Gardening growth nutrient soil produced from domestic sludge and production method thereof

Abstract

The invention discloses horticultural growth nutrient soil produced from domestic sludge and a production method thereof, relates to the technical field of nutrient soil, and aims to solve the problem that harmful substances such as metals, pathogens and organic pollutants in the domestic sludge possibly have adverse effects on plants. The nutrient soil comprises the following components in percentage by mass: 35%-45% of treated domestic sludge, 15%-25% of perlite, 10%-15% of vermiculite, 8%-12% of humus, 2%-4% of limestone powder, 0.5%-1% of a microelement additive, 0.1%-0.3% of a microbial agent, 5%-15% of coco coir and 1%-4% of natural humic acid. 1%-3% of plant ash and 2%-5% of sawdust. The method has the advantage that the waste which is originally difficult to treat is successfully converted into the horticultural growth soil rich in nutrition through dehydration, heavy metal removal, high-temperature steam sterilization and aerobic fermentation.

Description

Technical Field

[0001] The present invention relates to the technical field of nutrient soil, and more specifically to a horticultural nutrient soil produced by utilizing domestic sewage sludge and a production method thereof. Background Art

[0002] With the acceleration of urbanization, the amount of domestic sewage generated continues to increase, and the resulting domestic sludge also shows a rapid growth trend. Domestic sludge not only contains rich organic matter and nutrients (such as nitrogen, phosphorus, and potassium), but also contains harmful components such as heavy metals, pathogens, and organic pollutants. The presence of these harmful components makes it a huge challenge to directly apply domestic sludge to fields such as horticulture and agriculture.

[0003] In the prior art, a small amount of domestic sludge is mixed with good soil and then used for horticultural planting. Although this method is simple and easy to implement, harmful substances such as metals, pathogens, organic pollutants, etc. in the sludge may still have adverse effects on plants.

[0004] In view of this, we propose a horticultural growth nutrient soil produced by utilizing domestic sewage sludge and a production method thereof. Summary of the invention

[0005] The purpose of the present invention is to provide a horticultural growth nutrient soil produced by using domestic sewage sludge and a production method thereof, aiming to solve the problem that harmful substances such as metals, pathogens, organic pollutants in domestic sewage sludge may still cause adverse effects on plants.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a horticultural growth nutrient soil produced by using domestic sewage sludge, wherein the nutrient soil comprises the following components in proportion by mass percentage:

[0007] 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 8%-12% humus, 2%-4% limestone powder, 0.5%-1% trace element additives, 0.1%-0.3% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% wood ash, 2%-5% sawdust;

[0008] The treated domestic sludge is obtained by the following steps:

[0009] The domestic sludge is dehydrated, and its water content shall not exceed 70%. 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized with high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, it is aerobic fermented in a bioreactor for 4-6 days and inoculated with microbial agents.

[0010] Preferably, the microbial agent includes Bacillus subtilis, Bacillus megaterium and Pseudomonas, and the inoculation amount is 0.3% of the sludge mass, so as to stabilize the sludge and degrade organic matter.

[0011] Preferably, the trace element additive comprises iron, zinc, manganese and copper, and the content of each element is not less than 0.1%.

[0012] Preferably, the particle size of the perlite is 2-4 mm, and the particle size of the vermiculite is 1-3 mm.

[0013] Preferably, the humus is natural humus soil, and its organic matter content is not less than 45%.

[0014] A method for producing horticultural nutrient soil using domestic sewage sludge, the method comprising the following steps:

[0015] S1: 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 8%-12% humus, 2%-4% limestone powder, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% plant ash, and 2%-5% sawdust are mixed evenly;

[0016] S2: sending the mixed materials into a granulator for granulation to obtain nutrient soil particles with a particle size of 8-12 mm;

[0017] S3: Send the nutrient soil particles into a dryer and dry them at 60-70°C until the moisture content does not exceed 10%;

[0018] S4: Cooling the dried nutrient soil particles, and screening out unqualified particles to obtain qualified nutrient soil particles;

[0019] S5: Add 0.5%-1% of trace element additives to the qualified nutrient soil particles to finally obtain the finished nutrient soil product.

[0020] Preferably, in step S1, the mixed materials are further crushed to ensure uniform particle size.

[0021] Preferably, in step S4, the unqualified particles screened out are returned to step S2 for re-granulation.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention successfully transforms the originally difficult-to-treat waste into nutrient-rich horticultural soil by subjecting domestic sludge to a series of treatments, such as dehydration, removal of heavy metals, high-temperature steam sterilization and aerobic fermentation. This not only solves the problem of domestic sludge treatment, but also reduces its pollution to the environment and realizes the effective recycling of resources.

[0024] 2. The present invention comprises a variety of ingredients beneficial to the growth of horticultural plants, such as perlite, vermiculite, humus, coconut bran, natural humic acid, plant ash and sawdust, which not only provide rich organic matter and trace elements, but also improve the air permeability and water retention of the soil, provide a comprehensive and balanced nutritional environment for horticultural plants, and promote their healthy growth.

[0025] 3. The present invention adopts granulation, drying, cooling and screening processes to ensure that the nutrient soil particles have uniform particle size, low moisture content and reliable quality. At the same time, by adding microbial agents and trace element additives, the fertilizer efficiency and stability of the nutrient soil are further improved. In addition, the return processing of unqualified particles also ensures the qualified rate of the product, so that the final nutrient soil product can meet the growth needs of horticultural plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the production method of horticultural nutrient soil produced by using domestic sewage sludge in the present invention. DETAILED DESCRIPTION

[0027] Embodiment 1

[0028] like Figure 1 As shown, a horticultural nutrient soil produced by using domestic sewage sludge, the nutrient soil comprises the following components in proportion by mass percentage:

[0029] 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 8%-12% humus, 2%-4% limestone powder, 0.5%-1% trace element additives, 0.1%-0.3% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% wood ash, 2%-5% sawdust;

[0030] The treated domestic sludge is obtained by the following steps:

[0031] The domestic sludge is dehydrated, and its water content shall not exceed 70%. A 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized by high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, a bioreactor is used for aerobic fermentation for 4-6 days and inoculated with microbial agents.

[0032] The core raw material of this nutrient soil is 35%-45% domestic sludge. These sludges have undergone multiple treatments such as dehydration, heavy metal removal, high-temperature steam sterilization and aerobic fermentation to ensure their safety and stability. At the same time, 15%-25% perlite (particle size controlled at 2-4mm), 10%-15% vermiculite (particle size 1-3mm), 8%-12% high organic humus (organic matter content not less than 45%), as well as limestone powder, coconut bran, natural humic acid, wood ash and sawdust are added to the nutrient soil. These ingredients together provide a comprehensive and balanced nutritional environment for horticultural plants.

[0033] During the production process, the nutrient soil uses advanced mixing, crushing, granulation, drying, cooling and screening technologies to ensure the healthy growth of horticultural nutrient soil particles, providing a strong and uniform guarantee of particle size, low moisture content and reliable quality. In particular, by adding microbial agents and trace element additives, the fertilizer efficiency and stability of the nutrient soil are further improved. The nutrient soil not only solves the problem of domestic sludge treatment, realizes the effective transformation of resources and friendly protection of the environment, but also provides a high-quality and reliable growth medium for the horticultural industry.

[0034] Embodiment 2

[0035] This embodiment is basically the same as the first embodiment, except that the proportion of perlite is different:

[0036] A horticultural nutrient soil produced by using domestic sewage sludge, the nutrient soil comprising the following components in proportion by mass percentage:

[0037] 35%-45% treated domestic sludge, 10%-18% perlite, 10%-15% vermiculite, 8%-12% humus, 2%-4% limestone powder, 0.5%-1% trace element additives, 0.1%-0.3% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% wood ash, 2%-5% sawdust;

[0038] The treated domestic sludge is obtained by the following steps:

[0039] The domestic sludge is dehydrated, and its water content shall not exceed 70%. 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized with high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, it is aerobic fermented in a bioreactor for 4-6 days and inoculated with microbial agents.

[0040] Embodiment 3

[0041] The embodiment is basically the same as the embodiment 1, except that the ratio of vermiculite is different:

[0042] A horticultural nutrient soil produced by using domestic sewage sludge, the nutrient soil comprising the following components in proportion by mass percentage:

[0043] 35%-45% treated domestic sludge, 15%-25% perlite, 15%-20% vermiculite, 8%-12% humus, 2%-4% limestone powder, 0.5%-1% trace element additives, 0.1%-0.3% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% wood ash, 2%-5% sawdust;

[0044] The treated domestic sludge is obtained by the following steps:

[0045] The domestic sludge is dehydrated, and its water content shall not exceed 70%. 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized with high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, it is aerobic fermented in a bioreactor for 4-6 days and inoculated with microbial agents.

[0046] Embodiment 4

[0047] The embodiment is basically the same as the first embodiment, except that the ratio of humus is different:

[0048] A horticultural nutrient soil produced by using domestic sewage sludge, the nutrient soil comprising the following components in proportion by mass percentage:

[0049] 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 12%-14% humus, 2%-4% limestone powder, 0.5%-1% trace element additives, 0.1%-0.3% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% plant ash, 2%-5% sawdust;

[0050] The treated domestic sludge is obtained by the following steps:

[0051] The domestic sludge is dehydrated, and its water content shall not exceed 70%. 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized with high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, it is aerobic fermented in a bioreactor for 4-6 days and inoculated with microbial agents.

[0052] Embodiment 5

[0053] The embodiment is basically the same as the embodiment 1, except that the proportion of limestone powder is different:

[0054] A horticultural nutrient soil produced by using domestic sewage sludge, the nutrient soil comprising the following components in proportion by mass percentage:

[0055] 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 8%-12% humus, 4%-6% limestone powder, 0.5%-1% trace element additives, 0.1%-0.3% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% plant ash, 2%-5% sawdust;

[0056] The treated domestic sludge is obtained by the following steps:

[0057] The domestic sludge is dehydrated, and its water content shall not exceed 70%. 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized with high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, it is aerobic fermented in a bioreactor for 4-6 days and inoculated with microbial agents.

[0058] Embodiment 6

[0059] The embodiment is basically the same as the embodiment 1, except that the ratio of the microbial agent is different:

[0060] A horticultural nutrient soil produced by using domestic sewage sludge, the nutrient soil comprising the following components in proportion by mass percentage:

[0061] 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 8%-12% humus, 2%-4% limestone powder, 0.5%-1% trace element additives, 0.3%-0.5% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% wood ash, 2%-5% sawdust;

[0062] The treated domestic sludge is obtained by the following steps:

[0063] The domestic sludge is dehydrated, and its water content shall not exceed 70%. 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized with high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, it is aerobic fermented in a bioreactor for 4-6 days and inoculated with microbial agents.

[0064] Embodiment 7

[0065] The embodiment is basically the same as the embodiment 1, except that the ratio of the trace element additives is different:

[0066] A horticultural nutrient soil produced by using domestic sewage sludge, the nutrient soil comprising the following components in proportion by mass percentage:

[0067] 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 8%-12% humus, 2%-4% limestone powder, 1.2%-1.5% trace element additives, 0.1%-0.3% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% wood ash, 2%-5% sawdust;

[0068] The treated domestic sludge is obtained by the following steps:

[0069] The domestic sludge is dehydrated, and its water content shall not exceed 70%. 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized with high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, it is aerobic fermented in a bioreactor for 4-6 days and inoculated with microbial agents.

[0070] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A horticultural nutrient soil produced using domestic sewage sludge, characterized in that: The nutrient soil comprises the following components in proportion by mass percentage: 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 8%-12% humus, 2%-4% limestone powder, 0.5%-1% trace element additives, 0.1%-0.3% microbial agent, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% wood ash, 2%-5% sawdust; The treated domestic sludge is obtained by the following steps: The domestic sludge is dehydrated, and its water content shall not exceed 70%. 0.05 mol / L sodium sulfide solution is added to the domestic sludge at 3% of the mass of the dehydrated domestic sludge to remove heavy metals. The domestic sludge is then sterilized with high-temperature steam at 100°C for 2.5 hours to kill pathogens. Finally, it is aerobic fermented in a bioreactor for 4-6 days and inoculated with microbial agents.

2. The horticultural growth nutrient soil produced by using domestic sewage sludge according to claim 1, characterized in that: The microbial agent includes Bacillus subtilis, Bacillus megaterium and Pseudomonas, and the inoculation amount is 0.3% of the sludge mass, so as to stabilize the sludge and degrade organic matter.

3. The horticultural growth nutrient soil produced by using domestic sewage sludge according to claim 1, characterized in that: The trace element additives include iron, zinc, manganese and copper, and the content of each element is not less than 0.1%.

4. The horticultural growth nutrient soil produced by using domestic sewage sludge according to claim 1, characterized in that: The particle size of the perlite is 2-4 mm, and the particle size of the vermiculite is 1-3 mm.

5. The horticultural growth nutrient soil produced by using domestic sewage sludge according to claim 1, characterized in that: The humus is natural humus soil, and its organic matter content is not less than 45%.

6. A method for producing horticultural nutrient soil produced by using domestic sewage sludge, comprising the horticultural nutrient soil produced by using domestic sewage sludge as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1: 35%-45% treated domestic sludge, 15%-25% perlite, 10%-15% vermiculite, 8%-12% humus, 2%-4% limestone powder, 5%-15% coconut bran, 1%-4% natural humic acid, 1%-3% plant ash, and 2%-5% sawdust are mixed evenly; S2: sending the mixed materials into a granulator for granulation to obtain nutrient soil particles with a particle size of 8-12 mm; S3: Send the nutrient soil particles into a dryer and dry them at 60-70°C until the moisture content does not exceed 10%; S4: Cooling the dried nutrient soil particles, and screening out unqualified particles to obtain qualified nutrient soil particles; S5: Add 0.5%-1% of trace element additives to the qualified nutrient soil particles to finally obtain the finished nutrient soil product.

7. The method for producing horticultural nutrient soil using domestic sewage sludge according to claim 6, characterized in that: In step S1, the mixed materials need to be crushed to ensure uniform particle size.

8. The method for producing horticultural nutrient soil using domestic sewage sludge according to claim 6, characterized in that: In step S4, the unqualified particles screened out are returned to step S2 for re-granulation.

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