KR20180089048A - Method for recycling and combined treatment of waste resources of city - Google Patents

Abstract

A method for combined treatment and reclamation of urban waste resources is disclosed. According to one embodiment of the present invention, in order to solve a problem of facility costs, distribution costs, energy loss, and inefficiency of operation, which are generated on a large scale in cities and remote places, a method for combined treatment and reclamation of urban waste resources which can reproduce the urban wastes into various resources by combined treatment can be provided.

Description

[0001] METHOD FOR RECYCLING AND COMBINED TREATMENT OF WASTE RESOURCES OF CITY [0002]

The present invention relates to a combined treatment and reclamation method of urban-based waste resources.

Conventional environmental and energy related facilities have been constructed as large-scale plants at distant sites far from the demand side, resulting in increased energy loss and operational inefficiency.

Recently, there is a need to construct environmentally friendly urban infrastructures in the field of resource and energy supply / treatment as well as the global environment crisis, but the use of renewable resources and energy is almost impossible with conventional large-scale plants.

As a result, there is a need for a small-scale, distributed facility adjacent to the city that minimizes the loss of resources and energy while enhancing the availability of renewable energy. As a result, there is a need for various energy supply facilities such as electricity, gas and heat, Efforts are being made to construct a circulating energy and material circulation system by integrating and operating lifeline infrastructure supporting urban areas such as waste water and sewage treatment facilities.

However, there is only a part of the connection between incineration facilities and district heating facilities to utilize incandescent heat and power generation facilities to utilize the power generation array. Instead of organic integration of various facilities, It is only a level of connecting the.

Therefore, efficient construction and networking of various urban resource supply networks including heat, gas, electricity, water, waste, carbon dioxide, renewable energy, etc. can minimize the energy consumption in the city and can equalize the load of energy and material. The city needs to build a recycling-based city-based complex plant that is an innovative complex resource / energy supply system.

Korean Patent Publication No. 10-2011-0002006 (published on Jan. 2011, 2011)

The embodiment of the present invention is a system for processing various waste resources generated in a city in order to solve problems of facility cost, distribution cost, energy loss and inefficiency of operation, And to provide a method for the combined treatment and recycling of urban-based waste resources.

According to an embodiment of the present invention, there is provided a method for producing a solid fuel, which comprises the steps of: receiving at least one of municipal waste, food waste, and sewage sludge discharged from a city; separating / A solid-liquid separation step of separating the material discharged from the hydrothermal carbonization step into a solid product and a liquid product; a step of reducing the water content of the solid product; Drying the solid product; drying the solid fuel through the solid fuel production step; and storing the solid product through the solid product drying step in a solid water storage tank. The solid fuel storage step stores the solid fuel and the solid At least one of the products Wherein the liquid product separated in the solid-liquid separation step is introduced into a nitrogen recovery reactor to recover nitrogen, thereby producing ammonia water Recovering step A method for the combined treatment and recycling of city-based waste resources may be provided, comprising the step of injecting the liquid product that has undergone the nitrogen recovery step into a anaerobic digestion tank to produce biogas and discharging the anaerobic digestion liquid in the anaerobic digestion tank have.

The solid fuel manufacturing step may include a solid fuel forming step of uniformly forming the solid fuel to a uniform size.

Also, in the hydrothermal reaction step, the food wastes and the sewage sludge may be heated to 150 to 250 ° C by hot water in a closed system.

The drying of the solid product may also reduce the water content of the solid product to below 10% by drying.

In an embodiment of the present invention, the ammonia water generated in the nitrogen recovery step may be supplied to the composite fuel cogeneration system to reduce nitrogen oxides discharged by the combustion of the composite fuel cogeneration system.

In one embodiment of the present invention, the ammonia water produced in the nitrogen recovery step is introduced into a nitrogen production reactor, and the biogas recovered in the anaerobic digestion tank is also introduced into the nitrogen production reactor, And reacting the carbon dioxide of the biogas to produce a nitrogen compound.

In addition, an embodiment of the present invention can use a material discharged from the composite fuel cogeneration system as a soil improvement agent.

In addition, the anaerobic digestion liquid discharged from the anaerobic digestion tank may be used as a liquid fertilizer.

Also, at least one of the solid fuel drying step, the hydrothermal carbonization step, and the solid product drying step may utilize heat energy or waste heat generated in the composite fuel cogeneration system according to an embodiment of the present invention.

In an embodiment of the present invention, the waste heat generated in the hydrothermal reaction step may be supplied to at least one of the nitrogen recovery reactor and the anaerobic digestion tank to be recycled as a heat source.

In addition, the food waste and the sewage sludge are stored in the food storage tank and the sludge storage tank, respectively, and the food waste storage tank and the sludge storage tank are connected to each other to communicate with each other, And at least one of the food storage tank and the sludge storage tank communicates with the composite fuel cogeneration system to treat the odor during combustion of the composite fuel cogeneration system.

According to an embodiment of the present invention, the separation / selection and drying of the solid fuel, the solid water storage tank, the solid product drying process, the hydrothermal carbonization process, the solid-liquid separation process, the nitrogen recovery process, May be supplied to any one of the food storage tank and the sludge storage tank.

According to the embodiment of the present invention, in order to solve the problem of facility cost, distribution cost, energy loss, and inefficiency of operation, which are generated on a large scale in each city and remote place, Based urban waste resources that can be reproduced by the user.

FIG. 1 is a block diagram schematically illustrating a combined processing and resource utilization method of an urban-based waste resource according to an embodiment of the present invention.
FIG. 2 is a view showing a method of using waste heat in FIG. 1,
Fig. 3 is a view showing a malodor processing method in Fig. 1; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description may form part of the detailed description of the invention.

However, the detailed description of known configurations or functions in describing the present invention may be omitted for clarity.

While the invention is susceptible to various modifications and its various embodiments, it is intended to illustrate the specific embodiments and the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals such as first, second, etc. may be used to describe various elements, but the elements are not limited by such terms. These terms are used only to distinguish one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

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

FIG. 1 is a block diagram schematically illustrating a method for complex treatment and reclamation of city-based waste resources according to an embodiment of the present invention. FIG. 2 is a view illustrating a waste heat utilization method in FIG. 1, And a method of treating odor.

Referring to FIG. 1, a method for collectively processing and recycling urban-based waste resources according to an embodiment of the present invention includes receiving at least any one of municipal waste discharged from a city, food waste, sewage sludge generated in sewage, Step can be performed.

Specifically, when waste resources generated in the city such as municipal waste, food waste and sewage sludge are transferred to a vehicle, the municipal waste is stored in the waste storage tank 100, the food waste is stored in the food storage tank 200, the sewage sludge is stored in the sludge storage tank 300 ), Respectively.

Also, the present embodiment can perform a solid fuel manufacturing step of separating / sorting the municipal wastes stored in the waste storage tank 100 into solid fuel, and drying the municipal wastes to solid fuel.

Since municipal wastes are mixed with those that can be made into solid fuel and those that are not, it is firstly selected to separate those that can be made into solid fuel, and after drying to remove the moisture contained therein, can do.

At this time, the solid fuel may be manufactured in a fluff state, but may be produced in the form of a solid through a solid fuel molding step in which the solid fuel is uniformly molded to a predetermined size.

Meanwhile, the present embodiment can perform the hydrothermal carbonization step of receiving the food waste and the sewage sludge, storing and hydrothermally carbonizing the waste. Here, the present embodiment shows food waste and sewage sludge as hydrocracking target wastes, but this is merely an example, so that the scope of right of the present embodiment is not necessarily limited to food waste and sewage sludge, but organic wastes having a high water content For example, livestock manure, wastewater sludge, agriculture and forestry biomass, etc.) are all applicable.

The hydrothermal carbonation reaction step is performed in the hydrothermal carbonization reactor 400 and the food waste stored in the food storage tank 200 and the sludge storage tank 300 and the sewage sludge can be quantitatively introduced into the hydrothermal carbonization reactor 400.

In the hydrothermal carbonization step, the food wastes and sewage sludge that are provided are heated in a closed system by heating in the range of 150 to 250 ° C to partially decompose the solid organic material, thereby separating the moisture adhering to the solid material into a liquid phase . Since the hydrothermal reaction is generally known, further explanation is omitted.

In addition, this embodiment can perform a solid-liquid separation step in which the discharged material is separated into a solid product and a liquid product through the hydrothermal reaction step. The solid-liquid separation step may be performed in the solid-liquid separator 500. The solid-liquid separation step separates the solid product with increased energy density and the liquid product with increased dissolved organic matter. At this stage, the water content of the solid product can be lowered to 30 to 40% or less by using a membrane filter press.

The present embodiment can also perform a solid product drying step in which the solid product is dried to further lower the water content of the solid product separated through the solid-liquid separation step.

Since the solid product separated in the solid-liquid separator 500 is produced through hydrothermal reaction, the water content may be about 40% or less. In order to lower the water content of the solid product to 10% or less, It can be dried. The energy source used to dry the solid product is described later.

The present embodiment can also perform a solid water storage step in which the solid fuel after the solid fuel production step and the solid product (moisture content of 10% or less) through the solid product drying step are stored in a separate solid water reservoir 600 have. At least one of the solid fuel and the solid product having low water content can be stored and stored in the solid water reservoir (600).

In addition, the present embodiment can supply at least one of the solid fuel and the solid product stored in the solid water storage tank 600 to the combined fuel cogeneration system 700 in which the combined fuel cogeneration system is performed, Accordingly, the composite fuel cogeneration system 700 can produce at least one of electricity and thermal energy.

Electricity and thermal energy produced by the composite fuel cogeneration system 700 can be used as energy sources necessary for urbanization and some of them can be used as energy required for various internal facilities and devices or stages described in the present embodiment, It is possible to recycle the energy.

Meanwhile, in this embodiment, the liquid product separated in the solid-liquid separation step may be introduced into the nitrogen recovery reactor 800 to recover nitrogen, thereby performing a nitrogen recovery step of generating ammonia water.

The hydrocracking liquid product obtained through the solid-liquid separation step contains nitrogen at a high concentration and acts as an inhibitor to the anaerobic digestion, which is a post-treatment process, and may cause difficulties in the final water treatment process. Accordingly, the nitrogen recovery reactor 800 It is possible to recover nitrogen from the hydrothermal carbonization liquid product to produce ammonia water.

At this time, the ammonia water may be supplied to the composite fuel cogeneration system 700 and reacted with the harmful exhaust gas discharged by the combustion of the composite fuel cogeneration system 700 to reduce nitrogen oxides.

For example, the composite fuel cogeneration system 700 needs to post-treat nitrogen oxides (NO _x ) discharged in a combustion process. At this time, by supplying the ammonia water to the combined fuel cogeneration system 700, , Selective non-catalytic reduction (SNCR)), the nitrogen oxide can be easily and inexpensively treated.

In this embodiment, the liquid product obtained through the nitrogen recovery step is introduced into the anaerobic digestion tank 900 to generate biogas containing methane (CH ₄ ) and carbon dioxide (CO ₂ ), and the anaerobic digestion liquid A step of discharging the liquid can be performed.

In addition, a part of the ammonia water generated in the nitrogen recovery step may be introduced into the nitrogen production reactor 1000. Also, the biogas produced in the anaerobic digestion tank 900 is supplied to the nitrogen production reactor 1000, and the ammonia water is reacted with the carbon dioxide contained in the biogas in the nitrogen production reactor 1000 to produce a nitrogen compound such as ammonium bicarbonate And the like.

Also, in this embodiment, the anaerobic digestion liquid discharged from the anaerobic digestion tank 900 can be used as a liquid fertilizer without being discarded, and waste water discharged from the anaerobic digestion tank 900 can be sent to a bottom / wastewater treatment plant.

For reference, the concentration of the wastewater is very low as compared with the conventional wastewater through various steps, so that the time and cost for wastewater treatment can be reduced.

As described above, since the present embodiment can utilize fluff solid fuel using municipal waste, hydrothermal solidification product using biodegradable organic waste (food waste, sewage sludge), and biogas, the hybrid fuel cogeneration system 700, The fuel used can vary. Therefore, the unconfined solid fuel with low specific gravity has the fluidized-bed-type combustion characteristic and the solid product with high specific gravity has the grate-phase combustion characteristic, so that the combustion furnace in which the fluidized common mode and the grate- .

 Also, the present embodiment can be utilized as another resource with the composite fuel cogeneration system 700 and by-products discharged or generated in the hydrothermal reaction.

Concretely, the ash generated after combustion in the composite fuel cogeneration system 700 may be collected and used as a soil improvement agent. Also, the anaerobic digestion liquid discharged from the anaerobic digestion tank 900 can be used as a liquid fertilizer.

As described above, the biogas recovered in the anaerobic digestion tank 900 can be added to the nitrogen production reactor 1000 to react with ammonia water to produce nitrogen compounds such as ammonium bicarbonate. As described above, in this embodiment, byproducts that are generated or discharged incidentally can be converted into resources, separate profits can be generated.

2, at least one of the solid fuel drying step, the hydrothermal carbonization step, and the solid product drying step may utilize heat energy or waste heat generated in the composite fuel cogeneration system 700, as shown in FIG. So that it can perform the corresponding process (step).

For example, when the solid fuel and the solid product are dried in the solid fuel drying step and the solid product drying step, the solid fuel is dried using the waste heat generated in the composite fuel cogeneration system 700 to reduce the water content of the solid fuel to about 10% Can be lowered.

The waste heat that is supplied to the hydrothermal carbonization reaction in the composite fuel cogeneration system 700 and used for the hydrothermal reaction is discharged to at least one of the nitrogen recovery reactor 800 and the anaerobic digestion tank 900 to be recycled as a heat source .

As described above, the food waste and the sewage sludge are stored in the food storage tank 200 and the sludge storage tank 300, respectively. As shown in FIG. 3, the food storage tank 200 and the sludge storage tank 300 communicate with each other The odor generated in the food storage tank 200 and the sludge storage tank 300 can be moved with respect to each other. That is, the malodor of the food storage tank 200 can be moved to the sludge storage tank 300, and the malodor of the sludge storage tank 300 can be moved to the food storage tank 200.

At least one of the food storage tank 200 and the sludge storage tank 300 communicates with the composite fuel cogeneration system 700 to convert odors generated in the food storage tank 200 and the sludge storage tank 300 into a composite fuel cogeneration system 700 to be simultaneously treated at the time of combustion of the composite fuel cogeneration system 700. Accordingly, the cost of the malodor treatment can be reduced and the process can be simplified.

In addition, odor can be generated in the separation / selection and drying process of the solid fuel, the solid water storage tank 600, the solid product drying process, the hydrothermal carbonization process, the solid-liquid separation process, the nitrogen recovery process and the anaerobic digestion tank 900 The malodor generated in such places may be supplied to any one of the food storage tank 200 and the sludge storage tank 300 and then collected and sent to the combined fuel cogeneration system 700.

While the present invention has been described in connection with what is presently considered to be preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited thereto.

100: waste storage tank 200: food storage tank
300: sludge storage tank 400: hydrothermal carbonization reactor
500: Solid-liquid separator 600: Solid water storage tank
700: Combined Fuel Cogeneration System 800: Nitrogen Recovery Reactor
900: Anaerobic digester 1000: Nitrogen production reactor

Claims (12)

Receiving at least one of municipal waste, food waste, and sewage sludge discharged from a city;
A solid fuel manufacturing step of separating / sorting the solid waste fuel from the municipal solid waste and drying it to produce solid fuel;
A hydrothermal carbonization reaction step of hydrothermally carbonizing the food wastes and the sewage sludge;
A solid-liquid separation step of separating the material discharged from the hydrothermal reaction step into a solid product and a liquid product;
Drying the solid product so as to lower the water content of the solid product;
A solid water storage step of storing the solid fuel through the solid fuel production step and the solid product through the solid product drying step in a solid water storage tank;
Producing at least one of electricity and thermal energy by using at least one of the solid fuel and the solid product stored in the solid water storage tank as a heat source of the composite fuel cogeneration system;
A nitrogen recovery step of adding the liquid product separated in the solid-liquid separation step to a nitrogen recovery reactor to recover nitrogen to produce ammonia water; And
Adding a liquid product obtained through the nitrogen recovery step to an anaerobic digestion tank to produce biogas, and discharging the anaerobic digestion liquid from the anaerobic digestion tank;
Based waste resources. ≪ Desc / Clms Page number 17 > The method according to claim 1,
Wherein the solid fuel manufacturing step includes a solid fuel molding step of uniformly molding the solid fuel to a uniform size. The method according to claim 1,
Wherein the hydrothermal reaction is performed by heating the food waste and the sewage sludge in a closed system to a temperature in the range of 150 to 250 ° C. The method according to claim 1,
Wherein the solid product drying step reduces the water content of the solid product to less than 10% through drying. The method according to claim 1,
Wherein the ammonia water generated in the nitrogen recovery step is supplied to the composite fuel cogeneration system to reduce nitrogen oxides discharged by combustion of the composite fuel cogeneration system. 6. The method according to claim 1 or 5,
The ammonia water produced in the nitrogen recovery step is introduced into a nitrogen production reactor, and the biogas recovered in the anaerobic digestion tank is also introduced into the nitrogen production reactor, and the ammonia water is reacted with the carbon dioxide of the biogas in the nitrogen production reactor ≪ / RTI > further comprising the step of producing a nitrogen compound. The method according to claim 1,
Wherein the composite fuel cogeneration system uses the material discharged from the composite fuel cogeneration system as a soil remediation agent. The method according to claim 1,
Wherein the anaerobic digestion liquid discharged from the anaerobic digestion tank is used as a liquid fertilizer. The method according to claim 1,
Wherein at least one of the solid fuel drying step, the hydrothermal carbonization step, and the solid product drying step utilizes heat energy or waste heat generated in the composite fuel cogeneration system. 10. The method of claim 9,
Wherein the waste heat generated in the hydrothermal carbonization step is supplied to at least one of the nitrogen recovery reactor and the anaerobic digestion tank and recycled as a heat source. The method according to claim 1,
Wherein the food waste and the sewage sludge are stored in a food storage tank and a sludge storage tank, respectively, and the food storage tank and the sludge storage tank are connected to each other to communicate with each other, Wherein at least one of the at least one storage tank is in communication with the composite fuel cogeneration system and processes the at least one odor during combustion of the composite fuel cogeneration system. 12. The method of claim 11,
The odor generated in the anaerobic digestion tank may be recovered from the food storage tank and the anaerobic digestion tank by the separation and selection of the solid fuel, the solid water storage tank, the solid product drying process, the hydrochemical reaction process, the solid- Wherein the sludge reservoir is supplied to one of the sludge storage tanks.

Images