Preparation method of suspended filler applied to EGA sewage biological treatment

Abstract

The application discloses a preparation method of a suspended filler applied to EGA sewage biological treatment and belongs to the technical field of biological fillers. The suspended filler comprises modified polyethylene, dolomite, activated carbon, an ultraviolet absorbent and a water-soluble polymer, nano-silver / quercetin solution is used as core material, N-vinyl pyrrolidone is used as wall material, modified silver microcapsules are prepared through in-situ polymerization reaction, high-density polyethylene is subjected to plasma modification, and then grafted with the modified silver microcapsules to obtain modified polyethylene; polyethylene glycol diallyl ether monomer and acrylic acid monomer are grafted and copolymerized to obtain the water-soluble polymer, so that the hydrophilicity of the suspended filler is improved. The suspended filler prepared by the application has the advantages of strong microbial adsorption capacity, high hydrophilicity and strong mechanical force, and the geometric configuration of the designed suspended filler can improve the accommodation capacity for microorganisms.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of biological filler, and particularly relates to a preparation method of a suspended filler applied to EGA sewage biological treatment. BACKGROUND

[0002] With the rapid development of economy and the continuous increase of urban population in China, the sewage discharge amount continuously increases, and the untreated sewage directly discharged into water bodies will lead to the deterioration of water quality, the increasing shortage of domestic water and industrial water, and water pollution will become a major obstacle to the sustainable development of China.

[0003] The EGA sewage treatment technology is mainly based on the biological membrane method and the moving bed biological membrane reactor process, the suspended filler with a density close to water is added into the activated sludge, the microorganisms are attached to the surface of the filler to form a biological membrane, the filler is always in a fluidized state through aeration, stirring and other actions, is uniformly mixed with the sewage and fully contacts with the pollutants, and finally the pollutants are oxidized and decomposed through the biological membrane to achieve the purpose of purifying the sewage.

[0004] Among them, the polyethylene filler has the advantages of small density, large specific surface area and good microbial adhesion, and is particularly suitable as a carrier of the suspended filler, but the filler represented by polyethylene has the shortcomings of poor biological affinity and hydrophilicity, which easily causes the surface of the biological membrane support to be wet and the mass transfer performance to be not ideal.

[0005] The patent application CN101628758A discloses a modified PVC biological filler, which is toughened by using polyacrylate to polyvinyl chloride to improve the impact resistance of itself, but the hydrophilicity and microbial adsorption performance of polyvinyl chloride are poor, which is not conducive to biological membrane formation, and how to improve the hydrophilicity and microbial adsorption capacity while maintaining the high mechanical properties of polyvinyl chloride is still a technical problem to be solved.

[0006] In view of the technical defects, a solution is proposed. SUMMARY

[0007] The application aims to provide a preparation method of a suspended filler applied to EGA sewage biological treatment, and aims to solve the technical problems of the suspended filler prepared by using polyethylene as a skeleton material in the prior art, such as poor hydrophilicity and poor microbial adsorption capacity.

[0008] The purpose of the application can be achieved by the following technical scheme: a preparation method of a suspended filler applied to EGA sewage biological treatment, comprising the following steps:

[0009] S1, mixing modified polyethylene, dolomite, activated carbon, ultraviolet absorber and water-soluble polymer, and then adding them into an extruder to extrude, to obtain a suspended filler formula;

[0010] S2, the suspended filler formula is extruded into a shape, and vacuum setting is performed at a vacuum degree of 3-6*10 4 Pa is vacuum set, and water cooling is performed, thereby obtaining the suspended filler for EGA sewage biological treatment.

[0011] Further, the modified polyethylene, dolomite, activated carbon, ultraviolet absorber and water-soluble polymer are used in a ratio of 50-60:1-5:1-3:0.5-1:1-10 by weight.

[0012] Further, the preparation method of the modified polyethylene comprises the following steps:

[0013] A1, quercetin is dissolved in anhydrous ethanol to obtain a mixed solution; the mixed solution is diluted with anhydrous ethanol to obtain a 1g / L quercetin solution; the quercetin solution and the nano-silver powder are mixed and ultrasonicated to obtain a nano-silver / quercetin solution;

[0014] A2, the Span 80, Tween-80 and ethanol are mixed and stirred until completely dissolved to obtain an emulsifier; the emulsifier is added dropwise to the nano-silver / quercetin solution at a rate of 1mL / min, and emulsified by using a homogenizing emulsifier to obtain a core material emulsion;

[0015] A3, azobisisobutyronitrile is added to the core material emulsion; N-vinylpyrrolidone is added dropwise to triethanolamine to adjust the pH value of the N-vinylpyrrolidone to 8-9; then the N-vinylpyrrolidone is added dropwise to the core material emulsion to obtain a mixed emulsion; the pH value of the mixed emulsion is adjusted to 2.5-3 by using 0.1mol / L hydrochloric acid, and then reacted at 30-40℃ for 2-3h in a water bath, and finally treated by post-processing to obtain modified silver microcapsules;

[0016] The Span 80 and Tween-80 are mixed and dissolved in ethanol to obtain an emulsion, and then the core material nano-silver / quercetin solution is added to the emulsion for secondary emulsification to obtain a core material emulsion; by using an in-situ polymerization method, the core material nano-silver / quercetin solution is used as a dispersed phase, azobisisobutyronitrile is used as a peroxide initiator for polymerization, and the wall material liquid droplets of N-vinylpyrrolidone are added to the dispersed phase core material to realize polymerization; when the prepolymer is polymerized, the size of the prepolymer gradually increases and is deposited on the surface of the core material; due to the continuous polymerization, the poly-N-vinylpyrrolidone finally becomes the microcapsule shell of the core material.

[0017] A4, the high-density polyethylene is treated by using a DBD plasma experiment device to obtain treated high-density polyethylene; the modified silver microcapsules and deionized water are mixed uniformly to obtain a modified silver microcapsule solution; the treated high-density polyethylene is immersed in the modified silver microcapsule solution for 1-3h, then taken out and dried to constant weight to obtain modified polyethylene.

[0018] The high-density polyethylene is treated by the plasma experiment equipment, a large number of active free radicals are generated on the surface of the high-density polyethylene, and the active free radicals can be reacted with poly N-vinyl pyrrolidone on the surface of the modified silver microcapsule to obtain modified polyethylene with the surface grafted with the modified silver microcapsule.

[0019] Further, in step A1, the amount of quercetin is 0.302 g, the ratio of the amount of the quercetin solution to the amount of the silver nanopowder is 100 mL:0.1-0.5 g, the ultrasonic time is 1-2 h, the ultrasonic temperature is 60 DEG C, and the ultrasonic power is 100-200 W.

[0020] Further, in step A2, the ratio of the amount of the Span 80, the Tween-80 and the ethanol is 0.3-0.5 g:0.1-0.2 g:3-5 mL, the ratio of the amount of the emulsifier to the amount of the silver nanopowder / quercetin solution is 3-5 mL:10 mL, the emulsification temperature of the homogenizing emulsifier is 65-75 DEG C, the emulsification rotation speed is 10000-20000 r / min, and the emulsification time is 20-30 min, in step A3, the ratio of the amount of the N-vinyl pyrrolidone, the core material emulsion and the azobisisobutyronitrile is 50 mL:40-50 mL:0.1-0.3 g.

[0021] Further, in step A3, the post-process treatment comprises: standing and naturally cooling for three days to obtain a mixture, and then using distilled water and ethanol to flush the uncoated wall material and core material in the mixture in a vacuum filter, and then drying the mixture in a vacuum oven at 60 DEG C until the weight is constant to obtain the modified silver microcapsule.

[0022] Further, in step A4, the treatment voltage is 50 V, the treatment current is 1.0+ / -0.05 A, the treatment time is 60-90 s, the ratio of the amount of the modified silver microcapsule to the amount of the deionized water is 10-20 g:100 mL, and the solid-liquid ratio of the treated high-density polyethylene to the modified silver microcapsule solution is 1:3-5.

[0023] Further, the preparation method of the water-soluble high polymer comprises the following steps:

[0024] B1, acrylic acid and deionized water are added into a reaction kettle, the reaction kettle is heated to 70-90 DEG C, and then polyethylene glycol diallyl ether is uniformly added into the reaction kettle at a constant speed;

[0025] B2, 70-80 wt% of an ammonium persulfate aqueous solution is added into the reaction kettle in a fine stream, the reaction kettle is maintained at 70-90 DEG C and closed for reaction for 30-60 min, then the reaction kettle is naturally cooled, the temperature is reduced to 50-55 DEG C, and then a 0.1 mol / L NaOH aqueous solution is used to adjust the pH value of the reaction kettle to 6.5-7 to obtain the water-soluble high polymer.

[0026] The high polymer is obtained by polyaddition reaction of acrylic monomer and polyethylene glycol diallyl ether in a reaction kettle as a closed system and ammonium persulfate as an initiator.

[0027] The reaction formula of acrylic acid and polyethylene glycol diallyl ether is as follows:

[0028]

[0029] Further, in step B1, the usage ratio of acrylic acid, deionized water and polyethylene glycol diallyl ether is 25g:50mL:40-80g, and the total dropping time of polyethylene glycol diallyl ether is 100-120min; in step B2, the usage amount of ammonium persulfate aqueous solution is 3-5mL.

[0030] The present application has the following advantages:

[0031] 1. The prepared suspended filler has a cylindrical geometry, and has multiple layers of porous structure from inside to outside, and has a large specific surface area, which can increase the capacity of accommodating microorganisms, and the nano Ag has excellent microorganism adsorption capacity, and the Ag can react with HS - , S 2- ions in sewage to form Ag2S through shape transformation; in addition, the Ag itself has a strong inhibitory and killing effect on various pathogenic microorganisms, and the particle size of the nano Ag is in the range of 1-100nm, and as a new type of material between the crystalline and amorphous states, when the particle size of the nano Ag reaches the nanometer level, the specific surface area increases by orders of magnitude, however, the nano Ag in the natural environment is affected by light, pH, free radicals and other factors, and is deactivated, and the quercetin as a flavonoid compound can actively chelate metal ions and reduce the oxidized nano silver, thereby improving the reducibility and stability of the prepared nano silver, and the modified silver microcapsule is prepared by using the nano silver / quercetin solution as the core material and N-vinyl pyrrolidone as the wall material, and in-situ polymerization occurs in the core material emulsion.

[0032] 2. In order to improve the mechanical properties of the prepared suspended filler, the present application uses high-density polyethylene as the skeleton of the suspended filler, and the high-density polyethylene as the high polymer has excellent mechanical properties, but has the problems of poor bioaffinity and poor adhesion, and the present application uses plasma technology to modify the high-density polyethylene, and the plasma modification technology has high energy density, can initiate physical and chemical reaction processes that are difficult to initiate under normal conditions, and the modification only occurs on the surface layer, and the internal structure of the material still maintains the original performance, and the modified silver microcapsule is grafted on the surface of the high-density polyethylene through a free radical polymerization reaction, thereby improving the bioaffinity and microbial adhesion strength of the modified silver microcapsule.

[0033] 3. To further improve the hydrophilicity of the suspended packing, this invention adds a certain amount of water-soluble polymer to the prepared suspended packing. The polymer is prepared by graft copolymerization of polyethylene glycol diallyl ether monomer and acrylic acid monomer. Furthermore, as a carrier, the biological packing must possess sufficient mechanical strength to overcome hydraulic shearing of varying intensities and rolling friction between packing materials. Therefore, a certain amount of dolomite, an inorganic material, is added to the prepared suspended packing formulation. Dolomite is a complex salt composed of calcium carbonate and magnesium carbonate, containing a certain amount of mica, quartz, iron-containing minerals, and other impurities. Adding a certain amount of dolomite can improve the mechanical strength of the biological packing. Activated packing needs to possess a certain porosity to increase the effective contact area between the carrier and microorganisms. Therefore, a certain amount of activated carbon is added to the prepared suspended packing. The above raw material components are then processed through extrusion, vacuum molding, water cooling, and other post-processing techniques to prepare a suspended packing material applicable to EGA wastewater biological treatment. Detailed Implementation

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] This embodiment provides a method for preparing modified polyethylene for use as a suspended packing material in EGA wastewater biological treatment, including the following steps:

[0037] A1. Accurately weigh 0.300 g of quercetin into a 50 mL beaker using an electronic balance, then add anhydrous ethanol to completely dissolve it, obtaining a mixed solution. Transfer the entire mixed solution to a 150 mL volumetric flask and dilute to volume with anhydrous ethanol to prepare 100 mL of a 1 g / L quercetin solution. Add 100 mL of the 1 g / L quercetin solution and 0.1 g of nano-silver powder to a 50 mL beaker. Transfer the beaker to an ultrasonic machine and react for 1 hour. Set the ultrasonic machine temperature to 60℃ and the power to 200 W to obtain a nano-silver / quercetin solution.

[0038] A2. Add 0.3g of Span 80, 0.1g of Tween-80, and 3mL of ethanol to a beaker and stir with a glass rod until completely dissolved to obtain an emulsifier. Add 3mL of the emulsifier dropwise to 10mL of nano-silver / quercetin solution and emulsify using a homogenizer at 65℃ and 10000r / min for 20min to obtain the core material emulsion.

[0039] A3, 200 mL of N-vinylpyrrolidone is added dropwise with triethanolamine to adjust the pH value of N-vinylpyrrolidone to 8; 40 mL of core material emulsion is added with 0.1-0.3 g of azobisisobutyronitrile, and then N-vinylpyrrolidone is added dropwise into the above core material emulsion by using a rubber head dropper to obtain a mixed emulsion; the pH value of the mixed emulsion is adjusted to 2.5 with 0.1 mol / L hydrochloric acid, and then the mixed emulsion is reacted at 30°C for 2 h on a water bath, and is naturally cooled for three days to obtain a mixture. The uncoated wall material and core material in the mixture are washed with distilled water and ethanol in a vacuum filter in sequence, and then the mixture is dried in an oven at 60°C to a constant weight to obtain modified silver microcapsules.

[0040] A4, high-density polyethylene is placed on a DBD plasma experiment device for treatment, the voltage is 50 V, the current is 1.0 A, and the treatment time is 60 s to obtain treated high-density polyethylene. 10 g of modified silver microcapsules and 100 mL of deionized water are uniformly mixed to obtain a high-concentration modified silver microcapsule solution; then the treated high-density polyethylene is immersed in the nano-silver microcapsule solution for 1 h, the solid-liquid ratio is 1:3, and then the solid is taken out to obtain a solid; the solid is dried at 70°C to a constant weight to obtain modified polyethylene.

[0041] Example 2

[0042] The present embodiment provides a preparation method of modified polyethylene for suspended fillers applied to EGA sewage biological treatment, comprising the following steps:

[0043] A1, 0.301 g of quercetin is accurately weighed by using an electronic balance in a 50 mL small beaker, and then anhydrous ethanol is added to completely dissolve the quercetin to obtain a mixed solution. The mixed solution is completely transferred to a 150 mL volumetric flask, and anhydrous ethanol is used for constant volume to prepare 100 mL of 1 g / L quercetin solution. 100 mL of 1 g / L quercetin solution and 0.3 g of nano-silver powder are added to a 50 mL beaker, and then the beaker is transferred to an ultrasonic machine for reaction for 1.5 h, the temperature of the ultrasonic machine is set to 60°C, and the power of the ultrasonic machine is 150 W to obtain a nano-silver / quercetin solution.

[0044] A2, 0.4 g of Span 80, 0.15 g of Tween-80 and 4 mL of ethanol are added to a beaker, and then stirred with a glass rod until completely dissolved to obtain an emulsifier. 4 mL of the emulsifier is added dropwise into 10 mL of the nano-silver / quercetin solution, and then emulsified at 70°C for 25 min by using a homogenizing emulsifier at a speed of 15000 r / min to obtain a core material emulsion.

[0045] A3, 200 mL of N-vinylpyrrolidone was added dropwise with triethanolamine, and the pH value of the N-vinylpyrrolidone was adjusted to 8.3; 46 mL of core material emulsion was added with 0.2 g of azobisisobutyronitrile, and then the N-vinylpyrrolidone was added dropwise into the above core material emulsion by using a rubber head dropper, to obtain a mixed emulsion; the pH value of the mixed emulsion was adjusted to 2.8 with 0.1 mol / L hydrochloric acid, and then the mixed emulsion was reacted in a water bath pot at 35°C for 2.3 h, and was naturally cooled for three days after standing, to obtain a mixture. The uncoated wall material and core material in the mixture were washed with distilled water and ethanol in a vacuum filter machine in sequence, and then the mixture was dried in an oven at 60°C until the weight was constant, to obtain modified silver microcapsules.

[0046] A4, the high-density polyethylene was placed on a DBD plasma experiment device for treatment, with a voltage of 50 V and a current of 1.02 A, and the treatment time was 80 s, to obtain treated high-density polyethylene. 15 g of modified silver microcapsules and 100 mL of deionized water were uniformly mixed to obtain a high-concentration modified silver microcapsule solution; then the treated high-density polyethylene was immersed in the nano-silver microcapsule solution for 2 h, with a solid-liquid ratio of 1:4, and then taken out, to obtain a solid; the solid was dried at 75°C until the weight was constant, to obtain modified polyethylene.

[0047] Example 3

[0048] The present embodiment provides a preparation method of modified polyethylene for suspended fillers applied to EGA sewage biological treatment, comprising the following steps:

[0049] A1, 0.302 g of quercetin was accurately weighed by using an electronic balance in a 50 mL small beaker, and then anhydrous ethanol was added to completely dissolve the quercetin, to obtain a mixed solution. The mixed solution was completely transferred to a 150 mL volumetric flask, and anhydrous ethanol was used for constant volume, to obtain 100 mL of 1 g / L quercetin solution. 100 mL of 1 g / L quercetin solution and 0.5 g of nano-silver powder were added into a 50 mL beaker, and then the beaker was transferred to an ultrasonic machine for reaction for 2 h, with the temperature of the ultrasonic machine set to 60°C and the power of the ultrasonic machine set to 200 W, to obtain a nano-silver / quercetin solution.

[0050] A2, 0.5 g of Span 80, 0.2 g of Tween-80 and 5 mL of ethanol were added into a beaker, and then stirred with a glass rod until completely dissolved, to obtain an emulsifier. 5 mL of the emulsifier was added dropwise into 10 mL of the nano-silver / quercetin solution, and then emulsified at 75°C for 20-30 min by using a homogenizing emulsifier at a speed of 20000 r / min, to obtain a core material emulsion.

[0051] A3, 200 mL of N-vinylpyrrolidone is added dropwise with triethanolamine to adjust the pH value of N-vinylpyrrolidone to 9; 0.3 g of azobisisobutyronitrile is added to 50 mL of core material emulsion, and then N-vinylpyrrolidone is added dropwise to the 50 mL of core material emulsion using a rubber head dropper to obtain a mixed emulsion; the pH value of the mixed emulsion is adjusted to 3 with 0.1 mol / L hydrochloric acid, and then the mixed emulsion is reacted at 40°C for 3 h in a water bath, and then is naturally cooled for three days to obtain a mixture. The uncoated wall material and core material in the mixture are washed with distilled water and ethanol in a vacuum filter, and then the mixture is dried in an oven at 60°C to a constant weight to obtain modified silver microcapsules.

[0052] A4, high-density polyethylene is placed on a DBD plasma experimental device for treatment, the voltage is 50 V, the current is 1.05 A, and the treatment time is 690 s to obtain treated high-density polyethylene. 20 g of modified silver microcapsules and 100 mL of deionized water are uniformly mixed to obtain a high-concentration modified silver microcapsule solution; then the treated high-density polyethylene is immersed in the nano-silver microcapsule solution for 3 h, the solid-liquid ratio is 1:5, and then the solid is taken out to obtain a solid; the solid is dried at 80°C to a constant weight to obtain modified polyethylene.

[0053] Example 4

[0054] The embodiment provides a preparation method of a water-soluble polymer for a suspended filler applied to EGA sewage biological treatment, and the method comprises the following steps:

[0055] B1, 25 g of acrylic acid and 100 mL of deionized water are added to a 250 mL laboratory reaction kettle, and then the reaction kettle is heated to 70°C; then 40 g of polyethylene glycol diallyl ether monomer is added dropwise to the reaction kettle at a constant speed, and the total dropwise adding time is controlled to be 100 min.

[0056] B2, 3 mL of 70%wt ammonium persulfate aqueous solution is configured; then the 70%wt ammonium persulfate aqueous solution is added to the reaction kettle in a fine stream, the reaction kettle is maintained at 70°C and is closed for reaction for 30 min, and then is naturally cooled to 50°C; then the pH value of the reaction kettle is adjusted to 6.5 with 0.1 mol / L NaOH aqueous solution to prepare a water-soluble polymer.

[0057] Example 5

[0058] The embodiment provides a preparation method of a water-soluble polymer for a suspended filler applied to EGA sewage biological treatment, and the method comprises the following steps:

[0059] B1, 25 g of acrylic acid and 100 mL of deionized water were added into a 250 mL laboratory reaction kettle, then the reaction kettle was heated to 70℃, and then 40 g of polyethylene glycol diallyl ether monomer was added dropwise at a constant speed, and the total dropwise time was controlled to be 100 min.

[0060] B2, 3 mL of 70%wt ammonium persulfate aqueous solution was prepared; then the 70%wt ammonium persulfate aqueous solution was added into the reaction kettle in a fine stream, and the reaction kettle was maintained at 70℃ for 30 min, then it was naturally cooled to 50℃, and then the pH value of the reaction kettle was adjusted to 6.5 by using 0.1 mol / L NaOH aqueous solution, so as to prepare a water-soluble polymer.

[0061] Example 6

[0062] The embodiment provides a preparation method of a water-soluble polymer for a suspended filler applied to EGA sewage biological treatment, and the method comprises the following steps:

[0063] B1, 25 g of acrylic acid and 100 mL of deionized water were added into a 250 mL laboratory reaction kettle, then the reaction kettle was heated to 80℃, and then 60 g of polyethylene glycol diallyl ether monomer was added dropwise at a constant speed, and the total dropwise time was controlled to be 110 min.

[0064] B2, 4 mL of 75%wt ammonium persulfate aqueous solution was prepared; then the 75%wt ammonium persulfate aqueous solution was added into the reaction kettle in a fine stream, and the reaction kettle was maintained at 80℃ for 50 min, then it was naturally cooled to 52℃, and then the pH value of the reaction kettle was adjusted to 6.8 by using 0.1 mol / L NaOH aqueous solution, so as to prepare a water-soluble polymer.

[0065] Example 7

[0066] The embodiment provides a preparation method of a suspended filler applied to EGA sewage biological treatment, and the method comprises the following steps:

[0067] S1, according to the weight part, 50 parts of the modified polyethylene prepared in Example 3, 1 part of dolomite, 1 part of activated carbon, 0.5 part of ultraviolet absorber and 1 part of the water-soluble polymer prepared in Example 6 were added into a mixer and mixed, and then were added into an extruder, and the temperature of the extruder was set to be 170℃, so as to obtain a suspended filler formula.

[0068] S2, the suspended filler formula was added into a mold and extruded into a shape, the geometric configuration of the suspended filler was a cylinder, and there were four layers of hole structures from inside to outside, the central hole was a regular pentagon, and the outer circle hole was a trapezoid; then the suspended filler was placed in a vacuum degree of 3x10 4The modified polyethylene prepared in Example 3, 55 parts by weight; dolomite, 2 parts by weight; activated carbon, 2 parts by weight; ultraviolet absorber, 0.8 parts by weight; and the water-soluble polymer prepared in Example 6, 5 parts by weight, are mixed in a blender, and then extruded in an extruder, with the temperature of the extruder set at 175°C, to obtain a suspension filler formula.

[0069] Example 8

[0070] The present example provides a method for preparing a suspension filler for EGA sewage biological treatment, comprising the following steps:

[0071] S1, the modified polyethylene prepared in Example 3, 55 parts by weight; dolomite, 2 parts by weight; activated carbon, 2 parts by weight; ultraviolet absorber, 0.8 parts by weight; and the water-soluble polymer prepared in Example 6, 5 parts by weight, are mixed in a blender, and then extruded in an extruder, with the temperature of the extruder set at 175°C, to obtain a suspension filler formula.

[0072] S2, the suspension filler formula is extruded in a mold, and the geometric configuration of the suspension filler is a cylinder, which has four layers of hole-like structures from the inside to the outside, with the central hole being a regular pentagon and the outer ring hole being a trapezoid; then the suspension filler Pa is shaped in a vacuum degree of 5x10 4 The modified polyethylene prepared in Example 3, 55 parts by weight; dolomite, 2 parts by weight; activated carbon, 2 parts by weight; ultraviolet absorber, 0.8 parts by weight; and the water-soluble polymer prepared in Example 6, 5 parts by weight, are mixed in a blender, and then extruded in an extruder, with the temperature of the extruder set at 175°C, to obtain a suspension filler formula.

[0073] Example 9

[0074] The present example provides a method for preparing a suspension filler for EGA sewage biological treatment, comprising the following steps:

[0075] S1, the modified polyethylene prepared in Example 3, 55 parts by weight; dolomite, 2 parts by weight; activated carbon, 2 parts by weight; ultraviolet absorber, 0.8 parts by weight; and the water-soluble polymer prepared in Example 6, 5 parts by weight, are mixed in a blender, and then extruded in an extruder, with the temperature of the extruder set at 175°C, to obtain a suspension filler formula.

[0076] S2, the suspension filler formula is extruded in a mold, and the geometric configuration of the suspension filler is a cylinder, which has four layers of hole-like structures from the inside to the outside, with the central hole being a regular pentagon and the outer ring hole being a trapezoid; then the suspension filler Pa is shaped in a vacuum degree of 5x10 4 The modified polyethylene prepared in Example 3, 55 parts by weight; dolomite, 2 parts by weight; activated carbon, 2 parts by weight; ultraviolet absorber, 0.8 parts by weight; and the water-soluble polymer prepared in Example 6, 5 parts by weight, are mixed in a blender, and then extruded in an extruder, with the temperature of the extruder set at 175°C, to obtain a suspension filler formula.

[0077] Comparative Example 1

[0078] The difference between the present comparative example and Example 9 is that, when preparing the modified silver microcapsule, the nanosilver solution is replaced by the nanosilver / quercetin solution as the core material.

[0079] Comparative Example 2

[0080] The difference between this comparative example and Example 9 is that the modified polyethylene is replaced with the same mass of high-density polyethylene.

[0081] Comparative Example 3

[0082] The difference between this comparative example and Example 9 is that no water-soluble polymer was added when preparing the suspension filler formulation.

[0083] Performance testing:

[0084] 1. The contact angles of the suspended packings prepared in Examples 7-9 and Comparative Examples 1-3 were measured using a JC-2000C contact angle measuring instrument. The test solution was double-distilled water, and the test temperature was 24℃. Each sample was tested five times, and the average contact angle was calculated.

[0085] 2. In accordance with GB / T1040-2006 "Determination of tensile properties of plastics", the tensile strength of the suspension fillers prepared in Examples 7-9 and Comparative Examples 1-3 was tested using a material testing machine. The test temperature was 23℃ and the humidity was 55%wt.

[0086] 3. The suspended packing materials prepared in Examples 7-9 and Comparative Examples 1-3 for the biological treatment of EGA wastewater were applied in a wastewater treatment plant. First, the concentrations of COD, BOD, and TN in the effluent from the primary sedimentation tank of the wastewater treatment plant were measured. Then, an activated sludge biofilm method was used to conduct a reactor start-up test. The concentrations of COD, BOD, and TN in the wastewater were measured, and the corresponding conversion rates were calculated. Specific test results are shown in Table 1.

[0087] Table 1 - Sample Performance Test Data

[0088]

[0089] Data Analysis:

[0090] By comparing and analyzing the data in Table 1, it can be seen that the suspended packing materials prepared in Examples 7-9 of this invention for the biological treatment of EGA wastewater are all hydrophilic, and the water contact angle is much less than 90°. However, in Comparative Example 2, the use of high-density polyethylene instead of modified polyethylene reduces the hydrophilicity of the prepared suspended packing material and increases the water contact angle. In Comparative Example 3, the absence of a highly hydrophilic water-soluble polymer reduces the hydrophilicity of the prepared suspended packing material and increases the water contact angle.

[0091] According to Comparative Example 2, both the suspended filler prepared with modified polyethylene as the skeleton and the suspended filler prepared with high-density polyethylene as the skeleton have excellent tensile strength, indicating that the modification treatment has little impact on the mechanical properties of high-density polyethylene.

[0092] According to the comparative example 1, since the nano-silver solution is used instead of the nano-silver / quercetin solution as the core material when preparing the modified silver microcapsule, the microbial adsorption capacity of the prepared suspended filler is reduced, which is manifested as the significant decrease of the COD removal rate and the BOD removal rate.

[0093] The above is only an example and description of the structure of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace, as long as the modifications or supplements do not deviate from the structure of the present application or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

[0094] In the description of the present specification, the description referring to the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0095] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details and limit the present application to the specific embodiments. Obviously, many modifications and changes can be made according to the content of the present specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is only limited by the claims and their entire scope and equivalents.

Claims

1. A method for preparing suspended packing material for biological treatment of EGA wastewater, characterized in that, Includes the following steps: S1. Modified polyethylene, dolomite, activated carbon, ultraviolet absorber and water-soluble polymer are mixed and then extruded in an extruder to obtain a suspension filler formulation. S2. Extrude the suspended filler formulation into shape under a vacuum of 3-6×10⁻⁶. 4 The Pa is shaped by vacuum shaping sleeve and then water-cooled to become a suspended packing material used in EGA wastewater biological treatment. The method for preparing the modified polyethylene includes the following steps: A1. Quercetin was dissolved in anhydrous ethanol to obtain a mixed solution; the mixed solution was diluted with anhydrous ethanol to prepare a 1 g / L quercetin solution; the quercetin solution and nano silver powder were mixed and sonicated to obtain a nano silver / quercetin solution. A2. Mix Span 80, Tween-80 and ethanol and stir until completely dissolved to obtain an emulsifier; add the emulsifier dropwise to the nano silver / quercetin solution at 1 mL / min and emulsify using a homogenizing emulsifier to obtain a core material emulsion; A3. Azobisisobutyronitrile (AIB) is added to the core material emulsion; triethanolamine is added dropwise to N-vinylpyrrolidone to adjust the pH of N-vinylpyrrolidone to 8-9; then N-vinylpyrrolidone is added dropwise to the core material emulsion to obtain a mixed emulsion; the pH of the mixed emulsion is adjusted to 2.5-3 using 0.1 mol / L hydrochloric acid, and then reacted in a water bath at 30-40℃ for 2-3 hours. After post-processing, modified silver microcapsules are obtained. A4. High-density polyethylene was treated in a DBD plasma experimental device to obtain treated high-density polyethylene; modified silver microcapsules and deionized water were mixed evenly to obtain a modified silver microcapsule solution; the treated high-density polyethylene was immersed in the modified silver microcapsule solution for 1-3 hours, then removed and dried to constant weight to obtain modified polyethylene.

2. The method for preparing suspended packing material for biological treatment of EGA wastewater according to claim 1, characterized in that, The ratio of the modified polyethylene, dolomite, activated carbon, ultraviolet absorber and water-soluble polymer by weight is 50-60:1-5:1-3:0.5-1:1-10; the temperature of the extruder is set to 170-180℃.

3. The method for preparing suspended packing material for biological treatment of EGA wastewater according to claim 1, characterized in that, In step A1, the amount of quercetin used is 0.302g, and the ratio of quercetin solution to nano silver powder is 100mL:0.1-0.5g; the ultrasonic duration is 1-2h, the ultrasonic temperature is 60℃, and the ultrasonic power is 100-200W.

4. The method for preparing suspended packing material for biological treatment of EGA wastewater according to claim 1, characterized in that, In step A2, the ratio of Span 80, Tween-80, and ethanol is 0.3-0.5g:0.1-0.2g:3-5mL; the ratio of emulsifier to nano-silver / quercetin solution is 3-5mL:10mL; the emulsification temperature of the homogenizer is 65-75℃, the emulsification speed is 10000-20000r / min, and the emulsification time is 20-30min; in step A3, the ratio of N-vinylpyrrolidone, core material emulsion, and azobisisobutyronitrile is 50mL:40-50mL:0.1-0.3g.

5. The method for preparing suspended packing material for biological treatment of EGA wastewater according to claim 1, characterized in that, In step A3, the post-processing includes: allowing the mixture to stand and cool naturally for three days to obtain a mixture; rinsing the uncoated wall material and core material in the mixture sequentially with distilled water and ethanol in a vacuum filter, and then drying it to constant weight in a vacuum oven at 60°C to obtain modified silver microcapsules.

6. The method for preparing suspended packing material for biological treatment of EGA wastewater according to claim 1, characterized in that, In step A4, the processing voltage is 50V, the processing current is 1.0±0.05A, and the processing time is 60-90s; the ratio of modified silver microcapsules to deionized water is 10-20g:100mL; and the solid-liquid ratio of the treated high-density polyethylene and modified silver microcapsule solution is 1:3-5.

7. The method for preparing suspended packing material for biological treatment of EGA wastewater according to claim 1, characterized in that, The method for preparing the water-soluble polymer includes the following steps: B1. Add acrylic acid and deionized water to the reactor, then heat the reactor to 70-90℃, and then add polyethylene glycol diallyl ether dropwise to the reactor at a uniform rate. B2. Add 70-80%wt ammonium persulfate aqueous solution to the reactor in a thin stream. Maintain the reactor at 70-90℃ and seal it for 30-60 minutes. Then, allow the reactor to cool naturally to 50-55℃. Adjust the pH of the reactor to 6.5-7 with 0.1mol / L NaOH aqueous solution to obtain the water-soluble polymer.

8. The method for preparing suspended packing material for biological treatment of EGA wastewater according to claim 7, characterized in that, In step B1, the ratio of acrylic acid, deionized water, and polyethylene glycol diallyl ether is 25g:50mL:40-80g, and the total dripping time of polyethylene glycol diallyl ether is 100-120min; in step B2, the amount of ammonium persulfate aqueous solution used is 3-5mL.

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