Environmentally friendly aerobic composting device and aerobic composting method

Abstract

The present invention discloses an environmentally friendly aerobic composting device and an aerobic composting method, which relate to the technical field of aerobic composting, including a reactor, a reaction chamber, a material turning mechanism, an aeration mechanism, a liquid collecting chamber and a gas treatment mechanism. Several layers of reaction chambers and a layer of liquid collecting chamber are arranged in sequence from top to bottom in the reactor, and the reaction chamber and the liquid collecting chamber are arranged vertically. The reaction chamber is used to accommodate reaction materials, and a material turning mechanism and an aeration mechanism are arranged on the reaction chamber. Percolation holes are arranged on the bottom plate of each layer of the reaction chamber, and a gas treatment mechanism is connected to the reactor. The present invention integrates the respective advantages of vertical and horizontal reactors, realizes integrated management of the leachate, solid products and gases generated during the composting process, and facilitates the collection and reuse of solid, liquid and gas products while improving the composting maturity efficiency, further improving the quality of organic fertilizer and the level of resource utilization of agricultural waste, improving the practicality and material conversion efficiency of aerobic fermentation equipment, and reducing pollutant emissions.

Description

Technical Field

[0001] The invention relates to the technical field of aerobic composting, and in particular to an environmentally friendly aerobic composting device and an aerobic composting method. Background Art

[0002] Aerobic fermentation equipment is a kind of equipment that converts organic waste into organic fertilizer. At present, the common aerobic fermentation devices on the market are mainly divided into two types: vertical reactors and horizontal reactors. According to actual needs, different types of reactors such as composting bins, towers, tanks and drums are selected for fermentation. The advantages of vertical reactors are that they save space, have strong processing capacity, stable processing effect, more uniform fermentation effect, low cost and operation difficulty, and are easier to promote on a large scale, but the degree of mechanization is relatively low. The horizontal reactor has high stirring intensity, good material fluidity, simple structure, high degree of automation, and is easy to maintain and clean, but the design of the horizontal reactor will cause the material to be stagnant and dead corners when flowing in the kettle, which may affect the reaction efficiency and mixing uniformity. Summary of the invention

[0003] The purpose of the present invention is to provide an environmentally friendly aerobic composting device and an aerobic composting method to solve the problems existing in the above-mentioned prior art, improve the practicality and material conversion efficiency of aerobic fermentation equipment, and reduce the emission of pollutants.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides an environmentally friendly aerobic composting device, comprising a reactor, a reaction bin, a material turning mechanism, an aeration mechanism, a liquid collecting bin and a gas processing mechanism, wherein a plurality of layers of the reaction bins and a layer of the liquid collecting bin are movably arranged in sequence from top to bottom in the reactor, the reaction bins and the liquid collecting bins are arranged vertically, the reaction bins are used to accommodate reaction materials, the material turning mechanism and the aeration mechanism are arranged on the reaction bins, the bottom plate of each layer of the reaction bins is provided with percolation holes, and the reactor is connected with the gas processing mechanism.

[0006] Preferably, the reaction chamber is a rectangular open box body, sliders are provided on both sides of the reaction chamber, and slide rails are provided on the side walls of the reactor, and the sliders match the slide rails to realize sliding and pulling of the reaction chamber.

[0007] Preferably, the bottom plates of the reaction bins are tilted, and the tilt directions of the bottom plates of the odd-layer and even-layer reaction bins are opposite; the tilt of the bottom plates is 5°-10°, and the infiltration holes are evenly distributed on the lower side of each bottom plate; a number of infiltration holes are arranged at equal intervals and in rows, and the diameter of the infiltration holes is 30mm-50mm and a filter is arranged inside.

[0008] Preferably, the shell of the reactor is a double-layer stainless steel structure, and the inner cavity of the double-layer stainless steel structure is filled with polystyrene foam plastic; each of the reaction chambers is provided with a temperature sensor and an oxygen concentration sensor.

[0009] Preferably, the material turning mechanism comprises a motor and a stirring frame, the motor is connected to the central axis of the stirring frame, the stirring frame is located in the middle of the reaction bin, and the motor is located in a box shell on one side of the reaction bin.

[0010] Preferably, the aeration mechanism comprises a blower, ventilation holes are provided at corresponding positions of the reaction chamber and the reactor, and the blower is connected to the ventilation holes through a pipeline.

[0011] Preferably, the gas processing mechanism comprises an exhaust gas emission pipe and a filler filter element, the filler filter element is arranged in the exhaust gas emission pipe, and the filler filter element comprises at least two of activated carbon, perlite and soil.

[0012] Preferably, an adsorption material is arranged in the liquid collecting bin, and the adsorption material includes bentonite and activated carbon; and a liquid discharge port is provided at the middle position of the height of the liquid collecting bin.

[0013] The present invention also discloses an aerobic composting method, which is based on the above-mentioned environmentally friendly aerobic composting device and specifically comprises the following steps:

[0014] S1, pre-treating the compost raw materials, uniformly mixing all the compost raw materials to form a mixed raw material, and making the moisture content of the mixed raw material within the range of 50%-65% and the pH value within the range of 7-8;

[0015] S2, placing the mixed raw materials in the reaction bins from the top layer to the bottom layer at intervals of half a fermentation cycle, taking out a set amount of fermentation raw materials from the reaction bin of the top layer and placing them in the reaction bins of the next layer after each fermentation cycle, until the reaction bins of the bottom layer, fermenting the materials in the reaction bins of the bottom layer for a fermentation cycle, and taking out the fermented compost from the reaction bins of the bottom layer after the raw materials are completely fermented;

[0016] S3, after the tail gas undergoes a chemical purification reaction with the filler filter element, the remaining CO2 gas is collected and can be used to increase the CO2 concentration in the greenhouse; the leachate in the collection bin is precipitated, the raw material residue or large particles need to be cleaned regularly, and the supernatant can be used as irrigation water for agriculture and forestry.

[0017] Preferably, in S1, the compost raw materials include at least two of straw, vegetable waste, livestock and poultry excrement, and organic household waste, and sawdust is added to the mixed raw materials to adjust the moisture content of the mixed raw materials, and quicklime is added to the mixed raw materials to adjust the pH value of the mixed raw materials;

[0018] Preferably, in S1, 0.5%-1% of earthworms by weight of the mixed raw material are added to the mixed raw material; in S1, 0.1-0.2% of a mixed microbial preparation is added to the mixed raw material, the mixed microbial preparation comprises Bacillus subtilis, Bacillus amyloliquefaciens, Saccharomyces cerevisiae and Trichoderma harzianum distributed in a ratio of 1:1:1:1, the number of live bacteria of Bacillus subtilis is ≥5X107CFU / g, the number of live bacteria of Bacillus amyloliquefaciens is ≥5X107CFU / g, the number of live bacteria of Saccharomyces cerevisiae is ≥1X108CFU / g, and the number of live bacteria of Trichoderma harzianum is ≥1X108CFU / g;

[0019] Preferably, in S2, the fermentation period is 14-28 days.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The present invention combines the respective advantages of vertical and horizontal reactors to achieve integrated management of leachate, solid products and gases generated during the composting process, thereby improving the composting efficiency and facilitating the collection and reuse of solid, liquid and gas products, further improving the quality of organic fertilizer and the level of resource utilization of agricultural waste, enhancing the practicability and material conversion efficiency of aerobic fermentation equipment, and reducing pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic structural diagram of an environmentally friendly aerobic composting device according to an embodiment of the present invention;

[0024] Figure 2 It is a partial structural schematic diagram of an environmentally friendly aerobic composting device in an embodiment of the present invention;

[0025] Figure 3 It is a process flow chart of the environmentally friendly aerobic reactor method in an embodiment of the present invention;

[0026] In the figure: 1-filling filter element, 2-exhaust emission pipe, 3-ventilation hole, 4-slide rail, 5-filtration hole, 6-handle, 7-reaction chamber, 8-stirring frame, 9-drain port, 10-reactor, 11-liquid collecting chamber, 12-motor. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide an environmentally friendly aerobic composting device and an aerobic composting method to solve the problems existing in the prior art, improve the practicality and material conversion efficiency of aerobic fermentation equipment, and reduce the emission of pollutants.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Embodiment 1

[0031] like Figure 1 to Figure 2 As shown, an environmentally friendly aerobic composting device is provided in this embodiment, including a reactor 10, a reaction bin 7, a material turning mechanism, an aeration mechanism, a liquid collecting bin 11 and a gas treatment mechanism. Several layers of reaction bins 7 and a layer of liquid collecting bin 11 are arranged in sequence from top to bottom in the reactor 10. The reaction bin 7 and the liquid collecting bin 11 are arranged vertically. The reaction bin 7 is used to accommodate the reaction materials. The reaction bin 7 is provided with a material turning mechanism and an aeration mechanism. The bottom plate of each layer of the reaction bin 7 is provided with a percolation hole 5. The reactor 10 is connected with a gas treatment mechanism. Among them, the reactor 10 is in the shape of a rectangular cabinet, and the reaction bin 7 and the liquid collecting bin 11 adopt a drawer-type structure, which is convenient for putting in and taking out materials, and convenient for cleaning the liquid collecting bin 11.

[0032] As an optional solution, in this embodiment, the reaction chamber 7 is a rectangular open box body, sliders are provided on both sides of the reaction chamber 7, and slide rails 4 are provided on the side walls of the reactor 10. The sliders 4 match the slide rails to achieve the sliding and pulling of the reaction chamber 7 to form a drawer structure. Each reaction chamber 7 and liquid collection chamber 11 is provided with a handle 7 for easy pulling and opening.

[0033] As an optional solution, in the present embodiment, the bottom plates of the reaction bins 7 are all inclined, and the inclination directions of the bottom plates of the odd-numbered and even-numbered reaction bins 7 are opposite; the inclination of the bottom plates is 5°-10°, and the infiltration holes 5 are evenly distributed on the lower side of each bottom plate, and the infiltration holes 5 of each layer are staggered front and back, which is beneficial to the uniform distribution of seepage water in the reaction bin 7 and ensures the humidity stability during the fermentation process of the material; a number of infiltration holes 5 are arranged at equal intervals and in rows, and the diameter of the infiltration holes 5 is 30mm-50mm and a filter is arranged inside to prevent solid materials from falling into the reaction bin 7 of the lower layer.

[0034] As an optional solution, the shell of the reactor 10 in this embodiment is a double-layer stainless steel structure, and the inner cavity of the double-layer stainless steel structure is filled with polystyrene foam plastic to form an insulation layer structure; each reaction chamber 7 is provided with a temperature sensor and an oxygen concentration sensor, which is convenient for monitoring the temperature and humidity of each layer of the reaction chamber 7 and for adjusting them.

[0035] As an optional solution, the turning mechanism in this embodiment includes a motor 12 and a stirring frame 8, the motor 12 is connected to the central axis of the stirring frame 8, the stirring frame 8 is located in the middle of the reaction bin 7, and the motor 12 is located in the box shell on one side of the reaction bin 7. When the motor 12 is turned on, the stirring frame 8 rotates to turn the material and mix the material. The structure and maintenance are simple, the turning and stirring effect is good, and the energy consumption is low. The material can be evenly mixed and is suitable for a variety of different stirring purposes and operating conditions.

[0036] As an optional solution, the aeration mechanism in this embodiment includes a blower, and ventilation holes 3 are provided at corresponding positions of the reaction chamber 7 and the reactor 10. The blower is connected to the ventilation holes 3 through a pipeline, and a valve is provided on the pipeline to facilitate closed fermentation. In this embodiment, a blower is used to quantitatively supply oxygen to the reactor 10 by forced ventilation, and intermittent ventilation is used to adjust the aeration time in combination with the fermentation temperature to ensure the smooth progress of aerobic composting. This control method is easy to operate and manage, can reduce the anaerobic area inside the pile, and inhibit the formation of CH4, which is an effective method for reducing CH4 emissions during composting.

[0037] As an optional solution, the gas treatment mechanism in this embodiment includes an exhaust pipe 2 and a filler filter 1. The filler filter 1 is arranged in the exhaust pipe 2. The filler filter 1 includes at least two of activated carbon, perlite, and soil. In this embodiment, the exhaust gas is passed into the exhaust pipe 2 filled with fillers. The fillers are activated carbon, perlite, soil, etc. (5% activated carbon, 20% perlite, 75% soil) with adsorption properties. The exhaust gas is purified after a series of chemical reactions with the fillers to remove harmful gases such as NH3, H2S, SO2, etc. The remaining gas is mainly CO2, and then the purified gas is collected, which can be used to increase the concentration of carbon dioxide in the greenhouse, promote crop growth, or as an industrial raw material, etc.

[0038] As an optional solution, in this embodiment, the liquid collecting bin 11 is provided with adsorbent materials, including bentonite and activated carbon; a drainage port 9 is provided at the middle position of the height of the liquid collecting bin 11, which can be sealed with a rubber plug during the fermentation process; a leachate discharge pipe is also connected to the drainage port 9, and the supernatant can be used at any time, and can also be used as irrigation water for agriculture and forestry. Among them, the ratio of activated carbon, bentonite and leachate is 1:2.5:5, and the leachate produced by the first few reaction bins 7 will be collected in the liquid collecting bin 11. Bentonite mainly adsorbs heavy metal ions, while activated carbon has a good removal effect on insoluble organic matter and malodorous pollutants. Such a combination can not only improve the processing efficiency, but also ensure that the effluent water quality reaches a higher standard. After the leachate is precipitated, the raw material residue or large particles accumulate at the bottom of the cabinet, which can be cleaned regularly according to the actual situation.

[0039] Embodiment 2

[0040] like Figure 3 As shown, this embodiment also discloses an aerobic composting method, which is based on the environmentally friendly aerobic composting device of the above embodiment 1 and specifically includes the following steps:

[0041] S1, pre-treating the compost raw materials, uniformly mixing all the compost raw materials to form a mixed raw material, and making the moisture content of the mixed raw material about 50%-65% and the pH value within the range of 7-8;

[0042] S2, the mixed raw materials are sequentially placed in the reaction bin 7 of the uppermost layer to the reaction bin 7 of the lowermost layer at intervals of half a fermentation cycle. After each fermentation cycle, a set amount of fermented raw materials is sequentially taken out from the reaction bin 7 of the uppermost layer and placed in the reaction bin 7 of the next layer, until the reaction bin 7 of the lowermost layer is fermented for a fermentation cycle. After the raw materials are completely fermented, the fermented compost can be taken out from the reaction bin 7 of the lowermost layer.

[0043] S3, after the tail gas undergoes a chemical purification reaction with the filler filter element 1, the remaining CO2 gas is collected and can be used to increase the CO2 concentration in the greenhouse; the leachate in the liquid collection bin 11 is precipitated, the raw material residue or large particles need to be cleaned regularly, and the supernatant can be used as irrigation water for agriculture and forestry.

[0044] As an optional scheme, in S1 of this embodiment, the compost raw materials include at least two of straw, vegetable waste, livestock and poultry manure, and organic domestic waste. The moisture content of the mixed raw materials is adjusted by adding sawdust to the mixed raw materials, and the pH value of the mixed raw materials is adjusted by adding quicklime to the mixed raw materials.

[0045] As an optional solution, in this embodiment S1, 0.5%-1% of earthworms by weight of the mixed raw materials are added to the mixed raw materials. As large soil animals with the largest biomass, earthworms have a developed intestinal system, strong digestive ability and rich microorganisms in the intestine. The excrement and fallen matter of earthworms can provide nutrients for the soil. The metabolic activities of earthworms can also neutralize the soil pH, consume soil organic matter, and promote the growth of soil microorganisms. Microbial growth utilizes carbon sources, and part of the organic carbon is oxidized and decomposed to produce CO2. At the same time, the heat generated by microbial activities increases the temperature of the compost, accelerating the decomposition and stabilization of organic matter.

[0046] As an optional solution, in this embodiment S1, 0.1-0.2% of a microbial mixed preparation is added to the mixed raw material, and the microbial mixed preparation includes Bacillus subtilis, Bacillus amyloliquefaciens, Saccharomyces cerevisiae and Trichoderma harzianum in a ratio of 1:1:1:1, and the number of live bacteria of Bacillus subtilis is ≥5X107CFU / g, the number of live bacteria of Bacillus amyloliquefaciens is ≥5X107CFU / g, the number of live bacteria of Saccharomyces cerevisiae is ≥1X108CFU / g, and the number of live bacteria of Trichoderma harzianum is ≥1X108CFU / g. The addition of microbial agents can accelerate the degradation of organic matter and convert it into beneficial humus substances, while maintaining the stability of elements such as nitrogen, phosphorus and potassium.

[0047] As an optional solution, in S2 of this embodiment, the fermentation period is 14-28 days.

[0048] Since traditional dynamic composting has the advantage of a long high temperature period, but has the disadvantage of insufficient fermentation, in this embodiment, new waste is mixed with incompletely decomposed waste, which is beneficial to improving the composting efficiency, allowing the material to be fully decomposed, and is also beneficial to shortening the feeding cycle interval, reducing nitrogen loss, improving the compost quality, and having a good nitrogen retention effect.

[0049] Embodiment 3

[0050] In this embodiment, the reactor 10 is composed of three drawer-type reaction bins 7 and a liquid collecting bin 11, and aerobic composting is performed by batch feeding:

[0051] First, the compost raw materials are pretreated. The raw materials are mainly straw, vegetable waste, livestock and poultry feces, organic household garbage, etc. (the distribution ratio of the raw materials can be determined according to the moisture content and pH range value according to the selected raw materials). The materials are evenly mixed, the moisture content is adjusted to about 60%, and the pH value is within the range of 7-8, and then placed in the reaction chamber 7 of the compost reaction system. Among them, the moisture content of the mixed material can be adjusted by adding easily available dry biomass such as sawdust to the organic waste, and the pH value of the mixed material can be adjusted by adding substances such as quicklime.

[0052] Put 1 portion of the prepared agricultural waste mixture in the first layer of the reaction chamber, and 7-14 days later put 2 / 3 of the mixture in the second layer of the reaction chamber, and so on, until 2 / 3 of the mixture is put in the third layer of the reaction chamber. The time required for the first layer of materials to complete composting fermentation is approximately 14-28 days, and then one-third of the solid materials are put into the second layer of the reaction chamber and mixed with the materials therein, and at the same time, new waste is put into the first layer. After a week, one-third of the solid products in the second layer of the reaction chamber are put into the third layer of the reaction chamber and mixed. At this time, the solid products can be taken out from the first layer of the reaction chamber for use, and new agricultural waste can be added in time. After the third layer of the reaction chamber completes a fermentation cycle, the solid products after composting can be taken out from the third layer of the reaction chamber at any time and used as organic fertilizer.

[0053] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An environmentally friendly aerobic composting device, characterized in that: It comprises a reactor, a reaction bin, a material turning mechanism, an aeration mechanism, a liquid collecting bin and a gas treatment mechanism. Several layers of the reaction bins and one layer of the liquid collecting bin are movably arranged in sequence from top to bottom in the reactor. The reaction bins and the liquid collecting bins are arranged vertically. The reaction bins are used to accommodate reaction materials. The reaction bins are provided with the material turning mechanism and the aeration mechanism. The bottom plate of each layer of the reaction bins is provided with infiltration holes. The reactor is connected with the gas treatment mechanism. The bottom plates of the reaction bins are all inclined, and the inclination directions of the bottom plates of the odd-numbered and even-numbered reaction bins are opposite. The shell of the reactor is a double-layer stainless steel structure, and the inner cavity of the double-layer stainless steel structure is filled with polystyrene foam plastic. The inclination of the bottom plates is 5°-10°, and the infiltration holes are evenly distributed on the lower side of each bottom plate. Adsorption material is arranged in the liquid collecting bin, and the adsorption material includes bentonite and activated carbon. A liquid discharge port is provided in the middle of the height of the liquid collecting bin.

2. The environmentally friendly aerobic composting device according to claim 1, characterized in that: The reaction chamber is a rectangular open box body, with sliders disposed on both sides of the reaction chamber, and slide rails disposed on the side walls of the reactor, and the sliders match the slide rails to achieve sliding and pulling of the reaction chamber.

3. The environmentally friendly aerobic composting device according to claim 1, characterized in that: The infiltration holes are arranged in a plurality at equal intervals and in rows, the diameter of the infiltration holes is 30 mm-50 mm and a filter screen is arranged inside the infiltration holes.

4. The environmentally friendly aerobic composting device according to claim 1, characterized in that: Each of the reaction chambers is provided with a temperature sensor and an oxygen concentration sensor.

5. The environmentally friendly aerobic composting device according to claim 1, characterized in that: The material turning mechanism comprises a motor and a stirring frame, wherein the motor is connected to the central axis of the stirring frame, the stirring frame is located in the middle of the reaction bin, and the motor is located in a box shell on one side of the reaction bin.

6. The environmentally friendly aerobic composting device according to claim 1, characterized in that: The aeration mechanism comprises a blower, and ventilation holes are arranged at corresponding positions of the reaction chamber and the reactor, and the blower is connected with the ventilation holes through a pipeline.

7. The environmentally friendly aerobic composting device according to claim 1, characterized in that: The gas processing mechanism comprises an exhaust gas discharge pipe and a filler filter element. The filler filter element is arranged in the exhaust gas discharge pipe, and the filler filter element comprises at least two of activated carbon, perlite and soil.

8. An aerobic composting method, based on the environmentally friendly aerobic composting device according to any one of claims 1 to 7, characterized in that: The specific steps include: S1, pre-treating the compost raw materials, uniformly mixing all the compost raw materials to form a mixed raw material, and making the moisture content of the mixed raw material within the range of 50%-65% and the pH value within the range of 7-8; S2, placing the mixed raw materials in the reaction bins from the top layer to the bottom layer at intervals of half a fermentation cycle, taking out a set amount of fermentation raw materials from the reaction bin of the top layer and placing them in the reaction bins of the next layer after each fermentation cycle, until the reaction bins of the bottom layer, fermenting the materials in the reaction bins of the bottom layer for a fermentation cycle, and taking out the fermented compost from the reaction bins of the bottom layer after the raw materials are completely fermented; S3, after the tail gas undergoes a chemical purification reaction with the filler filter element, the remaining CO2 gas is collected and can be used to increase the CO2 concentration in the greenhouse; the leachate in the collection bin is precipitated, the raw material residue or large particles need to be cleaned regularly, and the supernatant can be used as irrigation water for agriculture and forestry.

9. The aerobic composting method according to claim 8, characterized in that: In S1, the compost raw materials include at least two of straw, vegetable waste, livestock and poultry manure, and organic household waste. The moisture content of the mixed raw materials is adjusted by adding sawdust to the mixed raw materials, and the pH value of the mixed raw materials is adjusted by adding quicklime to the mixed raw materials. In S1, 0.5%-1% of earthworms by weight of the mixed raw materials are added to the mixed raw materials. In S1, 0.1-0.2% of a mixed microbial preparation is added to the mixed raw materials, and the mixed microbial preparation includes Bacillus subtilis, Bacillus amyloliquefaciens, Saccharomyces cerevisiae, and Trichoderma harzianum distributed in a ratio of 1:1:1:1, the number of live bacteria of Bacillus subtilis is ≥5X107CFU / g, the number of live bacteria of Bacillus amyloliquefaciens is ≥5X107CFU / g, the number of live bacteria of Saccharomyces cerevisiae is ≥1X108CFU / g, and the number of live bacteria of Trichoderma harzianum is ≥1X108CFU / g. In S2, the fermentation cycle is 14-28 days.

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