A method and device for recycling waste clothes

Abstract

This invention relates to a waste clothing resource recovery device, comprising: a crushing and feeding unit, including a crusher, a receiving funnel, and a feeding pipe; a saccharification and alcohol production unit, including a reaction tank and an electromagnetic stirrer; and an algae cultivation and carbon fixation unit, including a microalgae cultivation tank, a reflux pipe, and a lifting platform; the reaction tank and the microalgae cultivation tank are connected through the reflux pipe. This invention also relates to a waste clothing resource recovery method, which can effectively achieve cotton-polyester separation and alcohol production and carbon fixation of waste clothing, and has advantages such as environmental friendliness, high resource recovery rate, high operating efficiency, and significant economic benefits.

Description

Technical Field

[0001] This invention relates to the field of environmental protection, and in particular to a method and apparatus for the resource-based treatment of waste clothing. Background Technology

[0002] Textiles and clothing are mainly made of various organic multi-molecular materials such as polyester mixed with cotton fabrics. As one of the main consumer goods in people's daily lives, the annual consumption is huge, resulting in a large amount of waste clothing. Currently, waste clothing is mainly disposed of by incineration and landfill, which not only wastes useful resources but also harms the environment. Existing cotton-polyester separation technologies include ionic liquid / co-solvent systems and hydrothermal phosphoric acid methods, with cotton fiber recovery efficiency reaching up to 92% and polyester fiber recovery efficiency reaching up to 99%. However, these are all in the laboratory stage and have high recycling costs and energy consumption. Some existing technologies use waste clothing to produce ethanol, but the resource recovery rate is low and the ethanol production effect is not good. Further research is needed on efficient resource-based treatment methods and devices for waste clothing. Summary of the Invention

[0003] The purpose of this invention is to provide a device for the resource recovery and treatment of waste clothing, comprising:

[0004] The crushing and feeding unit includes a crusher 1, a receiving hopper 6, and a feed pipe 7;

[0005] The saccharification and alcohol production unit includes a reaction tank 2 and an electromagnetic stirrer 8;

[0006] The algae cultivation and carbon fixation unit includes a microalgae culture tank 3, a reflux pipe 4, and a lifting platform 9;

[0007] The reaction tank 2 and the microalgae culture tank 3 are connected by the reflux pipe 4.

[0008] In a preferred embodiment of the present invention, the crusher 1 includes a feed inlet 101, a transmission gear 102, a crushing blade 103, and a motor 104. A receiving hopper 6 is placed below the crushing blade 103 of the crusher 1 to receive the crushed shredded cloth. The upper end of the feed pipe 7 is connected to the lower end of the receiving hopper 6.

[0009] In a preferred embodiment of the present invention, the reaction tank 2 is placed on an electromagnetic stirrer 8.

[0010] In a preferred embodiment of the present invention, the reaction tank 2 is placed at the lower part of the feed pipe 7. The reaction tank 2 includes a first sealing cover 201, a double-layer mesh 202, a hanging rope 203, a liquid outlet valve 204 with a filter membrane at the front end, an air outlet 205, and a hook 206.

[0011] In a preferred embodiment of the present invention, the first sealing cover 201 is located at the top of the reaction tank 2, the small mesh 2021 and the large mesh 2022 are suspended from the tank wall of the reaction tank 2 by the hanging rope 203 and the hook 206, the required height of the double mesh 202 in the reaction tank 2 is determined by adjusting the length of the hanging rope, the vent 205 is located in the middle of the reaction tank 2, and the liquid outlet valve 204 is located at the bottom of the reaction tank 2.

[0012] In a preferred embodiment of the present invention, the small mesh 2021 is placed inside the large mesh 2022, the mesh diameter of the small mesh 2021 is 20-40 mesh, and the mesh diameter of the large mesh 2022 is 20-40 mesh.

[0013] In a preferred embodiment of the present invention, the microalgae culture tank 3 is provided with a second sealing cover 301, an air outlet pipe 302, an LED lamp tube 303, a spiral tube 304, and an air inlet 305.

[0014] In a preferred embodiment of the present invention, the second sealing cover 301 is located at the top of the microalgae culture tank 3, the air outlet pipe 302 is located at the top of the second sealing cover 301, the upper end of the LED lamp tube 303 is connected to the second sealing cover 301 and suspended in the middle of the microalgae culture tank 3, the air inlet 305 is located at the lower part of the microalgae culture tank 3, and the coiled tube 304 is connected to the air inlet 305 and placed at the lower part of the microalgae culture tank 3.

[0015] In a preferred embodiment of the present invention, the top of the spiral tube 304 has several small holes with a diameter of 10-15 mm.

[0016] In a preferred embodiment of the present invention, the first sealing connection cover 401 is connected to the air outlet 205 of the reaction tank 2, the second sealing connection cover 402 is connected to the air inlet 305 of the microalgae culture tank 3, and the reflux pipe 4 is connected to the first sealing connection cover 401 and the second sealing connection cover 402.

[0017] A preferred embodiment of the present invention further includes a mobile trolley for carrying each unit device and transferring it as a whole.

[0018] In a preferred embodiment of the present invention, the crushing and feeding unit is placed on the upper layer of the mobile trolley, and the saccharification and alcohol production unit and the algae cultivation and carbon fixation unit are placed on the lower layer of the mobile trolley.

[0019] In a preferred embodiment of the present invention, the microalgae culture tank 3 is placed on a lifting platform 9, which is used to raise the microalgae culture tank 3 so that the algae solution in the tank flows back into the reaction tank 2 through the return pipe 4.

[0020] This invention relates to a method for resource recovery of waste clothing using the waste clothing resource recovery device of this invention, comprising the following steps:

[0021] (1) The waste clothing is crushed into shredded fabric with a particle size of 1mm to 3mm by the crusher 1, and the shredded fabric is fixed between the small screen 2021 and the large screen 2022 of the reaction tank 2;

[0022] (2) Add alkaline solution to reaction tank 2, immerse the shredded cloth fixed between the small mesh 2021 and the large mesh 2022 in reaction tank 2, start electromagnetic stirrer 8, control the alkaline hydrolysis temperature at 100-120℃, the stirring speed at 150-180rpm, and the hydrolysis time at 1-2h, squeeze the shredded cloth with the small mesh 2021 and the large mesh 2022 to obtain solid material and waste liquid, open the liquid outlet valve 204 with filter membrane at the front end to release the waste liquid, and then add water to wash the solid material multiple times until it is neutral;

[0023] (3) Add water to the neutralized solid material at a solid-liquid ratio of 1:5-1:20 to obtain a mixture. Adjust the pH of the mixture to 4.0-6.0. Then add cellulase at a ratio of 4-30 FPU / g solid material (dry weight). Control the stirring speed of the electromagnetic stirrer 8 to 150-180 rpm, the saccharification temperature to 50-60℃, and saccharify for 48-90 h to obtain the saccharified liquid.

[0024] (4) Add 1-12% (v / v) yeast liquid to the saccharification liquid, control the stirring speed of electromagnetic stirrer 8 to 150-180 rpm, the fermentation temperature to 35-37℃, and ferment to produce alcohol for 18-72 hours to obtain fermentation liquid.

[0025] (5) Open the liquid outlet valve 204 with filter membrane at the front end to release the fermentation liquid. The large strainer 2022 traps the residue in the fermentation liquid. The residue is discharged from the reaction tank 2 by lifting the large strainer 2022 with the hanging rope 203 and then reused.

[0026] In the preferred embodiment of the present invention, in step (1), the waste clothing is cotton-polyester blended waste clothing.

[0027] In the preferred embodiment of the present invention, in step (1), the waste clothing contains more than 50% cotton, preferably 50-70% cotton, and 30-50% polyester.

[0028] In a preferred embodiment of the present invention, in step (1), the waste liquid can be recycled back into the reaction tank 2.

[0029] In a preferred embodiment of the present invention, in step (2), the mass concentration of the alkaline solution is 1-5%.

[0030] In a preferred embodiment of the present invention, in step (3), the acid used to adjust the pH value includes any one or a combination of hydrochloric acid, phosphoric acid, and malic acid.

[0031] In the preferred embodiment of the present invention, in step (3), the pH of the mixture is adjusted to 4.5-5.0.

[0032] In the preferred embodiment of the present invention, in step (3), cellulase is added at a rate of 8-20 FPU / g solid material (dry weight), preferably at a rate of 16-20 FPU / g solid material (dry weight).

[0033] In the preferred embodiment of the present invention, in step (4), 5-10% (v / v) of yeast solution is added to the saccharification solution.

[0034] In the preferred embodiment of the present invention, in step (4), the method for preparing the yeast liquid is as follows: weigh Angel brewing yeast dry powder, add it to a sterilized 2% (w / v) sucrose solution at a solid-liquid ratio of 1:50-60, and activate it for 30 minutes to obtain the product.

[0035] In the preferred embodiment of the present invention, in step (4), the pH value of the fermentation broth is adjusted to 5.5-6.0 every 6-12 hours.

[0036] In a preferred embodiment of the present invention, in step (5), the residue can be used as fuel, recycled polyester, chemical raw material and building material.

[0037] In a preferred embodiment of the present invention, the carbon dioxide gas produced by fermentation in step (4) is introduced into the microalgae culture tank 3 inoculated with microalgae. The microalgae absorb the carbon dioxide through photosynthesis, and the exhaust gas is absorbed through the carbon dioxide absorption pool 3021 at the end of the exhaust pipe 302. When the microalgae in the microalgae culture tank 3 accumulate to 9.9 × 10⁻⁶, the carbon dioxide gas is further absorbed by the microalgae culture tank 3. 7 CFU / mL -2.15×10 8 After reaching CFU / mL, drain the solution from reaction tank 2 and return the algal solution to the reaction tank to continue the reaction.

[0038] In a preferred embodiment of the present invention, the algal solution can be returned to either step (2) or step (3) of the reaction tank.

[0039] In a preferred embodiment of the present invention, the algal solution reflux ratio is 10%-30%.

[0040] In the preferred embodiment of the present invention, the algae cultivation temperature is 20-35℃.

[0041] In a preferred embodiment of the present invention, the residual liquid after ethanol extraction from the ethanol fermentation broth can be added to the microalgae culture tank 3 as an algae nutrient solution.

[0042] In a preferred embodiment of the present invention, the carbon dioxide absorption tank 3021 contains a solid absorbent.

[0043] Unless otherwise stated, when this invention relates to percentages between liquids, the percentage is volume / volume percentage; when this invention relates to percentages between liquids and solids, the percentage is volume / weight percentage; when this invention relates to percentages between solids and liquids, the percentage is weight / volume percentage; the remainder is weight / weight percentage.

[0044] Compared with the prior art, the beneficial effects of the present invention include:

[0045] (1) The device of this invention crushes waste clothing and feeds it into a reaction tank. After removing lignin from the cotton fibers through alkaline hydrolysis, cellulase is added to convert the cellulose into a saccharified liquid, which is then separated from the polyester. Yeast is then added to the saccharified liquid for anaerobic fermentation, converting the saccharified liquid into an ethanol solution, which is then released, and the remaining polyester is recovered. The polyester separated by saccharification can be re-spun or used to produce recycled polyester, or it can be used as a chemical raw material. The carbon dioxide produced during fermentation is passed into a microalgae culture tank, where the microalgae absorb carbon dioxide and produce oxygen through photosynthesis. After a certain amount of algal liquid is enriched, it is returned to the reaction tank, and the alkaline hydrolysis, saccharification, and alcohol production processes are repeated to form a closed-loop cycle process. It can also be sold to marine aquaculture, pharmaceutical, or oil production companies, thereby realizing the full-component resource utilization of waste fabric.

[0046] (2) The device of the present invention completes the alkaline hydrolysis, saccharification and alcohol production processes in one device, which has a small footprint, low equipment investment cost, low energy consumption and the advantages of mobility, high integration, good safety, high equipment utilization rate and short total process time. It can be used for decentralized processing in residential areas, garment factories, garbage recycling stations and other places. It reduces labor costs and safety risks and realizes full automation of the device.

[0047] (3) This invention scientifically selects the process parameters for alkaline hydrolysis, saccharification, and ethanol production to achieve resource utilization of waste clothing. The fermentation time is short, and the ethanol purity and yield are high. It can effectively achieve the separation of cotton and polyester from waste clothing and the production of alcohol and carbon fixation. It has the advantages of being environmentally friendly, having a high degree of resource utilization, high equipment operating efficiency, and significant economic benefits. Attached Figure Description

[0048] Figure 1 A schematic diagram of the overall structure of the waste clothing resource utilization device in this invention.

[0049] Figure 2 An overall perspective view of the waste clothing resource recycling device of this invention.

[0050] Figure 3 A perspective view of the crushing and feeding unit in this invention.

[0051] Figure 4 A three-dimensional view of the alkaline hydrolysis, saccharification, and alcohol production units in this invention.

[0052] Figure 5 The schematic diagram and cross-sectional view of the double-layer mesh structure in this invention.

[0053] Figure 6 A schematic diagram of the structure of the algae-cultivating and carbon-fixing unit in this invention.

[0054] Figure 7 A schematic diagram of the spiral tube in this invention.

[0055] Figure 8 A schematic diagram of the connection structure between the reaction tank and the microalgae culture tank in this invention.

[0056] Figure 9 Flowchart of waste clothing resource utilization in this invention

[0057] in,

[0058] 1-Crusher, 101-Feed inlet, 102-Transmission gear, 103-Crushing blades, 104-Motor,

[0059] 2-Reaction tank, 201-First sealing cover, 202-Double-layer mesh screen, 2021-Small mesh screen, 2022-Large mesh screen, 203-Hanging rope, 204-Liquid outlet valve, 205-Gas outlet, 206-Hook,

[0060] 3-Microalgae culture tank, 301-Second sealing cover, 302-Air outlet pipe, 3021-Carbon dioxide absorption tank, 3022-Purified gas outlet, 303-LED lamp tube, 304-Swirling tube, 305-Air inlet hole.

[0061] 4-Return pipe, 401-First sealing connection cover, 402-Second sealing connection cover

[0062] 5-Mobile trolley, 6-Receiving funnel, 7-Feed pipe, 8-Magnetic stirrer, 9-Lifting platform. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0065] The yeast culture solution in this example was prepared as follows: 1g of sucrose was dissolved in 50mL of deionized water to prepare a 2% (w / v) sucrose solution, which was then sterilized in an autoclave at 115℃ for 15 minutes; 1g of yeast powder was weighed and placed in the sterilized sucrose solution, and rehydrated for 30 minutes to obtain the yeast culture solution. The yeast powder was Angel Yeast High-Activity Dry Yeast for Brewing (heat-resistant type, 500g / bag), purchased from Angel's official website.

[0066] The cellulase was purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd., with an enzyme activity of 200 FPU / mL.

[0067] Example 1: Waste clothing resource recovery device of the present invention

[0068] The waste clothing resource recovery device of the present invention (see schematic diagram of the overall structure of the waste clothing resource recovery device as shown in the figure) Figure 1 As shown, the overall 3D view is as follows: Figure 2 (as shown), including:

[0069] The crushing and feeding unit is used for crushing waste clothing.

[0070] The alkaline hydrolysis saccharification alcohol production unit is used for the separation of cotton fibers and polyester components in waste clothing after alkaline hydrolysis, the saccharification of cotton fibers and anaerobic fermentation to produce ethanol.

[0071] The algae-cultivating carbon fixation unit is used to utilize the carbon dioxide produced during the alcohol production stage to enable microalgae to synthesize intracellular sugars through photosynthesis.

[0072] The gas guiding and algal liquid reflux unit is used to introduce the carbon dioxide generated in the reaction tank into the microalgae culture tank. After the microalgae proliferate to a certain concentration, the algal liquid is refluxed back to the reaction tank and used as water for alkaline hydrolysis, saccharification and alcohol production of waste clothing shreds.

[0073] In some specific embodiments, the crushing and feeding unit includes a crusher 1, a receiving funnel 6, and a feed pipe 7. The crusher 1 is used to crush waste cotton and polyester clothing into shredded fabric with a particle size of 1mm to 3mm. The receiving funnel 6 and the feed pipe 7 are used to guide the shredded fabric into the reaction tank 2.

[0074] The alkaline hydrolysis-saccharification alcohol production unit includes a reaction tank 2 and an electromagnetic stirrer 8, used to anaerobically ferment cotton fiber components from waste clothing to produce ethanol after alkaline hydrolysis and saccharification. The reaction tank 2 provides space for the alkaline hydrolysis, saccharification, and alcohol production reactions, while the electromagnetic stirrer 8 is used to stir and ensure that the shredded fabric reacts fully.

[0075] The algae cultivation and carbon fixation unit, along with the gas guiding and algae solution reflux unit, includes a microalgae cultivation tank 3, a reflux pipe 4, and a lifting platform 9. The reaction tank 2 is connected to the microalgae cultivation tank 3 via the reflux pipe 4. Carbon dioxide generated in the reaction tank is introduced into the microalgae cultivation tank through the reflux pipe 4, causing the microalgae to undergo photosynthesis and synthesize intracellular sugars. The lifting platform 9 is used to raise the microalgae cultivation tank 3, allowing the algae solution after microalgae proliferation to reflux back to the reaction tank 2 through the reflux pipe 4. This solution is then used as water to mix with shredded waste clothing for alkaline hydrolysis, saccharification, and fermentation to produce alcohol.

[0076] The mobile trolley 5 is used to carry and transfer each unit device as a whole. The crusher 1 is placed on the upper layer of the mobile trolley 5, and the reaction tank 2, electromagnetic stirrer 8, microalgae culture tank 3 and lifting platform 9 are placed on the lower layer of the mobile trolley 5.

[0077] A 3D view of the crushing and feeding unit is shown below. Figure 3 As shown. In some specific embodiments, the crusher 1 is a double-toothed roller crusher, including a feed inlet 101, a transmission gear 102, a crushing blade 103, a motor 104, and a receiving hopper 6 placed below the crushing blade 103 of the crusher 1 to receive the crushed shredded cloth. The upper end of the feed pipe 7 is connected to the lower end of the receiving hopper 6.

[0078] A three-dimensional diagram of the alkaline hydrolysis saccharification alcohol production unit is shown below. Figure 4 As shown. The reaction tank 2 is placed at the bottom of the feed pipe 7. The reaction tank 2 includes a first sealing cover 201, a double-layer mesh 202, a hanging rope 203, a liquid outlet valve 204 with a filter membrane at the front end, a gas outlet 205, and a hook 206.

[0079] The sealing cap 201 is located at the top of the reaction tank 2. The small mesh 2021 and the large mesh 2022 are suspended from the tank wall of the reaction tank 2 by the hanging rope 203 and the hook 206. The required height of the double mesh 202 in the reaction tank 2 is determined by adjusting the length of the hanging rope. The vent 205 is located in the middle of the reaction tank 2, and the liquid outlet valve 204 is located at the bottom of the reaction tank 2.

[0080] Schematic diagram and cross-sectional view of the double-layer mesh structure are as follows: Figure 5As shown. The small mesh 2021 is placed inside the large mesh 2022. The mesh diameter of the small mesh 2021 is 20-40 mesh, and the mesh diameter of the large mesh 2022 is 20-40 mesh.

[0081] The structural diagram of the algae-cultivating carbon fixation unit is shown below. Figure 6 As shown. The microalgae culture tank 3 is equipped with a second sealing cover 301, an air outlet pipe 302, an LED lamp tube 303, a spiral tube 304, and an air inlet 305. The LED lamp tube 303 is used to supplement light for the microalgae when light conditions are insufficient; the air outlet pipe 302 is used to expel oxygen produced by photosynthesis from the microalgae culture tank.

[0082] The second sealing cover 301 is located at the top of the microalgae culture tank 3, the air outlet pipe 302 is located at the top of the second sealing cover 301, the upper end of the LED lamp tube 303 is connected to the sealing cover 301 and suspended in the middle of the microalgae culture tank 3, the air inlet 305 is located at the lower part of the microalgae culture tank 3, and the coiled tube 304 is connected to the air inlet 305 and placed at the lower part of the microalgae culture tank 3.

[0083] A schematic diagram of the spiral tube is shown below. Figure 7 As shown. The top of the spiral tube 304 has several small holes with a diameter of 10-15 mm, which are used to form small carbon dioxide bubbles when carbon dioxide enters the microalgae culture tank 3 so that it can be fully dissolved in the algae solution;

[0084] A schematic diagram of the connection structure between the reaction tank and the microalgae culture tank is shown below. Figure 8 As shown, it includes a return pipe 4, a first sealing connection cover 401, and a second sealing connection cover 402.

[0085] The first sealing connection cover 401 is connected to the air outlet 205 of the reaction tank 2, the second sealing connection cover 402 is connected to the air inlet 305 of the microalgae culture tank 3, and the reflux pipe 4 is connected to the first sealing connection cover 401 and the second sealing connection cover 402.

[0086] The workflow diagram of the waste clothing recycling device is as follows: Figure 9 As shown, combined with Figures 1 to 9 According to an embodiment of the present invention, a method for the resource utilization of waste clothing is carried out according to the following steps;

[0087] Step S1: Crushing process

[0088] Waste clothing enters the crusher 1 through the feed inlet 101. The motor 104 drives the transmission gear 102, which in turn causes the crushing blades 103 to rotate. The waste clothing is crushed into shredded fabric with a particle size of 1mm to 3mm and enters the receiving funnel 6. It then slides through the feed pipe 7 connected to it into the large mesh 2022 suspended in the reaction tank 2. Then, the small mesh 2021 is stacked on top of the large mesh 2022 to fix the shredded fabric in the middle layer of the double mesh 202.

[0089] Step S2, alkaline hydrolysis

[0090] Add sodium hydroxide solution to reaction tank 2 to immerse the shredded cloth in double-layer filter screen 202. Start electromagnetic stirrer 8 to drive magnetic particles to rotate and stir the alkaline solution, so that the alkaline solution fully contacts the shredded cloth. After alkaline hydrolysis, squeeze the shredded cloth with small filter screen 2021 and large filter screen 2022 to filter out the alkaline solution. Release the alkaline solution through the liquid outlet valve 204 with filter membrane at the front end, retaining the fine shredded cloth. Then add clean water to wash the solid phase material of double-layer filter screen 202 multiple times until the pH is neutral, and release the washing water.

[0091] In some preferred embodiments, sodium hydroxide solution and water are added to reaction tank 2 to achieve a sodium hydroxide content of 1%-5% in the reaction solution. The hydrolysis temperature is controlled at 30℃-120℃, the stirring speed at 150-180 rpm, and the alkaline hydrolysis time at 1 h-3 h. The solid material is washed until neutral, and the neutralized solid material contains 70%-75% cellulose, 0.5-1.0% hemicellulose, a very small amount of residual lignin, and a certain mass of polyester.

[0092] Step S3, Cotton Fiber Saccharification

[0093] Add water or reflux algae solution from microalgae culture tank 3 to the neutralized solid material in reaction tank 2 to obtain a mixed solution. Adjust the pH of the mixed solution to 4.5-5.5 with 3% hydrochloric acid. Then add cellulase at 4-30 FPU / g solid material (based on the dry matter weight TS of the solid material). Start the electromagnetic stirrer 8 to drive the magnetic stirrer to rotate and stir. The cellulose in the shredded cloth is converted into monosaccharides or disaccharides and dissolved to form a saccharified solution.

[0094] In some preferred embodiments, the solid-liquid ratio of the solid material to water is 1:5-1:20, the amount of cellulase added is 16-20 FPU / g solid material (TS), the stirring speed of the electromagnetic stirrer 8 is controlled at 150-180 rpm, the saccharification temperature is 50-60℃, and the saccharification time is 36-72h.

[0095] Step S4: Anaerobic fermentation of saccharified liquid to produce ethanol.

[0096] Yeast liquid is added to reaction tank 2, and ethanol is produced by anaerobic fermentation using the reducing sugar in the saccharification liquid. An electromagnetic stirrer drives a magnetic stirrer to rotate and stir the fermentation liquid.

[0097] In some preferred embodiments, the amount of yeast culture added is 1-12%, preferably 5-10%. The stirring speed of the electromagnetic stirrer 8 is controlled at 150-180 rpm, the fermentation temperature is 30-38℃, and the fermentation time for alcohol production is 12-24 hours. The pH value is adjusted to 5.5-6.0 every 6-12 hours during the fermentation process.

[0098] After the fermentation and alcohol production are completed, the ethanol solution is released through the outlet valve 204 with a filter membrane at the front end. The residue is intercepted by the large strainer 2022 and discharged from the reaction tank 2 by the hanging rope 203. The main component of the residue is polyester, which can be used as fuel, recycled polyester, chemical raw material and building material.

[0099] Step S5: Microalgae absorb carbon dioxide and produce sugar through photosynthesis.

[0100] The carbon dioxide gas produced during fermentation enters the microalgae culture tank 3, which is inoculated with microalgae, through the first sealing connection cover 401, the reflux pipe 4, the second sealing connection cover 402, and the spiral pipe 304. The microalgae absorb the carbon dioxide through photosynthesis, and the exhaust gas is discharged from the purified gas outlet 3022 after passing through the carbon dioxide absorption pool 3021 at the end of the exhaust pipe 302. Natural light is provided to the microalgae on sunny days, while LED lights 303 are used to provide light to the microalgae on cloudy or rainy days.

[0101] In some preferred examples, the algae cultivation temperature is 20-35℃, and a small amount of nitrogen, phosphorus and potassium liquid fertilizer is added. Alternatively, the residue after ethanol extraction from the ethanol fermentation liquid can be used as an algae cultivation nutrient solution.

[0102] The carbon dioxide absorption tank 3021 contains a solid absorbent, the main components of which are calcium hydroxide, calcium oxide and a color-changing indicator. The new absorbent is pink, and the adsorbent after it has expired is pure white. The replaced expired adsorbent can be used in plastics, construction, chemical and other fields.

[0103] Step S6: The enriched microalgae are returned to the reaction tank for reuse.

[0104] When the microalgae in microalgae culture tank 3 accumulated to 9.9 × 10⁻⁶ 7 CFU / mL -2.15×10 8 After reaching CFU / mL, the solution in reaction tank 2 can be released. The microalgae culture tank 3 is raised using the lifting platform 9, so that the algae solution flows into reaction tank 2 through the first sealing connection cover 402, the reflux pipe 4, and the second sealing connection cover 401. Step S2 is repeated together with the shredded cloth. The lignin in the microalgae is dissolved by alkali hydrolysis, and the cellulose in the microalgae is saccharified by cellulase, so that the intracellular sugar of the microalgae flows out and ferments to produce alcohol, forming a closed loop.

[0105] Example 1

[0106] The resource-based treatment method for used clothing of the present invention is carried out according to the following steps:

[0107] (1) The waste clothing (containing 69% cotton and 31% polyester) is crushed into shredded fabric with a particle size of 1mm to 3mm by the crusher 1. 300g of shredded fabric is fixed between the small screen 2021 and the large screen 2022 of the reaction tank 2.

[0108] (2) Add 1% sodium hydroxide solution to reaction tank 2 to immerse the shredded cloth between small mesh 2021 and large mesh 2022. Start electromagnetic stirrer 8, control the alkaline hydrolysis temperature at 120℃, the stirring speed at 150rpm, and the hydrolysis time at 1h. Then, squeeze the shredded cloth with small mesh 2021 and large mesh 2022 to obtain solid material and alkaline solution. Open the liquid outlet valve 204 with filter membrane at the front end to release the alkaline solution. Add clean water to wash the solid material of double-layer filter screen 202 multiple times until neutral. After testing, the composition of the neutral solid material obtained after washing is: cellulose 71.2%, hemicellulose 0.82%, and lignin 0.

[0109] (3) Mix the washed solid material with water at a solid-liquid ratio of 1:5, adjust the pH of the mixture to 5.0 with 3% hydrochloric acid, add cellulase at 20 FPU / g solid material (dry weight), control the stirring speed of electromagnetic stirrer 8 to 150 rpm, and the saccharification temperature to 55℃. After saccharification for 72 hours, the saccharified liquid is obtained.

[0110] (4) Add 5% yeast culture to the saccharification liquid by volume, and use the reducing sugar in the saccharification liquid to carry out anaerobic fermentation to produce ethanol. Control the stirring speed of the electromagnetic stirrer 8 to 150 rpm and the fermentation temperature to 37℃. No pH adjustment is required. After 24 hours of fermentation to produce ethanol, the fermentation liquid is obtained. The ethanol concentration in the fermentation liquid can reach 40.8 g / L.

[0111] (5) After the fermentation and alcohol production is completed, the fermentation liquid is discharged through the liquid outlet valve 204 with filter membrane at the front end. The residue on the large strainer 2022 is discharged from the reaction tank 2 by the hanging rope 203. It can be used as fuel, recycled polyester, chemical raw materials and building materials.

[0112] Example 2

[0113] The resource-based treatment method for used clothing of the present invention is carried out according to the following steps:

[0114] (1) The waste clothing (containing 69% cotton and 31% polyester) is crushed into shredded fabric with a particle size of 1mm to 3mm by the crusher 1. 300g of shredded fabric is fixed between the small screen 2021 and the large screen 2022 of the reaction tank 2.

[0115] (2) Add 1% sodium hydroxide solution to reaction tank 2 to immerse the shredded cloth between small mesh 2021 and large mesh 2022. Start electromagnetic stirrer 8, control the alkaline hydrolysis temperature at 120℃, the stirring speed at 150rpm, and the hydrolysis time at 1h. Then, squeeze the shredded cloth with small mesh 2021 and large mesh 2022 to obtain solid material and alkaline solution. Open the liquid outlet valve 204 with filter membrane at the front end to release the alkaline solution. Add clean water to wash the solid material of double-layer filter screen 202 multiple times until neutral. After testing, the composition of the neutral solid material obtained after washing is: cellulose 71.2%, hemicellulose 0.82%, and lignin 0.

[0116] (3) Mix the washed solid material with water at a solid-liquid ratio of 1:5, adjust the pH of the mixture to 5.0 with 3% hydrochloric acid, add cellulase at 20 FPU / g solid material (dry weight), control the stirring speed of electromagnetic stirrer 8 to 150 rpm, and the saccharification temperature to 55℃. After saccharification for 72 hours, the saccharified liquid is obtained.

[0117] (4) Add 5% yeast liquid to the saccharification liquid by volume ratio, and use the reducing sugar in the saccharification liquid to carry out anaerobic fermentation to produce ethanol. Control the stirring speed of electromagnetic stirrer 8 to 150 rpm and the fermentation temperature to 37℃. No pH adjustment is required. Fermentation produces alcohol.

[0118] (5) While anaerobic fermentation in reaction tank 2 produces alcohol, the generated carbon dioxide gas is introduced into the microalgae culture tank 3 containing microalgae through the reflux pipe 4 to provide carbon dioxide for the photosynthesis of microalgae. The algae culture temperature is 35℃, and a small amount of nitrogen, phosphorus, and potassium liquid fertilizer is added. Alternatively, the residue after ethanol extraction from the ethanol fermentation liquid can be used as the algae culture liquid fertilizer. Natural light is provided to the microalgae on sunny days, and LED tubes 303 are used to provide light to the microalgae on cloudy or rainy days. When the microalgae in the microalgae culture tank 3 accumulate to 9.9 × 10⁻⁶, the algae culture is considered complete. 7 CFU / mL -2.15×10 8 After CFU / mL, the microalgae culture tank 3 is raised using the lifting platform 9, and the algae solution is refluxed into the reaction tank 2 through the reflux pipe 4 at a reflux ratio of 30%, and carried out alkaline hydrolysis in step (2) together with the shredded cloth.

[0119] (6) After fermentation for 24 hours, the fermentation broth is obtained, and the ethanol concentration in the fermentation broth can reach 60.1 g / L. The fermentation broth is discharged through the outlet valve 204 with a filter membrane at the front end. The residue on the large strainer 2022 is discharged from the reaction tank 2 by the hanging rope 203. It can be used as fuel, recycled polyester, chemical raw materials and building materials.

[0120] Example 3

[0121] The resource-based treatment method for used clothing of the present invention is carried out according to the following steps:

[0122] (1) The waste clothing (containing 69% cotton and 31% polyester) is crushed into shredded fabric with a particle size of 1mm to 3mm by the crusher 1. 300g of shredded fabric is fixed between the small screen 2021 and the large screen 2022 of the reaction tank 2.

[0123] (2) Add 1% sodium hydroxide solution to reaction tank 2 to immerse the shredded cloth between small filter screen 2021 and large filter screen 2022. Start electromagnetic stirrer 8, control the alkaline hydrolysis temperature at 30℃, the stirring speed at 150rpm, and the hydrolysis time at 1h. Then, squeeze the shredded cloth with small filter screen 2021 and large filter screen 2022 to obtain solid material and alkaline solution. Open the liquid outlet valve 204 with filter membrane at the front end to release the alkaline solution. Add clean water to wash the solid material of double-layer filter screen 202 multiple times until neutral. After testing, the composition of the neutral solid material obtained after washing is: cellulose 71.8%, hemicellulose 0.87%, and lignin 1.02%.

[0124] (3) Mix the washed solid material with water at a solid-liquid ratio of 1:10, adjust the pH of the mixture to 5.0 with 3% hydrochloric acid, add cellulase at 20 FPU / g solid material (dry weight), control the stirring speed of electromagnetic stirrer 8 to 150 rpm, and the saccharification temperature to 55℃. After saccharification for 72 hours, the saccharified liquid is obtained.

[0125] (4) Add 5% yeast liquid to the saccharification liquid by volume ratio, and use the reducing sugar in the saccharification liquid to carry out anaerobic fermentation to produce ethanol. Control the stirring speed of electromagnetic stirrer 8 to 150 rpm, the fermentation temperature to 37℃, and no pH adjustment is required. After fermentation to produce alcohol for 24 hours, the fermentation liquid is obtained, and the ethanol concentration in the fermentation liquid can reach 30.9 g / L.

[0126] (5) After the fermentation and alcohol production is completed, the fermentation liquid is discharged through the liquid outlet valve 204 with filter membrane at the front end. The residue on the large strainer 2022 is discharged from the reaction tank 2 by the hanging rope 203. It can be used as fuel, recycled polyester, chemical raw materials and building materials.

[0127] Example 4

[0128] The resource-based treatment method for used clothing of the present invention is carried out according to the following steps:

[0129] (1) The waste clothing (containing 69% cotton and 31% polyester) is crushed into shredded fabric with a particle size of 1mm to 3mm by the crusher 1. 300g of shredded fabric is fixed between the small screen 2021 and the large screen 2022 of the reaction tank 2.

[0130] (2) Add 1% sodium hydroxide solution to reaction tank 2 to immerse the shredded cloth between small mesh 2021 and large mesh 2022. Start electromagnetic stirrer 8, control the alkaline hydrolysis temperature at 120℃, the stirring speed at 150rpm, and the hydrolysis time at 1h. Then, squeeze the shredded cloth with small mesh 2021 and large mesh 2022 to obtain solid material and alkaline solution. Open the liquid outlet valve 204 with filter membrane at the front end to release the alkaline solution. Add clean water to wash the solid material of double-layer filter screen 202 multiple times until neutral.

[0131] (3) Mix the washed solid material with water at a solid-liquid ratio of 1:5, adjust the pH of the mixture to 5.0 with 3% hydrochloric acid, add cellulase at 20 FPU / g solid material (dry weight), control the stirring speed of electromagnetic stirrer 8 to 150 rpm, and the saccharification temperature to 55℃. After saccharification for 72 hours, the saccharified liquid is obtained.

[0132] (4) Add 10% yeast liquid to the saccharification liquid by volume ratio, and use the reducing sugar in the saccharification liquid to carry out anaerobic fermentation to produce ethanol. Control the stirring speed of the electromagnetic stirrer 8 to 150 rpm, the fermentation temperature to 37℃, and adjust the pH value of the fermentation liquid to 6 every 6 hours during the fermentation process. After 24 hours of fermentation to produce alcohol, the fermentation liquid is obtained, and the ethanol concentration in the fermentation liquid can reach 65.2 g / L.

[0133] (5) After the fermentation and alcohol production is completed, the fermentation liquid is discharged through the liquid outlet valve 204 with filter membrane at the front end. The residual material on the large strainer 2022 is discharged from the reaction tank 2 by the hanging rope 203. It can be used as fuel, recycled polyester, chemical raw materials and building materials.

[0134] Example 5

[0135] The resource-based treatment method for used clothing of the present invention is carried out according to the following steps:

[0136] (1) The waste clothing (containing 69% cotton and 31% polyester) is crushed into shredded fabric with a particle size of 1mm to 3mm by the crusher 1. 300g of shredded fabric is fixed between the small screen 2021 and the large screen 2022 of the reaction tank 2.

[0137] (2) Add 1% sodium hydroxide solution to reaction tank 2 to immerse the shredded cloth between small mesh 2021 and large mesh 2022. Start electromagnetic stirrer 8, control the alkaline hydrolysis temperature at 120℃, the stirring speed at 150rpm, and the hydrolysis time at 1h. Then, squeeze the shredded cloth with small mesh 2021 and large mesh 2022 to obtain solid material and alkaline solution. Open the liquid outlet valve 204 with filter membrane at the front end to release the alkaline solution. Add clean water to wash the solid material of double-layer filter screen 202 multiple times until neutral.

[0138] (3) Mix the washed solid material with water at a solid-liquid ratio of 1:5, adjust the pH of the mixture to 5.0 with 3% hydrochloric acid, add cellulase at 20 FPU / g solid material (dry weight), control the stirring speed of electromagnetic stirrer 8 to 150 rpm, and the saccharification temperature to 55℃. After saccharification for 72 hours, the saccharified liquid is obtained.

[0139] (4) Add 10% yeast liquid to the saccharification liquid by volume ratio, and use the reducing sugar in the saccharification liquid to carry out anaerobic fermentation to produce ethanol. Control the stirring speed of electromagnetic stirrer 8 to 150 rpm, the fermentation temperature to 37℃, and adjust the pH value of the fermentation liquid to 6 every 12 hours during the fermentation process. After 24 hours of fermentation to produce alcohol, the fermentation liquid is obtained, and the ethanol concentration in the fermentation liquid can reach 56.7 g / L.

[0140] (5) After the fermentation and alcohol production is completed, the fermentation liquid is discharged through the liquid outlet valve 204 with filter membrane at the front end. The residue on the large strainer 2022 is discharged from the reaction tank 2 by the hanging rope 203. It can be used as fuel, recycled polyester, chemical raw materials and building materials.

[0141] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for resource utilization by a waste clothing resource utilization device, the waste clothing resource utilization device comprising: a crushing feed unit comprising a crusher, a receiving hopper, and a feed pipe; a saccharification-alcohol production unit comprising a reaction tank and an electromagnetic stirrer; an algae cultivation-carbon fixation unit comprising a microalgae culture tank, a return pipe, and a lifting platform; the reaction tank is in communication with the microalgae culture tank through the return pipe; the reaction tank is placed at the lower part of the feed pipe, and comprises a first sealing cover, a double-layered screen, a screen hanging rope, a front-end liquid outlet valve with a filter membrane, an air outlet hole, and a hook; the first sealing cover is located at the top of the reaction tank; the small screen and the large screen are hung on the tank wall of the reaction tank through the screen hanging rope and the hook; the height of the double-layered screen in the reaction tank is determined by adjusting the length of the screen hanging rope; the air outlet hole is located at the middle part of the reaction tank; and the liquid outlet valve is located at the lower part of the reaction tank. The method comprises the following steps: (1) crushing the waste clothing into cloth fragments with a particle size of 1 mm to 3 mm by the crusher, and fixing the cloth fragments between the small screen and the large screen in the reaction tank; (2) adding alkali solution into the reaction tank to immerse the cloth fragments fixed between the small screen and the large screen in the reaction tank, starting the electromagnetic stirrer, controlling the alkaline hydrolysis temperature at 100-120℃, the stirring speed at 150-180 rpm, and the hydrolysis time at 1-2 h, then extruding the cloth fragments with the small screen and the large screen to obtain solid-phase materials and waste liquid, opening the front-end liquid outlet valve with the filter membrane to discharge the waste liquid, and washing the solid-phase materials with water multiple times until neutralization; (3) adding water to the neutralized solid-phase materials at a solid-liquid ratio of 1:5-1:20 to obtain a mixed solution, adjusting the pH of the mixed solution to 4.0-6.0, adding cellulase according to 4-30 FPU / g of the solid-phase materials, controlling the stirring speed of the electromagnetic stirrer at 150-180 rpm, the saccharification temperature at 50-60℃, and the saccharification time at 48-90 h to obtain a saccharification liquid; (4) adding 1-12% (v / v) of yeast liquid to the saccharification liquid, controlling the stirring speed of the electromagnetic stirrer at 150-180 rpm, the fermentation temperature at 35-37℃, and the alcohol production time at 18-72 h to obtain a fermentation liquid; (5) opening the front-end liquid outlet valve with the filter membrane to discharge the fermentation liquid, and using the large screen to retain the residues in the fermentation liquid, then pulling the large screen through the screen hanging rope to discharge the residues from the reaction tank for subsequent reuse. The carbon dioxide gas produced in step (4) is sent to the microalgae culture tank inoculated with microalgae, and the microalgae absorb the carbon dioxide under photosynthesis, and the tail gas is absorbed by the carbon dioxide absorption pool at the end of the gas outlet pipe; when the microalgae in the microalgae culture tank accumulate to 9.9×10 7 CFU / mL-2.15×10 8 CFU / mL, the solution in the reaction tank is emptied, and the algae liquid is returned to step (2) of the reaction tank for continuous reaction. 2.The method of claim 1, wherein the crusher comprises a feed inlet, a transmission gear, a crushing cutter, and a motor; the receiving hopper is placed at the lower part of the crushing cutter of the crusher to receive the crushed cloth fragments; and the upper end of the feed pipe is connected to the lower end of the receiving hopper. 3.The method of claim 1, wherein the reaction tank is placed on the electromagnetic stirrer. 4.The method of claim 1, wherein the small screen is placed inside the large screen; the mesh diameter of the small screen is 20-40 mesh; and the mesh diameter of the large screen is 20-40 mesh. 5.The method of claim 1, wherein the microalgae culture tank is provided with a second sealing cover, an air outlet pipe, an LED lamp tube, a spiral pipe, and an air inlet hole.

6. The method of claim 5, wherein the second sealing cover is located at the top of the microalgae culture tank, the air outlet pipe is located at the top of the second sealing cover, the LED lamp tube is connected to the second sealing cover at the upper end and hung in the middle of the microalgae culture tank, the air inlet hole is located at the lower part of the microalgae culture tank, and the spiral pipe is connected to the air inlet hole and placed at the lower part of the microalgae culture tank.

7. The method of claim 5, wherein the spiral pipe is provided with a plurality of small holes at the top, and the diameter of the holes is 10-15 mm.

8. The method of claim 1, wherein the first sealing connection cover is connected to the air outlet hole of the reaction tank, the second sealing connection cover is connected to the air inlet hole of the microalgae culture tank, and the reflux pipe is connected to the first sealing connection cover and the second sealing connection cover.

9. The method of claim 1, further comprising a mobile trolley for carrying each unit device and transferring as a whole.

10. The method of claim 1, wherein the crushing feed unit is placed on the upper layer of the mobile trolley, and the saccharification-alcohol production unit and the algae cultivation-carbon sequestration unit are placed on the lower layer of the mobile trolley.

11. The method of claim 1, wherein the microalgae culture tank is placed on a lifting platform, and the lifting platform is used to lift the microalgae culture tank to make the algae liquid in the barrel flow back into the reaction tank through the reflux pipe.

12. The method of claim 1, wherein in step (1), the waste clothes are cotton-polyester blended waste clothes.

13. The method of claim 1, wherein in step (1), the waste clothes contain more than 50% of cotton.

14. The method of claim 13, wherein in step (1), the waste clothes contain 50-70% of cotton.

15. The method of claim 14, wherein in step (1), the waste clothes contain 30-50% of polyester.

16. The method of claim 1, wherein in step (1), the waste liquid is reused in the reaction tank.

17. The method of claim 1, wherein in step (2), the mass concentration of the alkali solution is 1-5%.

18. The method of claim 1, wherein in step (3), the acid for adjusting the pH value includes any one or a combination of hydrochloric acid, phosphoric acid, and malic acid.

19. The method of claim 1, wherein in step (3), the pH of the mixed solution is adjusted to 4.5-5.

0.

20. The method of claim 1, wherein in step (3), the cellulase is added at 8-20 FPU / g of solid material.

21. The method of claim 20, wherein in step (3), the cellulase is added at 16-20 FPU / g of solid material.

22. The method of claim 1, wherein in step (4), 5-10% (v / v) of the yeast solution is added to the saccharification solution.

23. The method of claim 1, wherein in step (4), the preparation method of the yeast solution is as follows: a certain amount of Angelus Saccharomyces cerevisiae dry powder is weighed and added to a sterilized 2% (w / v) sucrose solution at a solid-liquid ratio of 1:50-60, and activated for 30 min to obtain the yeast solution.

24. The method of claim 1, wherein in step (4), the pH of the fermentation solution is adjusted to 5.5-6.0 every 6-12 h.

25. The method of claim 1, wherein the residual is used as fuel, regenerated polyester, chemical raw material and building material in step (5).

26. The method of claim 1, wherein the backflow ratio of the algal liquid is 10-30%.

27. The method of claim 1, wherein the temperature for cultivating the algae is 20-35°C.

28. The method of claim 1, wherein the residual liquid after extracting ethanol from the ethanol fermentation liquid is added to the microalgae culture tank as the nutrient liquid for cultivating the algae.

29. The method of claim 1, wherein the carbon dioxide absorption tank contains a solid absorbent.

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