KR101813894B1

KR101813894B1 - An Advanced System for Treating Sewage Using a Structure of High Speed Organic Acid Fermentation and a Method Using the Same

Info

Publication number: KR101813894B1
Application number: KR1020150135126A
Authority: KR
Inventors: 김영준; 조경철
Original assignee: (주)태승기업
Priority date: 2015-09-24
Filing date: 2015-09-24
Publication date: 2018-01-02
Also published as: KR20170036226A

Abstract

The present invention relates to an advanced sewage treatment system for an evaporated and condensed organic acid producing structure and a sewage treatment method therefor, and more particularly, to a sewage treatment plant for converting organic matters contained in sewage, food waste or animal wastes into organic acids, To an elevated sewage treatment system of an evaporated and condensed organic acid producing structure for improving the treatment efficiency, and a sewage treatment method therefor. The advanced sewage treatment system of the evaporated and condensed organic acid producing structure includes a primary settling tank A12 into which sewage or wastewater flows, an anoxic tank A141 connected to the primary settling tank A12, a secondary settler A15 connected to the anoxic tank A141, An organic acid fermentation tank A13 for fermenting an organic acid from at least a part of the organic matter flowing into the primary clarifier A12, and a condensing tank A151 connected to the secondary settling tank A15; And a condensation unit (A131) for condensing and storing the gaseous organic acid generated in the organic acid fermentation tank (A13), wherein the gas or heat not condensed in the condensation process is circulated to the organic acid fermentation tank (A13) The organic acid condensed in the condensing tank (A131) is introduced into the anoxic tank (A141).

Description

TECHNICAL FIELD [0001] The present invention relates to an advanced sewage treatment system for an evaporation and condensation organic acid producing structure and a sewage treatment method therefor,

The present invention relates to an advanced sewage treatment system for an evaporated and condensed organic acid producing structure and a sewage treatment method therefor, and more particularly, to a sewage treatment plant for converting organic matters contained in sewage, food waste or animal wastes into organic acids, To an elevated sewage treatment system of an evaporated and condensed organic acid producing structure for improving the treatment efficiency, and a sewage treatment method therefor.

As the population increases and the industrialization progresses, the demand of water resources is increasing, and prevention of water pollution by various pollutants is becoming a major problem.

For example, as the industrialization progresses, the amount of nitrogen or phosphorus generated increases, and prevention of eutrophication of rivers due to the increase of nitrogen or phosphorus becomes a problem of environmental management. In order to remove nitrogen and phosphorus which cause eutrophication, a sewage treatment system having a conventional organic matter treatment structure has been converted to an advanced sewage treatment system. However, if the incoming sewage has a low organic load, the removal efficiency of nitrogen and phosphorus is significantly lowered, and an external carbon source should be injected additionally to compensate. Various techniques for solving such problems are known in the art.

Japanese Patent Application Laid-Open No. 10-2005-0006347 discloses an anaerobic microorganism which releases phosphorus in microbial cells in an anaerobic state by mixing effluent water from a primary clarifier with an organic substance contained in influent water and mixing with a carrier sludge solid- article; A denitrification tank for reducing nitrate nitrogen of the effluent discharged from the anaerobic tank to nitrogen gas; Aeration tank for nitrification of the effluent of the denitrification tank; First conveying means for conveying the inner sludge containing nitrate nitrogen of high concentration produced in the aeration tank to the denitrification tank; A second settler that receives effluent discharged from the aeration tank and performs solid-liquid separation, and discharges sludge in a low-concentration sludge to the outside; Second conveying means for conveying sludge having a high concentration among the sludge solid-liquid separated from the secondary settler to the anaerobic tank; A concentrated tank in which excess sludge is provided for disposal in the sludge solid-liquid separated from the secondary settler; A plurality of thermal oxidation reactors for decomposing and oxidizing the surplus sludge provided from the concentrating tank into a liquid state; Catalyst injection and recovery means for injecting and recovering a catalyst into the thermal oxidation reactor; Heating and pressurizing control means for controlling the thermal oxidation reactor to be maintained at a predetermined pressure and temperature; Heating means for heating the thermal oxidation reactor to a predetermined temperature; Oxidant supply means for supplying an oxidant to the thermal oxidation reactor so as to oxidize the sludge contained in the thermal oxidation reactor; A heat exchange means for cooling and heating the high temperature product of the thermal oxidation reactor and the low temperature concentrated sludge supplied to the thermal oxidation reactor by heat exchange; And an accumulation tank for supplying the organic acid generated in the thermal oxidation reactor to the denitrification tank and discharging the byproducts generated in the reaction process to the lower part.

Patent Publication No. 10-2014-0061873 discloses an initial sedimentation tank which precipitates and removes suspended solids having a small specific gravity among the sewage having passed through the sediments; A bioreactor for biologically treating the sewage having passed through the first settling tank in the order of anaerobic zone and aerobic zone together with anaerobic zone; A microbial feeder for feeding a useful microorganism into the tank to ferment food leach water in the tank to produce organic acid; and a microbial feeder for feeding the organic acid produced in the tank to the bioreactor And a controller for controlling the organic acid supply unit to supply the organic acid in the tank to the bioreactor when the BOD of the sewage flowing into the first settling tank is less than a predetermined value. And a final sedimentation tank for sedimenting and removing the sludge generated through the bioreactor, and returning the return water containing a part of the sludge to the bioreactor.

The sewage treatment technique disclosed in the prior art discloses a method of fermenting an organic material to produce an organic acid to be introduced into an anaerobic region in order to increase removal efficiency of nitrogen and phosphorus. However, it has a structure in which an organic acid is generated from an organic matter treated first, or an organic acid separately generated is added. Therefore, there is a problem that the organic acid is not easily generated at a high speed or the treatment facility due to the supply of organic leachate must be made independently. It is advantageous that the organic material for organic acid production is obtained from the inflow sewage and can remove the odor or other contaminants generated during the treatment of the organic acid. The prior art does not disclose such a process or method.

The present invention has been made to solve the problems of the prior art and has the following purpose.

Prior Art 1: Patent Publication No. 10-2005-0006347 (published by Korea Institute of Construction Technology, Jan. 17, 2005) Advanced sewage treatment system and advanced sewage treatment method using organic acid produced from sewage sludge Prior art 2: Patent Publication No. 10-2014-0061873 (Dream ENG Co., Ltd., published May 22, 2014) Organic acid production apparatus using food leachate and useful microorganisms and sewage treatment apparatus containing the same

The object of the present invention is to provide a high-speed organic acid treatment structure capable of generating organic acids from sludge generated at a high concentration of organic wastes introduced into a sewage treatment plant and a sludge generated at a treatment plant, while at the same time treating odors and pollutants generated during the production of organic acids And an object of the present invention is to provide an advanced wastewater treatment system of evaporated and condensed organic acid producing structure and a sewage treatment method therefor.

According to a preferred embodiment of the present invention, an advanced wastewater treatment system of an evaporated and condensed organic acid generating structure is connected to a primary settling tank into which sewage or wastewater flows, an anoxic tank connected to the primary settling tank, a secondary settler connected to the anoxic tank and a secondary settler An organic acid fermentation tank made of a thickener and fermenting an organic acid from at least a part of the organic material flowing into the primary settling basin; And a condensation unit for condensing and storing the gaseous organic acid generated in the organic acid fermentation tank. The gas or heat not condensed in the condensation process is circulated to the organic acid fermentation tank, and the organic acid condensed in the organic acid condensation tank is introduced into the anoxic tank do.

According to another preferred embodiment of the present invention, the organic acid fermentation tank comprises: a fermentation tank for fermenting the organic material; A filter unit for removing dust from the gaseous organic acid produced in the fermentation tank; A deodorizing device for removing odor from the non-condensed gas; And a membrane unit for separating moisture from the condensed organic acid.

According to another preferred embodiment of the present invention, the organic acid fermentation tank comprises an acid fermentation tank for producing an organic acid from a high concentration of organic acid; An evaporation tank for converting the organic acid generated from the acid fermentation tank to a gaseous state; A cooling condenser for condensing the gas in the evaporator; And a condensed water tank for storing the condensed organic acid generated in the cooling tank. The gaseous organic acid generated in the evaporation tank is supplied to the condensate tank through the condensation heat exchanger, and the residual gas of the condensed heat exchanger is supplied to the cooling condensation tank To the condensate tank.

According to another preferred embodiment of the present invention, an advanced sewage treatment method using an evaporating and condensing organic acid generating structure comprises: separating organic matter from the incoming sewage; Converting the separated organic material into an organic acid; The organic acid is evaporated and transferred to a condensing tank to be condensed water; A step of storing the condensed water and supplying heat generated in the process of converting the condensed water to the organic acid during the conversion of the organic acid; Charging the stored condensed water into an anoxic tank; Separating at least a portion of the organic sludge produced by the treatment in the anoxic tank; Storing and treating the organic sludge; And introducing the treated organic sludge into the organic acid conversion process.

The high-level wastewater treatment system according to the present invention allows the organic acid to be generated from the organic wastes or sludge introduced into or generated in the wastewater treatment plant, thereby improving the treatment efficiency and enhancing the process economy. It also reduces processing costs compared to using methanol as an external organic carbon source. The method of the present invention for treating sewage sludge comprises converting the primary sludge and the secondary sludge into organic acids for use during the treatment process, thereby reducing the sludge generation amount and reducing the sludge treatment cost. Also, by allowing organic wastes to be treated separately, pollutant emissions from sewage treatment plants can be reduced. In addition, it is possible to effectively treat the wastes generated in the related industries by linkage of organic wastes having high processing costs such as food wastewater and livestock manure.

1 shows an embodiment of an advanced sewage treatment system of an evaporative and condensed organic acid producing structure according to the present invention.
2 shows an embodiment of the evaporative and condensed organic acid generating structure according to the present invention.
3 shows another embodiment of the evaporative and condensed organic acid generating structure according to the present invention.
4 shows an embodiment of a sewage treatment method based on the evaporated and condensed organic acid producing structure according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so that they will not be described repeatedly unless necessary for an understanding of the invention, and the known components will be briefly described or omitted. However, It should not be understood as being excluded from the embodiment of Fig.

1 shows an embodiment of an advanced sewage treatment system of an evaporative and condensed organic acid producing structure according to the present invention.

1, an advanced sewage treatment system according to the present invention includes a primary settler A12 into which sewage or wastewater flows, an anoxic tank A141 connected to a primary settler A12, a secondary settler connected to an anoxic tank A141, An organic acid fermentation tank A13 for fermenting an organic acid from at least a part of the organic matter flowing into the primary clarifier A12, and a thickener A151 connected to the primary clarifier A15 and the secondary clarifier A15; And a condensation unit (A131) for condensing and storing the gaseous organic acid generated in the organic acid fermentation tank (A13), wherein the gas or heat not condensed in the condensation process is circulated to the organic acid fermentation tank (A13) The organic acid condensed in the condensing tank (A131) is introduced into the anoxic tank (A141).

The advanced wastewater treatment system according to the present invention can be applied to any wastewater treatment process such as general wastewater treatment, food wastewater treatment or livestock wastewater treatment. Separation, clarification, filtration, pumps, or transfer devices generally applicable for sewage treatment can be applied to the system according to the present invention. Although not specifically described herein with respect to such devices, this is intended to be a brief description and a clear understanding of the present invention and should not be construed thereby as limiting the invention.

The sewage containing the organic matter can be introduced into the inflow pump station A11 through the gypsum, and the suspended solids contained in the sewage or the solid-like material having a large size can be removed by a sprinkler or a screen. And the sewage can be transferred from the inflow pump station A11 to the primary settler A12. The sewage transferred to the primary clarifier A12 may contain, for example, 60 to 75 wt.% Organic matter. The organic matter contained in the sewage can be separated by an appropriate separation device and transferred to the organic acid fermentation tank A13. The separating device can be provided, for example, in the primary clarifier A12 and can be made in a structure that removes water from the sewage transferred to the primary clarifier A12. For example, the separation device may include a pair of gear pumps installed inside the closed housing connected to the organic acid fermentation tank A13. When a part of the sewage is transferred through the pair of gear pumps, the water content is reduced, and the organic matter can be transferred to the organic acid fermentation tank A13. Organic acid can be produced by fermentation in the organic acid fermentation tank (A13). The organic acid fermented in the organic acid fermentation tank A13 may be in a gaseous form and the organic acid fermentation tank A13 may be maintained at a temperature such that the fermented organic acid is in a gaseous form. Or a gas generating unit for converting an organic acid into a gas. The gaseous organic acid can be transferred to the condensing unit A 131 and condensed, and the condensed organic acid can be transferred to the anoxic tank A 141. The organic acid supplied as an external carbon source to the anoxic tank (A141) can be used in the denitrification process in the treatment of sewage. In the organic acid fermentation tank A13, for example, the organic material may be fermented at a high temperature of 80 to 110 DEG C, and dust removal and deodorization processes may be performed during distillation and condensation. Such a process may be carried out under a reduced-pressure hermetic condition of, for example, 0.3 to 1.0 atm.

The amount of organic acid introduced into the anaerobic tank A141 may be determined by ORP (Oxidation Reduction Potential).

The sewage having undergone the denitrification process can be transferred to the secondary settler (A15) through the anaerobic tank (A142). The organic sludge generated in the secondary settling tank A15 may be separately stored. Alternatively, the organic sludge may be selectively introduced into the organic acid fermentation tank A13. The organic material sludge can be treated through the thickening tank A 151, the digester tank A 152, and the dehydration tank A 153. Further, the sewage whose organic sludge has been removed can be discharged through the filtration and disinfection apparatus A16. As described above, the advanced sewage treatment system according to the present invention reduces the sewage treatment cost by using an alcohol such as methanol as an external organic carbon supply source by converting the organic matter of the primary clarifier A12 into organic acid and using it as a carbon source . It can also reduce emissions of pollutants in the entire sewage treatment system.

In the system according to the present invention, the food wastes or the livestock manure may flow into the organic acid fermentation tank A13 through the path independent of the sewage. Alternatively, food wastes or livestock fodder may be separated and introduced into the organic acid fermentation tank A13 during the inflow process. The organic material introduced into the organic acid fermentation tank (A13) by the same method as the yeast can be fermented into organic acid, and may be introduced into the anaerobic tank (A141) through evaporation and condensation.

Hereinafter, the treatment process of the organic material charged into the organic acid fermentation tank A13 will be described.

2 shows an embodiment of the evaporative and condensed organic acid generating structure according to the present invention.

2, the organic acid fermentation tank A13 includes a fermentation tank 21 for fermenting organic matter; A filter unit (23) for removing dust from the gaseous organic acid produced in the fermentation tank (21); A deodorizing device (25) for removing the odor from the non-condensed gas; And a membrane unit 28 for separating moisture from the condensed organic acid.

The fermentation tank 21 can separate organic substances from the primary clarifier and ferment organic materials to produce organic acids. The fermentation tank 21 may include a device for determining fermentation conditions such as a pressure regulating unit PR, a temperature regulating unit TR and a humidity regulating unit HR. The operation of the pressure regulating unit PR, the temperature regulating unit TR and the humidity regulating unit HR can be controlled by the control panel C. The inside of the fermentation tank 21 may be adjusted to a temperature of 85 to 110 DEG C and a pressure of 0.3 to 1.0 atm depending on the amount of organic matter or the amount of water contained in the organic matter. Organic acids such as methanol or ethanol produced in the fermentation process of organic matter can be made into gasses. Alternatively, the organic acid can be evaporated and formed into a gas. And to the cyclone unit 22 for removing dust from the gas. Then, the dust can be removed from the cyclone 22 and transferred to the filter unit 23. The filter unit 23 may be provided with temperature control means. In order to prevent the organic acid from being deposited, the filter unit 23 can be kept in a reduced pressure state, for example, while being kept at the evaporation temperature of the organic acid, and can be connected to the condensation tank 24 through a plurality of tubules. And the condensation tank 24 can be maintained at a relatively high pressure and the organic acid from which dust has passed through a plurality of tubules is easily condensed. And the liquid organic acid condensed in the condensing tank 24 may be stored in the condensate tank 26. [ The condensate tank 26 may be maintained at a low temperature or a high pressure in a closed configuration and may be maintained at a temperature of, for example, -5 to 15 DEG C or a pressure of 1.5 to 5 atm. As a result, the deformation of the organic acid can be prevented, and the precipitation of impurities contained in the organic acid can be induced. In the process of condensing the gaseous organic acid in the condensing tank 24, the non-condensed organic acid may be transferred to the fermentation tank 21 by the circulation unit 241. The organic acid in the gaseous state by the control valve 242 can be discharged to the outside through the deodorizing device 25 in order to keep the pressure inside the fermentation tank 21 constant in the circulation unit 241. [ The condensed organic acid generated in the deodorization process may be collected in the auxiliary tank 251 and supplied to the purifier 27 as described below.

The condensed organic acid stored in the condensate tank 26 can be transferred to the purifier 27 having the impurity removing filter such as activated carbon through the circulating pump 261 to remove the impurities. And water can be separated through the membrane unit 28 to produce a high concentration organic acid. The resulting high concentration organic acid may then be added in an appropriate amount based on the ORP of the anoxic tank and used as a carbon source. As described above, the system according to the present invention generates organic acids from the organic substances contained in sewage, evaporates and condenses them while purifying them, and allows the high-concentration organic acids produced by the purification to enter the anoxic tank. The heat generated in the condensation process of the organic acid or the heat generated in the fermentation tank 21 can be used as an energy source for the process progress according to the design structure.

3 shows another embodiment of the evaporative and condensed organic acid generating structure according to the present invention.

Referring to FIG. 3, the organic acid fermentation tank A13 includes an acid fermentation tank 211 for producing an organic acid from a high concentration organic acid; An evaporation tank 212 for converting the organic acid generated from the acid fermentation tank 211 into a gaseous state; A reaction tank 24 for condensing the gas of the evaporation tank 212; And a condensate tank 26 for storing the condensed organic acid produced in the condensation tank 24 and the gaseous organic acid generated in the evaporation tank 212 is passed through the condensation heat exchanger 34 to the condensate tank 26 And the remaining gas of the condensing heat exchanger 34 can be supplied to the condensate tank 26 through the condensing tank 24. [

The fermentation tank 21 may include an acid fermentation tank 211 for fermenting the organic material into an organic acid and an evaporation tank 212 for evaporating the organic acid generated in the acid fermentation tank 211. The temperature of the acid fermentation tank 211 can be maintained at a temperature of 30 to 40 ° C in the mesophilic process and at a temperature of 50 to 60 ° C in the high-temperature extinguishing process. The organic matter flowing into the acid fermentation tank 211 may be an organic matter separated from the primary settling basin, food waste or livestock manure that is separated and introduced in the sewage treatment plant in advance. As described above, such organic matter can be appropriately regulated as the water is transferred through the gear pump. In the acid fermentation tank 211, a liquid organic acid may be produced, and the generated organic acid may be collected separately and transferred to the evaporation tank 212 by the feed pump P1.

The evaporation tank 212 may have a function of removing impurities while converting the liquid organic acid into a gaseous form. For example, the evaporation tank 212 can be maintained at a temperature of 65 to 100 DEG C and a pressure of 0.3 to 1.0 atm, although the internal condition of the evaporation tank 212 can be determined depending on the kind of the organic acid generated. The gaseous organic acid generated in the evaporation tank 212 may be supplied to the filter unit 23 which removes dust by a conveying means such as a compression pump 231. [ The gaseous organic acid supplied to the filter unit 23 can be transferred to the condensation tank 24 and condensed to be stored in the condensate tank 26. And then the organic acid in the liquid state and the non-condensed organic acid in the condensation tank 24 may be treated in a manner similar to that described in the illustrated embodiment of FIG.

At least a portion of the heat for maintaining the temperature of the acid fermentation tank 211 may be supplied by heat exchange for the gaseous organic acid produced in the evaporator. Specifically, the condensation heat exchanger 34 can be connected to the filter 23. The heat exchange medium of the condensation heat exchanger 34 can circulate between the acid fermentation tank 211 and the condensation heat exchanger 34 by the circulation pump P2 and supply at least a part of the heat required in the acid fermentation tank 211 . The condensed organic acid in the condensation heat exchanger (34) can be transferred to the condensate tank (26) by a heat exchange process. And the unconcentrated organic acid can be transferred to the condensing tank 24 via the recovery heat exchanger 31 and condensed and transferred to the condensate tank 26. The recovered heat exchanger 31 is installed to collect heat in the process of conveying the uncondensed organic acid in the condensing tank 24 to the evaporation tank 212. If the unconcentrated organic acid is discharged to the outside through the control valve 242 or directly to the evaporation tank 212, there is no need to install the recovered heat exchanger 31 separately. Therefore, the recovery heat exchanger 31 can be selectively installed according to the design structure.

In this way, the heat generated during the production, evaporation and condensation of the organic acid in the advanced wastewater treatment system according to the present invention can be effectively utilized by the heat exchange method, thereby reducing the operating cost of the entire system.

An example of how the sewage is treated in such an elevated sewage treatment system is described below.

4 shows an embodiment of a sewage treatment method based on the evaporated and condensed organic acid producing structure according to the present invention.

Referring to FIG. 4, an advanced sewage treatment method using an evaporative and condensed organic acid generating structure according to the present invention comprises the steps of: (P41) separating organic matter from inflow sewage; Converting the separated organic material to an organic acid (P42); (P43) in which the organic acid is evaporated and transferred to a condensing tank to become condensed water; (P431) the heat generated in the process of storing the condensed water and becoming the condensed water is supplied in the organic acid conversion process; (P44) the stored condensed water is introduced into the anoxic tank; Separating at least a portion of the organic sludge that has been treated and processed in the anoxic tank (P45); Storing and treating the organic sludge (P46); And introducing the treated organic sludge into the organic acid conversion process.

The organic matter can be separated in the primary sedimentation tank, the organic matter can be separated, the moisture can be controlled, and it can be converted into the organic acid by the fermentation tank (P42). In the fermentation tank, the organic acid can be produced in a liquid state and can be transferred to the evaporation tank by appropriate transport means. And may be transferred to the condensation tank after being made gas in the evaporator (P43). Through such evaporation and condensation processes, the impurities contained in the organic acid are removed, and thereby, a high purity organic acid can be produced. The heat released to the outside in the course of evaporation and condensation can be recovered through heat exchange and fed to, for example, a fermenter (P431). The stored condensed organic acid can then be purified and put into an anoxic tank (P44).

According to the present invention, the organic sludge generated in the secondary settling tank can be introduced into the fermentation tank as needed. The organic sludge from the secondary clarifier can be separated by an appropriate method (P45) and stored and treated to regulate moisture (P46). Depending on the content of organic matter, it can be judged whether it is appropriate to the input conditions (P47). The organic matter generated in the secondary clarifier can be selectively introduced into the fermenter according to the design structure.

In the sewage treatment system according to the present invention, organic matter can be treated in various ways and injected in the sewage treatment process, and the present invention is not limited to the embodiments shown.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention . The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

21: Fermenter 22: Cyclone unit
23: filter unit 24: condensing tank
25: deodorizing device 26: condensate tank
27: Purifier 28: Membrane unit
31: recovered heat exchanger 34: condensed heat exchanger
211: acid fermentation tank 212: evaporation tank
231: Compression pump 241: Circulation unit
242: control valve 261: circulation pump
251: auxiliary tank 261: circulation pump
A11: Inflow pump station A12: Primary clarifier
A13: Organic acid fermentation tank A15: Second settling tank
A16: Filtration and disinfection device A131: Condensation unit
A141: Anoxic tank A142: Anaerobic tank
A151: Enrichment tank A152: Digester
A153: Dewatering tank C: Control panel
HR: Humidity control unit P1: Feed pump
P2: circulation pump PR: pressure control unit
TR: Temperature control unit

Claims

The first settling tank A12 into which sewage or wastewater flows is connected to an anoxic tank A141 connected to the first settling tank A12, a second settler A15 connected to the anoxic tank A141 and a condenser A151 connected to the second settler A15 In the sewage treatment system of the present invention,
An organic acid fermentation tank A13 for fermenting an organic acid from at least a part of the organic matter flowing into the primary clarifier A12; And
And a condensation unit (A131) for condensing and storing the gaseous organic acid generated in the organic acid fermentation tank (A13)
The gas or heat not condensed in the condensing process is circulated to the organic acid fermentation tank A13, and the organic acid condensed in the condensing unit A131 is introduced into the anoxic tank A141,
The organic acid fermentation tank A13 comprises an acid fermentation tank 211 for producing organic acids from a high concentration organic acid; An evaporation tank 212 for converting the organic acid generated from the acid fermentation tank 211 into a gaseous state; A cooling fluid reservoir (24) for condensing the gas of the evaporation tank (212); And a condensate water tank 26 for storing the condensed organic acid generated in the cooling water tank 24. The gaseous organic acid generated in the evaporation tank 212 is passed through the condensation heat exchanger 34, (26) and the residual gas of the condensing heat exchanger (34) is supplied to the condensate tank (26) through the cooling condensing tank (24).

The organic acid fermenter (A13) according to claim 1, wherein the organic acid fermenter (A13) comprises: a fermenter (21) for fermenting the organic material; A filter unit (23) for removing dust from the gaseous organic acid produced in the fermentation tank (21); A deodorizing device (25) for removing odor from the non-condensed gas; And a membrane unit (28) for separating moisture from the condensed organic acid. &Lt; Desc / Clms Page number 19 >

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