KR102376385B1 - The processing method for the reuse of wastewater through a complex process - Google Patents

Abstract

The treatment method for using food waste water as reused water through a complex process according to the present invention includes an input process of temporarily storing the collected food waste by inputting it into an input hopper, and shredding the food waste stored in the input hopper in a shredding separator. A crushing and sorting process to select impurities, a dehydration process to dehydrate the shredded and sorted food waste in a dehydrator to separate it into solids and food waste water, and a solid-liquid separation process to separate solids from the separated food waste water in a solid-liquid separator. , a heat exchange process of heating the food waste water from which the solids have been removed in a heat exchanger, an oil-water separation process of separating the heated food waste water into solids, oil, and food waste water using specific gravity difference in an oil-water separator, and the oil A food wastewater heating process in which the removed food wastewater is heated to 70-90°C in a food wastewater heater, a mixing and chemical reaction process in which dried substances and auxiliaries are added to the heated food wastewater in a mixing and chemical reaction tank, and the dehydration process. , a drying process in which the solids separated through the solid-liquid separation process and the oil-water separation process and stored in the storage hopper, and the mixture treated through the mixing and chemical reaction process are put into a disk dryer and dried, and the condensate generated during the drying is cooled, It is characterized by including condensate treatment processes including biological treatment, membrane separation, and RO advanced treatment.
According to the present invention, in order to utilize food waste water, which is difficult to treat among food waste, as reuse water, the solids of food waste and high concentration food waste water are separated according to their respective properties, heat exchange, oil-water separation and food waste water heating process, and dried product. By effectively processing it through mixing and chemical reactions, the remaining food waste, excluding oil, is dried and the dried material is reused or recycled as dried feed. The remaining condensate can be used as reuse water through the condensate treatment process, and additionally recovered energy. There is an economic advantage to using it in a circular manner.

Description

{The processing method for the reuse of wastewater through a complex process}

The present invention relates to a treatment method for using food waste water as reuse water through a complex process, and more specifically, to use food waste water, which is difficult to treat among food waste, as reuse water by separating solids, removing oil, and heating food waste water. and a treatment method for using high-concentration food wastewater as reuse water through a complex process, which involves using high-concentration food wastewater as reuse water through processes such as protein coagulation, dried material mixing, chemical reaction, drying, and condensate treatment. .

The improvement in living standards and the development of food culture continue to increase the amount of household waste. In particular, food waste discarded from each home and restaurant has reached more than 50% of the total household waste generation, and food waste is When waste is placed in a landfill, it not only generates a foul odor due to decay, but also pollutes the surrounding area by generating leachate due to inherent moisture (moisture content of approximately 85%). The decay also provides a habitat for various pests, causing various pathogens. It is becoming a hotbed, and the resulting disease outbreak is becoming a serious social problem.

Accordingly, although many methods of reprocessing food waste so that it can be used as livestock feed or fertilizer have been recently developed and spread to the actual field, the current processing method is a process of crushing-dehydration-dehydration and is only a universal treatment method. At this time, more than 60% of the food wastewater generated in the treatment process is generated compared to the treatment volume, and not only is the pollution concentration high, but the cost of wastewater treatment exceeds 100,000 won/ton, and even this is difficult to treat, becoming a social problem. there is.

Current treatment methods for food wastewater include purifying and treating the water through a biological treatment process or physical and chemical treatment process at a sewage treatment plant, treatment through an anaerobic digestion process at a bio-treatment facility, or heat treatment of food wastewater at a reduced-pressure evaporation facility. There are methods for processing by adding evaporation into the air, but these methods have the problem that the processing cost is expensive and the processing period takes at least 30 days. In particular, the processing method using a reduced pressure evaporation facility is not economical in terms of time and energy. falls significantly.

Therefore, the energy generated in the food waste treatment process can be reduced, solids and high-concentration food wastewater can be separated according to their respective properties, and both solids and food wastewater can be recycled and treated in one facility through a complex process. Development of a method is required.

KR 10-1841098 B1(2018. 03. 16.) KR 10-1761074 B1(2017. 07. 18.)

The present invention was created to solve the problems of the prior art, and the problem to be solved by the present invention is to separate the solids of food waste and high-concentration food wastewater according to their respective properties, and to perform heat exchange, oil-water separation, and Food waste water is reused through a complex process by effectively treating waste water through a heating process, drying the remaining food waste excluding oil, reusing the dried material or recycling it as dried feed, and using the remaining condensate as reuse water through the condensate water treatment process. The purpose is to provide a treatment method for use as a waterway.

Another purpose is to provide a food waste treatment method that can reduce the energy generated in the food waste treatment process and use additionally recovered energy in a circular manner.

The treatment method for utilizing food waste water as reuse water through a complex process according to the present invention to achieve the above object includes an input process of temporarily storing the collected food waste by inputting it into an input hopper, and the input hopper stored in the input hopper. A crushing and sorting process in which food waste is shredded in a shredder and sorter to select impurities, a dehydration process in which the shredded and sorted food waste is dehydrated in a dehydrator and separated into solids and food waste water, and a solid-liquid separator among the separated food waste water. A solid-liquid separation process to separate solids, a heat exchange process to heat the food wastewater from which the solids have been removed in a heat exchanger, and to separate the heated food wastewater into solids, oil, and food wastewater using specific gravity difference in an oil-water separator. An oil-water separation process, a food waste water heating process in which the food waste water from which the oil has been removed is heated to 70-90° C. in a food waste water heater, and a mixing and chemical reaction tank in which dried materials and auxiliaries are added to the heated food waste water. A drying process in which the solids separated through the chemical reaction process, the dehydration process, the solid-liquid separation process, and the oil-water separation process and stored in the storage hopper, and the mixture treated through the mixing and chemical reaction process are placed in a disk dryer and dried. It is characterized by comprising a condensate treatment process of cooling, biological treatment, membrane separation, and RO advanced treatment of the condensate generated during drying.

In addition, the heat exchange process is characterized in that the food waste water from which the solids have been removed is heated in a heat exchanger at 50 to 70 ° C, thereby raising the temperature of the food waste water to 50 to 60 ° C.

In addition, the mixing and chemical reaction process is characterized by adding 50 to 100 parts by weight of dried material to 100 parts by weight of the heated food waste water, and using dried material with a moisture content of 5 to 10% dried through a drying process as the dried material. Do this.

In addition, the mixing and chemical reaction process is characterized in that 0.01 to 0.05 parts by weight of an auxiliary is added to 100 parts by weight of the heated food waste water, and the auxiliary agent is an alkali metal compound or an alkaline earth metal compound.

In addition, the drying process is performed by separating the solids separated through the dehydration process, solid-liquid separation process, and oil-water separation process and stored in the storage hopper, and the mixture processed through the mixing and chemical reaction process at a weight ratio of 1:1 to 1.5. It is placed in a disk dryer and dried for 2 to 3 hours while maintaining the steam temperature of the disk dryer at 135 to 145°C and the internal temperature at 100 to 120°C.

According to the present invention, in order to utilize food waste water, which is difficult to treat among food waste, as reuse water, the solids of food waste and high-concentration food waste water are separated according to their respective properties, heat exchange, oil-water separation and food waste water heating process, and dried product. By effectively processing it through mixing and chemical reactions, the remaining food waste, excluding oil, is dried and the dried material is reused or recycled as dried feed. The remaining condensate can be used as reuse water through the condensate treatment process, and additionally recovered energy. There is an economic advantage to using it in a circular manner.

In particular, it is possible to efficiently separate oil from food waste water, heat it to the optimal temperature considering the properties of the food waste water, and then go through a drying process with solids to provide dry feed with nutritional ingredients. In addition, through this, food wastewater with a BOD of 120,000 to 200,000 ppm and a total nitrogen (T-N) of 5,000 to 6,000 ppm is treated into biodegradable condensate with a BOD of 15,000 ppm and a total nitrogen (T-N) of 30 to 50 ppm. Through condensate water treatment processes such as biological treatment, membrane separation, and RO advanced treatment, it can be used as final reused water with BOD of 5ppm and total nitrogen (T-N) of 10ppm or less.

Figure 1 is a process flow diagram schematically showing a treatment method for utilizing food waste water as reused water through a complex process according to the present invention.
Figure 2 is a configuration diagram showing a treatment device for utilizing food waste water as reused water through a complex process according to an embodiment of the present invention.
Figures 3 to 7 are test reports submitted to the Korea Testing and Research Institute for condensate treated through a treatment method for utilizing food wastewater according to the present invention as reused water through a complex process.
Figure 8 is a configuration diagram showing a condensate water treatment device for utilizing food waste water as reused water through a complex process according to an embodiment of the present invention.

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

Figure 1 is a process flow diagram schematically showing a treatment method for utilizing food waste water according to the present invention as reused water through a complex process, and Figure 2 is a process flow diagram schematically showing a process for reusing food waste water according to an embodiment of the present invention through a complex process. This is a configuration diagram showing a treatment device for use as a waterway.

Referring to the attached Figures 1 and 2, the treatment method for utilizing food wastewater as reused water through a complex process according to the present invention includes an input process (S10), a crushing and screening process (S20), and a dehydration process (S30). , solid-liquid separation process (S40), heat exchange process (S50), oil-water separation process (S60), food wastewater heating process (S70), mixing and chemical reaction process (S80), drying process (S90), condensate treatment process (S100) It is made including.

1. Input process (S10)

The input process (S10) is a process of temporarily storing the collected food waste by inputting it into the input hopper (10).

The food waste is collected from homes, restaurants, and group cafeterias, has a moisture content of 80-85%, and contains a small amount of impurities such as metal, stone, glass, and vinyl.

A door (not shown) is installed at the top of the input hopper 10 so that it can be opened when food waste is input, to prevent food waste from being contaminated by external contaminants, and to prevent odorous gases generated from food waste from being released from the outside. To prevent leakage.

2. Crushing and sorting process (S20)

The shredding and sorting process (S20) is a process in which the food waste stored in the input hopper 10 is shredded in the shredding sorter 11 and impurities are sorted out.

More specifically, the food waste stored in the input hopper 10 is shredded into particles with a particle size of 50 mm or less in the shredding separator 11, and at the same time, metal, stone, and glass are crushed during the shredding process of the shredding separator 11. Contaminants with high mass, such as etc., can be sorted out separately when they are bounced by centrifugal force.

The purpose of shredding the stored food waste to a particle size of 50 mm or less is to increase the surface area to increase friction with air during the drying process below.

3. Dehydration process (S30)

The dehydration process (S30) is a process of dehydrating the shredded and selected food waste in the dehydrator 20 and separating it into solids and food waste water.

As the dehydrator 20, a centrifugal dehydration device or a press dehydration device may be used.

The solids separated through the dehydration process are transferred to the storage hopper 21 and left to wait, and the food waste water is transferred to the solid-liquid separator 30.

4. Solid-liquid separation process (S40)

The solid-liquid separation process (S40) is a process of separating solids in the solid-liquid separator (30) from the food waste water separated in the dehydration process (S30).

The solids contained in the food waste water separated in the dehydration process (S30) contain about 5 to 10% by weight of the original input amount of food waste, and the oil content contained in the food waste water is more easily recovered through the solid-liquid separation process. do.

Here, the separation efficiency of the solids can be determined by the moisture content of the food waste water, the particle size and specific gravity of the solids themselves, and the rotational force and gravity acceleration of the solid-liquid separator 30.

The solids separated through the solid-liquid separation process are transferred to the storage hopper 21 and left to wait.

5. Heat exchange process (S50)

The heat exchange process (S50) is a process of heating the food wastewater from which the solids have been separated in the heat exchanger (40).

At this time, the temperature of the heat exchanger 40 is adjusted to 50-70°C using waste heat to facilitate separation of oil. Here, the waste heat is the waste heat of the drying heat used in the disk dryer 80 in the following drying process, which has the effect of reducing externally supplied energy.

More specifically, in the drying process below, the waste heat of the drying heat used in the disk dryer (80) is heat exchanged with the wet steam (high temperature odor) generated during drying through the dry exhaust gas trap (82) installed at the rear of the disk dryer (80). , Food waste water is heated in the heat exchanger 40 through the waste heat obtained at this time. In other words, the energy required to separate and remove oil can be utilized by recovering the energy wasted during the process. At this time, the temperature of food waste water increases from 5 to 10 ℃ to 50 to 60 ℃.

The nutritional components of food wastewater consist of fat, protein, and carbohydrates with different biochemical properties. More specifically, it consists of 15-20% by weight of fat, 20-25% by weight of protein, and 55-65% by weight of carbohydrates.

In general, food wastewater is high-concentration wastewater with a biochemical oxygen demand of 120,000 to 200,000 mg/L of BOD. Since it is made up of non-degradable substances, wastewater treatment is not easy, so it is partially treated only at domestic sewage treatment plants using advanced treatment methods. It is happening. Accordingly, in the present invention, by heating and controlling the characteristics of fat, protein, and carbohydrate, which are non-degradable substances, they are converted into biodegradable substances that are easy to process and used as recycled water.

In particular, food waste is a high concentration of organic matter and contains a significant amount of oil, although its properties vary. This oil is a material that is difficult to decompose in the wastewater treatment process, and it is difficult for general wastewater treatment facilities to handle the load.

Therefore, in order to separate the oil and treat it separately, a method of separating the fat and water by raising the temperature of the food waste water to a certain extent can be used. The oil removal rate according to temperature was 10% at 10℃ or less, 50~60% at 20~30℃, 70% at 40℃, 90% at 50~60℃, and 92% at 90℃, which is efficient. The heating temperature is 50~60℃.

If oil-water separation is performed without heating, the concentration of condensate increases due to the residual fat remaining in the food wastewater, and since fat and water exist in an emulsion state, it becomes non-degradable wastewater and cannot be treated, making it difficult to reuse. Lose. In addition, layer separation between solids and food waste water occurs, preventing smooth mixing and drying, so it is essential to separate the oil.

6. Oil-water separation process (S60)

The oil-water separation process (S60) is a process of separating the heated food waste water into solids, oil, and food waste water using specific gravity difference in the oil-water separator 50.

More specifically, the heated food waste water is centrifuged at a speed of 3,000 to 5,000 rpm using the specific gravity difference in the oil-water separator 50, thereby separating it into solids, oil, and food waste water.

Here, centrifuging the heated food waste water at a speed of 3,000 to 5,000 rpm using the specific gravity difference in the oil-water separator 50 lowers the viscosity of the oil and at the same time further increases the separation efficiency through the speed of centrifugation. This is to do it.

At this time, the separated oil is animal and vegetable fat, and 4 to 5% by weight of the total food waste water is recovered and used as auxiliary fuel in power plants through heating and purification processes.

Then, the separated solids are transferred to the storage hopper 21 and left to wait.

Methods for treating food wastewater from which solids and oils have been separated through the oil-water separation process include purifying and treating the water through a biological treatment process or physico-chemical treatment process at a sewage treatment plant, or anaerobic digestion process at a bio-treatment facility. There are methods of treating food wastewater by applying heat to the food wastewater and vaporizing it into the air in a reduced pressure evaporation facility. However, these methods are not only expensive in treatment cost but also require a treatment period of at least 30 days or more. In particular, the reduced pressure evaporation facility This treatment method is significantly less economical in terms of time and energy.

Therefore, in the present invention, food wastewater from which oil has been removed through the oil-water separation process is mixed with solids to be recycled as feed. For this purpose, a process of heating to an optimal temperature must be performed in consideration of the properties of the food waste water from which the oil has been removed.

7. Food wastewater heating process (S70)

The food wastewater heating process (S70) is a process of heating the food wastewater from which the solids and oils have been separated to 70 to 90° C. in the food waste water heater (60).

By heating the food waste water from which the solids and oils have been separated to 70-90°C in the food waste water heater 60, the protein component, which is the main component of the food waste water, is coagulated and the crystallized starch (carbohydrate) is converted to amorphous. As a result, when mixed with existing solids, the electrostatic properties are improved, allowing for faster water movement and improved heat transfer rate, thereby increasing drying efficiency.

To elaborate, protein, like oil (fat), is a difficult to decompose substance and is difficult to treat in general wastewater treatment facilities. Therefore, in the present invention, in order to separate the protein component from water, the protein component is heated to the coagulation point (60-70°C) and then inputted into the drying process (S90) below, at 70-90°C in the food waste water heater (60). Proteins can be sufficiently coagulated by heating.

In addition, starch (carbohydrate), the main component of food wastewater, is a component contained in grains, plant seeds and roots, which account for most of the domestic food waste, and is a polymer carbohydrate in which a large number of glucose units are linked by glycosidic bonds. Food wastewater is also difficult to treat because of its low temperature, which prevents it from being dehydrated through starch components that are crystallized at room temperature and does not combine with other crystals. Therefore, in the present invention, crystallized starch (carbohydrates) can be converted to amorphous by heating food waste water to 70-90°C.

If the process of heating the food waste water from which the oil has been removed is not performed or is heated below the above temperature, layer separation from the existing solids occurs, causing food waste water to flow into the disk dryer 80, and the disk dryer ( 80) This is undesirable because food waste water flows into the rear end and drying does not proceed smoothly.

In addition, the non-crystallized starch component acts as a coagulant to induce the combination of solids and food waste water, resulting in smooth mixing and drying, and when dried, proteins and carbohydrates can be supplied as high-quality dry feed.

8. Mixing and chemical reaction process (S80)

The mixing and chemical reaction process (S80) is a process of adding dried materials and auxiliaries to the heated food waste water in the mixing and chemical reaction tank (70).

More specifically, for 100 parts by weight of the heated food waste water in the mixing and chemical reaction tank 70, 50 to 100 parts by weight of dried material and 0.01 to 0.05 parts by weight of auxiliary agent are added through the following drying process (S90). .

Food waste maintains a pH of about 3.0 to 4.0 through acid fermentation. Therefore, acidic food waste water does not mix well with solids, making it impossible to smoothly perform the drying process below.

In the present invention, by adding dried materials and auxiliaries to the heated food waste water, the heated food waste water acts as a coagulant and coagulates smoothly with solids, helps increase moisture diffusion, makes drying easy, and generates heat during drying. The condensed water can be discharged at a quality that allows for water treatment (BOD around 15,000 ppm).

Here, as the dried product, dried product with a moisture content of 5 to 10% dried through the following drying process (S90) can be used. Through this, the coagulation of food waste water is increased, and the viscosity section is minimized during the drying process below, allowing the drying process to be performed smoothly.

In addition, the amount of the dried material added may vary depending on the moisture content of the dried material, but for 100 parts by weight of the heated food waste water, 50 to 100 parts by weight of the dried material having a moisture content of 5 to 10% is added.

If less than 50 parts by weight of dried material is added to 100 parts by weight of the heated food waste water, coagulation of the food waste water is increased and it is difficult to minimize the viscosity section in the following drying process, resulting in agglomeration, As a result, problems may arise where drying time and workers have to stand by at all times to control it, and if more than 100 parts by weight is added, the mixing ratio of the heated food wastewater is lowered due to the addition of more dry matter than necessary, making it inefficient.

Additionally, the auxiliary agent may be an alkali metal compound or an alkaline earth metal compound.

Preferably, the alkali metal compound may be sodium carbonate (Na ₂ CO ₃ ) or sodium hydrogen carbonate (NaHCO ₃ ), and the alkaline earth metal compound may be magnesium oxide (MgO), calcium oxide (CaO), and calcium carbonate (CaCO ₃ ). You can.

In addition, the amount of the adjuvant may vary depending on the acidity of the food waste water, but preferably, 0.01 to 0.05 parts by weight of the adjuvant is added to 100 parts by weight of the heated food waste water.

Therefore, by adding an alkali metal compound or an alkaline earth metal compound to acidic food waste water, it is possible to adjust the composition to ensure good mixing with solids without having to configure a separate mixing device through dissolution, diffusion, and decomposition. It can be put into the dryer 80.

If the oil-water separation process (S60), the food waste water heating process (S70), and the mixing and chemical reaction process (S80) are not performed, the mixing of food waste water and solids does not occur smoothly, so that the food waste water is stored in the disk dryer ( 80) Not only does it not dry properly as it flows to the bottom of the bottom and gets pushed into the rear end of the disk dryer (80), but also the condensate generated during drying contains a large amount of oil and carbohydrates, making wastewater treatment difficult.

9. Drying process (S90)

The drying process (S90) is a solid material separated through the dehydration process (S30), solid-liquid separation process (S40), and oil-water separation process (S60) and stored in the storage hopper 21, and the mixing and chemical reaction process (S80). This is a process of putting the processed mixture into the disk dryer (80) and drying it.

More specifically, the solids separated through the dehydration process (S30), solid-liquid separation process (S40), and oil-water separation process (S60) and stored in the storage hopper 21 are processed through the mixing and chemical reaction process (S80). The resulting mixture is put into the disk dryer 80 at a ratio of 1:1 to 1.5 by weight, and the steam temperature of the disk dryer 80 is maintained at 135 to 145°C and the internal temperature is 100 to 120°C, and 2~ Dry for 3 hours so that the moisture content of the dried product is 5 to 10%.

At this time, since most of the condensate generated during drying is water and dust, the dust is removed through a wet dust collector (81) installed at the rear of the dryer, and only pure condensate is condensed and used as reused water through a condensate water treatment process.

The solids separated through the dehydration process (S30), the solid-liquid separation process (S40), and the oil-water separation process (S60) and stored in the storage hopper 21, and the mixture processed through the mixing and chemical reaction process (S80) are compared by weight. Mixing at a ratio of 1:1 to 1.5 not only ensures that the solids and food waste water are not separated, but also that the nutrients in the food waste water are evenly mixed with the nutrients in the solids to be used as the main source of nutrients for feed. BOD 15,000ppm This is to ensure that condensate water is discharged in a state that allows for water treatment.

In addition, the dried material can be added in a certain amount to the heated food waste water in the mixing and chemical reaction process (S80) to increase the cohesion of the food waste water and to minimize the viscosity section during the drying process to smoothly perform the drying process. .

If the internal temperature of the disk dryer 80 is lower than 100°C, the dried material may not be dried to the desired moisture content, and if it is dried at a temperature exceeding 120°C, the temperature may be higher than necessary. It is uneconomical due to drying.

Here, the disk dryer 80 is a disk dryer 80 that uses a disk plate with a large heat transfer area to quickly rotate inside the drum to agitate the contents and supply steam to dry them. When the food waste water that has not gone through the mixing and chemical reaction process (S80) is put into the disk dryer 80 having the above characteristics and dried, a film is formed on the disk plate of the disk dryer 80, thereby reducing the drying efficiency. Not only does this fall, but the layers of solids and food wastewater separate, preventing drying from proceeding smoothly.

In the present invention, dried materials and auxiliaries are added to the food wastewater through the mixing and chemical reaction process (S80), so that the heated food wastewater acts as a coagulant to smoothly coagulate with the solids and increase moisture diffusion, thereby allowing the solids and the food wastewater to coagulate smoothly. Since layer separation of wastewater does not occur and no film is formed on the disk plate of the disk dryer (80), drying proceeds smoothly, and the water quality of the condensate generated during drying can be discharged in a state that can be treated (BOD about 15,000 ppm). do.

In addition, since the properties of food waste vary greatly depending on the season, the amount of food waste water generated and the water content of food waste vary greatly when the dehydration process is performed, especially in summer and winter. However, the present invention has the advantage of being able to input food waste with a constant moisture content regardless of the season into the disk dryer 80 by performing a drying process by mixing solids and food waste water at an accurate mixing ratio.

In particular, looking at the drying structure of a disk dryer, it is largely divided into an input section - a viscosity section - a drying section, and the drying efficiency changes as the viscosity section changes depending on the moisture content. In order to control the viscosity section, a paddle and a scraper are fixed to the disk plate, so that drying efficiency can be increased only when the moisture content before drying is constant. As in the present invention, food waste with a constant moisture content is supplied to adjust the viscosity section during drying. Efficiency can be maximized by keeping it constant regardless of the season.

Here, the section with a moisture content of 40 to 60%, where food waste generally becomes more viscous and forms lumps, is called the glue zone.

After drying, the dried product is cooled in a cooling separator (90) and sorted for contaminants, metal contaminants are sorted in a magnetic separator (91), and then packaged for distribution.

The cooling separator 90 serves to cool the dried material discharged at high temperature and select foreign substances. The cooling sorter 90 is largely divided into an internal cooling plate, a rotating drum with a sorting screen attached, and a side frame for exhausting gas, and the cooling plates are arranged at regular intervals inside the drum into which the dried material enters. In addition, foreign substances such as vinyl and plastic are sorted through a screening screen installed at the rear of the drum, and the dried material is then discharged to the bottom.

Afterwards, the dried material discharged from the cooling separator (90) flows into the magnetic separator (91). Various metals contained in the dried material are sorted and removed through the magnetic separator 91, and the dried material discharged from the magnetic separator 91 is returned to the crusher 92, where it is finally pulverized, goes through a feed processing process, and is packaged and distributed.

Therefore, through the sorting and packaging process, it is possible to lower the temperature of the dried product, which has risen to a high temperature in the drying process, and at the same time select remaining impurities such as vinyl, plastic, and metal, and provide high-quality feed.

In addition, the odor and wet gas generated during the drying process of the dried material are collected and burned in an odor deodorizing furnace (not shown), and the wet vapor (steam) generated by evaporation during drying is stored in a condensate tank (not shown). It is reused as coolant during the process.

Input process (S10), crushing and screening process (S20), dehydration process (S30), solid-liquid separation process (S40), heat exchange process (S50), oil-water separation process (S60), and food waste water heating process (S70) of the present invention. Depending on the mixing and chemical reaction process (S80) and drying process (S90), it takes a total of 4 to 5 hours for food waste to be input and dried. The dried material is reused or recycled as dried feed, and the condensate is biodegradable. It will be processed to the extent possible.

Figures 3 to 7 show condensate (sample name: nutrient source extract isolated from food wastewater) treated through a treatment method for utilizing food wastewater according to the present invention as reuse water through a complex process requested by the Korea Testing and Research Institute. This is a test report.

As shown in Figures 3 to 7, the condensate (sample name: nutrient source extract isolated from food wastewater) treated through a treatment method for utilizing food wastewater according to the present invention as reused water through a complex process was tested by Korea Chemical Convergence Test. From the 56 test items analyzed by the researcher, it can be seen that the majority of the items were at a level that allowed biodegradation or were not detected.

In particular, the BOD is 15,300 ppm and the total nitrogen (T-N) is 36.6 ppm. Through the treatment method of the present invention, food waste water, which is a non-degradable material that is difficult to treat among food waste, is treated with condensate at a biodegradable level. It can be used as final reused water through condensate water treatment processes such as cooling, biological treatment, membrane separation, and RO advanced treatment.

10. Condensate treatment process (S100)

The condensate treatment process (S100) is a process of cooling, biological treatment, membrane separation, and RO advanced treatment of the condensate generated during drying.

To elaborate, the dried condensate water quality is about 15,000ppm BOD, which is at a level that is biodegradable, and can be used as final reuse water with BOD 5ppm or less through cooling, biological treatment, membrane separation, and RO advanced treatment.

Figure 8 is a configuration diagram showing a condensate water treatment device 100 for utilizing food waste water as reused water through a complex process according to an embodiment of the present invention.

Referring to the attached FIG. 8, the condensate generated during the drying is maintained at a temperature of 60° C. or higher, and is cooled through the cooling device 101 of the condensate water treatment device 100, followed by the homogenization tank 101 and ozone. Reaction tank (102), activated carbon reaction tank (103), pH adjustment tank (104), flocculation tank (105), mixing tank (106), pressure flotation tank (107), sludge storage tank (108), flow rate adjustment tank (109), biological reaction Through the process tank 110, membrane separation tank 111, activated carbon adsorption tank 112, and RO advanced treatment tank 113, the BOD is reduced to 5ppm or less, and can be recycled as final reuse water.

According to the present invention, in order to utilize food waste water, which is difficult to treat among food waste, as reuse water, the solids of food waste and high-concentration food waste water are separated according to their respective properties, heat exchange, oil-water separation and food waste water heating process, and dried product. By effectively processing it through mixing and chemical reactions, the remaining food waste, excluding oil, is dried and the dried material is reused or recycled as dried feed. The remaining condensate can be used as reuse water through the condensate treatment process, and additionally recovered energy. There is an economic advantage to using it in a circular manner.

In particular, it is possible to efficiently separate oil from food waste water, heat it to the optimal temperature considering the properties of the food waste water, and then go through a drying process with solids to provide dry feed with nutritional ingredients. In addition, through this, food wastewater with a BOD of 120,000 to 200,000 ppm and a total nitrogen (T-N) of 5,000 to 6,000 ppm is treated into biodegradable condensate with a BOD of 15,000 ppm and a total nitrogen (T-N) of 30 to 50 ppm. Through condensate water treatment processes such as biological treatment, membrane separation, and RO advanced treatment, it can be used as final reused water with BOD of 5ppm and total nitrogen (T-N) of 10ppm or less.

Above, for convenience of explanation, reference numerals and names are given to the drawings showing preferred embodiments and the configurations shown in the drawings. However, this is an embodiment according to the present invention, and the shapes shown in the drawings and the names given are The scope of the rights should not be construed as limited, and it is extremely clear that changes to various shapes that can be predicted from the description of the invention and simple substitution to a configuration that performs the same function are within the scope of changes that can be easily carried out by a person skilled in the art. You will see this as self-evident.

10: Input hopper 11: Crushing separator
20: Dehydrator 21: Storage hopper
30: solid-liquid separator 40: heat exchanger
50: Oil-water separator 60: Food waste water heater
70: mixing and chemical reaction tank 80: disk dryer
81: wet dust collector 82: dry exhaust gas trap
90: Cooling separator 91: Magnetic separator
92: Grinder 100: Condensate treatment device
101: Homogenization tank 102: Ozone reaction tank
103: activated carbon reaction tank 104: pH adjustment tank
105: flocculation tank 106: mixing tank
107: Pressurized flotation tank 108: Sludge storage tank
109: Flow adjustment tank 110: Biological reaction process tank
111: Membrane separation tank 112: Activated carbon adsorption tank
113: RO advanced treatment tank

Claims (5)

An input process (S10) of temporarily storing the collected food waste by inputting it into the input hopper (10);
A crushing and sorting process (S20) in which the food waste stored in the input hopper (10) is crushed in a crusher (11) to select contaminants;
A dehydration process (S30) of dehydrating the shredded and selected food waste in a dehydrator (20) and separating it into solids and food waste water;
A solid-liquid separation process (S40) for separating solids from the separated food wastewater in a solid-liquid separator (30);
A heat exchange process (S50) of heating the food waste water from which the solids have been removed in a heat exchanger (40);
An oil-water separation process (S60) in which the heated food waste water is separated into solids, oil, and food waste water using specific gravity difference in the oil-water separator 50;
A food waste water heating process (S70) in which the oil-free food waste water is heated to 70-90° C. in a food waste water heater (60);
A mixing and chemical reaction process (S80) in which dried materials and auxiliaries are added to the heated food waste water in the mixing and chemical reaction tank (70);
The solids separated through the dehydration process (S30), the solid-liquid separation process (S40), and the oil-water separation process (S60) and stored in the storage hopper 21, and the mixture processed through the mixing and chemical reaction process (S80) are mixed into a disk. Drying process (S90) of putting in the dryer (80) and drying; and
A condensate treatment process (S100) of cooling, biological treatment, membrane separation, and RO advanced treatment of the condensate generated during the drying;
It is accomplished including,
The mixing and chemical reaction process (S80) is,
Inject 50 to 100 parts by weight of dry matter into 100 parts by weight of the heated food waste water,
A treatment method for utilizing food waste water as reused water through a complex process, characterized in that the dried material has a moisture content of 5 to 10% dried through a drying process (S90).
According to paragraph 1,
The heat exchange process (S50) is,
The food waste water from which the solids have been removed is heated in a heat exchanger (40) at 50 to 70°C, and the food waste water is heated to 50 to 60° C. to utilize the food waste water as reused water through a complex process. Processing method for.
delete According to paragraph 1,
The mixing and chemical reaction process (S80) is,
Add 0.01 to 0.05 parts by weight of auxiliary agent to 100 parts by weight of the heated food waste water,
A treatment method for utilizing food waste water as reused water through a complex process, wherein the auxiliary agent is an alkali metal compound or an alkaline earth metal compound.
According to paragraph 1,
The drying process (S90) is,
The solids separated through the dehydration process (S30), the solid-liquid separation process (S40), and the oil-water separation process (S60) and stored in the storage hopper 21, and the mixture processed through the mixing and chemical reaction process (S80) are weighed. It is put into the disk dryer 80 at a ratio of 1:1 to 1.5, and dried for 2 to 3 hours while maintaining the steam temperature of the disk dryer 80 at 135 to 145 ℃ and the internal temperature at 100 to 120 ℃. A treatment method for using food wastewater as reuse water through a complex process.