KR20220032998A - Manure of livestock resourceization device and method - Google Patents

Abstract

The present invention relates to an apparatus for repurposing livestock waste as a resource and a method therefor. The apparatus for repurposing livestock waste as a resource comprises: a stirring unit for removing impurities precipitated while stirring livestock waste; a solid-liquid separation unit for separating the livestock waste supplied from the stirring unit into a livestock waste cellulose component and an organic component with reference to a predetermined solid size through centrifugation; and a pulping unit for producing pulp by pressurizing and pulping the livestock cellulose component to produce the pulp. The stirring unit performs a stirring operation and a stop operation with respect to the mixture in which water and a surfactant are added to the livestock waste, and removes impurities precipitated during the stop operation from the mixture. According to the present invention, excellent pump can be obtained by removing an organic component from livestock waste.

Description

Apparatus for recycling livestock and method therefor

The present invention relates to an apparatus for recycling livestock manure and a method therefor, and more particularly, to a technology for producing pulp from cellulose extracted from livestock manure.

With the recent development of the livestock industry, livestock farms continue to grow in size, resulting in a large amount of livestock manure (livestock manure), and environmental pollution and odor problems are emerging as social problems.

Cattle manure, which accounts for the majority of the above-mentioned livestock manure problem, is cattle manure. After cattle ingest various herbaceous plants as food, most of them are excreted as cow manure. Here, organic components are the main cause of soil and water pollution, and in particular, after the Marine Pollution Prevention Act that prohibits the discharge of livestock manure to the sea was implemented, organic components of livestock manure were composted to solve the problem by attempting to convert livestock manure into resources.

However, the majority of cow manure, about 60%, is a herbaceous plant excreted in a micronized state, and 80% of it is cellulose, which is fibrous, but it is difficult to use as compost, so there was a limit to the above attempts to convert livestock manure into resources. Therefore, as a method of utilizing such a significant amount of cellulose, a method of solidifying it in the form of pellets and using it as a solid fuel has been proposed. However, in the case of the prior art (KR 10-1024527) for manufacturing a solid fuel from livestock, organic components in the livestock do not burn and remain in the form of ash, which does not show a constant heat of combustion or does not obtain sufficient calorific value. I had a problem that was difficult to do.

The present invention discloses a method for separating an organic component from livestock and preparing a pulp using the separated cellulose component as a raw material.

An embodiment of the livestock manure recycling apparatus according to the present invention comprises: a stirring unit for removing impurities precipitated while stirring the livestock; a solid-liquid separation unit that separates the livestock meal supplied from the stirring unit into a dry cellulosic component and an organic component based on a predetermined solid size through centrifugation; and a pulping unit for producing pulp by pressurized pulping the cellulose component, wherein the stirring unit performs stirring and stopping operations for the mixture in which water and surfactant are added to the livestock, and is precipitated during the stopping operation Impurities are removed from the mixture.

It may further include a composting unit for composting the organic component.

It may further include a first drying unit for drying the livestock and supplying it to the stirring unit.

The predetermined solid size may be 200 Mesh.

It may further include a pre-processing unit for pulverizing the livestock meal, removing impurities from the pulverized livestock meal with a screen filter, and supplying the pulverized livestock meal to the stirring unit.

The pulping unit may use one of pressurized pulping methods of kraft pulping, sulfite pulping, alkaline sulfite pulping, and soda pulping.

It may further include a bleaching unit for bleaching the prepared pulp.

In the mixture, the amount of water may be greater than 300 to less than 1000 parts by weight based on 100 parts by weight of the livestock powder.

It may further include a second drying unit for drying the moistened cellulose component, wherein the pulping unit pressurizes the moistened cellulose component dried by the second drying unit.

The dried moistened cellulose component may have a moisture content of 10% by weight or less.

Another embodiment of the present invention is a pre-treatment step of pulverizing dried livestock and removing impurities with a screen filter; A stirring step of removing impurities precipitated while stirring the livestock that has undergone the pretreatment step; a solid-liquid separation step of separating the livestock powder that has undergone the stirring step into an animal fat cellulosic component and an organic component based on a predetermined solid size through centrifugation; and a pulping step of producing pulp by pressure-pulping the fermented cellulose component, wherein the stirring step performs a stirring operation and a stopping operation on the mixture in which water and a surfactant are added to the livestock meal, and during the stopping operation Precipitating impurities are removed from the mixture.

It may further include a composting step of composting the organic component.

According to the present invention, excellent pulp can be obtained by removing organic components from livestock.

2 is a flowchart of a method for recycling livestock according to the present invention.
3 is a photograph of the hygroscopic cellulose component according to the present invention.
4 is a photograph of the dried moistened cellulose component according to the present invention.
5 is a photograph of the pellet solid fuel of the hygroscopic cellulose component according to the present invention.
6 is a flowchart of another method for reclaiming livestock according to the present invention.

A preferred embodiment of the present invention will be described in more detail, but the already known technical parts will be omitted or compressed for the sake of brevity of description.

As shown in FIG. 1 , the livestock manure recycling apparatus according to the present invention includes a stirring unit 300 , a solid-liquid separation unit 400 , and a mixing molding unit 600 .

The stirring unit 300 removes impurities that are precipitated by stirring the livestock. Specifically, the stirring unit 300 performs stirring on the mixture in which water is added to the livestock meal, and the amount of water may be greater than about 300 to less than 1000 parts by weight based on 100 parts by weight of the supplied livestock meal. The stirring unit 300, for example, after stirring for 30 minutes may repeat a process leading to a stop operation for 1 hour to repeat three times. During the stirring operation, the damp cellulose component and the organic component included in the livestock meal may be partially separated, and during the stop operation, heavy impurities such as sand, soil or metal chips that may be included in the livestock meal may be precipitated. On the other hand, light weight impurities may be suspended in the mixture. Precipitated impurities or floating impurities may be removed through a removal device for removing impurities that may be included in the stirring unit 300 .

Preferably, an appropriate amount of a surfactant is added to the mixture to facilitate separation of the moist cellulose component and the organic component.

Before being supplied to the stirring unit 300 , the livestock meal may be dried in advance according to a general livestock storage treatment method or may be separately dried by the first drying unit 100 . It is preferable that the dried livestock powder has a moisture content of less than about 40% by weight, so that the moisture does not stick to the hand.

In addition, before being supplied to the stirring unit 300 , the livestock meal is pre-pulverized through the pre-processing unit 200 , and then impurities such as general earth lumps, metal and plastic pieces may be removed with a screen filter for pretreatment. The screen filter has a filter air gap of 5 to 20 mm, and can remove impurities of 20 mm or more from the livestock.

The solid-liquid separation unit 400 may separate the cellulose component, organic component, water, and the like, contained in the livestock meal through the centrifugal separation principle. The solid-liquid separation unit 400 can separate the mixture that has passed through the stirring unit 300 into a solid and a liquid material having a specific gravity difference by using a mechanical centrifugal force. As a result, there may be solids in the solid form on the inner surface of the solid-liquid separation unit 400 , and the solid-liquid separation unit 400 may additionally distinguish the solids through a 200 mesh screen. At this time, in the case of more than 200 Mesh among the solids, it can be seen as a hygroscopic cellulose component from which the organic component has been removed, and when it is less than 200 Mesh, it can be considered that the hydrated cellulose component and the organic component are mixed.

Here, the hygroscopic cellulose component and organic component of less than 200 Mesh may be used as raw materials for composting through the composting unit 700 performing a general composting process.

On the other hand, in the case of the moist cellulose component, it may be dried and then molded into a pellet form to be converted into a solid fuel, or may be recycled into pulp through pressurized pulping, which will be described in detail.

<Description of the production of pellets of the moistened cellulose component>

First, with reference to FIG. 2, a method of pellet-forming the hygroscopic cellulose component into a solid fuel will be described.

The mixing molding unit 600 pellets the hygroscopic cellulose component.

Preferably, the moistened cellulose component supplied to the mixing molding unit 600 may be dried to less than about 20% moisture through the second drying unit 500 . There is no particular limitation on the drying method, and drying in a drying furnace at about 100 ° C. to 120 ° C. for about 1 to 2 hours, or drying in sunlight for about 1 to 3 days in a place with easy ventilation may be possible.

In general, there is a high possibility of mold occurrence due to organic components remaining in the moist cellulose component. In addition, the existing moist cellulose pellets had a smell and generated harmful substances due to the remaining organic components during combustion.

In addition, the calorific value of the pellets is lowered by the ash generated as the organic components are burned, but there is a problem in that the calorific value of the pellets is different because the content of the organic constituents is different for each cow, so that a constant calorific value cannot be produced. However, the moistened cellulose pellets according to the present invention can reduce the generation of odors and harmful substances by using only the moistened cellulose from which these organic components have been removed, and the effect of removing ash that adversely affects the calorific value appears.

In addition to the above advantages, the moistened cellulose pellets are expected to be able to replace wood pellets because raw materials can be easily obtained near the place of consumption compared to the existing wood pellets.

<Description on the production of pulp of the moistened cellulose component>

Next, a method of recycling the hygroscopic cellulose component into pulp through pressure pulping will be described with reference to FIG. 6 .

In general, the pulp manufacturing process consists of a pulping step to remove lignin from raw materials, and pulp bleaching and refining steps to selectively remove impurities remaining in the pulp. In the pulping step, there are atmospheric pulping methods and pressure pulping methods. The atmospheric pulping method is not preferable because the fibers contained in the moist cellulose component are not sufficiently cooked and the paper does not float well, and a considerable amount of cooking chemicals are lost in the course of the experiment. .

Accordingly, as for the pulp manufacturing process using the moist cellulose component as a raw material, a pressurized pulping method including kraft pulping, sulfite pulping, alkaline sulfite pulping, or soda pulping method is preferable. Each of the four pressure-pulping methods differs in the aqueous reactive reagent solution. The kraft pulping method uses an aqueous solution of NaOH and Na ₂ O, and the sulfite pulping method uses an aqueous solution of Na ₂ SO _{3 and} Na ₂ CO ₃ . Alkaline sulfite pulping method uses NaOH, Na ₂ SO _{3 ,} Na ₂ CO ₃ aqueous solution, and soda pulping method is a method of pulping using only NaOH.

The reaction time of the pressure cooking method is preferably about 1.5 to 4 hours, the reaction temperature is about 120 to 200 °C, and the liquid ratio (Wt/Wt) of the aqueous solution of the reactive reagent used in the cooking process to the pulp material is about 10:1 to 3 :1 is preferred. The liquid ratio between the aqueous reactive reagent solution and the pulp material is related to the strength of the paper. The higher the liquid ratio, the stronger the chemical treatment, so that most of the delicate moist cellulose components are melted, and only the coarse moist cellulose components remain, which can increase the strength of the paper.

After the pressure cooking method, if necessary, a bleaching treatment similar to the bleaching process of wood pulp can be performed.

The livestock manure recycling apparatus according to the present invention may further include a pulping unit (not shown) for performing a pulp manufacturing process by the above-described pressure cooking method.

<Example 1. Preparation of pellet solid fuel of moist cellulose component>

First, cattle meal (cow meal) was dried by the first drying unit 100 (S0). The moisture content of the dried moistened cellulose was 40% by weight.

The dried livestock powder was pulverized by the pretreatment unit 200, and impurities were removed with a screen filter (S1).

Thereafter, while stirring the livestock from which the impurities are removed by the stirring unit 300, impurities precipitated or floating are removed (S2).

The solids separated from the liquid through centrifugation of the livestock that have undergone the stirring step by the solid-liquid separation unit 400 are separated into cellulose components and organic components based on the size of 200 mesh (S3).

The separated moist cellulose component is as shown in the photo of FIG. 3 . The moisture content of the moist cellulose component having a size of 200 mesh or more was 40% by weight, but it was dried at 100° C. or higher in the second drying unit 500 for 1 hour (S4), and the moisture content was reduced to about 15% to 20% by weight. , which is as shown in the photo of FIG. 4 .

By applying a pressure of about 750 to 1000 kg/cm ³ to the dried fluorinated cellulose component, as shown in FIG. 5, it weighs about 2 g, and is molded into a cylindrical compact pellet with an area of 0.6 cm * 2.0 cm. A pellet solid fuel is prepared (S5).

The calorific value of the pellet solid fuel of the obtained cellulose component was measured. The measured calorific value was about 3220 kcal/kg of lower calorific value.

On the other hand, the separated organic components were composted by the composting unit 700 (S6).

<Example 2. Production of pulp of moist cellulose component>

First, cattle meal (cow meal) was dried by the first drying unit 100 (S10). The moisture content of the dried moistened cellulose was 40% by weight.

The dried livestock powder was pulverized by the pretreatment unit 200, and impurities were removed with a screen filter (S11).

While stirring the livestock from which the impurities are removed by the stirring unit 300, impurities that are precipitated or suspended are removed (S12).

The solids separated from the liquid through centrifugation of the livestock that have undergone the stirring step by centrifugation with the solid-liquid separation unit 400 are separated into a cellulose component and an organic component based on the size of 200 mesh (S13).

The moisture content of the moist cellulose component having a size of 200 mesh or more was 40% by weight, but it was dried at 100° C. or higher for 3 hours in the second drying unit 500 (S14), and the moisture content was reduced to about 1% to 10% by weight. .

NaOH aqueous solution was used using the caustic soda cooking method, hydrogen peroxide was used as a bleaching reagent, and sodium silicate was used as a bleaching reagent stabilizer.

10 g of the moist cellulose component was mixed with 100 g of an aqueous NaOH solution, and the swelling was performed in a constant temperature bath at 40 ° C. for 2 hours, and then cooked under the conditions shown in Table 1 below (S15).

Condition Contents NaOH Dosage (%, on dry pulp) 0.42 Liquid to Fiber ratio 10:1 Cooking Temp (degrees) 100 Heating time to Cooking Temp.(min) 20 Cooking time at Cooking Temp.(min) 100 Cooking time to Ordinary Temp (minutes) 20

In order to make the shape of the prepared sample, a thick nonwoven fabric used to prevent wrinkles on the dry surface and a roller and a two-dimensional instrument were used. The physical properties of the pulp of the prepared cellulose component were measured by TAPPI T230 om94 (Viscosity of Pulp (capillary viscometer methods)) to obtain the results shown in Table 2. Viscosity was measured in a thermostat at 25°C.

Experiment result note Viscosity (cps) Whiteness (%) fiber length mm) Differential content result 11 to 37 55 to 62 0.61 to 0.62 28-33

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications, equivalents or improved forms of the present invention are also provided by those skilled in the art using the basic concept of the present invention as defined in the following claims. It belongs to the scope of the invention.

100: first drying unit
200: preprocessor
300: stirring unit
400: solid-liquid separation unit
500: second drying unit
600: mixing molding part
700: composting unit

Claims (12)

A stirring unit for removing impurities precipitated while stirring the livestock;
a solid-liquid separation unit for separating the livestock meal supplied from the stirring unit into a dry cellulosic component and an organic component based on a predetermined solid size through centrifugation; and
Including; a pulping unit for producing pulp by pressure-pulping the moistened cellulose component;
The stirring unit performs a stirring operation and a stop operation on the mixture in which water and a surfactant are added to the livestock manure, and removes impurities precipitated during the stop operation from the mixture. According to claim 1,
Further comprising a composting unit for composting the organic component,
Livestock Recycling Device. According to claim 1,
Further comprising a first drying unit for drying the livestock and supplying it to the stirring unit,
Livestock Recycling Device. According to claim 1,
The predetermined solid size is characterized in that 200 Mesh,
Livestock Recycling Device. According to claim 1,
Further comprising a pre-processing unit for pulverizing the livestock meal, removing impurities from the pulverized livestock meal with a screen filter and supplying it to the stirring unit,
Livestock Recycling Device. According to claim 1,
The pulping unit
using a pressurized pulping method of one of kraft pulping, sulfite pulping, alkaline sulfite pulping, and soda pulping,
Livestock Recycling Device. According to claim 1,
Further comprising a bleaching unit for bleaching the prepared pulp,
Livestock Recycling Device. According to claim 1,
The mixture is characterized in that the water is more than 300 to less than 1000 parts by weight based on 100 parts by weight of the livestock powder,
Livestock Recycling Device. According to claim 1,
Further comprising a second drying unit for drying the moistened cellulose component,
The pulping unit, characterized in that the pressure-pulping of the moistened cellulose component dried from the second drying unit,
Livestock Recycling Device. 10. The method of claim 9,
The dried moistened cellulose component is characterized in that the moisture content is 10% by weight or less,
Livestock Recycling Device. A pre-treatment step of pulverizing the dried livestock and removing impurities with a screen filter;
A stirring step of removing impurities precipitated while stirring the livestock that has undergone the pretreatment step;
a solid-liquid separation step of separating the livestock powder that has undergone the stirring step into an animal fat cellulosic component and an organic component based on a predetermined solid size through centrifugation; and
A pulping step of producing pulp by pressurizing the moistened cellulose component;
In the stirring step, a stirring operation and a stopping operation are performed on the mixture in which water and a surfactant are added to the livestock meal, and impurities precipitated during the stopping operation are removed from the mixture. According to claim 1,
Further comprising a composting step of composting the organic component,
How to recycle livestock.

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