KR102099065B1 - Manufacturing method for fuel using food waste and fuel manufactured using the same - Google Patents

Abstract

The present invention relates to a method for producing fuel using food waste and fuel produced thereby. According to an embodiment of the present invention, the method for producing fuel comprises the following steps: preparing a mixture by bringing food waste and an excipients into contact with each other; preparing a primary fermentation product by adding a mixed strain to the mixture and performing primary fermentation; preparing a second fermentation product by subjecting the first fermentation product to second fermentation at a temperature of 70°C or higher; and preparing a tertiary fermentation product by subjecting the secondary fermentation product to tertiary fermentation at a temperature of 130°C or higher.

Description

Method for manufacturing fuel using food waste and fuel produced thereby {MANUFACTURING METHOD FOR FUEL USING FOOD WASTE AND FUEL MANUFACTURED USING THE SAME}

The present invention relates to a fuel manufacturing method using food waste and fuel produced thereby. More specifically, the present invention relates to a fuel manufacturing method using food waste and a fuel produced thereby.

Conventionally, organic wastes such as food wastes have been buried, but recently, foreign matters mixed with food wastes have been selected and subjected to dehydration, drying, and crushing processes to produce and recycle feed and compost.

On the other hand, wastewater or permeate generated in the process of dehydrating food waste is called food waste desorption liquid, which is a high-concentration malignant wastewater in which high concentrations of organic matter, CO ₂ , hydrogen sulfide and ammonia are mixed in a large amount, which is difficult to purify and costs for purification. Although it was high, it was discharged through ocean dumping while recognizing its seriousness.

On the other hand, food waste generated at home is removed from the waste container by removing moisture, and a certain amount of food waste from which water is removed is dissolved and a desalination solution is generated. The food waste container was collected by a company, and the dissolved desorption liquid was separated, the food waste was put into a machine, dried, and used as fertilizer, and the separated desorption liquid was used to purify in the septic tank facility.

In the septic tank facility, the desorption liquid is fermented and discharged after various filtration processes. Such a fermentation and filtration process is very complicated, and there is a problem that it takes a lot of time and facility cost to complete fermentation. If the untreated fermentation liquor is discharged, it may cause serious environmental pollution and destruction of the ecosystem.

As a conventional treatment for food desorption, there is a method of treatment using microorganisms. As for the treatment method using the microorganism, an anaerobic treatment method for hydrolysis, acid fermentation, and methane fermentation using an anaerobic microorganism is in operation, but the treatment period takes more than 20 days and requires long-term storage. There is a drawback in that it is essential to require an operation, and the operating conditions are difficult, and as a fundamental problem, there is a disadvantage in that the treatment efficiency of the desorption liquid that has passed the anaerobic process is low. In addition, the microbial treatment method was vulnerable to the occurrence of odor.

Background art related to the present invention is disclosed in Republic of Korea Patent Publication No. 2019-0120637 (published on October 24, 2019, the name of the invention: a method for manufacturing solid fuel using food waste).

One object of the present invention is to provide a fuel manufacturing method having high use value as a fuel because of excellent combustion efficiency and calorific value using food waste.

Another object of the present invention is to provide a method for producing fuel capable of treating the desorption liquid (moisture) of food waste without going through a purification facility.

Another object of the present invention is to provide a fuel manufacturing method excellent in removing pollutants and removing moisture from food waste.

Another object of the present invention is to provide a fuel manufacturing method having excellent effect of reducing food waste treatment cost and treatment time.

Another object of the present invention is to provide a fuel manufacturing method that can effectively prevent the occurrence of odor and environmental pollution.

Another object of the present invention is to provide a fuel manufactured using the fuel manufacturing method.

One aspect of the present invention relates to a fuel manufacturing method using food waste. In one embodiment, the method for producing fuel comprises preparing a mixture by contacting food waste and excipients; Preparing a primary fermentation product by introducing a mixed strain to the mixture and performing primary fermentation; Preparing a second fermentation product by subjecting the first fermentation product to a second fermentation at a temperature of 70 ° C. or higher; And a third fermentation of the secondary fermentation product at a temperature of 130 ° C. or higher to produce a tertiary fermentation product, wherein the excipients are fermented with beet pulp, corncobs, cotton wool, sawdust and food waste. Contains at least one of the dried products, the mixed strains Bacillus subtilus ( bacillus subtillis ), Lactobacillus acidophilus ( Lactobacillus acidophilus ), Saccharomyces cerevisiae ( Saccharomyces cerevisiae ), Lactobacillus plantarum ( Lactobacillus) plantarum ) and Rhodopseudomonas capsulata .

In one embodiment, the mixed strain is Bacillus subtilus, Lactobacillus acidophyllus, Saccharomyces cerevisiae, Lactobacillus plantarum, and Rhodopsudomonas capsule raptors 1: 2-4: 2-4: 1 to 5: 2 to 6 weight ratio.

In one embodiment, after the step of preparing the tertiary fermentation, producing a quaternary fermentation product by subjecting the tertiary fermentation to a fourth fermentation at 35 to 50 ° C; And molding the fourth fermentation product.

In one embodiment, the mixture may include 50 to 85% by weight of food waste and 15 to 50% by weight of excipients.

In one embodiment, the mixture may have a water content of 50 to 70%.

In one embodiment, the excipient may include beet pulp, corncobs, cotton peel and sawdust in a weight ratio of 1: 1 to 3: 2 to 4: 2 to 8.

Another aspect of the invention relates to a fuel manufactured using the fuel manufacturing method.

The fuel manufacturing method using food waste according to the present invention and the fuel produced thereby have high combustion efficiency and calorific value using food waste, so that the value as a fuel is high, and it is possible to treat food waste desorption without going through a purification facility. , It has an excellent effect of removing pollutants from food waste and removing moisture, and has an excellent effect of reducing food waste treatment cost and processing time, and can effectively prevent odor and environmental pollution.

1 shows a fuel manufacturing method according to an embodiment of the present invention.

In the description of the present invention, when it is determined that detailed descriptions of related known technologies or configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice, and thus the definition should be made based on the contents of the present specification describing the present invention.

Method for manufacturing fuel using food waste

One aspect of the present invention relates to a fuel manufacturing method using food waste. 1 shows a fuel manufacturing method according to an embodiment of the present invention. Referring to Figure 1, the fuel manufacturing method (S10) mixture preparation step; (S20) primary fermentation step; (S30) secondary fermentation product manufacturing step; And (S40) tertiary fermentation step.

More specifically, the fuel manufacturing method (S10) preparing a mixture by contacting food waste and excipients; (S20) preparing a primary fermentation product by introducing a mixed strain to the mixture and performing primary fermentation; (S30) preparing a secondary fermentation product by secondary fermentation of the primary fermentation product at a temperature of 70 ° C. or higher; And (S40) the third fermentation of the secondary fermentation product at a temperature of 130 ° C. or higher to prepare a tertiary fermentation product.

Hereinafter, a method of manufacturing fuel using the food waste will be described in detail step by step.

(S10) Mixture manufacturing step

The above step is a step of preparing a mixture by contacting food waste and excipients.

The excipients include one or more of beet pulp, corncob, cottonseed, sawdust and food waste fermentation products. When the excipients are included, the water absorption effect contained in the food waste is excellent, the moldability is excellent when producing fuel, and the heat generation property of the fuel can be excellent.

The beet pulp is also called beetroot, and can be used by extracting sugar from sugar beet and drying the remaining by-products. For example, beet pulp pellets obtained by extracting sugar from the sugar beet and drying the remaining by-products into a pellet form may be used. When the beet pulp is included, the moisture absorption effect contained in the food waste is excellent, and the moldability may be excellent when manufacturing fuel.

The corn stalk may use a stem portion of a corn plant. For example, corn stalk pellets in which a stem portion of a corn plant is shaped into pellets may be used.

The cottonseed peel may use the peel of the peeled cottonseed to obtain cottonseed oil. For example, cotton peel pellets formed by molding the shell of the cotton seed into pellets may be used.

The sawdust may be used in an average size of 0.1 ~ 10mm conditions. The size may mean the maximum size of the sawdust.

The food waste fermentation dried product can be used by fermenting and drying conventional food wastes to form pellets.

The mixture may include 50 to 85% by weight of food waste and 15 to 50% by weight of excipients. When included in the above range, it is possible to easily absorb the moisture of the food waste, excellent mixing property between the excipient and the food waste, it may be excellent in the heat generation of the produced fuel.

In one embodiment, the food waste has a water content of 80 to 95%, and the water content of the mixture prepared by mixing with the excipient may be 50 to 70%. Decomposition and fermentation activity of food wastes by the mixed strain at the water content of the above conditions may be actively generated.

In one embodiment, the excipient may include beet pulp, corncobs, cotton peel and sawdust in a weight ratio of 1: 1 to 3: 2 to 4: 2 to 8. When included in the weight ratio range, the water absorbing effect of the food waste is excellent, the mixing property and dispersibility between the excipient component and the food waste is excellent, and the heat generation property of the fuel may be excellent. For example, the excipients may be included in a weight ratio of 1: 2 to 3: 2 to 3: 3 to 5.

(S20) Primary fermentation product manufacturing step

The above step is a step of preparing a primary fermentation product by introducing a mixed strain to the mixture and performing primary fermentation.

The mixed strains are Bacillus subtillis , Lactobacillus acidophilus , Saccharomyces cerevisiae , Lactobacillus plantarum , and Rhodo pseudomonas capsule lay Rhodopseudomonas capsulata . When the mixed strain of the above-mentioned type is included, food waste can be decomposed in a short time, and odor removal efficiency generated from food waste may be excellent.

In one embodiment, the content of the rhodopsudomonas encapsulator may be higher than that of the Bacillus subtilus, Lactobacillus acidopilus, Saccharomyces cerevisiae, and Lactobacillus plantarum.

In one embodiment, the content of the Lactobacillus plantarum may be higher than that of the Bacillus subtilus, Lactobacillus acidophilus, and Saccharomyces cerevisiae.

In one embodiment, the Saccharomyces cerevisiae may be higher than the Bacillus subtilus content.

In one embodiment, the mixed strain is Bacillus subtilus, Lactobacillus acidophyllus, Saccharomyces cerevisiae, Lactobacillus plantarum, and Rhodopsudomonas capsule raptors 1: 2-4: 2-4: 1 to 5: 2 to 6 weight ratio. When included in the weight ratio range, the unpredictable synergistic effect between the components of the mixed strain is excellent, so that food waste decomposition efficiency is excellent, and odor removal efficiency may be excellent. For example, the mixed strains include Bacillus subtilus, Lactobacillus acidopilus, Saccharomyces cerevisiae, Lactobacillus plantarum, and Rhododocudomonas capsule raptors 1: 2 to 3: 2 to 3: 1. ~ 3: 3 to 5 weight ratio.

In one embodiment, the mixed strain may be added in the form of a liquid.

In one embodiment, the mixed strain may be included in an amount of 0.01 to 0.5 parts by weight based on 100 parts by weight of the mixture. When introduced into the above range, the decomposition efficiency of the food waste may be excellent.

In one embodiment, the primary fermentation product may be prepared by adding the mixture and the mixed strain and fermenting for 15 to 30 hours. Under the above conditions, the mixed strain can proliferate, and the primary fermentation can be easily performed.

(S30) Secondary fermentation product manufacturing step

In the above step, the primary fermentation product is secondary fermented at a temperature of 70 ° C. or higher to prepare a secondary fermentation product. When the second fermentation is performed at a temperature of less than 70 ° C, fermentation by the mixed strain does not easily occur, and the effect of removing odor may be reduced. For example, it can be fermented at 80-95 ° C.

For example, the secondary fermentation may be performed at a temperature of 70 ° C or higher for 30 hours or longer. Under the above conditions, when the secondary fermentation, the decomposition and fermentation effect of the primary fermentation product may be excellent. For example, the secondary fermentation, the primary fermentation can be carried out at 80 ~ 95 ℃ for 30-50 hours.

(S40) 3rd fermentation product manufacturing step

The step is a step of tertiary fermentation of the secondary fermentation product at a temperature of 130 ° C. or higher to prepare a tertiary fermentation product. When the secondary fermentation is performed at a temperature of less than 130 ° C., fermentation by the mixed strain does not easily occur, the odor removal effect is reduced, and fuelization is not achieved, so that the calorific value during fuel production may be reduced. For example, it can be fermented at 150 to 200 ° C.

For example, the tertiary fermentation may be performed at a temperature of 130 ° C or higher for 30 hours or longer. When the tertiary fermentation is performed under the above conditions, the decomposition and fermentation effect of the secondary fermentation product is excellent, fuelization is easily performed, and an odor removal effect can be excellent. For example, the tertiary fermentation may be performed by fermenting the secondary fermentation product at 150 to 200 ° C. for 30 to 60 hours.

After the step of preparing the tertiary fermentation in one embodiment of the present invention, (S50) quaternary fermentation production step; And (S60) molding step; may further include.

(S50) 4th fermentation product manufacturing step

The above step is a step of preparing a fourth fermentation product by subjecting the third fermentation product to the fourth fermentation at 35-50 ° C. Under the above conditions, fermentation by the mixed strain can easily occur. For example, it can be fermented at 35 to 45 ° C.

(S60) Molding step

The step is a step of molding the fourth fermentation product. For example, the fourth fermentation product may be transferred to a storage tank to remove foreign substances such as metal, and then pelletized to produce a pellet-shaped molded body. The manufactured pellet-type fuel is packaged and shipped.

Fuel manufactured by the fuel manufacturing method using food waste

Another aspect of the invention relates to a fuel produced by the fuel manufacturing method using the food waste.

In the present invention, the fuel may be used alone or as a fuel aid to mix with existing fossil fuels. When used in combination with fossil fuels, the mixing ratio can be adjusted in consideration of the cost and cost of purchasing fossil fuels.

In addition, the fuel of the present invention can be produced by further comprising at least one of waste lime, waste coal and low-quality coal. The low quality coal has a calorific value of less than 3000 kcal / kg, and anthracite coal, graphite coal, and other similar mineral materials may be used.

In one embodiment, it may further include 5 to 30 parts by weight of waste lime, waste coal or low quality coal with respect to 100 parts by weight of the fuel. Preferably 5 to 15 parts by weight may be further included.

In one embodiment, the water content of the fuel is 3 to 10% by weight, volatile matter and fixed carbon are included in a weight ratio of 1: 0.5 to 1: 1.5, and the calorific value may be 2,000 to 8,000 kcal / kg.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is provided as a preferred example of the present invention and cannot be interpreted as limiting the present invention by any means. The contents not described here will be sufficiently technically inferred by those skilled in the art, and thus the description thereof will be omitted.

Examples and comparative examples

The mixed strains used in Examples and Comparative Examples are as follows.

Mixed strains (1): Bacillus subtillis , Lactobacillus acidophilus , Saccharomyces cerevisiae , Lactobacillus plantarum , and Rhodopsudomonas A mixed strain in the form of a liquid was prepared, which contains a capsule ratio ( Rhodopseudomonas capsulata ) in a weight ratio of 1: 2: 2: 3: 4.

Mixed strain (2): Lactobacillus acidophyllus, Saccharomyces cerevisiae, Lactobacillus plantarum, and Rhodo Pseudomonas capsule strainer in a liquid form containing a 1: 1: 1.5: 2 weight ratio I prepared.

Mixed strain (3): A mixed strain in a liquid form was prepared comprising Bacillus subtilus, Saccharomyces cerevisiae, Lactobacillus plantarum, and Rhodopseudomonas capsule raptor in a 1: 2: 3: 4 weight ratio. .

Mixed strain (4): A mixed strain in a liquid form was prepared comprising Bacillus subtilus, Lactobacillus acidopilus, Lactobacillus plantarum, and Rhodopseudomonas capsule latter in a 1: 2: 3: 4 weight ratio.

Mixed strain (5): Prepare a mixed strain in a liquid form containing Bacillus subtilus, Lactobacillus acidophilus, Saccharomyces cerevisiae, and Lactobacillus plantarum in a weight ratio of 1: 2: 2: 3. Did.

Example 1

Contact and mix 75% by weight of food waste (water content of 90% by weight) and 25% by weight of excipients (including beet pulp pellets, corncob pellets, cottonseed pellets, and sawdust 1: 2-3: 2-3: 5-6 weight ratio) To prepare a mixture (water content of 60% by weight).

Then, about 10 tons of the mixture, 20 kg of the mixed strain (1) was added and mixed to perform primary fermentation for 1 day to prepare a primary fermentation product. Then, the primary fermentation product was secondarily fermented at 80 to 95 ° C for 48 hours to prepare a secondary fermentation product, and then the secondary fermentation product was fermented at 160 to 185 ° C for 48 hours for 3 hours to tertiary fermentation. Fermentation was prepared.

Subsequently, the tertiary fermentation product is fermented for 4 hours at 40-50 ° C. for 4 hours to prepare a quaternary fermentation product, and the quaternary fermentation product is transferred to a storage tank to remove foreign substances such as metals and inorganic substances. The pellets were transported to a pellet molding machine to produce pellet fuel.

Example 2

Fuel was prepared in the same manner as in Example 1, except that an excipient containing beet pulp pellets, corncob pellets, and sawdust in a weight ratio of 1: 1 to 2: 5 to 6 was applied.

Comparative Example 1

Fuel was prepared in the same manner as in Example 1, except that the mixed strain (2) was applied.

Comparative Example 2

Fuel was prepared in the same manner as in Example 1, except that the mixed strain (3) was applied.

Comparative Example 3

Fuel was prepared in the same manner as in Example 1, except that the mixed strain (4) was applied.

Comparative Example 4

Fuel was prepared in the same manner as in Example 1, except that the mixed strain (5) was applied.

Comparative Example 5

Fuel was prepared in the same manner as in Example 1, except that the primary fermentation product was prepared by secondary fermentation at 65 ° C for 48 hours to produce a secondary fermentation product.

Comparative Example 6

A fuel was prepared in the same manner as in Example 1, except that the secondary fermentation product was produced by tertiary fermentation at 115 ° C for 48 hours to prepare a tertiary fermentation product.

Experimental example

The fuels of Examples 1 to 2 and Comparative Examples 1 to 6 were evaluated for the following items.

(1) Low calorific value (kcal / kg) and moisture content (%): Examples and comparative examples are shown in Table 1 below by measuring low calorific value and water content for fuel.

(2) Mixability and moldability: Examples and Comparative Examples Dispersibility of components, mixing ability and moldability at the time of pellet molding during fuel production were evaluated using the following four criteria and the results are shown in Table 1 below ( ◎: Very good, ○: Good, △: Bad, X: Very bad).

(3) Measurement of odor gas components (ppm): The fuels of the above examples and comparative examples were respectively charged into a odor analysis container, the odor removal treatment was filled into the container, and then the container was sealed to stand for 24 hours. Did. Then, the concentration of each malodor component of hydrogen sulfide, dimethyl sulfide, methyl mercaptan, and ammonia in the container was analyzed using a detection tube, and the results are shown in Table 2 below.

Referring to the results of Tables 1 and 2, Examples 1 to 2 of the present invention had better calorific value than Comparative Examples 1 to 6, and had excellent dispersibility, mixing property, and moldability during pellet formation in fuel production. . In addition, it was found that Examples 1 to 2 had better odor removal effect of food waste than Comparative Examples 1 to 6 outside the present invention.

So far, the present invention has been focused on the embodiments. Those skilled in the art to which the present invention pertains will appreciate that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in terms of explanation, not limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent range should be interpreted as being included in the present invention.

Claims (7)

Preparing a mixture by contacting food waste and excipients;
Preparing a primary fermentation product by introducing a mixed strain to the mixture and performing primary fermentation;
Preparing a second fermentation product by subjecting the first fermentation product to a second fermentation at a temperature of 70 ° C. or higher; And
Including the step of preparing a tertiary fermentation product by tertiary fermentation of the secondary fermentation product at a temperature of 130 ° C.
The excipients include beet pulp, corncob, cotton peel and sawdust in a weight ratio of 1: 1 to 3: 2 to 4: 2 to 8,
The mixed strains are Bacillus subtillis , Lactobacillus acidophilus , Saccharomyces cerevisiae , Lactobacillus plantarum , and Rhodo pseudomonas capsule lay Method for producing fuel using food waste, characterized in that it contains another ( Rhodopseudomonas capsulata ).
The method of claim 1, wherein the mixed strain is Bacillus subtilus, Lactobacillus acidophilus, Saccharomyces cerevisiae, Lactobacillus plantarum, and Rhodo Pseudomonas capsule raptors 1: 2-4: 2 ~ 4: 1 ~ 5: 2 ~ 6 fuel production method using food waste, characterized in that it comprises a weight ratio.
According to claim 1, After the step of preparing the tertiary fermentation product,
Preparing a fourth fermentation product by subjecting the third fermentation product to a fourth fermentation at 35 to 50 ° C; And
Molding the fourth fermentation product; Fuel production method using food waste, characterized in that it further comprises.
The method of claim 1, wherein the mixture is 50 to 85% by weight of food waste and 15 to 50% by weight of excipients fuel production method using food waste.
The method of claim 1, wherein the mixture is a fuel manufacturing method using food waste, characterized in that the water content is 50 to 70%.
delete The fuel produced by the fuel manufacturing method using the food waste of any one of claims 1 to 5.

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