KR101066124B1 - Dry-wet serial anaerobic digestion device and method for producing biogas from high concentrated organic waste - Google Patents

Abstract

The present invention relates to a dry-wet tandem anaerobic digestion apparatus and method for producing biogas from high concentration organic waste, and particularly, an input hopper for inputting high concentration organic waste such as sewage sludge, food waste, and livestock manure; A crusher for sorting / crushing coarse contaminants or foreign substances contained in the high concentration organic waste; A raw material storage tank for storing the high concentration organic waste sorted / crushed by the shredding separator; A solubilization tank for heating and solubilizing the sorted / crushed high concentration organic waste through heat supplied from the outside; A horizontal dry digester for anaerobic digestion of solubilized high concentration organic waste supplied from the solubilization tank to remove organic matter and produce biogas; A solid-liquid separator separating the discharge discharged from the horizontal dry digester into solid and liquid organic waste; And a wet digestion tank receiving second organic anaerobic digestion of liquid liquid discharged from the solid-liquid separator to further produce biogas from residual organic matter.
According to the present invention as described above by connecting the dry digestion tank and the wet digestion tank in series, there is no need for acid fermentation tank, moisture control tank, microbial culture tank, and by installing only one solid-liquid separator, the configuration is relatively simple and can simplify the process. As a result, installation and operating costs can be reduced.

Description

DRY-WET SERIAL ANAEROBIC DIGESTION DEVICE AND METHOD FOR PRODUCING BIOGAS FROM HIGH CONCENTRATED ORGANIC WASTE}

The present invention relates to a dry-wet in-line anaerobic digestion apparatus and method for producing biogas from high concentration organic waste, and more particularly, to a dry gas for producing biogas from a high concentration organic waste for connecting a dry digester and a wet digester in series. A wet tandem anaerobic digestion apparatus and method.

Recently, with the increase of organic waste such as food waste and sewage sludge, the necessity of proper management of organic waste is emerging.

In particular, to prevent sewage sludge, food waste, livestock manure and organic municipal solid waste from being directly buried, and to prepare for the suppression of marine discharges of these wastes in the coming years, various measures for recycling on land as well as recycling It is necessary to build a phosphorus processing system.

Accordingly, attention has been paid to an anaerobic digestion method capable of reducing the amount of sludge generated in treating the organic waste and producing biogas containing methane gas that can be used as fuel.

The anaerobic digestion treatment method is to treat organic wastes under anaerobic conditions, and has an advantage of excellent extinguishing efficiency of organic matter, and there is an advantage of recovering biogas as a by-product.

Daewoo E & C started the research and development of biogas production system using organic wastes in 1990 with the development of alternative energy. Afterwards, it started an upflow anaerobic treatment process to convert food industry wastewater generated from industrial processes into energy. It has begun to develop and has been put to practical use.

However, most of these are low solids dissolved wastewaters, which are well suited for upflow anaerobic treatment.

Since then, the development of a modern high rate anaerobic treatment method (DBS method, Korean Patent Registration No. 10-0596303) for treating sewage sludge, livestock waste, and food waste with high solid content by anaerobic processes has been in earnest. It has been successfully applied for anaerobic treatment of waste, and a full scale treatment system is operating on site.

However, livestock manure, sewage sludge, and food waste are composed of organic waste with a high solids content, so that solid-liquid separation is applied to the modern upflow anaerobic treatment process (UASB process applied to DBS process). Pretreatment facilities are needed to produce methane gas with high efficiency, such as introduction of a pretreatment system for the installation and installation of a hydrolysis tank (acid generator) for dissolution of the separated liquid.

As described above, the anaerobic digestion treatment is a suitable technique for energy recovery in organic wastewater and waste, and the treatment speed is improved according to advances in digestion treatment technology and introduction of pretreatment methods, and the recovery rate of biogas is increasing. There is a disadvantage in that biogas is not recovered from the solid-liquid separated solids.

In order to solve such a problem, Korean Patent Registration No. 10-0199315 (combining treatment system of food waste and sewage sludge) has published a system for processing anaerobic digestion of food waste and sewage sludge.

However, the system for anaerobic digestion of food waste and sewage sludge has problems that acid fermentation bacteria and organic acids are mixed with each other, making it difficult to separate solid-liquid and waste having high solid content.

In addition, organic wastes are not dissolved dissolved materials that are easily decomposed and solidified, and therefore, a long residence time of 25 days or more is usually required to be treated by anaerobic digestion.

In order to overcome the above problems, a device for recovering biogas by treating particulate biodegradable organic waste in Korea Patent Registration No. 10-0521866 (a method and apparatus for treating particulate biodegradable organic waste) has been published.

However, the method and apparatus for treating organic waste is a method of solubilizing and treating organic waste under high temperature and high pressure conditions, and the operation of the anaerobic digester consists of a wet treatment system having a high moisture content, which requires a lot of energy in the pretreatment process. There is a problem in that a separate facility for treating wastewater generated during anaerobic digestion is required.

In order to overcome the above problem, the Korean Patent No. 10-0870425 separates organic wastes containing a large amount of water into liquid wastes and solid wastes, respectively, and anaerobicly treats the anaerobic microorganisms cultured in the treatment process to each reactor. An anaerobic integrated process apparatus for treating organic wastes having a non-discharge treatment system has been published by supplying and returning to improve treatment efficiency, recovering biogas generated during treatment, and circulating waste liquid.

However, in the anaerobic integrated process apparatus for treating organic waste, a dry fire and wet process are connected in parallel, and thus the waste transport path and composition are complicated, and thus, the unit process is increased to use site, construction and operation costs, and maintenance. There is a problem that an increase in management factors.

The present invention is to solve the problems as described above, by connecting the dry digestion tank and the wet digestion tank in series, there is no need for acid fermentation tank, moisture control tank, microbial culture tank, the configuration is relatively simple by installing only one solid-liquid separator It is an object of the present invention to provide a dry-wet in-line anaerobic digestion apparatus and method for the production of biogas from high concentration organic waste, which can simplify the process.

Features of the present invention for achieving the above object,

An input hopper for inputting high concentration organic waste such as sewage sludge, food waste and livestock manure; A crusher for sorting / crushing coarse contaminants or foreign substances contained in the high concentration organic waste; A raw material storage tank for storing the high concentration organic waste sorted / crushed by the shredding separator; A solubilization tank for heating and solubilizing the sorted / crushed high concentration organic waste through heat supplied from the outside; A horizontal dry digester for anaerobic digestion of solubilized high concentration organic waste supplied from the solubilization tank to remove organic matter and produce biogas; A solid-liquid separator separating the discharge discharged from the horizontal dry digester into solid and liquid organic waste; And a wet digestion tank receiving second organic anaerobic digestion of liquid liquid discharged from the solid-liquid separator to further produce biogas from residual organic matter.

Here, the dry-wet series anaerobic digestion apparatus for producing biogas from the high concentration organic waste includes a biogas holder for storing the biogas generated in the horizontal dry digester and the wet digester; A dehumidifying desulfurizer for removing water, hydrogen sulfide and siloxane components from the biogas stored in the biogas holder; And a cogeneration generator for producing electricity and heat from the biogas discharged from the dehumidifying desulfurizer and supplying a part of the heat generated to the soluble tank.

Here, the horizontal dry digester is provided with a transverse impeller stirrer therein to stir the high concentration organic waste.

Here, the horizontal dry digester conveys a part of the discharges discharged therefrom to its front end and the soluble tank via a conveying line.

Here, the wet digester is a UASB digester.

According to another aspect of the present invention,

In the dry-wet in-line anaerobic digestion method for producing biogas from the high-concentration organic waste using the dry-wet in-line anaerobic digester, a high concentration of organic waste such as sewage sludge, food waste, and livestock manure is supplied from the input hopper. A crushing screening process for sorting and crushing foreign substances with a crushing screener; A storage step of controlling the flow rate of the high concentration organic waste by storing the high concentration organic waste discharged from the crusher in a raw material storage tank; A solubilization step of supplying high concentration organic waste discharged from the raw material storage tank to a soluble tank and heating and solubilizing the high concentration organic waste using heat supplied from the outside in the soluble tank; A biogas production process for producing biogas by anaerobic digestion of high concentration organic wastes solubilized and supplied from the solubilization tank under anaerobic conditions; A solid-liquid separation process for supplying the discharge discharged from the horizontal dry digester to a solid-liquid separator to separate the solid-liquid and liquid organic waste from the solid-liquid separator; A biogas additional production process of supplying the organic waste of the liquid discharged from the solid-liquid separator to a wet digestion tank and further producing biogas from residual organic matter by secondary anaerobic digestion under anaerobic conditions in the wet digestion tank; A gas storage step of storing the biogas discharged from the horizontal dry digester and the wet digester in a biogas holder; A dehumidification desulfurization process of removing water, hydrogen sulfide, and siloxane components from the biogas stored in the biogas holder through a dehumidification desulfurizer; And a cogeneration process for producing electricity and heat in a cogeneration generator using the biogas discharged from the dehumidifying desulfurization unit and supplying a part of the heat generated to the soluble tank.

According to the dry-wet series anaerobic digestion apparatus and method for producing biogas from the high concentration organic waste of the present invention configured as described above, there is no need for an acid fermentation tank, a moisture control tank, and a microbial culture tank by connecting a dry digester and a wet digester in series. By installing only one solid-liquid separator, the configuration is relatively simple, which simplifies the process, thereby reducing the installation and operating costs.

1 is a system configuration diagram showing the configuration of a dry-wet series anaerobic digester for producing biogas from high concentration organic waste according to the present invention.
Figure 2 is a process diagram illustrating a dry-wet serial anaerobic digestion method for producing biogas from high concentration organic waste according to the present invention.

Hereinafter, the configuration of a dry-wet series anaerobic digestion apparatus for producing biogas from high concentration organic waste according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

1 is a system configuration diagram showing the configuration of a dry-wet series anaerobic digester for producing biogas from high concentration organic waste according to the present invention.

Referring to FIG. 1, a dry-wet series anaerobic digestion apparatus 1 for producing biogas from high concentration organic waste according to the present invention includes an input hopper 10, a crusher 20, and a raw material storage tank 30. And, a soluble tank 40, a horizontal dry digester 50, a solid-liquid separator 60, a wet digester 70, a biogas holder 80, a dehumidifying desulfurizer 90, and a cogeneration generator. It consists of 100.

First, the input hopper 10 stores high concentration organic waste such as sewage sludge, food waste, and livestock manure, and inputs it to the crusher 20 to be described below.

In addition, the shredding selector 20 sorts / crushes coarse contaminants or foreign substances contained in the high concentration organic waste fed from the input hopper 10. Here, the crushing selector 20 is a ball mill (ball mill) to put a plurality of balls (steel balls) in the cylinder and crushed by the impact of the movement of the ball (steel balls), a rod crusher using a steel bar as a crushing medium mechanical devices such as rod mills, jaw crushers, impact crushers, and wheeler mills, or physical and chemical devices such as ultrasonic devices and thermal treatments. Here, the coarse contaminants or foreign matters selected by the shredding separator 20 are landfilled.

In addition, the raw material storage tank 30 stores the high concentration organic waste sorted / shredded in the shredding separator (30).

In addition, the solubilization tank 40 heats and solubilizes the selected / crushed high-concentration organic waste supplied from the raw material storage tank 30 through a heat (approximately 70 ° C) supplied from the cogeneration generator 90 to be described below. . Meanwhile, in the embodiment of the present invention, the medium concentration odor generated in the soluble tank 40 is sucked into a vacuum pump and supplied to a cooling tower, and the cooling tower liquefies water vapor to produce condensed water. It is desirable to effectively prevent it.

On the other hand, the horizontal dry digestion tank 50 is anaerobic digestion of high-concentration organic waste with a high solubilized solids concentration (SS) supplied from the soluble tank 40 to remove organic matter and produce biogas. Here, the horizontal dry digester 50 is provided with a transverse impeller stirrer 51 inside to stir the high concentration organic waste, the residence time of the high concentration organic waste is about 30 days, inflow TS 15% or so, Digestion rate (decomposition rate) 60-80%, methane gas content of biogas is about 65%. Here, also, the horizontal dry digester 50 conveys some of the discharges discharged therefrom to its front end and soluble tank 40 via the conveying line 53.

The solid-liquid separator 60 separates the discharge discharged from the horizontal dry digester 50 into solid and liquid organic waste. Here, the solid discharged from the solid-liquid separator 60 is landfilled.

In addition, the wet digestion tank 70 receives the organic waste of the liquid discharged from the solid-liquid separator 60 to further anaerobic digestion to further produce biogas from the residual organic matter. Here, the wet digestion tank 70 is a UASB (Upflow Anaerobic Sludge Blanket) digestion tank, which is naturally agitated by the inflow upstream and the produced biogas flowing into the upper portion of the liquid organic waste to the upper side, and the wet digestion tank. (70) Methane bacteria self-cultivated inside can digest high load organic matter in a short time by high concentration granular sludge, so it is very short within 10 days residence time, digestibility rate is more than 85% and content of methane gas in biogas 75 % Is around.

In addition, the biogas holder 80 stores the biogas generated in the horizontal dry digester 50 and the wet digester 70.

Meanwhile, the dehumidifying desulfurizer 90 removes water, hydrogen sulfide, and siloxane components from the biogas stored in the biogas holder 80.

In addition, the cogeneration generator 100 operates as a raw material of the biogas discharged from the dehumidifying desulfurizer to produce electricity and heat, and supplies a part of the heat (about 70 ° C. or more) to the soluble tank 40.

Hereinafter, a dry-wet series anaerobic digestion method for producing biogas from high concentration organic waste according to the present invention according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a process diagram illustrating a dry-wet serial anaerobic digestion method for producing biogas from high concentration organic waste according to the present invention.

`` Crushing sorting process-S100 ''

First, when a high concentration of organic waste such as sewage sludge, food waste, and livestock manure collected from the collection vehicle is stored in the input hopper 10 and then supplied to the shredding separator 20, the shredding separator 20 dismantles various foreign matters. And sorting at the same time.

《Storage Process-S110》

Then, the high concentration organic waste discharged from the shredding separator 20 is stored in the raw material storage tank 30.

`` Solubilization process-S120 ''

Subsequently, when the high concentration organic waste discharged from the raw material storage tank 30 is supplied to the soluble tank 40, the soluble tank 40 uses the high concentration organic waste using heat (about 70 ° C. or less) discharged from the cogeneration generator 100. Is solubilized by heating.

Biogas Production Process-S130

Subsequently, when the high concentration organic waste solubilized and supplied from the soluble tank 40 is supplied to the horizontal dry digestion tank 50, the horizontal dry digestion tank 50 carries out the high concentration organic waste having a high solids concentration SS under anaerobic conditions. Anaerobic digestion through agitation produces biogas and discharges the produced biogas to the biogas holder 80.

Solid Liquid Separation Process-S140

Then, when the discharge discharged from the horizontal dry digester 50 is supplied to the solid-liquid separator 60, the solid-liquid separator 60 separates and discharges the solids and the organic waste of the liquid.

Biogas Additional Production Process-S150

Subsequently, when the liquid organic waste discharged from the solid-liquid separator 60 is supplied to the wet digestion tank 70, the wet digestion tank 70 is anaerobic digested under anaerobic conditions to further produce biogas from residual organic matter, and the produced biogas To the biogas holder 80.

《Gas Storage Process-S150》

Meanwhile, the biogas holder 80 stores the biogas discharged from the horizontal dry digester 50 and the wet digester 70.

《Dehumidification Desulfurization Process-S160》

Subsequently, the dehumidifying desulfurizer 90 removes and discharges water, hydrogen sulfide, and siloxane components in the biogas stored in the biogas holder 80 through the dehumidifying desulfurizer.

Cogeneration Process-S170

Subsequently, the cogeneration generator 100 operates the biogas discharged from the dehumidifying desulfurization unit 90 as a fuel to generate electricity and heat, and supplies a part of the generated heat to the soluble tank 40.

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

10: input hopper 20: shredder
30: raw material storage tank 40: soluble tank
50: horizontal dry digester 60: solid-liquid separator
70: wet digestion tank 80: biogas holder
90 dehumidification desulfurizer 100 cogeneration generator

Claims (6)

An input hopper for inputting high concentration organic waste such as sewage sludge, food waste and livestock manure;
A crusher for sorting / crushing coarse contaminants or foreign substances contained in the high concentration organic waste;
A raw material storage tank for storing the high concentration organic waste sorted / crushed by the shredding separator;
A solubilization tank for heating and solubilizing the sorted / crushed high concentration organic waste through heat supplied from the outside;
A horizontal dry digester for anaerobic digestion of solubilized high concentration organic waste supplied from the solubilization tank to remove organic matter and produce biogas;
A solid-liquid separator separating the discharge discharged from the horizontal dry digester into solid and liquid organic waste; And
Dry-wet series anaerobics for producing biogas from high concentration organic waste, characterized in that it comprises a wet digestion tank receiving the organic waste of the liquid discharged from the solid-liquid separator and further producing biogas from residual organic matter. Fire Extinguisher. The method of claim 1,
Dry-wet serial anaerobic digestion apparatus for producing biogas from the high concentration organic waste,
A biogas holder for storing the biogas generated in the horizontal dry digester and the wet digester;
A dehumidifying desulfurizer for removing water, hydrogen sulfide and siloxane components from the biogas stored in the biogas holder; And
Drying for producing biogas from high-concentration organic waste, characterized in that it further comprises a cogeneration generator for producing electricity and heat from the biogas discharged from the dehumidifying desulfurizer and supplying a portion of the heat produced to the soluble tank. Wet serial anaerobic digester. The method of claim 1,
The horizontal dry digester,
Dry-wet series anaerobic digestion apparatus for producing biogas from high concentration organic waste, characterized in that a horizontal axial impeller stirrer is provided to stir the high concentration organic waste. The method of claim 3, wherein
The horizontal dry digester,
Dry-wet in-line anaerobic digestion apparatus for producing biogas from high concentration organic waste, characterized in that for conveying some of the discharge discharged from it to the front end and the solubilization tank through the transfer line. The method of claim 1,
The wet digester is
Dry-wet serial anaerobic digester for producing biogas from high concentration organic waste, characterized in that the UASB type digester. In the dry-wet series anaerobic digestion method for producing biogas from high concentration organic waste using the dry-wet series anaerobic digester of claim 1,
A crushing sorting process for receiving high-concentration organic wastes such as sewage sludge, food waste, and livestock waste from the input hopper;
A storage step of controlling the flow rate of the high concentration organic waste by storing the high concentration organic waste discharged from the crusher in a raw material storage tank;
A solubilization step of supplying high concentration organic waste discharged from the raw material storage tank to a soluble tank and heating and solubilizing the high concentration organic waste using heat supplied from the outside in the soluble tank;
A biogas production process for producing biogas by anaerobic digestion of liquid high concentration organic wastes solubilized and supplied from the solubilization tank under anaerobic conditions;
A solid-liquid separation process for supplying the discharge discharged from the horizontal dry digester to a solid-liquid separator to separate the solid-liquid and liquid organic waste from the solid-liquid separator;
A biogas additional production process of supplying the organic waste of the liquid discharged from the solid-liquid separator to a wet digestion tank and further producing biogas from residual organic matter by secondary anaerobic digestion under anaerobic conditions in the wet digestion tank;
A gas storage step of storing the biogas discharged from the horizontal dry digester and the wet digester in a biogas holder;
A dehumidification desulfurization process of removing water, hydrogen sulfide, and siloxane components from the biogas stored in the biogas holder through a dehumidification desulfurizer; And
Biogas production from the high concentration organic waste, characterized in that the cogeneration generator for producing electricity and heat from the cogeneration generator using the biogas discharged from the dehumidifying desulfurization unit and supplying a part of the heat generated to the soluble tank. Dry-Wet Serial Anaerobic Digestion Method.

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