KR20030018238A - Anaerobic apparatus for fire extinguishing - Google Patents

Abstract

PURPOSE: An anaerobic digestion equipment is provided, which can treat high concentration organic wastewater within a shortened time with improved sludge reduction and utilize the merits of anaerobic digestion equipment of generating methane gas, carbon dioxide, thus preventing any clogging of filtration part. CONSTITUTION: The anaerobic digestion equipment comprises a rotational pipe(16) installed at the substantially center of a main body(11) and is driven by a motor(17) connected to a reducer(14), a connecting pipe of which being connected to the bottom part; an agitation device(18) installed at the bottom of the rotational pipe(16); a distribution pipe(19) installed beneath the agitation device(18) and composed of distribution pipe part(19) connected to the connecting pipe of the rotational pipe(16).

Description

Anaerobic Digestion System {ANAEROBIC APPARATUS FOR FIRE EXTINGUISHING}

The present invention relates to an anaerobic digestion apparatus, and more particularly, to an anaerobic digestion apparatus configured to be used as an energy source by minimizing sludge and generating useful gases such as methane gas by completely decomposing high concentration organic wastewater by anaerobic microorganisms.

In general, as humans began to industrialize, they released pollutants as a benefit. Pollutants are released in various ways depending on the type of industry. As such wastewater is discharged to soil and rivers, river pollution and groundwater pollution become serious and gradually affecting drinking water.

Therefore, the technology for preventing the water pollution has been gradually developed and technological progress has been made to the extent that the wastewater containing low concentrations of pollutants is purified and reused, but the wastewater containing high concentrations of pollutants is separated to the ocean. Secondary pollutants have been mass produced by simply discharging or incineration, and have been treated with aerobic treatment to improve such problems. However, the aerobic treatment has a problem of using enormous facility costs and a large site. .

Therefore, in order to solve this problem, the pollutants were digested by the anaerobic digestion system, but the energy required for the long term residence time of about 20 to 30 days and the heating to maintain the proper temperature of 37 ° C are needed. There was a problem, and nowadays, a high-efficiency anaerobic treatment method has been developed that improves the existing anaerobic digestion system, and thus it is possible to reduce the initial investment cost and operating cost without the need for a large-capacity reaction device like the conventional digestive system. The same anaerobic digester is largely an upflow anerobic sludge-blanket process (hereinafter referred to as UASB) and an egg plate contact media method filled with contact media (hereinafter referred to as MEDIA method). The back is mainly designed, constructed and used.

Anaerobic digestion is defined as the biological oxidation of degradable organic sludge by microorganisms grown in the absence of oxygen under anaerobic conditions. have. In the anaerobic digestion process, the organics of the mixture of primary sedimentation sludge and biological sludge are converted into various end products biologically, including anaerobic methane (CH ₄ ) and carbon dioxide (CO ₂ ), in a gas tight reactor. .

The conventional UASB is composed of a sludge part 1 and a sludge blanket part 2 as shown in FIG. 1, and anaerobic microorganisms are present as granules in the sludge part. It is composed of a separate organic acid tank (3), it is divided into an organic acid reaction tank and a methane reaction tank to decompose organic matter in two stages.

However, the UASB has a number of advantages when treating high concentration organic wastewater compared to aerobic treatment, but the granular sludge portion collapses due to the impact load, which is a fatal defect, resulting in a sludge blanket layer, and the high concentration organic wastewater partly nozzles. As it is supplied by, the flow phenomenon occurs in the vertical direction so that it does not act as an indigestion tank and also receives a very high hydraulic load when it meets the organic load when the concentration of influent is low, resulting in severe sludge loss. do. In addition, it is vulnerable to problems in the production plant or changes in the concentration of water quality of the wastewater, so that the granules are destroyed and lost, and it takes considerable time for normal recovery and treatment. There was a problem in stable operation such as the disturbance, and attention to temperature control (35 ℃ ~ 40 ℃) and pH control, there was a problem to prevent the introduction of toxic substances and to attach various instrumentation equipment.

Another example of the median method is as shown in Figure 2, the medial part 4 and the sludge part 5 is filled with a large egg plate-shaped media inside the fire extinguishing device is configured to the inside of the fire extinguishing device through the distribution pipe from the lower side It is configured to introduce waste water, and it is supposed to cause organic acid and methane reaction in a tank.

However, the media method is easy to be damaged due to the clogging caused by sludge because the media is formed in a large scale in the shape of an egg plate during long-term operation, and is appropriate when the clogging caused by the sludge attached to the media occurs. Since there is no desorption device, the wastewater does not diffuse in the condensed sludge at the bottom and flows only in one vertical direction, and the tunnel flows through only the part of the unobstructed media. The contact of the microorganisms is not smooth, and thus, the deterioration of nitrogen removal efficiency and the wastewater treatment efficiency of the digester occur, which leads to uneconomical problems.

The present invention has been made to solve the problems of the conventional high concentration organic wastewater treatment and anaerobic digestion apparatus for removing nitrogen, to treat the high concentration organic wastewater in a short time, to minimize the generation of sludge and methane gas, carbon dioxide gas, etc. It makes full use of the advantages of anaerobic digester which produces gas (hereinafter referred to as gas), and prevents flow phenomenon in the sludge part of the anaerobic digester and blockage in the filter medium. The purpose is to provide an anaerobic digestion apparatus capable of processing.

In order to achieve the above object, the anaerobic digestion apparatus of the present invention has a high concentration of organic wastewater introduced into a lower portion along a rotating tube rotating at a slow speed from the top, and the organic wastewater of high concentration is evenly sprayed from the distribution pipe to the sludge part. It is supplied to the anaerobic microorganisms that are condensed (scattered down by water pressure), and the stirring device installed on the upper part of the distribution pipe agitates the condensed microorganisms of the sludge part to prevent flow phenomenon and organic matter and microorganisms. Increasing the contact chance of, and when the long-term operation of the microorganisms in the media of the media and overgrowth blockage occurs, the gas stored by the rotating distribution pipe is evenly sprayed to adhere to the media Of the treatment efficiency due to partial blockage of the media It can prevent the cows to reliably and efficiently purify the high concentration of organic wastewater at all times. It is composed of a small cylindrical shape so that the filter medium is not damaged, and the specific surface area is formed wide and each microorganism easily adheres to the surface of each filter medium. The surface of the media is roughly formed.

1 is a schematic configuration diagram of a conventional anaerobic digestion apparatus,

2 is a schematic configuration diagram of a conventional anaerobic digestion apparatus,

Figure 3 is a schematic longitudinal cross-sectional view of the anaerobic digestion apparatus of the present invention,

4 is a schematic cross-sectional view taken along line A-A in a state in which a portion of the filter medium is removed from FIG. 3;

5 is a front view of the media of the present invention,

6 is a side view of the media of the present invention,

7 is an enlarged view of a portion “A” of FIG. 3;

8 is a partially enlarged plan view of a distribution tube of the anaerobic digestion apparatus of the present invention;

9 is a schematic cross-sectional view taken along line B-B of FIG. 3;

10 is a process chart for purifying a high concentration of organic wastewater including the anaerobic digestion apparatus of the present invention.

※ Explanation of symbols for main parts of drawing

11: body 12: sludge part

13: filter medium 13a: upper filter medium prevention member

13b: Lower media separation prevention member 13c: Media

13cb: through hole 13cc: protrusion

14: reducer 15: chain

16: rotating tube 17: motor

18: stirring device 19: distribution pipe portion

19a, 19b, 19c, 19d: distribution pipe 20: water collection tank

21: wastewater pump 23: anaerobic digester

25: surge tank 27: conveying pump

29: gas holder 32: blower

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

3 to 10, the anaerobic digestion apparatus of the present invention is provided with a spherical portion 11a which is an annular body on the upper side of the inside, a cover 11b is formed on the upper side, and the side wall portion 11c and the bottom. A cylindrical main body 11 formed of a portion 11d; A sludge part 12 having a distribution pipe installed in the lower part of the main body 11; A plurality of supports 13aa and upper surfaces of the respective supports 13aa, which are installed on the sludge part 12 and are formed to intersect at right angles to each other and are fixed to an inner circumferential surface of the side wall of the main body 11. The upper media separation prevention member (13a) is installed so that the gold mesh (13ab) is fixed to each other, and a plurality of supports (13ba) is formed so that the outer end is fixed to the inner peripheral surface of the side wall of the main body 11 while being formed to cross perpendicular to each other. In the anaerobic fire extinguishing apparatus is formed with a filter medium 13 filled with a plurality of media between the lower media release prevention member (13b) is installed on the bottom surface of the support 13ba and the gold screen (13bb) is fixed to ,

Chain gear 14a which is provided in the inner central part of the main body 11 while penetrating the central part of the said cover 11b and the medial part 13, and is provided in the reducer 14 provided in the upper surface inner side of the cover 11b. A rotary gear 16a which is connected to the chain 15 by the chain 15 and is rotated by the driving force of the motor 17 installed in the reducer 14;

A stirring device (18) to which one end of each of the four stirring members (18a) (18b) (18c) (18d) are respectively coupled so as to be installed at right angles to the lower portion of the rotary tube (16);

It is provided below each stirring member 18a, 18b, 18c, 18d so that it may correspond with each stirring member 18a, 18b, 18c, 18d of the said stirring apparatus 18, and one end part is closed. Each other end is coupled to the connection tube 16g coupled to the lower end of the rotary tube 16 so as to communicate with the rotary tube 16, and the organic material of high concentration at regular intervals in the horizontal direction at the center of the upper surface Distribution pipe part consisting of distribution pipes 19a, 19b, 19c, and 19d in which a plurality of through holes 19a ', 19b', 19c ', 19d' are formed so that waste water or gas can be injected ( 19);

The filter medium 13c has a plurality of through holes 13cb at regular intervals in the hollow-cylindrical tubular wall 13ca, in which both sides are open so as to be purified while passing the high concentration of organic wastewater with increased microbial contact. The projections 13cc are formed at regular intervals on the outer circumferential surface so that the specific surface area is large. The material of the filter medium 13c is preferably a polypropylene material having high rigidity and toughness, less warpage, good processing stability, rough surface forming, and excellent thermal stability. The stirring device 18 is preferably configured to be coupled to each other at an angle, but may be composed of other members, one end of each stirring member (18a) (18b) (18c) (18d) in the rotary tube (16). It is preferable to weld it. In addition, it is preferable that each distribution pipe 19a, 19b, 19c, 19d, and the rotating pipe 16 are respectively welded to the said connection pipe 16g. The number of installations of the stirring members 18a, 18b, 18c, and 18d and the number of installations of the distribution pipes 19a, 19b, 19c, and 19d can be increased or decreased without limitation. In the drawings, reference numeral 6 denotes a setler, 16b a flange, 16c a bearing, 16d a lidena, 16e a metal box, and 16f an end of each distribution pipe 19a, 19b, 19c, 19d. 16) a turnbuckle that is connected and fixed to it, 36 is a sampling line for checking the contents, and 37 is a rotary joint.

The anaerobic digestion apparatus of the present invention configured as described above treats high concentration organic wastewater as follows.

The high concentration of organic wastewater introduced into the sump 20 is introduced into the anaerobic digester 23 through the wastewater pump 21 and the wastewater inlet pipe 22, and the high concentration of organic wastewater introduced into the anaerobic digester 23 is The anaerobic microorganisms are purified through the sludge part 12 and the filter medium part 13, and the purified water is introduced into the surge tank 25 through the discharge pipe 24 and the surge tank ( Part 25 is sent to the anaerobic digester 23 through the conveying pipe 26 and the conveying pump 27 to increase the treatment efficiency.

The gas generated in the anaerobic digester 23 is collected in the gas holder 29 through the gas discharge pipe 28, and the collected gas is supplied as fuel to the boiler through the boiler induction pipe 30. In addition, some of the gas is used when it is necessary to desorb the sludge attached to each filter medium 13c, and after stopping the supply of the high concentration of organic wastewater to the anaerobic digestion apparatus 23, the gas cleaning pipe ( 31 and through the blower 32 and the rotary tube 16 to the part of the gas from the distribution pipe portion 19 to the filter medium 13 to block each of the through holes (13cb) of each of the filter medium (13c) to blockage After desorbing the excess sludge, it is possible to continue to filter the high concentration of organic wastewater while stopping the gas injection and supplying the wastewater again, and the sludge dropped to the bottom is disposed to the outside through the sludge drawing pipe 33, The above process is automatic.

More specifically, the operation of the present invention will be described. First, the power is turned on to operate the submersible mixer 35, the wastewater pump 21, the motor 17, the transfer pump 27, and the blower 32. The high concentration of organic wastewater introduced into the sump 20 is introduced through the wastewater pump 21 and the wastewater inlet pipe 22 along the rotary tube 16 which is rotated by the motor 17 and the reducer 14. At the same time, the high concentration of organic wastewater is injected into the sludge part 12 in which the anaerobic microorganism inside the anaerobic digester 23 is condensed and multiplied by the distribution pipe part 19, and is sprayed. Each stirring member 18a, 18b, 18c, 18d stirs the sludge portion 12, thereby increasing the organic wastewater and the microorganisms in high concentration, while increasing the organic wastewater in the concentrated sludge portion 12. The flow path phenomenon, which is a phenomenon in which contact between the organic wastewater and microorganisms of high concentration is not properly made by flow in only one vertical direction without diffusion, is suppressed.

Anaerobic microorganisms proliferating in the anaerobic digestion system (23) to multiply by using the high concentration of the introduced organic matter as a food to produce a gas such as methane (CH ₄ ), carbon dioxide (CO ₂ ). same.

In this way, wastewater containing high concentrations of organic matter is mostly converted into methane gas, carbon dioxide, hydrogen sulfide, and water, and some of them are multiplied by microbial cells. It has excellent processing capacity and generates useful energy such as methane gas.

The purified water is sent to the surge tank 25 through the discharge pipe 24, where it is transferred to the next process through the treated water pipe 34, and some of the water is returned through the transfer pump 27 and the transfer pipe 26 again. It is sent to the anaerobic digester 23 to improve the purification efficiency of high concentration organic wastewater.

In addition, the generated gas is collected in the gas holder 29 through the gas discharge pipe 28 and transferred to the boiler induction pipe 30 to be used as an alternative energy source, a part of the gas collected in the gas holder 29 is anaerobic digestion When the sludge excessively propagates in the filter medium 13 installed inside the apparatus 23, a blower 32 and a rotary tube used as a gas for detaching the excessively grown sludge and operated with the gas cleaning tube 31 are provided. The gas is evenly injected as it rotates through (16) and rotates through the plurality of through holes 19a ', 19b', 19c ', 19d' in each of the distribution pipes 19a, 19b, 19c, and 19d. Excessive propagation of the filter medium 13 causes the sludge that has blocked the filter medium 13c to be reasonably detached, and the detached sludge can be removed to the outside through the sludge discharge pipe 33 underneath. As a result of the test, the cleaning period of the filter unit 13 should be performed once every two to three months.

Therefore, by controlling the amount of microorganisms living in the filter medium 13, a decrease in the treatment efficiency of the high concentration organic matter wastewater due to blockage is prevented. In order to examine the results of treating the wastewater by the anaerobic digestion apparatus of the present invention operating as described above and the existing UASB or activated sludge method, each embodiment applied to high concentration organic wastewater of different properties is as follows.

First, Table 1 shows the results of treating high concentrations of benzene compounds by the anaerobic digester, UASB and activated sludge process of the present invention.

(Table 1) Comparative table at the time of high concentration benzene compound treatment

Table 1 shows the treatment results when the benzene compound was treated by the anaerobic digestion apparatus, the UASB extinguishing apparatus, and the activated sludge process of the present invention. The lower the load, the higher the treatment efficiency. This low efficiency is not effective, and the treatment efficiency by the anaerobic digestion apparatus of the present invention was about 5 to 9% higher than that of the conventional UASB, which is an anaerobic treatment method. It can be seen that. The above experimental conditions are the result of experiments on wastewater inflow, digester volume, aeration tank volume, temperature, microbial volume, etc. when the CODcr volume load is 1kg, 2kg, 3kg, and COD using K ₂ Cr ₂ O ₇ Dichromic acid Chemical Oxygen Demand is shown. In addition, Table 2 shows the results of treating the landfill leachate by the anaerobic digester and UASB of the present invention as follows.

(Table 2) Comparison table at the time of landfill leachate treatment

division Invention U A S B Load (CODcr kg / ㎥ .D) 1.5 3 1.5 3 Inflow CODcr (mg / 1) Inflow Total Nitrogen (mg / 1) 115002500 Outflow CODcr (mg / 1) outflow total nitrogen (mg / 1) 3850680 4100870 3980850 47601020 CODcr removal efficiency (%) Total nitrogen removal efficiency (%) 66.572..8 64.365.2 65.466 58.659.2

Table 2 shows the treatment results when the landfill leachate was treated with the anaerobic digester of the present invention and the existing UASB extinguishing system, and the treatment efficiency by the anaerobic digester of the present invention was better than that of the existing UASB digester. .

Currently, the landfill leachate is not subjected to anaerobic treatment and is only subjected to aerobic treatment. Experimental conditions are the same as in Table 1.

In addition, Table 3 shows the results of treatment of livestock wastewater by the anaerobic digester and UASB of the present invention as follows.

(Table 3) Comparison table at the time of livestock wastewater treatment

division Invention U A S B CODcr Load (CODcr kg / ㎥.D) 2 3 2 3 Inflow CODcr (mg / 1) Inflow Total Nitrogen (mg / 1) 380003500 - - - Outflow CODcr (mg / 1) outflow total nitrogen (mg / 1) 2600945 37001085 42001050 56001240 CODcr removal efficiency (%) Total nitrogen removal efficiency (%) 93.2% 73% 90.2% 69% 88.9% 70% 85.2% 64.6%

Table 3 shows the treatment results when the animal wastewater was treated using the anaerobic digestion apparatus of the present invention and the existing UASB extinguishing system, and the treatment efficiency by the anaerobic digestion apparatus of the present invention was 4% higher than that of the existing UASB. The experimental conditions are the same as in Table 1. In addition, Table 4 shows the treatment results of the anaerobic digestion apparatus and aerobic treatment of the leachate in the composting facility as follows.

(Table 4) Comparison table at the time of leachate treatment of composting facility

division Invention Aerobic treatment Wastewater CODmn (mg / 1) Wastewater SS (mg / 1) 1700002500 - Treated Water CODmm (mg / 1) Treated Water SS (mg / 1) 4800450 COD removal efficiency (%) SS removal efficiency (%) 97.2% 82% Treatable COD Load (kg COD / m ³ .D) 8.5 0.5 Necessary reaction Digester 100m ³ Aeration tank 1700m ³ Required power 3HP 150 HP Sludge generation amount 21.3Kg DS / D 425Kg DS / D Soi Lot 20 pyeong 140 pyeong

Table 4 shows the results of treating the leachate generated during the composting of the internal sludge produced from slaughter wastewater and the surplus sludge of the activated sludge using the anaerobic digestion apparatus of the present invention. Compared with the treatment, the site area, power cost, sludge treatment cost, construction cost, etc. are significantly reduced, so that the high concentration organic wastewater treatment using the anaerobic digestion apparatus of the present invention is compared with the high concentration organic wastewater treatment by the conventional aerobic treatment. Operational management costs are incomparably economical, and no special driving skills are required.

The experimental conditions are the same as in Table 1.

As described above, the anaerobic digestion apparatus of the present invention is superior to the conventional UASB anaerobic digestion apparatus, and has a superior efficiency of high concentration organic wastewater treatment, superior nitrogen removal efficiency, and long-term operation. The problem of the conventional anaerobic digestion apparatus, which was degraded in the high concentration of organic wastewater treatment due to the tunnel phenomenon in the filter medium and the sludge excessively attached to each filter 13c of each filter unit 13, was solved. As the specific surface area is broadly formed so that the efficiency of the high concentration organic wastewater treatment is good, the microorganisms are excessively multiplied in the filter part 13 while maximizing the advantage of the filter medium having the surface roughly formed so that many microorganisms adhere. In addition, the above-mentioned microorganisms can be reasonably detached and processed so that stable operation can be performed with constant efficiency at all times. There is an effect.

Claims (5)

A cylindrical main body 11 having an annular body 11a provided at an upper side thereof and a lid 11b formed at an upper end thereof; A sludge part 12 having a distribution pipe having a through hole formed in a transverse direction at regular intervals in a lower portion of the main body 11; It is installed on the sludge part 12 and the upper media release prevention member (13a) consisting of a plurality of supports (13aa) and the gold net (13ab) and the lower media separation prevention prevention consisting of a plurality of supports (13ba) and the gold net (13bb) In the anaerobic digestion apparatus formed of the filter medium portion 13 filled with a plurality of filter mediums between the members 13b, It is installed in the inner center of the main body 11 while penetrating the center part of the medial part 13 in which the said cover 11b and the filter medium 13c are filled, and are installed in the reducer 14 provided in the upper surface inner side of the cover 11b. A chain gear 16a connected to the chain gear 14a, which is connected by the chain 15, is installed and rotated by the driving force of the motor 17 installed in the reducer 14, and the connecting pipe 16g is disposed at the lower portion thereof. A rotary tube 16 coupled thereto; A stirring device 18 installed below the rotary tube 16; It is installed under the stirring device 18, characterized in that consisting of the distribution pipe 19 is connected in communication with the connecting pipe (16g) of the rotary tube 16 so that a high concentration of organic wastewater or gas can be injected. Anaerobic digester. The anaerobic digestion according to claim 1, wherein the stirring device (18) is welded to one end of each stirring member (18a) (18b) (18c) (18d) at a lower portion of the rotary tube (16). Device. The distribution pipe part (19) according to claim 1, wherein one end portion of each of the distribution pipe parts (19a) (19b) is closed so as to correspond to the stirring members (18a) (18b) (18c) (18d) of the respective stirring devices (18). And the other end of each of (19c) and (19d) is welded to each connection part of the connection pipe (16g) of the rotary tube 16, respectively, and the upper surface of each distribution pipe (19a) Anaerobic digestion apparatus characterized in that a plurality of through-holes (19a ') (19b') (19c ') (19d') is formed in the transverse direction at regular intervals. According to claim 1, The filter medium (13c) has a plurality of through holes (13cb) are formed at regular intervals in the hollow-cylindrical cylindrical wall (13ca) formed so that both sides are open, the interior is a space portion and the specific surface area is large, the outer peripheral surface Anaerobic digestion apparatus, characterized in that the protrusions (13cc) are formed at regular intervals. The anaerobic digester according to claim 1, wherein the material of the filter medium (13c) is polypropylene.