KR101635465B1 - Energy generation system using treatment of wastewater - Google Patents

Abstract

Provided is an energy generation system using treatment of waste water sludge, configured to generate high energy without an external heat source and efficiently use the energy. The present invention includes: a primary heat exchanger where sludge is introduced such that the temperature therein is raised; a secondary heat exchanger where the sludge of which the temperature is raised in the primary heat exchanger is introduced such that the temperature therein is raised; an aerobic oxidizing vessel supplied with the sludge of which the temperature is raised in the secondary heat exchanger, for oxidizing and decomposing an organic material through an aerobic microorganism; a first digesting vessel supplied with the sludge of which the organic material is oxidized and decomposed in the aerobic oxidizing vessel, for digesting the sludge and supplying the sludge to the primary heat exchanger; a second digesting vessel supplied with the sludge discharged from the first heat exchanger, for digesting the sludge; a gas tank supplied with gas generated from the first digesting vessel and the second digesting vessel, for storing the gas; a generator for generating electric power by the gas supplied from the gas tank; a coolant supplying apparatus for supplying coolant to the generator;a hot water supplying line for introducing the coolant heated in the generator into the secondary heat exchanger to raise the temperature of the sludge; and a hot water outlet for discharging the coolant which has been used to raise the temperature of the sludge in the secondary heat exchanger.

Description

[0001] ENERGY GENERATION SYSTEM USING TREATMENT OF WASTEWATER [0002]

The present invention relates to an energy generating system through wastewater sludge treatment, and more particularly, to an energy generating system through wastewater sludge treatment, more specifically, by treating sludge such as sewage and wastewater through an aerobic oxidation tank, a first digestion tank and a second digestion tank, The present invention relates to an energy generation system configured to utilize biogas and calories.

There is known a wastewater sludge treatment system which can treat sludge generated in the sewage and wastewater treatment process and improve digestion efficiency and recycle the generated gas.

FIG. 1 is a view of a conventional wastewater sludge treatment system shown in Korean Patent Publication No. 10-1435950.

1, a conventional sludge treatment system includes a sedimentation tank 1 for collecting sludge by sedimenting organic matter in sewage, a sludge storage tank 2 for temporarily receiving sludge from the sedimentation tank 1, (4) for digesting the sludge supplied from the aerobic oxidizing tank (3), and an aerobic oxidizing tank (3) for oxidizing and decomposing the organic matter by aerobic microorganisms in the sludge supplied from the anaerobic digestion tank And a dehydrator (6) for dehydrating and discharging the sludge to the sludge cake.

The aerobic oxidizing tank 3 is capable of generating a self-heating by the reaction between an organic substance and an aerobic microorganism. The aerobic oxidizing tank 3 is installed at the front end of the digestion tank 4 and supplies the heat source of the digestion tank 4 to increase digestion efficiency. I have.

The digester 4 decomposes the concentrated sludge using an anaerobic microorganism. The organic matter in the organic wastewater is decomposed by the action of the anaerobic microorganism to generate biogas containing methane, and then sent to the gas storage tank 7 Loses. The biogas stored in the gas storage tank 7 can be used as renewable energy.

The digester 4 is divided into a high-temperature digester 4a and a middle-temperature digester 4b. The high-temperature digester 4a is a facility for extinguishing the pre-digested sludge from the aerobic oxidation tank 3 to be digested.

The sludge heat exchanger 5 does not directly flow the high temperature sludge digested in the high temperature digestion tank 4a into the middle temperature digester 4b but flows into the middle temperature digester 4b after heat exchange in the sludge heat exchanger 5, Heat exchanging is performed to raise the temperature of the sludge flowing into the intermediate-temperature digester 3, and the heat-exchanged sludge that is heat-exchanged can be introduced into the middle- temperature digester 4b.

In the above-described sludge treatment system, the aerobic oxidation tank 3 is provided at the front end of the high-temperature digester 4a to preheat and pre-digest the sludge, whereby the high- It is possible to reduce the maintenance cost by preheating the sludge to be introduced into the aerobic oxidation tank 3. The sludge is preliminarily extinguished in the aerobic oxidation tank 3 itself,

However, in the above-described conventional sludge treatment system, if the temperature of the sludge supplied to the aerobic oxidation tank 3 in winter is low or the temperature of the sludge in the aerobic oxidation tank 3 is low, the overall treatment efficiency may be significantly lowered

This requires heating by a separate heat source, which necessitates the installation of additional equipment, resulting in an increase in installation and maintenance costs.

Further, it is necessary to implement an optimized system that can generate high energy sufficiently without using an external heat source during operation of the processing system and utilize it because it can utilize it.

Accordingly, it is an object of the present invention to provide an energy generation system through a wastewater sludge treatment that can generate high energy even when there is no external heat source and can utilize energy efficiently .

Another object of the present invention is to increase the efficiency of the aerobic oxidation tank to increase the amount of gas generated in the digester, to operate the generator without supplying fuel to the outside by using the generated gas, and to provide a wastewater sludge treatment And to provide an energy generation system through the system.

Accordingly, the energy generation system through the wastewater sludge treatment according to the present invention comprises a primary heat exchanger in which sludge is introduced and heated, a secondary heat exchanger in which the temperature of the sludge whose temperature has risen in the primary heat exchanger flows, A first anaerobic oxidation tank for supplying sludge heated by the heat exchanger and oxidizing and decomposing organic matter by aerobic microorganisms, a first digester tank for supplying sludge by digesting the sludge oxidized and decomposed from the aerobic oxidation tank, A second digestion tank for receiving and extinguishing the sludge discharged from the primary heat exchanger, a gas tank for receiving and storing the gas generated in the first digestion tank and the second digestion tank, A generator for generating electric power, a cooling water supply device for supplying cooling water to the generator, A hot water supply line for introducing cooling water into the secondary heat exchanger to raise the temperature of the sludge in the secondary heat exchanger and a hot water outlet for discharging the cooling water in which the sludge has been heated by the secondary heat exchanger to utilize the hot water, .

In addition, in the energy generation system through the wastewater sludge treatment according to the present invention, the aerobic oxidation tank may include an oxidation tank main body for containing sludge therein to oxidize and decompose organic matter in the sludge by aerobic microorganisms, A bubble supplying means for supplying air bubbles from the sludge in the oxidation tank main body; a discharge port through which the sludge treated by the microorganism is discharged from the oxidation tank main body; Wherein the bubble supplying means includes a plurality of bubble supplying means arranged in a circumferential direction of the flow guiding cylindrical body so as to be spaced apart from each other and spraying bubbles horizontally in a single rotational direction about the flow guiding cylindrical body A plurality of first bubble spray nozzles and a plurality of spacers disposed around the inner peripheral surface of the oxidation tank main body And a second bubble jetting nozzle which is disposed at a lower position than the first bubble jetting nozzle and injects bubbles in a direction opposite to the rotating direction by the first bubble jetting nozzle Other features include inclusion.

In addition, in the energy generation system through the wastewater sludge treatment according to the present invention, a sludge rising up from the upper side of the first bubble spraying nozzle and disposed on the periphery of the flow guide cylindrical body is mixed in the oxidation tank main body A first sludge mixing means and a second sludge mixing means installed at a position between the first bubble jetting nozzle and the second bubble jetting nozzle for mixing sludge, A plurality of annular support frames disposed concentrically with each other at predetermined intervals around the cylindrical body 50 and a plurality of mixing leads arranged between the support frames to connect the plurality of support frames to each other, And the mixing guide plate is arranged to be inclined in one direction and in the other direction alternately while going outwardly from the flow guide cylindrical body Writing, and that the flow of sludge passing through the plurality of the supporting rim, so as to mix with the other in an inclined flow direction and inclined in one direction to the flow shows a further feature.

In addition, in the energy generation system through the wastewater sludge treatment according to the present invention, the second bubble jetting nozzle is inclined upward in the upward direction to give a lift force to the sludge so as to form a spiral locus in which the sludge rises, Wherein the second bubble jetting nozzle includes a plurality of pillar members supported by the flow guiding cylindrical member and the inner circumferential surface of the oxidation tank main body and a plurality of pillar members accommodated in the mesh member, The plurality of pillars are moved in the inside of the net.

The energy generation system through the wastewater sludge treatment according to the present invention is constructed so that the generator can generate hot water and electric power using the biogas generated in the digester, and the overall efficiency of the system can be increased by the heat generated incidentally Respectively. Accordingly, it is possible to generate profit by itself by the generated electric power and the hot water, and the energy consumption of the facility can be reduced.

Further, the energy generation system through the wastewater sludge treatment according to the present invention can be configured to increase the operation efficiency of the aerobic oxidation tank, thereby increasing the overall energy production efficiency of the system. In other words, the first bubble jetting nozzles and the second bubble jetting nozzles provided in the aerobic oxidation tank are injected to make the direction of rotation of the sludge flow opposite to each other, so that the sludge and the air bubbles are mixed more actively, It activates the action of aerobic microorganisms and increases calorific value.

In addition, in the aerobic oxidation tank, the first sludge mixing means and the second sludge mixing means are provided so that the mixture of sludge and air bubbles flowing upward can be generated evenly and actively, and the activity of the aerobic microorganisms is actively induced. As a result, the exothermic and preliminary digestion of the aerobic oxidation tank can sufficiently occur, so that the first digestion tank and the second digestion tank can further increase the biogas generation rate and the sludge reduction efficiency.

1 is a schematic diagram of a conventional wastewater sludge treatment system
FIG. 2 is a block explanatory diagram for explaining the overall configuration of an energy generation system through wastewater sludge treatment according to an embodiment of the present invention; FIG.
3 is a structural explanatory view for explaining the configuration of the aerobic oxidizing bath in the energy generation system through the wastewater sludge treatment according to the embodiment of the present invention
FIG. 4 is a cross-sectional view of an aerobic oxidation tank in an energy generation system through wastewater sludge treatment according to an embodiment of the present invention
FIG. 5 is a structural explanatory view of a first sludge mixing means installed in an aerobic oxidation tank in an energy generation system through wastewater sludge treatment according to an embodiment of the present invention. FIG.
FIG. 6 is a structural explanatory view of a second sludge mixing means installed in an aerobic oxidation tank in an energy generation system through wastewater sludge treatment according to an embodiment of the present invention. FIG.
7 is a structural explanatory view showing the constructions of the first digester and the second digester in the energy generation system through the wastewater sludge process according to the embodiment of the present invention

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

2, the energy generation system through the wastewater sludge treatment according to the embodiment of the present invention includes a primary heat exchanger 210 which is heated by the flow of sludge, and a primary heat exchanger 210 whose temperature rises in the primary heat exchanger 210 An aerobic oxidation tank 300 for oxidizing and decomposing organic matter by aerobic microorganisms supplied with the sludge heated by the secondary heat exchanger 230, A first digester 410 for receiving and extinguishing sludge oxidized and decomposed from organic matter from the tank 300 and supplying sludge to the first heat exchanger 210 and a second digester 410 for supplying sludge to the first heat exchanger 210 A second digestion tank 430 for receiving and extinguishing the discharged sludge after heating the sludge introduced into the first digestion tank 410 and the second digestion tank 430, A tank 500, a gas tank 500, A cooling water supply device 610 for supplying cooling water to the generator 600 and a cooling water heated by the generator 600 to a secondary heat exchanger 230 A hot water supply line 630 for heating the sludge in the secondary heat exchanger 230 and a hot water outlet 231 for discharging the cooling water in which the sludge has been heated by the secondary heat exchanger 230, ).

The primary heat exchanger 210 and the secondary heat exchanger 230 increase the temperature of the sludge supplied to the aerobic oxidation tank 300 and supply the aerated oxidation tank 300 with the sludge, Which promotes oxidative degradation by microorganisms.

The primary heat exchanger 210 is a place where the concentrated sludge introduced from the sludge storage tank is first heated up. In the process of supplying the sludge digested in the first digester 410 to the second digester 430, And is heated by heat exchange with the sludge in the path through which it is fed to the aerobic oxidation tank 300 in the primary heat exchanger 210.

Accordingly, the concentrated sludge supplied from the sludge storage tank to the temperature of 15 to 25 ° C is heated by the primary heat exchanger 210, so that the sludge can flow into the secondary heat exchanger 230 at 25 to 35 ° C, .

The secondary heat exchanger 230 is a part where heat exchange with the sludge is performed by flowing cooling water supplied to and discharged from the generator 600 to cool the generator 600. The cooling water is discharged through the generator 600 in a heated state The sludge heat-exchanged with the cooling water of the generator 600 while passing through the secondary heat exchanger 230 can be heated to about 40 ° C or higher.

The supply of cooling water to the secondary heat exchanger 230 is performed through a hot water supply line 630 connecting the generator 600 and the secondary heat exchanger 230. The hot water supply line 630, The hot water of the hot water level reaches 70 ~ 80 ℃.

The sludge is heated in the secondary heat exchanger 230 and the heat exchanged cooling water is discharged into the hot water outlet 231 in the state of hot water of approximately 50 to 60 ° C to be used for heating or crop cultivation in the facility or the area.

The aerobic oxidation tank 300 is a part for oxidizing and solubilizing the organic matter of the sludge by aerobic microorganisms.

The aerobic oxidizing tank 300 is a part capable of generating a self-heating by the reaction between an organic substance and an aerobic microorganism. The aerobic oxidizing tank 300 is installed at a front end of the digestion tanks 410 and 430 to supply heat sources of the digestion tanks 410 and 430 to increase digestion efficiency, .

In the present embodiment, the digester 410 and 430 are divided into a first digester 410 and a second digester 430, and the solubilized sludge is supplied from the aerobic oxidizer 300 and decomposed using the anaerobic microorganism , Sewage, sewage, and wastewater treatment facilities. In the digester tanks 410 and 430, the organic matter in the organic wastewater is decomposed by the action of anaerobic microorganisms (acid-producing bacteria and methane fermenting bacteria), resulting in biogas containing a large amount of methane that can be used as fuel.

7, the digestion tanks 410 and 430 include a supply pipe 411 to which sludge is supplied, a stirring device 412 to flow and stir the sludge, a gas pipe 413 to discharge the digestion gas generated therein, A discharge pipe 414 through which digested sludge is discharged, and the like, and is installed to reduce sludge and utilize it as renewable energy through the production of biogas.

The digestion tanks 410 and 430 are divided into a first digestion tank 410 and a second digestion tank 430.

The first digestion tank 410 is preliminarily digested from the aerobic oxidation tank 300 to supply and extinguish sludge at about 50 to 60 ° C. It is preferable to maintain the temperature in the first digester 410 at 55 ° C or higher.

The sludge supplied from the sludge storage tank 100 can be heated to about 40 ° C or higher by passing through the primary heat exchanger 210 and the secondary heat exchanger 230 without supplying a separate heat source, By self-heating by the reaction of aerobic microorganisms in the tank 300, it is possible to supply sludge of 50 ° C or more even in the winter when the outside temperature is low. In this embodiment, as described later, the aerobic oxidation tank 300 is structured such that the reaction of the microorganisms is activated and the sludge and the air are agitated aggressively so that sufficient heat can be generated.

The sludge, which is generated in the aerobic oxidation tank 300 by the action of the organic matter and the aerobic microorganisms, is supplied to the first digester 410, the sludge is exhausted in the first digester 410, Is supplied to and stored in the gas tank 500.

The digested sludge discharged from the first digestion tank 410 is supplied to the primary heat exchanger 210 and serves to raise the temperature of the sludge by heat exchange with the sludge in the path to the aerobic oxidation tank 300.

The digester sludge discharged from the first digester tank 410 and having been heat-exchanged in the first heat exchanger 210 flows into the second digester 430. The digested sludge at high temperature discharged from the first digestion tank 410 is sucked into the second digestion tank 430 while passing through the first heat exchanger 210. Therefore, Temperature.

In the second digester 430, the organic matter in the organic wastewater is decomposed by the action of the anaerobic microorganism to generate biogas that can be used as fuel. The biogas is supplied to and stored in the gas tank 500. The digested sludge discharged from the second digestion tank 430 is discharged through a centrifugal dehydrator.

The generator 600 is a facility for generating electricity by supplying biogas stored in the gas tank 500 and burning the biogas. The power generated by operating the generator 600 can be used or sold as electric power in the intestines.

The generator 600 is supplied with cooling water by the cooling water supply device 610 for cooling the equipment in the power generation process.

The cooling water is discharged in a state of hot water of 70 to 80 ° C. at the time of discharging after performing a cooling action inside the generator 600. The cooling water at such temperature is used for raising the temperature of the sludge to be introduced into the aerobic oxidation tank 300 And is supplied to the secondary heat exchanger 230.

The cooling water that has passed through the secondary heat exchanger 230 is discharged into the hot water outlet 231 in the state of hot water of 50 to 60 ° C and can be used as hot water for heating in the facility or in the area or used for crop cultivation. Accordingly, it is possible to provide an energy generation system having a structure capable of reducing energy consumption and reducing maintenance cost.

The aerobic oxidation tank 300 is a part for supplying the pre-digested sludge at a sufficiently high temperature to the first digester 410. The specific configuration of the aerobic oxidation tank 300 that can increase the energy generation efficiency as described above will be described below.

3, the aerobic oxidation tank 300 includes an oxidation tank main body 10 for containing sludge therein for oxidizing and decomposing organic matter in the sludge by aerobic microorganisms, (30) for supplying air bubbles in the sludge in the oxidation tank main body (10), and a sludge supplying means (20) for supplying sludge to the microorganism in the oxidation tank main body (10) An outlet 40 through which the sludge treated by the sludge is discharged, and a flow guide cylinder 50 vertically installed in the center of the oxidation tank main body 10.

The oxidation tank main body 10 is a vertically erected cylindrical tank for receiving sludge, and the sludge supplied by the sludge supply means 20 is accommodated therein while being treated by aerobic microorganisms.

The sludge supply means 20 is for supplying sludge to the oxidation tank main body 10 from the sludge storage tank 100 and includes a sludge supply pipe line 24 and a sludge supply pump 26, And a spray supply pipe 25 for spraying the sludge inside the oxidation tank main body 10. The spray tank 25 is connected to the head tube body 23 and the spray tank 25,

The sludge is first supplied to the head tube 23 by the sludge supply pipe path 24 and the sludge supply pump 26 and then supplied to the inside of the oxidation tank main body 10 by the spray supply pipe 25 in the head tube 23 .

A plurality of spray supply pipes 25 are dispersed in the entire circumference of the head tube 23 so that the sludge is uniformly and uniformly distributed on the inner upper surface of the oxidation tank main body 10.

The sludge suction port 36c is located in the lower part of the vertical flow guide cylindrical body 50 and the sludge is sucked by the return flow line 36a and the reflux pump 36b and the second bubble jet nozzle 36, So that the sludge is circulated so as to be evenly mixed.

The upper end 53 of the flow guiding cylinder 50 is opened and its open top 53 is located below the water surface of the sludge so that the sludge flows into the interior of the flow guiding cylinder 50.

A through hole 54 is formed in the lower portion of the flow guide cylindrical body 50 and allows the flow of the sludge to the inside and outside of the flow guide cylindrical body 50 through the through hole 54.

On the other hand, the discharge port 40 is a portion through which the sludge treated by the aerobic microorganisms is discharged from the oxidation tank main body 10, and is opened to allow the sludge to flow naturally when the level of the sludge reaches the discharge port 40.

The flow guiding cylinder 50 is vertically installed at the center of the oxidation tank main body 10 and is installed to guide the flow of the sludge in the oxidation tank main body 10.

The bubble supplying means 30 supplies air bubbles in the sludge to activate the action of the aerobic microorganisms.

3 and 4, a plurality of bubble supplying means 30 are disposed around the flow guiding cylindrical body 50 with a gap therebetween, so that one direction of rotation about the flow guiding cylindrical body 50 A plurality of bubbles are disposed around the circumference of the oxidation tank main body 10 and spaced apart from each other around the circumference of the inner circumferential surface of the oxidation tank main body 10, And a second bubble jetting nozzle (36) for jetting bubbles in a direction opposite to the rotational direction by the first bubble jetting nozzle (31) at a position lower than the first bubble jetting nozzle (31).

The air supply line 38 for supplying air to the bubble supplying means 30 contacts the hot water discharge line 233 for discharging the hot water from the hot water discharge port 231, Lt; / RTI >

This is to prevent low temperature air from being blown into the aerobic oxidizing tank 300 by the bubble supplying means 30 in a state where the temperature of the outside air such as the winter season is low so as not to lower the microbial activity in the aerobic oxidizing tank 300 .

Reference numerals 31a and 36d denote air supply lines branched from the air supply line 38 to supply air to the first bubble jetting nozzle 31 and the second bubble jetting nozzle 36. [

The first bubble spraying nozzle 31 and the second bubble spraying nozzle 36 are arranged in the circumferential direction of the flow guide cylindrical body 50 in such a manner that bubbles are formed in four directions at uniform intervals in the tangential direction of the flow guide cylindrical body 50 The air is supplied to the aerobic microorganisms through the air bubbles, and the sludge flows together with the air.

The sludge in the oxidation tank main body 10 generates a flow rotating in one direction between the inner surface of the oxidation tank main body 10 and the flow guide cylindrical body 50 by bubble injection of the first bubble spraying nozzle 31, The bubble jetting of the two bubble jetting nozzles 36 causes a flow rotating in the opposite direction.

Accordingly, the flow of the sludge rising while drawing the spiral locus by the first bubble spraying nozzle 31 and the flow of the sludge rising by drawing the spiral locus by the second bubble spraying nozzle 36 are shown in Fig. As a result, the sludge and the air bubbles are actively mixed with each other, thereby creating an environment in which the aerobic microorganisms are sufficiently supplied with air and inducing active activity.

In the oxidation tank 10, a first sludge mixed with sludge which is installed on the periphery of the flow guiding cylinder 50 on the upper side of the first bubble spraying nozzle 31, And a second sludge mixing means 73 installed at a position between the first bubble jetting nozzle 31 and the second bubble jetting nozzle 36 to mix the sludge.

The first sludge mixing means 71 and the second sludge mixing means 73 mix the sludge and the air bubbles uniformly and actively so that the air is sufficiently supplied to the aerobic microorganisms, So that the temperature of the sludge discharged to the first digester 410 can be increased by the action of active aerobic microorganisms.

5, the first sludge mixing means 71 includes a plurality of annular support tows 71a concentrically arranged at predetermined intervals with respect to the flow guide cylindrical body 50, And a plurality of mixing guide plates 71b and 71c disposed between the support frames 71a and connecting the plurality of support frames 71a to each other.

The plurality of support frames 71a have a ring shape in which a plurality of gradually increasing diameters are sequentially arranged at regular intervals and formed into a band.

The mixing guide plates 71b and 71c connect the plurality of supporting frames 71a to each other between the plurality of supporting frames 71a so that the first sludge mixing unit 71 forms a disk as a whole.

The mixing guide plates 71b and 71c are alternately arranged in the one direction and the other direction from the flow guide cylindrical body 50 in the outward direction. That is, the mixing guide plates 71b connecting the one support 71a and the next support 71a are arranged in the same inclination in the same direction, and ascend through the passage 71d therebetween, The sludge in contact with the slurry 71a is caused to flow upward in the inclined direction. In addition, a plurality of mixing guide plates arranged at the same time in the other direction than the one direction are disposed in the mixing guide plate 71c disposed between the supporting tables 71a. Thus, the sludge which is in contact with the ascending and descending through the passage 71d between them is caused to ascend in a direction tilted in the other direction.

These alternating flows in different directions cause the flow of the sludge passing between the plurality of support frames 71a to be mixed with the sloping flow in one direction and the sloping flow in the other direction so that the sludge mixed with the sludge Air bubbles are uniformly and actively brought into contact with each other, and sufficient air is supplied to the aerobic microorganisms contained in the sludge, thereby contributing to decomposition of organic matter and temperature rise of the sludge.

On the other hand, the second bubble jetting nozzles 36 are provided to be inclined upward, and are provided so as to give upward force to the sludge so as to form a spiral locus in which the sludge rises.

Unlike the first bubble jetting nozzle 31, the second bubble jetting nozzle 36 is provided so as to be inclined upward in the upward direction so that air bubbles and sludge, which are injected and flowed from the second bubble jetting nozzle 36, So that the sludge can have some ascending force along the spiral trajectory even after the second sludge mixing means 73 is hit.

6, the second sludge mixing means 73 includes a plurality of nets 73a supported by the inner circumferential surface of the oxidizing bath main body 10 and the flow guiding cylindrical body 50, And includes a plurality of pillars 73b received therein.

As shown in FIGS. 3, 4 and 6, the plurality of the netting bodies 73a are provided with a netting body 73a having an internal space for receiving the pillars 73b, The size of the snow is formed as large as possible so as to smooth the passage of the sludge.

The filler 73b is preferably made of a light synthetic resin material, and its shape can be freely manufactured, but an angular cube or an irregular shape rather than a spherical shape is preferable.

This is because the air bubbles and the sludge flow from the bottom of the net body 73a through the second bubble jetting nozzle 36 to move the plurality of pillars 73b inside the net body 73a when passing through the inside thereof, It is more effective that the shape of the pillar 73b is cubic or irregular since the movement of the pillar 73b is intended to induce a very even mixing of the pillar 73b by disturbing the flow of air bubbles and sludge passing therethrough.

Accordingly, the second bubble spraying nozzle 36 moves bubbles toward the bottom of the net body 73a to move a plurality of the pillars 73b in the inside of the netting 73a, and the motion of the filler 73b Ensures that the air bubbles and sludge passing through are mixed very evenly.

It is preferable that the net body 73a is formed in a box shape having the widest width and the second bubble jetting nozzle 36 is sprayed toward the bottom of the net body 73a so that air bubbles and sludge are advantageously passed through the inside of the net body 73a It is desirable to install it. 3, the supporting member 73c is attached to the oxidation tank main body 10 and the flow guide cylindrical body 50 in an inclined posture so that the bottom surface of the net body 73a can be directed to the second bubble jetting nozzle 36, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the particular embodiments set forth herein. It goes without saying that other modified embodiments are possible.

10; Oxidizing bath main body 20; Sludge advanced means
23; Head tube 24; To sludge supply pipe
25; A spray supply pipe 26; Sludge supply pump
30; Bubble supplying means 31; The first bubble jetting nozzle
36; A second bubble jet nozzle 40; outlet
50; Flow guide cylinder 53; Top
54; Hole 60; The slurry support means
61; Sludge inlet 62; Reflux line
63; Reflux pump 71; The first sludge mixing means
71a; Supports 71b and 71c; Mixed induction plate
71d; A passage 73; The second sludge mixing means
73a; A net 73b; filler
73c; A support member 100; Sludge reservoir
200; Sludge reservoir 210; Primary heat exchanger
230; A secondary heat exchanger 231; Hot water outlet
300; Aerobic oxidation tank 400; Digester
410; A first digester 411; Supply piping
412; Stirring device 413; Gas piping
414; Discharge piping 430; The second digester
500; A gas tank 600; generator
610; Cooling water supply device 630; Hot water supply line

Claims (4)

A primary heat exchanger 210 in which sludge is introduced and heated;
A secondary heat exchanger (230) in which the temperature of the sludge whose temperature rises in the primary heat exchanger (210) flows and is heated;
An aerobic oxidation tank 300 which is supplied with sludge heated in the secondary heat exchanger 230 and oxidatively decomposes organic matter by aerobic microorganisms;
A first digester 410 for receiving and extinguishing sludge oxidatively decomposed by organic matter from the aerobic oxidation tank 300 and supplying sludge to the primary heat exchanger 210;
A second digester (430) for receiving and extinguishing the sludge discharged from the primary heat exchanger (210);
A gas tank 500 for receiving and storing the gas generated in the first digestion tank 410 and the second digestion tank 430;
A generator 600 for generating electric power by a gas supplied from the gas tank 500;
A cooling water supply device (610) for supplying cooling water to the generator (600);
A hot water supply line 630 for introducing the cooling water heated in the generator 600 to the secondary heat exchanger 230 to raise the temperature of the sludge in the secondary heat exchanger 230; And
And a hot water outlet (231) for discharging the cooling water in which the temperature of the sludge is raised by the secondary heat exchanger (230) to utilize it as hot water,
The aerobic oxidation tank (300)
An oxidizing bath main body 10 for containing sludge therein for oxidative decomposition of organic substances in the sludge by aerobic microorganisms,
A sludge supply means (20) for supplying sludge to the oxidation tank main body (10)
Bubble supplying means (30) for supplying air bubbles from the sludge in the oxidation tank main body (10)
An outlet 40 through which the sludge treated by the microorganism is discharged from the oxidation tank main body 10,
And a flow guiding cylinder (50) vertically installed at a central portion in the oxidation tank body (10)
The bubble supplying means (30)
A first bubble spraying nozzle 31 disposed at a periphery of the flow guiding cylindrical body 50 and spaced apart from the flow guiding cylindrical body 50 to horizontally spray bubbles in a single rotational direction about the flow guiding cylindrical body 50; ,
A plurality of bubbles are disposed around the circumference of the oxidation tank main body (10) with a gap therebetween, centering on the flow guiding cylinder (50), and the first bubble spraying nozzle (31) And a second bubble spraying nozzle (36) for spraying bubbles in a direction opposite to the rotating direction by the bubble jetting nozzle (31) The method according to claim 1,
Inside the oxidation tank main body 10,
A first sludge mixing means 71 disposed on the upper side of the first bubble jetting nozzle 31 in a circular plate shape around the flow guide cylindrical body 50 to mix rising sludge,
And a second sludge mixing means (73) installed at a position between the first bubble jetting nozzle (31) and the second bubble jetting nozzle (36) to mix the sludge,
The first sludge mixing means (71)
A plurality of annular support frames 71a concentrically arranged at predetermined intervals around the flow guide cylindrical body 50,
And a plurality of mixing guide plates (71b, 71c) disposed between the plurality of support frames (71a) and connecting the plurality of support frames (71a) to each other,
The mixing guide plates 71b and 71c are alternately arranged in the one direction and the other direction while being outwardly directed from the flow guide cylindrical body 50 so that the flow of the sludge passing between the plurality of supporting frames 71a And the flow is inclined in one direction and inclined in the other direction so as to be manifested in the flow generated by the wastewater sludge treatment 3. The method of claim 2,
The second bubble spray nozzle (36) is provided to be inclined upwardly to give a lift force to the sludge so as to form a helix trajectory in which the sludge rises,
The second sludge mixing means (73)
A plurality of flow channels 73a supported by the flow guiding cylinder 50 and the inner circumferential surface of the oxidation chamber main body 10,
And a plurality of pillars 73b accommodated in the inside of the net body 73a,
The second bubble spray nozzle 36 injects air bubbles toward the bottom of the net body 73a to move a plurality of the pillars 73b inside the net body 73a. Energy generation system delete

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