WO2014021599A1

WO2014021599A1 - Digester apparatus

Info

Publication number: WO2014021599A1
Application number: PCT/KR2013/006807
Authority: WO
Inventors: 장희현
Original assignee: Jang Hee Hyun
Priority date: 2012-07-31
Filing date: 2013-07-30
Publication date: 2014-02-06
Also published as: KR20140016697A; KR101503116B1

Abstract

The present invention relates to a digester in which a supply of nutrients to microorganisms is accelerated and the formation of a layer of scum or a layer of sedimentation of suspended matter is suppressed in the digester such that a decrease in the effective volume of the digester is prevented and the treatment efficiency of the digester can be increased at low cost. According to the present invention, a digester (1) includes: an inlet pipe (4) which is sealed from outside air, inhabited by anaerobic microorganisms, and into which waste water flows; and a discharge pipe (5) from which the waste water flowing in is biologically treated and discharged. Provided is the digester that further includes: a plurality of hopper units (6) which are arranged on a bottom surface (2) within the digester (1) and the circumferential portions of which are interconnected such that a floor surface is divided into a plurality of cells; a digestion gas pipe (12) in which an intake inlet (13) is open at an upper end of the digester (1), an air pump (14) is connected to the middle, and a discharge port (15) is open to a lower end portion of each of the hopper units (6); and an air lift pipe (16), the lower end (17) of which is formed from an upwardly extending tubular body which is adjacent to the discharge port (15) of the digestion gas pipe (12) and into which the discharged digestion gas flows.

Description

Digester

The present invention relates to a digester, and more particularly, to promote nutrition of microorganisms in an anaerobic microbial reaction tank and to suppress the formation of scum layers or suspended solids deposits in the digester to prevent a reduction in the effective volume of the digester, thereby reducing the cost. The present invention relates to a digester apparatus of a new structure that can increase the treatment efficiency of a digester.

In general, a large amount of organic substances are contained in drinking water, manure or sewage, and a digester is used as a wastewater treatment apparatus for biological treatment in an anaerobic sealed atmosphere. However, these digesters are arranged in multiple stages, and anaerobic microorganisms live in the state where the inflow of external air is completely blocked, and the wastewater flows in such a way that the organic matter contained in the wastewater is first biologically decomposed and then transferred to an adjacent digester to be decomposed again. The process is repeated. In addition, such digesters have good biodegradation when microorganisms and organics are in smooth contact with each other. For this purpose, it is necessary to stir the microorganisms in contact with the introduced wastewater or sludge. However, such a conventional digester consists of a large tank whose diameter or height is several tens of meters, and thus the maintenance cost increases due to high power consumption when a large impeller is used to stir a large amount of wastewater or sludge contained in such a large tank. In addition, the stirring efficiency also does not meet expectations. In addition, there is also a method of injecting digestive gas into the digestive fluid to cause circulation, but it is difficult to effectively circulate a large amount of digestive fluid contained in a large tank.

On the other hand, since the temperature in the conventional digester stays at room temperature in nature, the digestive fluid in the digester is lower than around 36 degrees, which is a temperature suitable for the bioreaction of anaerobic microorganisms, so that a heating device of the digester is required for a smooth biological reaction. The device has a problem that the construction and maintenance is cumbersome due to the complicated structure.

In addition, the conventional digester is arranged in multiple stages, when the digester or sludge is pumped and transported to the digester of the next stage adjacent to the previous digester, the microbial colony is destroyed and this colony takes a considerable time to reduce the digestion efficiency. There was a problem.

The present invention is to solve the problems of the conventional digester as described above, the present invention is effective in suppressing the formation of scum layer or sedimentation layer in the digester in which wastewater is biologically treated and nutrition for anaerobic microorganisms at low maintenance cost It is to provide a digester device that can effectively agitate the extinguishing fluid or sludge to promote and increase the extinguishing efficiency.

In another aspect, the present invention is to provide a new digester apparatus that can maintain the digestion liquid in the digester at an appropriate temperature without occupying a separate space. In another aspect, the present invention is to provide a digester apparatus of a new structure that can transfer the digestive fluid and sludge or the microbial colony from the previous digester to the next digestion tank without destroying the microbial colony without the use of power to reduce maintenance costs.

According to one feature of the invention, the digester (1) is connected to the inlet pipe (4), which is sealed from the outside air, inhabit anaerobic microorganisms, and the wastewater from the outside and the discharge pipe (5) from which the introduced wastewater is biologically treated and discharged. In the digester apparatus comprising a plurality of hoppers 6 and the circumferential portions are arranged on the inner bottom surface (2) of the digester (1) and connected to each other to divide the bottom surface into a plurality of cells, the digester (1) of The inlet 13 is opened at the upper end, the air pump 14 is connected to the middle and the extinguishing gas pipe 12 and the discharge port 15 is opened at the lower end of each hopper 6, and the lower end 17 is the extinguishing Extinguishing gas discharged in close proximity to the discharge port (15) of the gas pipe 12 is provided with a digester apparatus comprising an air lift pipe (16) made of a tube extending upwardly.

According to another feature of the invention, the digester (1) is formed in a cylindrical shape, the hopper portion 6 is provided with a digester device characterized in that the digester bottom surface (2) to be concentrically and radially partitioned.

According to another feature of the invention, the hopper 6 of the digester 1 is installed on the bottom 2 of the digester 1, the space 7 formed between the bottom 2 and the hopper 6 ) Is provided with a digester device, characterized in that the heat medium 26 is filled and the heat exchanger 24 is installed.

According to another feature of the invention, at least a portion of the plurality of hoppers 6 of the digester 1 is provided with a second extinguishing gas pipe 32 in parallel with the extinguishing gas pipe 12, the second extinguishing gas pipe Extinguishing gas discharged in close proximity to the discharge port (35) of the 32 is provided with a digester tank characterized in that the digestion liquid transfer pipe 38 is further provided to be connected to the extinguishing tank 1B of the next stage adjacent.

According to the present invention, a plurality of hoppers 6 having a circumferential portion connected to each other so as to divide the bottom surface into a plurality of cells is formed on the bottom of the digestion tank 1 in which anaerobic microorganisms inhabit and inflow of wastewater is biologically treated. In the hopper part 6, an inlet 13 is opened at the upper end of the digester 1, and a extinguishing gas pipe 12 is provided at the lower end of the hopper 6 at which the discharge port 15 is opened. By including the air lift pipe 16 into which the extinguishing gas discharged from the inlet flows, the bottom surface of the digester 1 having a relatively large size is provided in the digester 1 through a plurality of hoppers 6 partitioned into a plurality of cells. The sludge is dropped by self weight and collected, and the collected sludge is raised by an upward flow generated by the rise of the digestion gas in the digestion tank 1, thereby maintaining the anaerobic atmosphere without introducing an external air, while stirring the digestive liquid. It is possible to stir or circulate the sludge evenly and vigorously in a large area of the digester 1 without the need for a separate large impeller or a large capacity pump for digestion fluid circulation. In addition, when the digester 1 has a cylindrical shape, the cell of the bottom surface is divided in a concentric circle and a radial direction so that the size and shape of the hopper part 6 constituting the unit cell can be generally uniformly manufactured without a large difference. It is possible to make the production easy and uniform stirring operation.

In addition, when the recessed space 7 is formed between the hopper part 6 and the bottom face 2 of the digester 1, water or other heat medium is put into this space, and the several heat exchanger 24 is By installing, the digester 1 can be heated or cooled to a temperature suitable for bioreaction without taking up a separate space, and the wastewater treatment performance can be further improved.

In the case where the digester 1 is arranged in multiple stages, at least a part of the hoppers 6 is provided with a second digested gas pipe 32 in parallel with the digested gas pipe 12 to raise the digested gas. Digestion liquid transfer pipe 38 is provided to connect the extinguishing gas rising to the adjacent next digestion tank (1B) to minimize digestion and destroy the digestive fluid and sludge or microbial colony without destroying the microbial colony. It can be transferred to the digester, it is possible to achieve a digester with excellent extinguishing efficiency while maintaining the continuity of the system. In addition, since the gas supplied for the digestion liquid transfer is also introduced by the digestion gas of the next stage digester to be transported and is carried out by airlift, the optimum conditions are maintained without disturbing the microbial environment suitable for each digester stage. This allows for more efficient microbial treatment.

1 is a schematic configuration diagram of an embodiment of the present invention

Figure 2 is a schematic plan view showing the arrangement of the hopper portion of the present invention

3 is a view showing a digestive fluid delivery mechanism of the present invention

4 is an enlarged view of a portion A of FIG.

Hereinafter, with reference to the drawings will be described a preferred embodiment of the present invention. 1 is a schematic configuration diagram of an embodiment of the present invention, Figure 2 is a schematic plan view showing the structure of the cell of the embodiment, Figures 3 and 4 is a conceptual diagram showing a digestive fluid delivery mechanism of the present invention. As shown, according to the present invention, there is provided a digester apparatus including a digester 1 sealed from outside air and inhabiting anaerobic microorganisms. The digester 1 is connected to an inlet pipe 4 through which wastewater or digestion fluid is introduced from an extinguishing tank of an external or previous stage, and a discharge pipe 5 through which the treated wastewater or digestion solution is discharged. The digester 1 is relatively large in size and reaches a diameter or height of several tens to several tens of meters. Preferably such digester 1 is made of a cylindrical shape having a flat bottom face 2. And the bottom 2 of the digester 1 is divided into a plurality of cells. Specifically, a plurality of hoppers 6 having inclined surfaces in the form of cones or pyramids are arranged on the bottom face 2 of the digester 1. By this hopper part 6, the bottom face of the digester 1 arrange | positions the recessed groove which has many inclination parts uniformly. This hopper part 6 manufactures the bottom face 2 of the digester 1 to an equal area or a standardized form as much as possible. In the case where the digester 1 is cylindrical, as shown in FIG. 2, the cell formed by the hopper part 6 is divided into concentric and radial directions so as to be manufactured in several equivalent shapes and standards so as to be the hopper part 6. It is easy to manufacture, but to enable an even stirring action throughout the digester (1). The sludge, suspended matter, and the like suspended in the digestion liquid are gradually collected by the hopper part 6 and collected along the inclined surface of each hopper part 6 to the concave lower end of the center part.

On the other hand, the upper end of the digester (1), the inlet 13 of the digestion gas pipe 12 is open on the water surface of the digestive fluid, the inhalation of anaerobic digestion gas in the upper part of the digester (1) through the air pump 14 to each hopper portion ( Extinguishing gas is discharged through the discharge port 15 disposed at the concave lower end of 6). In addition, an air lift tube 16 is disposed to catch and introduce the extinguishing gas discharged by being disposed close to the upper portion of the discharge port 15 of the extinguishing gas tube 12. At the upper end of the air lift pipe 16, a porous plate or diffuser 19 for dispersing the rising sludge is disposed. Accordingly, as the digested gas discharged from the discharge port 15 of the digestive gas pipe 12 rises in the form of bubbles through the air lift pipe 16, sludge or other precipitates collected in the hopper part 6 are formed by the rising airflow. It floats to the upper part of the digester 1 along the upward flow and circulates. In addition, the falling flow is formed between the rising flow and the rise and fall of the digestive fluid occurs in the position evenly distributed in the digester 1 as a whole, the sludge or sediment is disturbed or stirred, thereby preventing the formation of scum layer or sedimentary layer. And the contact between anaerobic microorganisms and sludge is increased or maintained at a high level, thereby increasing the biological treatment efficiency.

In addition, a space 7 in which a plurality of recesses communicate with each other is formed between the bottom face 2 of the digester 1 and the plurality of hopper portions 6. This space 7 is filled with water or other suitable heat medium, and a plurality of heat exchangers 24 are provided therein. The heat exchanger 24 is preferably a hot water radiator for heating the digestion liquid in the digestion tank 1 to a temperature suitable for the reaction of anaerobic microorganisms, but in some cases, a heat exchanger capable of cooling the temperature of the digestion liquid may be used. Of course. A tropical air flow blocking plate 25 is spaced apart from the lower part of the heat exchanger 24, which suppresses unnecessary convection of the water heated by the heat exchanger 24 and heats the upper hopper 6 more efficiently. It is to make it possible.

On the other hand, according to the present invention, at least some of the plurality of hopper parts 6, for example, any one hopper part 6, is provided with a second extinguishing gas pipe 32 in parallel with the extinguishing gas pipe 12. The extinguishing gas pipe 32 has a suction end 34 disposed above the extinguishing tank 1B of the next stage adjacent to the extinguishing gas supplied from the extinguishing tank 1B of the next stage through the second extinguishing gas pipe 32. The hopper 6 is discharged to the lower end. The suction end of the extinguishing liquid conveying pipe 38 is disposed at an upper position near the discharge port 35 of the extinguishing gas pipe 32, and the extinguishing liquid conveying pipe 38 is introduced into an adjacent extinguishing tank 1B. Feed and supply digestive fluid. By introducing the digestion gas of the digestion tank 1B of the next stage through the second digestion gas pipe 32 as described above and transferring the digestion liquid to the digester 1 of the next stage by the air lift, It is not necessary to use, and it is possible to achieve an efficient digester with low maintenance costs by preventing time from creating a suitable microbial environment when destroying a microbial colony transported when using a pump. In addition, since the gas supplied for the digestion liquid transfer is also introduced by the digestion gas of the next stage digester to be transported and is carried out by airlift, the optimum conditions are maintained without disturbing the microbial environment suitable for each digester stage. This allows for more efficient microbial treatment.

Claims

In the digester device comprising a digester (1) which is sealed from the outside air, inhabit anaerobic microorganisms, and the inlet pipe (4) through which the wastewater flows from the outside and the discharge pipe (5) through which the inflowed wastewater is biologically treated and discharged. A plurality of hoppers 6 disposed on the inner bottom surface 2 of the digester 1 and having a circumferential portion connected to each other so as to divide the bottom surface into a plurality of cells, and an inlet 13 is opened at an upper end of the digester 1. And an air pump 14 connected to the middle, and an extinguishing gas pipe 12 having an outlet 15 opened at a lower end of each hopper part 6, and a lower end 17 of which is an outlet 15 of the extinguishing gas pipe 12. Fire extinguisher device characterized in that it comprises an air lift pipe (16) made of a tubular body is introduced into the extinguishing gas discharged in proximity to the).
2. The digester apparatus according to claim 1, wherein the digester (1) is formed in a cylindrical shape, and the hopper portion (6) divides the digester bottom face (2) concentrically and radially.
The hopper part 6 of the said digester 1 is provided in the bottom face 2 of the digester 1, and is the recessed space between the bottom face 2 and the hopper part 6. The digester device (7), characterized in that the heat medium (26) is filled and the heat exchanger (24) is installed.
The second extinguishing gas pipe (32) according to claim 1 or 2, wherein at least a part of the hoppers (6) of the digester (1) is provided with a second extinguishing gas pipe (32) in parallel with the extinguishing gas pipe (12). A digester apparatus further comprising a digestive liquid conveying pipe (38) further connected to the extinguishing tank (1B) of the next stage in which the extinguished gas discharged in close proximity to the discharge port (35) of the digestive gas pipe (32) flows in.