR contacts the one end face.

The insertion end 610 of the second processor 600 is inserted into the other end surface of the first processor 500 to a certain depth.

The reason that the insertion end 610 is exposed to the inside of the first processor 500 without being assembled with the other end surface of the first processor 500 as shown in the illustrated example is that the reuse water The length of the insertion end 610 does not flow immediately but flows after the length of the insertion end 610, so that the residence time can be made longer. Therefore, the present invention is intentionally designed to increase the treatment efficiency.

In addition, an O-ring 630 is interposed between the outer circumferential surface of the insertion end 610 and the other end surface of the first processor 500 through which the insertion end 610 passes, thereby sealingly sealing.

In addition, a pair of positive and negative electrodes 510 and 520 are arranged in the first processor 500 at intervals from the discharge end (DR) connection part.

At this time, both the positive electrode 510 and the negative electrode 520 are formed in the form of a disk. On each of the plate surfaces, a plurality of positive electrode passage holes 514 and negative electrode passage holes 524 are formed for the flow of the reused water. The negative electrode (520) is provided with a plurality of needles (522) protruding toward the positive electrode (510).

In this case, the saliva 522 is formed so as to concentrate charges while reducing the gap with the positive electrode 510, thereby enhancing the discharge efficiency.

The positive electrode 510 and the negative electrode 520 are electrically connected to the power supply 530 to receive a voltage required for discharging.

The tapered surface 612 is formed at the insertion end 610 of the second processor 600. The tapered surface 612 is formed at the tip of the inlet hole 620 formed in the insertion end 610 And is formed so as to be inclined in the longitudinal direction of the inlet hole 620, so that the treated water subjected to the first plasma treatment by discharge can flow more easily and quickly.

In addition, the shape of the enclosure constituting the outside of the first processor 500 as well as the second processor 600 is all made of an insulator, and on the inner circumferential surface of the second processor 600, An electrode 640 is embedded and a dielectric 650 is attached to the surface of the ground electrode 640, that is, the surface disposed inside the second processor 600.

At this time, the dielectric 650 is formed in a shape corresponding to the ground electrode 640, and the discharge electrode 660 slidable along the dielectric 650 is inserted into the dielectric 650.

The discharge electrode 660 has a substantially conical shape and a flange F is formed at one end to slide along a slot (not shown) formed in the dielectric 650. The flange F has a gap in the circumferential direction And a plurality of electrode through holes 662 are formed to guide the process water to flow.

Particularly, the body of the discharge electrode 660 has a diameter smaller than that of the flange F, and a spring 670 is fitted to the tip of the discharge electrode 660 so as to be always pushed toward the insertion end 610 side.

The ground electrode 640 and the discharge electrode 660 are connected to the power supply 530, respectively.

Thus, when the reused water flows into the first processor 500 through the discharge end DR for the reprocessing of the reused water, a plasma due to the discharge is formed in the inside, and a large number of radicals generated at this time are re- And the first decomposition and removal is performed.

In this way, the treated reused water, that is, the treated water, enters the second processor 600, and the discharge electrode 660 is pushed to the opposite side by squeezing the spring 670 by the water pressure generated at this time.

As described above, the discharge electrode 660 generates a plasma while generating a discharge when it reaches a constant voltage condition while reciprocating according to a hydraulic pressure variation, that is, a treated water.

In this case, since the electric capacity to reach the discharge is determined by the dielectric 650, it is possible to control the degree of processing by adjusting it.

When this process is performed, the harmful component is hardly left in the treated water by the secondary treatment, and the treated water that has been treated is discharged on the discharge guide 700 and returned to the utilization site.

10: Storage tank 11: Inflow pump
20: automatic control unit 21, 22, 23:
30: coagulant storage tank 31, 33, 35: metering pump
32: Neutralization agent storage tank 34: Storage tank for coagulation aid
40: flocculation tank 41: neutralization tank
42: Flux forming tank 50: Nano bubble generating device
60: sedimentation tank 61: sludge transfer pump
70: ozone contact tank 71: ozone generator
72: Reused water storage tank 73: Feed pump

Claims (1)

A flocculation reaction tank into which effluent water is introduced, a flocculant is injected therein, and flocculation reaction treatment is performed with the effluent water; A neutralization tank in which the flocculation reaction treated flocculation reaction water is introduced and a neutralization agent is injected to perform a neutralization reaction treatment; A flocculation tank into which the neutralization-treated neutralized water flows and into which a coagulation aid flows to form a floc; A sedimentation tank through which the flocculated sludge is transferred from the flocculation sludge tank, the flocculation sludge in the fl uid forming water is separated and discharged, and the treated sludge is removed; An ozone contact tank that removes a small amount of total phosphorus and dissolved organic matter remaining in the treated water into which ozone is injected to treat odor, color, turbidity, heavy metals, and E. coli to generate reused water; And a nano bubble generating unit that is connected to the flocculation tank, the neutralization tank, the flocculation tank, and the ozone contact tank and generates nano bubbles respectively in the flocculation tank, the neutralization tank, Generating device; A flocculant reservoir for storing the flocculant; A first metering pump for introducing the flocculant into the flocculation tank from the flocculant reservoir; A neutralizer reservoir for storing the neutralizer; A second metering pump for introducing the neutralizing agent from the neutralizing agent storage tank into the neutralization tank; A flocculation assistant reservoir for storing the flocculant aid; And a third metering pump for introducing the coagulation aid from the coagulation aid reservoir into the bath; A first agitator for mixing the effluent and the flocculant in the flocculation tank; A second agitator for mixing the flocculated effluent and the neutralizing agent in the neutralization tank; And a third agitator for mixing the neutralization water and the coagulation assistant in the flocking tank, the system comprising:
The treatment water discharged through the discharge end of the ozone contact tank is further stored in the reused water storage tank and connected to the discharge end of the reused water storage tank,
The reprocessing unit includes a first processor 500 connected to a discharge end DR of the reusing water storage tank, a second processor 600 connected to the first processor, and a discharge guide connected to the second processor 600 700); The first processor 500 is formed in a cylindrical shape and has an internal hollow state, and the discharge end is in contact with one end face; The insertion end 610 of the second processor 600 is inserted into the other end surface of the first processor at a certain depth; An O-ring (630) is interposed between the outer peripheral surface of the insertion end and the other end surface of the first processor through which the insertion end passes, and is configured to closely seal;
In the first processor 500, a pair of positive electrodes 510 and negative electrodes 520 are arranged at a distance from the discharge end connection portion;
Wherein both the positive electrode and the negative electrode are formed in a disc shape; A plurality of positive electrode water supply holes 514 and a plurality of negative electrode water supply holes 524 are formed on each plate surface for the flow of the reused water;
The negative electrode (520) further includes a plurality of needles (522) protruding toward the positive electrode (510) to reduce the gap between the positive electrode and the positive electrode (510)
The first processor 500 is formed at an insertion end 610 of the second processor 600 so as to be inclined in the longitudinal direction of the inlet hole 620 at the tip of the inlet hole 620 formed in the insertion end 610, A tapered surface 612 is formed so that the treated plasma treated in the first plasma process can flow more easily and quickly;
The first processor 500, as well as the second processor 600, are all comprised of an insulator;
A semicircular ground electrode 640 is embedded in the inner circumferential surface of the second processor 600 at intervals. A surface of the ground electrode 640, that is, a surface disposed inside the second processor, is provided with a dielectric 650 for determining the capacitance to discharge and varying the degree of processing;
A flange F sliding along a slot formed in the dielectric 650 is formed at one end of the discharge electrode 660; A plurality of electrode through holes 662 are formed in the flange at intervals in the circumferential direction;
A slidable conical discharge electrode 660 is inserted into the dielectric; The body of the discharge electrode 660 has a diameter smaller than that of the flange F and a spring 670 which is pushed toward the insertion end 610 side is inserted into the tip of the discharge electrode 660, And a second process is performed by generating a plasma while generating a discharge when a predetermined voltage condition is reached while reciprocating according to a hydraulic pressure fluctuation and an amount of treated water flowing through the insertion end 610;
And a power supply for applying a voltage to the positive electrode and the negative electrode and applying a voltage to the ground electrode and the discharge electrode.

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