A flocculant, its preparation method and application

Abstract

This invention provides a flocculant, its preparation method, and its application. The flocculant comprises plant root cellulose, modified chitin, lignin-based copolymer, modified agar, calcium silicate, and montmorillonite. The preparation method includes a one-step mixing of plant root cellulose, modified chitin, lignin-based copolymer, modified agar, calcium silicate, and montmorillonite, followed by uniform stirring to obtain the flocculant. The flocculant provided by this invention achieves efficient flocculation of suspended solids in water while reducing potential environmental impacts, lowering production costs, simplifying the preparation process, and facilitating large-scale application.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, and relates to a flocculant, and more particularly to a flocculant and its preparation method and application. Background Technology

[0002] In water treatment, especially in industrial and domestic wastewater treatment, it is necessary to efficiently remove suspended solids from water to meet discharge standards or reuse requirements. Suspended solids typically include organic matter, inorganic matter, microorganisms, oils, and metal ions. The presence of these impurities can severely affect water quality, increasing the difficulty of treatment. Furthermore, the physicochemical properties of suspended solids, such as particle size, density, and charge characteristics, also influence their behavior during the flocculation process.

[0003] Flocculants are substances used to accelerate the aggregation of suspended particles into large flocs, facilitating their separation from water through methods such as sedimentation or filtration. Common flocculants mainly include inorganic flocculants, synthetic organic polymeric flocculants, or natural polymeric flocculants. Their mechanisms of action include charge neutralization, adsorption bridging, and floc formation, and the efficiency of these mechanisms directly affects the flocculation effect. Generally speaking, an ideal flocculant needs to have selective adsorption capacity for different types of suspended solids to ensure efficient removal. Meanwhile, the complexity, cost, and scalability of the preparation process are key factors affecting the commercialization of flocculants.

[0004] However, the existing flocculants on the market generally have the following problems: (1) the flocculation effect is greatly affected by the pH of the water body and the removal effect on certain types of organic matter is limited; (2) there are environmental risks, such as poor biodegradability, and long-term use will have an adverse effect on the aquatic ecosystem; (3) the stability and repeatability need to be further improved, and the high cost or overly complicated preparation process limits its widespread application.

[0005] Therefore, how to provide a flocculant and its preparation method that can achieve efficient flocculation of suspended solids in water while reducing potential environmental impact has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a flocculant, its preparation method and application. The flocculant achieves efficient flocculation of suspended solids in water while reducing potential environmental impact, lowering production costs, simplifying the preparation process, and facilitating large-scale promotion and application.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a flocculant, the components of which include plant root cellulose, modified chitin, lignin-based copolymer, modified agar, calcium silicate, and montmorillonite.

[0009] This invention achieves highly efficient flocculation of suspended solids in water by optimizing the specific composition of the flocculant and leveraging the synergistic effects of various components. Plant root cellulose possesses excellent adsorption and trapping properties, effectively adsorbing suspended particles in water; modified chitin and modified agar further enhance the flocculant's adsorption and settling properties, facilitating floc formation and rapid sedimentation; lignin-based copolymers provide charge neutralization and bridging adsorption, enhancing floc stability; calcium silicate provides additional adsorption sites, strengthening the flocculant's flocculation capacity; and montmorillonite, with its high adsorption and ion exchange capacity, effectively adsorbs suspended particles and harmful ions in water. The combination and synergistic effect of these components ultimately results in a highly efficient and stable flocculant for water treatment. Furthermore, the use of naturally derived modified materials reduces potential environmental impact, facilitating large-scale application.

[0010] Preferably, the flocculant comprises the following components by weight percentage:

[0011]

[0012] The plant root cellulose comprises 25-40 wt% by weight, for example, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%, or 40 wt%, and the modified chitosan comprises 15-20 wt% by weight, for example, 15 wt%, 15.5 wt%, 16 wt%, or 16.5 wt%. The lignin-based copolymer is present in weight percentages of 5-10 wt%, for example, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt%, 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, or 10 wt%, and the modified agar is present in weight percentages of 13-15 wt%, for example, 13 wt%. The calcium silicate is present in weight percentages of 9-15 wt%, for example, 9 wt%, 9.5 wt%, 10 wt%, 10.5 wt%, 11 wt%, 11.5 wt%, 12 wt%, 12.5 wt%, 13 wt%, 13.5 wt%, 14 wt%, or 15 wt%, wherein the calcium silicate is 9-15 wt%, for example, 9 wt%, 9.5 wt%, 10 wt%, 10.5 wt%, 11 wt%, 11.5 wt%, 12 wt%, 12.5 wt%, 13 wt%, 13.5 wt%, 14 wt%, or 14.5 wt%. The montmorillonite content is 8-16 wt% or 15 wt%, for example, it can be 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%, 10.5 wt%, 11 wt%, 11.5 wt%, 12 wt%, 12.5 wt%, 13 wt%, 13.5 wt%, 14 wt%, 14.5 wt%, 15 wt%, 15.5 wt%, or 16 wt%, but is not limited to the listed values; other unlisted values ​​within this range also apply.

[0013] Preferably, the plant root cellulose comprises any one or a combination of at least two of cellulose ether, methylcellulose, hydroxypropyl methylcellulose, hydroxyethylcellulose, or carboxymethylcellulose. Typical but non-limiting combinations include combinations of cellulose ether and methylcellulose, combinations of methylcellulose and hydroxypropyl methylcellulose, combinations of hydroxypropyl methylcellulose and hydroxyethylcellulose, or combinations of hydroxyethylcellulose and carboxymethylcellulose.

[0014] Preferably, the mesh size of the plant root cellulose is not less than 100 mesh, for example, it can be 100 mesh, 150 mesh, 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh or 500 mesh, but it is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0015] Preferably, the modified chitin includes any one or a combination of at least two of acylated chitin, diethylenetriamine cross-grafted chitin, or N-xanthate-modified chitin sodium salt. Typical but non-limiting combinations include a combination of acylated chitin and diethylenetriamine cross-grafted chitin, a combination of diethylenetriamine cross-grafted chitin and N-xanthate-modified chitin sodium salt, a combination of acylated chitin and N-xanthate-modified chitin sodium salt, or a combination of acylated chitin, diethylenetriamine cross-grafted chitin, and N-xanthate-modified chitin sodium salt.

[0016] Preferably, the modified chitin has a mesh size of not less than 150 mesh, for example, it can be 150 mesh, 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh or 500 mesh, but it is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0017] Preferably, the comonomers of the lignin-based copolymer are isoacrylamide and hardwood lignin.

[0018] Preferably, the lignin-based copolymer has a mesh size of not less than 250 mesh, for example, it can be 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh or 500 mesh, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0019] Preferably, the modified agaroid comprises phenolic agaroid and / or agaroid copolymer.

[0020] Preferably, the modified agar has a mesh size of not less than 200 mesh, for example, it can be 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh or 500 mesh, but it is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0021] Preferably, the mesh ratio of the plant root cellulose, modified chitin, lignin-based copolymer, modified agar, calcium silicate, and montmorillonite is 100:150:250:200:300:300.

[0022] In a second aspect, the present invention provides a method for preparing the flocculant as described in the first aspect, the method comprising: one-step mixing of plant root cellulose, modified chitin, lignin-based copolymer, modified agar, calcium silicate and montmorillonite, and stirring evenly to obtain the flocculant.

[0023] This invention uses a one-step mixing process to prepare flocculants, which is simple, efficient, and low-cost, and facilitates rapid scaling up of production, significantly improving economic benefits.

[0024] Preferably, the uniformity of the flocculant is ≥99%, for example, it can be 99%, 99.1%, 99.2%, 99.3%, 99.4%, 99.5%, 99.6%, 99.7% or 99.8%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0025] Thirdly, the present invention provides an application of the flocculant as described in the first aspect, wherein the flocculant is used to flocculate suspended solids in water.

[0026] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] (1) This invention achieves highly efficient flocculation of suspended solids in water by optimizing the specific composition of the flocculant and leveraging the synergistic effect between various components. Plant root cellulose possesses excellent adsorption and trapping properties, effectively adsorbing suspended particles in water; modified chitin and modified agar further enhance the adsorption and settling properties of the flocculant, contributing to floc formation and rapid settling; lignin-based copolymers provide charge neutralization and bridging adsorption, enhancing floc stability; calcium silicate provides additional adsorption sites, enhancing the flocculation capacity of the flocculant; montmorillonite has high adsorption and ion exchange capabilities, effectively adsorbing suspended particles and harmful ions in water. The combination and synergistic effect of these components ultimately result in a highly efficient and stable flocculant for water treatment. Furthermore, the use of naturally sourced modified materials reduces potential environmental impact, facilitating large-scale application.

[0029] (2) The present invention uses a one-step mixing of various components to prepare flocculants, which is simple, efficient and inexpensive, and conducive to rapid scale-up of production, thus significantly improving economic benefits. Detailed Implementation

[0030] The technical solution of the present invention will be further illustrated below through specific embodiments.

[0031] Example 1

[0032] This embodiment provides a flocculant and its preparation method. The specific components of the flocculant are shown in Table 1 below.

[0033] Table 1

[0034]

[0035] The preparation method provided in this embodiment is as follows: mix the above-mentioned components in one step and stir until the homogeneity is 99.5% to obtain the flocculant.

[0036] Example 2

[0037] This embodiment provides a flocculant and its preparation method. The specific components of the flocculant are shown in Table 2 below.

[0038] Table 2

[0039]

[0040]

[0041] The preparation method provided in this embodiment is as follows: mix the above-mentioned components in one step and stir until the homogeneity is 99.8% to obtain the flocculant.

[0042] Example 3

[0043] This embodiment provides a flocculant and its preparation method. The specific components of the flocculant are shown in Table 3 below.

[0044] Table 3

[0045]

[0046] The preparation method provided in this embodiment is as follows: mix the above-mentioned components in one step and stir until the homogeneity is 99% to obtain the flocculant.

[0047] Example 4

[0048] This embodiment provides a flocculant and its preparation method. Except that the mesh size of each component in the flocculant is changed to 100 mesh, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0049] Example 5

[0050] This embodiment provides a flocculant and its preparation method. Except that the mesh size of all components in the flocculant is changed to 200 mesh, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0051] Example 6

[0052] This embodiment provides a flocculant and its preparation method. Except that the mesh size of all components in the flocculant is changed to 300 mesh, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0053] Comparative Example 1

[0054] This comparative example provides a flocculant and its preparation method. Except for the absence of cellulose ether, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0055] Comparative Example 2

[0056] This comparative example provides a flocculant and its preparation method. Except for the absence of acylated chitosan, the other steps and conditions are the same as in Example 1, and therefore will not be repeated here.

[0057] Comparative Example 3

[0058] This comparative example provides a flocculant and its preparation method. Except for the absence of isoacrylamide-hardwood lignin copolymer, the other steps and conditions are the same as in Example 1, and therefore will not be repeated here.

[0059] Comparative Example 4

[0060] This comparative example provides a flocculant and its preparation method. Except for the absence of agarose copolymer, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0061] Comparative Example 5

[0062] This comparative example provides a flocculant and its preparation method. Except for the absence of calcium silicate, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0063] Comparative Example 6

[0064] This comparative example provides a flocculant and its preparation method. Except for the absence of montmorillonite, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0065] Performance testing

[0066] Twelve wastewater samples (1 L each) were prepared, with the pH controlled at 4, water temperature at 20℃, and suspended particle concentration at 100 ppm. The flocculants obtained in Examples 1-6 and Comparative Examples 1-6 were added to the above 12 wastewater samples at a concentration of 50 ppm, respectively. The mixture was stirred thoroughly to ensure sufficient contact between the flocculant and the suspended particles in the wastewater. After stirring for 5 hours, the suspended particle concentration in the wastewater was measured. The relevant test results are shown in Table 1 below.

[0067] Table 1

[0068] flocculants Suspended particulate concentration (ppm) Flocculation efficiency (%) Example 1 0.462 99.54 Example 2 0.383 99.62 Example 3 0.422 99.58 Example 4 1.349 98.65 Example 5 1.238 98.76 Example 6 1.213 98.79 Comparative Example 1 13.558 86.44 Comparative Example 2 16.739 83.26 Comparative Example 3 15.382 84.62 Comparative Example 4 23.742 76.26 Comparative Example 5 18.648 82.35 Comparative Example 6 10.671 89.32

[0069] Therefore, this invention achieves highly efficient flocculation of suspended solids in water by optimizing the specific composition of the flocculant and leveraging the synergistic effects of various components. Specifically, plant root cellulose possesses excellent adsorption and trapping properties, effectively adsorbing suspended particles in water; modified chitin and modified agar further enhance the flocculant's adsorption and settling properties, facilitating floc formation and rapid sedimentation; lignin-based copolymers provide charge neutralization and bridging adsorption, enhancing floc stability; calcium silicate provides additional adsorption sites, strengthening the flocculant's flocculation capacity; and montmorillonite exhibits high adsorption and ion exchange capabilities, effectively adsorbing suspended particles and harmful ions in water. The combination and synergistic effect of these components ultimately result in a highly efficient and stable flocculant for water treatment. Furthermore, the use of naturally derived modified materials reduces potential environmental impact, facilitating large-scale application.

[0070] Furthermore, the present invention uses a one-step mixing process to prepare flocculants, which is simple, efficient, and inexpensive, and facilitates rapid scaling up of production, thus significantly improving economic benefits.

[0071] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flocculant, characterized in that, The flocculant comprises the following components by weight percentage: Plant root cellulose 25-40 wt% Modified chitosan 15-20 wt% 5-10 wt% lignin-based copolymers Modified agar 13-15 wt%; Calcium silicate 9-15 wt%; Montmorillonite 8-16 wt%; The mesh ratio of the plant root cellulose, modified chitin, lignin-based copolymer, modified agar, calcium silicate and montmorillonite is 100:150:250:200:300:

300. The plant root cellulose includes any one or a combination of at least two of cellulose ethers, methylcellulose, hydroxypropyl methylcellulose, hydroxyethylcellulose, or carboxymethylcellulose.

2. The flocculant according to claim 1, characterized in that, The cellulose from the plant root has a mesh size of not less than 100 mesh.

3. The flocculant according to claim 1, characterized in that, The modified chitin includes any one or a combination of at least two of acylated chitin, diethylenetriamine cross-grafted chitin, or N-xanthate-modified chitin sodium salt.

4. The flocculant according to claim 3, characterized in that, The modified chitin has a mesh size of not less than 150 mesh.

5. The flocculant according to claim 1, characterized in that, The comonomers of the lignin-based copolymer are isoacrylamide and hardwood lignin.

6. The flocculant according to claim 5, characterized in that, The lignin-based copolymer has a mesh size of not less than 250 mesh.

7. The flocculant according to claim 1, characterized in that, The modified agarose includes phenolic agarose and / or agarose copolymers.

8. The flocculant according to claim 7, characterized in that, The modified agar has a mesh size of not less than 200 mesh.

9. A method for preparing the flocculant according to any one of claims 1-8, characterized in that, The preparation method includes: a one-step mixing of plant root cellulose, modified chitin, lignin-based copolymer, modified agar, calcium silicate, and montmorillonite, followed by uniform stirring to obtain the flocculant.

10. The preparation method according to claim 9, characterized in that, The uniformity of the flocculant is ≥99%.

11. An application of the flocculant as described in any one of claims 1-8, characterized in that, The flocculant is used to flocculate suspended solids in water.

Images