KR20240084154A - Zero-Discharge Treatment and Reduction System for High-Concentration Organic Waste using Multi-Complex Microorganisms - Google Patents

Abstract

We are disclosing a zero-emission reduction system for organic waste that decomposes and processes high-concentration organic waste using complex microbial fermentation technology.
According to one aspect of the present invention, in a system for zero-emission treatment and reduction of high-concentration organic waste using fermentation technology of complex microorganisms, fermentation mixing in which organic waste is received and mixed with complex fermentation microorganisms to activate complex fermentation microorganisms A fermentation liquefaction tank that receives complex fermentation microorganisms and organic waste mixed in the fermentation mixing tank and dissolves and decomposes the organic waste by the action of the complex fermentation microorganisms, and waste in which organic matter is decomposed in the fermentation liquefaction tank. It provides a zero-discharge reduction system for organic waste, which includes a fermentation synthesis tank that receives supply and separates solid-liquid.

Description

Zero-Discharge Treatment and Reduction System for High-Concentration Organic Waste using Multi-Complex Microorganisms}

The present invention relates to an environmentally friendly organic waste treatment and reduction system capable of zero-emission treatment and reduction of high concentration organic waste using fermentation technology of complex microorganisms.

The content described in this section simply provides background information for this embodiment and does not constitute prior art.

Due to system revisions such as the ban on direct landfilling of organic waste and the ban on ocean dumping, interest in technologies that can efficiently process organic waste, such as reduction and recycling of organic waste, is rapidly increasing.

In general, organic waste includes water-containing solids such as food waste and livestock waste, sewage and wastewater surplus sludge generated from sewage and wastewater treatment plants, and dehydrated cakes in which the above-mentioned wastes are primarily dehydrated.

Technologies commonly applied to reduce organic waste include coagulation with chemicals, ozone treatment, mechanical dehydration, heat treatment, drying, and incineration. These technologies increase energy consumption and operating costs to reduce organic waste. , there are problems such as secondary effects caused by the use of drugs.

On the other hand, biological organic waste reduction methods are expanding because they are more environmentally friendly than the physical, chemical, and thermal treatment methods described above. However, the method of treating organic waste through aerobic digestion also has the problem of requiring energy to maintain the temperature of the digester, and anaerobic digestion technology, a representative organic waste treatment technology, also has limitations in fundamentally blocking or minimizing the discharge of waste.

Accordingly, there is a need to develop technology to decompose and minimize organic waste without the use of additional chemicals or heat treatment processes.

Republic of Korea Patent Publication No. 10-2140241 (2020.08.03.) Republic of Korea Patent Publication No. 10-2316898 (2021.10.25.)

One embodiment of the present invention is an organic waste treatment and reduction system for reducing and processing high concentration organic waste using fermentation technology of complex microorganisms, including the addition of separate chemicals or subsequent follow-up such as mechanical dehydration, heat treatment, and drying. The purpose is to provide a zero-emission reduction system that is environmentally friendly and can effectively treat high concentrations of organic waste by improving the decomposition efficiency of organic waste by introducing complex microorganisms without treatment.

According to one aspect of the present invention, in a system for zero-emission treatment and reduction of high-concentration organic waste using fermentation technology of complex microorganisms, fermentation mixing in which organic waste is received and mixed with complex fermentation microorganisms to activate complex fermentation microorganisms A fermentation liquefaction tank that receives complex fermentation microorganisms and organic waste mixed in the fermentation mixing tank and dissolves and decomposes the organic waste by the action of the complex fermentation microorganisms, and waste in which organic matter is decomposed in the fermentation liquefaction tank. It provides a zero-emission reduction system for organic waste, which includes a fermentation synthesis tank that receives supply and separates solid and liquid.

According to one aspect of the present invention, the fermentation mixing tank receives complex fermentation microorganisms from a seed microorganism culture tank, and the seed microorganism culture tank cultivates the seed microorganisms in the system and supplies the complex fermentation microorganisms to the fermentation mixing tank at a preset ratio. In addition, the fermentation mixing tank is characterized by activating the complex fermentation microorganisms while mixing them with the incoming organic waste.

According to one aspect of the present invention, the fermentation liquefaction tank has a plurality of unit fermentation liquefaction tanks arranged in series so that organic waste is sequentially fermented and decomposed, and the most downstream fermentation liquefaction tank among the plurality of unit fermentation liquefaction tanks is an upstream fermentation tank. It is characterized by being formed 1.5 to 2 times larger than the capacity of the liquefaction tank.

According to one aspect of the present invention, the fermentation synthesis tank is characterized in that it is one of a membrane bioreactor (MBR), a flotation tank, a centrifugal separation tank, and a gravity sedimentation tank.

According to one aspect of the present invention, the sludge accumulated in the fermentation synthesis tank is returned to the fermentation mixing tank at a preset rate.

According to one aspect of the present invention, the non-discharge reduction system for organic waste further includes a return sludge fermentation tank, and the returned surplus sludge is activated in the return sludge fermentation tank and then returned to the fermentation mixing tank. .

According to one aspect of the present invention, a catalyst synthesis tank is included at the rear end of the fermentation synthesis tank, and the catalyst synthesis tank is characterized by receiving and treating treated water discharged from solid-liquid separation in the fermentation synthesis tank.

According to one aspect of the present invention, the catalyst synthesis tank is characterized in that it is formed as a fixed bed biofilm reactor.

According to one aspect of the present invention, the organic waste flowing into the fermentation mixing tank is any selected from the group consisting of surplus sludge generated from a sewage and wastewater treatment device, pre-treated food waste, food waste water, and livestock manure, or mixtures thereof. It is characterized by being one.

According to one aspect of the present invention, the fermentation mixing tank, fermentation liquefaction tank, and fermentation synthesis tank are maintained in an aerobic environment and are operated with repeated aeration and rest according to a preset cycle.

As described above, according to one aspect of the present invention, the decomposition efficiency of high-concentration organic waste is improved by introducing complex fermentation microorganisms and causing cell lysis by the complex fermentation microorganisms, thereby enabling zero discharge of organic waste. There is.

According to one aspect of the present invention, the effective population of microorganisms in the non-emission reduction system for organic waste can be maintained above a preset number by additionally reactivating the returned sludge in the system, and as a result, stable treatment efficiency even in the case of high concentration of organic waste. It has the advantage of being able to maintain .

In addition, according to one aspect of the present invention, no separate chemicals are input for the metabolism of complex fermentation microorganisms, and organic waste is decomposed within the system, so almost no solids are generated, so the waste It has the advantage of being able to operate an eco-friendly system because additional energy-consuming reduction processes such as dehydration or drying equipment for treatment can be omitted.

Figure 1 is a diagram illustrating a process diagram of a system for processing and reducing high-concentration organic waste according to an embodiment of the present invention.
Figure 2 is a diagram showing the organic waste reduction mechanism within the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.
Figure 3 is a graph showing changes in the inflow amount of organic waste and the waste reduction rate of the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.
Figure 4 is a graph showing the change in waste reduction capacity (Reduction Capacity) according to the residual organic waste concentration (MLSS) in the overall system in the treatment and reduction system for high-concentration organic waste according to an embodiment of the present invention.
Figure 5 is a graph showing changes in treated water quality of the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.
Figure 6 is a diagram showing the mass balance flow within the process of the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.
Figure 7 is a graph showing the change in the average organic waste transfer amount for each unit reaction tank in the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.
Figure 8 is a graph showing the reduction rate and rate of organic waste for each unit reaction tank in the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.
Figure 9 is a graph showing the reduction rate and reduction rate of organic waste for each unit reaction tank during steady state operation in the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.
Figure 10 is a photograph showing the decomposition state of organic waste in each unit reaction tank during steady state operation of the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. While describing each drawing, similar reference numerals are used for similar components.

Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component. The term and/or includes any of a plurality of related stated items or a combination of a plurality of related stated items.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when a component is referred to as being “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "include" or "have" should be understood as not precluding the existence or addition possibility of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. .

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains.

Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Additionally, each configuration, process, process, or method included in each embodiment of the present invention may be shared within the scope of not being technically contradictory to each other.

Figure 1 is a diagram illustrating a process diagram of a system for processing and reducing high-concentration organic waste according to an embodiment of the present invention.

Referring to Figure 1, the high-concentration organic waste treatment and reduction system 100 (hereinafter referred to as 'system 100') according to an embodiment of the present invention includes a fermentation mixing tank 110 and a seed microbial culture tank ( 120), a fermentation liquefaction tank 130, a fermentation synthesis tank 140, a returned sludge fermentation tank 145, a catalyst synthesis tank 150, and a treatment tank 160. The system 100 may be implemented as a single device and include the above-described components, or each of the above-described components may be implemented as a single device or process.

The fermentation mixing tank 110 receives a high concentration of organic waste flowing in from the outside and the activated sludge returned from the return sludge fermentation tank 145, and mixes the organic waste with the complex fermentation microbial material input from the seed microorganism culture tank 120. do.

The fermentation mixing tank 110 increases the activity of the microorganisms by mixing the input fermentation microorganisms and organic waste to effectively remove organic matter from the fermentation liquefaction tank 130. For this purpose, the fermentation mixing tank 110 is maintained in an aerobic environment, and aeration and rest are repeated according to a preset cycle. The fermentation microorganisms and organic waste mixed in the fermentation mixing tank 110 are discharged to the fermentation liquefaction tank 130.

Meanwhile, high-concentration organic waste flowing in from outside may be selected from the group consisting of surplus sludge generated from sewage and wastewater treatment equipment, pre-treated food waste, food waste water, livestock manure, and mixtures thereof.

Such organic waste (sludge) may be collected in a separate storage tank (not shown) before being introduced into the fermentation mixing tank 110, and separate pretreatment may be performed for effective treatment of the organic waste.

As an example, food waste sludge can be transported to the fermentation mixing tank 110 in a state that is shredded to an appropriate size through crushing or specific gravity selection, and in the case of livestock manure sludge, it is transferred to the fermentation mixing tank 110 after removing contaminants. It can be. In addition, when two or more types of organic waste are mixed and treated, individual pretreatment may be performed depending on the type of each waste and then mixed in the fermentation mixing tank 110. However, the pretreatment method for organic waste is not limited to this.

The seed microorganism culture tank 120 cultivates the seed microorganisms of the system 100 and supplies complex fermentation microbial material to the fermentation mixing tank 110 at a preset ratio.

The seed microorganism culture tank 120 receives surplus sludge generated from a sewage treatment plant as a substrate for seed microorganisms and cultivates complex fermentation microorganisms.

Seed microorganisms may be composed of microorganisms capable of performing fermentation metabolism, and complex fermentation microorganisms cultured in the seed microorganism culture tank 120 are composed of a mixture of fermentation microorganisms and synthetic microorganisms that use fermentation products.

The preset rate at which complex fermentation microbial material is introduced from the seed microorganism culture tank 120 into the fermentation mixing tank 110 is, for example, 3% (v/v) with respect to the amount of organic waste flowing into the fermentation mixing tank 110. It may be a ratio within .

The fermentation liquefaction tank 130 receives a mixture of complex fermentation microorganisms and organic waste from the fermentation mixing tank 110, decomposes the organic waste (sludge), and reduces the waste.

The fermentation liquefaction tank 130 may be composed of one or more reaction tanks, and the number of fermentation liquefaction tanks may vary depending on the type (property and concentration, etc.) of the organic waste flowing into the system 100.

When the incoming organic waste is at a high concentration, it is preferable to include at least three, more preferably four, fermentation liquefaction tanks, but the number of reaction tanks constituting the fermentation liquefaction tank is not limited to this.

As an example, the fermentation liquefaction tank 130 includes a first fermentation liquefaction tank 132, a second fermentation liquefaction tank 134, a third fermentation liquefaction tank 136, and a fourth fermentation liquefaction tank 138. The first to fourth fermentation liquefaction tanks (132, 134, 136, and 138) are arranged adjacent to each other in series. In the case of high-concentration organic waste, the fermentation and decomposition efficiency of the high-concentration organic waste can be further improved in the process of sequentially passing through four fermentation and liquefaction tanks (132, 134, 136, and 138).

When the fermentation liquefaction tank 130 is comprised of a plurality of fermentation liquefaction tanks, the fermentation liquefaction tank located downstream may be formed with a capacity 1.5 to 2.0 times larger than the fermentation liquefaction tank located upstream.

For example, in the case of a four-stage fermentation liquefaction tank (132, 134, 136, 138), the third fermentation liquefaction tank (136) and the fourth fermentation liquefaction tank (138) are the first and second fermentation liquefaction tanks (132). , 134) can be formed to be 1.5 to 2.0 times larger than the capacity. Additionally, it is possible for the fourth fermentation liquefaction tank 138 to be formed as a reaction tank with a larger capacity than the third fermentation liquefaction tank 136.

In the first to fourth fermentation liquefaction tanks (132, 134, 136, and 138), a metabolic action in which organic matter is decomposed by aerobic and anaerobic fermentation microorganisms occurs. For this purpose, each fermentation liquefaction tank (132, 134, 136, 138) is maintained in an aerobic and anaerobic environment, and higher dissolved oxygen is maintained compared to the fermentation mixing tank (110) for dismantling organic waste (sludge) and decomposing organic matter. Make it possible.

In order to maintain an aerobic and anaerobic environment, aeration and rest are repeated in each fermentation liquefaction tank (132, 134, 136, 138) according to a preset cycle (Cycle). As an example, the preset cycle of the fermentation liquefaction tank 130 may consist of 20 hours of abandonment followed by 4 hours of rest.

While sequentially passing through the first to fourth fermentation tanks (132, 134, 136, and 138), organic matter is decomposed to form sludge in a solubilized state and is discharged to the fermentation synthesis tank (140).

The system 100 of the present invention forms the fermentation liquefaction tank 130 into a plurality of reaction tanks arranged in series, and further, the downstream fermentation liquefaction tank 138 has a larger capacity than the upstream fermentation liquefaction tank. By doing so, the sludge residence time in the fermentation liquefaction tank 130 can be further extended.

At this time, the F/M ratio becomes relatively low. As a result, the fermentation liquefaction tank generates not only the metabolic action of decomposing organic matter by microorganisms, but also the decomposition action of sludge. The sludge reduction mechanism in the environment of this system 100 is shown in FIG. 2.

Figure 2 is a diagram showing a sludge reduction mechanism within an organic waste treatment and reduction system according to an embodiment of the present invention.

Referring to Figure 2, it can be seen that sludge reduction by complex fermentation microorganisms is achieved through complex actions.

The system 100 of the present invention is maintained with a long sludge retention time (SRT) and a low F/M ratio, so the reaction tanks in the system 100 where organic waste and complex microorganisms come into contact, that is, the fermentation mixing tank ( 110), the fermentation liquefaction tank 130, the fermentation synthesis tank 140, etc., an oil metabolism process in which organic matter is decomposed by microorganisms progresses.

In the process of oil and fat metabolism, complex microorganisms generate oil and fat energy by using dissolved organic and inorganic substances released by hydrolysis of nutrients contained in organic waste, that is, sludge, and lysis of microorganisms.

Reduction of organic waste (sludge) is achieved by the Lysis-Cryptic Growth process of microorganisms. In the lysis-stealth growth process, cells are destroyed and dissolved by hydrolytic enzymes, and microorganisms reuse the lysates and dissolved minerals for new cell growth, thereby reducing organic waste.

Referring again to FIG. 1, the fermentation synthesis tank 140 receives the sludge discharged from the fermentation liquefaction tank 130 and performs solid-liquid separation, and the solid-liquid separated treated water is sent to the catalyst synthesis tank 150, where the solid-liquid is separated. Some of the sludge accumulated in the reaction tank is discharged to the return sludge fermentation tank (145).

The fermentation synthesis tank 140 can be configured in various forms on the premise that it performs the function of solid-liquid separation, and may be configured in the form of a membrane bioreactor (MBR), flotation tank, centrifuge tank, gravity sedimentation tank, etc. You can.

For example, if the fermentation synthesis tank 140 is a membrane bioreactor (MBR), the membrane to be immersed may be a hollow fiber membrane. In particular, by applying a hollow fiber membrane with an effective pore size of about 0.1㎛, sludge and treated water are filtered and separated in the fermentation synthesis tank 140.

In the system 100 of the present invention, the hydraulic retention time (HRT) from the fermentation mixing tank 110 to the fermentation synthesis tank 140 is about 40 to 75 days. However, the residence time (HRT) of system 100 may change depending on the inflow rate of organic waste.

The returned sludge fermentation tank 145 receives some of the surplus sludge accumulated in the catalyst synthesis tank 140, activates microorganisms in the surplus sludge, and returns it to the fermentation mixing tank 110.

The excess sludge flowing into the returned sludge fermentation tank 145 may range from 20 to 40% (v/v) of the amount of organic waste flowing into the system.

For example, when a high concentration of organic waste is introduced, the ratio of surplus sludge returned to the fermentation mixing tank 110 through the return sludge fermentation tank 145 is preferably 30% (v/v) or more, but is not limited to this. It may vary depending on the type and nature of the waste.

Additionally, the returned sludge fermentation tank 145 may be composed of at least one fermentation tank, and when it is composed of a plurality of fermentation tanks, unit fermentation tanks may be arranged in series. The number of unit fermenters constituting the returned sludge fermentation tank 145 may also vary depending on the type and concentration of the incoming organic waste.

In the returned sludge fermentation tank 145, the surplus sludge to be returned is re-fermented to activate microorganisms in the surplus sludge and increase the effective number of microorganisms in the system.

Biological treatment of organic waste can improve treatment efficiency depending on the number of activated microorganisms, that is, effective microorganisms, in the reaction tank. In general, it is known that the activated sludge method requires an effective microbial population of 10 ⁶ to 10 ⁹ CFU/ml.

Therefore, in order to implement zero-discharge reduction treatment of organic waste (sludge), the effective population of microorganisms in the system 100 is a very important factor. In particular, for zero-discharge reduction treatment of high-concentration organic waste, at least 10 ¹³ in the system 100 An effective microbial population of more than bacteria/㎖ must be formed.

To this end, the returned sludge fermentation tank 145 performs re-fermentation by giving up excess sludge, and can receive complex fermentation microbial agents at a preset ratio from the seed microbial culture tank 120 as needed to increase activation efficiency. . When receiving complex fermentation microbial preparations, the preset ratio may be within 3% (v/v) of the organic waste inflow.

In addition, the returned sludge fermentation tank 145 maintains the inside of the fermentation tank 145 at a level of DO of 5 to 8 mg/L and pH of 7 to 8.5 for efficient re-fermentation of surplus sludge.

The surplus sludge activated in the returned sludge fermentation tank 145 is returned to the fermentation mixing tank 110 to accelerate the treatment of high-concentration organic waste flowing into the system 100.

The catalyst synthesis tank 150 receives the supernatant separated from solid and liquid in the fermentation synthesis tank 140, removes residual organic substances and particulate matter contained in the supernatant, and then discharges the final treated water into the treatment water tank 160.

In the catalyst synthesis tank 150, particulate inorganic matter (PIM) is dissolved by organic acids and fermentation products, and as a result, the treated water discharged from the catalyst synthesis tank 150 contains magnesium (Mg) and silicon ( The content of inorganic elements such as Si), potassium (K), and calcium (Ca) is higher than that of the treated water from other unit reaction tanks in the previous stage.

The catalyst synthesis tank 150 may be composed of a membrane bioreactor (MBR), a fixed-bed bioreactor (FFB), an activated carbon filter, etc.

For example, if the catalyst synthesis tank 150 is a fixed bed biofilm reactor (FFB), it may be implemented as a multi-stage reaction tank. The catalyst synthesis tank 150 is also operated in an aerobic state, and like other reaction tanks described above, it is operated in a manner in which aeration and rest are repeated according to a preset cycle.

The treatment water tank 160 receives the treated water treated in the catalyst synthesis tank 150 and temporarily stores it before discharge. The stored treated water is discharged directly or returned to a sewage treatment plant.

In addition, the final treated water discharged from the system 100 of the present invention has a high content of inorganic elements and can be reused as a raw material for soil conditioners, so it can be transported to the consumer as recycled water, if necessary.

The waste (sludge) reduction rate of the high-concentration organic waste treatment and reduction system 100 according to an embodiment of the present invention is shown in Table 1 below.

As an example, the high-concentration organic waste treatment and reduction system 100 was operated for 302 days, and sludge reduction treatment was performed by receiving surplus sludge from a sewage treatment plant. Table 1 shows the results calculated based on the inflow sludge amount (MLSS) during the entire operation period of the system 100, the total sludge amount (residual amount) accumulated in each reaction tank of the system 100, and the sludge amount of the final treated water. .

During the above operation period, the total amount of surplus sludge flowing into the system 100 of the present invention was 4,853 kg based on Mixed Liquor Suspended Solids (MLSS), the sludge discharge from the treated water during the period was 1.05 kg, and the amount of sludge accumulated in the reaction tank was 1.05 kg. was 1,128 kg. The overall net sludge reduction rate of system 100 was 76.8%, and fixed suspended solids (FSS) were also reduced by 55%.

In particular, the amount of solids contained in the treated water that is treated and finally discharged through the operation of the system 100 is only 0.01% of the total amount of incoming sludge, so the high-concentration organic waste treatment and reduction system 100 of the present invention is ultimately It can be confirmed that zero discharge of sludge is possible.

item MLSS (kg) VSS (kg) FSS (kg) Inflow (A) 4,853 4,077 776 Residual amount (B) 1,128 778 350 Reduction amount (A-B) 3,725 3,299 426 Loss rate (%) 76.8 80.9 55.0

Figures 3 and 4 show changes in sludge reduction of the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.

Referring to FIG. 3, it is a graph showing changes in the inflow amount and reduction rate of waste (sludge) during the operation period of the system according to the above embodiment.

Figure 3(a) shows changes in sludge inflow, sludge accumulation in the reaction tank, and sludge reduction rate based on MLSS, and Figure 3(b) shows changes in sludge inflow, accumulation in the reaction tank, and reduction rate based on FSS. .

Referring to Figure 3(a), it can be seen that the MLSS begins to reduce sludge from the beginning of operation, and in particular, the reduction rate can be confirmed to increase linearly after 80 days.

In the case of FSS, it can be seen that the reduction begins after 140 days, and it can be seen that the amount of FSS accumulated in the reaction tank remains relatively constant after the reduction begins.

Figure 4 is a result showing the change in residual MLSS (RMLSS) and sludge reduction capacity (Reduction Capacity) in the system during the operation period of the system 100 according to the above embodiment, and Figure 4(a) shows the change in RMLSS , Figure 4(b) shows the reduction capacity of MLSS, and Figure 4(c) shows the change in reduction capacity of FSS.

Referring to Figure 4, it can be seen that after 114 days, the MLSS reduction capacity (Figure 4(b)) begins to gradually increase, and the reduction of FSS (Figure 4(c)) also begins, and at this time, the system It can be seen that the rate of increase in the amount of accumulated RMLSS (Figure 4(a)) changes gradually. From these results, it is determined that the operation of the system 100 according to the embodiment reaches a steady state after 114 days.

Figure 5 is a graph showing the change in final treated water quality of the system 100 according to an embodiment of the present invention.

Figure 5(a) shows the BOD, COD, and SS of the final treated water, and Figure 5(b) shows the T-N and T-P concentrations of the final treated water.

During the operation period of the example, the average water quality of the inflow water to the system 100 was BOD 3,938 mg/L, COD 3,009 mg/L, SS 12,366 mg/L, T-N 547 mg/L, and T-P 356 mg/L, Figure 4 Referring to , the stable water quality of treated water after 200 days is BOD 1~2 mg/L, COD 55~75 mg/L, SS 1.0 mg/L, T-N 60~75 mg/L, and T-P 10~14 mg/L. It was confirmed.

The system 100 of the present invention achieved a removal rate of more than 98% of organic and particulate matter during the sludge reduction process, and was also able to remove more than 80% of T-N and T-P. From these results, the organic waste treatment and reduction system 100 of the present invention can achieve high water treatment efficiency in addition to a sludge reduction rate close to zero discharge.

Below, in order to analyze the sludge reduction efficiency in individual reactors during the operation period of the system 100 according to the embodiment, the sludge transfer amount and reduction rate of the unit reactor were calculated based on the mass balance flow of the system.

The system 100 according to the embodiment was formed and operated as a plurality of fermentation liquefaction tanks 130, including first to third fermentation liquefaction tanks 132, 134, and 136.

Figure 6 is a diagram showing the flow of material balance within the system of the treatment and reduction system for high-concentration organic waste according to an embodiment of the present invention, and Figures 7 to 9 are calculated based on the material balance flow chart disclosed in Figure 6. This is the result of analyzing the sludge reduction efficiency in the unit reaction tank.

Referring to Figure 6, for each reaction tank, the mass balance was calculated based on the sludge transfer amount (MLSS standard, F _i ), sludge concentration (MLSS standard, S _i ), and FSS concentration (I _i ), and each reaction tank was converted to an aerobic environment. Since it is maintained, changes in the amount of aeration (A _i ) and humidity (H _i ) in the dry air were also reflected in the calculation of the material balance.

Figure 7 is a result showing the average sludge transfer amount for each unit reaction tank according to an embodiment of the present invention. Figure 7(a) shows the change in sludge transfer amount in each unit reaction tank within the operating period, and Figure 7(b) shows the average sludge transfer amount in each unit reaction tank.

Referring to FIG. 7, it can be seen that the amount of sludge transported in the unit reaction tank decreases significantly as it moves from the second fermentation liquefaction tank 134 to the rear end, resulting in a rapid decrease in sludge while passing through the second fermentation liquefaction tank 134. It is judged to be progressing. In particular, the sludge transfer amount of the fermentation synthesis tank 140 was maintained constant after the normal state.

Figure 8 is a graph showing the sludge reduction rate and reduction rate for each unit reaction tank during the entire operation period of the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.

Figure 8(a) shows the sludge inflow calculated by mass balance flow and the sludge loss rate for each unit reaction tank, and Figure 8(b) shows the sludge loss rate for each unit reaction tank.

Referring to FIG. 8, the average sludge inflow into the system 100 during the operation period of the example was 15.3 kg/d, and the overall sludge reduction rate of the system 100 was 11.7 kg/d.

In addition, the total sludge reduction rate during the operation period of the system 100 was 76.8%, and in particular, it can be confirmed that the reduction rates of the third fermentation liquefaction tank 136 and the fermentation synthesis tank 140 account for 70% of the total reduction rate. there is.

Figure 9 is a graph showing the sludge reduction speed and reduction rate during steady state operation in a high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.

Figure 9(a) shows the sludge reduction rate in a normal state, and Figure 9(b) shows the sludge reduction rate for each unit reaction tank in a normal state.

Referring to FIG. 9, after reaching the steady state of the system 100, the sludge reduction rate of the system 100 is 15.47 kg/d, and the overall reduction rate is 97.7%, which is the sludge reduction rate (76.8%) during the entire operation period described above. %) was found to be improved.

In particular, in steady-state operation, the sludge reduction rate (49.1%) in the third fermentation liquefaction tank 136 was significantly increased, and the first to third fermentation liquefaction tanks 132, 134, and 136 had a sludge reduction effect. You can confirm that you are taking initiative. This phenomenon can also be confirmed in the photo of the reaction tank in Figure 10.

Figure 10 is a photograph showing the sludge decomposition state for each unit reaction tank during steady state operation of the high-concentration organic waste treatment and reduction system according to an embodiment of the present invention.

Referring to FIG. 10, similar to the result of the sludge reduction rate in the steady state described above, the third fermentation liquefaction tank 136, the second fermentation liquefaction tank 134, the first fermentation liquefaction tank 132, and the fermentation synthesis tank 140 ), it can be confirmed that the intensity of foam formation on the surface of the reaction tank is high, and it can be seen that actual hydrolysis of sludge in a normal state is taking place in the fermentation liquefaction tank.

Therefore, according to the high-concentration organic waste treatment and reduction system 100 of the present invention, high-concentration organic waste generated in sewage treatment plants, etc. can be reduced through the metabolism of complex microorganisms without mechanical dehydration and additional heat treatment, drying, and incineration processes. , Furthermore, treatment of organic waste can be carried out in a substantially zero-emission form rather than a certain percentage reduction.

When this system 100 is installed in conjunction with existing sewage treatment plant equipment or installed in parallel, the existing mechanical dewatering device can be omitted.

The above description is merely an illustrative explanation of the technical idea of the present embodiment, and those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present embodiment. Accordingly, the present embodiments are not intended to limit the technical idea of the present embodiment, but rather to explain it, and the scope of the technical idea of the present embodiment is not limited by these examples. The scope of protection of this embodiment should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of this embodiment.

100: High-concentration organic waste treatment and reduction system
110: Fermentation mixing tank
120: Seed microorganism culture tank
130: Fermentation liquefaction tank
132: First fermentation liquefaction tank
134: Second fermentation liquefaction tank
136: Third fermentation liquefaction tank
138: Fourth fermentation liquefaction tank
140: Fermentation synthesis tank
146: Return sludge fermentation tank
150: Catalyst synthesis tank
160: Treatment tank

Claims (10)

In a system for zero-emission treatment and reduction of high concentration organic waste using complex microbial fermentation technology,
A fermentation mixing tank that receives organic waste and mixes it with complex fermentation microorganisms to activate complex fermentation microorganisms;
A fermentation liquefaction tank that receives complex fermentation microorganisms and organic waste mixed in the fermentation mixing tank and dissolves and decomposes the organic waste by the action of the complex fermentation microorganisms; and
A fermentation synthesis tank that receives waste from the fermentation liquefaction tank and separates solid and liquid.
A zero-emission reduction system for organic waste, comprising: According to paragraph 1,
The fermentation mixing tank receives complex fermentation microorganisms from the seed microorganism culture tank,
The seed microorganism culture tank cultivates seed microorganisms within the system and supplies complex fermentation microorganisms to the fermentation mixing tank at a preset ratio,
The fermentation mixing tank is a zero-emission reduction system for organic waste, characterized in that the complex fermentation microorganisms are mixed with the incoming organic waste while activating the complex fermentation microorganisms. According to paragraph 1,
The fermentation liquefaction tank,
A plurality of unit fermentation liquefaction tanks are arranged in series to sequentially ferment and decompose organic waste,
A zero-emission reduction system for organic waste, characterized in that the downstream fermentation liquefaction tank among the plurality of unit fermentation liquefaction tanks is 1.5 to 2 times larger than the capacity of the upstream fermentation liquefaction tank. According to paragraph 1,
A zero-emission reduction system for organic waste, wherein the fermentation synthesis tank is one of a membrane bioreactor (MBR), flotation separation tank, centrifugation tank, and gravity sedimentation tank. According to paragraph 4,
A zero-emission reduction system for organic waste, characterized in that the sludge accumulated in the fermentation synthesis tank is returned to the fermentation mixing tank at a preset rate. According to clause 5,
The organic waste zero discharge reduction system further includes a return sludge fermentation tank,
A zero-emission reduction system for organic waste, characterized in that the returned surplus sludge is activated in the returned sludge fermentation tank and then returned to the fermentation mixing tank. According to paragraph 1,
A catalyst synthesis tank is included at the rear of the fermentation synthesis tank,
A zero-emission reduction system for organic waste, characterized in that the catalyst synthesis tank receives and processes treated water discharged from solid-liquid separation in the fermentation synthesis tank. In clause 7,
A zero-emission reduction system for organic waste, characterized in that the catalyst synthesis tank is formed as a fixed bed biofilm reactor. According to paragraph 1,
Organic waste flowing into the fermentation mixing tank is any one selected from the group consisting of surplus sludge generated from a sewage and wastewater treatment device, pre-treated food waste, food waste water and livestock manure, or mixtures thereof. 's zero-emission reduction system. According to paragraph 1,
A zero-emission reduction system for organic waste, characterized in that the fermentation mixing tank, fermentation liquefaction tank, and fermentation synthesis tank are maintained in an aerobic environment, and are repeatedly operated with aeration and rest according to a preset cycle.

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