KR100949396B1 - Anaerobic decomposition chamber for combustible gas production with organic waste and sewage sludge - Google Patents

Abstract

PURPOSE: An anaerobic decomposition device for producing gas fuel from sewage sludge and organic waste is provided to produce gas fuel by decomposing the sewage sludge and the organic waste with residual inorganic materials under semi-dry anaerobic conditions. CONSTITUTION: An anaerobic decomposition device for producing gas fuel from sewage sludge and organic waste includes a decomposition chamber(10) successively laminating soil, an organic waste, sewage sludge, and gas collecting part(30) producing gas fuel by using the decomposition reaction of sewage sludge and organic waste. The gas collecting part includes a gas collecting pipe, a collecting protection pipe, a filling stand, and a collecting supporting pipe(34). The collecting supporting pipe is connected to the outer circumference of the collecting protection pipe.

Description

Semi-Aerobic Decomposition Chamber for Combustible Gas Production with Organic Waste and Sewage Sludge

The present invention relates to a decomposition apparatus for the energy and environmental resources of organic waste and sewage sludge, more specifically, to produce a gas fuel containing a high concentration of methane gas by decomposition of organic waste and sewage sludge under semi-dry anaerobic conditions, By using the stabilized inorganic material remaining after the end of the gas fuel production as cover material, it is possible to use the waste as energy and environmental resources without causing secondary environmental pollution problem in treating organic waste and sewage sludge.

The largest amount of organic waste in the country is biodegradable waste, which is more than 11,000 tons per day, and spends more than 400 billion won every year for its disposal. Nevertheless, the disposal of organic wastes creates new environmental pollution and national health threats, requiring new technologies for organic waste disposal, namely, environmentally friendly and low-cost treatment technologies.

Semi-drying organic fertilizer production technology is used as food waste recycling technology, which performs pretreatment of collected and transported food waste, and then adds salt-free biodegradable material to reduce the salt concentration of food waste. Whilst indoors or outdoors. Analytical biodegradation of the food waste to which the biodegradable substance is added causes methane gas to be discharged into the atmosphere and used as an organic fertilizer.

The salinity of the organic fertilizer produced is lowered in proportion to the amount of biodegradable substances added, but since the total salt content in the organic fertilizer is constant, the use of farmland in these organic fertilizers increases the salt content in the soil, causing ecological changes in the soil, and growing crops. Problems such as hindering the appearance of such.

In the dry treatment, odor is generated due to the material composition and collection characteristics of food waste, and methane gas of low concentration is rapidly diffused directly into the atmosphere, and thus it is technically difficult to treat the odor and methane gas known as global warming gas.

As a food waste recycling technology, automated wet treatment technology has been applied in Europe for over 40 years. The above technology puts biodegradable wastes such as food waste into the tank and performs gravity sorting to separate foreign substances having a heavier density than water, and then transfer the biodegradable wastes from which the foreign substances are separated to the fermenter to increase the concentration of solids by 12%. It is a technique of collecting gas fuel containing a high concentration of methane gas by diluting to a degree and maintaining biodegradation while maintaining a constant temperature. When the produced methane gas concentration is lowered below a certain level, the decomposition reaction is stopped and the residue is separated into a solid phase and a filtrate, the filtrate is transferred to a wastewater treatment plant, and the solid phase is dehydrated and matured to be converted into organic fertilizer.

For the automated wet treatment technology, expensive facilities such as sorting, fermentation tank, dehydration, pre-treatment of pre-treatment, after-treatment, and deodorization equipment should be installed, and it is not economical because the heat treatment of the fermentation tank for methane production must be maintained. In addition, ripening treatment is a problem that the site for food waste is 100 tons / day, when de-ripening because aquatic is about 50 tons / day of the subject being treated to produce ripening process, so must last at least 90 days more than required is 15,000m ² have.

Most of the dewatered sewage sludge discharged from domestic sewage treatment plants is treated by ocean dumping. However, in accordance with the International Convention on the Prohibition of Ocean Dumping, since 2012, the domestic dumping of domestic sewage sludge is banned. Therefore, incineration of sewage sludge is used instead of ocean dumping. Since the incineration treatment can treat sewage sludge in large quantities and recover heat energy, the technology has been commercialized in advanced countries for a long time, but the incineration treatment is installed at incinerators, incineration air pollutants, and at least 75% in sewage sludge. There is a huge cost for auxiliary fuel supply and combustion ash treatment for evaporation of the contained moisture. If the organic matter contained in the sewage sludge can be removed 7.5 ~ 12%, the sewage sludge is a simple waste and can be treated in a more economical and environmentally friendly way.

In the treatment of organic waste and sewage sludge, the method of mixing organic waste and sewage sludge and storing them in the decomposition chamber is very different in terms of density, viscosity and composition of food waste and sewage sludge. In addition, since the odor intensity generated during the mixing operation is more than 5, which is the highest value, there is a problem that a huge cost and high technology are required for the installation and operation of the deodorization facility for odor treatment.

In order to overcome the above problems, when the soil, organic waste and sewage sludge are deposited in the decomposition chamber, water of organic waste is absorbed into the soil, so that the decomposition reaction easily occurs in the organic waste, and the sewage sludge having a dense structure is formed. The present invention has been completed by focusing on preventing odors generated from organic wastes from leaking out during the decomposition reaction.

The present invention has a technical problem in producing gas fuel containing high concentration of methane gas at low cost throughout the year by decomposing organic waste and sewage sludge under semi-dry anaerobic conditions.

In addition, the present invention has a technical problem of using the stabilizing inorganic material remaining after the end of the production of gas fuel as sanitary landfill cover material.

The present invention is a means for solving the above problems, the decomposition chamber is installed as an underground structure in order to use geothermal heat as a heat source for the decomposition of biodegradable waste, the soil, organic waste and sewage sludge in the decomposition chamber sequentially The present invention provides a device for decomposing organic waste and sewage sludge, wherein a gas collecting unit for collecting gaseous fuel generated by the decomposition reaction of the organic waste and sewage sludge is installed inside a decomposition chamber.

As another means for solving the above problems, the present invention provides a method for producing gaseous fuel using an apparatus for decomposing organic waste and sewage sludge.

As another means for solving the above problems, the present invention provides a method of using a stabilized inorganic material remaining in the decomposition chamber as a cover material after gas fuel generation is completed.

The present invention has the effect of treating the organic waste and sewage sludge with low cost environmentally friendly technology, which causes secondary environmental pollution problems while being treated at high cost.

In addition, the present invention has the effect of using waste as an energy source by converting a biodegradable material into a gas fuel containing more than 50% methane gas throughout the year.

In addition, the present invention has the effect of using the entire organic waste and sewage sludge as energy and environmental resources by stabilizing the inorganic material containing biodegradable material to be used as cover material.

In the present invention, the soil, organic waste and sewage sludge are sequentially stratified in the decomposition chamber, and a gas collecting unit for collecting the gaseous fuel generated by the decomposition reaction of the organic waste and sewage sludge under semi-dry anaerobic conditions is inside the decomposition chamber. It provides a decomposing device of organic waste and sewage sludge installed in the plant.

Here, the semi-dry anaerobic condition refers to a condition in which organic waste, sewage sludge, and decomposed reactions are performed only by their own moisture contained in the soil, and there is no inflow of external air.

Specifically, the decomposition apparatus of the organic waste and sewage sludge according to the present invention is a decomposition chamber, a gas collection unit in the form of a tube extending in the longitudinal direction installed in the interior of the decomposition chamber, an airtight cover and sealing to block the decomposition chamber and the outside It may include a microbial filter connected to the cover.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the following description is only for explaining the present invention specifically, and is not limited to the scope of the present invention by the following description.

1 is a process chart showing a process for producing gaseous fuel and sanitary landfill cover by stratifying soil, organic waste and sewage sludge according to the present invention, FIG. 2 is a configuration diagram of a decomposition apparatus according to the present invention, and FIG. 4 is a perspective view illustrating a gas collecting unit of the decomposition apparatus according to the present invention, FIG. 5 is a sectional view showing a sealing cover of the decomposition apparatus according to the present invention, and FIG. Figure 7 is a cross-sectional view showing a microbial filter of the decomposition apparatus according to the present invention, Figure 7 is a block diagram showing a cover material regeneration apparatus of the decomposition apparatus according to the present invention, Figure 8 is a gas fuel generated from the mixture of organic waste and sewage sludge and organic waste and sewage sludge It is a graph showing the concentration of methane in.

As shown in Figure 1 to 8, the organic waste and sewage sludge decomposition apparatus according to the present invention is the soil, organic waste and sewage sludge is laminated in the decomposition chamber, the decomposition of the organic waste and sewage sludge under semi-dry anaerobic conditions The gas collecting unit for collecting the gas fuel produced by the reaction is configured to be installed inside the decomposition chamber.

The decomposition chamber 10 according to the present invention is to provide a place for storing and decomposing and stabilizing the organic waste 16 and sewage sludge 17, and the geothermal and organic waste 16 and the sewage sludge 17 The heat of decomposition by the self-decomposition reaction is used to continue the generation of gaseous fuel of the organic waste 16 and the sewage sludge 17. The decomposition chamber 10 is composed of an underground structure in order to use geothermal and is preferably installed in the landfill end landfill or operating landfill.

Specifically, the decomposition chamber 10 according to the present invention is a waterproof membrane 11 is installed on the side and the lower portion of the interior of the decomposition chamber 10, the upper portion of the waterproof membrane 11 installed under the decomposition chamber 10. The leachate collection pipe 12 installed in the ground and the groundwater collecting box 21 is installed on the lower outer side of the waterproof membrane 11 installed in the decomposition chamber 10 may be further included.

The waterproof membrane 11 is installed at the lower side and the side of the decomposition chamber 10. It does not specifically limit as a material which comprises the said waterproof film 11, It is preferable to use a high density polyethylene. The waterproof membrane 11 prevents groundwater and surface water from entering the decomposition chamber.

The leachate collection pipe 12 is installed on an upper portion of the waterproof membrane 11 installed below the decomposition chamber 10. The leachate collection tube 12 is configured in the form of a tube extending in the longitudinal direction, the outer peripheral surface is formed with a plurality of holes. The leachate collection pipe 12 collects leachate, which may be generated in a small amount in the decomposition reaction under semi-dry anaerobic conditions, and then supplies the leachate to the top of the decomposition chamber to recycle the entire leachate.

When the leachate collection pipe 12 is installed, the drainage layer 13 and the nonwoven film 14 may be additionally installed. The drainage gravel layer 13 is installed on the periphery of the leachate collection pipe 12, that is, on the upper, lower, and side surfaces of the leachate collection pipe 12. The leachate collection pipe 12 forms a gravel or the like of a suitable standard to prevent a phenomenon in which a hole formed in the outer circumferential surface of the leachate collection pipe 12 is blocked.

By installing the nonwoven fabric layer 14 on the drainage gravel layer 13, only the leachate generated in the decomposition chamber 10 passes through the nonwoven fabric having excellent water permeability and flows into the leachate collection pipe 12.

The groundwater collecting box 21 is installed at the outer lower end of the waterproof membrane 11 installed at the lower part of the decomposition chamber 10, and is preferably installed at the outer lower end of the central portion of the waterproof membrane 11. The groundwater collecting box 21 is installed in the lower part of the groundwater outflow pipe 23 is connected, the upper portion is connected to the vertical drainage pipe 24 of the tubular shape extending in the longitudinal direction.

The groundwater collection box 21 has a plurality of holes in which groundwater flows in, so that groundwater or surface water that may be generated outside the decomposition chamber 10 is easily introduced into the groundwater collection box 21.

In addition, an anti-blocking gravel layer 22 is further provided on the side of the hole formed in the groundwater collecting box 21 to prevent the hole formed in the groundwater collecting box 21 from being blocked. Groundwater and surface water collected in the groundwater collection box 21 may be discharged to the outside through the groundwater outlet pipe 23 installed at the lower portion.

Specifically, the rainwater drainage port 43 for collecting rainwater and the like may be additionally installed at the edge of the decomposition chamber 10. The rainwater drain port 43 is a ditch.

Gas collecting unit 30 according to the present invention is to collect the gas fuel generated after the stratification, if the gas collecting unit 30 for this purpose is not particularly limited, but preferably a plurality of holes formed on the outer peripheral surface Tubular gas collecting tube; A collecting protection tube surrounding the outer circumferential surface of the gas collecting tube and having a plurality of holes formed on the outer circumferential surface; and a filling station formed between the gas collecting tube and the collecting protecting tube.

The gas collecting part 30 is provided above the nonwoven film 14 formed in the decomposition chamber 10, and is preferably provided at a height of 500 mm or more from the nonwoven film 14. By installing the gas collecting unit 30 at a height of 500 mm or more from the nonwoven fabric 14, it is minimized that water generation and temperature change appearing in the lower part of the decomposition chamber 10 due to leachate affect the gas collecting unit 30. can do.

In addition, the gas collecting unit 30 is installed when stacking the food waste 16 in the decomposition chamber 10, so that all the stacking work is completed after the excavation work to install the gas collecting unit 30 in the upper portion of the stratification Difficult to perform, that is, the unstable stratification due to the weight of the excavating equipment is settled to solve the problem of difficult work.

The gas collecting tube 31 is configured in the form of a tube extending in the longitudinal direction, and a plurality of holes are formed in the outer circumferential surface. Although the material of the gas collection tube 31 is not specifically limited, It is preferable that it consists of polyethylene. The gas collecting pipe 31 serves to collect gaseous fuel generated in the decomposition chamber 10.

The collection protection tube 32 is configured in the form of a tube extending in the longitudinal direction to surround the outer circumferential surface of the gas collection pipe 31 on the outside of the gas collection pipe 31, a plurality of holes are formed on the outer peripheral surface of the collection protection tube 32 It is. Although the material of the collection protection tube 32 is not specifically limited, It is preferable that it is polyethylene. The collection protection tube 32 serves to protect the gas collection tube 31.

The filling table 33 is provided between the gas collecting tube 31 and the collecting protection tube 32. The filling table 33 maintains the shape and function of the collection protection tube 32, and prevents the stratified waste from entering the gas collection pipe (31). The constituent material for forming the filling table 33 is not particularly limited but is preferably wood chips. The filling table 33 facilitates passage of the gas fuel generated while reducing the weight of the gas collecting unit 30.

The gas collecting unit 30 may be connected to the outer circumferential surface of the collecting protection tube 32 of the tubular collecting auxiliary pipe 34 having a plurality of holes formed on the outer circumferential surface for smooth movement of the generated gas raw material.

The collecting auxiliary pipe 34 is configured in the form of a tube extending in the longitudinal direction, one end of the collecting auxiliary pipe 34 is installed to be attached to the outer peripheral surface of the collecting protection tube (32). At this time, the collecting auxiliary pipe 34 is connected to the outer circumferential surface of the collecting protection tube 32 by a rubber belt (35). The outer circumferential surface of the collection auxiliary pipe 34 is formed with a plurality of holes. Although the material of the said collection auxiliary pipe 34 is not specifically limited, It is preferable that it is polyethylene.

The collection auxiliary pipe 34 is preferably the upper end is connected to the bottom height of the upper soil (15). In addition, the lower end of the collecting auxiliary pipe (34) is connected to the drainage gravel layer (13), is bent from the decomposition chamber side is connected to the drainage gravel layer (13) along the decomposition chamber side. Preferably, it is bent at the decomposition chamber side of the sewage sludge 17 side stacked on the lower side is preferably connected to the drainage layer 13 along the decomposition chamber side. The lower end of the collection auxiliary pipe 34 is connected to the drainage gravel layer 13, so that the generated leachate is easily moved to the leachate collection pipe 12, and after the generation of the leachate is completed, the gas is moved. It is easy. At this time, the number of installation of the collecting auxiliary pipe 34 is not particularly limited, but it is preferable that a plurality of radiators are installed downward.

The collection auxiliary pipe 34 is an early bottom outflow of the leachate generated during the initial stratification, the gas fuel generated from the stratified stabilizer to move quickly to the gas collection pipe 31, microorganisms by contacting the organic waste and sewage sludge Structural function to improve the habitat rate and serves to support the gas collection unit 30 is moved to the lower due to the settlement of the stratification generated as the biodegradation proceeds.

Gas transfer pipe 37 is configured in the form of a tube extending in the longitudinal direction is connected to the upper portion of the gas collecting pipe (31). The gas transfer pipe 37 is configured in the horizontal direction. The gaseous fuel collected by the gas collecting tube 31 is discharged to the outside through the gas transfer pipe 37.

The control valve 36 is installed at the lower end of the connecting portion of the gas collecting pipe 31 and the gas transfer pipe 37 and serves to adjust the flow rate and concentration of the gas fuel.

The ratio of the volume of the soil (15), organic waste (16) and sewage sludge (17) constituting the stratification according to the present invention is preferably 0.5 to 1.5: 1.5 to 4.5: 0.5 to 1.5, 1: 1: 1: It is more preferable that is.

If the soil layer volume ratio is lower than the ratio, the amount of dehydration in the organic waste 16 layer is lowered, so that the concentration of methane gas is lowered, the amount of methane gas is reduced, and the amount of leachate is increased. If the volume ratio of the sewage sludge 17 is lower than the ratio, there is a problem that the outflow of the generated odor is increased. In addition, when the volume ratio of the soil 15 and sewage sludge 17 are both higher than the above ratio, the volume ratio of the organic waste 16 is relatively low, resulting in a decrease in the total amount of methane gas generated.

As shown in FIG. 3, in the decomposition chamber 10, the strata including the soil 15, the organic waste 16, and the sewage sludge 17 may be stratified at least twice. At this time, the number of times of stratification is not particularly limited, but in order to maintain the concentration and amount of the generated methane gas, it is preferable to stratify 10 to 30 times.

By treating the stratification including the soil 15, the organic waste 16 and the sewage sludge 17 more than once in the decomposition chamber 10, the leachate of the organic waste is generated by the load. It flows down into the leachate collection pipe 12 in the chamber 10, and it collects and stores water, and supplies it to the upper part of the decomposition chamber 10 and recycles it.

In a stratified layer including the soil 15, the organic waste 16 and the sewage sludge 17, the upper surface of the sewage sludge 17 is inclined. It is preferable that the said inclination is 5/100 or more. By inclining the stratified layer, it is possible to easily drain the generated leachate.

Herein, the organic waste 16 constituting the strata refers to food waste, animal waste, or manure, and may be used by mixing one or more kinds of food waste, animal meal, or manure.

The organic waste 16 is preferably used in combination with wood chips. The amount of water in the organic waste 16 is 70% or more.

The pulverized powder or phosphate manure maintains a carbon: nitrogen ratio at a suitable ratio for the growth of off-white material upon decomposition to promote the production of high concentration methane gas. Herein, the ratio of carbon: nitrogen necessary for microbial propagation is 30: 1 to 25: 1. If the composition ratio of plants in food waste is excessively high, the carbon: nitrogen ratio will be low. Therefore, it is better to adjust the carbon: nitrogen ratio to the above ratio by adding condensate or phosphorus manure.

The soil 15 absorbs the moisture of the organic waste 16 stratified on the top to promote the leachate flow while maintaining the moisture content of the organic waste 16 at around 50% suitable for anaerobic decomposition. In addition, the leachate has a function of outflow passage of gas generated during semi-dry anaerobic decomposition.

Sewage sludge (17) is an organic-containing waste having a water content of about 75% that has been subjected to some degree of biodegradation in the domestic sewage treatment plant. Therefore, when a biodegradable substance is added, such as organic waste (16), the sewage sludge (17) can continue. Biodegradation is promoted to promote gasification of residual organics.

Since the sewage sludge 17 has a compact structure, the sewage sludge 17 blocks the external leakage of odor generated from the organic waste 16 stratified below. In addition, since the sewage sludge 17 has an impermeability of about 10 ^-5 cm / sec, the organic waste generation leachate reaching the soil 15 having a porosity of about 40% at the top prevents the sewage from moving downward. It promotes semi-dry anaerobic decomposition of organic waste 16 stratified under sludge 17. The leachate flows laterally along the upper surface of the sewage sludge 17 and passes through the collection auxiliary pipe 34 to the drained gravel layer 13 at the bottom of the decomposition chamber.

Decomposition device according to the invention may further include a sealing cover (40). The sealing cover 40 is to prevent the outflow of odor generated during the stratification and / or after completion of the stratification, and to exclude rain water falling to the decomposition chamber 10, etc. in the art for this purpose The sealing cover 40 is not particularly limited as long as it is commonly used, but preferably includes a film 41.

The sealing cover 40 is installed on the upper part of the decomposition chamber 10 to block the decomposition chamber 10 from the outside. The sealing cover 40 is made of a prefabricated structure, the skeleton is preferably made of a prefabricated steel structure.

The membrane 41 is overlaid on a skeleton made of a prefabricated structure. The membrane 41 is configured to have an inclination toward the edge around the decomposition chamber 10. The inclination of the membrane 41 is preferably 30/100 or more for the movement of the retention odor and the lower flow of the generated condensate.

The film 41 is preferably made of a material of low density component, more preferably of polyethylene of low density.

The sealing cover 40 according to the present invention may include a condensate collector 42 and a sealed door 44.

The condensate collection receiver 42 is installed at the end of the inclined surface inside the membrane 41. The condensate collection receiver 42 collects the condensed water stuck to the inner side of the membrane. The end of the membrane is installed to be placed inside the rainwater drain 43, the condensate collected in the condensate receiving 42 is moved to the rainwater drain 43.

Sealing door 44 is installed at the center of the side of the sealing cover (40). The sealed door 44 is preferably provided in the center two sides. The soil 15, the organic waste 16, and the sewage sludge 17 are transferred into the decomposition chamber 10 through the sealed door 44.

Microbial filter 50 of the present invention is connected to the sealing cover 40. The microbial filter 50 is to treat the odor transported from the airtight cover 40, if the microbial filter 50 commonly used in the art for this purpose is not particularly limited, preferably odor inlet ( 51), the filter layer 53 is connected to the odor inlet 51 and the discharge port 55 is connected to the end of the filter layer 53.

Odor inlet 51 is configured in the form of a tube extending in the longitudinal direction, is connected to the pipe 46 is installed on the upper portion of the sealing cover (40). Here, the pipe 46 is installed in a tubular shape on one side of the membrane 41 of the sealing cover 40.

The odor inlet 51 may be further installed to control the odor inlet flow control valve 52 to control the amount of odor transported.

The filter layer 53 is connected to the odor inlet 51, and the material of the filter layer 53 is not particularly limited, but it is preferable to fill the wood chips. Here, the wood chips are incubated with desulfurization bacteria.

The odor flow guide plate 54 may be further installed in the filter layer 53 to uniformly move the odor and to extend the residence time of the odor.

The odor flow guide plate 54 is formed in a plate shape and is installed at regular intervals in the filter layer 53 to efficiently use the filling volume of the wood chips. The malodor flow guide plate 54 is configured such that the gap of the open portion of the lower portion is the same as the gap of the open portion of the upper portion.

The outlet 55 is connected to the end of the filter layer 53. The outlet 55 is preferably connected to the filter layer 53 perpendicularly, and discharges the purified odor to the atmosphere while passing through the filter layer 53.

The sealing cover 40 according to the present invention is installed until the strength of the odor generated after the stratification storage operation is reached below the legal standard. In general, the sealing cover 40 may be transferred to another decomposition chamber 10 so that the intensity of the odor generated after 40 days or more reaches a legal standard or less.

When the sealing cover 40 is transferred to another decomposition chamber 10, the decomposition chamber 10 can not block falling rainwater, so that a rainwater barrier 25 is added to the upper part of the decomposition chamber 10 to exclude rainwater. Can be installed as

The rainwater barrier 25 is connected to the vertical drainage pipe 24 at the central portion of the upper surface, and is installed to have an inclination toward the edge of the upper surface. The inclination of the rainwater barrier 25 is preferably 5/100 or more. If the inclination is low, since rainwater does not flow along the inclined surface, there is a problem in that rainwater does not collect in the rainwater drain port 43.

The material of the rainwater barrier 25 is not particularly limited, but may be a synthetic resin.

The height of the rainwater barrier 25 may be lower than the rainwater drainage port 43 on the ground surface due to the settlement action that occurs as the decomposition reaction of the stratification proceeds. When the subsidence occurs, the rainwater dropped on the decomposition chamber 10 is introduced into the vertical drainage pipe 24 connected to the rainwater blocking membrane 25 and flows out through the groundwater collecting box 21.

Specifically, in order to maintain the temperature of the decomposition chamber 10, the soil insulating layer 26 may be further provided on the rainwater barrier 25. The thickness of the soil insulation layer 26 is preferably 0.6m or more.

In addition, the planting layer 27 may be formed on the upper surface of the soil insulation layer 26 to improve the environment of the decomposition chamber 10. Grass and the like are planted in the planting layer 27.

As shown in FIG. 2, one or more decomposing devices of organic waste and sewage sludge may be additionally installed. Gas transfer pipes 37 are connected to each other at an upper portion of the decomposition apparatus of the plurality of organic wastes and sewage sludge, and groundwater outlet pipes 23 are connected to each other at a lower portion thereof.

Organic waste 16 and sewage sludge 17 are decomposed under semi-dry anaerobic conditions to generate gaseous fuel. At this time, the gas fuel will contain a high concentration of methane gas.

The production of methane gas by the decomposition reaction of organic waste (16) and sewage sludge (17) under semi-dry anaerobic conditions is terminated in the range of 500 to 600 days after stratification, and after 400 days after stratification, Since the concentration is gradually lowered there is a problem that can not obtain a constant concentration of methane gas.

In order to solve the above problems, the decomposing device 10 of the organic waste 16 and the sewage sludge 17 is installed at regular intervals of five or more places and connected in parallel, so that gaseous fuel having a difference in concentration of methane gas according to the installation point is installed. It is possible to maintain the annual high concentration of the concentration of methane gas produced by mixing.

When the gaseous fuel production of the stratified layer including the soil 15, the organic waste 16, and the sewage sludge 17 is finished by using the decomposition apparatus of the organic waste and sewage sludge according to the present invention, the residue remains in the decomposition chamber 10. The residue to be becomes a stabilized inorganic.

The organic waste and sewage sludge decomposition apparatus according to the present invention to use the stabilized inorganic material as cover material

Separation unit (not shown) for sorting the stabilized inorganic material of the decomposition device by using a screen,

Mixing in which the pair of rotary shafts 112 are formed in parallel with a predetermined distance, and the inlet 111 of a predetermined size into which the selected stabilized inorganic material is injected is formed and the spiral screws 113 are continuously formed along the outer circumferential surface thereof. Grinder 110,

An ejector 120 including at least one ejection opening 121 in which a nozzle 122 is inserted at an end of the mixing grinder 110 and a cutter 123 which reciprocates vertically or vertically or horizontally;

It may further include a cover material reconstituting device consisting of a pressing molding machine 130 is formed with a plurality of pressing grooves 132 to a predetermined depth on the outer peripheral surface of a pair of adjacent drum-shaped body.

The sorting part is for removing waste having a specification that cannot be used as a cover material in the stabilized inorganic material, and is not particularly limited as long as the sorting part commonly used in the art for this purpose uses a screen. A small amount of metal, glass, cement, etc. caught on the screen is recycled or landfilled, and the stabilized inorganic material from which impurities are removed is transferred to the mixing grinder 110.

Mixing grinder 110 is composed of a small diameter standard inlet 111, a screw having a predetermined inclination to the outer peripheral surface of a pair of parallel rotating shaft 112 in a predetermined distance spaced inside the mixing grinder 110 ( 113 is continuously formed to form a spiral, the discharge port 121 is connected to the rear end of the mixing grinder 110.

Here, a plurality of upper rotation shaft 112 may be provided, and are formed in multiple stages above and below. In addition, the pair of rotation shaft 112 is configured to transmit the rotational force generated from the drive means 114, such as a motor provided separately using a chain or the like.

The mixed grinder 110 is supplied with a stabilized inorganic material passing through the sorting unit, and optionally a suitable amount of the moisture control agent.

Here, the moisture control agent is used to control the moisture of the stabilized inorganic material may be used at least one selected from moisture absorbent materials such as zeolites, loess, incineration ash and combustion materials or organic matters such as sawdust, rice husk, fallen leaves, charcoal.

It is preferable to maintain the moisture content of the stabilized inorganic material to 38 to 48% using the moisture control agent. When the water content of the stabilized inorganic material is less than 38%, the discharge rate is slowed, and cracking or splitting is easy to occur even after the spheronization is completed. When the water content is more than 48%, the stabilized inorganic materials are adhered or spherically formed between the grooves of the molding press. Sticking together, the production rate is lowered.

The amount of the moisture control agent may be calculated by the following formula. If the water content of the screen-selected 100g stabilized inorganic material is 50%, a method of calculating the amount of the moisture control agent added to obtain a stabilized inorganic material having a water content of 42% is as follows.

((100-50) + x): (100 + x) = ((100-42): 100)

Since x = 19.1 according to Equation 1, 19.1 g of the moisture control agent per 100 g of the stabilizing inorganic material having a water content of 50% can be obtained to obtain a mixed stabilizing inorganic material having a desired moisture content of 42%.

The stabilizing inorganic material and the moisture control agent introduced through the inlet 111 is made by grinding and mixing by the rotation of the rotary shaft 112, the properties are homogeneous by the grinding and mixing, the moisture content is controlled.

The discharger 120 is composed of a discharge port 121 for discharging the mixed sludge and a cutter 123 for cutting the discharged material to a predetermined standard by reciprocating vertically or horizontally.

The discharge port 121 is formed with a nozzle 122, the discharge aperture is gradually reduced to increase the strength of the mixed stabilized inorganic material discharged.

The press molding machine 130 is connected to the ejector 120 and is provided with a pair of drum-type rollers 131 which rotate in opposite directions and circumscribe in the longitudinal direction, and have a semicircular groove on the outer circumferential surface of the roller 131. A plurality of 132 are formed continuously along the length surface of the roller 131. The mixed stabilized inorganic material passing through the ejector 120 is introduced into the semicircular groove 132 of the outer circumferential surface of the roller 131 to form a compression sphere.

In this case, the roller 131 has a spherical body having a high mechanical strength by lengthening the time that the mixed stabilized inorganic material is injected between the grooves 132 by varying the rotation speed.

In addition, the mixed and stabilized inorganic material is evenly distributed along the length surface of the roller 131 to form a feed supply means 133, such as a conveyor belt, so as not to bias the load and the side of the feed supply means 133 Compressed air classifying hole 134 is formed in the plurality of the seal (135) perforated to be supplied to the mixed stabilized inorganic material conveyed to the compressed air supplied from the compressed air supply device (not shown) between the roller 131.

In addition, the sealer 135 is installed in a stepwise manner that gradually narrows the rear end of the transfer supply means 133 so that the material to be conveyed is sequentially supplied between the rollers 131.

Looking at the use of the decomposition apparatus according to the present invention having the above configuration is as follows.

First, the soil 15, the organic waste 16, and the sewage sludge 17 are sequentially stacked in the decomposition chamber 10. Here, the organic waste 16 may be mixed with wood chips, and the soil 15 may be used after it is naturally dried. The stratification of soil 15, organic waste 16 and sewage sludge 17 may be stratified more than once.

In the decomposition chamber 10, the organic waste 16 and the sewage sludge 17 generate flammable gas fuel when the decomposition reaction is performed under semi-dry anaerobic conditions. The gas fuel is transferred to the gas collecting tube 31 through the collecting auxiliary pipe 32 and the filling table 33, or moved to the collecting protection tube 32 along the collecting auxiliary pipe 34 and then the filling table 33. It is transferred to the gas collecting tube 31 through. When the control valve 36 of the gas collecting unit 30 is opened, the gas fuel is transferred to the gas transfer pipe 37 and flows out.

During the stratification and decomposition reaction of the organic waste 16 and sewage sludge 17, leachate and odor are generated in the decomposition chamber 10.

The leachate penetrates down and is collected in the leachate collecting pipe 12 after passing through the nonwoven film 14 and the drainage layer 13. Collected leachate is stored and recycled periodically to the decomposition chamber.

The odor is conveyed to the microbial filter bed 50 through a pipe 46 located on the upper surface of the sealing cover 40. When the malodor inflow amount control valve 52 of the malodor inlet 51 is opened, the malodor is moved to the filter layer 53, is purified while passing through the filter layer 53, and is discharged to the outside through the outlet 55.

On the other hand, when the decomposition reaction of the organic waste 16 and the sewage sludge 17 is terminated, the residue in the decomposition chamber 10 becomes a stabilized inorganic material. The stabilized inorganic material is transferred to the cover material reproducing apparatus 100 to use the cover material.

The stabilized inorganic material is transferred to the sorting unit of the cover material reconstruction device 100 so that a small amount of waste such as metal, glass, cement, etc. caught on the screen is recycled or landfilled, and the stabilized inorganic material, from which impurities are removed, is mixed again with a grinder 110. Is transferred to).

The moisture control agent is added to the stabilized inorganic material added to the mixed grinder 110 of the cover material reconstruction device 100 to adjust the moisture content of the stabilized inorganic material.

In the decomposition chamber 10, the amount of the stabilized inorganic material generated after the completion of the decomposition reaction is about 50%, and the moisture content of the stabilized inorganic material is maintained at 38 to 48% using the moisture control agent. Here, the amount of the moisture control agent is added by calculating the equation (1).

The stabilized inorganic material and the moisture control agent introduced into the inlet 111 of the mixing grinder 110 is pulverized and mixed by the rotation of the rotating shaft 112 of the mixing grinder 110. The stabilized inorganic material is mixed and stabilized as the properties are homogenized and moisture content is controlled while repeating grinding and mixing. The mixed and stabilized inorganic material is extruded through the discharge port 121 of the ejector 120 after passing through the rotary shaft 112 located at the lowermost end.

The extruded mixed stabilized inorganic material is cut to a predetermined size by the cutter 123 and then transferred to the compression molding machine 130.

The mixed and stabilized inorganic materials are introduced into the grooves 132 of the compression molding machine 130 to form a compression sphere.

The compressed spherical stabilized inorganic material is used as a sanitary landfill cover material after natural drying.

Hereinafter, the present invention will be described through experimental and comparative examples. We also describe a semi-dry anaerobic cracker on a commercially available scale.

Experimental Example

Soil 15, organic waste 16, and sewage sludge 17 were stratified in a decomposition chamber having a depth of 82.5 cm. The soil (15), organic waste (16) and sewage sludge (17) were laminated in three layers of 5.5 cm, 16.5 cm, and 5.5 cm, respectively.

The methane gas concentration generated in the decomposition chamber was measured and the results are shown in Table 1 and FIG. 8.

In addition, in order to use the sewage sludge as a cover material, the content of carbon contained in the sewage sludge was measured and shown in Table 2 below.

Comparative Example

Compared with the above Experimental Example, except that the mixture of soil and organic waste and sewage sludge in the decomposition chamber was laminated in the same manner as in Experiment 1.

At this time, the thickness of the mixture of soil and organic waste and sewage sludge was 5.5 cm and 21 cm, respectively.

The methane gas concentration generated in the decomposition chamber was measured and the results are shown in Table 1 and FIG. 1.

Duration (days) 90 180 270 360 450 540 CH ₄ concentration (vol .-%) Experimental Example 41.8 62.5 52.3 50.6 3.9 0.0 Comparative Experiment 19.4 45.7 55.2 51.4 19.7 11.3

(Methane Gas Concentration in Stratified and Mixed Storage of Organic Wastes and Sewage Sludge)

As shown in Table 1, in the experimental example, the concentration of methane gas generated over 90 days was over 40%, but in the comparative experimental example, the result exceeded 40% due to 160 days. This is due to the temperature drop in the decomposed bed and the weak growth rate of methane bacteria in the comparative experiments, in which the leachate runoff generated during the storage of the mixture of soil and organic waste and sewage sludge is not smooth.

In the comparative experimental example, the high concentration (40% or more) of methane gas generation period is short, and the low concentration methane gas generation period is long, and economic efficiency is low even when using methane gas as an energy source.

Organic waste and sewage sludge mixtures are inconsistent in density, viscosity, composition size, etc. of organic waste and sewage sludge. Strength is very large. Therefore, it is necessary to install a deodorizing facility for odor treatment and a huge cost for operation for mixing. And mixing requires a high level of skill.

As shown in Table 1 and Figure 8, since the concentration of methane gas in the gas fuel measured in the experimental example is not measured at 520 days, to collect and use a high concentration of methane gas in a range and decompose to use the stabilized inorganic material as cover material The biodegradable waste stratification storage period of the seal should be spaced 500-600 days apart.

As shown in Table 2, sewage sludge continues to decompose after stratified storage to become a fixed carbon-containing stabilized inorganic material.

Duration (days) 90 180 270 360 450 540 Carbon content rate (%) 34.47 23.18 19.02 17.36 16.27 15.94

(Carbon Content in Sewage Sludge Stored in Stratified Example)

In stratospheric storage, the amount of carbon in sewage sludge was 38.43%, but it was greatly reduced to 34.47% on 90 days and 23.18% on 180 days. The state has been reached.

Commercially available scale breakers are as follows.

As shown in Figure 2, five decomposition chambers were installed in the sanitary landfill at the end of the landfill, but the volume of one was 3,650 m ³ . The installation depth of the decomposition chamber was set to 16.5m, the inclination of the slope of about 60 degrees, and the decomposition chamber was installed so that the upper surface 18.0 × 18.0 (m), the lower surface 12.0 × 12.0 (m) standards.

Next, a high density polyethylene waterproof membrane 11 is installed inside the decomposition chamber, and a leachate collection pipe 12 formed of polyethylene having a diameter and a length of 0.2 × 12.0 (m) is connected to the center and left and right centers of the bottom. So that the collected leachate is treated with natural runoff externally.

Then, the soil 15, the food waste 16 and the sewage sludge 17 stratified in the installed decomposition chamber, when the food waste 16 is stacked, the gas collecting unit 30 was installed. The gas collecting unit 30 has a diameter and a length of 0.1 × 17.0 (m) and a gas collecting tube 31 having a plurality of holes formed on an outer circumferential surface of polyethylene, having a diameter and a length of 0.25 × 1 6.0 (m) It consists of a collection protection tube 32 is formed in the outer circumferential surface and formed a plurality of holes in the collection protection tube 32 was filled with wood chips less than 0.08m in length. In addition, the collection auxiliary pipe 34 was installed to support the gas collecting unit 30 by installing 16 hard polyethylene pipes having a diameter of 12 mm formed on the outer circumferential surface of the collecting auxiliary pipe 34 to reach the side of the waterproof membrane 11.

In the decomposition chamber 10, 18 steps of stratification were performed, and 16 gas collection auxiliary pipes 34 were installed at each step.

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. The scope of the invention is indicated by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the invention. do.

1 is a processing process diagram showing a process of producing gaseous fuel and sanitary landfill cover by stratifying organic waste, sewage sludge and soil according to the present invention;

2 is a block diagram of a decomposition apparatus according to the present invention,

3 is a cross-sectional view showing a decomposition chamber of a decomposition apparatus according to the present invention,

4 is a perspective view showing a gas collecting unit of the decomposition apparatus according to the present invention;

5 is a cross-sectional view showing a sealing member of the decomposition apparatus according to the present invention;

6 is a cross-sectional view showing a microbial filter of the decomposition apparatus according to the present invention;

7 is a block diagram showing a cover material reproducing apparatus of the decomposition apparatus according to the present invention,

8 is a graph showing the concentration of methane in the gaseous fuel generated in the stratification of organic waste and sewage sludge and a mixture of organic waste and sewage sludge.

<Description of the symbols for the main parts of the drawings>

10: decomposition chamber 11: waterproof membrane

12: leachate collection pipe 13: drainage gravel layer

14 nonwoven fabric 15 soil

16: organic waste 17: sewage sludge

21: groundwater collection box 22: clogging prevention layer

23: groundwater outflow pipe 24: vertical drainage pipe

25: rainwater barrier 26: soil insulation layer

27: planting layer 30: gas collection unit

31: gas collection tube 32: collection protection tube

33: filling station 34: collection assistant

35: rubber belt 36: control valve

37: gas transfer pipe 40: airtight cover

41: membrane 42: condensate collector

43: rain drain drain 44: sealed door

45: odor outlet 46: pipe

50: microbial filter 51: odor inlet

52: odor inflow control valve 53: filter layer

54: odor flow guide plate 55: outlet

100: cover material recycling device 110: mixing grinder

111: inlet 112: rotating shaft

113: screw 114: drive means

120: ejector 121: discharge port

122: nozzle 123: cutter

130: compression molding machine 131: roller

132: groove 133: transfer supply means

134: classifier 135: seal

Claims (14)

One or more layers of soil, organic waste and sewage sludge are sequentially stacked in the decomposition chamber, and a gas collecting unit for collecting gaseous fuel generated by the decomposition reaction of the organic waste and sewage sludge under semi-dry anaerobic conditions is formed inside the decomposition chamber. Decomposition system of organic waste and sewage sludge installed in the plant. delete delete delete delete The method of claim 1, The gas collecting unit is a tube-shaped gas collecting tube formed with a plurality of holes in the outer peripheral surface; A collecting protection tube surrounding an outer circumferential surface of the gas collecting tube and having a plurality of holes formed in the outer circumferential surface; A filling band formed between the gas collecting tube and the collecting protection tube; And It is installed radially connected to the outer circumferential surface of the collecting protection tube, the decomposing device of organic waste and sewage sludge, characterized in that it comprises a collecting trap tube of a plurality of holes formed on the outer circumferential surface. delete The method of claim 1, The ratio of the volume of the soil, organic waste and sewage sludge is 0.5 ~ 1.5: 1.5 ~ 4.5: 0.5 ~ 1.5 decomposition apparatus of organic waste and sewage sludge. delete The method of claim 1, Decomposition apparatus of organic waste and sewage sludge, characterized in that the sewage sludge is installed inclined to facilitate the drainage of leachate. The method of claim 1, Membrane for blocking the decomposition chamber and the outside on the top of the decomposition chamber; and a sealing cover which is formed in the center of the side of the sealing door to the interior of the decomposition chamber further comprises a decomposition apparatus for organic waste and sewage sludge. The method of claim 11, An apparatus for decomposing organic waste and sewage sludge, further comprising: a microbial filter bed comprising an odor inlet, a filter layer connected to the odor inlet, and an outlet connected to an end of the filter layer. The method of claim 1, At least one decomposer is installed and the at least one decomposer is installed in parallel with each other by a gas transfer pipe, and each lower part of the organic waste and sewage sludge is installed in connection with each other by a groundwater outlet pipe. Decomposition device. The method of claim 1, A sorting unit for sorting the stabilized inorganic material of the decomposition apparatus by using a screen; A mixing grinder in which a pair of rotary shafts in which a predetermined size of an input hole into which the selected stabilized inorganic material is injected is formed and a spiral screw is continuously formed along an outer circumferential surface thereof is parallel and spaced apart from each other; An ejector comprising at least one ejection opening in which a nozzle is inserted at an end of the mixing mill, and a cutter configured to reciprocate up and down or left and right constantly; Decomposing device of organic waste and sewage sludge, characterized in that it further comprises a cover material reconstituting device consisting of a compression molding machine having a plurality of compression grooves in a predetermined depth on the outer peripheral surface of a pair of adjacent drum-shaped body.

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