A method and system for preparing fillers using aluminum sludge and kitchen waste

Abstract

The present invention discloses a preparation system for preparing fillers by using aluminum sludge and kitchen waste, including a mixing treatment device for aluminum sludge and kitchen waste, a stirring device, a centrifuge device, a drying device, and a granulating device. The mixing treatment device includes a material regulating tank, an anaerobic digestion reactor, a solid-liquid separation reactor, a drying box, a desulfurization system, an equipment power supply, and a biogas generating set. The present invention also discloses a method for preparing fillers by using aluminum sludge and kitchen waste. The present invention can not only improve the nitrogen and phosphorus removal efficiency of aluminum sludge and reduce secondary pollution, but also take into account the resource utilization of kitchen waste.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment filler preparation and kitchen waste resource utilization, and in particular to a method and system for preparing filler by utilizing aluminum sludge and kitchen waste. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Aluminum sludge from water plants (Al-WTR) has the characteristics of well-developed pores, large specific surface area, and contains a large amount of aluminum oxide compounds. It has the potential to be a cheap and efficient adsorbent. Using water plant sludge as an adsorbent to remove heavy metals can not only control problems such as heavy metal pollution in the water and soil environment, but also turn water plant sludge solids into treasure and solve the problem of sludge disposal. At the same time, in China's current domestic waste, kitchen waste accounts for 59.3%, which is the main component of domestic waste. Kitchen waste contains about 20% organic solids. Kitchen waste has a material basis for resource utilization and can be used as an organic filler for denitrification and phosphorus removal in the field of water treatment.

[0004] Paragraphs

[0007] to

[0015] of the Chinese patent specification with the application number "2021111748459" disclose "a modified aluminum sludge phosphorus removal filler, which includes a composite inorganic material. The composite inorganic material includes aluminum sludge, clay, and steel slag powder. Further preferably: it also includes an organic-inorganic composite binder, and the organic-inorganic composite binder is formed by grafting and copolymerizing organic monomers such as hydroxypropyl acrylate, acrylamide, sodium dodecylbenzenesulfonate, and propyltrimethoxysilane in a cement hydration environment to form an organic binder and then compounding it with an inorganic binder to form a hydrophilic composite binder. Further preferably: the weight parts of each component in the organic binder formed by grafting and copolymerizing are: 20 - 30 parts of monomer hydroxypropyl acrylate, 5 - 12 parts of acrylamide, 1 - 6 parts of sodium dodecylbenzenesulfonate; 1 - 5 parts of propyltrimethoxysilane, 25 - 40 parts of water, and 25 - 50 parts of cement. Further preferably: the particle size of the modified aluminum sludge phosphorus removal filler is 8 - 20 mm. Further preferably: in the composite inorganic material, the weight parts of each component are as follows: 25 - 50 parts of aluminum sludge, 15 - 25 parts of clay, and 1 - 5 parts of steel slag powder; the steel slag powder is sieved through a 30-mesh sieve. Further preferably: the composite inorganic material is formed by mixing each component and adding water and stirring evenly, and the addition amount of water is 10 - 20% of the weight of the composite inorganic material." Acrylamide in this invention has strong neurotoxicity, and propyltrimethoxysilane is highly flammable and extremely toxic. Therefore, there are risks in the preparation operation, and the prepared filler is likely to cause secondary pollution to water bodies, and it does not play the role of "treating waste with waste" for aluminum sludge.

[0005] Paragraphs

[0008] to

[0020] of the Chinese patent specification with the application number "202011601792X" disclose "a method for rapid denitrification of municipal sewage by using kitchen waste fermentation liquid, which includes the following steps: S1: Take the original kitchen waste fermentation liquid, divide it into the first original liquid and the second original liquid, and adjust the pH value of the first original liquid to 7.0 - 8.5 to obtain the pretreated kitchen waste fermentation liquid; S2: Immerse the organic filler in the second original liquid, and the volume ratio of the organic filler to the second original liquid is 0.3 - 0.5 to obtain the pretreated organic filler; S3: Put the pretreated kitchen waste fermentation liquid in step S1 and the pretreated organic filler in step S2 into the sewage to be treated together to obtain the pretreated sewage; wherein, the volume ratio of the pretreated kitchen waste fermentation liquid to the sewage to be treated is 0.03 - 0.15, and the volume ratio of the pretreated organic filler to the sewage to be treated is 0.3 - 0.5; S4: Treat the pretreated sewage in step S3 according to the conventional biological treatment process and then discharge it. As a further solution of the present invention: the C / N ratio of the original kitchen waste fermentation liquid is 10 - 25. As a further solution of the present invention: the soaking temperature in step S2 is 20 - 30 °C, and the soaking time is 6 - 10 weeks. As a further solution of the present invention: the organic filler includes at least one of natural organic filler and synthetic organic filler. As a further solution of the present invention: the natural organic filler includes at least one of wood powder, sawdust, wood chips, cotton fiber, hemp fiber, coconut skin, bamboo, corn stalk, straw, wheat straw, and animal hair. As a further solution of the present invention: the synthetic organic filler includes at least one of nylon, polyester, acrylic, chloroprene, artificial regenerated fiber, rubber scraps, and synthetic resin. As a further solution of the present invention: the C / N ratio of the sewage to be treated in step S3 is 3 - 13. As a further solution of the present invention: the COD of the sewage to be treated in step S3 is 200 - 450 mg / L. As a further solution of the present invention: the conventional biological treatment process in step S4 is one of A / O water treatment process, A2 / O water treatment process, denitrifying deep bed filter process, and biological aerated filter process." The technical solution provided by the invention has a low denitrification efficiency for sewage by the conventional biological treatment process, and the organic filler will produce harmful substances and cause secondary pollution to the water body.

[0006] How to improve the denitrification and phosphorus removal efficiency of aluminum sludge, reduce secondary pollution, and be able to take into account the resource utilization of kitchen waste is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides a method and system for preparing fillers by using aluminum sludge and kitchen waste, which can not only improve the denitrification and phosphorus removal efficiency of aluminum sludge, reduce secondary pollution, but also take into account the resource utilization of kitchen waste.

[0008] The present invention is implemented by the following technical solutions:

[0009] A preparation method for preparing a filler by using aluminum sludge and kitchen waste, the specific steps are as follows:

[0010] Step S1. Perform pretreatment on kitchen waste, including solid-liquid separation, sorting, impurity removal, and wet sorting, to obtain kitchen waste slurry;

[0011] Step S2. Transport the kitchen waste slurry and aluminum sludge obtained in step S1 to a mixing treatment device, mix them with water to obtain a mixed slurry, and then obtain biogas residue after anaerobic digestion reaction, solid-liquid separation, and drying treatment;

[0012] Step S3. Mix the biogas residue obtained in step v2 with pyrite powder, limestone powder, and bentonite in a mass ratio of 1:3:1:1, and add water and stir to obtain a slurry;

[0013] Step S4. Centrifuge the slurry obtained in step S3 through a centrifuge device to remove the supernatant, and rinse the precipitate with deionized water until the supernatant is neutral;

[0014] Step S5. Dry the neutral precipitate obtained in step S4 and granulate it to obtain filler particles.

[0015] Further, the stirring rate in step S3 is 300 r / min, and the stirring time is 2 - 3 h.

[0016] Further, the rate of the centrifuge device in step S4 is 3000 r / min, and the centrifugation time is 15 min.

[0017] Further, the drying temperature in step S5 is 50°C - 90°C, and the time is 20 - 40 min.

[0018] A preparation system for preparing a filler by using aluminum sludge and kitchen waste, including a mixing treatment device, a stirring device, a centrifuge device, a drying device, and a granulating device for treating aluminum sludge and kitchen waste. The mixing treatment device includes:

[0019] A material adjustment tank for mixing aluminum sludge and pretreated kitchen waste materials with water to obtain a mixed slurry;

[0020] An anaerobic digestion reactor for performing anaerobic digestion reaction on the mixed slurry transported from the material adjustment tank;

[0021] A solid-liquid separation reactor for performing solid-liquid separation on the mixed slurry that has completed the anaerobic fermentation reaction;

[0022] A drying oven for drying the separated solid waste;

[0023] A desulfurization system for desulfurizing the biogas generated during the mixing process;

[0024] An equipment power supply for providing electrical energy to the above-mentioned devices of the mixing equipment;

[0025] A biogas generator set, electrically connected to the equipment power supply, for charging the equipment power supply with the electrical energy generated by burning the desulfurized combustible gas;

[0026] The top of the material adjustment tank is respectively connected with a feed pipe for transporting the pretreated food waste slurry, a water inlet pipe, and a conveying pipe for transporting aluminum sludge;

[0027] The solid-liquid separator includes a separator main body, a rotating barrel rotatably connected inside the separator main body, a rotating motor fixedly arranged on the upper part of the separator main body, and a biogas residue discharge device fixedly arranged on the lower part of the separator main body. An inlet is provided at the upper part of the separator main body. Separation holes are evenly distributed on the barrel wall of the rotating barrel for discharging the material liquid. The rotating barrel is inclined and arranged inside the separator main body. A rotating arm is fixedly connected along the side wall of the rotating barrel. The rotating motor is fixedly connected with the rotating arm, and the output end of the rotating motor rotates coaxially with the rotating barrel. A solid waste discharge port is provided at the bottom of the rotating barrel. The solid waste discharge port is rotatably connected with the separator main body through a bearing sleeve. The biogas residue discharge device is fixedly arranged on the separator main body through a pipeline, and the biogas residue discharge device corresponds to the position of the solid waste discharge port. The biogas residue discharge device includes a housing, a discharge motor fixedly arranged at one end of the housing, a rotating shaft fixedly connected to the output end of the discharge motor, a plurality of corrugated plates fixedly arranged on the rotating shaft, and a biogas residue discharge pipe. The biogas residue discharge pipe is detachably connected to the drying box;

[0028] A waste liquid discharge pipe is arranged at the relative position of the lower part of the separator main body and the biogas residue discharge device.

[0029] Further, the material adjustment tank, the anaerobic digestion reactor, and the solid-liquid separation reactor are sequentially connected through pipelines, and an electric valve body is installed on each pipeline. Exhaust pipelines are fixedly arranged on the upper parts of the side walls of the material adjustment tank, the anaerobic digestion reactor, the solid-liquid separation reactor, and the drying box. Each exhaust pipeline is connected to the inlet of the desulfurization system through a main pipeline. The desulfurization system is connected to the biogas generator set through a pipeline.

[0030] Further, the first hydraulic switch and the second hydraulic switch have the same structure, including a hydraulic rod and a baffle rotatably connected to the piston column of the hydraulic rod. The baffle of the first hydraulic switch is hinged to the extension pipe, and the baffle of the second hydraulic switch is hinged to the box body of the drying box.

[0031] Further, a time control switch is installed between the power device of the solid-liquid separation reactor and the equipment power supply, which is used to control the solid-liquid separation of the slurry by the solid-liquid separation reactor according to the preparation procedure; the drying oven is connected to the equipment power supply through a time control switch, which is used to control the drying operation time; the electric valve body is connected to the equipment power supply through a time control switch, which is used to control the discharge of the slurry to the next process equipment according to the preparation procedure.

[0032] Further, the waste liquid discharge pipe is connected with a reflux pipe, the other end of the reflux pipe communicates with the material adjustment tank, and a drain pipe is connected to the reflux pipe. A water stop valve is installed on the drain pipe to adjust the liquid level height of the material adjustment tank.

[0033] The beneficial effects of the present invention are as follows: Through the mixing treatment equipment, the pretreated kitchen waste and aluminum sludge are mixed and processed to obtain biogas residue as a filler for nitrogen and phosphorus removal. The organic components in the kitchen waste are used to improve the nitrogen and phosphorus removal efficiency of the aluminum sludge, reduce secondary pollution, and also give full play to the resource utilization effect of the kitchen waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a process block diagram of a method for preparing a filler using aluminum sludge and kitchen waste provided by the present invention;

[0035] Figure 2 It is an overall structural schematic diagram of the mixing treatment equipment provided by the present invention;

[0036] Figure 3 It is an overall structural schematic diagram of the solid-liquid separator provided by the present invention;

[0037] Figure 4 It is a cross-sectional structural schematic diagram of the solid-liquid separator provided by the present invention;

[0038] Figure 5 It is a cross-sectional structural schematic diagram of the biogas residue discharge device provided by the present invention.

[0039] Description of the markings in the figure: 100, mixing treatment equipment; 110, material adjustment tank; 111, feed pipe; 112, water inlet pipe; 113, conveying pipe; 120, anaerobic digestion reactor; 130, solid-liquid separation reactor; 131, reflux pipe; 132, drain pipe; 133, water stop valve; 134, separator main body; 135, rotating barrel; 1351, rotating arm; 136, rotating motor; 137, biogas residue discharge device; 1371, housing; 1372, discharge motor; 1373, rotating shaft; 1374, corrugated plate; 1375, biogas residue discharge pipe; 138, feed inlet; 139, waste liquid discharge pipe; 140, drying oven; 150, desulfurization system; 160, equipment power supply; 170, biogas generating set; 180, electric valve body; 190, time control switch; 200, stirring device; 300, centrifuge device; 400, drying device; 500, granulation equipment; 600, conveying pipe; 700, hydraulic rod; 800, baffle plate. Detailed implementation mode

[0040] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation mode of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0041] As Figure 1 , Figure 2 shown, a preparation system for preparing a filler using aluminum sludge and kitchen waste includes a mixing treatment equipment 100 for treating aluminum sludge and kitchen waste, a stirring device 200, a centrifuge device 300, a drying device 400, and a granulation equipment 500. The mixing treatment equipment 100 includes:

[0042] A material adjustment tank 110, which is arranged on the top of the mixing treatment equipment 100 and is used to mix aluminum sludge, pretreated kitchen waste materials and water to obtain a mixed slurry, and the slurry concentration is 8% - 10%;

[0043] An anaerobic digestion reactor 120 (specific reference website: https: / / item.taobao.com / item.htm?id=604299114048&ali_refid=a3_430673_1006:1249160016:N:twEHF3QKJ%2B2nApqswYRCUkzsgZYM%2FK%2ByaY56Aro8%2FJ%2F4GHVT4cC2PA%3D%3D:67a2f895ea75c47f711860e3bf43d89c&ali_trackid=1_67a2f895ea75c47f711860e3bf43d89c&spm=a2e0b.20350158.31919782.18&mt=) is used to carry out anaerobic digestion reaction on the mixed slurry transported by the material regulating tank 110, and anaerobic fermentation is carried out for 7 - 15 days;

[0044] A solid-liquid separation reactor 130 (specific reference website: https: / / detail.1688.com / offer / 562757155521.html?spm=a261b.12498223.ul20190117.59.107d496fXOIc6B&cosite=-&tracelog=p4p&_p_isad=1&clickid=b92efe76f1ac4abdb341ed15fa74ec26&sessionid=bf2097a6225ede9fabc9a6ee3e8304aa) is used to carry out solid-liquid separation on the mixed slurry that has completed the anaerobic fermentation reaction;

[0045] An oven 140 (specific reference website: https: / / detail.1688.com / offer / 598764520836.html?spm=a261b.12498223.ul20190117.258.3f064fda690adz) is used to dry the separated solid waste;

[0046] A desulfurization system 150 is used to desulfurize the biogas generated during the mixing process;

[0047] A device power supply 160 (specific reference website: https: / / detail.1688.com / offer / 581115313887.html?spm=a261b.2187593.0.0.21363f78Fun9lc) is used to provide electrical energy for the above-mentioned devices of the mixing treatment device 100;

[0048] The biogas generating set 170 (specific reference website: https: / / item.jd.com / 10058899139279.html), which is electrically connected to the equipment power supply 160, is used to charge the equipment power supply 160 with the electric energy generated by burning the desulfurized combustible gas.

[0049] The top of the material adjustment tank 110 is respectively connected with a feed pipe 111 for transporting the pretreated food waste slurry, a water inlet pipe 112, and a conveying pipe 113 for transporting aluminum sludge.

[0050] The solid-liquid separator 130 includes a separator main body 134, a rotating barrel 135 rotatably connected inside the separator main body 134, a rotating motor 136 fixed to the upper part of the separator main body 134 through a support frame, and a biogas residue discharge device 137 fixedly arranged at the lower part of the separator main body 134 by bolts. An inlet port 138 is provided at the upper part of the separator main body 134. Separation holes are evenly distributed on the barrel wall of the rotating barrel 135 for discharging the material liquid. The rotating barrel 135 is inclined and arranged inside the separator main body 134. A rotating arm 1351 is welded or fixed to the side wall of the rotating barrel 135 by bolts. The output end of the rotating motor 136 is threadedly connected to the rotating arm 1351. The output end of the rotating motor 136 rotates coaxially with the rotating barrel 135. A solid waste discharge port is provided at the bottom of the rotating barrel 135. The solid waste discharge port is rotatably connected to the separator main body 134 through a bearing sleeve. The outer side wall of the solid waste discharge port is key-connected to the inner ring of the bearing sleeve. The biogas residue discharge device 137 is connected to the separator main body 134 through a pipeline flange. The biogas residue discharge device 137 corresponds to the position of the solid waste discharge port. The biogas residue discharge device 137 includes a housing 1371, a discharge motor 1372 fixed to one end of the housing 1371, a rotating shaft 1373 key-connected to the output end of the discharge motor 1372, a plurality of corrugated plates 1374 welded on the rotating shaft 1373, and a biogas residue discharge pipe 1375. The biogas residue discharge pipe 1375 is detachably connected to the drying box 140. A waste liquid discharge pipe 139 is installed at the relative position between the lower part of the separator main body 134 and the biogas residue discharge device 137.

[0051] The material adjustment tank 110, the anaerobic digestion reactor 120, and the solid-liquid separation reactor 130 are sequentially connected through pipelines, and an electric valve body 180 is installed on each pipeline. Exhaust pipelines are fixedly provided on the upper parts of the side walls of the material adjustment tank 110, the anaerobic digestion reactor 120, the solid-liquid separation reactor 130, and the drying box 140. Each exhaust pipeline is connected to the inlet of the desulfurization system 150 through a main pipeline. The desulfurization system 150 and the biogas generating set 170 are connected through pipelines.

[0052] A time control switch 190 is installed between the power unit of the solid-liquid separation reactor 130 and the equipment power supply 160, which is used to control the solid-liquid separation of the slurry by the solid-liquid separation reactor 130 according to the preparation procedure. The drying oven 140 is connected to the equipment power supply 160 through the time control switch 190, which is used to control the drying operation time of 8 - 12 h. The electric valve body 180 is connected to the equipment power supply 160 through the time control switch 190, which is used to control the discharge of the slurry to be discharged into the next process equipment according to the preparation procedure. In addition to being charged by the biogas generator set, the equipment power supply 160 is connected to the city power supply for power supply.

[0053] The waste liquid discharge pipe 139 is connected with a reflux pipe 131. The other end of the reflux pipe 131 communicates with the material adjustment tank 110. A drain pipe 132 is connected to the reflux pipe 131, and a water stop valve 133 is installed on the drain pipe 132 to adjust the liquid level height of the material adjustment tank 110.

[0054] The present invention also discloses a preparation method for preparing a filler by using aluminum sludge and kitchen waste, and the specific steps are as follows:

[0055] Step S1. Perform pretreatment of solid-liquid separation, sorting, impurity removal, and wet sorting on kitchen waste to obtain kitchen waste slurry;

[0056] Step S2. Transport the kitchen waste slurry and aluminum sludge obtained in Step S1 to a mixing treatment device, mix them with water to obtain a mixed slurry, and then obtain biogas residue after anaerobic digestion reaction, solid-liquid separation, and drying treatment;

[0057] Step S3. Mix the biogas residue prepared in Step S2 with pyrite powder, limestone powder, and bentonite according to a mass ratio of 1∶3∶1∶1, add water and stir at a stirring rate of 300 r / min for 2 - 3 h to obtain a slurry;

[0058] Step S4. Centrifuge the slurry prepared in Step S3 by a centrifuge device at a rate of 3000 r / min for 15 min, remove the supernatant, and wash the precipitate with deionized water until the supernatant is neutral;

[0059] Step S5. Dry the neutral precipitate obtained in Step S4 at a drying temperature of 50℃ - 90℃ for 20 - 40 min, and granulate to obtain filler particles.

[0060] Four portions of sewage from a water treatment plant are provided, each portion of sewage is 25 kg, the TN concentration is 15.6 mg / L, NH 4 + -N concentration is 5.4 mg / L, and the PO4 3- concentration is 8.2 mg / L, and they are discharged into four artificial wetlands with the same structure;

[0061] Example 1:

[0062] Take 4 kg of the filler particles prepared in the present invention, 4 kg of zeolite, and 2 kg of gravel as fillers and put them into the constructed wetland for sewage purification treatment;

[0063] Example 2:

[0064] Take 6 kg of the filler particles prepared in the present invention, 4 kg of zeolite, and 2 kg of gravel as fillers and put them into the constructed wetland for sewage purification treatment;

[0065] Example 3:

[0066] Take 8 kg of the filler particles prepared in the present invention, 4 kg of zeolite, and 2 kg of gravel as fillers and put them into the constructed wetland for sewage purification treatment;

[0067] Control group:

[0068] Take 8 kg of the filler particles prepared by the prior art, 4 kg of zeolite, and 2 kg of gravel as fillers and put them into the constructed wetland for sewage purification treatment;

[0069] After 7 days, the TN, NH 4 + -N, and PO4 3- concentrations are shown in Table 1:

[0070] Example 1 Example 2 Example 3 Control group TN (mg / L) 4.32 3.15 2.22 6.72 <![CDATA[NH 4 + -N (mg / L)]]> 2.18 2.04 1.46 3.56 <![CDATA[PO4 3- (mg / L)]]> 2.56 2.24 1.42 6.25

[0071] As can be seen from the above table, when using the filler particles prepared in the present invention for water treatment, the TN removal rates are 72.3%, 79.8%, and 85.8% respectively, and the NH 4 + -N removal rates are 59.6%, 62.2%, and 72.9% respectively, and the PO4 3- removal rates are 68.8%, 72.7%, and 82.7% respectively. Compared with the TN removal rate of 56.9%, NH 4 + -N removal rate of 34.1%, and PO4 3- removal rate of 23.8% in the control group, there are significant improvement effects.

[0072] In summary: The present invention improves the denitrification and phosphorus removal efficiency of aluminum sludge, reduces secondary pollution, and also takes into account the problem of resource utilization of kitchen waste.

[0073] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0074] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A preparation method for preparing fillers using aluminum sludge and kitchen waste, characterized in that, the specific steps are as follows: Step S1. Perform pretreatment on kitchen waste, including solid-liquid separation, sorting, impurity removal, and wet sorting, to obtain kitchen waste slurry; Step S2. Transfer the kitchen waste slurry obtained in Step S1 and aluminum sludge to a mixing treatment device, mix with water to obtain a mixed slurry, and then obtain biogas residue after anaerobic digestion reaction, solid-liquid separation, and drying treatment; Step S3. Mix the biogas residue obtained in Step S2 with pyrite powder, limestone powder, and bentonite in a mass ratio of 1:3:1:1, and add water and stir to obtain a slurry; Step S4. Centrifuge the slurry obtained in Step S3 through a centrifuge device to remove the supernatant, and rinse the precipitate with deionized water until the supernatant is neutral; Step S5. Dry and granulate the neutral precipitate obtained in Step S4 to obtain filler particles.

2. The preparation method for preparing fillers using aluminum sludge and kitchen waste according to claim 1, characterized in that: The stirring rate in Step S3 is 300 r / min, and the stirring time is 2 - 3 h.

3. The preparation method for preparing fillers using aluminum sludge and kitchen waste according to claim 1, characterized in that: The rate of the centrifuge device in Step S4 is 3000 r / min, and the centrifugation time is 15 min.

4. The preparation method for preparing fillers using aluminum sludge and kitchen waste according to claim 1, characterized in that: The drying temperature in Step S5 is 50°C - 90°C, and the time is 20 - 40 min.

5. A preparation system for preparing fillers using aluminum sludge and kitchen waste, including a mixing treatment device for treating aluminum sludge and kitchen waste, a stirring device, a centrifuge device, a drying device, and a granulation device, characterized in that, the mixing treatment device includes: A material adjustment tank for mixing aluminum sludge and pretreated kitchen waste materials with water to obtain a mixed slurry; An anaerobic digestion reactor for performing anaerobic digestion reaction on the mixed slurry transported from the material adjustment tank; A solid-liquid separation reactor for performing solid-liquid separation on the mixed slurry that has completed the anaerobic fermentation reaction; A drying oven for drying the separated solid waste; A desulfurization system for desulfurizing the biogas generated during the mixing treatment process; An equipment power supply for providing electrical energy to the above devices of the mixing treatment device; A biogas generator set, electrically connected to the equipment power supply, for charging the equipment power supply with the electrical energy generated by burning the desulfurized combustible gas; The top of the material adjustment tank is respectively connected to a feed pipe for transporting pretreated kitchen waste slurry, a water inlet pipe, and a conveying pipe for transporting aluminum sludge; The solid-liquid separator includes a separator main body, a rotating barrel rotatably connected inside the separator main body, a rotating motor fixedly arranged on the upper part of the separator main body, and a biogas residue discharging device fixedly arranged on the lower part of the separator main body. An inlet is provided at the upper part of the separator main body. Separation holes are evenly distributed on the barrel wall of the rotating barrel for discharging the material liquid. The rotating barrel is inclined and arranged inside the separator main body. A rotating arm is fixedly connected along the side wall of the rotating barrel. The rotating motor is fixedly connected with the rotating arm, and the output end of the rotating motor rotates coaxially with the rotating barrel. A solid waste discharge port is arranged at the bottom of the rotating barrel. The solid waste discharge port is rotatably connected with the separator main body through a bearing sleeve. The biogas residue discharging device is fixedly arranged on the separator main body through a pipeline, and the biogas residue discharging device corresponds to the position of the solid waste discharge port. The biogas residue discharging device includes a shell, a discharge motor fixedly arranged at one end of the shell, a rotating shaft fixedly connected with the output end of the discharge motor, a plurality of corrugated plates fixedly arranged on the rotating shaft, and a biogas residue discharge pipe. The biogas residue discharge pipe is detachably connected with the drying box; A waste liquid discharge pipe is arranged at the lower part of the separator main body at a position opposite to the biogas residue discharging device.

6. A preparation system for preparing a filler by using aluminum sludge and kitchen waste according to claim 5, characterized in that: The material adjustment tank, the anaerobic digestion reactor, and the solid-liquid separation reactor are sequentially connected in communication through pipelines, and an electric valve body is installed on each pipeline. Exhaust pipelines are fixedly arranged on the upper parts of the side walls of the material adjustment tank, the anaerobic digestion reactor, the solid-liquid separation reactor, and the drying box. Each exhaust pipeline is communicated with the inlet of the desulfurization system through a main pipeline, and the desulfurization system is connected with the biogas generating set through a pipeline.

7. A preparation system for preparing a filler by using aluminum sludge and kitchen waste according to claim 6, characterized in that: A time control switch is installed between the power device of the solid-liquid separation reactor and the equipment power supply for controlling the solid-liquid separation of the slurry by the solid-liquid separation reactor according to the preparation procedure; The drying box is connected with the equipment power supply through a time control switch for controlling the drying operation time; The electric valve body is connected with the equipment power supply through a time control switch for controlling the discharge of the slurry to be discharged into the next process equipment according to the preparation procedure.

8. A preparation system for preparing a filler by using aluminum sludge and kitchen waste according to claim 5, characterized in that: The waste liquid discharge pipe is connected with a return pipe, the other end of the return pipe is communicated with the material adjustment tank, and a drain pipe is communicated with the return pipe. A water stop valve is installed on the drain pipe for adjusting the liquid level height of the material adjustment tank.

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