Electric field reinforced organic waste treatment method

Abstract

The invention relates to the technical field of waste recycling, in particular to an electric field reinforced organic waste treatment method which comprises the following steps: (1) crushing and separating organic waste to obtain a crushed product; (2) mixing the crushed product with water to form a mixed product; (3) carrying out hydrothermal reaction on the mixed product to obtain a hydrothermal product; (4) carrying out solid-liquid separation on the hydrothermal product to obtain a first liquid-phase product and a first solid-phase product; (5) introducing the first liquid-phase product into a bipolar membrane reaction tank, and electrifying for reaction to obtain an acid solution, an alkali solution and a second liquid-phase product; the acid liquor and the alkali liquor are used for being added into (3) to participate in the reaction; 6, the first solid-phase product is subjected to electric field intensified composting treatment, and then the organic fertilizer containing humic acid is prepared. The method has the advantages that organic waste can be effectively utilized, kitchen waste, livestock and poultry manure and the like are closely combined through a solid-phase treatment route and a liquid-phase treatment route, introduction of exogenous additives is reduced, the treatment efficiency is improved, and the method is suitable for industrial production. The use cost is reduced.

Description

A method for treating organic waste by enhancing electric field Technical Field

[0001] The present invention relates to the technical field of waste resource utilization, in particular to an electric field enhanced organic waste treatment method. Background Art

[0002] Fertilization is an important resource for the utilization of biomass-containing organic waste, such as kitchen waste and livestock and poultry manure, and a crucial avenue for promoting low-carbon agriculture. Cow manure, a typical livestock and poultry manure source, is a high-volume resource, accounting for approximately 32.8% of my country's total livestock and poultry manure. It contains 14.5% organic matter, 0.30-0.45% nitrogen, 0.15-0.25% phosphorus, and 0.10-0.15% potassium. However, aerobic composting of kitchen waste and cow manure can lead to slow decomposition and low fertilizer efficiency.

[0003] Under certain operating conditions, hydrothermal technology can efficiently and directionally convert organic waste into carbon-fixing materials, humic acid, etc. However, the existing hydrothermal method for treating biomass-containing organic waste to obtain high-content humic acid fertilizer still needs to be improved. To this end, the present invention proposes an electric field-enhanced organic waste treatment method to solve the above-mentioned problem. Summary of the Invention

[0004] The object of the present invention is to provide an electric field enhanced organic waste treatment method to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for treating organic waste by electric field enhancement, comprising:

[0006] Step (1) crushing and separating the organic waste to obtain crushed products;

[0007] Step (2) mixing the crushed product with water to form a mixed product;

[0008] Step (3) performing a hydrothermal reaction on the mixed product to obtain a hydrothermal product;

[0009] Step (4) performing solid-liquid separation on the hydrothermal product to obtain a first liquid phase product and a first solid phase product;

[0010] Step (5) introducing the first liquid phase product into a bipolar membrane reaction cell, and obtaining an acid solution, an alkaline solution, and a second liquid phase product after an electric reaction; the acid solution and the alkaline solution are added to the step (3) to participate in the reaction;

[0011] In step (6), the first solid phase product is subjected to electric field enhanced composting treatment to obtain an organic fertilizer containing humic acid.

[0012] Preferably, the organic waste includes at least one of straw, kitchen waste, and livestock and poultry manure.

[0013] Preferably, the hydrothermal reaction includes at least one acidic hydrothermal reaction and one alkaline hydrothermal reaction; the temperature of the hydrothermal reaction is 150-220°C;

[0014] The acidic hydrothermal reaction uses the acid solution prepared in step (5), and the pH range of the acidic hydrothermal reaction environment is 1-6;

[0015] The alkaline hydrothermal reaction uses the alkaline solution prepared in step (5), and the pH range of the alkaline hydrothermal reaction environment is 9-12.

[0016] Preferably, the hydrothermal reaction is carried out in sequence as an acidic hydrothermal reaction and an alkaline hydrothermal reaction, or the hydrothermal reaction is carried out in sequence as an alkaline hydrothermal reaction and an acidic hydrothermal reaction, and the time of the acidic reaction or the alkaline reaction is 1 to 3 hours.

[0017] Preferably, the acidic hydrothermal reaction and the alkaline hydrothermal reaction in the hydrothermal reaction are carried out simultaneously, and the specific steps are as follows:

[0018] First, the mixture is divided into two equal parts by mass, a first part and a second part;

[0019] The acidic hydrothermal reaction is performed on the first part for a reaction time of 0.4 to 1.2 hours.

[0020] The alkaline hydrothermal reaction is performed on the second part for a reaction time of 0.4 to 1.2 hours.

[0021] Then, the first part and the second part of the hydrothermal reaction product are mixed to obtain the hydrothermal product.

[0022] Preferably, the second liquid phase product in step (5) further includes a post-processing step, and the post-processing step is as follows:

[0023] The acid solution produced in step (5) is extracted, mixed with the second liquid phase product and adjusted to an acidic environment with a pH of 2-4,

[0024] The mixture was then allowed to stand for 2 hours, and solid-liquid separation was performed to obtain a third liquid phase product and a second solid phase product; the second solid phase product included humic acid.

[0025] Preferably, the mixed product of step (2) is obtained by pre-treating the crushed product and water in an electric field, wherein the electric field pre-treatment is carried out in the following steps:

[0026] Hydrothermal pre-reaction: 80-110℃, 30-50kPa pressure, hydrothermal reaction for 0.5-1.2h to obtain the pre-reaction product;

[0027] Electric field enhanced reaction: placing the pre-reaction product in an external electric field, hydrothermally reacting at 100° C. and 10-50 kPa pressure for 0.2-0.5 h to obtain the mixed product.

[0028] Preferably, the second solid phase product is transported to the composting treatment in the step (6) for electric field enhanced composting treatment, the electric field for the composting treatment is generated by electrodes or plates, and the electrode voltage is 0.5-1.5V.

[0029] Preferably, the steps of the electric field enhanced composting treatment are:

[0030] Material preparation: placing the first solid phase product in a composting tank;

[0031] An electric field arrangement is performed by arranging electrodes in the first solid phase product and applying electricity to form an electric field;

[0032] Temperature-raising composting: starting composting of the first solid phase until the temperature rises to 50-80°C;

[0033] Exogenous addition: After the compost temperature stabilizes at 50-80°C for three days, evenly add the second solid phase to the first solid phase to form a compost material, stir evenly and continue composting for 1-3 days;

[0034] High temperature stacking, maintaining the external environment and the internal temperature of the compost material at 50-80°C, and packing the compost material into multiple compost bags under high temperature environment;

[0035] Cooling composting: multiple compost bags are transported to a static cooling workshop, stacked to form a rectangular cooling composting space, and the length, width or height of the composting space is at least greater than 1m.

[0036] Preferably, the composting process includes: the compost bag includes an organic solid waste container, the container includes a compost bag formed by pressing or sewing a nano compost membrane, the nano compost membrane includes a membrane body made of PTFE material, the nano compost membrane is composed of a polyester fiber layer resistant to ultraviolet oxidation, an expanded polytetrafluoroethylene semipermeable membrane material layer, and a polyester fiber material layer resistant to acid and alkali corrosion; the compost bag is further provided with at least one inner bag or outer bag;

[0037] The cooling workshop also includes at least:

[0038] an electric field covering the organic solid waste container, the electric field being generated by electrodes;

[0039] An outer cover, wherein the outer cover is made of the nano composting film.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a schematic flow chart of the method in Example 1 of the present invention;

[0043] FIG2 is a schematic diagram of a method flow chart in Example 2 of the present invention;

[0044] FIG3 is a schematic diagram of a method flow chart in Example 3 of the present invention;

[0045] FIG4 is a schematic flow chart of the method in Example 4 of the present invention. DETAILED DESCRIPTION

[0046] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] Please refer to Figures 1 to 4. The present invention provides a technical solution:

[0048] Example 1: A method for treating organic waste by electric field enhancement, comprising:

[0049] Step (1) crushing and separating the organic waste to obtain crushed products;

[0050] Step (2) mixing the crushed product with water to form a mixed product;

[0051] Step (3) performing a hydrothermal reaction on the mixed product to obtain a hydrothermal product;

[0052] Step (4) performing solid-liquid separation on the hydrothermal product to obtain a first liquid phase product and a first solid phase product;

[0053] Step (5) introducing the first liquid phase product into a bipolar membrane reaction cell, and applying electricity to react to obtain an acid solution, an alkaline solution, and a second liquid phase product; the acid solution and the alkaline solution are added to step (3) to participate in the reaction;

[0054] In step (6), the first solid phase product is subjected to electric field enhanced composting treatment to obtain an organic fertilizer containing humic acid.

[0055] The organic waste includes at least one of straw, kitchen waste, and livestock and poultry manure.

[0056] The hydrothermal reaction includes at least one acidic hydrothermal reaction and one alkaline hydrothermal reaction; the temperature of the hydrothermal reaction is 150-220°C.

[0057] The acidic hydrothermal reaction uses the acid solution prepared in step (5), and the pH range of the acidic hydrothermal reaction environment is 1-6;

[0058] The alkaline hydrothermal reaction uses the alkaline solution prepared in step (5), and the environmental pH range of the alkaline hydrothermal reaction is 9~12.

[0059] Example 2: The hydrothermal reaction is carried out in sequence as an acidic hydrothermal reaction and an alkaline hydrothermal reaction, or the hydrothermal reaction is carried out in sequence as an alkaline hydrothermal reaction and an acidic hydrothermal reaction, and the time of the acidic reaction or the alkaline reaction is 1 to 3 hours.

[0060] Example 3: The acidic hydrothermal reaction and the alkaline hydrothermal reaction are carried out simultaneously in the hydrothermal reaction. The specific steps are as follows:

[0061] First, the mixture is divided into two equal parts by mass, the first part and the second part;

[0062] The first part is subjected to acidic hydrothermal reaction with a reaction time of 0.4~1.2h.

[0063] The second part is subjected to alkaline hydrothermal reaction with a reaction time of 0.4~1.2h.

[0064] Then, the first part and the second part of the hydrothermal reaction product are mixed to obtain a hydrothermal product.

[0065] The second liquid phase product in step (5) further includes a post-processing step, which is as follows:

[0066] The acid solution produced in step (5) is extracted, mixed with the second liquid phase product and adjusted to an acidic environment with a pH of 2-4,

[0067] After standing for 2 hours, solid-liquid separation was performed to obtain a third liquid phase product and a second solid phase product; the second solid phase product included humic acid.

[0068] Example 4: In some embodiments of the present invention, the mixed product of step (2) is obtained by pre-treating the crushed product and water in an electric field, and the electric field pre-treatment steps are as follows:

[0069] Hydrothermal pre-reaction: 80-110℃, 30-50kPa pressure, hydrothermal reaction for 0.5-1.2h to obtain the pre-reaction product;

[0070] Electric field enhanced reaction: The pre-reaction product is placed in an external electric field, and hydrothermally reacted at 100°C and 10~50kPa pressure for 0.2-0.5h to obtain a mixed product.

[0071] The second solid phase product is transported to the composting treatment in step (6) for electric field enhanced composting treatment. The electric field for composting treatment is generated by electrodes or plates, and the electrode voltage is 0.5-1.5V.

[0072] The steps of electric field enhanced composting are:

[0073] Material preparation: placing the first solid phase product in a composting tank;

[0074] An electric field arrangement is performed by arranging electrodes in the first solid phase product and applying electricity to form an electric field;

[0075] Temperature composting: start composting on the first solid phase and wait until the temperature rises to 50-80℃;

[0076] Exogenous addition: After the compost temperature stabilizes at 50-80°C for three days, evenly add the second solid phase to the first solid phase to form compost material, stir evenly and continue composting for 1-3 days;

[0077] High temperature stacking, maintaining the external environment and the internal temperature of the compost material at 50-80℃, and packing the compost material into multiple compost bags under high temperature environment;

[0078] Cooling composting: transport multiple compost bags to a static cooling workshop, stack them and form a rectangular cooling composting space. The length, width or height of the composting space is at least greater than 1m.

[0079] In some embodiments of the present invention, a compost bag includes an organic solid waste container, the container includes a compost bag formed by pressing or sewing a nano-composting membrane, the nano-composting membrane includes a membrane body made of PTFE material, the nano-composting membrane is composed of a polyester fiber layer resistant to ultraviolet oxidation, an expanded polytetrafluoroethylene semipermeable membrane material layer, and a polyester fiber material layer resistant to acid and alkali corrosion; the compost bag is further provided with at least one inner bag or outer bag;

[0080] The cooling workshop shall also include at least:

[0081] an electric field covering the organic solid waste container, the electric field being generated by electrodes;

[0082] An outer cover made of nano-composted film.

[0083] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for treating organic waste by electric field enhancement, characterized in that: include Step (1) crushing and separating the organic waste to obtain crushed products; Step (2) mixing the crushed product with water to form a mixed product; Step (3) performing a hydrothermal reaction on the mixed product to obtain a hydrothermal product; Step (4) performing solid-liquid separation on the hydrothermal product to obtain a first liquid phase product and a first solid phase product; Step (5) introducing the first liquid phase product into a bipolar membrane reaction cell, and obtaining an acid solution, an alkaline solution, and a second liquid phase product after an electric reaction; the acid solution and the alkaline solution are added to the step (3) to participate in the reaction; Step (6) The first solid phase product is subjected to electric field enhanced composting treatment to obtain an organic fertilizer containing humic acid.

2. The method for treating organic waste by electric field enhancement according to claim 1, characterized in that: The organic waste includes at least one of straw, kitchen waste, and livestock and poultry manure.

3. The method for treating organic waste by electric field enhancement according to claim 1, characterized in that: The hydrothermal reaction includes at least one acidic hydrothermal reaction and one alkaline hydrothermal reaction; the temperature of the hydrothermal reaction is 150-220°C; The acidic hydrothermal reaction uses the acid solution prepared in step (5), and the pH range of the acidic hydrothermal reaction environment is 1-6; The alkaline hydrothermal reaction uses the alkaline solution prepared in step (5), and the environmental pH range of the alkaline hydrothermal reaction is 9-12.

4. The method for treating organic waste by electric field enhancement according to claim 3, characterized in that: The hydrothermal reaction is carried out in sequence as an acidic hydrothermal reaction and an alkaline hydrothermal reaction, or the hydrothermal reaction is carried out in sequence as an alkaline hydrothermal reaction and an acidic hydrothermal reaction, and the time of the acidic reaction or the alkaline reaction is 1 to 3 hours.

5. The method for treating organic waste by electric field enhancement according to claim 3, characterized in that: In the hydrothermal reaction, the acidic hydrothermal reaction and the alkaline hydrothermal reaction are carried out simultaneously, and the specific steps are as follows: First, the mixture is divided into a first part and a second part of two equal weight portions; The acidic hydrothermal reaction is performed on the first part for a reaction time of 0.4 to 1.2 hours. The alkaline hydrothermal reaction is performed on the second part for a reaction time of 0.4 to 1.2 hours. Then, the first part and the second part of the hydrothermal reaction product are mixed to obtain the hydrothermal product.

6. The method for treating organic waste by electric field enhancement according to claim 3, characterized in that: The second liquid phase product in step (5) further comprises a post-processing step, and the post-processing step is as follows: The acid solution produced in step (5) is extracted, mixed with the second liquid phase product and adjusted to an acidic environment with a pH of 2-4, After standing for 2 hours, the solid-liquid separation was performed to obtain a third liquid phase product and a second solid phase product; the second solid phase product included humic acid.

7. The method for treating organic waste by electric field enhancement according to claim 1, characterized in that: The mixed product of step (2) is obtained by pre-treating the crushed product and water through an electric field, wherein the electric field pre-treatment is performed in the following steps: Hydrothermal pre-reaction: 80-110℃, 30~50kpa pressure hydrothermal reaction for 0.5-1.2h to obtain the pre-reaction product; Electric field enhanced reaction: the pre-reaction product is placed in an external electric field, and subjected to a hydrothermal reaction at 100° C. and a pressure of 10 to 50 kPa for 0.2 to 0.5 h to obtain the mixed product.

8. The method for treating organic waste by electric field enhancement according to claim 7, characterized in that: The second solid phase product is transported to the composting treatment in the step (6) for electric field enhanced composting treatment, wherein the electric field for the composting treatment is generated by electrodes or plates, and the electrode voltage is 0.5-1.5V.

9. The method for treating organic waste by electric field enhancement according to claim 7, characterized in that: The steps of the electric field enhanced composting process are: Material preparation, placing the first solid phase product in a composting tank; An electric field arrangement is to arrange electrodes in the first solid phase product and apply electricity to form an electric field; Temperature-raising composting: starting composting of the first solid phase until the temperature rises to 50-80°C; Exogenous addition: after the composting temperature is stabilized at 50-80°C for three days, the second solid phase is evenly added to the first solid phase to form a composting material, which is stirred evenly and continues to be composted for 1-3 days; High temperature stacking, maintaining the external environment and the internal temperature of the compost material at 50-80° C., and packing the compost material into a plurality of compost bags under high temperature environment; Cooling composting, multiple compost bags are transported to a static cooling workshop, stacked to form a rectangular cooling composting space, and the length, width or height of the composting space is at least greater than 1m.

10. The method for treating organic waste by electric field enhancement according to claim 9, characterized in that: The composting treatment includes: the compost bag includes an organic solid waste container, the container includes a compost bag pressed or sewn by a nano composting film, the nano composting film includes a film body made of PTFE material, the nano composting film is composed of a polyester fiber layer resistant to ultraviolet oxidation, an expanded polytetrafluoroethylene semipermeable membrane material layer, and a polyester fiber material layer resistant to acid and alkali corrosion; the composting bag is also provided with at least one inner bag or outer bag; The cooling workshop also includes at least: an electric field covering the organic solid waste container, the electric field being generated by electrodes; An outer cover, wherein the outer cover is made of the nano composting film.

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