KR20080104223A - Food waste water disposal and bio-gas collecting apparatus - Google Patents

Abstract

An apparatus for treating food waste wastewater and collecting gas is provided to collect a biogas by supplying waste water generated after food waste is treated and to produce a biogas by generating an anaerobic digestion process with reclaimed waste. An apparatus for treating food waste wastewater and collecting gas contains a waste water storing tank(10) storing the waste water supplied through waste water carrying vehicles or conduit lines, a waste water pump(20) and a waste water supply pipe(21) supplying the waste water to waste water supply openings(30), the plurality of waste water supply openings(30) supplying the waste water to landfill by receiving the waste water from the waste water pump and the waste water supply pipe; a gas collecting unit(40) collecting a gas generated in each reclamation layer; a bio gas recovery pump(50) ejecting the biogas of the landfill outside; and a gas collecting part(60) for storing the biogas.

Description

Food waste water disposal and bio-gas collecting apparatus

The present invention relates to a food waste wastewater treatment and biogas recovery apparatus, and in particular, organic wastewater is temporarily stored in a storage tank, and then injected into a negative wastewater supply port filled with a large pore material through a transport pipe into the landfill where the waste is buried. The present invention relates to a food waste wastewater treatment and biogas recovery device that generates biogas such as methane gas and generates and recycles it through a gas collection pipe by generating an anaerobic digestion process along with the landfilled waste.

Negative wastewater (eluent, leachate, condensate, etc.) generated during the food waste treatment process varies depending on the treatment method, but on average, a considerable amount is generated, about 80% of the throughput, and a high concentration of organic wastewater of BOD 20,000 to 150,000 mg / L to be.

The treatment method of negative wastewater, which is a high concentration of organic wastewater, includes self-treatment, first-line treatment, and sewage treatment plant, and ocean discharge.

First, as a methane fermentation process through anaerobic digestion tank, which is a self-treatment method, traditional methods and construction costs, which have been developed in the past, are expensive, and excessive costs due to generation and treatment of by-products (sludge) and energy consumption for heating digestion tanks are excessive.

Second, the wastewater treatment facility within the food waste treatment facility is equipped with a wastewater treatment facility to treat the wastewater under an appropriate load and connect it to a sewage treatment plant.However, there is a lack of high concentration wastewater treatment technology that can treat negative wastewater below a certain load. Operating costs such as treatment costs are high. In addition, when the treated water is introduced into the sewage treatment plant, the load of the sewage treatment plant is increased and there is a fear of deterioration of the water environment.

Third, due to the recent increase in ocean emissions, the high concentrations of COD and nutrients in the waste water during dumping of the waste water cause eutrophication and red tide of the sea area, and it is the most toxic to microbial activity compared to other wastes, causing disturbance to the marine ecosystem. Can cause.

On the other hand, the landfill used as a means for final disposal of waste is basically an anaerobic digestion principle. In this anaerobic digestion principle, the most important is the supply of high concentrations of organic materials, and the optimal supply of water in general.In general, landfills have a lower water content than the optimum water content for methane formation, but anaerobic digestion through external influent such as rainwater It will replenish the needed moisture. However, stabilization may be delayed due to lack of water in the case of landfills where rainfall is low in winter or landfilling is completed and rainwater is blocked into the final cover layer.

Therefore, the decomposition of the landfill waste may be delayed by insufficient water in all landfilled landfills or landfills, and therefore, supply of water is necessary.

In order to achieve an optimum moisture content for biodegradation in landfills, a leachate recycling system of waste landfills according to the prior art which recycles leachate into landfills is disclosed in Korean Patent No. 10-0223308.

1 shows a process flow chart of a leachate recycle treatment system for a landfill in accordance with the prior art.

The leachate recycling treatment system of landfills according to the prior art treats leachate 1 in which waste is collected and accommodated, a leachate collecting tank 2 for collecting leachate generated in the landfill 1 and the leachate of the leachate collecting tank 2. It is composed of a leachate treatment plant 6 composed of a methane bacteria producing tank 3, an anaerobic digestion tank and a nitrification tank 4, and a long-term aeration type nitrification tank 5.

The leachate recycling treatment system of landfills according to the prior art relates to a technology for supplying leachate with water supplied to a landfill corresponding to an anaerobic digester, and the supply of nutrients is very small. In addition, when the leachate is recycled, gas may be discharged to the injection facility, which may make injection difficult.

For this reason, using wastewater to supply high concentrations of organic materials and water as carbon sources, the most important element of methane generation, activate anaerobic conditions of landfills, and connect gas discharge pipes to injection facilities to smoothly methane gas generated during anaerobic digestion. Needed to vent.

The present invention has been made in order to solve the above problems, an object of the present invention is to supply food waste water waste water treatment to the waste land generated after the food waste treatment inadequate moisture in the landfill waste and waste water treatment and It is to provide a biogas recovery apparatus.

Another object of the present invention is to provide a food waste wastewater treatment and biogas recovery apparatus that does not require a separate site and investment costs for the treatment of high concentration wastewater by supplying the wastewater generated after food waste treatment to landfill or landfilled waste landfill will be.

Another object of the present invention is to supply the water and nutrients required for the anaerobic digestion of landfills to the wastewater generated from food waste to increase the production of biogas by supplying organic matter contained in the wastewater for digestion of waste. To provide a food waste wastewater treatment and biogas recovery apparatus.

Another object of the present invention is to provide a food waste wastewater treatment and biogas recovery apparatus that can increase the generation of biogas from landfills and use it as energy to secure energy saving and carbon dioxide emission rights.

Food waste and wastewater treatment and biogas recovery apparatus according to the present invention includes a negative wastewater storage tank for storing the negative wastewater supplied through the negative wastewater transport vehicle or pipeline; A negative waste water pump and a negative waste water supply pipe for sucking the negative waste water stored in the negative waste water storage tank and supplying the negative waste water to the negative waste water supply port; A plurality of negative wastewater supply ports formed by excavating in an upper or middle cover layer of the waste landfill, and receiving negative wastewater from the negative wastewater pump and the negative wastewater supply pipe and supplying the negative wastewater to the landfill; A gas collection well which stands vertically from the bottom of the landfill to an upper predetermined height to recover biogas generated in each landfill layer; A biogas recovery pump connected to the gas collecting well and discharging the biogas of the landfill to the outside; The gas collecting unit is connected to the biogas recovery pump and stores the biogas.

The negative waste water supply port according to the present invention is characterized by digging a buried layer to a predetermined width, digging a puddle and filling a porous member so as to form voids so that the negative waste water penetrates well.

The depth of the cover layer according to the present invention is characterized in that it is determined in consideration of the depth of the ground does not freeze in winter.

The distal end of the negative wastewater supply pipe according to the present invention is larger than twice the diameter of the negative wastewater supply pipe so that the negative wastewater is spread widely when discharged from the negative wastewater supply pipe, and more preferably, the distal end of the negative wastewater supply pipe is horizontal and vertical. And a plurality of branch pipes 24 formed at 45 °.

The gas collecting well according to the present invention is installed from the bottom of the landfill at the time of the first filling of the buried layer, and as the buried layer is increased, the gas collecting well is connected to extend the height.

The gas collection well and the negative waste water supply port according to the present invention are installed even during the embedding of the intermediate buried layer, characterized in that the negative waste water supply and the biogas collection are performed in parallel.

The negative wastewater supply port according to the present invention penetrates the negative wastewater supply well from the middle landfill layer or the uppermost landfill layer to the respective landfill layer below the negative wastewater supply port to supply the negative wastewater from the middle landfill layer or the uppermost landfill layer. It is characterized in that to continuously supply negative waste water.

The wastewater supply port according to the present invention does not close even when the waste is buried in the upper buried layer, but after covering with the wastewater supply pipe connected, the waste is buried in the upper layer so that the wastewater can be supplied even when the landfill is completed. It features.

As described above, according to the present invention, when the decomposition of landfill waste is delayed due to insufficient water in all landfills completed or completed, the water content of landfill waste is increased by injecting negative waste water, thereby stabilizing waste faster than general landfill, By supplying organic materials, not only wastewater can be treated without by-products at low cost and low energy, but also the methane generation rate is increased, and the recovery of methane gas can contribute to preventing global warming and secure carbon dioxide emission rights.

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

2 is a cross-sectional view showing the configuration of a food waste wastewater treatment and a biogas recovery apparatus according to the present invention.

Food waste and wastewater treatment and biogas recovery apparatus according to the present invention includes a negative wastewater storage tank (10) for storing the negative wastewater supplied through a wastewater tank lorry vehicle or pipeline; A negative waste water pump 20 and a negative waste water supply pipe 21 for sucking the negative waste water stored in the negative waste water storage tank 10 and supplying the negative waste water to the negative waste water supply port 30; Formed by excavating in the upper or middle cover layer of the waste landfill, and a plurality of negative wastewater supply port 30 for receiving negative wastewater from the negative wastewater pump 20 and the negative wastewater supply pipe 21 to supply the negative wastewater to the landfill; ; A plurality of gas collection wells 40 which are erected vertically from the bottom of the landfill to an upper predetermined height to recover biogas generated in each landfill layer; A biogas recovery pump 50 connected to the gas collecting well 40 for discharging the biogas of the landfill to the outside; The gas collecting unit 60 is connected to the biogas recovery pump 50 to store biogas.

Here, reference numeral 32 denotes a gas discharge pipe for discharging the gas generated in the negative wastewater supply port 30 by connecting the negative wastewater supply port 30 and the gas collection well 40, and reference numeral 81 denotes a leachate discharge pipe for discharging the leachate. .

The landfill is installed in a vacant lot near the city, and the leachate generated from the landfill is a high concentration wastewater containing various inorganic materials, organic materials, and heavy metals. Should be equipped.

To this end, a water-repellent membrane made of a high-density polyethylene product made of impermeable material is installed, a leachate discharge pipe is installed on the water-repellent membrane, and the landfills composed of a plurality of landfill layers are repeated by reclaiming waste to a depth of about 5 m and applying soil cover. Form.

The wastewater storage tank 10 may be made by constructing a concrete structure by digging the ground near the landfill site 100 or using a large metal tank landfill, and coming from a wastewater tank lorry that collects food waste separately. Drinking wastewater is supplied through pipelines that supply animal waste.

Here, "wastewater" means "high concentration organic wastewater generated from food waste treatment facilities such as composting and feed plants", and is a liquid component remaining after removing solids by dehydrating food waste.

The negative waste water storage tank 10 is provided with a negative waste water pump 20, and a filter is attached to the suction port of the negative waste water pump 20 to filter solids remaining in the negative waste water. The negative waste water pump 20 is connected to the negative waste water supply pipe 21 and extends to the negative waste water supply port 30, and the negative waste water sucked from the negative waste water pump 20 is formed by digging in the upper or middle cover layer of the waste landfill. It is supplied to the negative waste water supply port (30).

In addition, effluent water supplied through a effluent transport vehicle or pipeline may be mixed with leachate or an alkaline chemical agent may be added if necessary to adjust the pH to an appropriate anaerobic digestion.

3A is a cross-sectional view of a negative wastewater supply port provided with a negative wastewater supply pipe according to the present invention, and a cross-sectional view of a supply hole provided with a negative wastewater supply pipe having radially open ends is shown in FIG. 3B.

The negative wastewater supply port 30 according to the present invention excavates the landfill layer 70 to a predetermined width to dig a puddle and fill the porous member 31 formed of recycled aggregate such as gravel, crushed stone or waste with a large gap. The air gap is formed so as to permeate well, and the end portion 22 of the negative wastewater supply pipe 21 is buried to a certain depth and covers the cover layer 80.

The depth h ₁ of the cover layer 50 is generally formed to a depth of 30 cm, and the depth h ₂ of the sound wastewater supply port 30 is formed by digging to a depth of 1.5 to 3 m from the bottom surface of the cover layer 80. Thus, the depth of the cover layer is determined in consideration of the depth of the land that does not freeze in winter in Korea.

Here, the distal end portion 22 of the negative wastewater supply pipe 21 is larger than twice the diameter of the negative wastewater supply pipe 21 so that the negative wastewater is spread widely when being discharged from the negative wastewater supply pipe 21, and more preferably. As shown in 3b, the distal end 23 of the negative wastewater supply pipe 21 may be attached to a plurality of branch pipes 24 formed at horizontal, vertical, and 45 ° so that the negative waste water may be evenly supplied to the buried layer.

The gas collection well 40 is erected vertically from the bottom of the landfill to the height of the landfill layer being buried and recovers the biogas generated in each landfill layer 70 and supplies it to the collection pump 50 through the collection pipe 41. The collection radius of the gas collection well 40 is set at 30-50 m so that the collection radius is about 20 m, and a polyethylene perforated pipe is used.

In order to supply the wastewater during the landfill and to recover the biogas, as shown in FIG. 4, after the first landfill layer 71 is buried, a negative wastewater supply port 30 is formed below the cover layer 80 to form a negative wastewater storage tank 10. Negative wastewater is supplied through the negative wastewater supply pump 20 and the negative wastewater supply pipe 21).

At the time of filling the first buried layer, the gas collecting well 40 is installed to increase the height by connecting the gas collecting well 40 as the buried layer is increased. Thus, after the completion of the landfill can be solved the difficulty of the construction due to the collapse of the gas collection well 40 in the upper part of the landfill, that is, unstable landfill due to the weight of large diameter drilling equipment.

Also, in general, the landfill is completed by filling the landfill step by step, and the gas collecting well 40 and the wastewater supply port 30 are installed in the first landfill layer 71 even during the second landfill layer 72. Simultaneously collect biogas.

The wastewater supply port 30 installed in the first landfill layer 71 is closed at the time when the landfill of the second landfill layer 72 is to be landfilled on the negative wastewater supply port 30 of the first landfill layer 71. After covering, cover the garbage in the second landfill layer.

As in the above embodiment, when the landfill of the second landfill layer 72 is in progress, when the landfill is disposed on the negative wastewater supply port 30 of the first landfill layer 71, the first landfill layer 71 may not supply wastewater.

5 is a cross-sectional view showing the configuration of another embodiment in which a negative wastewater supply well is installed from each of the negative wastewater supply ports to each buried layer.

The landfill 200 according to the present embodiment has the same configuration as the landfill 100 shown in FIG. 2, but the negative wastewater supply well 32 is installed from the negative wastewater supply port 30 installed in the topmost landfill layer to each of the landfill layers. Afterwards, the wastewater supply well 32 is drilled into each of the buried layers at the bottom to continue to supply the wastewater.

As in the above embodiment, when the landfill is disposed above the negative wastewater supply port of the landfill layer in which the landfill is completed, it is not possible to supply the wastewater to the lower landfill layer. To solve this problem, the waste can be landfilled while the wastewater supply pipe is connected to the wastewater supply port of the lower landfill layer.

6 is a cross-sectional view showing the configuration of another embodiment of the food waste wastewater treatment and biogas recovery apparatus according to the present invention.

The present embodiment can be applied in the process of burying large-scale landfills into a plurality of sectors, and burying each sector sequentially, in each sector, and can also be applied to the entirety of a small landfill.

A negative waste water storage tank 90 is installed in the vicinity of the landfill sector 300, and the negative waste water is supplied from the food processing facility 91 through the conduit 91 ′ or transported to the negative waste water tank lorry vehicle 92. Receive the wastewater.

The negative wastewater stored in the negative wastewater storage tank 90 is adjusted to be weakly alkaline by mixing alkaline chemicals or mixing leachate to make a pH suitable for anaerobic digestion if necessary.

The negative wastewater adjusted to a pH suitable for anaerobic digestion is supplied to the negative wastewater supply ports 94, 94 ', and 94 "through the negative wastewater supply pipe 93' by the negative wastewater supply pump 93.

The wastewater supply ports 94, 94 ', 94 "according to the present embodiment are not closed even when the waste is buried in the upper buried layer, but covered with the wastewater supply pipe 93' connected thereto, so that the waste is buried in the upper layer. Ensure that the wastewater is supplied even when the landfill is completed.

Between the gas collection well 96 and the negative wastewater inlets 94, 94 ', 94 ", the gas outlet pipes 95, 95', 95" are connected to the buried bed or the negative wastewater inlets 94, 94 ', 94 ". The biogas generated in) is discharged to the gas collection well 96.

In addition, the uppermost buried layer 97 "may be provided with a direct wastewater supply pipe 98 so that the wastewater may be supplied through a wastewater tank lorry vehicle or a pipeline without a wastewater storage tank.

Therefore, after a certain period of time after the completion of the landfill is completed, the problem that the organic gas is exhausted and the amount of biogas generated less and the digestion progress due to the lack of moisture is slowed by the negative wastewater supply device according to the present invention.

1 is a process flow chart of a leachate recycle treatment system for a landfill in accordance with the prior art;

2 is a cross-sectional view showing the configuration of a food waste wastewater treatment and a biogas recovery apparatus according to the present invention;

Figure 3a is a cross-sectional view of the negative waste water supply port equipped with a negative waste water supply pipe according to the present invention,

Figure 3b is a cross-sectional view of the supply port is provided with the negative waste water supply pipe with a radially open end;

Figure 4 is a cross-sectional view showing the configuration of a food waste wastewater treatment and biogas recovery apparatus for supplying negative wastewater to the lower buried layer during the buried middle buried layer according to the present invention;

Fig. 5 is a sectional view showing the construction of still another embodiment in which a negative wastewater supply well is provided from each of the negative wastewater supply ports to each buried layer according to the present invention;

6 is a cross-sectional view showing the configuration of another embodiment of a food waste wastewater treatment and biogas recovery apparatus according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: wastewater reservoir 20: wastewater pump

21: wastewater supply pipe 30: wastewater supply port

40: gas collection well 50: gas recovery pump

60: gas collecting portion 70: buried layer

80: cover layer

Claims (8)

A negative waste water storage tank (10) for storing negative waste water supplied through a negative waste water transport vehicle or pipeline; A negative waste water pump 20 and a negative waste water supply pipe 21 for sucking the negative waste water stored in the negative waste water storage tank 10 and supplying the negative waste water to the negative waste water supply port 30; Formed by excavating in the upper or middle cover layer 80 of the waste landfill 100, a plurality of wastewater supplied to the landfill 100 by receiving the negative wastewater from the negative wastewater pump 20 and the negative wastewater supply pipe 21 Negative waste water supply port 30 and; A gas collection well 40 which stands vertically from the bottom of the landfill 100 to a predetermined height and recovers biogas generated in each landfill layer; A biogas recovery pump 50 connected to the gas collection well 40 to discharge biogas from the landfill 100 to the outside; Food and waste wastewater treatment and biogas recovery apparatus, characterized in that consisting of a gas collection unit 60 is connected to the biogas recovery pump (50) for storing biogas. According to claim 1, The negative waste water supply port 30 is excavated in a predetermined area to excavate the buried layer 70 to fill a porous member 31 formed of recycled aggregates such as gravel, crushed stone or waste with large voids Food waste wastewater treatment and biogas recovery apparatus, characterized in that the voids are formed so that the negative wastewater well permeates. The food waste wastewater treatment and biogas recovery apparatus according to claim 1, wherein the depth of the cover layer is determined in consideration of the depth of the ground which is not frozen in winter. According to claim 1, wherein the distal end portion 22 of the negative wastewater supply pipe 21 is larger than twice the diameter of the negative wastewater supply pipe 21 so that the negative wastewater is spread widely when discharged from the negative wastewater supply pipe 21 And, more preferably, the food waste wastewater treatment and biogas recovery apparatus, characterized in that the end portion 23 of the negative wastewater supply pipe 21 is attached to a plurality of branch pipes 24 formed in horizontal, vertical and 45 °. The food logistics of claim 1, wherein the gas collecting well 40 is installed from the bottom of the landfill when the first landfill layer is buried, and the gas collecting well 40 is connected to the gas collecting well 40 so as to extend the height thereof. Waste wastewater treatment and biogas recovery device. The food waste wastewater treatment and biogas of claim 1, wherein the gas collection well 40 and the negative wastewater supply port 30 are installed during the landfill of the intermediate landfill layer, and the negative wastewater supply and the biogas collection are performed in parallel. Recovery device. The intermediate landfill layer (72) or the uppermost landfill layer (73) according to claim 1, wherein the negative wastewater supply port (30) supplies the negative wastewater from the intermediate landfill layer (72) or the uppermost landfill layer (73) to the subsequent landfill layer. Food waste wastewater treatment and biogas recovery, characterized in that the wastewater supply port 32 through the negative wastewater supply well 32 from the negative wastewater supply port 30 to continuously supply the negative wastewater Device. According to claim 1, wherein the wastewater supply port 30 is not closed even when the waste is buried in the upper buried layer and covered with the negative wastewater supply pipe (93 ') connected, the landfill is completed by allowing the waste to be buried in the upper layer Food waste and wastewater treatment and biogas recovery device, characterized in that to receive the waste water.

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