Method and device for preparing straw-based super absorbent resin for solidifying / stabilizing rural feces

Abstract

The invention discloses a preparation method and device of straw-based super absorbent resin for curing / stabilizing rural manure, and relates to the technical field of manure treatment, and the preparation method specifically comprises the following steps: step (a), selecting raw materials for synthesizing super absorbent resin, and adding the raw materials into a treatment tank; (b) initiating the raw materials in the treatment tank in the step (a), and adding an initiator, a hydrophilic monomer and a cross-linking agent to prepare straw-based super absorbent resin; the raw materials of the super absorbent resin are selected from wheat straws and highland barley straws; the initiation preparation mode is selected from thermal initiation and ultraviolet initiation; the initiator is selected from potassium persulfate and benzoin dimethyl ether. According to the preparation method and device of the straw-based super absorbent resin, the time for curing rural manure is shortened, the moisture content in the manure can be effectively controlled, meanwhile, the wettability is evaluated, the transportation feasibility is indirectly illustrated, leakage harm to the environment is avoided, stable and uniform-speed material conveying can be achieved, and subsequent processing is facilitated; the raw materials can be cut off and scattered, and the subsequent treatment effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of manure treatment, and in particular to a method and a device for preparing a straw-based highly absorbent resin for solidifying / stabilizing rural manure. Background Art

[0002] Livestock and poultry farming is an important agricultural industry in my country. It can not only increase profits, but also provide meat products for people and provide raw materials for the food industry. However, with the increase in the number of livestock and poultry, the amount of manure and urine discharged is also increasing. Direct discharge will cause serious pollution to the environment and affect the health and growth of livestock and poultry. Therefore, scientific and reasonable treatment of manure and urine has become an important link in ensuring livestock and poultry production and environmental safety.

[0003] In the prior art, it is difficult to collect decentralized rural manure and sewage in a unified pipeline, and it is often necessary to collect them by suction trucks and other means before resource processing. Before resource utilization, the moisture content needs to be further controlled. Traditional methods of controlling moisture content such as mechanical separation and adding chemical reagents occupy a large area, take a long time to process, have uncontrollable impacts on the environment, and increase the transportation load. To this end, we propose a method and device for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a method and device for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure, which specifically comprises the following steps:

[0006] Step (a): Selecting raw materials for synthesizing super absorbent resin and adding them into a treatment tank;

[0007] Step (b): initiating the raw materials in the processing tank in step (a), and adding an initiator, a hydrophilic monomer and a cross-linking agent to prepare a straw-based super absorbent resin.

[0008] The raw material of the super absorbent resin is selected from wheat straw and highland barley straw;

[0009] The initiation preparation method is selected from thermal initiation and ultraviolet light initiation;

[0010] The initiator is selected from potassium persulfate and benzoin dimethyl ether;

[0011] The hydrophilic monomer is selected from acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid;

[0012] The cross-linking agent is selected from N,N-methylenebisacrylamide.

[0013] Furthermore, in step (b), the amounts of wheat straw under thermal initiation and ultraviolet light initiation are 2 g and 0.5 g respectively, the amounts of highland barley straw are 1.5 g and 0.5 g respectively, the mass ratio of hydrophilic monomers is 6:1, the thermal initiation polymerization temperature is 80°C, and the exposure time under ultraviolet light initiation is 10 min.

[0014] Further, in step (b):

[0015] When prepared based on wheat straw as raw material, the degree of neutralization of acrylic acid under thermal initiation and UV initiation was 70% and 75%, respectively;

[0016] When prepared based on highland barley straw as raw material, the neutralization degree of acrylic acid under thermal initiation and UV light initiation was 70% and 65% respectively.

[0017] Furthermore, the amounts of the thermal initiator and the photoinitiator are 0.8 g and 0.006 g, respectively. Under the two initiators, the amounts of crosslinking in the preparation based on wheat straw are 0.012 g and 0.003 g, and the amounts of crosslinking in the preparation based on highland barley straw are 0.013 g and 0.003 g, respectively.

[0018] A preparation device for straw-based highly absorbent resin for solidifying / stabilizing rural excrement comprises a processing tank, wherein a feeding port and a feed inlet are arranged on the processing tank, and a cutting device and a feeding device are arranged in the feed inlet.

[0019] Furthermore, the cutting device is used to cut the raw material of the super absorbent resin input by the feeding device, and the feeding device is used to input the raw material of the super absorbent resin into the feed port.

[0020] Furthermore, the cutting device includes a bracket arranged on the inner wall of the feed port, a cutting knife is rotatably provided on the bracket, the cutting knife is connected to a motor for driving the cutting knife to rotate, and a baffle is provided on the top of the motor for assisting the raw material of the super absorbent resin to slide to the cutting knife.

[0021] Furthermore, the feeding device includes a support shaft rotatably arranged on a feed port above the cutting device, and the support shaft is connected to a feeding roller for feeding.

[0022] Furthermore, the bracket is an elliptical cylindrical structure, the long semi-axis of the bracket is smaller than the radius of the feed port, the cutting knife consists of a blade and a rotating shaft, the cutting knife rotating shaft is rotatably clamped on the bracket, the output end of the motor is connected to one end of the cutting knife rotating shaft, and the motor is installed on the bracket.

[0023] Furthermore, the support shaft and the feeding roller are each provided with two groups, one end of the support shaft rotates through the side wall of the feed port and is connected to a motor for driving the support shaft to rotate, and the support shaft is used to drive the feeding roller to rotate.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. After curing with super absorbent resin, the rate of moisture reduction is much higher than that of natural drying; super absorbent resin can control moisture content by absorbing water molecules in feces; super absorbent resin with better swelling performance has a larger surface area and porosity due to its microstructure, more uniform pore distribution, and faster curing speed; compared with natural drying, super absorbent resin can significantly improve the curing effect; at the same time, feces have a certain tolerance after curing, and the odor is reduced, meeting the requirements of transportation; curing agent with strong water absorption performance can absorb and solidify the moisture in feces more quickly, accelerate the curing process, reduce moisture content, and increase capacity The ratio increases accordingly; as a three-dimensional network polymer, super absorbent resin reacts with water, metal ions and organic matter in manure and sewage through a large number of hydrophilic groups such as carboxyl, hydroxyl and sulfonic acid groups carried by itself during the manure solidification process, and slowly transforms into a stable gel, thereby fixing the water in rural manure and sewage; after 96 hours of solidification, the manure and sewage has changed from a fluid state to a non-fluid state and has a certain plasticity; compared with traditional drying and mechanical separation treatments, the solidification treatment time is shortened, the water content in manure and sewage can be effectively controlled, and the wettability is evaluated at the same time, which indirectly indicates the feasibility of transportation and will not cause leakage hazards to the environment.

[0026] 2. Put the raw materials in from above the two sets of feeding rollers, start the motor to drive the support shaft to rotate, the support shaft drives the feeding roller to rotate, and the feeding roller rotates to transport the raw materials downward to the feed port, so that the material can be fed at a stable and uniform speed, which is convenient for subsequent processing.

[0027] 3. Start the motor, which drives the cutting blade to rotate. The raw materials conveyed downward by the feeding device contact the rotating cutting blade, are cut and broken up, and fall into the processing tank, so that the raw materials can be cut and broken up, thereby improving the subsequent processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a preparation device for the straw-based super absorbent resin used for solidifying / stabilizing rural manure and sewage in the present invention;

[0029] Figure 2 It is a schematic structural diagram of the cutting device in the preparation device of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0030] Figure 3It is a structural schematic diagram of the feeding device in the preparation device of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0031] Figure 4 It is a schematic diagram of SAP1 (WS) in the preparation method of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0032] Figure 5 It is a schematic diagram of SAP2 (WS) in the preparation method of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0033] Figure 6 It is a schematic diagram of the optimal synthesis conditions of wheat straw based on SAP in the preparation method of straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0034] Figure 7 It is a schematic diagram of SAP1 (BS) in the preparation method of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0035] Figure 8 It is a schematic diagram of SAP2 (BS) in the preparation method of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0036] Fig. 9 It is a schematic diagram of the optimal synthesis conditions of highland barley straw-based SAP in the preparation method of the straw-based super absorbent resin for solidifying / stabilizing rural excrement and sewage of the present invention;

[0037] Fig.10 It is a schematic diagram of the change of the moisture content of rural manure and sewage under the conditions of adding super absorbent resin and natural drying in the preparation method of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0038] Fig.11 It is a schematic diagram of the volume increase ratio of rural cow dung and sewage after adding super absorbent resin and curing under natural drying conditions for 24 hours in the preparation method of straw-based super absorbent resin for curing / stabilizing rural dung and sewage of the present invention;

[0039] Fig.12 It is a schematic diagram of the wettability of adding super absorbent resin in the preparation method of straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage and solidifying rural cow manure and sewage for 48 hours under natural drying conditions;

[0040] Fig.13 It is a schematic diagram of the synthesis mechanism of wheat straw under thermal initiation and ultraviolet light initiation in the preparation method of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0041] Fig.14It is a schematic diagram of the structure of a UV polymerization device in the method for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention;

[0042] Fig.15 It is a schematic diagram of the absorption curve of DMPA under ultraviolet light and the initiation mechanism in the preparation method of the straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage of the present invention.

[0043] In the figure: 1. Processing tank; 2. Feeding port; 3. Feeding port; 4. Cutting device; 5. Feeding device; 6. Voltage stabilizer; 7. Water cooling mechanism; 8. Mercury lamp; 9. Cooling fan; 10. Lifting platform;

[0044] 41. bracket; 42. cutting knife; 43. motor; 44. baffle;

[0045] 51. Support shaft; 52. Feeding roller. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] A method for preparing a straw-based superabsorbent resin for solidifying / stabilizing rural manure and sewage, specifically comprising the following steps:

[0048] Step (a): Selecting raw materials for synthesizing super absorbent resin and adding them into a treatment tank;

[0049] Step (b): initiating the raw materials in the processing tank in step (a), and adding an initiator, a hydrophilic monomer and a crosslinking agent to prepare a straw-based super absorbent resin; the amount of wheat straw under thermal initiation and ultraviolet light initiation is 2g and 0.5g respectively, the amount of highland barley straw is 1.5g and 0.5g respectively, the mass ratio of hydrophilic monomers is 6:1, the thermal initiation polymerization temperature is 80°C, and the exposure time under ultraviolet light initiation is 10min; when preparing based on wheat straw as raw material, under thermal initiation The neutralization degree of acrylic acid under thermal and UV light initiation is 70% and 75% respectively. When prepared based on highland barley straw as raw material, the neutralization degree of acrylic acid under thermal initiation and UV light initiation is 70% and 65% respectively. The amounts of thermal initiator and photoinitiator are 0.8g and 0.006g respectively. Under both initiations, the cross-linking amount in the preparation based on wheat straw is 0.012g and 0.003g, and the cross-linking amount in the preparation based on highland barley straw is 0.013g and 0.003g respectively.

[0050] The raw materials of the super absorbent resin are selected from wheat straw and highland barley straw; the initiation preparation method is selected from thermal initiation and ultraviolet light initiation; the initiator is selected from potassium persulfate and benzoin dimethyl ether; the hydrophilic monomer is selected from acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid; and the crosslinking agent is selected from N,N-methylenebisacrylamide.

[0051] Preparation of wheat straw-based superabsorbent resin under different initiation methods

[0052] (1) Thermal initiation

[0053] Take a certain amount of wheat straw raw material (1.5g is added to a 100mL beaker, and 15L of distilled water is added as a dispersing solvent. It is placed in an 80℃ water bath and heated and stirred continuously for 10min to activate. Then potassium persulfate (0.8g) is added and stirred continuously for 2min to generate active free radicals. Then 20mL of a monomer solution with a certain degree of neutralization (acrylic acid: 2-acrylamido-2-methylpropanesulfonic acid = 6:1) is added. Finally, a cross-linking agent N,N-methylenebisacrylamide (0.012g) is added and stirred continuously until a gel appears accompanied by a climbing pole phenomenon. The gel is taken out and cooled to room temperature and rinsed with distilled water. It is then placed in anhydrous ethanol for 16h, and the ethanol is replaced every 8h to remove moisture and monomer homopolymers. Finally, the polymer is placed in an oven at 80℃ and dried to constant weight to obtain a highly absorbent resin (Heat-WS (SAP)) prepared by thermal initiation of wheat straw. The synthesis mechanism is shown in the figure below. Fig.13 shown.

[0054] (2) Ultraviolet (UV) light initiation

[0055] A certain amount of wheat straw raw material (0.5 g) was added into a beaker, and 10 mL of distilled water was added as a solvent. The light-initiating agent a, a-dimethoxy-a-phenylacetophenone (0.06 g) was weighed and dissolved in a monomer solution (acrylic acid: 2-acrylamido-2-methylpropanesulfonic acid = 6:1). Then, the wheat straw raw material solution was added into the monomer solution and mixed evenly. Then, a cross-linking agent N, N-methylenebisacrylamide (0.003 g) was added, stirred evenly, and poured into a culture dish. The mixture was placed under an ultraviolet polymerization device. Benzoin dimethyl ether produced a small volume of methyl (CH3·) free radicals under ultraviolet light to induce the graft polymerization of hydrophilic monomers (such as Fig.15 After 10 min of reaction, a flake product was obtained, which was washed with distilled water and then placed in anhydrous ethanol for 16 h. The ethanol was replaced every 8 h to remove the monomer homopolymer. Finally, the polymer was placed in an oven at 80°C and dried to constant weight to obtain a super absorbent resin (UV-WS (SAP)) prepared by wheat straw under ultraviolet light initiation.

[0056] like Fig.14As shown, the ultraviolet polymerization device includes a shell (not numbered in the accompanying drawings), a lifting platform 10 is provided at the bottom of the shell, a mercury lamp 8 is provided at the top of the shell above the lifting platform 10 and is used to adjust the distance between the mixture and the mercury lamp 8, so as to facilitate the selection of the irradiation distance that can achieve the best performance, the mercury lamp 8 is connected to a voltage stabilizer 6 for making the mercury lamp 8 work normally under the rated voltage, a water cooling mechanism 7 and a heat dissipation fan 9 are provided on the shell to reduce the temperature in the initiation environment, so that the UV polymerization device is maintained at room temperature, and thermal initiation caused by excessive temperature is avoided, thereby affecting the ultraviolet light initiation; the shell is a hard material that can isolate ultraviolet light, and the mercury lamp 8 is a high-pressure mercury lamp that can release ultraviolet light with a main wavelength of 365nm and a wavelength range of 200-400nm, which can be absorbed by dimethyl benzoate.

[0057] Preparation of highland barley straw-based SAP under different initiation methods

[0058] (1) Thermal initiation

[0059] A certain amount of highland barley straw raw material (1.5 g) was weighed and added into a 10 mL beaker. 15 mL of distilled water was added as the dispersion solvent. The mixture was heated in a water bath at 80 °C and stirred for 10 min. Potassium persulfate (0.8 g) was then added and stirred for 2 min to generate persulfate (SO 4 ·Active self-radical. Weigh a certain proportion of acrylic acid and 2-acrylamido-1-methylpropanesulfonic acid in a beaker and add distilled water to dissolve them. Add a certain amount of sodium hydroxide to neutralize the acrylic acid and the carboxyl group to prepare a monomer solution with a certain degree of neutralization. Add the monomer solution to the above system and stir for 2 minutes, then finally add the crosslinking agent N, N-methylenebisacrylamide (0.013g), and continue stirring until gel appears accompanied by climbing poles. Take out the gel, cool it to room temperature, rinse it with distilled water, and then place it in anhydrous ethanol for 16 hours. Replace ethanol every 8 hours to remove the homopolymer produced by monomer self-polymerization. Finally, place the polymer in an oven at 80°C and dry it to constant weight to obtain a highly absorbent resin based on highland barley straw (Heat-HBS (SAP)) under thermal initiation.

[0060] (2) Ultraviolet (UV) light initiation

[0061] Weigh a certain amount of highland barley straw raw material (0.5g) and add it to a beaker, add 10mL of distilled water to disperse the highland barley straw powder, weigh benzoin dimethyl ether (0.06g) and dissolve it in the prepared monomer solution (acrylic acid: 2-acrylamide-2-methylpropanesulfonic acid = 6:1), then add a solution with a certain degree of neutralization and containing benzoin dimethyl ether to the highland barley straw raw material solution and mix evenly, then add a crosslinking agent N, N-methylenebisacrylamide (0.003g) to the mixture, stir evenly and pour it into a petri dish. The mixture is placed under a UV polymerization device, during which benzoin dimethyl ether absorbs ultraviolet light to generate active free radicals (reference Fig.15 , where the curve wavelength range is 300-400nm), thereby inducing graft copolymerization of cellulose chains and monomers. After 10 minutes of reaction, a flaky product is obtained, which is rinsed with distilled water and then placed in anhydrous ethanol for 16 hours. The ethanol is replaced every 8 hours to remove water, homopolymers such as acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid. Finally, the polymer is placed in an oven at 80°C and dried to constant weight to obtain a highly absorbent resin based on green straw (UV-HBS (SAP)) initiated by ultraviolet light.

[0062] Experimental Example 1

[0063] The experiment set up 4 treatments.

[0064] Treatment 1: Four new straw-based superabsorbent resins with different liquid absorption properties were prepared as curing agents, see Table 1, where SAP1 (WS) and SAP2 (WS) were prepared using wheat straw as raw material under different initiation methods; SAP1 (BS) and SAP2 (BS) were prepared using highland barley straw as raw material under different initiation methods. The maximum liquid absorption rate was obtained by optimizing the synthesis conditions.

[0065] Treatment 2: Take 5 portions of 100 mL of rural manure mixture with a moisture content of 95-98% and place them in a beaker, weigh 1 g of each of the four super absorbent resins and wrap them in a tea bag, then place the wrapped super absorbent resin in the beaker containing manure, set it as the control group under natural drying conditions, and observe the curing effect over time for one week.

[0066] Treatment 3: Test the moisture content of manure by gravimetric method every 20 hours for 4 days. Fig.10 .

[0067] Treatment 4: After 24 hours of curing, the volume increase ratio was analyzed by the volume change before and after curing and the density of feces (the feces can be selected from any one or more mixtures of rural feces such as cow dung and sheep dung, and the feces in this treatment are cow dung), and the advantages of super absorbent resin in reducing the amount of cow dung in curing treatment were obtained. The results are shown in the attached Fig.11 .

[0068] Treatment 5: Evaluation of the permeability and wettability of the implementation case after 48 hours of curing by capillary water absorption time, see the attached Fig.12 , considering the feasibility in long-distance transportation and short-term storage.

[0069] Table 1 shows the absorption properties of four super absorbent resins in distilled water

[0070]

[0071] In Table 1, SAP1 (WS) is a super absorbent resin made from wheat straw by thermal initiation under optimal synthesis conditions, SAP2 (WS) is a super absorbent resin made from wheat straw by ultraviolet light initiation under optimal synthesis conditions, SAP1 (BS) is a super absorbent resin made from highland barley straw by thermal initiation under optimal synthesis conditions, and SAP2 (BS) is a super absorbent resin made from highland barley straw by ultraviolet light initiation under optimal synthesis conditions; wherein, WS is wheat straw, BS is highland barley straw, and BS are English abbreviations; 1 represents a thermal initiation environment, and 2 represents a light initiation environment.

[0072] Combination Figure 4-9 , Figure 6 WSC in the middle is pretreated wheat straw. Fig. 9 HBSC in the middle is pretreated highland barley straw. It can be seen that within a certain period of curing, the change in moisture content of manure was tested by weight method every 20 hours for 4 days. After the fourth day, the moisture content of manure with the addition of super absorbent resin had been greatly reduced. The change in moisture content after the fourth day could no longer explain the stabilization effect. Then, the wettability and pressure resistance analysis were carried out. Compared with the natural drying (CK) control group, the volume expansion ratio of manure with SAP added was significantly improved after 24 hours. This is because the super absorbent resin has strong water absorption capacity. On the one hand, it reacts with the water in the manure to convert into bound water. On the other hand, the water is evaporated by natural drying, and the structural stability of the solidified body will not be destroyed. Therefore, its volume expansion ratio is increased after curing by adding super absorbent resin.

[0073] Among them, some evaluation indicators such as water content are analyzed over time, wettability is indirectly evaluated by capillary absorption time, and the treatment process complies with the dry cleaning waste collection technology in the "Guidelines for Harmless Treatment and Resource Utilization of Rural Toilet Sewage" and "Technical Policy for Pollution Prevention and Control in Livestock and Poultry Farming".

[0074] Evaluation method: The pressure resistance is mainly evaluated through fluidity observation and the shaping by simple pressing. The manure solidification treatment is evaluated through the volume change before and after solidification and the change in the volume increase ratio of manure density analysis. Among them, the pressure resistance is mainly evaluated and analyzed through fluidity observation and simple pressing, which is in line with the resource comprehensive utilization method in the "Technical Policy on Pollution Prevention and Control in Livestock and Poultry Farming". At the same time, with reference to relevant literature, it is explained that there is no unified standard for the pressure resistance of manure.

[0075] Super absorbent resin can achieve the purpose of controlling moisture content by absorbing water molecules in manure. Compared with other experimental groups, SAP2 (BS) is more significant in controlling the moisture content of rural cow dung and the rate of moisture reduction is faster. This is because SAP2 (BS) has better swelling properties. At the same time, its micromorphology shows a larger surface area and porosity, and the pore distribution is more uniform. After curing for 72 hours, the experimental groups with super absorbent resin SAP1 (WS), SAP2 (WS), SAP1 (BS) and SAP2 (BS) respectively reduced their moisture content by 19%, 24%, 12% and 30% compared with the CK control group. The rate of decrease in the moisture content of manure is positively correlated with the water absorption capacity of super absorbent resin. Among them, the moisture content of rural manure with SAP1 (WS), SAP2 (WS) and SAP2 (BS) dropped to 60% in 72 hours, which met the control standard.

[0076] Combination Figure 10-12 It can be seen that compared with the CK group, the capillary water absorption time after natural drying treatment is 355s, and the capillary water absorption time is greatly increased after 48 hours of treatment with super absorbent resin. The reason is that the super absorbent resin can absorb a large amount of water in the feces in a short time and is itself in a gel state, which slows down the movement of water in the feces, thereby increasing the time required for water to diffuse a certain distance, that is, the capillary water absorption time increases; that is, it can solidify the fluid water in the feces in a short time, greatly reducing the water content and wettability in the feces to make it plastic, providing subsequent transportation management and resource recycling.

[0077] By adding super absorbent resin to the feces and sewage after solidification for 96 hours, compared with natural drying, the solidified feces and sewage with super absorbent resin have significantly reduced odor, can be shaped and have good tolerance.

[0078] Test Example 2

[0079] The experiment has two treatments.

[0080] Treatment 1: Place a mixture of high-water content cow dung and domestic waste (such as sawdust) in a beaker, weigh 1g of each of the highly absorbent resins SAP1(WS), SAP2(WS), SAP1(BS) and SAP2(BS) and wrap them in tea bags, place the tea bags containing the four highly absorbent resins in a beaker containing the domestic waste mixture, and observe the curing and stabilization effects;

[0081] Treatment 2: The moisture content and wettability were evaluated using the evaluation method of Example 1.

[0082] The manure-sewage mixture with the addition of new highly absorbent resin changes from a fluid state to a non-fluid state in a short period of time and has a certain plasticity. Due to the water absorption properties of sawdust and absorbent resin, its capillary water absorption time is greatly extended, meeting the pollutant treatment standards. At the same time, the odor is effectively suppressed, creating conditions for subsequent resource utilization.

[0083] After curing with super absorbent resin, the rate of moisture content reduction is much higher than that of natural drying; super absorbent resin can control moisture content by absorbing water molecules in feces; super absorbent resin with better swelling performance shows larger surface area and porosity in its microscopic morphology, more uniform pore distribution, and faster curing speed; compared with natural drying, super absorbent resin can significantly improve the curing effect; at the same time, feces have a certain tolerance after curing, and the odor is reduced, meeting the requirements of transportation; curing agent with strong water absorption performance can absorb and solidify the moisture in feces more quickly, accelerate the curing process, reduce moisture content, and increase the volume expansion ratio accordingly; as a three-dimensional network polymer, super absorbent resin can absorb and solidify the moisture in feces through the large number of hydrophilic groups it carries, such as carboxyl, hydroxyl and sulfonic acid groups, during the curing process of feces , metal ions and organic matter react and slowly transform into a stable gel, thereby fixing the water content in rural manure; after 96 hours of solidification, the manure has changed from a fluid state to a non-fluid state and has a certain plasticity; compared with traditional drying and mechanical separation treatments, the solidification time is shortened, the water content in the manure can be effectively controlled, and the wettability is evaluated at the same time, which indirectly indicates the feasibility of transportation and will not cause leakage hazards to the environment (this method is used to further control the water content of manure, and the feasibility of dry transportation is evaluated by wettability. The traditional manure transportation has a high water content and high requirements for suction trucks, and the objects of action are mostly manure without any treatment. This method is embodied in controlling wettability and odor, reducing transportation requirements, and naturally complies with the "Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Wastes").

[0084] A preparation device for straw-based highly absorbent resin for solidifying / stabilizing rural excrement comprises a treatment tank 1, the treatment tank 1 is provided with a feed port 2 and a feed port 3, and the feed port 3 is provided with a cutting device 4 and a feeding device 5.

[0085] The feeding device 5 is used to input the raw material of the super absorbent resin into the feed port 3. The feeding device 5 includes a support shaft 51 that is rotatably arranged on the feed port 3 above the cutting device 4. The support shaft 51 is connected to a feeding roller 52 for feeding. The support shaft 51 and the feeding roller 52 are each provided with two groups. One end of the support shaft 51 rotates and penetrates the side wall of the feed port 3 and is connected to a motor for driving the support shaft 51 to rotate. The motor is arranged on the outer wall of the feed port 3, and the support shaft 51 is used to drive the feeding roller 52 to rotate.

[0086] The raw material of super absorbent resin (hereinafter referred to as raw material) is put in from above two groups of feeding rollers 52, and the motor is started to drive the support shaft 51 to rotate. The support shaft 51 drives the feeding roller 52 to rotate, and the feeding roller 52 rotates to transport the raw material downward to the feed port 3, so that the material can be fed at a stable and uniform speed, which is convenient for subsequent processing.

[0087] The cutting device 4 is used to cut the raw materials of the super absorbent resin input by the feeding device 5. The cutting device 4 includes a bracket 41 arranged on the inner wall of the feed port 3. A cutting knife 42 is rotatably provided on the bracket 41. The cutting knife 42 is connected to a motor 43 for driving the cutting knife 42 to rotate. A baffle 44 is provided on the top of the motor 43 to assist the raw materials of the super absorbent resin to slide to the cutting knife 42. The bracket 41 is an elliptical cylindrical structure. The long semi-axis of the bracket 41 is smaller than the radius of the feed port 3 to avoid affecting the raw materials of the super absorbent resin from contacting the cutting knife 42. The cutting knife 42 consists of two parts: a blade and a rotating shaft. The rotating shaft of the cutting knife 42 is rotatably clamped on the bracket 41. The output end of the motor 43 is connected to one end of the rotating shaft of the cutting knife 42. The motor 43 is installed on the bracket 41.

[0088] The motor 43 is started, and the motor 43 drives the cutting knife 42 to rotate. The raw materials conveyed downward by the feeding device 5 contact the rotating cutting knife 42, are cut and broken up, and fall into the processing tank 1, so that the raw materials can be cut and broken up, thereby improving the subsequent processing effect.

[0089] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a straw-based superabsorbent resin for solidifying / stabilizing rural manure, characterized in that: The specific steps include: Step (a): Selecting raw materials for synthesizing super absorbent resin and adding them into a treatment tank; Step (b): initiating the raw materials in the processing tank in step (a), and adding an initiator, a hydrophilic monomer and a cross-linking agent to prepare a straw-based super absorbent resin. The raw material of the super absorbent resin is selected from wheat straw and highland barley straw; The initiation preparation method is selected from thermal initiation and ultraviolet light initiation; The initiator is selected from potassium persulfate and benzoin dimethyl ether; The hydrophilic monomer is selected from acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid; The cross-linking agent is selected from N,N-methylenebisacrylamide.

2. The method for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to claim 1, characterized in that: In step (b), the amounts of wheat straw under thermal initiation and ultraviolet light initiation were 2 g and 0.5 g, respectively, and the amounts of highland barley straw were 1.5 g and 0.5 g, respectively, and the mass ratio of hydrophilic monomers was 6:

1.

3. The method for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to claim 1, characterized in that: In step (b): When prepared based on wheat straw as raw material, the degree of neutralization of acrylic acid under thermal initiation and UV initiation was 70% and 75%, respectively; When prepared based on highland barley straw as raw material, the neutralization degree of acrylic acid under thermal initiation and UV light initiation was 70% and 65% respectively.

4. The method for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to claim 1, characterized in that: The amounts of the thermal initiator and the photoinitiator are 0.8 g and 0.006 g, respectively. Under the two initiators, the amounts of crosslinking in the preparation based on wheat straw are 0.012 g and 0.003 g, and the amounts of crosslinking in the preparation based on highland barley straw are 0.013 g and 0.003 g, respectively.

5. A preparation device for a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to any one of claims 1 to 4, comprising a treatment tank (1), characterized in that: The processing tank (1) is provided with a feeding port (2) and a feed port (3), and the feed port (3) is provided with a cutting device (4) and a feeding device (5).

6. The device for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to claim 5, characterized in that: The cutting device (4) is used to cut the raw material of the super absorbent resin input by the feeding device (5), and the feeding device (5) is used to input the raw material of the super absorbent resin into the feed port (3).

7. The device for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to claim 6, characterized in that: The cutting device (4) comprises a bracket (41) arranged on the inner wall of the feed port (3); a cutting knife (42) is rotatably arranged on the bracket (41); the cutting knife (42) is connected to a motor (43) for driving the cutting knife (42) to rotate; a baffle (44) is arranged on the top of the motor (43) for assisting the raw material of the super absorbent resin to slide to the cutting knife (42).

8. The preparation device of a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to claim 6, characterized in that: The feeding device (5) comprises a support shaft (51) rotatably arranged on a feed port (3) above the cutting device (4), and the support shaft (51) is connected to a feeding roller (52) for feeding.

9. The device for preparing a straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to claim 7, characterized in that: The support (41) is an elliptical cylindrical structure, the long semi-axis of the support (41) is smaller than the radius of the feed port (3), the cutting knife (42) is composed of a blade and a rotating shaft, the rotating shaft of the cutting knife (42) is rotatably clamped on the support (41), the output end of the motor (43) is connected to one end of the rotating shaft of the cutting knife (42), and the motor (43) is mounted on the support (41).

10. The preparation device of straw-based super absorbent resin for solidifying / stabilizing rural manure and sewage according to claim 8, characterized in that: The support shaft (51) and the feeding roller (52) are each provided with two groups, one end of the support shaft (51) rotates through the side wall of the feed port (3) and is connected to a motor for driving the support shaft (51) to rotate, and the support shaft (51) is used to drive the feeding roller (52) to rotate.

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