A confined electro-oxidized biochar and a preparation method thereof

Abstract

The application relates to the technical field of water purification, and particularly discloses a confined electric oxidation biochar and a preparation method thereof.A kind of confined electric oxidation biochar, the raw material of the confined electric oxidation biochar includes aggregate, powder, glue, and the weight ratio of the aggregate to the powder is (95:5)-(99:1). When the weight ratio of the aggregate to the powder is (95:5)-(99:1) in the application, the powder is adhered to the aggregate by using the glue, so that the powder is uniformly loaded on the surface of the aggregate, and the confined electric oxidation biochar is prepared. Therefore, when the confined electric oxidation biochar is used for water treatment, the powder will not move with the flow of the water body, and the treatment effect of the water body is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification, and in particular to a confined electric oxidation biochar and a preparation method thereof. BACKGROUND

[0002] With the rapid growth of social economy, the industry and agriculture are booming, but at the same time, it also causes serious water environmental pollution problems, and there are a large number of organic matter, chlorine, heavy metal and other pollutants in water body and sediment, which causes serious pollution to water body. At present, the commonly used sewage treatment methods include dredging, chemical precipitation, river aeration, biological membrane and the like, but such methods have certain defects, such as large dredging engineering quantity, chemical precipitation treating the symptoms but not the root cause and the like, and a new river water treatment method is urgently needed. SUMMARY

[0003] In order to improve the treatment effect on water body, the present application provides a confined electric oxidation biochar and a preparation method thereof.

[0004] In a first aspect, the present application provides a confined electric oxidation biochar, which adopts the following technical scheme:

[0005] The confined electric oxidation biochar, the raw materials of the confined electric oxidation biochar include aggregate, powder and glue, and the weight ratio of the aggregate to the powder is (95:5)-(99:1).

[0006] By adopting the above technical scheme, when the weight ratio of the aggregate to the powder is (95:5)-(99:1), the glue is used to make the powder adhere to the aggregate, so that the powder is uniformly loaded on the surface of the aggregate, and the confined electric oxidation biochar is prepared. Therefore, when the confined electric oxidation biochar is used for water treatment, the powder will not move with the flow of water body, and the treatment effect of the water body is improved.

[0007] In a specific implementable scheme, the aggregate includes one or more of limestone, limestone, slag and zeolite.

[0008] By adopting the above technical scheme, the limestone, limestone, slag and zeolite are used as aggregate, which can improve the self-weight of the prepared confined electric oxidation biochar, and the limestone, limestone, slag and zeolite will not cause secondary pollution to water body.

[0009] In a specific implementable scheme, the glue includes one or more of guar gum, xanthan gum and pectin.

[0010] By adopting the above technical scheme, the guar gum, xanthan gum and pectin have good viscosity, and will not cause pollution to the environment, avoiding secondary pollution to water body.

[0011] In a specific implementable scheme, the powder is activated carbon powder.

[0012] In one specific implementation, the confined electro-oxidized biochar has a particle size of 15-20 mm.

[0013] In one specific implementation, the confined electro-oxidized biochar has a bulk density of 1.457-1.478 t / m 3 .

[0014] In a second aspect, the present application provides a preparation method of the confined electro-oxidized biochar, which adopts the following technical solution:

[0015] The preparation method of the confined electro-oxidized biochar comprises the following steps:

[0016] The glue and water are stirred and mixed uniformly to prepare a glue water solution:

[0017] The glue water solution and the aggregate are stirred and mixed uniformly to obtain a mixture;

[0018] The powder is added to the mixture and stirred and mixed uniformly, and then dried to obtain the confined electro-oxidized biochar.

[0019] By adopting the above technical solution, the glue and water are first stirred and mixed uniformly to obtain a glue water solution; then the aggregate is added and stirred uniformly, so that the glue water is uniformly bonded on the surface of the aggregate; finally, the powder is added and stirred and mixed uniformly, so that the powder is bonded on the aggregate, thereby obtaining the confined electro-oxidized biochar.

[0020] In one specific implementation, the weight ratio of the glue to water in the glue water solution is (1:99)-(3:97).

[0021] By adopting the above technical solution, the present application further limits the ratio of the glue to water in the glue water solution, so that the prepared glue water solution has good viscosity.

[0022] In one specific implementation, the powder is added to the mixture and stirred and mixed uniformly, and then dried at 30-40℃ for 4-6h to obtain the confined electro-oxidized biochar.

[0023] In a third aspect, the present application provides a use method of the confined electro-oxidized biochar, which adopts the following technical solution:

[0024] The use method of the confined electro-oxidized biochar comprises the following steps:

[0025] The confined electro-oxidized biochar is put into the water body to form a covering layer with a thickness of 3-20 cm on the bottom of the water body.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. When the weight ratio of the aggregate to the powder in the present application is (95:5)-(99:1), the glue is used to make the powder adhere to the aggregate, so that the powder is uniformly loaded on the surface of the aggregate, and the confined electro-oxidation biochar is prepared, so that when the confined electro-oxidation biochar is used for water treatment, the powder will not move with the flow of the water body, and the treatment effect of the water body is improved; 2. In the method of the present application, the glue and water are first stirred and mixed uniformly to obtain a glue solution; then the aggregate is added and stirred uniformly, so that the glue is uniformly bonded to the surface of the aggregate, and finally the powder is added and stirred and mixed uniformly, so that the powder is bonded to the aggregate, thereby obtaining the confined electro-oxidation biochar;

[0028] 3. In the construction method of the present application, the confined electro-oxidation biochar is put into the water body to form a 3-20 cm thick cover layer on the bottom of the water body, and the treatment effect of the water body is better. DETAILED DESCRIPTION

[0029] The present application will be further described in conjunction with the following examples.

[0030] All raw materials in the examples can be obtained by market purchase. The aggregate includes but is not limited to a mixture composed of one or more of limestone, limestone, slag, zeolite, and the like, and the preferred one in the present application is limestone; the glue includes but is not limited to a mixture composed of one or more of guar gum, xanthan gum, pectin, and the like, and the preferred one in the present application is xanthan gum.

[0031] EXAMPLE

[0032] Example 1

[0033] Example 1 provides a preparation method of confined electro-oxidation biochar, comprising the following steps:

[0034] The glue and water are stirred and mixed uniformly to prepare a glue solution: the weight ratio of the glue to the water is 1:99; the glue is xanthan gum;

[0035] The glue solution and the aggregate are added to a stirrer and stirred and mixed uniformly, so that the glue uniformly wraps the aggregate, and a mixture is obtained; the aggregate is limestone;

[0036] The powder is added to the mixture and stirred and mixed uniformly, and dried at 30°C for 6h to obtain the confined electro-oxidation biochar; the average particle size of the obtained confined electro-oxidation biochar is 15mm, and the bulk density is 1.457t / m 3 ; the powder is activated carbon powder; the weight ratio of the aggregate to the powder is 95:5.

[0037] Example 2

[0038] Example 2 provides a preparation method of confined electro-oxidation biochar, comprising the following steps:

[0039] The glue and water are stirred and mixed uniformly to prepare a glue water solution: the weight ratio of the glue to the water is 1:99; the glue is xanthan gum;

[0040] The glue water solution and the aggregate are added into a stirrer and stirred and mixed uniformly, so that the glue water uniformly wraps the aggregate, to obtain a mixture; the aggregate is limestone;

[0041] The powder is added into the mixture and stirred and mixed uniformly, and dried at 30°C for 6h to obtain the confined electro-oxidized biochar; the particle size of the obtained confined electro-oxidized biochar is 18mm, and the bulk density is 1.462t / m 3 ; the powder is activated carbon powder; the weight ratio of the aggregate to the powder is 60:1.

[0042] Example 3

[0043] Example 3 provides a preparation method of confined electro-oxidized biochar, comprising the following steps:

[0044] The glue and water are stirred and mixed uniformly to prepare a glue water solution: the weight ratio of the glue to the water is 1:99; the glue is xanthan gum;

[0045] The glue water solution and the aggregate are added into a stirrer and stirred and mixed uniformly, so that the glue water uniformly wraps the aggregate, to obtain a mixture; the aggregate is limestone;

[0046] The powder is added into the mixture and stirred and mixed uniformly, and dried at 30°C for 6h to obtain the confined electro-oxidized biochar; the particle size of the obtained confined electro-oxidized biochar is 20mm, and the bulk density is 1.464t / m 3 ; the powder is activated carbon powder; the weight ratio of the aggregate to the powder is 99:1.

[0047] Example 4

[0048] Example 4 provides a preparation method of confined electro-oxidized biochar, comprising the following steps:

[0049] The glue and water are stirred and mixed uniformly to prepare a glue water solution: the weight ratio of the glue to the water is 2:98; the glue is xanthan gum;

[0050] The glue water solution and the aggregate are added into a stirrer and stirred and mixed uniformly, so that the glue water uniformly wraps the aggregate, to obtain a mixture; the aggregate is limestone;

[0051] The powder is added into the mixture and stirred and mixed uniformly, and dried at 30°C for 6h to obtain the confined electro-oxidized biochar; the particle size of the obtained confined electro-oxidized biochar is 20mm, and the bulk density is 1.478t / m 3 ; the powder is activated carbon powder; the weight ratio of the aggregate to the powder is 60:1.

[0052] Example 5

[0053] Example 5 provides a method for preparing confined electro-oxidized biochar, comprising the following steps:

[0054] Mix the glue and water thoroughly to prepare a glue-water solution: the weight ratio of glue to water is 3:93; the glue is xanthan gum.

[0055] The glue solution and aggregate are added to a mixer and stirred until they are evenly mixed, so that the glue is evenly coated on the aggregate to obtain a mixture; the aggregate is limestone.

[0056] Powder was added to the mixture and stirred until homogeneous. The mixture was then dried at 30°C for 6 hours to obtain confined electro-oxidation biochar. The obtained confined electro-oxidation biochar had a particle size of 20 mm and a bulk density of 1.471 t / m³. 3 The powder is activated carbon powder; the weight ratio of aggregate to powder is 60:1.

[0057] Example 6

[0058] Example 6 provides a method for preparing confined electro-oxidized biochar, comprising the following steps:

[0059] Mix the glue and water thoroughly to prepare a glue-water solution: the weight ratio of glue to water is 2:98; the glue is xanthan gum.

[0060] The glue solution and aggregate are added to a mixer and stirred until they are evenly mixed, so that the glue is evenly coated on the aggregate to obtain a mixture; the aggregate is limestone.

[0061] Powder was added to the mixture and stirred until homogeneous. The mixture was then dried at 35°C for 5 hours to obtain confined electro-oxidation biochar. The obtained confined electro-oxidation biochar had a particle size of 20 mm and a bulk density of 1.476 t / m³. 3 The powder is activated carbon powder; the weight ratio of aggregate to powder is 60:1.

[0062] Example 7

[0063] Example 7 provides a method for preparing confined electro-oxidized biochar, comprising the following steps:

[0064] Mix the glue and water thoroughly to prepare a glue-water solution: the weight ratio of glue to water is 2:98; the glue is xanthan gum.

[0065] The glue solution and aggregate are added to a mixer and stirred until they are evenly mixed, so that the glue is evenly coated on the aggregate to obtain a mixture; the aggregate is limestone.

[0066] The powder is added into the mixture and stirred to mix uniformly, and the mixture is dried at 40°C for 4h to obtain the confined electro-oxidized biochar; the confined electro-oxidized biochar obtained has a particle size of 20mm and a bulk density of 1.459t / m 3 ; wherein the powder is activated carbon powder; and the weight ratio of the aggregate to the powder is 60:1.

[0067] Comparative Example 1

[0068] Comparative Example 1

[0069] The biochar of Comparative Example 1 is activated carbon powder.

[0070] Comparative Example 2

[0071] Comparative Example 2 provides a preparation method of confined electro-oxidized biochar, comprising the following steps:

[0072] The glue and water are stirred to mix uniformly to obtain a glue-water solution: the weight ratio of the glue to the water is 1:99; and the glue is xanthan gum.

[0073] The glue-water solution and the aggregate are added into a stirrer to stir and mix uniformly, so that the glue-water uniformly coats the aggregate to obtain a mixture; wherein the aggregate is limestone.

[0074] The powder is added into the mixture and stirred to mix uniformly, and the mixture is dried at 30°C for 6h to obtain the confined electro-oxidized biochar; the confined electro-oxidized biochar obtained has a particle size of 15mm and a bulk density of 1.457t / m 3 ; wherein the powder is activated carbon powder; and the weight ratio of the aggregate to the powder is 5:1.

[0075] Comparative Example 3

[0076] Comparative Example 3 provides a preparation method of confined electro-oxidized biochar, comprising the following steps:

[0077] The glue and water are stirred to mix uniformly to obtain a glue-water solution: the weight ratio of the glue to the water is 1:99; and the glue is xanthan gum.

[0078] The glue-water solution and the aggregate are added into a stirrer to stir and mix uniformly, so that the glue-water uniformly coats the aggregate to obtain a mixture; wherein the aggregate is limestone.

[0079] The powder is added into the mixture and stirred to mix uniformly, and the mixture is dried at 30°C for 6h to obtain the confined electro-oxidized biochar; the confined electro-oxidized biochar obtained has a particle size of 15mm and a bulk density of 1.457t / m 3 ; wherein the powder is activated carbon powder; and the weight ratio of the aggregate to the powder is 115:1.

[0080] Performance test of water purification effect: select a reservoir, add PbCl2, CdCl2, MnCl2, ZnCl2, KH2PO4 to the sediment to pollute the sediment. The corresponding compound dosage is calculated according to the preset ion concentration of Pb2+, Cd2+, Mn2+, Zn2+, PO3- respectively, and the specific value is shown in Table 1:

[0081] Table 1 Ion concentration in water and compound addition amount

[0082] Ion Ion concentration (g / kg) Compound dosage (g / kg) Na 0.5 0.5 0.5 0.5 0.5 0.5 0. Pb 2+ ]]> 300 0.4029 Cd 2+ ]] 50 0.0817 Mn 2+ ]] 1000 2.2891 Zn 2+ ]]> 500 1.0462 PO 3- ]] 500 2.1935

[0083] A 5L white polypropylene barrel with a lid is used as a contaminated sediment covering simulation test device. Before the test, black plastic film is used to wrap to avoid light. The completely mixed and uniform contaminated sediment is added from the top of the device to keep the thickness of the sediment at about 3cm. The confined electro-oxidation biochar material is directly poured into the contaminated sediment to be repaired to form a 3cm covering layer. The pure water is filled in a siphon way, covered and sealed to keep anaerobic. The above test is carried out in parallel, and the overlying water sample is taken at 0, 1, 3, 6, 10, 15, 21, 30d respectively. The ion concentration is measured. The experiment shows that after 20d, the covering system reaches stability, and at the end of the test, the ion concentration is tested again, the inhibition rate of each ion at 20d is calculated, and the inhibition rate = (treatment ion concentration before treatment-treatment ion concentration after treatment) / treatment ion concentration before treatment*100%. The higher the inhibition rate, the better the treatment effect of the water body.

[0084] Table 2 Performance test results of confined electro-oxidation biochar

[0085]

[0086] In combination with examples 1-3 and comparative examples 1-3, the treatment effect of the confined electro-oxidation biochar on sewage in examples 1-3 is better. It can be seen that when the ratio of aggregate to powder is (95:5)-(99:1), the powder is adhered to the aggregate by using glue, the self-weight of the confined electro-oxidation biochar is improved, and the powder does not move with the flow of the water body when the confined electro-oxidation biochar is used for water treatment, so the treatment effect of the water body is improved.

[0087] In combination with examples 2, 4 and 5, the treatment effect of the confined electro-oxidation biochar on sewage in example 4 is the best. It can be seen that when preparing the glue solution, when the ratio of glue to water in the glue solution is (1:99)-(3:97), increasing the ratio of the two, the treatment effect of the confined electro-oxidation biochar on sewage shows a trend of first increasing and then decreasing.

[0088] In combination with Example 4, Example 6 and Example 7, the treatment effect of the confined electro-oxidation biochar on sewage in Example 6 is the best, which shows that the drying condition of the material in Example 6 is the best, thus improving the adhesion effect of the powder.

[0089] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A confined electro-oxidized biochar, characterized in that: The raw material of the confined electro-oxidized biochar comprises aggregate, powder and glue, the weight ratio of the aggregate to the powder is (95:5)-(99:1), the aggregate comprises one or more of limestone, lime stone, slag and zeolite, the glue comprises one or more of guar gum, xanthan gum and pectin, and the powder is activated carbon powder.

2. The confined electro-oxidized biochar of claim 1, wherein: The confined electro-oxidized biochar has a particle size of 15-20 mm.

3. The confined electro-oxidized biochar of claim 1, wherein: The bulk density of the confined electro-oxidized biochar is 1.457-1.478 t / m 3 .

4. A method of producing a confined electro-oxidized biochar according to any one of claims 1-3, characterized by: The method comprises the following steps: The glue is stirred and mixed with water to prepare a glue water solution; The glue water solution is stirred and mixed with the aggregate to obtain a mixture; The powder is added to the mixture and stirred and mixed, and then dried to obtain the confined electro-oxidized biochar.

5. The method of claim 4, wherein: The weight ratio of the glue to water in the glue water solution is (1:99)-(3:97).

6. The method of claim 4, wherein: The powder is added to the mixture and stirred and mixed, and then dried at 30-40℃ for 4-6h to obtain the confined electro-oxidized biochar.

7. A method of using a confined electro-oxidized biochar as claimed in any one of claims 1 to 3, characterized in that: The method comprises the following steps: The confined electro-oxidized biochar is put into a water body to form a 3-20cm-thick covering layer on the bottom of the water body.

Images