KR200194158Y1 - Waste water treating system - Google Patents

Abstract

The present invention relates to a wastewater treatment system for treating wastewater having a large amount of slurry such as wastewater or livestock waste, which is discharged from various industrial sites or livestock farms, which is collected in a collection tank 9 for collecting effluent wastewater. The waste water is supplied to the high concentration separation tank 20 through the connecting pipe W through the solid-liquid separator 10 in which the rollers 12 and 13 and the circular screen roller 11 are installed to separate the slurry. The high concentration separation tank 20 is provided with a stirring means 24 and a watering device 25 for agitating the waste water to float and remove impurities, and then removing the slurry. A low pressure voltage for agglomeration of impurities is imposed on the primary electroaggregation reactor 30, and a high pressure voltage for coagulation of fine impurities is supplied to the secondary electroaggregation reactor 30. Is approved for maintenance of sterilization After removing the foreign matter, the water passed through the electrocoagulation reaction tank is supplied to the primary slurry flotation tank 40 and the secondary slurry flotation tank 40 ', respectively, and after completion of the flotation and removal of the slurry, the filter filtration tank ( 50) and the microbial treatment and ozone treatment tank 60 is used as recycled water.

Description

Wastewater Treatment System {WASTE WATER TREATING SYSTEM}

The present invention relates to a wastewater treatment system for treating wastewater having a large amount of slurry, such as wastewater or livestock, which is discharged from various industrial sites or livestock farms. Solid-liquid separator to separate the liquid, high-density separation tank to separate slurry (impurity) and water by putting polymer flocculant into the solid-liquid separated wastewater, and electricity installed to be sterilized by passing electric current of low pressure and high pressure The flocculation reactor, the slurry flotation separation tank which raises and removes the slurry which electrolytically condensed waste water by stirring, the filter filtration tank which removes the organic heavy metal remaining in water with the filter layer, and the water which passed the filter filtration tank by microorganisms It consists of microbial treatment and ozone treatment tank that aeration and pass ozone treatment In addition, the slurry (impurity) contained in the wastewater discharged from livestock farms or industrial sites can be completely separated and recycled into water for recycling, and from solid-liquid separators to microorganisms and ozone treatment tanks for a certain period of time. The present invention relates to a wastewater treatment system that enables continuous treatment of wastewater, thereby increasing the efficiency of wastewater treatment and obtaining a complete wastewater treatment effect.

In general, various cabinet-type wastewater treatment systems that have been used universally in industrial sites and livestock farms by minimizing installation space have been developed and used until now, and most of these cabinet-type wastewater treatment systems use the principle of electrocoagulation. As an electrolytic treatment apparatus, this is to agglomerate impurities (slurry) contained in waste water in an electric reactor.

After the slurry in the wastewater forms the first agglomeration as described above, the flocculating agent is added in the slurry flotation tank, which is the next process, to form the stirring process, the impurities are reflocculated, the impurities are floated on the surface, and the injured impurities are scraped off. After removal through, the desired wastewater treatment is carried out by multi-stage soil filtration or spray spreading and evaporation.

However, in the conventional cabinet-type wastewater treatment method, the water treatment by the electric reaction is performed on the electrode plate in the electric reactor due to the positive and negative energization of the continuously used current, while the wastewater treatment is possible for a certain period of time. Impurities are generated, and in such a case, water treatment functions are lost. In the floating separation tank of slurry, relatively large particles can be removed, whereas small particles (impurities) are contained in the treated water and discharged without separation. In view of this, the treated water is passed through a sedimentation tank or several stages of filtration tank, and then the treated water is discharged. However, in the removal of such impurities, a large collection tank, sedimentation tank, filtration tank, etc. other than the cabinet type wastewater treatment system is discharged. Requires additional facilities and requires facility cost and space. Etc. will have a lot of problems.

The present invention has been devised to improve the above-mentioned problems. The purpose of the present invention is to raise livestock farms or industrial sites through solid-liquid separation tanks, high-density separation tanks and electroreaction flocculation tanks, filter filtration tanks, and microbial and ozone treatment collection tanks. It completely separates and removes the slurry (impurity) contained in the wastewater discharged from the wastewater into a recyclable water, and continuously treats wastewater from solid-liquid separator to microorganism and ozone treatment tank for a certain time. It is possible to provide a wastewater treatment system capable of increasing the efficiency of wastewater treatment at a low cost in a small space and achieving a perfect wastewater treatment effect.

1 is a schematic configuration diagram of a wastewater treatment system according to the present invention.

Figure 2 is a detailed structural diagram of the solid-liquid separation tank and the first and second floatation separation tank of the wastewater treatment system of the present invention.

3 is a detailed structural diagram of a high concentration separation tank of the wastewater pretreatment system of the present invention.

Figure 4 is a detailed structural diagram of the first and second electrocoagulation reactor of the wastewater treatment system of the present invention.

5 is a front sectional structure diagram of a filter filtration tank of the present invention.

Figure 6 is a cross-sectional structural view of the microorganism and ozone treatment tank of the wastewater aftertreatment system according to the present invention.

Explanation of symbols on the main parts of the drawings

9 ... collection tank 10 ... solid-liquid separator

11 ... screen roller 12,13 ... roller

15 ... water tank 20 ... high concentration separation tank

22,23 ... upper and undercoat 24 ... stirrer

25 ... Singer 26 ... Slurry Separation Passage

27 ... Slurry Recruitment 28 ... Scraper

29.Stirwing

30,30 '... primary and secondary electrocoagulation reactor

31,31 '... reservoir 32 ... electrode plate

33 ... shaft 34 ... electrode connection plate

35 Power cable 36 Connection method

37 ... Return room 38 ... Bulk

40,40 '... primary and secondary slurry flotation tanks

50 ... Filter filtration tank 51 ... Filter

52.Inclined end 53 ... Bulk wall

54 ... sump 56 ... filter

60 ... Microbial treatment and ozone treatment tank

61 ... 1st sump 62 ... 2nd sump

63 ... 3rd sump 64 ... ozone handler

65,65 '... Aeration means

As a technical configuration for achieving the above object, the present invention, the first water pump and the slurry pump to collect the waste water discharged to the first pump is a roller and a circular screen roller is installed inside the water and slurry of less than a certain size to pass through A solid-liquid separator in which a sump is installed,

The solid-liquid separation tank and the second pump is installed to communicate with the separation vessel vessel through a connection pipe provided, the upper and lower tanks are installed above and below the interior of the separation vessel vessel, the upper side of the lower tank agitated waste water A high concentration separation tank in which a stirring means and a water supply device are installed to float impurities, and a slurry collection tank is installed through a slurry separation passage to one side of the separation tank vessel;

The high concentration separation tank and the second connection pipe, which is divided into both sides through a partition wall inside the storage chamber is formed, the interior of the storage chamber is a plurality of electrode plates through the shaft to agglomerate slurry through the application of current. A primary and secondary electrocoagulation reaction tank connected to the shaft end, the electrode connecting plate being protruded to be connected with the power cable as a connecting means;

Upper and lower tanks are installed on the upper and lower sides of the separation vessel vessel in which the connection pipe is extended to one side of the storage chambers of the primary and secondary electrocoagulation reactors, and the waste tank is stirred on the upper side of the lower tank to raise impurities. A slurry floatation separation tank having a stirring means and a water supply device, and a slurry recruitment tank respectively installed through a slurry separation passage to one side of the separation vessel container;

A partition wall is installed at an upper side of the filtration vessel through which the water is supplied through the slurry floating separation tank and the connection pipe, a filter formed by stacking a plurality of layers inside the filtration vessel, and a water collecting tank through which the water is collected through an inclined end portion below. Filter filtration tank installed,

The aeration means is installed in the lower side of the primary collection tank into which microorganisms are introduced through the collection tank and the connection pipe of the filter filtration tank, and a secondary collection tank is formed on one side of the primary collection tank via a partition wall, and through the pipe to the upper side thereof. Ozone treatment for ozone treatment of water is installed, wastewater treatment characterized in that it comprises a microbial treatment and ozone treatment tank is installed aeration means to the lower side of the third collection tank, which is a recycling water storage tank provided on one side of the secondary collection tank By establishing a system.

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

1 is a schematic configuration diagram of a wastewater treatment system according to the present invention, the present invention is a solid-liquid separator 10, high concentration separation tank 20, primary and secondary electrocoagulation reaction tank (30) (30 ') and slurry Float separation tank 40, filter filtration tank 50, microorganisms and ozone treatment tank (60).

The solid-liquid separator 10 of the present invention has a roller 12 inside the solid-liquid separator 10 which is communicated with the first collection water tank 9 for collecting the effluent wastewater and the first pump P1, which is a slurry pump, as shown in FIG. 13) and the circular screen roller 11 is installed so as to pass through the slurry of water and a predetermined size or less to fall into the sump (15).

The rollers 12 and 13 installed in the solid-liquid separator 10 are coated with a rubber material for preventing slip, and the screen circular roller 11 is installed to separate and remove water and slurry.

The high-density separation tank 20 communicated through the connection pipe W provided with the solid-liquid separated collection tank 15 and the second pump P2 has a constant size inside and below the separation vessel container 21. In the state in which the upper and lower tanks 22 and 23 constituted of the upper and lower tanks 22 are installed, the stirring means 24 and the water-flow device 25 are installed above the lower tank 23 to raise the impurities by stirring the waste water. The slurry recruitment tank 27 is installed through the slurry separation passage 26 inclined toward one side of the separation vessel container 21.

At this time, the waste water stirring means 24 for stirring the waste water, the scraper 28 for removing the floating slurry in the slurry separation passage 26 above the shaft (S) that is extended to the motor (M) is 360 degrees It is installed so as to be rotatable, and a stirring blade 29 for floating the slurry is installed at the lower end of the shaft (S).

In addition, below the slurry recruitment tank 27 of the high concentration separation tank 20, a connecting pipe W for transferring the slurry to the solid-liquid separator 10 via a third pump P3 is allowed to communicate. The high and low water level detectors K1 and K2 for detecting the water level are installed at the upper and lower portions of the bath vessel 21.

In addition, the high concentration separation tank 20 and the primary and secondary electrocoagulation reaction tanks 30 and 30 ′, which are addressed to the connection pipe W, are shown in FIG. 4, through the partition 38 therein. The storage chambers 31 and 31 'are respectively formed, and a plurality of electrode plates 32 are formed in the storage chambers 31 and 31' so that the slurry agglomerates by application of current. A connection is established through 33, and an electrode connecting plate 34 is protruded to an end of the shaft 33 so as to be connected to the power cable 35 by the connecting means 36.

In this case, a low pressure voltage is applied to the primary coagulation reactor 30, and a high voltage for coagulation of fine impurities is applied to the secondary electrocoagulation reactor 30 ′. And a return chamber 37 is formed between the partition walls 38 of the secondary electrocoagulation reactors 30 and 30 'so as to transfer the suspended matter to the solid-liquid separator 10 through the connection pipe W.

In addition, the connection pipe (W) (W ') is delivered to the water chambers 31 and 31' of the primary and secondary electrocoagulation reactors 30 and 30 'so that the primary slurry flotation tanks 40 and 2 It will be connected to the secondary slurry flotation tank 40 '.

Primary and secondary slurry flotation tanks in which connecting pipes (W ') are directed to one side of reservoirs (31, 31') of the primary and secondary electrocoagulation reactors (30, 30 '), respectively. 40, 40 'is the lower tank in the state in which the upper and lower tanks 22, 23, which are formed in a predetermined size to the upper and lower sides of the separation vessel container 21 is installed, as shown in FIG. (23) On the upper side, a stirring means (24) and a watering device (25) are installed to stir the impurities by agitating the waste water, and the slurry is disposed through the slurry separation passage (26) inclined toward one side of the separation vessel vessel (21). Recruitment tank 27 is installed.

In addition, the partition 53 is installed on the upper side of the filtration vessel 51 of the filter filtration tank 50 through which water is supplied through the slurry floating separation tank 40, 40 ′ and a connection pipe. Inside the filtration vessel 51, a filter 56 that is formed by stacking a plurality of layers, and a collecting tank 54 for collecting water through the inclined end 52 downward.

At this time, the filter 56 installed inside the filter filtration tank 50 is easily installed and exchanged in a drawer type.

Subsequently, the microorganism treatment and ozone treatment tank 60 in which the microorganisms are introduced through the water collection tank 54 and the connection pipe W of the filter filtration tank 50 is introduced as shown in FIG. The aeration means 65 is installed in the lower side of the inner side, and one side of the primary water tank is formed in the secondary water tank 62 through the partition 66 formed with the discharge port 67 through the connecting pipe (W) to the upper side thereof. An ozone processor 64 for ozonating water is installed, and the aeration means 65 'is installed below the third collection tank 63, which is a recycling water storage tank provided at one side of the secondary collection tank 62. .

Referring to the operation and effects of the present invention made of such a configuration as follows.

As shown in Figures 1 to 6, the solid-liquid separator 10 collects the wastewater discharged from industrial sites or livestock farms to the collection tank (9), and included in the wastewater introduced from the collection tank (9) In order to remove solids, such as boulder, metal debris, and the like, large particles, the slurry (solid) and water (liquid) are physically applied as circular interlocking rollers (12) (13) to a state of moisture 70 °. The slurry and water are to be separated, and a certain amount of the first pump P1, which is a slurry pump, is transferred to the hopper 14 in the collection tank 9.

The waste water conveyed as described above is manufactured separately from the rollers 12 and 13 having a rubber coating to prevent slippage, and the water passes through the screen circular rollers 11 with a thickness of 0.5 mm or less. The slurry in the% state falls to the treatment plant and the water passing through the screen circular roller 11 falls into a constant sump 15.

Wastewater passed from the solid-liquid separator 10 as described above is a pre-treatment process to prevent the overload of the wastewater treatment system of the present invention, the high concentration separation tank 20 through the connection pipe (W) installed with the second pump (P2) Flows into.

3 is a view showing a high concentration separation tank according to an embodiment of the present invention, wherein the high concentration separation tank 20 includes a separation vessel container 21 having a predetermined size and having a substantially conical shape. Separation tank vessel 21 is composed of the upper and lower tanks (22, 23) is formed with an inclined surface inclined in a conical shape of the bottom surface from the top to the bottom, sedimentation in the form of a recessed form at the end of the inclined surface Slurry recruitment tank 27 is included, and the slurry recruited here is sent to the solid-liquid separator 10 through the connection pipe W provided with the third pump P3.

Furthermore, in the present embodiment, a slurry separation passage 26 is formed extending from the center of the upper tank 22 to the side, and has a round tank 27 'having a constant size up and down on the side, and through the water intake pipe at the lower portion thereof. The water supply device 25 is provided.

On the other hand, above the conical lower tank 23 includes a water mixing device 25 and the stirring means 24 for agitating the wastewater introduced from the water collecting tank 15 of the solid-liquid separator 10 to raise impurities to the waste water surface. Doing.

The stirring means 24 is provided with a stirring motor (M) in the appropriate position of the upper tank 22, extending the rotation shaft (S) of the stirring motor (M) to install a stirring blade 29 at its end , The stirring blade 29 is installed to be spaced apart from the lower water heater 25.

In addition, the upper tank 22 is provided with a scraper 28 that can be rotated 360 degrees to match the surface of the water, to collect the slurry floated to the water through the slurry separation passage 26 to the recruitment tank 27 ' , The scraper 28 is driven by the power from the reducer motor (M) installed in the upper center of the separation vessel 21 by the chain.

Therefore, the wastewater introduced from the solid-liquid separator 10 detects and regulates the inflow and outflow of the wastewater through a low water level detector K2 and a high water level detector K1 for detecting a constant water level, and the wastewater introduced with residual impurities is polymer. After adding and stirring the flocculant, the slurry floats to the water surface. At this time, the recycled water is passed through the connecting pipe (W) in the last water collecting tank (63) by using a water supply device (25) installed at the bottom to complete the slurry float. Let's do it.

The slurry is transferred to the recruitment tank 27 using the water purifier 25, and at the same time, the remaining impurities are precipitated for a predetermined time to precipitate the remaining impurities to separate the water and the impurities, and the separated water ( Treated water) is supplied to the primary electroreaction coagulation tank 30 through a connecting pipe W having the first pump P1 through a functional valve located below the separation vessel 21 without fluctuation of water.

The electroreaction coagulation tank 30 is intended to electroreact the impurities contained in the solid-liquid separation tank 10 and the high concentration separation tank 20 by separating the high concentration of wastewater slurry by electric method. This imposes an electric current on the introduced wastewater and destabilizes suspended particles, emulsified particles, and insoluble particles in the wastewater.

Impurities destabilized by electrocoagulation tend to go to the most stabilized state, and in this state of stabilization, solid particles containing fewer colloidal particles and less emulsified particles than the compound in equilibrium (initial wastewater) It will condense into larger particles. The ions (heavy metals) and colloids (organic and inorganic) contained in the waste water are charged with the same kind of charge. When the ions having opposite charges are added to the waste water containing these impurities, the destabilized particles are condensed and finally 1, It can be completely removed in the secondary slurry separation tank 40 (40 '), and the electroreaction aggregation neutralizes the charge of ions and particles, causing contaminants to float or precipitate.

Wherein the reaction rate of the electrolytic coagulation may vary according to the wastewater growth, but the treatment rate is 90% or more, and the remaining impurities are filtered in the primary and secondary slurry flotation tanks 40 and 40 'and the filter filtration tank 50, thereby reducing the standard water quality. It will change to the following process water.

As shown in FIG. 4, the electroreaction coagulation tanks 30 and 30 ′ have an open top and are rectangular in shape, and have storage chambers 31 and 31 ′ in which wastewater is stored, respectively. Waste water from above 31 'is connected to the primary slurry flotation tank 40 through the connecting pipe W, and to the secondary slurry flotation tank 40' through the other connecting pipe W '. Connected.

In addition, the two reservoirs 31, 31 'and the return chamber 37 are separated by both partitions 38, and the return chamber 37 is used to collect wastewater introduced into the reservoirs 31, 31'. By overflowing through the partition 38, the foam or float is pumped back to the solid-liquid separator 10 through a connecting pipe W.

In addition, a plurality of electrode plates 32 are installed in the storage chambers 31 and 31 ′ in a state where they are mounted on a stepped portion protruding at a suitable height from the bottom surface thereof, and each electrode plate 32 is provided. The interval is adjusted according to the characteristics of the wastewater to be treated, and the quantity thereof is also determined by the amount and characteristics of the wastewater to be treated.

At this time, in order to simplify the exchange of the electrode plate 32, a bolt is coupled to the shaft of the shaft 33 connecting the plurality of + electrodes and the -electrode plate 32 to fix the electrode connecting plate 34 to the electrode plate ( 32), the + electrode plate and the-electrode plate 32 to be connected by two power cables 35, the electrode connecting plate 34 is made of a small plate shape extending to a predetermined length It extends higher than the upper end of the reaction coagulation tanks 30 and 30 'and is connected by electrical connection means 36 at the upper end thereof.

The connecting means 36, the terminal is made by bolt coupling, and the structure is connected to the + electrode plate 32 and the-electrode plate 32 using the shaft 33 as a whole, removable removable free By doing so, workability is improved.

On the other hand, the slurry floatation separation tank 40, 40 'of the present invention is made of the same configuration and function as the high concentration separation tank 20 as shown in Figure 3, connected with the primary electric reaction coagulation tank 30 The first sludge flotation separation tank 40 for connecting the connecting pipe (W) to the other, and the other connection pipe (W) for connecting with the secondary electric reaction coagulation tank 30 'is connected to each other, the slurry separation flotation Water is introduced into the lower outlet of the tank (40) (40 ') through a connecting pipe (W) connecting the filter filtration tank (50).

5 is a view showing the filter filtration tank 50 of the present invention, the inclined surface is formed such that the lower inclined end portion 52 of the rectangular filtration vessel 51 gathers at the center thereof, and the partition 53 is formed on the top thereof to form water. When spraying the water is installed to prevent scattering to the upper side, the lower side of the rectangular water tank 54 is formed.

The slurry is removed, the clean water is sprayed to the filter 56 through the sprinkler 55 to filter the water downwards, the filter 56 stacked in a plurality of layers made of a drawer type that is easy to exchange and manage The water flows naturally while maintaining a constant distance between the filter 56 and the filter 56 is collected in the lower collecting tank 54, the foreign matter stays in the collecting tank 54 for a predetermined time, the pulp is provided with a connection pipe Through (W) is supplied to the collection tank 61 of the microbial treatment and ozone treatment (60).

The microbial treatment and ozone treatment 60 of FIG. 6 comprises a rectangular multistage water collection tank 61, 62, 63 of a constant size as a wastewater treatment system, and the water supplied through the connection pipe W is The primary collection tank 61 is collected to a certain level, at which time microorganisms are introduced while continuously operating the aeration means 65 to reprocess the water quality.

When the water level of the primary sump 61 rises to a certain height, the water flows naturally into the secondary sump 62 through the discharge port 67 of the side partition 66, and the water collected in the secondary sump 62 is 6 After stabilization for more than the time is collected in the tertiary collection tank (63) via the ozone processor (64). The water collected in the third collection tank 63 is continuously aerated and used as recycled water.

As described above, according to the wastewater treatment system according to the present invention, the slurry contained in the wastewater discharged from the livestock farm or industrial site through the solid-liquid separation tank, the high concentration separation tank, the electroreaction flocculation tank, the filter filtration tank, and the microorganism and ozone treatment collection tank. It completely separates (impurities) and makes it possible to recycle water, and also enables continuous treatment of wastewater over a period of time from solid-liquid separators to microorganisms and ozone treatment tanks. The cost increases the efficiency of the wastewater treatment, there is an excellent effect to obtain a complete wastewater treatment effect.

Although the present invention has been shown and described with respect to specific embodiments, it should be understood that the present invention may be variously modified and changed without departing from the spirit or the scope of the present invention provided by the following utility model registration claims. It will be clear to those skilled in the art that they can easily know.

Claims (6)

The roller 12 and 13 and the screen roller 11 are installed inside the raw water tank 9 for collecting the effluent and the first pump P1, which is a slurry pump, so that slurry of water and a predetermined size or less can be discharged. To pass through, the solid-liquid separator 10 is installed in the water collecting tank 15 on the lower side, It is installed to communicate with the separation vessel container 21 through the connection pipe (W) provided with the solid-liquid separated collection tank 15 and the second pump (P2), and to the upper and lower inside of the separation vessel container 21 Upper and lower tanks 22 and 23 are installed, and above the lower tank 23, agitating means 24 and a watering device 25 are installed to stir the waste water by agitating the waste water, and the separation tank container. (21) a high concentration separation tank 20 in which a recruitment tank 27 'is installed on one side via a slurry separation passage 26; The high concentration separation tank and the connection pipe (W), the storage compartments 31 and 31 'are formed in both sides through a partition 38 therein, and the storage chambers 31 and 31' are formed. A plurality of electrode plates 32 are connected to each other through the shaft 33 so that the slurry is agglomerated by application of a current therein, and the electrode connecting plate 34 is extended to the ends of the shaft 33 so as to connect the connecting means 36. Primary and secondary electrocoagulation reactors 30, 30 'to be connected to and installed with the power cable 35, The upper and lower tanks 22 (upper and lower) inside the separation tank vessel 21 in which the connection pipe W is extended to one side of the reservoir chambers of the primary and secondary electrocoagulation reactors 30 and 30 ', respectively ( 23) is installed, agitating means 24 and a watering device 25 for floating the waste water by stirring the waste water above the lower tank 23 is installed, the slurry separation passage 26 to one side of the separation vessel vessel. Slurry floatation separation tank (40) (40 '), each of which recruitment tank (27') is installed through A partition wall 53 is provided above the filtration vessel 51 through which water is supplied through the slurry floating separation tank 40, 40 ′ and a connection pipe, and a filter formed by stacking a plurality of layers inside the filtration vessel ( 56 and a filter filtration tank 50 provided with a water collecting tank 54 through which the water is collected through the inclined end 52 downward; The aeration means is installed in the lower side of the primary water collecting tank 61 in which the microorganisms are introduced through the water collecting tank and the connection pipe of the filter filtration tank 50, and the partition 66 is disposed at one side of the primary water collecting tank 61. A secondary sump tank 62 is formed, and an ozone processor 64 for ozonating water through a pipe is installed above the secondary sump tank 62, and is disposed below the third sump tank 63, which is a recycling water storage tank provided on one side of the secondary sump tank. Wastewater treatment system, characterized in that it comprises a microbial treatment and ozone treatment tank 60 is installed aeration means. The wastewater stirring means (24) for agitating the wastewater is a scraper (28) for removing the slurry floating on the upper side of the shaft (S) with which the motor (M) extends through the slurry separation passage (26). ) Is installed to be rotated 360 degrees, the waste water treatment system, characterized in that consisting of a configuration in which the stirring blades (29) for floating the slurry is installed at the bottom of the shaft (S). The connecting pipe (W) for transferring the slurry to the solid-liquid separator (10) via a third pump (P3) below the slurry recruitment tank (27) of the high concentration separation tank (20) so as to communicate. The high and low water level detectors (K1) and K2 for detecting water levels are installed at upper and lower portions of the separation vessel container. The method of claim 1, wherein a low voltage for the aggregation of the impurities is imposed on the primary coagulation reactor 30, and a high voltage for coagulation of the fine impurities is applied to the secondary electrocoagulation reactor 30 '. Wastewater treatment system characterized in that the configuration. The method according to claim 1, wherein the connection pipe (W) (W ') to the water chambers (31, 31') of the primary and secondary electrocoagulation reaction tank (30, 30 ') is the primary slurry flotation tank ( 40) and the secondary slurry flotation tank (40 '), each of which is to be installed and connected to the wastewater treatment system. The waste water treatment system according to claim 1, wherein the filter (56) installed in the filter filtration tank (50) is installed in a drawer type so as to be easily exchanged and managed.