Preparation method of compound enzyme cured sludge and fly ash mixed material

Abstract

The invention relates to the technical field of preparation of road engineering materials, in particular to a preparation method of a compound enzyme cured sludge and fly ash mixed material. The preparation method provided by the invention specifically comprises the following steps: sludge pretreatment: dewatering the sludge, and grinding and crushing the sludge; fly ash pretreatment, wherein fly ash is screened to the required particle size; complex enzyme blending: blending the formula according to the required mass ratio to obtain a complex enzyme; preparing a mixed material, namely mixing the pretreated sludge with fly ash, adding a compound enzyme, and uniformly stirring to obtain the mixed material; the preparation method of the compound enzyme solidified sludge and fly ash mixed material has the advantages of being environmentally friendly, economical, excellent in performance, convenient to construct, capable of saving resources, wide in application and the like. A new thought and solution is provided for solving the problem of sludge and fly ash treatment and meeting the requirement of roadbed engineering for high-performance materials.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering material preparation, in particular to a method for preparing a composite enzyme solidified sludge fly ash mixed material. Background Art

[0002] With the acceleration of urbanization, the amount of sludge produced by sewage treatment plants and fly ash produced by coal-fired plants has increased dramatically, bringing great pressure to the environment. Sludge contains high organic components and moisture, while fly ash is rich in inorganic substances. Traditional treatment methods not only occupy a large amount of land resources, but may also cause secondary pollution to the environment. In recent years, research on mixing sludge and fly ash for resource utilization has gradually increased, but the stability and strength of the mixed materials are often difficult to meet the requirements of roadbed engineering.

[0003] In current engineering construction, especially in road construction, the selection and application of roadbed materials are directly related to the stability and service life of the road. Although traditional roadbed materials, such as sand, gravel, soil, etc., are widely used, in the context of increasingly scarce resources and increasing environmental pressure, finding new and sustainable roadbed materials has become a research hotspot in the industry. As two common industrial wastes, the rational use of sludge and fly ash can not only help solve environmental pollution problems, but also achieve effective resource transformation.

[0004] Sludge is a solid waste generated during sewage treatment. It is rich in organic and inorganic substances. However, due to its high water content and unstable organic content, it is difficult to use it directly. Fly ash is fine particulate matter generated in industrial processes such as coal-fired plants. Its main components are inorganic substances such as silicates and aluminates. Mixing sludge and fly ash can complement each other's advantages, reduce environmental pollution, and reduce the cost of roadbed materials.

[0005] However, the direct application of sludge fly ash mixed materials also faces some problems. First, the high organic matter content in the sludge may cause the material to degrade during long-term use, affecting the stability of the roadbed. Second, the fly ash particles are fine and easy to fly, posing a potential threat to the environment and human health. In addition, the key indicators of the sludge fly ash mixed materials, such as mechanical properties and water stability, must also meet the requirements of roadbed engineering.

[0006] In order to solve the above problems, researchers have conducted a lot of exploration and practice. In recent years, bio-enzyme technology has received widespread attention in the field of waste treatment due to its high efficiency and environmental protection. As a biological catalyst, bio-enzyme can accelerate the rate of chemical reactions while producing no or very few by-products. Therefore, the use of composite enzymes to solidify sludge fly ash mixed materials has become a new research direction. Through the solidification effect of biological composite enzymes, the organic matter in the sludge and the inorganic matter in the fly ash can be chemically reacted to form a stable chemical bonding structure, thereby improving the mechanical properties and durability of the material. Summary of the invention

[0007] The object of the present invention is to provide a method for preparing a composite enzyme solidified sludge fly ash mixed material to improve the strength and stability of the mixed material so that it can meet the application requirements of roadbed engineering.

[0008] To achieve the above object, the present invention provides the following technical solutions.

[0009] A method for preparing a composite enzyme solidified sludge fly ash mixed material, specifically comprising the following steps: Sludge pretreatment: After dehydration, the sludge is crushed and treated; Fly ash pretreatment: Screening the fly ash to the desired particle size; Compound enzyme preparation: prepare the formula according to the required mass ratio to obtain compound enzyme; Mixing material preparation: Mix the pretreated sludge with fly ash, add compound enzyme, stir evenly to obtain a mixture; Curing reaction: The mixed material is subjected to a curing reaction to finally obtain a mixed material.

[0010] Preferably, the specific steps of sludge pretreatment are as follows: Dehydrate the sludge to control the moisture content of the sludge below 10%; Use a crusher to crush the dehydrated sludge, set the crushing time to 15 minutes, and ensure that the particle size of the sludge particles is less than 5mm; The crushed sludge particles are screened to remove the sludge particles whose particle size does not meet the requirements; The sieved sludge particles were homogenized by a mixer for 30 minutes to obtain sludge pretreated particles.

[0011] Preferably, the specific steps of fly ash pretreatment are as follows: Using a sieve to screen the fly ash, removing large impurities and unburned carbon particles in the fly ash, and obtaining a fly ash screening material; Among them, the mesh size is 100 μm; The unburned carbon content is less than 0.5%.

[0012] Preferably, the specific steps of compound enzyme preparation are as follows: Using cellulase, hemicellulase and protease in a mass ratio of 3:2:1 as composite enzyme raw materials, stirring and mixing, and obtaining composite enzyme; After stirring and mixing, conduct random inspection to ensure that the activity of the complex enzyme is greater than 90%.

[0013] Preferably, the specific steps of preparing the mixture are as follows: Take the sludge pretreatment particles and fly ash screenings in a mass ratio of 9:1 to 1:1, put them into the mixer for mixing, and the mixing time is 45 minutes; 0.005% of the mass of the sludge was added into a mixer for stirring for 20 minutes to obtain a mixture; Among them, it is necessary to ensure that the test results of the uniformity of the distribution of the complex enzyme are greater than 95%.

[0014] Preferably, the specific steps of the curing reaction are as follows: The mixed material is transferred to a constant temperature and humidity chamber for curing reaction, the curing temperature is set to 20-50°C, the curing humidity is set to 50-60%, and the curing reaction time is set to 36h, and finally a mixed material is obtained.

[0015] Preferably, the dehydration treatment is performed by thermal drying using a hot air dryer; The drying temperature of the hot air dryer is 105-120℃, and the drying time is 24-36h.

[0016] Preferably, the complex enzyme raw material is prepared by a mixer, and the stirring time is 10 minutes.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0018] Environmentally friendly and economical: Using compound enzyme as curing agent avoids the use of chemical agents in traditional chemical curing methods, reduces costs, and the compound enzyme itself is degradable and will not cause secondary pollution to the environment.

[0019] Excellent performance: Through the catalytic action of the complex enzyme, the organic matter in the sludge and fly ash is decomposed, and the inorganic matter is transformed to form a stable solid structure. At the same time, the addition of the complex enzyme can also improve the impermeability, durability and other properties of the mixed material, making it more suitable for roadbed engineering.

[0020] Convenient construction: The preparation operation method is simple and easy to realize industrial production. At the same time, the solidified material has good construction performance and is easy to transport, lay and compact.

[0021] Resource conservation: Recycling sludge and fly ash into resources not only solves the problem of their treatment, but also saves land and raw material resources.

[0022] Wide application: The sludge fly ash mixed material of the present invention can be used not only in roadbed engineering, but also in other civil engineering fields, such as foundation treatment, embankment engineering, water conservancy engineering, etc. It has a wide range of application fields and good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention provides a schematic flow chart of the steps of the preparation method. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection" and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "connection" can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed" means that they are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0026] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0027] In the embodiments of the present invention, "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] References to "one embodiment" or "some embodiments" etc. described in this specification mean that one or more embodiments of the present invention include a particular feature, structure or characteristic described in conjunction with the embodiment. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized. .

[0029] See also Figure 1 The present invention provides a method for preparing a composite enzyme solidified sludge fly ash mixed material, which specifically comprises the following steps: Sludge pretreatment: After dehydration, the sludge is crushed and treated; Fly ash pretreatment: Screening the fly ash to the desired particle size; Compound enzyme preparation: prepare the formula according to the required mass ratio to obtain compound enzyme; Mixing material preparation: Mix the pretreated sludge with fly ash, add compound enzyme, stir evenly to obtain a mixture; Curing reaction: The mixed material is subjected to a curing reaction to finally obtain a mixed material.

[0030] Specifically, the specific steps of sludge pretreatment are as follows: Use hot air dryer to dehydrate the sludge, the drying temperature is 105-120℃, the drying time is 24-36h, and the moisture content of the sludge is controlled below 10%; Use a crusher to crush the dehydrated sludge, set the crushing time to 15 minutes, and ensure that the particle size of the sludge particles is less than 5mm; The crushed sludge particles are screened to remove the sludge particles whose particle size does not meet the requirements; The sieved sludge particles were homogenized by a mixer for 30 minutes to obtain sludge pretreated particles.

[0031] Specifically, the specific steps of fly ash pretreatment are as follows: Using a sieve to screen the fly ash, removing large impurities and unburned carbon particles in the fly ash, and obtaining a fly ash screening material; Among them, the mesh size is 100 μm; The unburned carbon content is less than 0.5%.

[0032] Specifically, the specific steps of compound enzyme preparation are as follows: Cellulase, hemicellulase and protease in a mass ratio of 3:2:1 were added into a blender as composite enzyme raw materials, and stirred for 10 minutes to obtain composite enzyme; After stirring and mixing, conduct random inspection to ensure that the activity of the complex enzyme is greater than 90%.

[0033] Specifically, the steps for preparing the mixture are as follows: Take the sludge pretreatment particles and fly ash screenings in a mass ratio of 9:1 to 1:1, put them into the mixer for mixing, and the mixing time is 45 minutes; 0.005% of the mass of the sludge was added into a mixer for stirring for 20 minutes to obtain a mixture; Among them, it is necessary to ensure that the test results of the uniformity of the distribution of the complex enzyme are greater than 95%.

[0034] Specifically, the specific steps of the curing reaction are as follows: The mixed material is transferred to a constant temperature and humidity chamber for curing reaction, the curing temperature is set to 20-50°C, the curing humidity is set to 50-60%, and the curing reaction time is set to 36h, and finally a mixed material is obtained. Embodiment 1

[0035] The sludge was dehydrated for 24 hours at a drying temperature of 110°C using a hot air dryer. The moisture content of the sludge was measured to be 9.5%. The dehydrated sludge was crushed for 15 minutes using a pulverizer to ensure that the particle size of the sludge particles was less than 5 mm. The crushed sludge particles were sieved to remove sludge particles with particle sizes that did not meet the requirements. The sieved sludge particles were homogenized for 30 minutes using a mixer to obtain sludge pretreatment particles.

[0036] The fly ash is screened using a sieve with an aperture of 100 μm to remove large impurities and unburned carbon particles in the fly ash to obtain a fly ash screening material, and the unburned carbon particle content of the fly ash screening material is controlled to be less than 0.5%.

[0037] Cellulase, hemicellulase and protease in a mass ratio of 3:2:1 were put into a blender as composite enzyme raw materials and stirred for 10 minutes to obtain a composite enzyme. After stirring and mixing, random inspection was carried out and the composite enzyme activity was 92%.

[0038] Sludge pretreatment particles and fly ash screenings in a mass ratio of 2:1 were put into a mixer for mixing for 45 minutes, and 0.005% of the sludge mass of the composite enzyme was put into the mixer for stirring for 20 minutes to obtain a mixture. The test result of the uniformity of the composite enzyme distribution was 96%.

[0039] The mixture was transferred to a constant temperature and humidity chamber for curing reaction at 30°C and 50% humidity for 36 hours to finally obtain mixed material A. Embodiment 2

[0040] The sludge was dehydrated for 30 hours at a drying temperature of 115°C using a hot air dryer, and the sludge moisture content was measured to be 9.2%. The dehydrated sludge was crushed for 15 minutes using a pulverizer to ensure that the particle size of the sludge particles was less than 5 mm. The crushed sludge particles were sieved to remove sludge particles with particle size that did not meet the requirements. The sieved sludge particles were homogenized for 30 minutes using a mixer to obtain sludge pretreatment particles.

[0041] The fly ash is screened using a sieve with an aperture of 100 μm to remove large impurities and unburned carbon particles in the fly ash to obtain a fly ash screening material, and the unburned carbon particle content of the fly ash screening material is controlled to be less than 0.5%.

[0042] Cellulase, hemicellulase and protease in a mass ratio of 3:2:1 were put into a blender as composite enzyme raw materials and stirred for 10 minutes to obtain a composite enzyme. After stirring and mixing, random inspection was carried out and the activity of the composite enzyme was 91%.

[0043] Sludge pretreatment particles and fly ash screenings in a mass ratio of 1:1 were put into a mixer for mixing for 45 minutes, and 0.005% of the sludge mass of the composite enzyme was put into the mixer for stirring for 20 minutes to obtain a mixture. The composite enzyme distribution uniformity test result was 97%.

[0044] The mixture was transferred to a constant temperature and humidity chamber at 30°C and 60% humidity for curing reaction for 36 hours to finally obtain mixed material B. Embodiment 3

[0045] The sludge was dehydrated for 33 hours at a drying temperature of 115°C using a hot air dryer, and the sludge moisture content was measured to be 8.9%. The dehydrated sludge was crushed for 15 minutes using a grinder to ensure that the particle size of the sludge particles was less than 5 mm. The crushed sludge particles were sieved to remove sludge particles with particle sizes that did not meet the requirements. The sieved sludge particles were homogenized for 30 minutes using a mixer to obtain sludge pretreatment particles.

[0046] The fly ash is screened using a sieve with an aperture of 100 μm to remove large impurities and unburned carbon particles in the fly ash to obtain a fly ash screening material, and the unburned carbon particle content of the fly ash screening material is controlled to be less than 0.5%.

[0047] Cellulase, hemicellulase and protease in a mass ratio of 3:2:1 were put into a blender as composite enzyme raw materials and stirred for 10 minutes to obtain a composite enzyme. After stirring and mixing, random inspection was carried out and the composite enzyme activity was 92%.

[0048] Sludge pretreatment particles and fly ash screenings in a mass ratio of 3:1 were put into a mixer for mixing for 45 minutes. 0.005% of the mass of the sludge was added to the mixer for stirring for 20 minutes to obtain a mixture. The uniformity of the distribution of the composite enzyme was tested to be 96%.

[0049] The mixture was transferred to a constant temperature and humidity chamber for curing reaction at 35°C and 60% humidity for 36 hours to finally obtain mixed material C. Embodiment 4

[0050] The sludge was dehydrated for 35 hours at a drying temperature of 120°C using a hot air dryer, and the sludge moisture content was measured to be 8.4%. The dehydrated sludge was crushed for 15 minutes using a pulverizer to ensure that the particle size of the sludge particles was less than 5 mm. The crushed sludge particles were sieved to remove sludge particles with particle size that did not meet the requirements. The sieved sludge particles were homogenized for 30 minutes using a mixer to obtain sludge pretreatment particles.

[0051] The fly ash is screened using a sieve with an aperture of 100 μm to remove large impurities and unburned carbon particles in the fly ash to obtain a fly ash screening material, and the unburned carbon particle content of the fly ash screening material is controlled to be less than 0.5%.

[0052] Cellulase, hemicellulase and protease in a mass ratio of 3:2:1 were put into a blender as composite enzyme raw materials and stirred for 10 minutes to obtain a composite enzyme. After stirring and mixing, random inspection was carried out and the composite enzyme activity was 92%.

[0053] Sludge pretreatment particles and fly ash screenings in a mass ratio of 5:1 were put into a mixer for mixing for 45 minutes, and 0.005% of the sludge mass of the composite enzyme was put into the mixer for stirring for 20 minutes to obtain a mixture. The composite enzyme distribution uniformity test result was 96%.

[0054] The mixture was transferred to a constant temperature and humidity chamber at 40°C and 60% humidity for curing reaction for 36 hours to finally obtain mixed material D. Embodiment 5

[0055] The sludge was dehydrated for 36 hours at a drying temperature of 110°C using a hot air dryer, and the sludge moisture content was measured to be 8.6%. The dehydrated sludge was crushed for 15 minutes using a grinder to ensure that the particle size of the sludge particles was less than 5 mm. The crushed sludge particles were sieved to remove sludge particles with particle size that did not meet the requirements. The sieved sludge particles were homogenized for 30 minutes using a mixer to obtain sludge pretreatment particles.

[0056] The fly ash is screened using a sieve with an aperture of 100 μm to remove large impurities and unburned carbon particles in the fly ash to obtain a fly ash screening material, and the unburned carbon particle content of the fly ash screening material is controlled to be less than 0.5%.

[0057] Cellulase, hemicellulase and protease in a mass ratio of 3:2:1 were put into a blender as composite enzyme raw materials and stirred for 10 minutes to obtain a composite enzyme. After stirring and mixing, random inspection was carried out and the composite enzyme activity was 93%.

[0058] Sludge pretreatment particles and fly ash screenings in a mass ratio of 4:1 were put into a mixer for mixing for 45 minutes. 0.005% of the mass of the sludge was added to the mixer for stirring for 20 minutes to obtain a mixture. The uniformity of the distribution of the composite enzyme was tested to be 96%.

[0059] The mixture was transferred to a constant temperature and humidity chamber at 30°C and 50% humidity for curing reaction for 36 hours to finally obtain mixed material E.

[0060] After the mixed material A prepared in Example 1 was naturally cured for 5 days, a performance test was conducted, and the load-bearing ratio was measured to be 55%, the compressive strength was 8 MPa, and the water stability was good.

[0061] After the mixed material B prepared in Example 2 was naturally cured for 7 days, a performance test was performed, and the load-bearing ratio was measured to be 60%, the compressive strength was 10 MPa, and the water stability was good.

[0062] After the mixed material C prepared in Example 3 was naturally cured for 5 days, a performance test was performed, and the load-bearing ratio was measured to be 57%, the compressive strength was 9 MPa, and the water stability was good.

[0063] After the mixed material D prepared in Example 4 was naturally cured for 7 days, a performance test was performed, and the load-bearing ratio was measured to be 59%, the compressive strength was 10 MPa, and the water stability was good.

[0064] After the mixed material E prepared in Example 5 was naturally cured for 3 days, a performance test was performed, and the load-bearing ratio was measured to be 50%, the compressive strength was 7 MPa, and the water stability was good.

[0065] It can be seen from the performance test results of the mixed materials prepared in the above embodiments and each embodiment that the preparation method provided by the present invention can prepare sludge fly ash mixed materials with excellent performance under different conditions. At the same time, by adjusting parameters such as the mixing ratio of sludge and fly ash, the addition amount of complex enzyme and the curing reaction conditions, the performance and application effect of the material can be further optimized.

[0066] In summary, the present invention proposes a method for preparing a composite enzyme solidified sludge fly ash mixed material, which has the advantages of environmental protection, economy, excellent performance, convenient construction and resource conservation, and provides a new idea and solution for solving the treatment problems of sludge and fly ash and the demand for high-performance materials in roadbed engineering. Specifically, it has the following advantages: Environmentally friendly and economical: Using compound enzyme as curing agent avoids the use of chemical agents in traditional chemical curing methods, reduces costs, and the compound enzyme itself is degradable and will not cause secondary pollution to the environment; Excellent performance: Through the catalytic action of the complex enzyme, the organic matter in the sludge and fly ash is decomposed, and the inorganic matter is transformed to form a stable solid structure. At the same time, the addition of the complex enzyme can also improve the impermeability and durability of the mixed material, making it more suitable for roadbed engineering; Convenient construction: The preparation and operation method is simple and easy to realize industrial production. At the same time, the cured material has good construction performance and is easy to transport, lay and compact; Resource conservation: Recycling sludge and fly ash into resources not only solves the problem of their treatment, but also saves land resources and raw material resources; Wide application: The sludge fly ash mixed material of the present invention can be used not only in roadbed engineering, but also in other civil engineering fields, such as foundation treatment, embankment engineering, water conservancy engineering, etc. It has a wide range of application fields and good application prospects.

[0067] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A method for preparing a composite enzyme solidified sludge fly ash mixed material, characterized in that: The specific steps include: Sludge pretreatment: After dehydration, the sludge is crushed and treated; Fly ash pretreatment: Screening the fly ash to the desired particle size; Compound enzyme preparation: prepare the formula according to the required mass ratio to obtain compound enzyme; Mixing material preparation: mixing the pretreated sludge with fly ash, adding the complex enzyme, and stirring evenly to obtain a mixture; Curing reaction: The mixed material is subjected to a curing reaction to finally obtain a mixed material.

2. The method for preparing a composite enzyme solidified sludge fly ash mixed material according to claim 1, characterized in that: The specific steps of the sludge pretreatment are as follows: Dehydrate the sludge to control the moisture content of the sludge below 10%; Use a crusher to crush the dehydrated sludge, set the crushing time to 15 minutes, and ensure that the particle size of the sludge particles is less than 5mm; The crushed sludge particles are screened to remove the sludge particles whose particle size does not meet the requirements; The sieved sludge particles were homogenized by a mixer for 30 minutes to obtain sludge pretreated particles.

3. The method for preparing a composite enzyme solidified sludge fly ash mixed material according to claim 3, characterized in that: The specific steps of the fly ash pretreatment are as follows: Using a sieve to screen the fly ash, removing large impurities and unburned carbon particles in the fly ash, and obtaining a fly ash screening material; Among them, the mesh size is 100 μm; The unburned carbon content is less than 0.5%.

4. The method for preparing a composite enzyme solidified sludge fly ash mixed material according to claim 3, characterized in that: The specific steps of the compound enzyme preparation are as follows: Using cellulase, hemicellulase and protease in a mass ratio of 3:2:1 as composite enzyme raw materials, stirring and mixing, and obtaining composite enzyme; After stirring and mixing, conduct random inspection to ensure that the activity of the complex enzyme is greater than 90%.

5. The method for preparing a composite enzyme solidified sludge fly ash mixed material according to claim 4, characterized in that: The specific steps of preparing the mixture are as follows: Take the sludge pretreatment particles and fly ash screenings in a mass ratio of 9:1 to 1:1, put them into the mixer for mixing, and the mixing time is 45 minutes; 0.005% of the mass of the sludge was added into a mixer for stirring for 20 minutes to obtain a mixture; Among them, it is necessary to ensure that the test results of the uniformity of the distribution of the complex enzyme are greater than 95%.

6. The method for preparing a composite enzyme solidified sludge fly ash mixed material according to claim 5, characterized in that: The specific steps of the curing reaction are as follows: The mixed material is transferred to a constant temperature and humidity chamber for curing reaction, the curing temperature is set to 20-50° C., the curing humidity is set to 50-60%, and the curing reaction time is set to 36 hours, and finally the mixed material is obtained.

7. The method for preparing a composite enzyme solidified sludge fly ash mixed material according to claim 2, characterized in that: The dehydration treatment is to use a hot air dryer to perform thermal drying dehydration; The drying temperature of the hot air dryer is 105-120℃, and the drying time is 24-36h.

8. The method for preparing a composite enzyme solidified sludge fly ash mixed material according to claim 4, characterized in that: The compound enzyme raw material is mixed in a mixer with a mixing time of 10 minutes.

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