KR101346752B1 - Biodegradable liquefied waste treating method using complex fermentation product - Google Patents

Abstract

The present invention relates to a method for treating biodegradable liquid waste using a complex fermentation product, capable of massively, effectively and efficiently treating biodegradable waste such as sewage including crushed food waste or leachate thereof or liquid food waste, or liquid waste converted into biodegradable solid waste by liquid fermentation using a fermentation product by aerobic bacteria, anaerobic bacteria and facultative anaerobes from the natural ecosystem, wherein the method for treating biodegradable liquid waste according to the present invention has high economical efficiency, can greatly reduce the bad smells of biodegradable liquid waste, and can increase the decomposing efficiency of fermentation by selectively repeating the process of recovering, liquefying and retreating solids when necessary because thermal treatment or desalination or an additional device for treating leachate or a device for treating solids is not necessary for treating biodegradable waste. [Reference numerals] (AA) Biodegradable liquid waste;(BB) Processed purified water;(CC) Biodegradable waste;(DD) Water

Description

Biodegradable liquid waste disposal method using a compound fermentation product {BIODEGRADABLE LIQUEFIED WASTE TREATING METHOD USING COMPLEX FERMENTATION PRODUCT}

The present invention relates to a method for treating biodegradable liquid waste using a complex fermentation product, and more particularly, liquid fermentation by mixing a composite fermentation product of aerobic and anaerobic bacteria and aerobic bacteria from a natural ecosystem with a biodegradable liquid waste. In addition to the treatment, the solid content is recovered, liquefied again, and then reprocessed, and the present invention relates to a biodegradable liquid waste treatment method using a complex fermentation product for effectively fermenting and decomposing the biodegradable liquid waste.

In general, biodegradable waste or bioowaste is a generic term that refers to waste that can be decomposed by the metabolism of microorganisms. Typical examples of biodegradable waste are food production, distribution, processing and cooking. Food wastes, which are defined as wastes from concentrated aquatic products and leftovers from food, but also include green wastes such as vegetation and flowers, paper wastes, human or livestock manure, sewage, detergent manufacturing wastes, It is used in a broad sense, including biological pharmaceutical manufacturing waste.

So-called food waste, the most typical food waste of the above-mentioned biodegradable wastes, is due to an increase in food waste factors due to our food culture, living conditions, and high-quality foods. It records about 4.1 million tons of food waste, accounting for 28% of the total waste generated.

Biodegradable wastes, such as food wastes, lead to enormous energy waste and greenhouse gas emissions, and are subject to complaints due to odors generated during collection and disposal, as well as particularly high concentrations of wastewater containing biodegradable wastes. It causes the problem of water pollution.

To give a typical example of the seriousness of water pollution from food waste, 7,500 liters of purified water is required to dilute 150 ml of milk to about 2 ppm of BOD in Bidangho and about 150 ml of ramen broth. It is known that 3750 liters are required for 750 liters and 50 ml of cooking oil.

Food waste, which accounts for the majority of biodegradable wastes, contains a lot of excess water and salt, which, unlike other types of household wastes, is not only very difficult and expensive to handle, but also caused by harmful bacteria in its transportation and disposal. Severe odor due to organic decay, as well as the growth of harmful bacteria, including pathogens and the proliferation of pests have a bad effect on public health.

Therefore, various methods of fermenting the biodegradable wastes, in particular food wastes, in solid state as a feed or fertilizer of livestock have been conventionally proposed. However, a separate facility for leachate treatment according to dehydration is required and prevention of salt damage In order to remove the excess salt, there is a problem in that a separate desalination process is required.

In addition, landfilling of food waste is based on the problem of groundwater contamination caused by the generation of large amounts of leachate, the installation of methane gas holes, the gradual settlement of landfills due to methane and water discharge, the proliferation of pests and the generation of odors. Due to the opposition of local residents, there is considerable difficulty in securing landfills.

Various methods of incineration of food waste due to the difficulty of securing landfills have also been proposed in the related art, but there is a problem in that the energy cost burden is relatively large when incineration due to the large amount of water contained in the food waste.

In recent years, various dry food waste treatment apparatuses for drying food waste by high temperature treatment and various food waste treatment apparatuses using microorganisms have been proposed.

Here, the high temperature dry food waste treatment apparatus removes moisture contained in the food waste by heat, thereby reducing the volume and weight of the food waste to treat the food waste, but the energy cost is high because drying takes a long time. In addition to the large problem, there is a problem that the problem of reprocessing the food waste that is dried at high temperature remains.

The food waste treatment apparatus using the microorganism is to decompose food waste by using aerobic and anaerobic microorganisms, or to decompose solid food waste, so that it takes a long time to decompose and separates a large amount of leachate treatment. There is a problem that means are required.

On the other hand, some techniques for decomposing food wastes by fermentation as liquids have been proposed. Typical examples thereof are as follows.

First, Patent No. 1811384 (registered on Dec. 09. 04.) puts oak wood chips and microorganisms in a heated agitation tank and microbial cultivation process and food wastes by stirring for 8-12 hours while periodically spraying hot water. It proposes a liquid extinction treatment method of food waste consisting of a decomposition process in which the food waste is injected periodically and agitated under oxygen supply for 10 to 14 hours, but this method uses a liquid discharge through a discharge guide communicating with the lower perforation part. Since it adopts a structure that discharges water continuously, there is a concern that the food waste and leachate is continuously discharged to the outside causing water pollution, which is essentially solid fermentation, not liquid fermentation.

In addition, Patent No. 1285655 (registered on July 1, 2013) is a treatment device composed of a ceramic bowl serving as a microbial carrier in water and a pair of agitating tanks into which food waste is put, and the bottom cristolab is gradually lowered toward the outlet. By forming a microbial carrier in the water, the non-fermented food waste is limitedly discharged. However, if the amount of the input food waste is large or the amount of inflow is large, the food waste is immediately discharged through the overflow outlet hole and the non-fermentation There is a problem that the leachate in the state is discharged directly through the outlet, and the fermentation in the stirred tank is essentially solid fermentation rather than liquid fermentation.

In addition, Korean Patent No. 11174251 (Dec. 08.08.) Proposes a device for separating and treating leachate and sludge by adopting a housing structure having a leachate sterilization part and a sludge fermentation part of food, but leachate is treated by ultraviolet or ozone. It is only a discharge after sterilization and is not related to liquid fermentation. Moreover, they are not scale to be applied to domestic sewage facilities as scale to be applied to homes, restaurants or large feeding facilities.

Registered Patent No.1181384 (12.09.04. Registered) Registered Patent No. 1285655 (registered July 1, 2013) Registered Patent No.1174251 (Dec. 08.08. Registered)

Accordingly, a first object of the present invention is to provide a biodegradable liquid waste disposal method using a composite fermentation product for large-scale effective treatment of biodegradable liquid waste such as food waste crushed powder or leachate thereof or municipal wastewater containing liquid food waste. It is to.

The second object of the present invention is to mix the liquid fermentation of aerobic bacteria and anaerobic bacteria and anaerobic bacteria from natural ecosystems with biodegradable liquid waste and liquid fermentation, and to recover the solid content and re-liquefy and then reprocess By repeating the process to convert the biodegradable solid waste into liquid waste to provide a liquid waste treatment method using a complex fermentation that can be effectively fermented by liquid fermentation having a higher fermentation efficiency than solid phase fermentation.

The third object of the present invention is a biodegradable liquid waste treatment method using a composite fermentation product having high treatment economics because it does not require a heat treatment or desalination treatment, or a separate leachate treatment apparatus or a solids treatment apparatus in treating biodegradable waste. It is to provide.

It is a fourth object of the present invention to provide a biodegradable liquid waste treatment method using a complex fermentation product which can significantly reduce the odor of biodegradable liquid waste by liquid fermentation.

According to one preferred aspect of the present invention for smoothly achieving the first, third, and fourth objects described above, (a) 100 parts by weight of water at 37-42 ° C. in an anaerobic fermenter 1.5-3.0 parts by weight of molasses are mixed with stirring, and then the same amount of at least three leaves and rice straws selected from the group consisting of bamboo leaves, pine leaves, plum leaves, peach leaves, chestnut leaves, and persimmon leaves. ), Add 1 to 4 parts by weight and 0.1 to 0.8 parts by weight of rice bran, and perform anaerobic fermentation at a temperature of 5 to 25 ° C. for 1.5 to 2.5 days, and then (b) 37 to 42 ° C. in an aerobic fermenter. Mix 2.0 to 4.0 parts by weight of molasses with stirring with 100 parts by weight of water, add 0.1 to 0.5 parts by weight of the above-mentioned anaerobic fermentation supernatant and 1 to 2 parts by weight of anaerobic fermentation by-products as precipitates, and vent at 15-30 l / min. 5-25 days for 1.5-2.5 days aeration) Perform aerobic fermentation at a temperature of ℃, and then (c) transfer the fermentation product of the aerobic fermentation tank to a facultative anaerobic fermenter, 0.5 to 1 hour 10 to 50 l / min 1 to 3 times a day By carrying out the anaerobic fermentation fermentation at a temperature of 5 ~ 25 ℃ for 10 to 20 days while aeration, (A) to produce a composite fermentation product containing the bacteria and extracellula enzyme, (B) biodegradable in a decomposition fermentation tank 0.01-5 parts by weight of the above-mentioned fermentation compound is added to 100 parts by weight of the liquid waste, followed by fermentation for 0.3-15 days, preferably 0.5-3 days, to decompose the biodegradable waste, and (C) the fermentation product from the decomposition fermentation tank. A biodegradable liquid waste disposal method is provided using a complex fermentation product, which is composed of a feedstock, a supernatant drained, and a sediment back to the cracking fermentation tank.

According to a preferred embodiment of the present invention for smoothly achieving the second object, 30 to 45 parts by weight of biodegradable waste is mixed with 100 parts by weight of water and pulverized using a disposer to liquefy the biodegradable waste. Then, the biodegradable liquid waste treatment method using a composite fermentation product to be transferred to the adjustment tank, stirred, filtered and the solid content is returned to the disposer, and the biodegradable liquid waste containing a solid content of a predetermined size or less is transferred to the fermenter. This is provided.

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The biodegradable liquid waste may be food waste pulverized liquid pulverized with water in a household sewage or a disposer including leachate of food waste.

In addition, the complex fermentation product may be added to the adjustment tank.

The filtration may be to pass a solid content of 0.1mm to 5mm or less through the screen.

A post-decomposition fermentation tank may also be placed downstream of the above-described degradation fermentation tank to further decompose the biodegradable liquid waste.

In addition, the undecomposed solids of the above-described decomposition fermentation tank can be returned to the adjustment tank.

The precipitate below the settling tank can be returned to the decomposition fermentation tank again.

It is also possible to place a storage tank downstream of the settling tank to control the discharge.

The biodegradable liquid waste treatment method according to the present invention is a liquid waste converted from biodegradable liquid waste or biodegradable solid waste such as municipal waste including food waste crushed powder or leachate thereof or liquid food waste, from a natural ecosystem. It can be effectively and efficiently treated on a large scale by liquid fermentation using a complex fermentation product by aerobic bacteria, anaerobic bacteria, and anaerobic bacteria, and in the treatment of biodegradable wastes, heat treatment or desalination treatment, or a separate leachate treatment device or It does not require a solids treatment device, so it has high processing economics and can significantly reduce the odor of biodegradable liquid wastes. Optionally, if necessary, the solids can be recovered, liquefied and reprocessed. As a result, the fermentation decomposition efficiency can be further increased.

1 is a biodegradable liquid waste treatment process diagram using a composite fermentation product according to the present invention.

First of all, the term 'biodegradable waste' as used herein is used synonymously with the term 'biowaste' and is a generic term for waste that can be decomposed by the metabolism of microorganisms. Food waste, defined as aquatic fish waste from food processing, distribution, processing and cooking, and food residues left over from food, green waste such as vegetation and flowers, paper processing waste, manure, sewage and cleaning products for humans and livestock. It should be understood in a broad sense, including manufacturing waste, biological pharmaceutical manufacturing waste, etc.

In addition, the term 'biodegradable liquified waste', as used throughout this specification, refers not only to liquid biodegradable waste in the strict sense, but also to the agitation of solids in microns or millimeters, or in centimeters. It needs to be understood to mean the dispersed state, including the solids dispersed by.

Hereinafter, the present invention will be described in detail with reference to a process diagram using the biodegradable liquid waste treatment apparatus 1 using the composite fermentation product of FIG. 1.

Biodegradable liquid waste treatment method using a composite fermentation according to the present invention basically consists of the following steps.

(A) Complex fermentation step:

The complex fermentation product used in the present invention includes a multi-fermentative proliferating cell and an extracellula enzyme secreted by these cells, and includes the following steps.

(a) Anaerobic fermentation step:

1.5-3.0 parts by mol of molasses were mixed with an impeller (5) while stirring 100 parts by weight of water at 37-42 ° C. in an anaerobic fermenter (2), followed by bamboo leaves, pine leaves, plum leaves, peach leaves 1 to 4 parts by weight in total and 1 to 4 parts by weight of rice bran and 0.1 to 0.8 parts by weight of rice bran in equal amounts, respectively, selected from the group consisting of chestnut leaves and persimmon leaves. Anaerobic fermentation is carried out at temperature.

Molasses and rice bran are nutrient medium components for anaerobic natural fungi derived from bamboo leaves, pine leaves, plum leaves, peach leaves, chestnut leaves, or persimmon leaves and rice straw.

(b) aerobic fermentation step:

In an aerobic fermenter (3), 2.0 to 4.0 parts by weight of molasses was mixed with 100 parts by weight of water at 37 to 42 ° C. with stirring with an impeller (6), and then 0.1 to 0.5 weight of the anaerobic fermentation supernatant described above. 1 to 2 parts by weight of anaerobic fermentation by-products as parts and precipitates are added, and aerobic fermentation is carried out at a temperature of 5 to 25 ° C. for 1.5 to 2.5 days while aeration at 15 to 30 l / min using an acid pipe 8.

In this process, aerobic fungi, which originate from bamboo leaves, pine leaves, plum leaves, peach leaves, chestnut leaves, or persimmon leaves and rice straw, but which have been inhibited under anaerobic conditions, proliferate.

(c) Facultative anaerobic fermentation steps:

The aerobic fermenter of the above-mentioned aerobic fermenter is transferred to a facultative anaerobic fermenter using a pump 82, and the aeration pipe 9 for 0.5 to 1 hour 1 to 3 times a day while stirring with an impeller 7. Aeration anaerobic fermentation is carried out at a temperature of 5-25 ° C. for 10-20 days while aeration at 10-50 L / min.

In this process, aerobic fermentation and anaerobic fermentation are performed together, resulting in multiple double fermentation of various species, and the number of cells is in stationary atate maintaining 10 ⁸ to 10 ¹⁰ cells / ml. Since it is transferred to the death phase, it is important for the fermentation activation to use the cells of normal phase.

By performing the above three steps to prepare a composite fermentation product for use in the treatment method of the present invention.

In the figure, reference numeral 81 is a pump.

(B) fermentation decomposition step:

100 parts by weight of biodegradable liquid waste such as food waste leachate or live sewage containing liquid food waste transported by the pump 84 in the decomposition fermentation tank 10 in which the stirring impeller 12 and the diffuser 14 are installed. 0.01-5 parts by weight of the above-mentioned composite fermentation product is added and fermented at room temperature for 0.3-15 days, generally 0.5-3 days, to decompose the biodegradable waste.

Herein, when the spawn amount of the composite fermentation product is less than 0.01 part by weight, there is a fear that the biodegradable waste may not be sufficiently decomposed with the fear of malodor due to immature fermentation, and the fermentation decomposition time becomes long, which is not preferable. Exceeding the parts by weight is also undesirable because there is a risk of deteriorating operational economics.

(C) Settling tank transfer step:

The fermented product from the decomposition fermentation tank 10 is transferred to the settling tank 20, the supernatant from which the biodegradable liquid waste is decomposed is drained, and the precipitate is transferred to the decomposition fermentation tank 10 again.

Here, the anaerobic fermentation step of step (A) (c) is aerated at 10 l / min for 0.5 to 1 hour every 6 to 8 hours during the initial 1/3 period, and during the middle 1/3 Aeration or aeration agitation at 20 l / min for 0.5 to 1 hour every 10 to 14 hours, and may be composed of aeration at 50 l / min once a day for the latter 1/3 period.

If necessary, installing at least one or more after-decomposition fermentation tanks 11 downstream of the above-described degradation fermentation bath 10 may be useful for complete decomposition by complete fermentation. The impeller 13 and the diffuser 9 are installed.

In addition, it may be desirable to keep the storage tank 30 downstream of the settling tank 20 to control the discharge amount.

In the present invention, optionally, if necessary, 100 parts by weight of water and 30 to 45 parts by weight of biodegradable solid waste are transferred to the pumps 85 and 86, respectively, and then mixed with each other, using a disposer 40. After pulverizing and liquefying the solid biodegradable waste, it is transferred to the adjustment tank 50 and agitated by the impeller 51 while being vented to the diffuser 52, and then filtered through the filtration screen 60 to obtain a solid having a predetermined size. While being returned to the disposer, biodegradable liquid wastes containing solids of a predetermined size or less may be transferred to the fermentation tank 10 described above.

The filtration screen 60 passes only solids of 0.1 mm to 5 mm or less to be transferred to the decomposition fermentation tank 10 via the transfer line 61, while solids exceeding the above dimensions are directed to the return line 62. By passing back to the disposer 40 to be finely cut again.

The biodegradable liquid waste may be a liquid product in which the pulverized product of the solid food waste pulverized with water by living sewage or a disposer including leachate of food waste is mixed with water.

On the other hand, in some cases, the total amount of the composite fermentation product may be added to the adjustment tank 50 or distributed through the decomposition fermentation tank 10 and the adjustment tank 50 to be introduced via the feeding line 71. It is within the scope of the invention.

In addition, in some cases, the above-mentioned undissolved solid content of the decomposition fermentation tank 10 may be conveyed to the adjustment tank 50 via the conveyance line 72.

In addition, the precipitate in the lower part of the settling tank 20 may be returned to the decomposition fermentation tank 10 via the pump 89.

Test Example 1:

A species identification and heavy metal detection test for the composite fermentation product applied to the biodegradable liquid waste treatment method using the composite fermentation product according to the present invention was commissioned to the National Agricultural Research and Livestock Research Institute, and the results of the analysis are shown in the following table. 1 is shown.

As confirmed from the test results in Table 1 below, the heavy metals were present at a marginal level within acceptable values, and were found to be complexes of various species derived from nature as described in Table 1.

Test Example 2:

In order to confirm in advance the odor removal effect on the contaminated river water flowing living sewage of the composite fermentation product according to the present invention, commissioned the odor test to the Incheon Institute of Health and Environment, the results are shown in Table 2 below.

As can be seen from the results in Table 2 below, a remarkable effect of 95.3% of odor disappearing was confirmed.

1: biodegradable liquid waste treatment apparatus using a composite fermentation product according to the present invention
2: anaerobic fermenter 3: aerobic fermenter
4: flue anaerobic fermenter 5,6,7: impeller
8.9: diffusers
10: decomposition fermenter
11: after-decomposition fermentation tank 12,13: impeller
14,15: diffuser
20: sedimentation tank 30: storage tank
40: disposer
50: adjustment tank
51: impeller 52: diffuser
60: filtration screen
61: transfer line 62: return line
71: feeding line 72: return line
81,82,83,84,85,86,87,88,89: motor
As mentioned above, the present invention has been described in detail, but it is not intended to limit the present invention only to illustrate the present invention, and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention. And this is also within the scope of the present invention.

Claims (10)

Biodegrable liquified waste treatment method using a complex fermentation product consisting of the following steps:
(A) (a) 1.5-3.0 parts by weight of molasses are mixed while stirring 100 parts by weight of water at 37-42 ° C. in an anaerobic fermenter, followed by bamboo leaves, pine leaves, plum leaves, peach leaves and chestnut At least three leaves and rice straw selected from the group consisting of leaves and persimmon leaves are added in equal amounts, respectively, in a total amount of 1 to 4 parts by weight and 0.1 to 0.8 parts by weight of rice bran, at a temperature of 5 to 25 ° C. for 1.5 to 2.5 days. After carrying out anaerobic fermentation,
(b) mixed 2.0-4.0 parts by mol of molasses with 100 parts by weight of water at 37-42 ° C. with stirring in an aerobic fermenter, followed by 0.1-0.5 parts by weight of the above-mentioned anaerobic fermentation supernatant and anaerobic as a precipitate. 1 to 2 parts by weight of the fermentation by-products are added, and aerobic fermentation is carried out at a temperature of 5 to 25 ° C. for 1.5 to 2.5 days while aeration at 15 to 30 l / min, followed by
(c) transfer the fermented products of the aerobic fermenter to a facultative anaerobic fermenter and aeration at 0.5 to 1 hour 10 to 50 l / min once a day for 3 to 5 days at 5 to 25 ° C. By conducting aerobic anaerobic fermentation at temperature,
Preparing a complex fermentation product comprising cells and extracellula enzyme;
(B) adding 0.01-5 parts by weight of the above-mentioned fermentation compound to 100 parts by weight of the biodegradable liquid waste in a fermentation broth to ferment for 0.3-15 days to decompose the biodegradable waste; And
(C) transferring the fermented product from the cracked fermentation tank to the settling tank, draining the supernatant and transferring the precipitate back to the cracked fermentation tank. According to claim 1, 30 to 45 parts by weight of biodegradable waste is mixed with 100 parts by weight of water and pulverized using a disposer to liquefy the biodegradable waste, and then transferred to an adjustment tank, stirred, and filtered to obtain solids. A biodegradable liquid waste disposal method using a complex fermentation product which is returned to a disposer and conveys a biodegradable liquid waste containing solid content of a predetermined size or less to the fermenter described above. delete The method of claim 2, wherein the biodegradable liquid waste is a food waste pulverized liquid pulverized with water by living sewage or a disposer containing leachate of food waste. The method for treating biodegradable liquid waste using composite fermentation product according to claim 2, wherein the complex fermentation product is introduced into an adjustment tank. The biodegradable liquid waste disposal method according to claim 2, wherein the filtration passes only solids of 0.1 mm to 5 mm or less through the screen. The biodegradable liquid waste treatment method according to claim 1 or 2, wherein a post-decomposition fermentation tank is installed downstream of the decomposition fermentation tank to further decompose the liquid waste. The biodegradable liquid waste treatment method according to claim 2, wherein the non-degradable solids of the decomposition fermentation tank are returned to the control tank. The biodegradable liquid waste treatment method according to claim 1 or 2, wherein the sediment under the settling tank is returned to the decomposition fermentation tank. The biodegradable liquid waste disposal method according to claim 1 or 2, wherein the storage fermentation tank is located downstream of the settling tank for controlling the discharge.

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