Safe carbon source and preparation method thereof

Abstract

The preparation method comprises the following steps: respectively forming an upper-layer film and a lower-layer film by using a soluble gel material through a protective film forming mold, and injecting various components of a liquid carbon source into different parts of the lower-layer film in a one-to-one correspondence manner according to a proportion; the upper outer layer film covers the surface of the lower layer film and hermetically connects the upper layer film and the lower layer film at the periphery of each component liquid carbon source, so that each component of the liquid carbon source is hermetically coated in each hollow cavity formed between the upper layer film and the lower layer film; the liquid carbon source is prevented from volatilizing outwards in the storage and transportation processes to pollute the environment and reduce the COD (Chemical Oxygen Demand) of the carbon source, the liquid carbon source is ensured to have high equivalent weight in use, and is directly added in use or added after being prepared as a medicament, the use is convenient, and the soluble gel material is prepared from a solid carbon source and is environment-friendly. The sealing performance, the stability and the environmental protection performance of the carbon source are ensured, and the utilization rate of the carbon source is also improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a safe carbon source and a preparation method thereof. Background Art

[0002] At present, carbon sources are generally divided into: liquid carbon sources and solid carbon sources, among which:

[0003] Liquid carbon source: mainly composed of small molecules such as methanol and ethanol and biodegradable liquid raw materials using a single component or a combination of multiple components; this type of carbon source has a fast denitrification rate, C / N, and high adaptability; but there are transportation safety issues; currently, in order to ensure transportation safety, the COD equivalent of the carbon source provided is relatively low during transportation; and for high equivalents, the main stable raw materials: such as ethylene glycol, propylene glycol, etc., are too expensive, and the use of carbon sources is not worth the cost. Therefore, in view of the transportation radius and safety issues, current carbon source manufacturers generally use low COD carbon sources, which greatly limits the use of some high value-added raw materials; at the same time, there are also safety issues, odor problems, volatility, etc. in on-site use; therefore, when the market uses liquid carbon sources, most of them are harmful, and their volatility not only causes the loss of COD of the carbon source, but also has strict storage requirements;

[0004] Solid carbon sources: such as sodium acetate and glucose, are expensive and difficult to meet market demand; some solid carbon sources, such as polycaprolactone, have slow and uncontrollable carbon source utilization rates. Summary of the invention

[0005] In order to overcome the above defects, the present invention provides a safe carbon source and a preparation method thereof. The safe carbon source prepared by the preparation method of the safe carbon source has the advantages of high equivalent, safe storage and transportation, and convenient use.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a safe carbon source, including a plurality of protective films with hollow cavities made of soluble gel material and a liquid carbon source, wherein the liquid carbon source is sealed and coated in the hollow cavity of the protective film.

[0007] As a further improvement of the present invention, the soluble gel material is water-soluble modified polyvinyl alcohol (PVA), polycaprolactone (PCL) or other biodegradable solid carbon sources.

[0008] As a further improvement of the present invention, the protective film includes an upper film and a lower film, the edges of the upper film and the lower film are sealed and connected to form an integrated structure, and the liquid carbon source is contained in a hollow cavity formed between the upper film and the lower film.

[0009] As a further improvement of the present invention, calculated by mass percentage, the liquid carbon source includes 90%-95% of small molecule alcohol, 0.01%-0.1% of trace elements, 0.5%-1% of nitrogen and phosphorus elements, 1%-5% of growth factors and 1%-3% of alkalinity agent.

[0010] As a further improvement of the present invention, a plurality of hollow cavities are formed in the protective film, and each component of the liquid carbon source is sealed and coated in an independent hollow cavity.

[0011] As a further improvement of the present invention, after each hollow cavity in the protective film is filled with each component of the liquid carbon source one by one, a plurality of spherical structures are formed, wherein the protective film covers the small molecule alcohol part to form a first sphere 1, the protective film covers the trace element part to form a second sphere 2, the protective film covers the nitrogen and phosphorus element part to form a third sphere 3, the protective film covers the growth factor part to form a fourth sphere 4, and the protective film covers the alkalinity agent part to form a fifth sphere 5, and the second sphere 2, the third sphere 3, the fourth sphere 4 and the fifth sphere 5 are evenly distributed on the periphery of the first sphere 1.

[0012] As a further improvement of the present invention, the small molecule alcohol is methanol, ethanol or propylene glycol (it can be one of them or a combination of multiple ones); the trace elements include at least one trace element of iron, copper, zinc and selenium, and the various trace elements are mixed in any proportion; the nitrogen and phosphorus elements are nitrogen-containing compounds and phosphorus-containing compounds; the growth factor is protein (amino acid, etc.); and the alkalinity agent is sodium acid or sodium bicarbonate.

[0013] A method for preparing a safe carbon source comprises the following steps:

[0014] Step 1: preparing the upper membrane;

[0015] Step 2: prepare the lower membrane, and inject various components of the liquid carbon source into different parts of the lower membrane in a one-to-one correspondence according to the proportion;

[0016] Step 3: Cover the upper outer film on the surface of the lower film;

[0017] Step 4: The upper membrane and the lower membrane are sealed and connected at the periphery of each component liquid carbon source, so that each component carbon source is sealed and separated in different hollow cavities formed by the upper membrane and the lower membrane.

[0018] As a further improvement of the present invention, in the step one, a protective film molding mold is first designed and manufactured, and a protective film molding cavity is formed in the protective film molding mold, wherein the protective film molding cavity includes a large arc molding cavity located in the middle and a plurality of small arc molding cavities located outside the large arc molding cavity, and the edges of the arc molding cavities are connected to form an integrated structure, and the size of each arc molding cavity corresponds one-to-one to each component of the liquid carbon source, and the soluble gel material is injected into the protective film molding mold to form an upper film and a lower film; in the step two, the various components of the liquid carbon source are injected one-to-one into the arc-shaped pits of the lower film according to the design; in the step three, after the upper film is covered on the surface of the lower film, the arc-shaped pits of the upper film and the lower film are spliced ​​into a spherical structure; in the step four, the upper film and the lower film are sealed and connected at the edges of the arc-shaped pits.

[0019] As a further improvement of the present invention, the upper film and the lower film are sealed and connected by heat pressing or gluing to form an integrated structure.

[0020] The beneficial effects of the present invention are as follows: the present invention adopts a soluble gel material to make a protective film with a hollow cavity, and seals and covers a liquid carbon source in the hollow cavity of the protective film, so that the liquid carbon source cannot be released outwardly, and the liquid carbon source is prevented from volatilizing outwardly and polluting the environment and reducing the COD of the carbon source during storage and transportation, and ensures that the liquid carbon source has a high equivalent when used, is convenient for storage and transportation, and is also convenient for long-distance transportation. It does not need to be stored in a storage tank, and is directly added when used, or added after being prepared as a medicine, and does not need to prepare related mechanical equipment. It is easy to use and has a low use cost, so that the carbon source has a high cost performance. The soluble gel material of the present invention is made of PVA, PCL and a biodegradable solid carbon source, so that the carbon source not only ensures the sealing, stability and environmental protection of the product, but also improves the utilization rate of the carbon source. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the safe carbon source of the present invention;

[0022] Figure 2 It is a schematic diagram of the principle of the protective film forming cavity of the forming mold of the present invention. DETAILED DESCRIPTION

[0023] In order to make the advantages, technical solutions and innovations of the present invention clearer, the present invention will be further described in detail below in conjunction with the above drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present invention.

[0024] Embodiment: A safe carbon source, characterized in that it comprises a plurality of protective films with hollow cavities made of soluble gel material and a liquid carbon source, wherein the liquid carbon source is sealed and coated in the hollow cavity of the protective film.

[0025] The liquid carbon source is sealed and wrapped in a protective film, which serves as a structural support, thereby avoiding volatilization of the liquid carbon source, facilitating transportation, storage and use, avoiding pollution to the environment, and ensuring a high equivalent of the liquid carbon source. The protective film is made of soluble gel material with good biocompatibility and biochemical properties. When it is put into wastewater for use as a carbon source, the protective film can be quickly dissolved, and the liquid carbon source is automatically released into the wastewater after the protective film is dissolved, and a rapid denitrification reaction can be carried out.

[0026] The soluble gel material is water-soluble modified polyvinyl alcohol (PVA), polycaprolactone (PCL) or other biodegradable solid carbon sources. The solid carbon source material is used as a protective film, which has good biocompatibility and biodegradability. When it is dissolved in wastewater, it can also be used as a carbon source for denitrification reaction.

[0027] The protective film includes an upper film and a lower film, the edges of which are sealed and connected to form an integrated structure, and the liquid carbon source is contained in a hollow cavity formed between the upper film and the lower film. The protective film is sealed and connected by the upper film and the lower film, which facilitates the injection and encapsulation of the liquid carbon source. In addition, the protective film can also be directly injection molded into a cavity structure with an injection hole, and after the liquid carbon source is injected, the injection hole can be sealed. This is an equivalent replacement solution that can be easily thought of by those skilled in the art based on this application, and it also belongs to the protection scope of this application.

[0028] Calculated by mass percentage, the liquid carbon source includes 90%-95% of small molecule alcohol, 0.01%-0.1% of trace elements, 0.5%-1% of nitrogen and phosphorus elements, 1%-5% of growth factors and 1%-3% of alkalinity agent. The liquid carbon source can also choose other formulas, which can be selected according to needs.

[0029] A plurality of hollow cavities are formed in the protective film, and each component of the liquid carbon source is sealed and coated in an independent hollow cavity.

[0030] After each component of the liquid carbon source is filled in each hollow cavity in the protective film, multiple spherical structures are formed, wherein the protective film covers the small molecule alcohol part to form the first sphere, the protective film covers the trace element part to form the second sphere, the protective film covers the nitrogen and phosphorus element part to form the third sphere, the protective film covers the growth factor part to form the fourth sphere, and the protective film covers the alkalinity agent part to form the fifth sphere. The second sphere, the third sphere, the fourth sphere and the fifth sphere are evenly spaced and distributed around the first sphere. Multiple small spheres are surrounded by a large sphere to form a petal-like structure (the number of petals is designed according to the formula requirements. After each hollow cavity is coated with the liquid carbon source, it can also be in other shapes, such as flat, thick in the middle and thin at the edge, rugby, etc.

[0031] The small molecule alcohol is methanol, ethanol or propylene glycol (it can be one of them or a combination of multiple); the trace elements include at least one of iron, copper, zinc and selenium, and various trace elements are mixed in any proportion; the nitrogen and phosphorus elements are nitrogen-containing compounds and phosphorus-containing compounds; the growth factor is protein (amino acid, etc.); the alkalinity agent is sodium acid or sodium bicarbonate.

[0032] A method for preparing a safe carbon source comprises the following steps:

[0033] Step 1: designing and manufacturing a protective film forming mold, forming a protective film forming cavity in the protective film forming mold, wherein the protective film forming cavity includes a large arc forming cavity located in the middle and a plurality of small arc forming cavities located outside the large arc forming cavity, wherein the edges of the arc forming cavities are connected to form an integrated structure, and the size of each arc forming cavity corresponds to each component of the liquid carbon source one by one;

[0034] Step 2: injecting the soluble gel material into the protective film forming mold to form an upper film and a lower film;

[0035] Step 3: Inject various components of the liquid carbon source into the arc-shaped pits of the lower membrane one by one according to the design;

[0036] Step 4: Cover the upper outer layer membrane on the surface of the lower layer membrane, and the arc-shaped pits of the upper layer membrane and the lower layer membrane are spliced ​​into a spherical structure;

[0037] Step 5: The upper membrane and the lower membrane are sealed and connected at the edges of the arc-shaped pits on the periphery of each component liquid carbon source. The upper membrane and the lower membrane are sealed and connected by hot pressing or gluing to form an integrated structure, so that each component carbon source is sealed and separated in different hollow cavities formed by the upper membrane and the lower membrane.

[0038] After the upper film and the lower film are molded by the protective film molding mold of the above structure, a plurality of semicircular pits are formed on the lower film in the protective film molding cavity, which facilitates the injection of the various components of the liquid carbon source into the various semicircular pits. After injection, the various components of the liquid carbon source will not mix together. After covering the upper film, the upper film and the lower film are sealed at the edges of the various semicircular pits, thereby forming a plurality of sealed cavities for sealing the various components of the liquid carbon source.

Claims

1. A safe carbon source, characterized in that: The invention comprises a plurality of protective films with hollow cavities made of soluble gel material and a liquid carbon source, wherein the liquid carbon source is sealed and coated in the hollow cavities of the protective films.

2. The safe carbon source according to claim 1, characterized in that: The soluble gel material is water-soluble modified polyvinyl alcohol (PVA), polycaprolactone (PCL) or other biodegradable solid carbon sources.

3. The safe carbon source according to claim 1 or 2, characterized in that: The protective film comprises an upper film and a lower film, the edges of the upper film and the lower film are sealed and connected to form an integrated structure, and the liquid carbon source is contained in a hollow cavity formed between the upper film and the lower film.

4. The safe carbon source according to claim 1, characterized in that: Calculated by mass percentage, the liquid carbon source includes 90%-95% of small molecule alcohol, 0.01%-0.1% of trace elements, 0.5%-1% of nitrogen and phosphorus elements, 1%-5% of growth factors and 1%-3% of alkalinity agent.

5. The safe carbon source according to claim 4, characterized in that: A plurality of hollow cavities are formed in the protective film, and each component of the liquid carbon source is sealed and coated in an independent hollow cavity.

6. The safe carbon source according to claim 5, characterized in that: After each component of the liquid carbon source is filled in each hollow cavity in the protective film one by one, a plurality of spherical structures are formed, wherein the protective film covers the small molecule alcohol part to form a first sphere (1), the protective film covers the trace element part to form a second sphere (2), the protective film covers the nitrogen and phosphorus element part to form a third sphere (3), the protective film covers the growth factor part to form a fourth sphere (4), and the protective film covers the alkalinity agent part to form a fifth sphere (5), and the second sphere (2), the third sphere (3), the fourth sphere (4) and the fifth sphere (5) are evenly distributed around the first sphere (1).

7. The safe carbon source according to claim 4, characterized in that: The small molecule alcohol is methanol, ethanol or glycerol; the trace elements include at least one of iron, copper, zinc and selenium, and various trace elements are mixed in any proportion; the nitrogen and phosphorus elements are nitrogen-containing compounds and phosphorus-containing compounds; the growth factor is protein; and the alkalinity agent is sodium acid or sodium bicarbonate.

8. A method for preparing the safe carbon source according to claims 1-7, characterized in that: The steps include: Step 1: preparing the upper membrane; Step 2: prepare the lower membrane, and inject various components of the liquid carbon source into different parts of the lower membrane in a one-to-one correspondence according to the proportion; Step 3: Cover the upper outer film on the surface of the lower film; Step 4: The upper membrane and the lower membrane are sealed and connected at the periphery of each component liquid carbon source, so that each component carbon source is sealed and separated in different hollow cavities formed by the upper membrane and the lower membrane.

9. The method for preparing a safe carbon source according to claim 8, characterized in that: In the step one, a protective film forming mold is first designed and manufactured, and a protective film forming cavity is formed in the protective film forming mold, wherein the protective film forming cavity comprises a large arc forming cavity in the middle and a plurality of small arc forming cavities located at the periphery of the large arc forming cavity, and the edges of the arc forming cavities are connected to form an integrated structure, and the size of each arc forming cavity corresponds to each component of the liquid carbon source one by one, and a soluble gel material is injected into the protective film forming mold to form an upper film and a lower film; in the step two, various components of the liquid carbon source are injected into each arc-shaped pit of the lower film one by one according to the design; in the step three, after the upper film is covered on the surface of the lower film, the arc-shaped pits of the upper film and the lower film are spliced ​​into a spherical structure; in the step four, the upper film and the lower film are sealed and connected at the edge of each arc-shaped pit.

10. The method for preparing a safe carbon source according to claim 8 or 9, characterized in that: The upper film and the lower film are sealed and connected by heat pressing or gluing to form an integrated structure.

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