KR101297821B1 - A system and the method for culturing micro algae using anaerobic digester - Google Patents

Abstract

PURPOSE: A microalgae culture system is provided to culture microalgae using residual sludge of a sewage and wastewater treatment plant or effluence anaerobic-treated from organic waste, thereby replacing an expensive medium. CONSTITUTION: A microalgae culture system using an anaerobic digestion tank comprises: the anaerobic digestion tank (100) with an acid fermentation tank (110) and a methanol fermentation tank (120) which decomposes drain water discharged from the acid fermentation tank by microorganism; a culture tank (500) which cultures microalgae using anaerobic digestion effluent discharged from the anaerobic digestion tank; an accumulation tank (600) which induces the accumulation of useful substances in the microalgae by changing one or more conditions among medium nutrients, light, temperature, and injection of certain ingredients; a dehumidifying/desulfurizing facility (200) which dehumidifies and desulfurizes biogas discharged from the anaerobic digestion tank; a gas holder (210) which stores the biogas discharged through the dehumidifying/desulfurizing facility; a combined heat and power generator (300) which generates electricity and heat energy from the biogas; and an upgrading device (310) which methane-upgrades the biogas. [Reference numerals] (100) Anaerobic digestion tank; (110) Acid fermentation tank; (120) Methanol fermentation tank; (200) Dehumidifying/desulfurizing facility; (210) Gas holder; (300) Combined heat and power generator; (310) Upgrading device; (400) Carbon dioxide dissolution tank; (500) Culture tank; (800) Useful substance accumulation tank; (AA) Sell methane gas; (BB, FF) Heat energy and electric energy; (CC) Biogas; (DD) Drain water; (EE) Carbon dioxide and electric energy; (GG) Electric energy; (HH) Collect; (II) Inflow of residual sludge and organic waste

Description

Microalgae cultivation system using anaerobic digester and microalgae culturing method using the same {A system and the method for culturing micro algae using anaerobic digester}

The present invention relates to a microalgal culture system using an anaerobic digestion tank and a microalgal culture method using the same, and more particularly, by introducing excess sludge or organic waste in a wastewater treatment plant into an anaerobic digester to decompose into microorganisms, Acquire reduced cultured water and carbon dioxide, cultivate microalgae using the obtained cultured water and carbon dioxide, and simultaneously supply heat sources and electricity for microalgae cultivation using biogas to reduce production costs and increase production. It relates to a microalgal culture system and a microalgal culture method using the same.

In Korea, reservoirs created by various dams such as multi-purpose dams are used as important water sources due to lack of water resources, but due to the rapid urbanization and industrialization, many rivers contaminated by living sewage and factory wastewater are used as water sources. More than half of domestic appeals have been eutrophized or in progress.

The general method for treating sewage and wastewater is divided into two stages: a primary treatment step for physically removing a certain amount of suspended solids contained in the wastewater, and a secondary treatment step for biologically removing organic matter from the wastewater. The wastewater treated in the secondary treatment step contains organic matter and nitrogen, and biologically activated sludge method is most commonly used to treat such wastewater.

If sewage / wastewater is treated using activated sludge method, more than 90% of BOD can be removed, but nitrogen removal rate has a low treatment rate of 16-42%, so a large amount of nitrogen still remains after treatment with activated sludge method. Will remain. As such, if nitrogen contained in sewage and wastewater is not sufficiently removed, it may cause economic damage as well as disruption of ecosystems due to the eutrophication caused by nitrogen. In addition, in the activated sludge method, a large amount of excess sludge is generated, and there is a problem in that additional facilities and costs are added to treat such excess sludge.

        Since sewage in Korea has a relatively high proportion of nitrogen sources compared to carbon sources, wastewater treatment methods using existing microorganisms have a low nitrogen removal efficiency as mentioned above. In addition, the Biological Nitrogen Removal (BNR) process proceeds through nitrification to denitrification, and the denitrification process operates stably when the influent C / N ratio is in the range of 3.0 to 6.0. When treating domestic sewage, it can be seen that an additional carbon source is needed.

        To solve this problem, until now, a separate external organic carbon source such as ethanol or glucose has been artificially increased to remove nitrogen by increasing the C / N ratio, or a chemical treatment method has been used. Additional costs are incurred, and especially chemical treatments account for 50-90% of the total process cost, indicating the need for improvement.

In recent years, as the regulation of total phosphorus in the discharge water quality of sewage treatment plant is tightened, more than 200 billion won is used for chemical treatment method of phosphorus per year, and the problem of chemical treatment of phosphorus such as the secondary environmental pollution problem caused by the use of chemical flocculant is raised. It must be presented urgently.

In order to solve this problem, recently, a technique using a microalgae has been newly attracting attention. Microalgae play an important role in the removal of BOD by supplying oxygen (O ₂ ) to aerobic heterotrophic microorganisms and at the same time ingesting carbon dioxide (CO ₂ ) generated by respiration, and can be effectively used to remove heavy metals. It is also sensitive to hazardous compounds that are generally toxic / hardly degradable substrates but can be used for biodegradation of harmful organic pollutants.

In a typical aerobic wastewater treatment, mechanical aeration accounts for 50% of the total energy consumption, while strong mechanical aeration is likely to release pollutants or aerosols, but algae are safe from this risk and photosynthetic aeration Photosynthetic aeration reduces energy costs and can be used for economical disposal of pollutants.

Microalgae, like plants, require bound nitrogen to synthesize amino acids, nucleic acids, chlorophyll and other nitrogenous organic compounds. Algae generally absorb ammonium or nitrate ions directly from the surrounding water, but some algae dissolve dissolved compounds with extracellular enzymes to obtain ammonium. Some algae absorb organic nitrogen in the form of amino acids, small molecule amides and urea. In these organisms, these organic compounds are broken down in cells to obtain the required ammonium.

Ammonium is more readily available than nitrates in the synthesis of nitrogenous compounds in cells. However, aquatic nitrifying bacteria easily convert ammonium to nitrate, which sometimes limits the amount of ammonium available. Algae generally use nitrate reductase to convert nitrate to ammonium. Ammonium is absorbed by the membrane transport system and then directly converted to reduced organic nitrogen (RON) by enzymatic action and used for protein and chlorophyll synthesis. Nitrate use, on the other hand, requires an additional step called nitrate reductase.

Microorganisms in most wastewaters require ammonia nitrogen as a nitrogen source, while microalgae have the ability to use nitrates or nitrogen in addition to ammonia nitrogen, making it possible to use various types of nitrogen sources in wastewater. Do.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art. That is, an object of the present invention, by introducing the excess sludge or organic waste in the sewage and wastewater treatment plant into an anaerobic digester to decompose into microorganisms, to obtain a culture water and carbon dioxide reduced organic matter, and to use the obtained culture water and carbon dioxide The present invention provides a microalgal culture system and a method of culturing microalgae using the same, which can reduce the production cost and increase the production by supplying heat source and electricity necessary for culturing the microalgae using biogas. .

As a technical idea for achieving the above object, the present invention includes an acid fermentation tank for decomposing excess sludge or organic waste by acid-producing microorganisms and a methane fermentation tank for decomposing wastewater discharged from the acid fermentation tank by methane acid microorganisms. Anaerobic digester composed; A culture tank for culturing the microalgae using anaerobic digestion discharged from the anaerobic digester as culture water; It is provided with at least two, and at least one or more of the change in the composition of the medium composition, light and temperature change, injection of a specific component is different from the culture tank to induce the accumulation of useful substances in the microalgae cultured through the culture tank Useful material storage tank; Dehumidification / desulfurization equipment for dehumidifying / desulfurizing the biogas discharged from the anaerobic digester; A gas holder for storing biogas discharged through the dehumidification / desulfurization facility; A cogeneration generator for generating electricity and heat energy with biogas stored in the gas holder; And it provides a microalgae culture system using an anaerobic digestion tank comprising a nitriding device for nitrifying the biogas stored in the gas holder.

In addition, the present invention comprises the steps of reacting with microorganisms by introducing excess sludge or organic waste into the anaerobic digester; Dehumidifying / desulfurizing biogas generated by the microbial reaction; Generating electricity and heat energy by burning the dehumidified / desulfurized biogas through a cogeneration generator; Dissolving carbon dioxide in effluent with reduced organic matter by microbial reaction; Culturing the microalgae using the discharged water in which the carbon dioxide is dissolved as culture water; Transferring the cultured microalgae to a useful material storage tank to accumulate useful materials in the microalgae; And harvesting microalgae, wherein in the step of accumulating useful substances in the microalgae, the step of culturing the microalgae is a change in medium nutrient composition, light and temperature change, and injection of specific components. It provides a method for culturing microalgae using an anaerobic digester characterized in that at least one different composition to induce the accumulation of useful substances in the microalgae.

Microalgae culture system and a culture method using the same according to the present invention, by culturing the microalgae using anaerobic digestion of excess sludge or organic waste in the wastewater treatment plant through an anaerobic digester, to replace the expensive medium In addition, by obtaining the biogas generated through the anaerobic digester, it is possible to reduce the production cost of microalgae culture by supplying heat source, electricity, and carbon dioxide necessary for microalgae culture.

In addition, by harvesting the cultured microalgae, bioenergy such as biodiesel or ethanol can be produced, and at the same time, it can reduce the pollution load in the countercurrent generated during the treatment of surplus sludge, thereby reducing the operational load due to the reduction of the inflow load of the wastewater treatment plant. Not only can it improve, but there is no need for a separate biological treatment process after organic waste treatment, and the wastewater discharged after anaerobic treatment does not have to be transferred to the existing sewage and wastewater treatment plant, which reduces maintenance costs and stable discharge of wastewater treatment plant. Water quality can be maintained.

1 is a schematic diagram of a microalgal culture system according to an embodiment of the present invention.
Figure 2 is a flow chart showing a microalgae culture method according to an embodiment of the present invention.

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

In general, in order to culture microalgae, an expensive medium rich in nutrients is required. However, the cultivation method using such an expensive medium is suitable for producing high value-added substances or drinking substances such as chlorella, but when applied to produce raw materials such as bioenergy, the production cost is greatly increased, and thus, existing petroleum products are used. Compared with low competitiveness, commercialization is impossible.

Accordingly, the present invention cultivates the microalgae using anaerobic digestion of the effluent of the excess sludge or organic waste of the wastewater treatment plant. The excess sludge and organic waste in the sewage and wastewater treatment plant are rich in nutrients and trace elements and can supply a large amount of raw water continuously throughout the year, not only replacing expensive medium but also anaerobic digestion through anaerobic digester. The production cost of the microalgae culture can be reduced by acquiring the biogas generated accordingly and supplying heat source, electricity, and carbon dioxide necessary for the microalgae culture.

In addition, by reducing the pollution load in the return water generated during the treatment of excess sludge, it is possible to enhance the operational stability due to the reduction of the inflow load of the sewage and wastewater treatment plant, and it is unnecessary to separate biological treatment process after treating organic waste, and anaerobic Since the wastewater discharged after treatment does not need to be transferred to the existing sewage and wastewater treatment plant, it is possible to reduce maintenance costs and maintain stable discharged water quality of the sewage and wastewater treatment plant.

On the other hand, many kinds of microalgae are known as about 40,000 species, and are known to produce a variety of useful substances in a natural state as a biogroup having a wide variety of characteristics. The biggest advantage of microalgae culture is that it can grow in extreme environments such as high salt or strong alkali, which are not suitable for crop production. In addition, microalgae can obtain a large amount of biomass at a relatively low cost by using sunlight, carbon dioxide, etc. in the water, and the produced biomass contains various kinds of useful substances such as amino acids, lipids, drugs, polysaccharides, vitamins, etc. It is known to do.

In general, the growth of microalgae is achieved by photosynthesis and is the process of changing from carbon dioxide and light to carbohydrates in water. These photosynthetic reactions occur in the organs of chloroplasts of microalgae, and chlorophyll and carotenoids in the chloroplasts absorb light in the visible range of 400-700nm. The photosynthesis reaction consists of a main reaction and a side reaction. The main reaction requires a light energy. The photon energy strikes the electrons to generate NADPH and ATP necessary for carbon immobilization and metabolism by the energy of the electrons. The side reaction is a reaction in which hydrogen and carbon dioxide gas obtained by decomposing water react with glucose to produce glucose. As ATP becomes ADP, carbon dioxide is reduced in the form of glucose using energy and hydrogen of NADPH ₂ .

As such, carbon dioxide is an essential element for microalgae to grow through photosynthesis, and nitrogen and phosphorus should be ingested by photosynthesis. Accordingly, the present invention utilizes treated water containing a large amount of nitrogen and phosphorus generated after the anaerobic treatment of surplus sludge or organic waste in a sewage and wastewater treatment plant, and biogas generated by anaerobic treatment of surplus sludge or organic waste. By supplying heat source, electricity, and carbon dioxide necessary for microalgae cultivation, cultivating microalgae efficiently, harvesting it to produce bioenergy such as biodiesel or ethanol, and reducing the load of pollutants in sewage and wastewater treatment plants. It is intended to provide a system for effectively removing nitrogen and phosphorus from effluent.

1 is a schematic diagram of a microalgal culture system according to an embodiment of the present invention.

As shown in Figure 1, the microalgae culture system according to the present invention, anaerobic digestion tank 100, dehumidification / desulfurization facility 200, cogeneration generator 300, carbon dioxide dissolution tank 400, culture tank 500 and It is configured to include a useful material storage tank (600).

First, organic waste such as surplus sludge generated in sewage and wastewater treatment plants or livestock manure or food waste generated in livestock farms is introduced into the anaerobic digester 100 and reacted with microorganisms. The anaerobic digestion tank 100 is composed of an acid fermentation tank 110 filled with acid-producing microorganisms and a methane fermentation tank 120 filled with methane-producing microorganisms, so that organic surplus sludge or organic waste reacts with the acid-producing microorganisms. The excess sludge or organic wastes decomposed into sugars, alcohols and organic acids, and the like are decomposed into organic acids and the like to react with methane-producing microorganisms to produce biogas including methane (CH ₄ ) and carbon dioxide (CO ₂ ).

The biogas generated from the anaerobic digester 100 flows into the gas holder 210 through the dehumidification and desulfurization facility 200, and a part of the gas filled in the gas holder 210 flows into the cogeneration generator 300 to be electricity. And generates heat, and part of the conversion through the nitriding device 310 is converted to 95% or more nitrified methane gas is sold as natural gas of the car or transferred to a home or factory to sell.

At this time, the cogeneration generator 300 supplies heat to the anaerobic digestion tank 100 and the culture tank 500 in order to maintain a predetermined temperature of the anaerobic digestion tank 100 and the culture tank 500, anaerobic digestion tank 100, Electrical energy is supplied to the carbon dioxide dissolution tank 400, the culture tank 500 and the useful material storage tank 600. In addition, by collecting the carbon dioxide generated while the biogas is burned to generate electricity and heat to supply to the carbon dioxide dissolution tank 400, the present invention does not incur a cost for providing a separate carbon dioxide source, the global warming There is an advantage to reduce the amount of carbon dioxide is the main culprit.

On the other hand, anaerobic digestion through the anaerobic digestion tank 100 to reduce the organic matter is discharged to the carbon dioxide dissolution tank 400, the discharge water introduced into the carbon dioxide dissolution tank 400 is generated through the cogeneration generator 300 to carbon dioxide In contact with the carbon dioxide supplied into the dissolution tank 400 to dissolve the carbon dioxide, it is discharged to the culture tank 500 for culturing the microalgae. Subsequently, the microalgae cultivated through the culture tank 500 increases the content of carbohydrates or lipids in the microalgae through the useful material accumulation tank 600, and then harvests the microalgae and passes the biodiesel or the like through the pretreatment process to destroy the cell walls. Produces bioenergy such as ethanol, and the culture water is effectively removed nitrogen and phosphorus by microalgae, meeting the effluent water quality standards can be discharged to the outside without being connected to a separate sewage treatment plant.

In the anaerobic digester 100, surplus sludge or organic wastes from the sewage and wastewater treatment plant flow in. The surplus sludge or organic wastes are likely to contain coarse particulate matter, foreign substances such as stones, sand, and so on. It is preferable to be introduced through a means for filtering foreign matter contained in the waste water, such as a manufactured screen. The anaerobic digestion tank 100 according to the present invention includes an acid fermentation tank 110 for decomposing excess sludge and organic wastes in a sewage and wastewater treatment plant by acid-producing microorganisms, and discharge water discharged from the acid fermentation tank 110. It comprises a methane fermentation tank 120 to decompose by. The acid fermentation tank 110 and the methane fermentation tank 120 may be composed of independent reaction tanks, respectively, the acid fermentation tank 110 and the methane fermentation tank 120 may be composed of a single reaction tank.

The acid fermentation tank 110 is filled with acid-producing microorganisms, and the inflow water introduced into the acid fermentation tank 110 is anaerobic digested by the acid-producing microorganisms, and thus the inflow water is decomposed into sugars, alcohols and organic acids.

The methane fermentation tank 120 is a reaction tank in which the influent including the organic acid discharged from the acid fermentation tank 110 by the methane-producing microorganism is decomposed. Accordingly, the methane fermentation tank 120 is filled with a certain amount of methane-producing microorganisms, and the influent including the organic acid discharged from the acid fermentation tank 110 by the methane-producing microorganisms thus filled is subjected to anaerobic digestion.

On the other hand, the inflow water anaerobic digested by the acid-producing microorganisms of the acid fermentation tank 110 and decomposed into organic acids, etc., reacts with the methane-producing microorganisms of the methane fermentation tank 120 to include methane (CH ₄ ) and carbon dioxide (CO ₂ ). To generate a biogas, the anaerobic digestion water with reduced organic matter is discharged to the carbon dioxide dissolution tank 400 to be used as culture water for microalgae culture.

Biogas produced in the anaerobic digester 110 consists mainly of 60 to 70% of methane (CH ₄ ), 30 to 40% of carbon dioxide (CO ₂ ), a small amount of hydrogen sulfide (H ₂ S), ammonia (NH ₃ ), And the like. Therefore, since the biogas contains a large amount of methane gas about 60 to 70%, the biogas is burned using the cogeneration generator 300 to obtain electricity and heat energy.

The cogeneration generator 300 generates electricity and heat using methane gas (CH ₄ ) in biogas from which moisture and sulfur are removed through a dehumidification / desulfurization facility 200. In general, the optimum temperature of the microalgae is known as 25 ~ 35 ℃, it is known that the optimum growth temperature is different depending on the microalgae species. In Korea, the growth rate of microalgae is lowered as the water temperature is maintained at 25 ° C. or lower in other seasons except summer. Therefore, it is necessary to continuously supply thermal energy, but in this case, the maintenance cost is increased, causing a problem in that the production cost is increased. In the present invention, by using the methane gas of the biogas generated in the anaerobic digestion tank 100 to generate heat and electricity, it is possible to efficiently supply electricity and heat.

The solidification device 310 is a technology for removing carbon dioxide (CO ₂ ) contained in the biogas (CH ₄ ) generated in the anaerobic digester 100, and hydrogen sulfide (H ₂ S), ammonia (NH ₃ ), and the like. It is a device with desulfurization technology that removes corrosive substances and obtains more than 95% of high-quality methane gas (biomethane, CH ₄ ). The nitrification apparatus 310 which separates and uses only methane gas in such biogas is a well-known technique, and a detailed description thereof will be omitted, and the separation of methane and carbon dioxide using gas solubility difference is performed. In the anaerobic digester 100 using various nitriding methods, such as water scrubbing, pressure swing adsorption (PSA) method that separates by using the adsorption characteristics of gaseous substances, and membrane (membrane) method using the polarity of gas molecules. More than 95% of methane gas can be obtained from the produced biogas.

Carbon dioxide dissolution tank 400 is the anaerobic digestion tank 100 through the anaerobic digestion effluent water is reduced, the carbon dioxide generated through the cogeneration generator 300 is supplied, carbon dioxide is dissolved in the anaerobic digestion effluent. The carbon dioxide dissolving tank 400 sprays a portion of the discharge water from the top to maximize the contact surface of the discharge water and carbon dioxide, thereby collecting carbon dioxide moved into the atmosphere, thereby increasing the dissolution rate of carbon dioxide. To this end, the carbon dioxide dissolving tank 400 according to the present invention includes an inlet and an outlet of the discharged water, and includes an inlet pump and an inlet pipe, a high pressure microinjector, a carbon dioxide supply pipe, and an acid pipe.

The cultivation tank 500 is a large outdoor cultivation tank, which is equipped with a solar deep irradiating facility and an LED lamp to supply light to the inside of the cultivation tank, and is equipped with a large container-like structure to enable mass cultivation of microalgae. The structure is similar to that of a running track stadium in which the overall shape is a semicircular space integrated on both sides in the longitudinal direction of the rectangular space.

As the partition plate is installed in the center of the culture vessel 500 in the same length direction as the culture vessel 500, the inner space of the culture tank is formed with a track in the form of a track track by a partition plate installed in the center. By aberration driving, the culture water of the culture tank is formed in a structure circulating in one direction along a track-shaped channel. The partition plate inside the culture vessel is simply a structure for circulating the culture water in the culture vessel, and various components such as the carbon dioxide dissolution tank 400 may be disposed as long as the microalgal culture in the culture vessel is not affected. .

The useful material accumulation tank 600 is a space for inducing the accumulation of useful materials of the microalgae cultured through the culture tank 500, and can classify the microalgae according to the required environmental conditions and the accumulation period to perform the accumulation of useful materials. At least two useful material accumulators 600 are provided. Environmental conditions for accumulating useful materials of microalgae can be variously varied. Changes in medium nutrient composition such as inducing photosynthesis of microalgae while blocking nutrients, changes in light and temperature, and injection of specific components Various environmental factors can be adjusted to induce and accumulate useful substances required in microalgae.

Hereinafter, the microalgal culture method according to an embodiment of the present invention using the system configured as described above will be described.

Figure 2 is a flow chart showing a microalgae culture method according to an embodiment of the present invention.

As shown in FIG. 2, first, surplus sludge or organic wastes leaked from the wastewater treatment plant are introduced into an anaerobic digester to react with microorganisms (S212). The anaerobic digester consists of an acid fermentation tank filled with acid-producing microorganisms, and a methane fermentation tank filled with methane-producing microorganisms. The surplus sludge and organic wastes introduced into the acid fermentation tank react with the acid-producing microorganisms to form sugars, alcohol and Decomposed into an organic acid (S214), excess sludge or organic waste decomposed into an organic acid through an acid fermentation tank reacts with the methane-producing microorganisms to generate a biogas containing methane and carbon dioxide (S216).

The biogas generated from the anaerobic digester can collect biogas dehumidified and desulfurized through dehumidification / desulfurization facilities (S218) and store it in the gas holder (S220). Part of the collected biogas is introduced into the cogeneration generator. Generates electricity and heat (S222), and some of the corrosive substances such as carbon dioxide (CO ₂ ), hydrogen sulfide (H ₂ S), ammonia (NH ₃ ) contained in the biogas (CH ₄ ) through a high nitriding device By removing 95% of the high-quality methane gas (CH ₄ ) to be stored and transported / supplied to the vehicle charging, home, factory, etc.

At this time, the cogeneration generator generates thermal energy and electric energy by burning methane gas to maintain a predetermined temperature of the anaerobic digestion tank and the culture tank, and supplies heat to the anaerobic digestion tank and the culture tank, and anaerobic digestion tank, carbon dioxide dissolution tank, culture tank, and the like. Supply electrical energy to the material storage tank. In addition, the carbon dioxide generated while the biogas is burned to generate electricity and heat is supplied to the carbon dioxide dissolution tank (S224).

On the other hand, anaerobic digestion effluent with anaerobic digestion through the anaerobic digestion tank is reduced to carbon dioxide dissolution tank (S226), and anaerobic digestion effluent introduced into the carbon dioxide dissolution tank is contacted with carbon dioxide generated from the cogeneration generator and supplied into the carbon dioxide dissolution tank. The discharged water in which carbon dioxide is dissolved is discharged to the culture tank to culture the microalgae (S228).

Subsequently, the discharged water in which carbon dioxide is dissolved is discharged into the culture tank and used as culture water for culturing the microalgae, and the cultured microalgae are classified according to the required environmental conditions and the accumulation period and transferred to the useful material accumulation tank (S230). After increasing the carbohydrate or lipid content in the algae, and then harvested by the pre-treatment process to destroy the cell wall to produce bio-energy such as biodiesel or ethanol (S232).

In addition, as the culture water of the culture tank is effectively removed nitrogen and phosphorus by the microalgae, it can be discharged to the outside without being connected to a separate sewage treatment plant in accordance with the effluent water quality standards (S234).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various changes, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

100: anaerobic digestion tank 110: acid fermentation tank
120: methane fermentation tank 200: dehumidification / desulfurization equipment
210: gas holder 300: cogeneration generator
310: nitriding device 400: carbon dioxide dissolution tank
500: culture tank 600: useful material storage tank

Claims (20)

In a culture system for culturing microalgae using organic sludge such as surplus sludge from sewage and wastewater treatment plants or livestock manure and food waste from livestock farms,
An anaerobic digestion tank comprising an acid fermentation tank for decomposing excess sludge or organic waste by acid-producing microorganisms and a methane fermentation tank for decomposing wastewater discharged from the acid fermentation tank by methane-acid microorganisms;
A culture tank for culturing the microalgae using anaerobic digestion discharged from the anaerobic digester as culture water;
It is provided with at least two, and at least one or more of the change in the composition of the medium composition, light and temperature change, injection of a specific component is different from the culture tank to induce the accumulation of useful substances in the microalgae cultured through the culture tank Useful material storage tank;
Dehumidification / desulfurization equipment for dehumidifying / desulfurizing the biogas discharged from the anaerobic digester;
A gas holder for storing biogas discharged through the dehumidification / desulfurization facility;
A cogeneration generator for generating electricity and heat energy with biogas stored in the gas holder; And
A high nitriding device for high-methane-nitriding the biogas stored in the gas holder;
Microalgae culture system using an anaerobic digester comprising a.
The method of claim 1,
The culture tank is
Microalgae culture system using an anaerobic digester, characterized in that it comprises aberration to generate a forced flow of the culture water.
The method of claim 1,
In the culture tank,
Microalgae culture system using an anaerobic digester, characterized in that the light is supplied through the solar deep irrigation equipment and LED lamp.
delete delete delete The method of claim 1,
The cogeneration generator,
The microalgae culture system using the anaerobic digester, characterized in that for controlling the anaerobic digester and the culture tank to a predetermined temperature using the generated heat energy.
The method of claim 1,
The cogeneration generator,
Microalgae culture system using an anaerobic digester, characterized in that for supplying the power required for the microalgae culture system using the generated electrical energy.
The method of claim 1,
In the incubation tank,
Microalgae culture system using an anaerobic digester characterized in that it comprises a carbon dioxide dissolving tank configured independently from the culture tank to dissolve the carbon dioxide in the anaerobic digestion effluent flowing out of the anaerobic digester.
The method of claim 9,
The carbon dioxide dissolution tank,
A dissolution tank body whose top is sealed;
An inlet portion provided at one side of the dissolution tank body to allow discharge water to flow;
An outlet for outflow of the discharged water in which carbon dioxide is dissolved into the culture tank;
A carbon dioxide supply pipe installed under the dissolution tank body to introduce carbon dioxide into the dissolution tank body;
An acid pipe for injecting carbon dioxide supplied from the carbon dioxide supply pipe upward;
An inlet pipe for introducing a portion of the discharged water introduced through the inlet to the upper portion of the dissolution tank body; And
A high pressure micro-injection apparatus for injecting the discharged water introduced through the inlet pipe from the upper portion of the dissolution tank body;
Microalgae culture system using an anaerobic digester, characterized in that comprising a.
The method of claim 10,
The cogeneration generator,
Microalgae culture system using an anaerobic digester, characterized in that for supplying the carbon dioxide generated while burning the biogas to generate the electricity and thermal energy into the carbon dioxide dissolution tank through the carbon dioxide supply pipe.
delete delete delete In the microalgae culture method using the microalgae culture system using organic waste, such as live sludge generated from sewage and wastewater treatment plant, livestock manure or food waste generated from livestock farms,
Introducing excess sludge or organic waste into the anaerobic digester to react with the microorganisms;
Dehumidifying / desulfurizing biogas generated by the microbial reaction;
Generating electricity and heat energy by burning the dehumidified / desulfurized biogas through a cogeneration generator;
Dissolving carbon dioxide in effluent with reduced organic matter by microbial reaction;
Culturing the microalgae using the discharged water in which the carbon dioxide is dissolved as culture water;
Transferring the cultured microalgae to a useful material storage tank to accumulate useful materials in the microalgae; And
Harvesting microalgae;
, ≪ / RTI >
In the step of accumulating useful substances in the microalgae,
The step of culturing the microalgae is different from the composition of the composition of the medium, light and temperature changes, the composition of at least one or more of the injection of a specific component to induce the accumulation of useful substances in the microalgae using an anaerobic digester characterized in that Microalgae culture method.
16. The method of claim 15,
Reacting with the microorganisms by introducing the excess sludge or organic waste,
After the first reaction with the acid-producing microorganisms, the second microorganism culture method using an anaerobic digester, characterized in that the second reaction with methane-producing microorganisms.
16. The method of claim 15,
Dissolving carbon dioxide in the discharge water,
Microalgae culture method using an anaerobic digester, characterized in that using the carbon dioxide generated when burning the biogas through the cogeneration generator.
16. The method of claim 15,
In the step of generating the electrical and thermal energy,
A method of culturing microalgae using an anaerobic digester, characterized in that the microalgae are adjusted to a preset temperature for culturing the microalgae using the generated electric and thermal energy, and supply the necessary power.
delete delete

Images