Preparation method of carbon source for acidic industrial wastewater treatment

Abstract

The invention discloses a preparation method of a carbon source for acidic industrial wastewater treatment, which comprises the following steps: mixing 40% of sodium acetate, 40% of liquid caustic soda reactant, 55-70% of lanthanum-loaded magnetic hydrothermal biochar adsorbent and 90% of purified water for use, and mixing the sodium acetate, the liquid caustic soda reactant, the lanthanum-loaded magnetic hydrothermal biochar adsorbent and the purified water to obtain a liquid carbon source; the lanthanum-loaded magnetic hydrothermal biochar adsorbent can increase the specific surface area of biochar, sodium acetate and caustic soda liquid reactants can turn a carbon source into alkalinity, so that acidic wastewater can be neutralized, the alkaline carbon source can facilitate nitration reaction of nitrifying bacteria, the pH value in the wastewater is increased, and the lanthanum-loaded magnetic hydrothermal biochar adsorbent is low in price, easy to operate and convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of industrial wastewater treatment, and in particular to a method for preparing a carbon source for treating acidic industrial wastewater. Background Art

[0002] Industrial acidic wastewater mainly comes from metallurgy, metal processing, petrochemical, chemical fiber, electroplating papermaking, leather making, oil refining, petrochemical, chemical fiber and other industries. Acidic and alkaline wastewater entering the water body will destroy the natural neutralization effect, change the pH value of the water body, affect the normal growth of aquatic organisms, and reduce the self-purification function of the water body. Acidic and alkaline wastewater infiltrates into the soil, which will destroy the physical and chemical properties of the soil, cause soil acidification or alkalization, and affect the normal growth of crops. Acidification of water bodies can also cause damage to ships, bridges and other water buildings. In the prior art, the treatment methods for industrial acidic wastewater include sulfate-reducing bacteria method, activated carbon adsorption method and coagulation precipitation method, catalytic oxidation method and wet oxidation method, lime neutralization precipitation treatment method, etc. However, some of these methods have disadvantages such as too large dosage, high price, or unsatisfactory treatment effect. Summary of the invention

[0003] The present invention provides a method for preparing a carbon source for treating acidic industrial wastewater, so as to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a method for preparing a carbon source for treating acidic industrial wastewater, the specific steps of the method are as follows: 40% sodium acetate and 40% liquid alkali reactants, 55-70% lanthanum-loaded magnetic hydrothermal biochar adsorbent, and 90% pure water.

[0005] The present invention is further configured as follows: the preparation method of the lanthanum-loaded magnetic hydrothermal biochar adsorbent is as follows: water is used as a solvent and rapeseed stems are used as a carbon source. The rapeseed stems are washed after high-temperature reaction and dried at 105°C. The dried sample is ground, sieved, washed, and placed in an oven at 80°C to obtain hydrothermal biochar HTC. FeCl3·6H2O, Fe2Cl2·4H2O, and LaCl3·7H2O are added to water, and after fully dissolving, the hydrothermal biochar HTC is added. An alkaline precipitant is added to a pH of 12, stirred, heated and matured, and transferred to a reactor. After the reaction, it is cooled, washed, and dried to obtain the lanthanum-loaded magnetic hydrothermal biochar adsorbent.

[0006] The present invention is further configured as follows: FeCl3·6H2O, Fe2Cl2·4H2O, and LaCl3·7H2O are added to water, and hydrothermal biochar is added at HTC after being fully dissolved, and an alkaline precipitant is added until the pH is 12, stirred, heated and matured, and transferred to a reactor. After the reaction, the lanthanum-loaded magnetic hydrothermal biochar adsorbent is obtained by cooling, washing, and drying. The alkaline precipitant is selected from ammonia water, sodium hydroxide or potassium hydroxide, the stirring time is 2 to 3 hours, the maturation time is 1.5 to 2.5 hours, and the maturation temperature is 85°C.

[0007] The present invention is further configured as follows: the mass-to-volume ratio of the rape stem to water is 1.1:5-6, the mass-to-volume ratio of the rape stem to water is 1.1:5-6, the rape stem is washed, dried and ground rape stem, the molar ratio of FeCl3·6H2O, FeCl2·4H2O and LaCl3·7H2O is 2:1:0-6, and the added amount of hydrothermal biochar HTC is 0.25g~0.5g.

[0008] The present invention is further configured that the chemical formula of the reactants of 40% sodium acetate and 40% liquid caustic soda is: CH3COONa+NaOH==CaO (heating)==CH4+Na2CO3.

[0009] The present invention is further configured that the magnesium salt in the magnesium salt aqueous solution includes magnesium chloride, magnesium nitrate, magnesium sulfide or magnesium sulfate; the chemical formula principle of the reactants is that at high temperature, the bond between the methyl group and the carboxyl group of sodium acetate is broken, the hydrogen-oxygen bond of sodium hydroxide is broken, hydrogen and oxygen are separated, and then the methyl group and hydrogen are combined into methane, and the rest are combined into sodium carbonate, and the sodium carbonate is retained after the methane is extracted.

[0010] The present invention is further configured to mix 40% sodium acetate and 40% liquid alkali reactants, a lanthanum-loaded magnetic hydrothermal biochar adsorbent and pure water to obtain a composite material for treating acidic industrial wastewater.

[0011] The beneficial effects of the present invention are as follows: The invention discloses a method for preparing a carbon source for treating acidic industrial wastewater. The method comprises the following steps: mixing sodium acetate with a liquid alkali reactant, a lanthanum-loaded magnetic hydrothermal biochar adsorbent and pure water to obtain a liquid carbon source. The lanthanum-loaded magnetic hydrothermal biochar adsorbent can increase the specific surface area of ​​the biochar. Meanwhile, the sodium acetate and the liquid alkali reactant can convert the carbon source into alkaline, thereby facilitating the neutralization of the acidic wastewater. The alkaline carbon source can facilitate nitrifying bacteria to carry out nitrification reaction and improve the pH value in the wastewater. The method has the advantages of low price, simple operation and convenient use. DETAILED DESCRIPTION

[0013] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0015] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through an intermediate structure, but are only connected to form a whole through a connecting structure. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0016] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0017] The present invention provides a technical solution: The reactants of sodium acetate and liquid alkali are 120 g of sodium acetate and 120 mL of liquid alkali, which are then heated and stirred to obtain methane and sodium carbonate, and the methane is extracted to retain the sodium carbonate.

[0018] The rapeseed stalks were dried at a reaction temperature of 220°C~240°C and a pressure of 4.5MP, then ground and sieved through 100 mesh. 50g of the obtained biochar powder was added to a 500g mixture of FeCl3·6H2O, FeCl2·4H2O, and LaCl3·7H2O and an alkaline precipitant until the pH value was 12. Finally, all of them were put into a reactor, heated to 180°C for reaction for 6h, and dried in a vacuum oven at 80°C for 4h to obtain a lanthanum-loaded magnetic hydrothermal biochar adsorbent.

[0019] The sodium acetate is mixed with the liquid alkali reactant, the lanthanum-loaded magnetic hydrothermal biochar adsorbent and pure water, and the mixing ratio is: 0.5g of sodium acetate and the liquid alkali reactant + 0.9g of the lanthanum-loaded magnetic hydrothermal biochar adsorbent + 1.2g of pure water.

[0020] It should be understood by those skilled in the art that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application, for example, the size, scale, structure, shape and proportion of various elements, and parameter values ​​such as temperature, pressure, etc., mounting arrangements, use of materials, color, changes in orientation, etc. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of an element may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structures described herein that perform the functions, and not only structural equivalence but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a particular embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0021] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0022] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0023] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for preparing a carbon source for treating acidic industrial wastewater, characterized in that The specific steps of the method are as follows: 40% sodium acetate and 40% liquid alkali reactants, 55-70% lanthanum-loaded magnetic hydrothermal biochar adsorbent, and 90% pure water.

2. The method for preparing a carbon source for treating acidic industrial wastewater according to claim 1, characterized in that: The preparation method of the lanthanum-loaded magnetic hydrothermal biochar adsorbent is as follows: water is used as a solvent and rapeseed stems are used as a carbon source. The rapeseed stems are washed after high-temperature reaction and dried at 105°C. The dried sample is ground, sieved, washed, and placed in an oven at 80°C for drying to obtain hydrothermal biochar HTC. FeCl3·6H2O, Fe2Cl2·4H2O, and LaCl3·7H2O are added to water, and after fully dissolving, the hydrothermal biochar HTC is added. An alkaline precipitant is added until the pH is 12, the mixture is stirred, heated and matured, and the mixture is transferred to a reactor. After the reaction, the mixture is cooled, washed, and dried to obtain the lanthanum-loaded magnetic hydrothermal biochar adsorbent.

3. A method for preparing a carbon source for treating acidic industrial wastewater according to claim 2, characterized in that: FeCl3·6H2O, Fe2Cl2·4H2O, and LaCl3·7H2O are added to water, and after they are fully dissolved, hydrothermal biochar is added at HTC, and an alkaline precipitant is added until the pH is 12, stirred, heated and matured, and transferred to a reactor. After the reaction, it is cooled, washed, and dried to obtain a lanthanum-loaded magnetic hydrothermal biochar adsorbent. The alkaline precipitant is selected from ammonia water, sodium hydroxide or potassium hydroxide. The stirring time is 2 to 3 hours, the maturation time is 1.5 to 2.5 hours, and the maturation temperature is 85°C.

4. The method for preparing a carbon source for treating acidic industrial wastewater according to claim 2, characterized in that: The mass volume ratio of the rape stem to water is 1.1:5-6, the rape stem is washed, dried and ground, the molar ratio of FeCl3·6H2O, FeCl2·4H2O and LaCl3·7H2O is 2:1:0-6, and the added amount of hydrothermal biochar HTC is 0.25g~0.5g.

5. The method for preparing a carbon source for treating acidic industrial wastewater according to claim 1, characterized in that: The chemical formula of the reactants of 40% sodium acetate and 40% liquid caustic soda is: CH3COONa+NaOH==CaO (heating)==CH4+Na2CO3.

6. A method for preparing a carbon source for treating acidic industrial wastewater according to claim 5, characterized in that: The principle of the chemical formula of the reactants is that at high temperature, the bond between the methyl and carboxyl groups of sodium acetate breaks, the hydrogen-oxygen bond of sodium hydroxide breaks, hydrogen and oxygen separate, and then the methyl and hydrogen combine to form methane, and the rest combine to form sodium carbonate. After the methane is extracted, the sodium carbonate is retained.

7. The method for preparing a carbon source for treating acidic industrial wastewater according to claim 1, characterized in that: The composite material for treating acidic industrial wastewater can be obtained by mixing 40% sodium acetate and 40% liquid alkali reactants, lanthanum-loaded magnetic hydrothermal biochar adsorbent and pure water.