TWI714438B - Carboxymethyl cellulose emulsified carbon-releasing substrate and soil treatment method - Google Patents

Abstract

A carboxymethyl cellulose emulsified carbon-releasing substrate and a soil treatment method are described. The carboxymethyl cellulose emulsified carbon-releasing substrate includes 450 to 550 parts by weight of vegetable oil; 75 to 95 parts by weight of lecithin; 55 to 75 parts by weight of a surfactant; 5 to 15 parts by weight of a vitamin; 15 to 20 parts by weight of carboxymethyl cellulose; 400 to 600 parts by weight of water.

Description

Carboxymethyl cellulose emulsified carbon releasing substrate and soil remediation method

The invention relates to a carbon releasing substrate and a soil remediation method, in particular to a carboxymethyl cellulose emulsified carbon releasing substrate and a soil remediation method.

Chlorine-containing organic solvents are often widely used in industrial processes such as degreasing, electronic parts cleaning and dry cleaning. Often due to improper management and disposal by humans, the leakage of chlorinated organic solvents has become a common heavy non-aqueous solution in groundwater (dense non-aqueous phase liquids, DNAPL) pollutants, because the density of heavy non-aqueous phase liquids is heavier than water and is insoluble or only slightly soluble in water, so heavy non-aqueous phase liquids will form a Independent liquid phase, and trichloroethylene (TCE) is the most representative chlorine-containing organic solvent at home and abroad. Once a trichloroethylene leak occurs, it may be exposed to the environment through various channels such as drinking water, causing serious harm to the health of neighboring people.

In order to solve the above-mentioned pollution problems, many studies have focused on trichloroethylene as the target pollutant to research and develop remediation technologies that can treat DNAPL contaminated groundwater. For example, the use of chemical reduction methods, nanotechnology and microbial applications in bioremediation to degrade chlorinated organic pollutants in the environment has been researched and applied for decades. Among them, the bioremediation program of green remediation belongs to Environmentally friendly and rapid technology, its application in the on-site degradation of environmental pollutants is mainly to provide biodegradable organic matrix composition to the on-site microorganisms to assist the microorganisms in decomposing the pollutants, so it can be compared with physical and chemical treatment methods. Relatively lower remediation costs, easy to operate and easier to be accepted by the general public. At the same time, the degradation process of the biological restoration process is less likely to change the types of pollutants such as chemical precipitation and produce a large amount of harmful sludge that will cause secondary damage to the environment.

However, the existing biological remediation methods are not targeted at contaminated sites with a faster groundwater flow rate, and therefore cannot continue to produce remediation effects. Therefore, it is necessary to provide a carboxymethyl cellulose emulsified carbon release matrix and a soil remediation method to solve the problems of the conventional technology.

One objective of the present invention is to provide a carboxymethyl cellulose emulsified carbon-releasing matrix and a soil remediation method, which uses a specific food additive (carboxymethyl cellulose (carboxymethyl cellulose, CMC)) to make carboxymethyl cellulose The carboxymethyl cellulose emulsified carbon-releasing substrate (CMC-ECS) can be quickly adsorbed between the sand particles and pores around the injection well and is not easy to disappear with the flow of water. The carboxymethyl cellulose emulsified carbon-releasing substrate has Good diffusion characteristics, can effectively diffuse the drug to the pollution remediation area, and can be used to adsorb the non-aqueous phase (NAPL) organic pollutants of the groundwater pollution site, and can assist the local bacteria in Taiwan to degrade the common organic pollutants in the soil and groundwater. At the same time, it can improve the problem of matrix lapse caused by the treatment period, the problem of medicament consumption and the advantage of reducing the cost of manpower management.

In order to achieve the above objective, the present invention provides a carboxymethyl cellulose emulsified carbon releasing matrix, comprising: 450 to 550 parts by weight of vegetable oil; 75 to 95 parts by weight of lecithin; 55 to 75 parts by weight of surfactant; 5 to 15 parts by weight of vitamins; 15 to 20 parts by weight of carboxymethyl cellulose; and 400 to 600 parts by weight of water.

In an embodiment of the present invention, the vegetable oil includes at least one of soybean oil, corn oil, cottonseed oil, rapeseed oil, peanut oil, sunflower oil, palm oil, and linseed oil.

In an embodiment of the present invention, the carboxymethyl cellulose emulsified carbon release matrix further contains 10 to 30 parts by weight of sodium lactate.

In an embodiment of the present invention, the carboxymethyl cellulose emulsified carbon release matrix further contains 3 to 5 parts by weight of food-grade polymerized carbohydrates.

In an embodiment of the present invention, the carboxymethyl cellulose emulsified carbon-releasing matrix further contains more than 0 and less than 5 parts by weight of modified nano-zero-valent iron.

In an embodiment of the present invention, the modified zero-valent iron nanometer is modified by ethanol and lecithin.

In order to achieve the above objective, the present invention provides a soil remediation method, comprising the steps of: providing the carboxymethyl cellulose emulsified carbon-releasing matrix of any of the embodiments described above; and injecting the carboxymethyl cellulose emulsified carbon-releasing matrix Substrate into the soil to be renovated.

In an embodiment of the present invention, the step of providing the carboxymethyl cellulose emulsified carbon releasing matrix The steps include: mixing 450 to 550 parts by weight of vegetable oil, 75 to 95 parts by weight of lecithin, 55 to 75 parts by weight of surfactant and 5 to 15 parts by weight of vitamins to form a mixture; mixing 15 to 20 parts by weight Carboxymethyl cellulose and 400 to 600 parts by weight of water to form a mixed solution; add the mixture to the mixed solution to form a pre-treatment solution; and the pre-treatment solution at 33 to 37°C A uniform mixing step is performed to form the carboxymethyl cellulose emulsified carbon release matrix.

In an embodiment of the present invention, the step of forming the mixture includes uniformly mixing the mixture through a homogenizer at a rotation speed of 8000 to 9000 RPM.

In an embodiment of the present invention, the step of forming the mixed liquid includes uniformly mixing the mixed liquid at a rotation speed of 10,000 to 15,000 RPM through a homogenizer.

10: method

11~12: steps

Figure 1 is a schematic flow diagram of a soil remediation method according to an embodiment of the present invention.

Figure 2 is a graph showing the analysis results of Example 1 and Comparative Example 1.

In order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following will specifically cite the preferred embodiments of the present invention, together with the accompanying drawings, and describe in detail as follows. Furthermore, the directional terms mentioned in the present invention, such as up, down, top, bottom, front, back, left, right, inside, outside, side, surrounding, center, horizontal, horizontal, vertical, vertical, axial, The radial direction, the uppermost layer or the lowermost layer, etc., are only the direction of reference to the attached drawings. Therefore, the directional terms used are used to describe and understand the present invention, rather than to limit the present invention.

The carboxymethyl cellulose emulsified carbon releasing matrix of an embodiment of the present invention comprises: 450 to 550 parts by weight of vegetable oil; 75 to 95 parts by weight of lecithin; 55 to 75 parts by weight of surfactant; 5 to 15 parts by weight Parts of vitamins; 15 to 20 parts by weight of carboxymethyl cellulose; and 400 to 600 parts by weight of water. In one embodiment, the vegetable oil includes at least one of soybean oil, corn oil, cottonseed oil, rapeseed oil, peanut oil, sunflower oil, palm oil, and linseed oil. In one example, the vegetable oil is soybean oil. In another embodiment, the vegetable oil may be 460, 470, 480, 490, 500, 510, 520, 530, or 540 parts by weight, for example. The vegetable oil is mainly used as a biological carbon source.

In one embodiment, the lecithin may include soy lecithin. In another embodiment, Lecithin may be 80, 85 or 90 parts by weight, for example. Lecithin can be used as a surfactant.

In one embodiment, the surfactant is mainly used as an emulsified oil product. In one example, the surfactant is, for example, a commercially available surfactant (for example, a SIMPLE GREEN brand of surfactant produced by SUNSHINE MAKERS). In another embodiment, the surfactant may be 60, 65, or 70 parts by weight, for example.

In one embodiment, vitamins can be used as micronutrients to provide microorganisms in the soil to be rehabilitated. In another embodiment, the vitamin may be 6, 7, 8, 9, 10, 11, 12, 13, or 14 parts by weight, for example.

In an embodiment, the carboxymethyl cellulose may be 16, 17, 18, or 19 parts by weight, for example. What I want to mention here is that the presence of carboxymethyl cellulose can make the carboxymethyl cellulose emulsified carbon release matrix of the embodiment of the present invention have latex-like high polymerization characteristics, and CMC-ECS has good diffusion characteristics. It can effectively diffuse the drug to the pollution remediation area and is used to adsorb the non-aqueous phase (NAPL) organic pollutants of the groundwater pollution site (such as: chloroform, tetrachloroethylene, trichloroethylene, trichloroethane and methylene chloride, etc.) The groundwater pollutants in the industrial zone), and can assist Taiwan's local bacteria to degrade the organic pollutants. At the same time, it can alleviate the problem of matrix lapse caused by the remediation period, the problem of chemical consumption and the advantage of reducing the cost of manpower management.

In one embodiment, water is mainly used as a solvent to make the carboxymethyl cellulose emulsified carbon releasing matrix form a solution state. In another embodiment, the water may be 420, 440, 460, 480, 500, 520, 540, 560, or 580 parts by weight, for example.

In one embodiment, the carboxymethyl cellulose emulsified carbon releasing matrix further contains 10 to 30 parts by weight of sodium lactate. Sodium lactate can be used as an auxiliary biological carbon source to provide microorganisms in the soil to be rehabilitated. In another embodiment, the sodium lactate may be 12, 14, 16, 18, 20, 22, 24, 26 or 28 parts by weight, for example.

In one embodiment, the carboxymethyl cellulose emulsified carbon release matrix further contains 3 to 5 parts by weight of food-grade polymerized carbohydrates (which are, for example, additives used for food thickening). In an example, the food-grade polymerized carbohydrate may be 3.5, 4, or 4.5 parts by weight, for example. The food-grade polymerized carbohydrates can be used to stabilize vegetable oils (and/or macromolecular polymers). The food-grade polymerized carbohydrate includes at least one of corn starch and sweet potato powder, for example.

In one embodiment, the carboxymethyl cellulose emulsified carbon-releasing matrix further contains more than 0 and less than 5 parts by weight of modified nano-zero-valent iron. In one example, the modified zero-valent iron is modified by adding ethanol and lecithin to zero-valent iron. For example, based on the total weight of the modified zero-valent iron nanoparticles being 100% by weight, the zero-valent iron nanoparticles are 8-10% by weight, the ethanol series are 80-90% by weight, and the lecithin series are 4-10% by weight. The effect of modifying nano-zero-valent iron is to provide a low reduction potential (for example, it can provide a potential between -150 to -300 mV).

It should be mentioned that the carboxymethyl cellulose emulsified carbon release matrix of the embodiment of the present invention is at least by adding a specific substance (such as carboxymethyl cellulose), wherein the specific substance and other substances (including vegetable oil, lecithin, Vitamins, surfactants and water) together form a carboxymethyl cellulose emulsified carbon-releasing matrix. The carboxymethyl cellulose emulsified carbon-releasing matrix has latex-like high polymerization characteristics and good diffusion characteristics, which can effectively The drug diffuses to the pollution remediation area and is used to adsorb the non-aqueous phase (NAPL) organic pollutants of the groundwater pollution site (for example: chloroform, perchloroethylene, trichloroethylene, trichloroethane, methylene chloride and other common industrial areas) Groundwater pollutants), and can assist Taiwan's local bacteria to degrade the organic pollutants. At the same time, it can alleviate the problem of matrix loss, chemical consumption and reduce the cost of manpower management during the remediation period.

In addition, it should be mentioned that the carboxymethyl cellulose emulsified carbon releasing matrix of the embodiment of the present invention is at least by using a specific composition of a specific ratio to form a carboxymethyl cellulose emulsified carbon releasing matrix, wherein The methylcellulose emulsified carbon release matrix has latex-like high polymerization characteristics and good diffusion characteristics, which can effectively diffuse the drug to the pollution remediation area and is used to adsorb the non-aqueous phase (NAPL) organic pollutants of the groundwater pollution site ( For example: chloroform, tetrachloroethylene, trichloroethylene, trichloroethane, methylene chloride and other common groundwater pollutants in industrial areas), and can assist Taiwan's in-situ bacteria to degrade the organic pollutants, while improving the remediation period The resulting matrix elapsed problem, medicament consumption problem and the advantage of reducing manpower management costs.

Please refer to Figure 1, a soil remediation method 10 of an embodiment of the present invention mainly includes the following steps 11 to 12: providing a carboxymethyl cellulose emulsified carbon release matrix of any embodiment of the present invention (step 11); and injecting The carboxymethyl cellulose emulsified carbon releasing matrix is put into a soil to be renovated (step 12).

In one embodiment, the step of providing the carboxymethyl cellulose emulsified carbon releasing matrix comprises: mixing 450 to 550 parts by weight of vegetable oil, 75 to 95 parts by weight of lecithin, and 55 to 75 parts by weight of Surfactant and 5 to 15 parts by weight of vitamins to form a mixture; mix 15 to 20 parts by weight of carboxymethyl cellulose and 400 to 600 parts by weight of water to form a mixture; add the mixture to the mixture In the liquid, a pre-treatment liquid is formed; and the pre-treatment liquid is uniformly mixed at a temperature between 33 and 37° C. to form the carboxymethyl cellulose emulsified carbon releasing matrix. In one embodiment, the step of forming the mixture includes uniformly mixing the mixture through a homogenizer at a rotation speed of 8000 to 9000 RPM. In another embodiment, the step of forming the mixed liquid includes uniformly mixing the mixed liquid at a rotation speed of 10,000 to 15,000 RPM through a homogenizer.

It is worth mentioning that the uniform mixing step needs to be carried out at 33 to 37°C throughout the entire process to achieve the effect of uniform mixing to form a carboxymethyl cellulose emulsified carbon release matrix. If it is less than 33°C or greater than 37°C, the effect of uniform mixing to form a carboxymethyl cellulose emulsified carbon releasing matrix cannot be achieved.

An example and a comparative example are given below to illustrate that the carboxymethyl cellulose emulsified carbon-releasing matrix of the embodiment of the present invention can indeed stay in the soil pores of the target polluted area.

Example 1

First, provide 450 to 550 parts by weight of vegetable oil, 75 to 95 parts by weight of lecithin (such as soybean lecithin), and 55 to 75 parts by weight of surfactant (such as the SIMPLE GREEN brand surfactant produced by SUNSHINE MAKERS) And 5 to 15 parts by weight of vitamins. Then, the above-mentioned substances are uniformly mixed at a rotation speed of 8000 to 9000 RPM (for example, 8800 RPM) through a homogenizing device to form a mixture.

In addition, 15 to 20 parts by weight of carboxymethyl cellulose and 400 to 600 parts by weight of water are provided. Then, the above-mentioned substances are uniformly mixed at a rotation speed of 10,000 to 15,000 RPM (for example, 12,000 RPM) through a homogenizing device to form a mixed liquid.

Afterwards, the mixture is added to the mixed liquid to form a pretreatment liquid. A uniform mixing step is performed on the pretreatment liquid (for example, the pretreatment liquid is uniformly mixed at a rotation speed of 500 to 600 RPM) to form the carboxymethyl cellulose emulsified carbon release matrix of Example 1.

Comparative example 1

The preparation method of Comparative Example 1 is roughly similar to that of Example 1, except that Comparative Example 1 does not include the steps of forming a mixed solution, pretreatment solution, and performing uniform mixing.

After that, the substrates of Example 1 and Comparative Example 1 were respectively injected into a soil to be renovated, and the relationship between the degree of replacement of water and the release of total organic carbon was measured by a commercially available instrument. The obtained analysis results are shown in Figure 2, where C ₀ refers to the initial total organic carbon concentration, and C refers to the total organic carbon concentration after replacing various pore volumes, ECS refers to Comparative Example 1, and CMC refers to This is Example 1. It can be seen from Figure 2 that the pore volume (PV) measured from 6 to 10 shows that the agent added in Example 1 has the characteristics of being able to adsorb in the pores so that the agent stays longer and releases slowly. It is suitable for applications in highly water-permeable pollution fields. site.

Although the present invention has been disclosed in preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to the scope of the attached patent application.

10: method

11~12: steps

Claims (10)

A carboxymethyl cellulose emulsified carbon release matrix, which contains: 450 to 550 parts by weight of vegetable oil; 75 to 95 parts by weight of lecithin; 55 to 75 parts by weight of surfactant; 5 to 15 parts by weight of vitamins; 15 to 20 parts by weight of carboxymethyl cellulose; and 400 to 600 parts by weight of water. The carboxymethylcellulose emulsified carbon-releasing matrix according to claim 1, wherein the vegetable oil comprises at least one of soybean oil, corn oil, cottonseed oil, rapeseed oil, peanut oil, sunflower oil, palm oil, and linseed oil One kind. The carboxymethyl cellulose emulsified carbon release matrix according to claim 1, wherein the carboxymethyl cellulose emulsified carbon release matrix further contains 10 to 30 parts by weight of sodium lactate. The carboxymethyl cellulose emulsified carbon release matrix according to claim 1, wherein the carboxymethyl cellulose emulsified carbon release matrix further contains 3 to 5 parts by weight of food-grade polymerized carbohydrates. The carboxymethyl cellulose emulsified carbon-releasing matrix according to claim 1, wherein the carboxymethyl cellulose emulsified carbon-releasing matrix further contains more than 0 and less than 5 parts by weight of modified nano-zero-valent iron. The carboxymethylcellulose emulsified carbon release matrix according to claim 5, wherein the modified zero-valent iron nanometer is modified by ethanol and lecithin. A soil remediation method, including steps: Provide the carboxymethyl cellulose emulsified carbon releasing matrix according to any one of claims 1 to 6; and Inject the carboxymethyl cellulose emulsified carbon releasing matrix into a soil to be renovated. The soil remediation method according to claim 7, wherein the step of providing the carboxymethyl cellulose emulsified carbon release matrix comprises: Mix 450 to 550 parts by weight of vegetable oil, 75 to 95 parts by weight of lecithin, 55 to 75 parts by weight of surfactant, and 5 to 15 parts by weight of vitamins to form a mixture; Mix 15 to 20 parts by weight of carboxymethyl cellulose and 400 to 600 parts by weight of water to form a mixed solution; Adding the mixture to the mixed solution to form a pretreatment solution; and A uniform mixing step is performed on the pretreatment liquid at 33 to 37° C. to form the carboxymethyl cellulose emulsified carbon releasing matrix. The soil remediation method according to claim 8, wherein the step of forming the mixture includes uniformly mixing the mixture through a homogenizer at a rotation speed of 8000 to 9000 RPM. The soil improvement method according to claim 8, wherein the step of forming the mixed liquid includes uniformly mixing the mixed liquid at a rotation speed of 10000 to 15000 RPM through a homogenizer.

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