KR20010000782A - Waste water disposal plant - Google Patents

Abstract

PURPOSE: Provided is characterized in that hot wind is injected to the wastewater minutely by a hot wind injection part, and the interior pressure of an evaporation-concentration tank is negative as boiling point drop by a negative pressure generator. Also settled sludge of the evaporation-concentration tank is not suspended by a sludge-moving prevention plate, and guide pipe of hot wind is not degraded by heated wastewater recycling. Thereby, evaporation of the wastewater is promoted. CONSTITUTION: The equipment is characterized by the following devices: the hot wind injection part having micro holes (47), to inject hot wind (1000 mmHg, 1100 deg.C) to the wastewater of the evaporation-concentration tank (20) for wastewater evaporation; the negative pressure generator (100) being a fan, to maintain negative pressure (200-300 mmHg) in the evaporation-concentration tank (20); the sludge-moving prevention plate (55) to prevent settled sludge suspension in the evaporation-concentration tank (20); a ring type injection pipe (60) to recycle wastewater heated in the evaporation-concentration tank (20) for pre-heating of raw wastewater (1) and prevention of heat-degradation of the guide pipe of hot wind (45).

Description

Waste water treatment plant

The present invention relates to a wastewater treatment device, and more particularly, by evaporating hot air to a fine size and maintaining the inside of the evaporation tank at a negative pressure, the evaporation efficiency is improved, and there is no floating phenomenon in the evaporation tank of the settled sludge, even during long-term use. The present invention relates to a waste water treatment apparatus of a direct heating type, which is improved to prevent deterioration of hot air guide tubes.

In general, in order to treat wastewater in a dyeing plant, plating plant, and various wastewater discharge shops or wastewater treatment shops, a method of concentrating the wastewater, incineration, sludge-forming, and landfilling after drying and drying is used.

As such, in order to incinerate or cake the wastewater, the process of heating and concentrating the wastewater was first required. In the conventional wastewater treatment, the method of heating and concentrating the wastewater into a pipe of a boiler in which steam or hot water is circulated is used. Concentration by heating through wastewater is commonly used.

However, when the wastewater is concentrated by indirect heating using the boiler, the thermal efficiency of the wastewater is very low and the pipe inside the boiler is rapidly corroded due to a large amount of harmful substances, chemicals and other foreign substances in the wastewater. As a result, the scale accumulates on the inner circumferential surface of the tube, causing clogging of the tube even during a short time of use, resulting in a serious problem that the device eventually stops working.

Therefore, the conventional wastewater treatment apparatus is difficult to operate once for a long time, the wastewater treatment efficiency is low, and the maintenance cost is excessively required due to uninterrupted maintenance, which is uneconomical.

A recent technique proposed to solve this problem is a direct heating wastewater evaporation concentrator (wastewater treatment device) of Patent Application No. 98-1803.

As shown in FIG. 1, the direct heating wastewater treatment apparatus includes an evaporation concentration tank 120 for storing and evaporating the raw wastewater 1 supplied from a raw wastewater storage tank (not shown), and a blowing mechanism (not shown). The hot air supply unit 40 is integrally coupled to heat the high-pressure air injected by the ultra-high temperature state to blow downwardly to the evaporation tank 120 along the hot air guide pipe 145 disposed in the vertical direction. Up and down open sludge flow prevention drum 51 for suppressing sludge floating in the evaporation concentration tank 120 is installed, and the steam and concentrated sludge generated in the evaporation concentration tank 120 are discharged and stored in the atmosphere. It can be disposed of.

This will be described in more detail as follows. The combustor 41 of the cyclone chamber 42 provided at the upper portion of the hot air supply unit 40, that is, the ignition torch 44 and the burner 43 are operated to communicate with the cyclone chamber 42 in the ignited state. When high pressure air is forcedly injected through the blower tube 33, the hot air is blown downward to the evaporative concentration tank 120 through the hot air guide tube 145.

The through-hole 147 is formed at the end of the hot air guide pipe 145 to spray hot air into the wastewater of the evaporative concentration tank 120 in the form of air bubbles, and the high heat accompanying the hot air to the waste water. The waste water can be vaporized by being delivered. In addition, the outside of the hot air guide pipe 145 is surrounded by a heat insulating wall 48 to prevent heat leakage, the outside is sealed by the upper, lower hot air chamber housing (49a, 49b). .

In addition, the evaporation concentration tank 120 is in contact with the lower hot air chamber housing (49b) to form a sealed state, the sludge floating phenomenon by hot air injection around the lower end of the hot air guide pipe 145 extending therein Cylindrical sludge flow prevention drum 51 having an open lower end portion is fixed on the bottom plate 121 of the evaporation tank 120 in order to suppress the pressure. The raw wastewater inlet pipe 13 and the circulating discharge pipe 63 have liquefied water inlet pipes 124 and sludge discharge pipes 125 on the other side and the lower side thereof, and steam discharge pipes 123 formed on one side of the upper surface thereof. have.

The circulation discharge pipe 63 is coupled to a recirculation mechanism 64 consisting of a pump 65 and an opening / closing control valve 66 and heated wastewater therein through the induction pipe 62 of the lower hot air chamber housing 49b. The wastewater re-introduced in this way and re-introduced in this way was received outside the cylindrical blocking wall 142 formed inside the hot air guide pipe 145 and formed at a predetermined interval around the upper portion of the notch part 143. After cooling the hot air guide pipe 145 while flowing uniformly along the inner circumferential surface of the hot air guide pipe 145 in the V-groove, it is joined to the evaporative concentration tank 120.

That is, in the direct heating type wastewater treatment device having the structure as described above, the hot air guide tube (hot air guide) 145 is melted or deteriorated by the high temperature hot air to prevent damage to the hot air guide tube. Cyclic recirculation mechanism 64 capable of repeatedly circulating along the inner circumferential surface of 145 is provided, and has a cylindrical blocking wall having notches 143 at predetermined intervals along the inner upper periphery of the hot air guide pipe 145 ( 142 is formed to form a structure in which the waste water flows toward the inner circumferential surface of the hot air guide pipe 145 through the notch 143, the upper portion of the blocking wall 142 and the blocking wall 142. Although a plurality of notches 143 formed at the periphery perform a function of flowing the waste water evenly, this is because various foreign matters (scales) contained in the waste water accumulate in the blocking wall 142 and the notch 143 within a short time. Unique feature By paralyzing, there is a problem in that the deterioration state of the hot air guide pipe 145 cannot be effectively controlled, and in order to prevent the hot air guide pipe 145 from being overheated and damaged, the device is stopped for a certain time and then cooled to some extent. There is a hassle of maintenance and maintenance, such as waiting until the hot air supply unit 40 is disassembled to remove the scale accumulated therein.

In addition, the wastewater treatment device is not only able to effectively control the sludge floating up and down due to the structural defect of the sludge flow prevention drum 51, the bottom plate 121 of the evaporation concentration tank 120 is a flat structure There is also a problem that the sludge can not be discharged smoothly.

The present invention has been proposed in order to solve the above-mentioned problems, the object of which is high energy efficiency by heating by directly supplying hot waste water of high temperature and high pressure heated by a burner, and by recycling the heated waste water By implementing the nozzle spray method, it is possible to continuously cool the hot air guide pipe without accumulating scale even during long-term use, and maximize the processing capacity by increasing the operation rate of the device by minimizing the work loss for the maintenance and maintenance of the device. To provide a wastewater treatment apparatus.

In addition, another object of the present invention is to suppress the sludge floating phenomenon in the evaporation tank of the precipitated sludge by spraying hot air to a fine size, and also to keep the internal environment in a negative pressure state to enable rapid evaporation reaction and sludge separation An object of the present invention is to provide an apparatus for treating wastewater.

In addition, another object of the present invention to provide a wastewater treatment apparatus that can easily discharge the concentrated sludge.

Figure 1 is a longitudinal sectional view showing the structure of the evaporative concentration tank and hot air supply unit applied to the wastewater treatment apparatus according to the prior art.

Figure 2 is a schematic configuration diagram showing the overall structure of the wastewater treatment apparatus according to the present invention.

Figure 3 is a longitudinal sectional view showing the structure of the evaporation tank and hot air supply unit applied to the wastewater treatment apparatus according to the present invention.

Figure 4 is a bottom perspective view of the ring-type injection pipe applied to the wastewater treatment apparatus according to the present invention.

Figure 5 is a partial cutaway perspective view of the sludge flow prevention mechanism applied to the wastewater treatment apparatus according to the present invention.

<Description of the code | symbol about the principal part of drawing>

One ; Wastewater 2; Thickened sludge

10; Raw wastewater storage tanks 11, 26, 65, 81; Pump

12, 32, 66, 85, 87; Valve 13; Wastewater Inflow Pipe

20, 120; Evaporation tank 21; Floor slope

22; Sludge deposits 23, 123; Steam exhaust pipe

24, 124; Liquefied water inlet pipe 25, 125; Sludge discharge pipe

27; Collecting pipe 28; Concentrated Sludge Storage Tank

30; Blowers 31; air blower

33; Blower pipe 40; Hot Air Supply Unit

41; Combustor 42; Cyclone room

42a; Guide vanes 43, 91; burner

44; Ignition torch 45, 145; Hot Air Guide

46; Hot air spraying unit 47; Micropores

48; Insulation wall 49a; Upper hot air chamber housing

49b; Lower hot air chamber housing 50; Sludge Flow Prevention Mechanism

51; Sludge prevention drums 52, 57; Support angle

53, 58; Opening 55; Sludge Flow Check Plate

56, 147; Through-hole 60; Ring injection tube

61; Injection nozzle 62; Induction pipe

63; Circulating discharge pipe 64; Recirculation Mechanism

70; Demister 80; Preheater

72, 82, 83, 84, 86; Connector 90; Deodorization tank

100; Negative pressure generating unit 101; Discharge tube

102; Stack 121; Bottom plate

142; Barrier wall 143; Notch

Waste water treatment apparatus according to the present invention for achieving the above object, the vertical evaporation tank for storing and evaporating the raw waste water supplied from the raw waste water storage tank, by heating the high-pressure air injected by the blower to an ultra-high temperature state An airtight hot air supply unit is integrally coupled to blow down the evaporative concentration tank along the hot air guide tube disposed in a direction, and a sludge flow prevention drum of an open top and bottom type for suppressing sludge floating in the evaporative concentration tank is installed. In the wastewater treatment apparatus for discharging steam and concentrated sludge generated in the evaporation concentration tank to discharge and store the waste, the air is finely sprayed into the wastewater stored in the evaporation concentration tank to make contact with the wastewater. A plurality of micropores are formed along the end circumferential surface of the hot air guide tube to be activated And a sludge flow preventing plate which is horizontally disposed at a predetermined interval from the bottom surface of the bottom portion of the sludge flow preventing drum and the bottom circumference of the sludge flow preventing drum and blocks the settled sludge from floating, and is heated in the evaporating concentration tank. The waste water is forced to circulate, and then flowed back to the upper part and then sprayed downward, thereby preheating the waste water supplied from the waste water storage tank, preventing deterioration of the hot air guide tube, and pulverizing air bubbles generated when the waste water is heated. It characterized in that it is made to include a ring-shaped injection pipe.

Here, a demister is installed between the vapor discharge pipe and the liquefied water inlet pipe of the evaporative concentration tank so that harmful components discharged upon evaporation are re-introduced into the evaporative concentration tank with the liquefied water. After desorption, the deodorization tank is connected to burn and remove the odor associated with the steam by the burner heating, and the wastewater of the discharged steam can be heated between the connection pipe and the other connection pipe of the deodorization tank. A separate preheater is installed, and the preheater and the evaporative concentration tank and the preheater and the waste water storage tank are maintained in communication with each other, and the upper connection pipe of the preheater has a negative pressure below atmospheric pressure. In order to lower the boiling point of the stored waste water, a separate negative pressure generating part is provided. It is desirable.

In addition, the negative pressure generating unit is composed of a blower, it is preferable that the purified steam discharged by the discharge pipe of the blower is connected to the stack so that the air can be discharged smoothly.

In addition, the evaporation tank is preferably provided with a bottom slope plate by inclining the bottom plate downward at a predetermined angle so that sludge can be deposited smoothly to the center lower portion connected to the sludge discharge pipe.

In addition, the sludge flow preventing plate has a through hole formed in the center, a plurality of support angles are coupled between the sludge flow prevention drum and the upper surface adjacent thereto, and the bottom surface and the lower surface adjacent thereto so that the wastewater flows. It is preferable to install on the bottom inclined plate of the evaporation tank so as to have an opening.

Hereinafter, a wastewater treatment apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 to 5 shows a wastewater treatment apparatus according to the present invention, Figure 2 is a schematic configuration diagram showing the overall structure of the wastewater treatment apparatus according to the present invention, Figure 3 is an evaporation concentration tank 20 applied to the present invention And a longitudinal sectional view showing the structure of the hot air supply unit 40, FIG. 4 is a bottom perspective view of the ring-type spray pipe 60 applied to the present invention, and FIG. 5 is a partial cutaway perspective view of the sludge flow preventing mechanism 50 applied to the present invention. Will be shown respectively.

As shown in the figure, the wastewater treatment apparatus according to the present invention, the raw wastewater storage tank 10, the raw wastewater (1) is collected, and receives the raw wastewater (1) from the raw wastewater storage tank 10 The evaporation concentration tank 20 and the blower mechanism 30 for forcibly injecting high temperature and high pressure hot air into the evaporation concentration tank 20 and the blower mechanism 30 in communication with the evaporation concentration tank 20 Sludge flow preventing mechanism (50) integrally coupled to the upper part and provided with a combustor (41) and a hot air guide pipe (45), and fixed on the bottom plate inside the evaporation tank (20). ), A ring-type injection pipe (60) for recirculating the heated wastewater and spraying downward toward the outer circumferential surface of the hot air guide pipe (45) and the heated wastewater, and capturing harmful components and liquefied water accompanying vaporized and evaporated vapors. Demister 70 and re-introduction into the evaporation concentration tank 20, phase The steam passing through the demister 70 is heated again to preheat the deodorization tank 90 to remove and remove the odor, and the wastewater 1 partially introduced from the wastewater storage tank 10 by waste heat. Pre-heater (80) for recycling to the ring-type injection pipe (60), and forced discharge of the purified steam through the deodorization tank to the atmosphere and maintain the internal pressure of the evaporation concentration tank 20 in a negative pressure state It consists of a negative pressure generating unit 100 for activating evaporation.

The raw wastewater storage tank 10 stores primary wastewater 1 to be treated first. The wastewater 1 contains a large amount of water, and is connected to the evaporation tank 20 by the wastewater inflow pipe 13, and the wastewater 1 is disposed on the wastewater inflow pipe 13. A pump 11 for forcibly supplying to the evaporation concentration tank 20 and a valve 12 for opening and closing control are mounted.

The evaporation concentration tank 20 is in contact with the lower hot air chamber housing 49b which will be described later to form a closed state, the induction pipe 62 and the circulation discharge pipe 63 on one side, the lower side, the other side The upper and lower liquefied water inlet pipe 24 and the sludge discharge pipe 25, the upper surface side of the steam discharge pipe 23 is formed, respectively, concentrated sludge 2 to the lower center connected to the sludge discharge pipe (25) ), The bottom slope plate 21 and the sludge deposition portion 22 are formed by tilting the bottom plate downward at a predetermined angle so as to smoothly deposit the bottom plate.

In addition, on the sludge discharge pipe 25, a valve for opening and closing and a pump 26 are mounted to pass through the collection pipe 27, and the concentrated sludge 2 which is finally processed is disposed at the end of the collection pipe 27. Concentrated sludge storage tank 28 for storage is provided, and the pump 65 and the valve 66 is mounted between the induction pipe 62 and the circulating discharge pipe 63 to communicate with the ring-shaped injection pipe 60 The recirculation mechanism 64 is provided.

On the other hand, the blower 30 is a blower tube 33 on one side of the cyclone chamber 42 to inject high pressure air of about 1,000 mmHg into the cyclone room 42 in which the combustor 41 is located. The hot air heated in the ultra-high temperature state of about 1,100 ° C. by the burner 43 of the combustor 41 can be forced into the wastewater stored in the evaporation tank 20. The blower 30 is composed of a blower 31 and a valve 32, and is communicated to one side of the burner 43.

The hot air supply unit 40 is a combustor 41 of the cyclone chamber 42 provided at an upper portion thereof, that is, an ignition torch 44 for ignition with liquefied petroleum gas (LPG) or the like and a burner 43 for injection-injecting and supplying fuel. When the high-pressure air is forced into the cyclone method using the centrifugal force through the blower tube 33 communicating with the cyclone chamber 42 in the ignited state, the hot air is transferred to the evaporative concentration tank through the hot air guide tube 45. 20 is blown downward. The hot air guide pipe 45 is installed between the cyclone chamber 42 and the evaporation concentration tank 20 to guide the hot air of ultra-high temperature and high pressure into the waste water.

At the end of the hot air guide pipe 45, a hot air spray unit 47 having a plurality of fine holes 47 is formed to spray hot air into the wastewater of the evaporation tank 20 in the form of air bubbles having a fine size. It is possible to vaporize the wastewater by transferring the high heat accompanying the hot air to the wastewater. In addition, the outside of the cylindrical hot air guide pipe 45 is surrounded by a super heat-resistant material such as a heat insulating wall 48, that is, a fire brick (castable) to prevent heat leakage, the outside of the upper and lower sides The hot air chamber housings 49a and 49b are sealed.

As shown in FIG. 5, the sludge flow preventing mechanism 50 has a sludge flow preventing drum 51 similar to the existing structure and the sludge flow so that the sludge staying on the bottom slope plate 21 does not float upward. It consists of a sludge flow preventing plate 55 provided between the lower portion of the prevention drum 51 and the bottom slope plate 21.

The sludge flow preventing drum 51 has a plurality of support angles 52 formed at a lower portion thereof, and is welded to an upper surface of the sludge flow preventing plate 55, and an opening portion 53 is formed therebetween so that the wastewater flows in and out. The sludge flow preventing plate 55 has a through hole 56 formed at the center thereof, and a plurality of support angles 57 are welded between the bottom slope plate 21 and the bottom surface adjacent thereto. It is intended to have an opening 58 through which wastewater can flow.

The ring-type injection pipe 60 is forced to circulate the waste water heated in the evaporation concentration tank 20 to flow again to the upper portion through the induction pipe 62 and then to be injected downward from the raw waste water storage tank 10 The raw waste water 1 to be supplied is preheated, and the outer side of the hot air guide pipe 45 is cooled to prevent deterioration and the bubbles generated during heating of the waste water by the spraying force can be crushed. The injection nozzle 61 is formed in the bottom part side at regular intervals.

On the other hand, between the vapor discharge pipe 23 and the liquefied water inlet tube 24 of the evaporation concentration tank 20, the demister for allowing the harmful components discharged during evaporation to be re-introduced into the evaporation concentration tank 20 together with the liquefied water. 70 is installed, one side of the demister (70) to suck the steam inside through the connection pipe 72 and the deodorization that can burn off the odor accompanying the steam by the burner 91 The tank 90 is connected, and some of the raw waste water between the connecting pipes 72 and 82 and the other connecting pipe 83 of the deodorizing tank 90 using waste heat of steam discharged from the deodorizing tank 90. The preheater (80) capable of heating (1) is provided, and the valve is configured to open and close and circulate between the preheater (80) and the evaporative concentration tank (20), and the preheater (80) and the wastewater storage tank (10), respectively. Maintaining communication with a separate connector (84) (86), including (85) (87), the upper portion of the preheater (80) Gyeolgwan form has a structure in which the internal pressure of the evaporation concentration tank 20 is provided with the above-described negative pressure generating unit 100 so as to drop in the boiling point of the stored waste water to maintain a negative pressure below atmospheric pressure (200~300mmHg).

That is, the waste heat of high temperature flows into the space between the inner and outer cylinders of the preheater 80 from the deodorizing tank 90 and is discharged toward the negative pressure generating unit 100 through the upper connection pipe. When the pump 81 is operated when the predetermined time is opened, and some of the wastewater 1 flows into and is injected into the inner cylinder of the preheater 80 from the wastewater storage tank 10, the waste water circulates around the inner cylinder. After the wastewater 1 is heated, it is supplied toward the circulation discharge pipe 63 of the evaporative concentration tank 20 along the connection pipe 84. This is to further activate the reaction in the evaporative concentration tank 20 by preheating the wastewater supplied to the evaporative concentration tank by utilizing the waste heat having the purified steam discharged to the atmosphere.

In addition, the negative pressure generating unit 100 is composed of a blower (Fan), the purge steam discharged by the discharge pipe 101 of the blower is connected to the chimney 102 can be smoothly discharged to the atmosphere. At this time, the reason for lowering the boiling point by maintaining the internal pressure of the evaporation concentration tank in a negative pressure state, the evaporation is performed at a low temperature of about 80 ~ 90 ℃ due to the lower boiling point to improve the energy efficiency by that much For sake.

As described above, according to the wastewater treatment apparatus according to the present invention, there is an effect that can significantly improve the treatment efficiency and energy efficiency of the specific wastewater compared to the existing method. That is, the energy efficiency is high by directly supplying the hot and high pressure hot air heated by the burner to the raw waste water, and the scale is accumulated even in long-term use by implementing the multi-nozzle spraying method through the ring-type injection pipe by recycling the heated waste water. It is possible to continuously cool the hot air guide tube, and to maximize the processing capacity by increasing the operation rate of the device by minimizing the work loss for the maintenance and maintenance of the device.

In addition, according to the present invention, the hot air is injected to a fine size through the micro-pores, and the sludge floating phenomenon in the evaporation tank of the settled sludge is suppressed reliably, and the environment inside thereof is maintained at a negative pressure of about 200 to 300 mmHg and the boiling point is maintained. By lowering it, it is possible to quickly evaporate reaction and sludge separation by low temperature evaporation to realize an efficient treatment process, and to easily discharge concentrated sludge by self-weighting action according to the bottom slope plate structure of evaporation tank. There are various advantages.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, this may be regarded as exemplary, and those skilled in the art may conceive various modifications and equivalent embodiments therefrom. It should be understood that such equivalent embodiments are also included within the claims of the present invention. Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

Claims (5)

An evaporation concentration tank for storing and evaporating the raw waste water supplied from the waste water storage tank, and heating the high pressure air injected by the blower at an ultra-high temperature to blow air downward to the evaporation concentration tank along a hot air guide tube disposed in a vertical direction. A sealed hot air supply unit is integrally coupled, and an up-and-down open sludge flow prevention drum is installed to suppress sludge floating in the evaporation tank, and the steam and concentrated sludge generated in the evaporation tank are discharged to discharge the air. And a wastewater treatment apparatus capable of storing and treating waste, A hot air spraying unit in which a plurality of micropores are formed along an end circumferential surface of the hot air guide tube so as to finely spray hot air into the wastewater stored in the evaporative concentration tank to activate contact with the wastewater; A sludge flow preventing plate which is horizontally disposed at a predetermined interval from a lower circumference of the lower end of the sludge flow preventing drum and a bottom surface of the evaporation concentration tank to block the settled sludge from floating; And By forcibly circulating the heated wastewater in the evaporation condenser to be introduced again to the upper portion and then sprayed downward to preheat the wastewater supplied from the wastewater storage tank to prevent the deterioration of the hot air guide tube and at the time of heating the wastewater. And a ring-shaped spray tube capable of pulverizing the generated bubbles. The method of claim 1, Between the steam discharge pipe and the liquefied water inlet pipe of the evaporation tank is installed a demister for re-introducing the harmful components accompanying the evaporation with the liquefied water into the evaporation tank, one side of the demister suction the steam inside After the burner is heated, a deodorization tank for burning and removing the odor associated with the steam is connected, and between the connection pipe and the other connection pipe of the deodorization tank, a separate heat source for using the waste heat of the discharged steam can be heated. The preheater is installed, the preheater and the evaporation tank and the preheater and the waste water storage tank is maintained in communication with each other, the upper connection pipe of the preheater to maintain the negative pressure of atmospheric pressure below atmospheric pressure It is characterized in that the additional negative pressure generating portion is further provided to lower the boiling point of the stored waste water A waste water treatment apparatus. The method of claim 2, The negative pressure generating unit is composed of a blower, waste water treatment apparatus characterized in that the discharge pipe of the blower is connected to the stack so that the purified steam discharged smoothly to the air discharge. The method of claim 1, The evaporative concentration tank is a wastewater treatment apparatus, characterized in that the bottom slope plate is inclined downward at a predetermined angle so that the sludge is smoothly deposited to the center lower portion connected to the sludge discharge pipe. The method of claim 1, The sludge flow preventing plate has a through-hole formed in the center, and a plurality of support angles are coupled between the sludge flow preventing drum and the upper surface adjacent thereto and the bottom surface and the lower surface adjacent thereto so that the wastewater can flow. Waste water treatment apparatus, characterized in that installed on the bottom slope plate of the evaporation concentration tank to have an opening.