KR102045190B1 - Production System for Agent of Production Increase for Biogas Using Food Waste Water - Google Patents

Abstract

The present invention relates to a biogas transpiration agent production system using food waste water inserted into an anaerobic digestion tank, comprising: a food waste water fermentation tank for mixing introduced food waste water and a culture medium produced in a microorganism culture device, and fermenting the mixture; an oil removal device for removing oil and suspended substances contained in the food waste water; a purification concentration device for producing a biogas transpiration agent by purifying and concentrating the food waste water from which the oil is removed; and a microorganism culture device for culturing microorganisms with the produced biogas transpiration agent. According to the present invention, it is possible to increase an amount of biogas generated in the anaerobic digestion tank by inserting the transpiration agent produced by using the system of the present invention into the anaerobic digestion tank of a sewage treatment plant, and to solve a scale problem due to oil which may be generated when food waste water is combined with sewage and a problem of increase in processing costs due to increase in concentration of hydrogen sulfide in a digestion tank and increase in an amount of sludge generated.

Description

Production System for Agent of Production Increase for Biogas Using Food Waste Water}

The present invention relates to a biogas thickener production system using negative waste water, and more particularly, to clean and concentrate a negative waste water fermentation tank, an oil removal device, and a negative waste water from which oil is removed through a filtration membrane to produce a biogas thickener. The present invention relates to a biogas transcriptant production system using negative wastewater, including a microorganism culturing apparatus for culturing microorganisms using a concentrator and a produced biogas transcriptant.

The modern society is faced with a large amount of waste disposal problems that arise with high industrial development. Among them, organic wastes such as food waste, livestock manure, and sewage sludge have been banned from dumping at sea since 2012.

Among the methods for the treatment of such organic waste is anaerobic digestion, which is a biological treatment. Anaerobic digestion is superior to aerobic digestion and is now widely used for the treatment of organic waste. In particular, anaerobic digestion has developed into an eco-friendly resource recycling processing method that produces fuel and compost through organic waste, in addition to the simple decomposition and treatment of organic wastes, and composting and feed facilities, which occupy most of the domestic organic waste recycling facilities. It is being converted to a biogas plant using this anaerobic digestion method.

As mentioned above, the role of anaerobic digester is to reduce the load by microorganisms in the anaerobic state by decomposing organic matters, and increasing contact between organic matter and activated microorganisms through sufficient agitation is one of the important ways to increase the decomposition efficiency. One.

However, in the anaerobic digestion of wastewater sludge, biogas generation tends to be lowered due to the imbalance of the organic waste introduced into the digester and the degradation of microbial activity.

In order to solve the above-mentioned problem, KR Patent Application No. 10-2016-0120024 (name of the invention: organic waste treatment apparatus using a high-efficiency anaerobic digester), in which the organic waste reacts in a digester → settles → discharges several times. Repeatedly, an organic waste treatment apparatus is disclosed in which biogas is generated with high efficiency through digestion by anaerobic microorganisms.

However, the organic waste treatment apparatus described above has a problem in that biogas production efficiency is lowered because the degree of microbial decomposition of organic waste introduced into the digester is not constant.

Throughout this specification, many papers and patent documents are referenced and their citations are indicated. The disclosures of cited papers and patent documents are incorporated herein by reference in their entirety, and the level of the technical field to which the present invention belongs and the contents of the present invention are more clearly explained.

The inventors of the present invention focus on being affected by the production rate of biogas according to the state of organic waste and the decomposition state using microorganisms in the case of the existing anaerobic digester system, regardless of the state of organic waste introduced and the state of microbial decomposition. Every effort has been made to develop a system capable of producing biogas with high efficiency at all times. As a result, the biogas transcript produced in the biogas transcriptant production system including a microwaste culture apparatus for cultivating microorganisms using a negative waste water fermentation tank, an oil removal device, a refinement thickener, and the produced biogas transcriptant as a substrate. The present invention was completed by discovering that the sludge reduction and biogas production can be maximized when the organic waste is decomposed by entering the anaerobic digester.

Accordingly, an object of the present invention is to provide a biogas transcript production system using negative wastewater.

In addition, another object of the present invention is to provide a refining and concentrating device for a biogas thickener production system using negative wastewater.

Other objects and advantages of the present invention will become apparent from the following detailed description, claims and drawings.

The present invention provides a biogas oxidizer production system.

The inventors of the present invention focus on being affected by the production rate of biogas according to the state of organic waste and the decomposition state using microorganisms in the case of the existing anaerobic digester system, regardless of the state of organic waste introduced and the state of microbial decomposition. Every effort has been made to develop a system capable of producing biogas with high efficiency at all times. As a result, the biogas transcript produced in the biogas transcriptant production system including a microwaste culture apparatus for cultivating microorganisms using a negative waste water fermentation tank, an oil removal device, a refinement thickener, and the produced biogas transcriptant as a substrate. When the organic waste is decomposed into the anaerobic digester, the sludge reduction and biogas production can be maximized.

According to an aspect of the present invention, the present invention is a biogas transcriptant production system using negative wastewater to produce a biogas transcriptant to be added to the anaerobic digester, mixing the introduced wastewater and culture medium produced in the microbial culture apparatus Negative waste fermentation tank to ferment, oil removal device to remove oil and suspended solids contained in the effluent, refined concentration device to produce biogas oxidizer by concentrating the purified effluent from oil removal and produced biogas oxidizer It provides a biogas transcriptant production system using negative wastewater containing a microbial culture apparatus for culturing microorganisms.

As used herein, the term “digestion tank” may refer to a structure in which a stirrer, a sludge injector, a gas discharge pipe, etc. are installed inside a closed tank structure to obtain waste gas and fuel gas.

The term "biogas" as used herein may refer to any gas produced by fermentation or decay of a medium containing organic matter.

As used herein, the term “anaerobic bacteria” may refer to bacteria that do not require oxygen in the air.

As used herein, the term "negative wastewater" may refer to wastewater generated from food waste.

As used herein, the term "biogas transcriptant" may mean any substance that can increase biogas production as compared to the case where a particular substrate is not added to a specific microorganism.

According to a preferred embodiment of the present invention, the oil removal device of the present invention can remove the oil and suspended solids contained in the negative waste water using a filtration membrane is preferably formed pores of 1 ㎛ or less.

According to a preferred embodiment of the present invention, the oil removal device of the present invention is preferably composed of a lower frame and a top frame, and the negative waste water transported by the collection pipe is filtered using a filtration membrane having pores of 1 μm or less. Can be.

In the present invention, it is very important to remove oil and suspended solids using a filtration membrane. This is because, when the oil and suspended substances contained in the negative wastewater are removed using the filtration membrane, the negative wastewater treatment speed is high, the manufacturing cost is low, and the filtration membrane is easily washed.

According to a preferred embodiment of the present invention, the tablet concentrating device of the present invention may be preferably purified and concentrated using a rotary filter membrane of Pore size 1 ~ 1,000 nm to extract the transcriptant component.

In the present invention, it is very important to extract the transcriptant component by purifying and concentrating the negative wastewater from which oil has been removed using a rotary filtration membrane. This is because, when the biogas transcript is extracted from the wastewater from which oil is removed by rotating the filtration membrane, the biogas transcript extracting efficiency may be increased, and the filtration membrane may be easily washed.

According to a preferred embodiment of the present invention, the tablet thickening apparatus of the present invention may preferably further include a citric acid storage tank and a time constant storage tank into which citric acid and time constant may be added.

In the present invention, additionally including the citric acid storage tank and the time constant storage tank is a very important configuration. This is because, when citric acid and the time constant water is used as the washing water, the continuous operation of the refiner concentrate is possible, and the maintenance is easy.

According to a preferred embodiment of the present invention, the tablet concentrating device of the present invention may further include an air compressor which is an air injection device to minimize the impact load of the filtration membrane during filling or drainage.

In the present invention, additionally including the air compressor is a very important configuration. This is because, when the filling or drainage is made by the internal pressure controlled by the air compressor, the impact load on the filtration membrane can be minimized as compared with the filling or draining by the outside pressure.

According to a preferred aspect of the present invention, the negative wastewater fermenter of the present invention preferably includes a body for culturing microorganisms, a temperature control device for temperature control, a manhole for maintenance and a circulation pump for internal circulation and mixing Can be.

According to another aspect of the present invention, the present invention provides a purification concentrate device for a biogas oxidizer production system using negative wastewater, the negative wastewater input unit for storing negative wastewater, the negative wastewater is supplied through a supply pipe and a pump for purification A concentrated concentrate extracting a transcriptant and filtering using a plurality of rotary filtration membranes rotated by a motor, a compressed air supply unit supplying compressed air to the refined concentration unit to discharge negative wastewater in the refined concentrate unit; It provides a tablet thickening apparatus for a biogas thickener production system using a negative waste water including a transcript storage unit for receiving and storing the filtered oxidizer from the tablet concentrate.

According to a preferred embodiment of the present invention, the rotary filtration membrane of the present invention may be preferably a plurality of octagonal rotary filtration membranes bonded to two different hollow shafts are overlapped with each other.

According to a preferred embodiment of the present invention, the purification concentrate device for a biogas transcript production system using the negative wastewater of the present invention preferably further includes a wash water storage unit for receiving and storing an oxidizer or a time constant water of the transcript storage unit. Can be.

According to a preferred embodiment of the present invention, the purification concentrate device for a biogas transcript production system using the negative wastewater of the present invention is preferably branched from the supply pipe to supply and spray the washing water of the washing water storage unit to the filtration membrane of the purification concentration unit. It may further include a washing line and a nozzle.

The features and advantages of the present invention are summarized as follows:

(a) The present invention is a biogas transcriptant production system using negative wastewater to produce a biogas transcript for injection into the anaerobic digester, a negative wastewater fermented by mixing the introduced negative wastewater and the culture solution produced in the microbial culture apparatus Fermentation tank, oil removal device for removing oil and suspended solids in the wastewater, refinery concentrating device to produce biogas oxidizer by refining and concentrating the effluent from oil removal, and microorganisms cultivating microorganisms with the produced biogas transcriptant It provides a biogas oxidizer production system using a negative waste water containing a culture device.

(b) It provides an advantage of increasing the amount of biogas generated in the anaerobic digester by injecting a transcriptant produced using the system of the present invention into the anaerobic digester.

(c) When the wastewater is treated using the system of the present invention, it is possible to solve the problem of the scale problem due to the oil which may occur when the sewage water is merged, the increase in the treatment cost due to the increase in the concentration of hydrogen sulfide in the digester and the increase of sludge generation. That provides the benefits.

1 shows a conceptual diagram of a biogas transcript production system using the negative wastewater of the present invention.
Figure 2 shows a conceptual diagram of the oil removal apparatus included in the biogas transcript production system using the negative wastewater of the present invention.
Figure 3 shows a conceptual diagram of a purification thickener included in the biogas transcript production system using the negative wastewater of the present invention.
Figure 4 shows a conceptual diagram of a microbial culture apparatus included in the biogas transcript production system using the negative wastewater of the present invention.
5 shows a front view of the oil removal apparatus.
6 is a plan view of the oil removal apparatus.
7 shows a side view of the oil removal apparatus.
8 shows a conceptual diagram of a tablet thickener.
9 shows a partial detailed cross-sectional view of the tablet concentration unit included in the tablet concentration unit.
Figure 10 shows a cross-sectional configuration of the filter membrane applied to the tablet concentration unit included in the tablet concentration unit.
11 shows a batch form of the tablet concentration unit disfilter included in the tablet concentration unit.
12 shows a front view of the microorganism culture apparatus.
Figure 13 shows the experimental results showing the effect of the biogas oxidizer injection.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

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

1 to 4 illustrate a conceptual diagram of a biogas transcriptant production system using negative wastewater according to an embodiment of the present invention, a conceptual diagram of an oil removal device, a conceptual diagram of a refinement concentration device, and a conceptual diagram of a microbial culture device.

1 to 4, the biogas transcript production system using the negative wastewater according to an embodiment of the present invention includes a negative wastewater fermentation tank, oil removal device, purification concentration device and microbial culture device.

The fermentation broth fermentation broth fermentation broth and fermentation broth are fermented to the oil removal device.

The oil removal device removes oil and suspended solids through the pores of 1 μm or less of the oil contained in the negative wastewater.

Here, the negative wastewater from which oil and suspended substances are mostly removed is transferred to a refinery thickening unit, which is a post-stage process, using a metering pump.

The refinery thickener produces a biogas thickener by refining and concentrating the negative wastewater from which oil has been removed.

Tablet concentrator is a device that extracts the oxidizer components by purification, concentration using a rotary filter membrane of Pore size 1 ~ 1,000 nm.

The transpiration agent is rich in volatile fatty acids (VFAs) components such as acetic acid and contains a large amount of trace elements such as various minerals can help the microbial activity of the anaerobic digestion tank, contributing to the increase of biogas in the digestion tank.

The refinery thickener may include a citric acid storage tank and a time constant storage tank into which citric acid and time constant can be added for continuous operation and maintenance.

In addition, it may include an air compressor that is an air injection device to minimize the impact load of the filtration membrane during filling and draining.

Most of the produced biogas oxidizer is added to the anaerobic digester in the sewage treatment plant to increase the amount of biogas produced in the anaerobic digester, and part of the biogas transcript is used to prepare the culture solution.

The microbial culture apparatus is a culture apparatus capable of periodically supplying itself by culturing microorganisms that promote acid fermentation using the produced biogas transcriptant as a substrate. The microbial culture apparatus provides an advantage of reducing the cost of microbial medium purchase by using a biogas transcriptant as a medium.

5 to 7 are a front view, a plan view and a side view of the oil removal device included in the biogas oxidizer production system using negative wastewater according to an embodiment of the present invention.

5 to 7, the oil removal device according to an embodiment of the present invention is to support the filter membrane, the nipple A (1) and the nipple (2) for separating the filtration membrane, the collecting pipe (3) for transporting waste water, Inner frame support (4) and lower frame support (5), filtration membrane (6) for separating oil, filtration membrane support (7), supply line (8) for supplying air, filtration membrane support walkway (9), collection pipe support 10, the rubber packing 11 for preventing waste water leakage, hose 12, the oil separator bottom frame 13, the oil separator upper frame 14 is composed of.

8 to 11 is a conceptual diagram and the like of the purification concentration device included in the biogas transcript production system using the negative waste water according to an embodiment of the present invention.

8 and 9, the tablet concentrate according to an embodiment of the present invention is a negative waste water input unit 100 for storing the negative waste water, the negative waste water is supplied through the supply pipe 110 and the pump 120 Refining concentrate to extract the transcriptant, by using a plurality of rotary filtration membrane (210) rotated by a motor 220 for concentrating the tablet concentrate 200, by supplying compressed air to the tablet concentrate 200 The compressed air supply unit 300 for discharging the negative wastewater in the refined concentration unit 200, the oxidizer storage unit 400 for receiving and storing the oxidizing agent filtered from the refined concentration unit 200, the oxidant storage Washing water storage unit 500 to receive and store the water supply of the immersion unit 400, branched from the supply pipe 110 and the washing water of the wash water storage unit 500, the filtration membrane 210 of the tablet concentration unit 200 It consists of a washing line 510 and a nozzle 511 to supply and spray to the side.

Hereinafter, the configuration and operation of the preferred embodiment of the tablet thickening apparatus having a self-cleaning function configured as described above in more detail.

First, in order to filter the sludge, the effluent water from which the oil is removed through the negative waste water input unit 100 is supplied to the refinement concentration unit 200 through the valve V1, the supply pipe 110, and the pump 120.

The purification concentration unit 200 is a hollow shaft 230 is rotated by the motor 220, the rotating filtration membrane 210 is inserted into the center portion of the hollow shaft 230 is rotated.

10 is a cross-sectional configuration diagram of the filtration membrane 210.

Referring to FIG. 10, the rotary filtration membrane 210 includes a support 211 coupled to a side surface of the hollow shaft 230, a flow passage membrane 213 coupled to a space with a portion of the support 211, and the And a filter 212 positioned above the flow path film 213.

The hollow shaft 230, which is a side of the space provided between the support 211 and the flow path film 213, is provided with a supply port 231 through which the negative waste water from which oil is removed may be introduced.

In such a configuration, the supplied wastewater from which the oil is removed is filtered by the filter 212, and foreign matters of the wastewater from which the oil is removed remain at the top of the filter 212, and only liquid is used as the transcriptant. 212 is passed through the flow path film 213 and flows into the space formed by the flow path film 213 and the support 211, the introduced transpiration agent through the supply port 231 of the hollow shaft 230 Passed therein is stored in the oxidizer storage unit 400.

In this way, the foreign matter separated from the negative waste water is discharged to the outside through the foreign matter discharge port 250, when draining through the drain line 240, or to provide a separate discharge port on the upper portion of the refinery concentrate 200. Can be discharged through this outlet.

In this case, in order to increase the efficiency of the filtration, the air compressor 300 may supply compressed air to the inside of the filter 200, and may further promote separation of the foreign matter and the oxidizer by increasing the pressure. In this case, by connecting the pump 221 to the end of the hollow shaft 230, by driving the pump 221 to reduce the pressure inside the hollow shaft 230 to further improve the filtration efficiency in the filter 212 Can be.

The compressed air supplied by the air compressor 300 prevents the filter 212 from being damaged by the internal pressure reduction of the hollow shaft 230 and serves to facilitate the discharge of negative wastewater.

As the filtration process is repeated, the slurry is fixed to the upper portion of the filter 212. Of course, the rotation of the rotary filtration membrane 210 and the formation of turbulence by overlapping arrangement with the adjacent rotary filtration membrane 210 can reduce the adhesion of the slurry to the surface of the rotary filtration membrane 210, It is impossible to prevent sticking.

When the filtration efficiency is lowered due to the sticking of the slurry, the filtration process is stopped and a washing process for washing the slurry from the rotary filtration membrane 210 is performed.

To this end, in the state in which the valve V1 is closed, the valve V2 is opened, and the washing water of the washing water storage unit 500 is supplied through the pump 120 and the supply pipe 110, and the valve V6 is opened in the closed state. It is supplied to the washing line 510 through the valve V7, and is sprayed to the surface of each rotary filtration membrane 210 through a plurality of nozzles 511 coupled to the washing line 510.

At this time, the washing water may be sprayed at an appropriate pressure by the diameter of the nozzle 511 and the pressure of the pump 120 to remove the slurry. The wash water may be pure water, or may include a washing agent for ease of washing.

At this time, when the rotary filtration membrane 210 is rotated using the motor 220, the nozzle 511 coupled to the washing line 510 by the rotation of the rotary filtration membrane 210 is fixed of the filtration membrane 210 The whole can be washed.

The nozzle 511 is preferably provided with discharge ports on both sides so that the upper and lower surfaces of the adjacent filtration membrane 210 can be simultaneously washed.

11 is a configuration diagram of an embodiment showing the arrangement of the nozzle 511 that can be arranged according to the arrangement of the rotary filtration membrane 210.

Referring to FIG. 11, the filter 200 may be configured such that a plurality of octagonal rotary filtration membranes 210 coupled to two different hollow shafts 230 overlap each other, and the shape of the rotary filtration membrane 210 may be arranged. The present invention is not limited by the shape of a circle, an octagon, a hexagon, and the like.

In this arrangement, the plurality of nozzles 511 coupled to the washing water supply pipe 510 for supplying the washing water are positioned to overlap between the plurality of rotary filtration membranes 210, so that the nozzles 511 except for the most extreme and the most extreme end. They wash the upper and lower surfaces of each adjacent rotary filtration membrane 210 at the same time.

As described above, the nozzle 511 may be positioned to overlap the rotating filtration membranes 210 and may be positioned at a distance without overlapping.

In this case, the rotary filtration membranes 210 may be configured to rotate. Accordingly, the entire rotary filtration membrane 210 may be uniformly cleaned by the washing water sprayed from the nozzle 511.

In particular, the nozzle 511 is preferably in the form of pushing out the slurry fixed inclined to have an acute spray angle with respect to the surface of the rotary filtration membrane 210 to the outside.

In addition, the washing water used to wash the rotary filtration membrane 210 is discharged through the hollow shaft 230, such as the negative waste water during filtration is stored in the filtered water storage unit 400. In this case, the negative waste water stored in the negative waste water storage unit 400 may be configured to be stored in the wash water storage unit 500 again through the pump 410 and the valve V3.

This can save the washing water used for washing because it can be used as the washing water by circulating the negative waste water as well as the washing water.

In addition, the nozzle 511 is located between each of the rotary filtration membranes 210, it is preferable that the nozzle 511 and the rotary filtration membrane 210 is installed so as to overlap by a predetermined length as shown in FIG. According to this structure, when the rotary filtration membrane 210 rotates during filtration, fluid interference with the nozzle 511 occurs to generate turbulence, and the formation of the turbulence prevents foreign matter from adhering to the rotary filtration membrane 210. Thus, the filtration efficiency can be increased.

12 is a front view of the microbial culture apparatus included in the biogas transcript production system using the negative wastewater according to an embodiment of the present invention.

12, the microbial culture apparatus according to an embodiment of the present invention is a body 20 for culturing microorganisms, a temperature control device 30 for temperature control in the microbial incubator, a manhole 40 for maintenance, It consists of a circulation pump or agitator facility 50 for internal circulation and mixing.

Experimental Example: Verification of Biogas Thickener Effect

The effect of biogas transcriptant input on biogas production was confirmed. In the control group (no biogas nitrate added), 100% of the concentrated sludge was added, and the treatment group (putting the nitrate) was charged with 95% of the concentrated sludge and 5% of the biogas nitrate, based on 30 days of digestion under medium temperature anaerobic digestion. As a result of the experiment, the biogas generation amount of the treatment group fed with the transcriptant was 2.2 times higher than that of the control group. 10 days after the biogas transcriptant was added, the biogas generation rate was similar to that of the microorganism adaptor without the antacid addition, and after 16 days, the biogas generation rate was about 2 times different. As a result, gas was continuously generated.

division Gas generation amount (mL) Injecting nitrate 57,667 Addition of transcript 127,462 Increase rate 2.2x

Nipple A 1 Nipple 2
Sump 3 Internal frame support 4
Lower support 5 Filtration membrane 6
Filtration Support 7 Supply Line 8
Filtration Support Sidewalk 9 Sump Supporter 10
Rubber packing 11 Hose 12
Oil Separator Upper Frame 13 Oil Separator Upper Frame 14
Body 20 Thermostat 30
Manhole 40 Agitator Facility 50
Input 100 Supply Line 110
Pump 120 Tablet Concentrator 200
Rotary filtration membrane 210 motor 220
Compressed air supply 300 Decanter storage 400
Washing water reservoir 500 Cleaning line 510
Nozzle 511

Claims (10)

In the biogas transcriptant production system using negative wastewater to produce a biogas transcriptant to be injected into the anaerobic digester,
Negative waste fermentation tank, which ferments by mixing fermented effluent water and culture medium produced in microbial culture device,
Oil removal device for removing oil and suspended solids contained in drinking water,
Refining concentrating device for producing biogas oxidizer by refining and concentrating the demineralized wastewater;
Including a microbial culture apparatus for culturing the microorganisms produced biogas transcriptant,
The oil removal device removes oil and suspended solids contained in the negative waste water by using a filtration membrane having pores of 1 μm or less,
The tablet concentrator is purified using a rotary filter membrane of Pore size 1 ~ 1,000nm, concentrated to extract the transcriptant component,
Some of the produced biogas oxidizer is added to the microbial culture apparatus to be used for producing the culture solution.
Biogas Thickener Production System Using Drinking Water.
delete The method of claim 1,
The oil removal device is composed of the lower frame and the upper frame, biogas transcriptant production system using the negative waste water, characterized in that the filtration of the negative waste water transported by the collection pipe using a filtration membrane formed with pores of 1 ㎛ or less.
delete The method of claim 1,
The refining and concentration device further comprises a citric acid storage tank and a time constant storage tank into which citric acid and time constant may be added.
The method of claim 5,
The purification concentrating device further comprises an air compressor, which is an air injection device, to minimize the impact load of the rotary filtration membrane when filling or draining.
The method of claim 6,
The negative waste water fermentation tank is a biogas oxidizer production system using negative waste water, characterized in that it comprises a body for culturing microorganisms, a temperature control device for temperature control, a manhole for maintenance and a circulation pump for internal circulation and mixing .


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