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Plant culture mediums and preparation method thereof

A technology for cultivating substrates and plants, which is applied in the intersection of plant cultivation and environmental protection, and can solve violations of sludge treatment and disposal reduction, stabilization and harmless goals, environmental quality and public health threats, and secondary environmental pollution. and other problems, to achieve the effects of excellent physical and chemical properties, high nutrient load, low bulk density and low cost

Inactive Publication Date: 2013-04-17
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high degree of activation of sludge nutrients, it is easy to lose nutrients under water-humidity conditions, and enter the surface and underground runoff, resulting in serious secondary environmental pollution, which not only poses a threat to my country's environmental quality and public health, but also violates my country's sludge Reduction, stabilization and decontamination objectives for disposal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Pre-collect 100g of sludge, dry it until the weight is no longer reduced, weigh 24g, and obtain a water content of 76%.

[0033] After drying, 24~48kg of domestic boiler slag and 10kg of clay are crushed to a particle size of less than 5 mm, mixed with 200kg of sewage treatment plant sludge (water content 76%), and dried at 180°C, then crushed and screened. Add 1kg of earthworm feces to the part with a diameter of 0.1~2.5mm to make a plant culture medium. The bulk density of the matrix is ​​0.65, and the total porosity is 74%, of which water-holding porosity accounts for 56% and aeration porosity accounts for 18%; the contents of nutrient elements nitrogen, phosphorus and potassium are 8.32, 3.88 and 1.92 g / kg, respectively. Take part of the substrate and sown the seeds of ryegrass, bluegrass and lettuce in the flowerpots, and cover the substrate with a thickness of 0.5cm, and water and cultivate at a temperature of 16-30°C. After 14 days of cultivation, the seedling ...

Embodiment 2

[0036] Pre-collect 100g of sludge, dry it until the weight is no longer reduced, weigh 24g, and obtain a water content of 76%.

[0037] Crush 30~60kg of domestic boiler slag and 10kg of clay after drying to a particle size of 5 mm or less, mix well with 250kg of sewage treatment plant sludge (moisture content 76%), dry at 180°C, crush and screen the particles Add 1kg of earthworm feces to the part with a diameter of 0.1~2.5mm to make a plant culture medium. The bulk density of the matrix is ​​0.63, and the total porosity is 79%, of which water-holding porosity accounts for 62% and aeration porosity accounts for 17%; the contents of nutrient elements nitrogen, phosphorus and potassium are 9.08, 4.21 and 2.12 g / kg, respectively. Take part of the substrate and sown the seeds of ryegrass, bluegrass and lettuce in the flowerpots, cover the substrate with a thickness of 0.5 cm, and cultivate under normal watering at a temperature of 18-32°C. After 14 days of cultivation, the seedl...

Embodiment 3

[0040] Pre-collect 100g of sludge, dry it until the weight is no longer reduced, and weigh 30g to obtain a moisture content of 70%.

[0041] Separately pulverize 30kg of domestic boiler slag after drying to a particle size of less than 5 mm, mix it with 200kg of sewage treatment plant sludge (water content 70%), and then dry it at 200°C and crush it. The selected particle size is 0.1~2.5mm Part, add 1kg of earthworm feces and mix well to make plant culture substrate. The bulk density of the matrix is ​​0.65, and the total porosity is 68%, of which water-holding porosity accounts for 52% and aerated porosity accounts for 16%; the contents of nutrient elements nitrogen, phosphorus and potassium are 8.52, 3.68 and 1.90 g / kg, respectively. Take part of the substrate and sown the seeds of ryegrass, bluegrass and lettuce in the flowerpots, and cover the substrate with a thickness of 0.5cm, and water and cultivate at a temperature of 16-30°C. After 14 days of cultivation, the seedling ...

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Abstract

The invention belongs to the crossing field of plant cultivation and environment protection, particularly to plant culture mediums and a preparation thereof. The invention aims at solving the problem of an environmental friendly processing of domestic sludges, so that the invention provides a preparation method of sludge modified plant culture mediums and plant culture mediums using the preparation method of sludge modified plant culture mediums to achieve high efficiency resource utilization of different kinds of wastes. The plant culture mediums are prepared by utilizing the domestic sludges as basic materials to mix with slags and earthworm excrement, wherein the weight ratio of every component is 0.5-5 parts of earthworm excrement, 30-75 parts of sludges and 25-50 parts of slags and the domestic sludges are calculated according to the amount of dry matter. The plant culture mediums has the advantages of stable granules and multi-pore structures (the total pore rate is between 52-85 %, steam water ratio, namely the ratio of ventilate gap and retention gap is between 0.2-0.5) and high mineral nutrition load.

Description

[0001] Technical field [0002] The invention belongs to the cross field of plant cultivation and environmental protection, and more specifically relates to a plant culture substrate and a preparation method thereof. [0003] Background technique [0004] The treatment and disposal of sludge in sewage treatment plants is a continuation of sewage treatment, and traditional sludge treatment methods are expensive. In my country's urban sewage treatment plants, the traditional sludge treatment process costs about 20% to 50% of the total operating costs of the sewage treatment plant. At present, the commonly used sludge disposal methods mainly include: landfill, incineration, agriculture and landscaping. The landfill method not only occupies a large amount of arable land, but often because there is no pre-dewatering, the sludge can easily block the leachate collection pipeline of the landfill, which affects the normal operation of the drainage system. The sludge contains a large amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G9/10
Inventor 郑建伟徐婷王旭雯韩华杨赵伯霞
Owner NANJING UNIV OF INFORMATION SCI & TECH
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