A filler for enhancing biocompatibility and its manufacturing method and application

Abstract

The present invention provides a filler with enhanced biocompatibility, as well as a manufacturing method and application thereof. The method increases the specific surface area and relative roughness of the filler particle surface by subjecting the filler raw material to mechanical activation and screening treatment, which is beneficial to the attachment of microorganisms. Then, the filler particle surface is cleaned with an organic acid solution to increase defect sites, which is more conducive to the attachment of microorganisms. Furthermore, the filler is immersed in a surfactant to improve the stability of the filler so that it will not be dispersed by water flow and cause the loss of microorganisms. Then, after the filler is wrapped with a bundle net, it is placed in a biological culture solution and aerated to provide sufficient dissolved oxygen to create an environment more conducive to the survival of microorganisms. Finally, it is air-dried under natural conditions to obtain the target filler, which effectively solves the problem of poor biocompatibility of the surface of traditional filter bed fillers.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a filler for enhancing biocompatibility and a manufacturing method and application thereof. Background Art

[0002] Since its development and application, the biofilter has been valued by researchers. Through continuous research from low-load biofilter to high-load biofilter, it has become an increasingly mature technology for treating domestic sewage, urban sewage, industrial wastewater and other fields. When wastewater passes through a high-load biofilter, the filler intercepts the suspended matter in the wastewater, allowing the microorganisms to multiply quickly. The microorganisms further adsorb the soluble and colloidal organic matter in the wastewater, gradually grow and form a biofilm. The biofilter relies on the adsorption and oxidation of organic matter in the wastewater by the biofilm on the surface of the filter material to purify the wastewater.

[0003] In the biofilter, the number of microbial species, the size of biomass, the activity of microorganisms and other characteristics determine the treatment load and treatment effect, while the filler that enhances biocompatibility is the core part and plays a key role. The filler is the place where the biofilm lives and is the carrier of the biofilm. It affects the growth, reproduction, shedding, morphology and spatial structure of microorganisms. It also has the function of intercepting suspended matter and is also the main factor affecting the investment and operation costs of sewage treatment projects.

[0004] Existing fillers are generally divided into three types according to their properties: inorganic fillers, organic polymer fillers and composite fillers. However, these traditional fillers are generally only subjected to physical treatment, such as grinding. This treatment can allow certain microorganisms to adhere to the surface of the filler, but this method does not provide a growth environment for the microorganisms, and it is easy to cause a large number of microorganisms attached to the surface of the filler to be lost, thereby reducing the sewage treatment capacity. Summary of the invention

[0005] Based on this, an embodiment of the present invention provides a filler with enhanced biocompatibility, and a manufacturing method and application thereof, aiming to solve the problem of poor biocompatibility of traditional fillers in the prior art.

[0006] A first aspect of an embodiment of the present invention provides a method for preparing a filler with enhanced biocompatibility, comprising the following steps:

[0007] The filler raw material is subjected to mechanical activation and screening treatment to obtain a first filler;

[0008] The first filler is cleaned with an organic acid solution, and the cleaned first filler is immersed in a surfactant, and then drained to obtain a second filler;

[0009] After wrapping the second filler with a tie-mouth net, placing it in a biological culture solution, and aerating it, a third filler is obtained;

[0010] The third filler is air-dried under natural conditions to obtain the target filler.

[0011] Furthermore, the filler raw material is one or more of diatomaceous earth, volcanic rock, vermiculite, bentonite, feldspar, quartz, sepiolite, zeolite, dolomite, black talc, kaolin, montmorillonite, and apatite.

[0012] Furthermore, in the step of subjecting the filler raw material to mechanical activation and screening to obtain the first filler, the filler raw material is subjected to grinding and screening in sequence to control the particle size of the first filler to be above 40 meshes.

[0013] Furthermore, the organic acid solution includes one or more of tartrate, oxalate, malate, citrate, ascorbate, and sodium alginate, and the organic acid content in the organic acid solution is 0.5% to 5%.

[0014] Furthermore, the surfactant includes one of sodium lauryl sulfate, sodium lignin sulfonate, and sodium stearate, and the concentration of the surfactant is 0.1% to 1%.

[0015] Furthermore, in the step of soaking the cleaned first filler in a surfactant, the soaking time is 10s to 90s.

[0016] Furthermore, the diameter of the opening of the beam mesh is smaller than the particle size of the first filler.

[0017] Furthermore, the biological culture solution includes 1g / L~10g / L of glucose, 0.5g / L~5g / L of ammonium salt, 0.2g / L~2g / L of calcium salt, 0.1g / L~1g / L of sodium salt, 0.05g / L~0.5g / L of potassium salt, 0.1g / L~1g / L of phosphate, and 0.5g / L~5g / L of sulfate, and the temperature of the biological culture solution is 20°C~35°C, and the pH value is 6.5~8.

[0018] A second aspect of an embodiment of the present invention provides a filler with enhanced biocompatibility. The filler with enhanced biocompatibility is prepared by the above-mentioned method for preparing a filler with enhanced biocompatibility.

[0019] A third aspect of an embodiment of the present invention provides an application of a filler with enhanced biocompatibility in sewage treatment, wherein the filler with enhanced biocompatibility is prepared by the above-mentioned method for preparing the filler with enhanced biocompatibility, and the filler with enhanced biocompatibility is filled into a filter bed.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] By subjecting the filler raw materials to mechanical activation and screening treatment, the specific surface area and relative roughness of the filler particle surface are increased, which is beneficial to the attachment of microorganisms. The surface of the filler particles is then cleaned with an organic acid solution to increase defect sites, making it easier for microorganisms to attach. Furthermore, the filler is immersed in a surfactant to improve the stability of the filler so that it will not be dispersed by water flow and cause the loss of microorganisms. The filler is then wrapped with a bundle net and placed in a biological culture solution, which is aerated to provide sufficient dissolved oxygen and create an environment that is more conducive to the survival of microorganisms. Finally, it is air-dried under natural conditions to obtain the target filler, which effectively solves the problem of poor biocompatibility on the surface of traditional filter bed fillers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the constriction net being placed in a biological culture medium in a hanging manner;

[0023] Figure 2 It is a schematic diagram of the constriction net being placed in the biological culture medium in a manner supported by a bottom plate;

[0024] Figure 3 This is a surface morphology of the target filler obtained in Example 1;

[0025] Figure 4 This is the surface morphology of the filler obtained in Comparative Example 1.

[0026] The following specific implementation manner will be further described in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] In one aspect, the present invention aims at the problem that conventional fillers have poor biocompatibility, and proposes a method for preparing a filler with enhanced biocompatibility, wherein the preparation method comprises the following steps:

[0031] The filler raw material is subjected to mechanical activation and screening treatment to obtain a first filler;

[0032] The first filler is cleaned with an organic acid solution, and the cleaned first filler is immersed in a surfactant, and the second filler is obtained after draining;

[0033] After the second filler is wrapped with a tie-mouth net, a biological culture solution is placed therein and aerated to obtain a third filler;

[0034] The third filler is air-dried under natural conditions to obtain the target filler.

[0035] In some embodiments of the present invention, the filler raw material is one or more of diatomaceous earth, volcanic rock, vermiculite, bentonite, feldspar, quartz, sepiolite, zeolite, dolomite, black talc, kaolin, montmorillonite, and apatite.

[0036] In some embodiments of the present invention, in the step of obtaining the first filler by subjecting the filler raw material to mechanical activation and screening, the filler raw material is successively subjected to grinding and screening to control the particle size of the first filler to be above 40 meshes.

[0037] In some embodiments of the present invention, the organic acid solution includes one or more of tartrate, oxalate, malate, citrate, ascorbate, and sodium alginate, and the organic acid content in the organic acid solution is 0.5% to 5%.

[0038] In some embodiments of the present invention, the surfactant includes one of sodium lauryl sulfate, sodium lignin sulfonate, and sodium stearate, and the concentration of the surfactant is 0.1% to 1%.

[0039] In some embodiments of the present invention, in the step of soaking the cleaned first filler in a surfactant, the soaking time is 10s to 90s.

[0040] In some embodiments of the present invention, the diameter of the tie net is smaller than the number of particles of the first filler, that is, no particle leakage occurs. At the same time, the material of the tie net is required to have high mechanical strength, good stability, and no toxicity to microorganisms. Specifically, the tie net can be a stainless steel net, a metal wire mesh, a polyurethane net, a polyethylene net, or a nylon net. In addition, the tie net can be placed in the biological culture medium by hanging or supporting the chassis, such as Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the constriction net being placed in the biological culture medium in a hanging manner. Figure 2 This is a schematic diagram of a constriction net being placed in a biological culture medium with the support of a chassis.

[0041] In some embodiments of the present invention, the biological culture medium includes 1g / L~10g / L of glucose, 0.5g / L~5g / L of ammonium salt, 0.2g / L~2g / L of calcium salt, 0.1g / L~1g / L of sodium salt, 0.05g / L~0.5g / L of potassium salt, 0.1g / L~1g / L of phosphate, and 0.5g / L~5g / L of sulfate, and the temperature of the biological culture medium is 20℃~35℃, and the pH value is 6.5~8.

[0042] Specifically, the actual process of preparing the filler with enhanced biocompatibility can be as follows: mechanically activate and screen the filler raw material to obtain a first filler with a particle size greater than 40 mesh, then use an organic acid solution to clean the first filler, and soak the cleaned first filler in a surfactant, drain to obtain a second filler, and then wrap the second filler with a stainless steel mesh, put it into a biological culture solution, and aerate it through a microporous bubble disk under the stainless steel mesh to obtain a third filler, and finally air-dry the third filler under natural conditions to obtain the target filler.

[0043] Another aspect of the present invention further provides a filler with enhanced biocompatibility, which is prepared by the above-mentioned method for preparing a filler with enhanced biocompatibility.

[0044] On the other hand, the present invention also proposes an application of a filler with enhanced biocompatibility in sewage treatment. The filler with enhanced biocompatibility is prepared by the above-mentioned preparation method of the filler with enhanced biocompatibility, and the filler with enhanced biocompatibility is filled into a filter bed.

[0045] In order to facilitate understanding of the present invention, several embodiments of the present invention are provided below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0046] Embodiment 1

[0047] In this embodiment, after vermiculite, volcanic rock and diatomaceous earth are mixed in a mass ratio of 1:1:1, a disc vibrating mill is used to grind the mixture particles to between 40 mesh and 100 mesh to obtain a first filler, and then the first filler is cleaned with a 1% citrate solution, and the cleaned first filler is placed in a 1% sodium lignin sulfonate solution and soaked for 60 seconds, and the second filler is obtained after drainage, and then the second filler is wrapped with a stainless steel mesh with an aperture of 200 mesh, and then placed in a biological culture solution, and aerated through a microporous bubble disk under the stainless steel mesh to obtain a third filler, wherein the biological culture solution includes 10g / L glucose, 3g / L (NH4)2SO4, 1g / L Ca(NO3)2, 0.5g / L K2HPO4, 0.5g / L MgSO4·7H2O, and 0.1g / L KCl, and finally the third filler is air-dried under natural conditions to obtain the target filler.

[0048] In addition, the target filler is filled into the filter bed to treat the organic pollutants in the sewage when it passes through the filter bed. The COD of the sewage to be treated in this embodiment is 205 mg / L, NH3-N is 112 mg / L, the total nitrogen is 165 mg / L, and the total phosphorus is 23 mg / L. The sewage is passed into the filter bed. After 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 25.33 mg / L, NH3-N is 13.13 mg / L, the total nitrogen is 35.22 mg / L, and the total phosphorus is 0.37 mg / L.

[0049] Comparative Example 1

[0050] In this embodiment, vermiculite, volcanic rock and diatomaceous earth in a mass ratio of 1:1:1 are mixed and filled into a filter bed, so that when the sewage passes through the filter bed, the organic pollutants in the sewage are treated. Among them, the COD in the sewage to be treated in this embodiment is 159 mg / L, NH3-N is 87 mg / L, the total nitrogen is 115 mg / L, and the total phosphorus is 19.8 mg / L. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 52.31 mg / L, NH3-N is 19.11 mg / L, the total nitrogen is 35.64 mg / L, and the total phosphorus is 1.31 mg / L.

[0051] Embodiment 2

[0052] In this embodiment, after vermiculite, volcanic rock and diatomaceous earth are mixed in a mass ratio of 3:2:1, a disc vibrating mill is used to grind the mixture particles to between 40 mesh and 100 mesh to obtain a first filler, and then the first filler is cleaned with a 1% citrate solution, and the cleaned first filler is placed in a 1% sodium lignin sulfonate solution and soaked for 60 seconds, and then the second filler is obtained after drainage, and then the second filler is wrapped with a stainless steel mesh with an aperture of 200 mesh, and then placed in a biological culture solution, and aerated through a microporous bubble disk under the stainless steel mesh to obtain a third filler, wherein the biological culture solution includes 10g / L glucose, 3g / L (NH4)2SO4, 1g / L Ca(NO3)2, 0.5g / L K2HPO4, 0.5g / L MgSO4·7H2O, and 0.1g / L KCl, and finally the third filler is air-dried under natural conditions to obtain the target filler.

[0053] In addition, the target filler is filled into the filter bed to treat the organic pollutants in the sewage when it passes through the filter bed. The COD in the sewage to be treated in this embodiment is 85 mg / L, NH3-N is 69 mg / L, total nitrogen is 78 mg / L, and total phosphorus is 3.6 mg / L. The sewage is passed into the filter bed. After 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the effluent is 15.07 mg / L, NH3-N is 0.45 mg / L, total nitrogen is 8.45 mg / L, and total phosphorus is 0.02 mg / L.

[0054] Comparative Example 2

[0055] In this embodiment, vermiculite, volcanic rock and diatomaceous earth in a mass ratio of 3:2:1 are mixed and filled into a filter bed, so that when the sewage passes through the filter bed, the organic pollutants in the sewage are treated. Among them, the COD in the sewage to be treated in this embodiment is 124 mg / L, NH3-N is 87 mg / L, the total nitrogen is 121 mg / L, and the total phosphorus is 11.2 mg / L. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 74.59 mg / L, NH3-N is 47.17 mg / L, the total nitrogen is 61.13 mg / L, and the total phosphorus is 4.21 mg / L.

[0056] Embodiment 3

[0057] In this embodiment, after vermiculite, volcanic rock and diatomaceous earth are mixed in a mass ratio of 3:2:2, a disc vibrating mill is used to grind the mixture particles to between 40 mesh and 100 mesh to obtain a first filler, and then the first filler is cleaned with a 1% citrate solution, and the cleaned first filler is placed in a 1% sodium lignin sulfonate solution and soaked for 60 seconds, and the second filler is obtained after drainage, and then the second filler is wrapped with a stainless steel mesh with an aperture of 200 mesh, and then placed in a biological culture solution, and aerated through a microporous bubble disk under the stainless steel mesh to obtain a third filler, wherein the biological culture solution includes 10g / L glucose, 3g / L (NH4)2SO4, 1g / L Ca(NO3)2, 0.5g / L K2HPO4, 0.5g / L MgSO4·7H2O, and 0.1g / L KCl, and finally the third filler is air-dried under natural conditions to obtain the target filler.

[0058] In addition, the target filler is filled into the filter bed to treat the organic pollutants in the sewage when it passes through the filter bed. The COD, NH3-N, total nitrogen and total phosphorus in the sewage to be treated in this embodiment are 98 mg / L, 87 mg / L, 102 mg / L, and 13 mg / L. The sewage is passed into the filter bed. After 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 18.38 mg / L, NH3-N is 7.2 mg / L, the total nitrogen is 13.99 mg / L, and the total phosphorus is 0.2 mg / L.

[0059] Comparative Example 3

[0060] In this embodiment, vermiculite, volcanic rock and diatomaceous earth in a mass ratio of 3:2:2 are mixed and filled into a filter bed, so that when the sewage passes through the filter bed, the organic pollutants in the sewage are treated. Among them, the COD in the sewage to be treated in this embodiment is 108 mg / L, NH3-N is 75 mg / L, the total nitrogen is 98 mg / L, and the total phosphorus is 9.3 mg / L. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 78.1 mg / L, NH3-N is 35.45 mg / L, the total nitrogen is 49.7 mg / L, and the total phosphorus is 3.36 mg / L.

[0061] Embodiment 4

[0062] In this embodiment, after vermiculite, volcanic rock and diatomaceous earth are mixed in a mass ratio of 1:1:2, a disc vibrating mill is used to grind the mixture particles to between 40 mesh and 100 mesh to obtain a first filler, and then the first filler is cleaned with a 1% citrate solution, and the cleaned first filler is placed in a 1% sodium lignin sulfonate solution and soaked for 60 seconds, and the second filler is obtained after drainage, and then the second filler is wrapped with a stainless steel mesh with an aperture of 200 mesh, and then placed in a biological culture solution, and aerated through a microporous bubble disk under the stainless steel mesh to obtain a third filler, wherein the biological culture solution includes 10g / L glucose, 3g / L (NH4)2SO4, 1g / L Ca(NO3)2, 0.5g / L K2HPO4, 0.5g / L MgSO4·7H2O, and 0.1g / L KCl, and finally the third filler is air-dried under natural conditions to obtain the target filler.

[0063] In addition, the target filler is filled into the filter bed to treat the organic pollutants in the sewage when it passes through the filter bed. The COD, NH3-N, total nitrogen and total phosphorus in the sewage to be treated in this embodiment are 69 mg / L, 47 mg / L, 58 mg / L, and 1.8 mg / L, respectively. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 9.46 mg / L, NH3-N is 7.05 mg / L, the total nitrogen is 12.18 mg / L, and the total phosphorus is 0.02 mg / L.

[0064] Comparative Example 4

[0065] In this embodiment, vermiculite, volcanic rock and diatomaceous earth in a mass ratio of 1:1:2 are mixed and filled into a filter bed, so that when the sewage passes through the filter bed, the organic pollutants in the sewage are treated. Among them, the COD in the sewage to be treated in this embodiment is 79 mg / L, NH3-N is 52 mg / L, the total nitrogen is 72 mg / L, and the total phosphorus is 2.8 mg / L. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 39.27 mg / L, NH3-N is 22.49 mg / L, the total nitrogen is 32.75 mg / L, and the total phosphorus is 1.01 mg / L.

[0066] Embodiment 5

[0067] In this embodiment, after vermiculite, volcanic rock and diatomaceous earth are mixed in a mass ratio of 2:2:1, a disc vibrating mill is used to grind the mixture particles to between 40 mesh and 100 mesh to obtain a first filler, and then the first filler is cleaned with a 1% citrate solution, and the cleaned first filler is placed in a 1% sodium lignin sulfonate solution and soaked for 60 seconds, and the second filler is obtained after drainage, and then the second filler is wrapped with a stainless steel mesh with an aperture of 200 mesh, and then placed in a biological culture solution, and aerated through a microporous bubble disk under the stainless steel mesh to obtain a third filler, wherein the biological culture solution includes 10g / L glucose, 3g / L (NH4)2SO4, 1g / L Ca(NO3)2, 0.5g / L K2HPO4, 0.5g / L MgSO4·7H2O, and 0.1g / L KCl, and finally the third filler is air-dried under natural conditions to obtain the target filler.

[0068] In addition, the target filler is filled into the filter bed to treat the organic pollutants in the sewage when it passes through the filter bed. The COD, NH3-N, total nitrogen and total phosphorus in the sewage to be treated in this embodiment are 85 mg / L, 69 mg / L, 85 mg / L and 2.5 mg / L, respectively. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD, NH3-N, total nitrogen and total phosphorus in the effluent are 5.01 mg / L, 9.16 mg / L, 12.57 mg / L and 0.01 mg / L, respectively.

[0069] Comparative Example 5

[0070] In this embodiment, vermiculite, volcanic rock and diatomaceous earth in a mass ratio of 2:2:1 are mixed and filled into a filter bed, so that when the sewage passes through the filter bed, the organic pollutants in the sewage are treated. Among them, the COD in the sewage to be treated in this embodiment is 86 mg / L, NH3-N is 58 mg / L, the total nitrogen is 73 mg / L, and the total phosphorus is 1.7 mg / L. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 36.26 mg / L, the NH3-N is 28.05 mg / L, the total nitrogen is 43.09 mg / L, and the total phosphorus is 1.01 mg / L.

[0071] Embodiment 6

[0072] In this embodiment, after vermiculite, volcanic rock and diatomaceous earth are mixed in a mass ratio of 3:3:1, a disc vibrating mill is used to grind the mixture particles to between 40 mesh and 100 mesh to obtain a first filler, and then the first filler is cleaned with a 1% citrate solution, and the cleaned first filler is placed in a 1% sodium lignin sulfonate solution and soaked for 60 seconds, and the second filler is obtained after drainage, and then the second filler is wrapped with a stainless steel mesh with an aperture of 200 mesh, and then placed in a biological culture solution, and aerated through a microporous bubble disk under the stainless steel mesh to obtain a third filler, wherein the biological culture solution includes 10g / L glucose, 3g / L (NH4)2SO4, 1g / L Ca(NO3)2, 0.5g / L K2HPO4, 0.5g / L MgSO4·7H2O, and 0.1g / L KCl, and finally the third filler is air-dried under natural conditions to obtain the target filler.

[0073] In addition, the target filler is filled into the filter bed to treat the organic pollutants in the sewage when it passes through the filter bed. The COD, NH3-N, total nitrogen and total phosphorus in the sewage to be treated in this embodiment are 96 mg / L, 58 mg / L, 75 mg / L and 2.6 mg / L, respectively. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 7.95 mg / L, NH3-N is 2.15 mg / L, the total nitrogen is 5.25 mg / L, and the total phosphorus is not detected.

[0074] Comparative Example 6

[0075] In this embodiment, vermiculite, volcanic rock and diatomaceous earth in a mass ratio of 3:3:1 are mixed and filled into a filter bed, so that when the sewage passes through the filter bed, the organic pollutants in the sewage are treated. Among them, the COD in the sewage to be treated in this embodiment is 96 mg / L, NH3-N is 51 mg / L, the total nitrogen is 68 mg / L, and the total phosphorus is 2.1 mg / L. The sewage is passed into the filter bed, and after 125 days of sewage treatment, the COD, NH3-N, total nitrogen and total phosphorus are measured. Specifically, the COD in the effluent is 36.08 mg / L, NH3-N is 31.02 mg / L, the total nitrogen is 40.54 mg / L, and the total phosphorus is 0.8 mg / L.

[0076] Please refer to the following Table 1, which shows the parameters corresponding to the above-mentioned Examples 1 to 6 and Comparative Examples 1 to 6 of the present invention.

[0077] Table 1:

[0078] Example filler Proportion Drawstring bag fixing method Number of days of operation Comparative Example 1 Vermiculite, volcanic rock and diatomaceous earth 1：1：1 none 125 Example 1 Vermiculite, volcanic rock and diatomaceous earth 1：1：1 suspension 125 Comparative Example 2 Vermiculite, volcanic rock and diatomaceous earth 3：2：1 none 125 Example 2 Vermiculite, volcanic rock and diatomaceous earth 3：2：1 Chassis support 125 Comparative Example 3 Vermiculite, volcanic rock and diatomaceous earth 3：2：2 none 125 Example 3 Vermiculite, volcanic rock and diatomaceous earth 3：2：2 Chassis support 125 Comparative Example 4 Vermiculite, volcanic rock and diatomaceous earth 1：1：2 none 125 Example 4 Vermiculite, volcanic rock and diatomaceous earth 1：1：2 suspension 125 Comparative Example 5 Vermiculite, volcanic rock and diatomaceous earth 2：2：1 none 125 Example 5 Vermiculite, volcanic rock and diatomaceous earth 2：2：1 Chassis support 125 Comparative Example 6 Vermiculite, volcanic rock and diatomaceous earth 3：3：1 none 125 Example 6 Vermiculite, volcanic rock and diatomaceous earth 3：3：1 Chassis support 125

[0079] In actual application, the corresponding target fillers are prepared by the preparation methods and parameters corresponding to the above-mentioned embodiments 1 to 6 and comparative examples 1 to 6 of the present invention and filled into the filter bed, and the sewage is passed through the filter bed, and the pollutant concentration in the sewage is detected regularly, wherein the detected pollutants include COD, NH3-N and total phosphorus. The test data are shown in Table 2 below.

[0080] Table 2:

[0081]

[0082]

[0083] Combining the data in Table 1 and Table 2 above, it can be clearly seen that the target fillers prepared in Examples 1 to 6 of the present invention, due to the improved biocompatibility in the target fillers, are used to treat sewage after filling the filter bed, and the decontamination efficiency of high-concentration organic wastewater is significantly improved. Compared with Comparative Example 1, the COD treatment efficiency in Example 1 is increased by 20%, NH3-N is increased by 10%, total nitrogen is increased by 9%, and total phosphorus is increased by 5%; compared with Comparative Example 2, the COD treatment efficiency in Example 2 is increased by 42%, NH3-N is increased by 53%, total nitrogen is increased by 40%, and total phosphorus is increased by 37%; compared with Comparative Example 3, Example 4 In Example 3, the COD treatment efficiency is increased by 53%, NH3-N is increased by 38%, total nitrogen is increased by 37%, and total phosphorus is increased by 35%; compared with Comparative Example 4, the COD treatment efficiency in Example 4 is increased by 36%, NH3-N is increased by 28%, total nitrogen is increased by 25%, and total phosphorus is increased by 34%; compared with Comparative Example 5, the COD treatment efficiency in Example 5 is increased by 36%, NH3-N is increased by 35%, total nitrogen is increased by 44%, and total phosphorus is increased by 59%; compared with Comparative Example 6, the COD treatment efficiency in Example 6 is increased by 29%, NH3-N is increased by 57%, total nitrogen is increased by 53%, and total phosphorus is increased by 38%.

[0084] In addition, the target filler obtained in Example 1 and the filler in Comparative Example 1 were scanned by electron microscope. The results of the scanning electron microscope are as follows: Figure 3 and Figure 4 As shown, Figure 3 This is the surface morphology of the target filler obtained in Example 1. Figure 4 This is the surface morphology of the filler obtained in Comparative Example 1. It can be seen that the corrosion gaps on the surface of the filler after treatment increase, and the specific surface area increases, making it easier for bacteria to attach and grow.

[0085] In summary, the present invention relates to a filler with enhanced biocompatibility, as well as a manufacturing method and application thereof. The method increases the specific surface area and relative roughness of the filler particle surface by subjecting the filler raw material to mechanical activation and screening treatment, which is beneficial to the attachment of microorganisms. The surface of the filler particles is then cleaned with an organic acid solution to increase defect sites, making it easier for microorganisms to attach. Furthermore, the filler is immersed in a surfactant to improve the stability of the filler so that it will not be dispersed by water flow and cause the loss of microorganisms. The filler is then wrapped with a bundle net and placed in a biological culture solution, and aerated to provide sufficient dissolved oxygen to create an environment that is more conducive to the survival of microorganisms. Finally, it is air-dried under natural conditions to obtain the target filler, which effectively solves the problem of poor surface biocompatibility of traditional filter bed fillers.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", 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 any one or more embodiments or examples in a suitable manner.

[0087] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a filler having enhanced biocompatibility, characterized in that: The following steps are involved: The filler raw material is subjected to mechanical activation and screening to obtain a first filler, wherein the filler raw material is one or more of diatomaceous earth, volcanic rock, vermiculite, bentonite, feldspar, quartz, sepiolite, zeolite, dolomite, black talc, kaolin, montmorillonite, and apatite, and the filler raw material is subjected to grinding and screening in sequence to control the particle size of the first filler to be above 40 meshes; The first filler is cleaned with an organic acid solution, and the cleaned first filler is immersed in a surfactant, and the second filler is obtained after draining, wherein the organic acid solution comprises one or more of tartrate, oxalate, malate, citrate, ascorbate, and sodium alginate, and the organic acid content in the organic acid solution is 0.5% to 5%, and the surfactant is sodium lignin sulfonate, and the concentration of the surfactant is 0.1% to 1%; After the second filler is wrapped with a tie net, it is placed in a biological culture solution and aerated to obtain a third filler, wherein the diameter of the tie net is smaller than the particle size of the first filler, the biological culture solution includes 1g / L-10g / L of glucose, 0.5g / L-5g / L of ammonium salt, 0.2g / L-2g / L of calcium salt, 0.1g / L-1g / L of sodium salt, 0.05g / L-0.5g / L of potassium salt, 0.1g / L-1g / L of phosphate, and 0.5g / L-5g / L of sulfate, and the temperature of the biological culture solution is 20°C-35°C, and the pH value is 6.5-8, and the tie net is placed in the biological culture solution by hanging or supporting the chassis; The third filler is air-dried under natural conditions to obtain a target filler with enhanced biocompatibility.

2. The method for preparing a filler with enhanced biocompatibility according to claim 1, characterized in that: In the step of soaking the cleaned first filler in a surfactant, the soaking time is 10s to 90s.

3. A filler for enhancing biocompatibility, characterized in that: The filler with enhanced biocompatibility is prepared according to the preparation method of any one of claims 1-2.

4. Application of a filler with enhanced biocompatibility in sewage treatment, characterized in that: A filler with enhanced biocompatibility is prepared by the method for preparing a filler with enhanced biocompatibility according to any one of claims 1 to 2, and the filler with enhanced biocompatibility is filled into a filter bed.

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