KR20060130974A - Waste water treatment apparatus using a ferrous catalyst air oxdization reaction vessel and a fast flocculation lamella sedimentation device and method thereof - Google Patents

Abstract

A waste water treatment apparatus by using a ferrous catalyst air oxidation reaction vessel and a fast flocculation lamella sedimentation device and a treatment method thereof are provided to effectively condense the in-degradable organic material and waste water containing various heavy metals. The original water is supplied at a side of an iron catalyst air oxidation reaction vessel(100). The first iron salt injection member includes the first iron salt tank(300) for storing the first iron salt. The first iron salt pump(310) injects the first iron salt into the iron catalyst air oxidation reaction vessel. A sodium hydroxide injection member includes a sodium hydroxide tank(400) for storing the sodium hydroxide. A sodium hydroxide pump(410) is connected with the sodium hydroxide tank and injects the sodium hydroxide constantly into the iron catalyst air oxidation reaction vessel.

Description

Waste water treatment apparatus using a ferrous catalyst air oxdization reaction vessel and a fast flocculation lamella sedimentation device and method

1 is an overall schematic configuration of a wastewater treatment apparatus using an iron catalyst air oxidation reaction tank and a high-speed flocculation gradient plate precipitation apparatus according to the present invention,

2 is a plan view of the wastewater treatment apparatus shown in FIG.

Figure 3a is a side configuration diagram of the iron catalyst air oxidation reaction tank 100 shown in FIG.

3B is an elevation view of the iron catalyst air oxidation reactor 100 shown in FIG. 1,

FIG. 4 is a plan view of the iron catalyst air oxidation reactor 100 shown in FIGS. 3A and 3B.

5 is a flow chart showing a treatment method of an apparatus for treating wastewater using an iron catalyst air oxidation reactor and a high speed flocculation gradient plate precipitation apparatus according to the present invention.

<Short Description of Main Reference Signs>

100: iron catalyst air oxidation reactor, 105: internally treated water,

110: first stirring motor, 120: stirring blade,

130: diffuser, 134: diffuser,

139: distribution pipe, 150: connector,

160: baffle, 190: turbulence generation plate,

200: high speed flocculation slant plate precipitation apparatus, 210: rapid flocculation tank,

215: second stirring motor, 225: third stirring motor,

227: first flow path forming plate, 229: second flow path forming plate,

220: slow flocculation tank, 230: inclined plate high speed precipitation tank,

235: inclined plate module, 237: overflow wear channel,

240: sludge collection feet, 250: collection feet pipe,

260: sludge conveying pipe, 265: conveying pump,

270: sludge discharge pipe, 275: discharge pump,

300: first iron salt tank, 310: first iron salt pump,

320: first iron salt supply pipe, 400: caustic soda tank,

410: caustic soda pump, 420: caustic soda supply pipe,

500: polymer coagulant tank, 510: polymer coagulant pump,

600: raw water collection tank, 610: raw water pump,

620: raw water supply pipe, 700: air intake,

710: air pump, 720: air supply pipe,

800: concentrated sludge storage tank, 900: treated water tank,

920: platform, 950: control panel.

The present invention relates to a wastewater treatment apparatus, and more particularly, to a wastewater treatment apparatus using an iron catalyst air oxidation reaction tank and a high-speed flocculation gradient plate precipitation apparatus, and a treatment method thereof.

Generally, the wastewater treatment system removes organic matter and suspended solids in the wastewater using the principle of flocculation and sedimentation. Such water treatment devices have been widely used to purify plant wastewater, livestock wastewater, domestic sewage, and the like.

However, the conventional water treatment apparatus discharges stable treated water only when a large sedimentation area and a long flocculation time are satisfied. Therefore, when these conditions were not met, there was a tendency to rely on excessive drug administration and specialty drugs to obtain stable treated water. As a result, drug costs, sludge treatment costs, etc. have risen, resulting in problems that are uneconomical and inefficient.

Recently, in order to solve this problem, a wastewater treatment apparatus in which a rapid agglomeration tank, a fast agglomeration tank, and an inclined plate high speed settling tank are connected in series has been developed and commercialized.

However, in the case of raw water to be treated with low efficiency of chemical coagulation or wastewater containing hardly decomposable organic matter and various heavy metals, such a single flocculation sedimentation method is not easy to remove. Representative examples of such hardly decomposable organic substances include incineration wastewater of heavy wastes such as heavy metals or organic matter, leachate from highly toxic landfills, wastewater containing a large amount of heavy metals discharged from plating plants, automobile coating plants, and paint plants, wastewater from chemical plants, Leachate from contaminated mines and contaminated surface water.

In addition, in order to purify various heavy metals and hardly decomposable wastewater, there is a disadvantage that not only has to go through several steps but also has high construction and operating costs (high amount and amount of injected drugs).

Therefore, the present invention has been made to solve the above problems, the first object of the present invention is to incinerate wastewater such as heavy wastes or organic matter mass incineration wastewater, leachate of a highly toxic landfill, plating factory or automobile coating factory, Sedimentation separation by efficiently coagulating low-efficiency or non-degradable organic substances and various heavy metal-containing wastewater in raw water, such as heavy metal wastewater from paint plants, wastewater from chemical plants, leachate from waste mines and contaminated surface water The present invention provides a wastewater treatment apparatus using an iron catalyst air oxidation reactor and a high-speed flocculent precipitation apparatus, and a treatment method thereof.

The second object of the present invention is an wastewater treatment apparatus using an iron catalyst air oxidation reactor and a high-speed flocculating sludge settling apparatus which are economical in construction cost and operating cost of the wastewater treatment device, and have excellent sludge settling property and good sludge dewatering effect, and treatment thereof. To provide a way.

The third object of the present invention is to use an iron catalyst air oxidation reactor and a high speed flocculation sludge settling device which can be easily applied to the treatment of wastewater having a high economic burden because it is difficult to remove in a general flocculation sedimentation method or a combination of several processes. It is to provide a wastewater treatment apparatus and a treatment method thereof.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

An object of the present invention as described above, iron catalyst air oxidation reaction tank 100 is supplied with raw water to one side; First iron salt injection means for injecting a constant ferrous salt (FeSO ₄ ) into the iron catalyst air oxidation reactor (100); Caustic soda injection means for injecting a constant caustic soda (NaOH) into the iron catalyst air oxidation reactor (100); One side is connected to the iron catalyst air oxidation reaction tank 100, the rapid aggregation tank 210 to receive the treated water; A slow aggregation tank 220 connected in series with the rapid aggregation tank 210; And a slant plate high speed precipitation tank 230 connected in series with the slow flocculation tank 220, wherein the sludge conveyed with air is introduced into the iron catalyst air oxidation reactor 100, and the rapid flocculation tank 210 is provided. It can be achieved by the wastewater treatment apparatus using an iron catalyst air oxidation reactor and a high-speed flocculation ramp plate precipitation device characterized in that the polymer flocculant is added.

And, the first iron salt injection means, the first iron salt tank 300, the first iron salt is stored therein; And a first iron salt pump 310 connected to the first iron salt tank 300 to inject a constant first iron salt into the iron catalyst air oxidation reactor 100.

In addition, the caustic soda injection means, caustic soda tank 400 in which caustic soda is stored; And a caustic soda pump 410 connected to the caustic soda tank 400 to inject a predetermined caustic soda into the iron catalyst air oxidation reactor 100.

In addition, the iron catalyst air oxidation reaction tank 100 includes a first stirring motor 110 provided on the iron catalyst air oxidation reaction tank 100; And at least one stirring vane 120 connected to the rotating shaft of the first stirring motor 110 to stir the inside of the iron catalyst air oxidation reactor 100. Here, the stirring blade 120 is preferably composed of the first stirring blade formed in the free end region of the rotary shaft, and the second stirring blade formed in the intermediate region of the rotary shaft.

In addition, the iron catalyst air oxidation reaction tank 100 may further include an air disperser 130, the air disperser 130 may include an air pump 710 for sucking air from the atmosphere; An air supply pipe 720 having one end connected to the air pump 710 and the other end extending to the bottom region of the iron catalyst air oxidation reactor 100; And at least one diffuser device 130 connected to the air supply pipe 720 to supply fine air from the bottom to the top of the iron catalyst air oxidation reactor 100.

In addition, two to ten diffuser portions 134 are provided, and each of the diffuser portions 134 is more preferably connected by a distribution pipe 139.

In addition, at least one turbulence generating plate 190 may protrude from the inner wall of the iron catalyst air oxidation reactor 100, and the turbulence generating plate 190 may be formed on the inner wall of the iron catalyst air oxidation reactor 100. It is preferable that dogs-8 are provided at predetermined intervals.

And, the inner wall of the iron catalyst air oxidation reactor 100, one end is extended to the upper portion of the reaction tank 100, the other end is further formed by a baffle 160 extending to the lower portion of the reaction tank 100, Most preferably, the first iron salt is introduced to the lower portion of the reactor 100 through the baffle 160.

In addition, the iron catalyst air oxidation reactor 100 may be cylindrical, rectangular, hexagonal, octagonal shape, in the case of a cylinder, the height is most preferably having a size of 2 to 3 times the diameter.

And, it is preferable that the rapid flocculation tank 210 is further provided with a polymer flocculant injection means, wherein the polymer flocculant injection means, the polymer flocculant tank 500, the polymer flocculant is stored therein; And a polymer coagulant pump 510 connected to the polymer coagulant tank 500 and injecting a constant polymer coagulant into the rapid coagulation tank 210.

In addition, the quick agglomeration tank 210 may be further provided with two second stirring motors 215 and the stirring blades, and the transfer aggregating tank 220 may further include a third stirring motor 225 and the stirring blades. .

In addition, one end of the collecting pit pipe 250 connected to the sludge collecting pit 240 of the inclined plate high-speed sedimentation tank 230; And it is most preferable that the suction side further comprises a sludge conveying pipe 260 connected to the collection pit pipe 250, the discharge side extending to the iron catalyst air conversion reaction tank (100).

In addition, one end of the collection pipe pipe 250 is connected to the sludge collection feet 240 of the inclined plate high-speed sedimentation tank 230; And it is most preferable that the suction side further comprises a sludge discharge pipe 270 connected to the collection pit pipe 250, the discharge side is extended to the concentrated sludge storage tank (800).

Objects of the present invention as described above as another category, supplying raw water to the iron catalyst air oxidation reactor (S10); Injecting a predetermined first iron salt (FeSO ₄ ) and caustic soda (NaOH) into the iron catalyst air oxidation reactor 100 (S20, S22, and S24); Introducing the treated water treated in the iron catalyst air oxidation reactor 100 into the rapid coagulation tank 210 (S30); Introducing the treated water treated by the rapid aggregation tank 210 into the slow aggregation tank 220 connected in series (S40); Introducing the treated water treated by the slow aggregation tank 220 into the inclined plate high speed precipitation tank 230 connected in series (S50); And discharging the treated water treated in the inclined plate high-speed sedimentation tank 230 to the treatment water tank 900, and drawing and discharging the precipitated sludge (S60, S70). It is also achieved by a wastewater treatment method using a high-speed flocculation ramp settler.

And, the discharging step (S70) preferably further comprises a step (S80) of conveying a portion of the sludge discharged to the iron catalyst air oxidation reaction tank 100 as the iron catalyst solids. Here, the sludge conveyed may be 5 to 20% by volume of the raw water input amount.

In addition, the injection step (S20, S22, S24) preferably further comprises the step (S26) of sucking the air from the atmosphere to supply the inside of the iron catalyst air oxidation reactor (100).

In addition, the rapid flocculation tank 210 inflow step (S30) is most preferably further comprises a step (S32) of injecting a polymer flocculant into the rapid flocculation tank 210.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a schematic configuration diagram of an apparatus for treating wastewater using an iron catalyst air oxidation reactor and a high-speed flocculation gradient plate precipitation apparatus according to the present invention. As shown in FIG. 1, the wastewater treatment apparatus of the present invention may be largely divided into an iron catalyst air oxidation reactor 100 and a high speed flocculation gradient plate precipitation apparatus 200.

The iron catalyst air oxidation reactor (100) is provided with an air diffuser (130) therein, and a first stirring motor and first and second stirring blades (120) connected to the rotating shaft are provided in a central region. In particular, the air diffuser 130 receives the compressed air through the air suction unit 700, the air pump 710 and the air supply pipe (720).

The raw water collection tank 600 and the raw water pump 610 serve to supply the raw water to be treated to the iron catalyst air oxidation reaction tank 100 by a predetermined amount.

The first iron salt tank 300, the first iron salt pump 310, and the first iron salt supply pipe 320 supply the first iron salt FeSO ₄ to the iron catalyst air oxidation reactor 100 at a predetermined ratio. Function

The caustic soda tank 400, the caustic soda pump 410, and the caustic soda supply pipe 420 function to supply caustic soda (NaOH) to the iron catalyst air oxidation reactor 100 at a predetermined ratio.

High-speed agglomeration inclined plate 200 is externally connected to the iron catalyst air oxidation reactor 100 through a connecting pipe 150, internally, a rapid agglomeration tank 210, a slow agglomeration tank 220 and The inclined plate consists of a high-speed precipitation tank 230.

Rapid agglomeration tank 210 is a square, and is configured to be discharged to the top by supplying the raw water through the connecting pipe 150, the two upper stirring motor 215 and the stirring blades are installed. In addition, the upper one side of the rapid coagulation tank 210, the polymer coagulant tank 500, the polymer coagulant pump 510 is configured to administer the organic polymer coagulant.

Slow coagulation tank 220 is a square, it is connected in series with the rapid coagulation tank 210, the water discharged through the upper portion of the rapid coagulation tank 210 is introduced into the slow coagulation tank 220, slow coagulation tank It is configured to be discharged through the lower portion of 220. A third stirring motor 225 and a stirring blade are installed at the center upper portion of the slow aggregation tank 220 to stir so that the aggregation is effectively performed.

One end of each of the first and second flow path forming plates 227 and 229 is connected to the lower portion of the slow aggregation tank 220, and the other end thereof is connected to the inclined plate high speed precipitation tank 230. The other end cross-sectional area is wider than the one end side cross-sectional area in order to allow the inflow of the inclined plate fast settling tank 230 at a gentle flow rate while flowing through the first and second flow path forming plates 227 and 229. The first and second flow path forming plates 227 and 229 are not connected to the inclined plate fast settling tank 230, so that the aggregates are not disassembled while the aggregates are introduced into the inclined plate fast settling tank 230, and the predetermined aggregates are not dismantled. The aging is continued due to the interference, and a very fast sedimentation effect can be obtained in the inclined plate fast settling tank 230.

The upper portion of the inclined plate high-precipitation tank 230 is rectangular and the lower portion has a substantially cylindrical shape, and a scraper (not shown) and a sludge collection pit 240 are installed at a lower portion thereof, and a plurality of inclined plate modules are assembled at the upper portion thereof. 235, the overflow wear channel 237 of the treated water, the scraper drive device (not shown), the treated water outlet, etc. are provided.

The scraper is provided in the vertical direction with a predetermined length, and a plurality of pickets are provided while maintaining a constant distance in the radial direction of the inclined plate high speed precipitation tank 230.

The sludge collection pit 240 is installed at the center of the bottom of the inclined plate high-speed sedimentation tank 230 so that sludge may be collected. The collected sludge is discharged to the outside of the inclined plate fast settling tank 230 through the collection pit pipe 250.

The inclined plate module 235 is a large upflow split type inclined plate, which is maintained at an angle of 50 to 70 degrees with respect to the horizontal direction, and the intermediate region is bent. Each side of the sloping plate has a trapezoidal corrugation at regular intervals. A plurality of such inclined plates are arranged at regular intervals. Therefore, the space between each inclined plate becomes a structure which has a cross section (foot column), and a series of parallel flow paths are formed.

The sludge collection pit 240 is connected to the collection pit pipe 250, and the conveying pump 265 and the discharge pump 275 are connected to each other through the collection pit pipe 250. The conveying pump 265 is for circulating a part of the collected sludge to the iron catalyst air oxidation reactor 100 through the sludge conveying pipe 260, the discharge pump 275 is surplus other than conveying through the sludge discharge pipe 270 It is a pump for discharging the sludge to the concentrated sludge storage tank (800).

2 is a plan view of the wastewater treatment apparatus shown in FIG. As shown in FIG. 2, the first iron salt tank 300, the caustic soda tank 400, and the polymer coagulant tank 500 are arranged side by side, and the first iron salt pump 310 is disposed between the iron catalyst air oxidation reactor 100. ), A caustic soda pump 410, a polymer flocculant pump 510, and the like are disposed. In FIG. 2, the display of the specific pipe will be omitted.

In the vicinity of the iron catalyst air oxidation tank (100) is a fast agglomeration tank 210, a slow agglomeration tank 220 and a high-speed flocculation inclined plate precipitation device 200 consisting of a ramp plate fast settling tank 230 is disposed, the operator's approach A platform 920 is provided to facilitate it.

In addition, an air pump 710 is provided in the vicinity of the iron catalyst air oxidation reactor 100, and a transfer pump 265, a discharge pump 275, and a control panel are located in the vicinity of the high-speed agglomeration inclined plate 200. 950 is provided.

3A is a side view of the iron catalyst air oxidation reactor 100 shown in FIG. 1, and FIG. 3B is an elevation view of the iron catalyst air oxidation reactor 100 shown in FIG. 1. As shown in FIG. 3, a first stirring motor 110 is disposed at an upper portion of the iron catalyst air oxidation reactor 100, and an air diffuser 130 is installed at a lower portion thereof. In particular, the air diffuser 130 is connected to the air supply pipe (720).

The baffle 160 is installed at one position on the circumference, and extends from the upper portion to the lower portion of the iron catalyst air oxidation reactor 100, and the upper and lower ends thereof are open. Therefore, various chemicals and raw water introduced into the iron catalyst air oxidation reactor 100 are directly injected into the lower portion of the iron catalyst air oxidation reactor 100 through the baffle 160.

The connection pipe 150 is formed in the substantially water level region of the internal treated water 105.

As shown in FIG. 3, the iron catalyst air oxidation reactor 100 is approximately cylindrical in shape and is designed at a relatively small diameter compared to the height. For example, the height of the iron catalyst air oxidation tank 100 is about 2 to 3 times the diameter. This is to ensure maximum time for mutual reaction when air, raw water, injected chemicals, and returned sludge move together in the vertical direction.

4 is a plan view illustrating the iron catalyst air oxidation reactor 100 shown in FIGS. 3A and 3B. As shown in FIG. 4, four diffusers 134 are disposed on the bottom, and each diffuser 134 is interconnected through a distribution pipe 139. A plurality of minute holes are formed on the surface of the diffuser 134, and the injected air is converted into fine air particles and introduced into the internal treated water 105.

The baffle 160 is a hollow rectangular cross section with an empty inside.

The turbulence generating plate 190 protrudes toward the center from the inner surface of the iron catalyst air oxidation reactor 100. This is to make the turbulence more easily generate turbulence while the internally treated water 105 which swirls and rotates by stirring impinges on the turbulence generating plate 190. That is, the reaction rate may be faster as the internal treated water 105 forms turbulent flow. Two to eight turbulence generating plates 190 may be arranged at equal intervals or differential intervals.

Hereinafter will be described in detail the treatment method of the wastewater treatment apparatus using the iron catalyst air oxidation reaction tank having a configuration as described above and the high-speed flocculation inclined plate precipitation apparatus. 5 is a flow chart showing a treatment method of an apparatus for treating wastewater using an iron catalyst air oxidation reactor and a high speed flocculation gradient plate precipitation apparatus according to the present invention. As shown in FIG. 5, first, raw water is supplied from the raw water collecting passage 600 to the iron catalyst air oxidation reactor 100 using the raw water pump 610 (S10).

Then, a predetermined ferrous salt (FeSO ₄ ) and caustic soda (NaOH) are injected into the iron catalyst air oxidation reactor 100 (S20, S22, S24). At the same time, the air pump 710 sucks air from the atmosphere and supplies the air to the air diffuser 130 inside the iron catalyst air oxidation reactor 100 (S26). In addition, a part of the sludge discharged is returned to the iron catalyst air oxidation reaction tank 100 as an iron catalyst solid (S80). Then, the first stirring motor 110 is operated to stir the internally treated water 105 by the first and second stirring vanes 120. As a result, raw water, ferrous salt, caustic soda, air, and iron catalyst solids are mixed and stirred in the iron catalyst air oxidation reactor 100.

The reason for adding caustic soda is as follows. That is, since an ordinary inorganic coagulant is acidic, an alkali adjuvant is needed in order to form an aggregate. If slaked lime is used, caustic soda, which is easy to handle and manage, is used because it is not easy to manage the injection device and facilities. It was found that the addition of caustic soda resulted in the formation of a very dense agglomerate between reactions and a very good settling property. Referring to the chemical reaction occurring in the iron catalyst air oxidation reaction tank 100 by this process in detail as follows.

FeSO ₄ → Fe ⁺² + SO ₄ ^2-

NaOH → Na ^{+ +} OH ^-

^{Fe +2 + 2OH - → Fe (} OH) 2

In other words, Fe ^{+ 2} (ferrous salt) of FeSO ₄ is formed from a hydroxide of Fe (OH) ₂ . Such Fe (OH) ₂ functions as a coagulated tuberculosis capable of adsorbing contaminants. Then, Fe ^{+ 2} (ferrous iron salt) is oxidized to Fe ^{+ 3} (ferrous iron salt) by the injected air.

Fe ⁺² + O ₂ ↔ Fe ⁺³ + O ₂ ㆍ

^{Fe +3 + 3OH - → Fe (} OH) 3

Fe (OH) ₃ functions as a coagulation tube with a stronger adsorption force than Fe (OH) ₂ .

The sludge (iron catalyst solid) to be returned is a high molecular compound in the form of a hydroxide aggregate (Fe (OH) ₃ ) of Fe ^{+ 3} (ferric iron salt). In the reaction process, the iron-catalyzed air oxidation reactor is able to effectively remove and contaminate contaminants in the raw water.

Wastewater containing reducing pollutants is characterized by oxidizing slowly by dissolved oxygen in water when aerated for a long time with air. For example, when oxidizing with air alone, more than 24 hours is required, whereas when iron salt is added, it can be oxidized within 30 to 60 minutes (high-speed treatment). When the iron salt is added thereto, the reaction rate is accelerated by the catalysis of the iron salt, and the oxidation reaction of air (oxygen) by the iron salt catalyst can oxidize the reducing inorganic material and some organic substances contained in the wastewater.

In addition, the returned sludge (iron catalyst solids) is formed of a Fe ^{+ 3} polymer compound (Fe (OH) ₃ ), thereby increasing the frequency of collision with particles by acting as homogenous clot between reactions.

This reaction mechanism allows the Fe ^{+ 2} (ferrous iron salt) and Fe ⁺³ (ferrous iron salt) to coexist in the iron catalyst air oxidation reactor 100 and to be aged as an amorphous aggregate having strong physical adsorption. . For example, Fe ⁺² (ferrous salt) and Fe ⁺³ (ferric salt) have a different range of adsorption of heavy metals. However, because they coexist, the range of heavy metals that can be adsorbed is considerably wider. This can be very useful, for example, in treating wastewater from incinerators. As a result, the sludge produced is far superior to common chemical mechanisms, with the ability to remove various heavy metals (e.g., Cu, Cr, Fe, lead, cobalt, zinc, etc.) and convert or adsorb and remove them into insoluble complexes with iron salts. The sedimentation resistance of is also good.

Next, the treated water 105 treated in the iron catalyst air oxidation reactor 100 is introduced into the rapid aggregation tank 210 through the connection pipe 150 (S30). At the same time, the polymer flocculant is injected into the rapid flocculation tank 210 (S32). As the polymer coagulant, a polyacrylamide series, which is one of the anionic polymer coagulants, is used. Then, the rapid stirring action occurs at a speed of about 180-240 rpm in the rapid aggregation tank 210 by the second stirring motor 215 and the stirring blade. Then, the polymer coagulant (A-polymer) is rapidly mixed with the coagulum produced in the iron catalyst air oxidation reactor 100 to maintain the coagulum (FLOC) at a high density, thereby increasing sedimentation.

In addition to these polymer flocculants, a weighted flocculent aid (20-80 μm porous clay mineral mixture) may be mixed and added as necessary. These weighted coagulant aids also efficiently coagulate and act as heterogeneous coagulation tuberculosis to increase coagulation and sedimentation efficiency.

Next, the treated water treated by the rapid agglomeration tank 210 is introduced into the slow agglomeration tank 220 connected in series (S40). Then, slow stirring is performed by the third stirring motor 225 and the stirring blade at a speed of about 30 to 60 rpm. The coagulum then coarsens due to slow stirring for a sufficient time. This is to maximize the solid-liquid separation in the next process.

Then, the treated water treated by the slow flocculation tank 220 is introduced into the inclined plate high speed precipitation tank 230 connected in series (S50). At this time, the coarse aggregates are sedimented and sedimented, and the liquid passes through the inclined plate module 235 and is then sent to the treatment tank 900 through the overflow weir channel 237 (S60). That is, the time required for the solid-liquid separation through this process can be greatly shortened.

Next, the treated water discharged from the inclined plate high speed precipitation tank 230 is discharged to the treated water tank 900, and the precipitated sludge is drawn out through the sludge collection pit 240 (S70). The discharged settling sludge is sent to the concentrated sludge storage tank 800 through the discharge pump (275). Then, the sludge of about 5% to 20% by volume of the raw water input is fed back into the iron catalyst air oxidation tank 100 by the transfer pump 265 (S80).

The sludge to be returned acts as a homogenous tuberculosis between the reactions because it is an aggregate of Fe ⁺³ (Fe (OH) ₃ ). Therefore, the collision density and the frequency of the particles are increased, and the iron catalyst air oxidation reaction by the chemical agent (FeSO ₄ ) injected into the Fe ^{+ 2} in the oxidation reaction tank 100, together with the coexisting amorphous aggregates of Fe ^{+ 2} and Fe ^{+ 3} Allow it to mature.

As this process is repeated repeatedly, the raw water is converted into treated water and stored in the treatment tank 900, and the concentrated sludge is accumulated in the storage tank 800.

Specific parameters of the wastewater treatment apparatus using the iron catalyst air oxidation reaction tank and the high-speed flocculent precipitation apparatus according to the present invention and the treatment method thereof are as follows. In other words,

The residence time of the iron catalyst air oxidation reactor 100 is 30 minutes to 60 minutes, the stirring speed of the iron catalyst air oxidation reactor 100 is 180 to 240 rpm, and the residence time of the rapid aggregation tank 210 is 3 minutes to 6 minutes. Minutes, the residence time of the slow aggregation tank 220 is 7 minutes to 10 minutes, the residence time of the ramp plate fast settling tank 230 is 30 minutes to 50 minutes.

In another modified embodiment of the rapid settling tank 230 of the present invention, the lower portion of the rapid settling tank 230 may be manufactured in a quadrangular pyramid or a cone shape. In this case, a scraper may not be installed.

In addition, in the present invention, in addition to the disclosed embodiments as necessary, in each step, a separate chemical or substance can be added to facilitate the treatment process.

According to the wastewater treatment apparatus using the iron catalyst air oxidation reaction tank according to an embodiment of the present invention and the high-speed flocculation slant settling apparatus, and the treatment method thereof, incineration of hazardous waste such as heavy metals or organic matter mass, It contains low efficiency of chemical coagulation or hardly decomposable organic substances and various heavy metals in raw water such as leachate, wastewater containing a large amount of heavy metal discharged from plating factory, automobile coating factory, paint factory, wastewater from chemical plant, leachate from waste mine, contaminated surface water, etc. Wastewater and the like can be efficiently aggregated to settle and separate. Therefore, environmental pollution can be minimized.

In addition, the construction cost and the operating cost of the wastewater treatment device are economical, and the sludge sedimentation property is excellent as well as the sludge dewatering effect is good. Therefore, even small and medium-sized enterprises can be installed and operated without great economic burden.

In addition, since it is difficult to remove in a general flocculation sedimentation method or must combine several processes, it can be easily applied to the treatment of wastewater having a large economic burden.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (19)

Iron catalyst air oxidation reaction tank 100 is supplied raw water to one side; An air dispersing device 130 installed below the iron catalyst air oxidation reactor 100; First iron salt injecting means for injecting a constant ferrous salt (FeSO ₄ ) into the iron catalyst air oxidation reactor (100); Caustic soda injection means for injecting constant caustic soda (NaOH) into the iron catalyst air oxidation reactor (100); One side is connected to the iron catalyst air oxidation reaction tank 100, the rapid aggregation tank 210 to receive the treated water; Polymer flocculant injection means for injecting the polymer flocculant into the rapid coagulation tank 210; A slow agglomeration tank 220 connected in series with the rapid agglomeration tank 210; And An inclined plate high speed precipitation tank (230) connected in series with the slow flocculation tank (220); and a wastewater treatment apparatus using an iron catalyst air oxidation reactor and a high speed flocculation gradient plate precipitation apparatus. According to claim 1, wherein the first iron salt injection means, A first iron salt tank 300 in which the first iron salt is stored therein; And The iron catalyst air oxidation reactor and the high-speed aggregation, characterized in that the first iron salt pump 310 is connected to the first iron salt tank 300 to inject a constant first iron salt into the iron catalyst air oxidation reactor (100) Wastewater treatment device using inclined plate settling device. The method of claim 1, wherein the caustic soda injection means, A caustic soda tank 400 in which caustic soda is stored; And Iron catalyst air oxidation reactor and high-speed agglomeration inclined plate precipitation apparatus, characterized in that consisting of a caustic soda pump 410 is connected to the caustic soda tank 400 to inject a constant caustic soda into the iron catalyst air oxidation reactor (100) Wastewater treatment device using. According to claim 1, wherein the iron catalyst air oxidation reactor 100 A first stirring motor 110 provided above the iron catalyst air oxidation reactor 100; And And at least one stirring blade 120 connected to the rotating shaft of the first stirring motor 110 to stir the inside of the iron catalyst air oxidation reactor 100; and further comprising an iron catalyst air oxidation reactor. Wastewater treatment system using high speed flocculation slant settling device. The method of claim 4, wherein the stirring blade 120, An apparatus for treating waste water using an iron catalyst air oxidation reactor and a high-speed aggregation gradient plate settling device, comprising a first stirring blade formed in a free end region of the rotary shaft and a second stirring blade formed in an intermediate region of the rotary shaft. According to claim 1, The diffuser device 130, An air pump 710 for sucking air from the atmosphere; An air supply pipe 720 having one end connected to the air pump 710 and the other end extending to the bottom surface region of the iron catalyst air oxidation reactor 100; And The iron catalyst air oxidation tank and the high speed connected to the air supply pipe 720, characterized in that composed of at least one acidic unit 134 for supplying fine air from the bottom to the top of the iron catalyst air oxidation reactor 100 Wastewater treatment system using flocculation gradient plate settling device. 7. The iron catalyst air oxidation reactor and the high-speed agglomeration inclined plate precipitation apparatus according to claim 6, wherein four acidizers 134 are provided, and each acidizer 134 is connected by a distribution pipe 139. Wastewater treatment device using. According to claim 1, At least one turbulence generating plate 190 is formed protruding on the inner wall of the iron catalyst air oxidation reactor 100, wastewater treatment using the iron catalyst air oxidation reactor and the high-speed aggregation ramp plate precipitation apparatus Device. [9] The iron catalyst air oxidation reactor and the high speed agglomeration inclined plate according to claim 8, wherein the turbulence generating plates 190 are provided at two to eight inner walls of the iron catalyst air oxidation reactor 100 at predetermined intervals. Wastewater treatment device using sedimentation device. The baffle 160 of claim 1, wherein one end of the iron catalyst air oxidation reactor 100 extends to an upper portion of the reaction tank 100, and the other end of the iron catalyst air oxidation reactor 100 extends to a lower portion of the reaction tank 100. Formed, Raw water and the first iron salt is introduced into the lower portion of the reaction tank (100) through the baffle (160), characterized in that the iron catalyst air oxidation reactor and waste water treatment apparatus using a high-speed aggregation ramp plate precipitation apparatus. The wastewater treatment apparatus according to claim 1, wherein the iron catalyst air oxidation reactor (100) has a cylindrical shape. 12. The wastewater treatment apparatus according to claim 11, wherein the iron catalyst air oxidation reactor (100) has a size of two to three times the diameter of the iron catalyst air oxidation reactor. According to claim 1, wherein the polymer flocculant injection means, A polymer coagulant tank 500 in which a polymer coagulant is stored therein; And It is connected to the polymer flocculant tank 500 using the iron catalyst air oxidation reaction tank and the high-speed flocculation slant plate precipitation device, characterized in that consisting of a polymer flocculant pump 510 for injecting a constant polymer flocculant into the rapid flocculation tank 210 Wastewater treatment device. The method of claim 1, wherein the rapid flocculation tank 210 is further provided with two or more second stirring motor 215 and the stirring blade, The transport agglomeration tank 220 is a waste water treatment apparatus using an iron catalyst air oxidation reactor and a high-speed agglomeration gradient plate settling device, characterized in that the third stirring motor 225 and the stirring blade is further provided. The method of claim 1, A collecting pit pipe 250 having one end connected to the sludge collecting pit 240 of the inclined plate fast settling tank 230; And The suction catalyst is connected to the collection pipe tube 250, and the discharge side of the iron catalyst air oxidation reactor and high-speed agglomeration, characterized in that it further comprises a sludge conveying pipe 260 extending to the iron catalyst air conversion reaction tank 100. Wastewater treatment device using inclined plate settling device. The method of claim 1, A collecting pit pipe 250 having one end connected to the sludge collecting pit 240 of the inclined plate fast settling tank 230; And The suction catalyst is connected to the collection pipe pipe 250, and the discharge side of the iron catalyst air oxidation reactor and the high speed flocculation inclined plate precipitation apparatus further comprises a sludge discharge pipe 270 extending to the concentrated sludge storage tank (800). Wastewater treatment device using. Supplying raw water to the iron catalyst air oxidation reactor (S10); Injecting air sucked from the atmosphere, predetermined first iron salt (FeSO ₄ ), and caustic soda (NaOH) into the iron catalyst air oxidation reaction tank 100 (S20, S22, S24, and S26); Injecting the treated water treated in the iron catalyst air oxidation reactor (100) into a rapid coagulation tank (210) (S30) and injecting a polymer flocculant into the rapid coagulation tank (210); Introducing the treated water treated by the rapid coagulation tank 210 into the slow coagulation tank 220 connected in series (S40); Introducing the treated water treated by the slow flocculation tank 220 into the inclined plate high speed precipitation tank 230 connected in series (S50); And And discharging the treated water treated in the inclined plate fast settling tank 230 to the treated water tank 900, and drawing and discharging the precipitated sludge (S60 and S70). Wastewater treatment method using high speed flocculation slant plate sedimentation system. 18. The method of claim 17, wherein the discharge step (S70) is iron catalyst air, characterized in that it further comprises the step (S80) of conveying a portion of the sludge discharged as iron catalyst solidification air oxidation reaction tank (100) Wastewater Treatment Method Using Oxidation Reactor and High Speed Aggregate Inclined Plate Precipitation 18. The wastewater treatment method according to claim 17, wherein the sludge to be returned is 5 to 20% of the raw water input amount.

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