Extensive type green roof growth medium based on sludge resource reuse

A growth medium, extensive technology, used in application, cultivation, agriculture, etc., can solve the problem of unknown formula, and achieve the effect of prolonging retention time, high penetration rate, and long nutrient retention time.

Inactive Publication Date: 2017-09-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are light-weight sustained-release media that can achieve these functions for s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0025] The present invention mainly relates to a new type of extensive green roof growth medium material and its specific formula based on resource reuse. bio-charcoal.

[0026] The configuration method of the medium is to mix light inorganic materials, wood chips, pastoral soil, anaerobic digested granular sludge, water supply plant sludge, rice husk charcoal according to a suitable mass ratio, natural pumice, wood chips, pastoral soil, anaerobic Oxygen digestion sludge, water supply plant sludge, rice husk charcoal, the mass percentage is 59%: 5%: 20%: 5%: 10%: 1%.

[0027] When the medium is configured and put into use, it needs to be maintained. The method is to fully moisten it with water, but the amount of watering does not exceed the field water holding capacity of the medium.

[0028] The light inorganic material has a particle size of 3-5mm. The light inorganic material should meet the requirements of low bulk density, good water holding capacity and high strength, a...

Embodiment 2

[0039] Example 2 provides a comparison of plant growth under the conditions of not containing anaerobic digested sludge (medium C) and containing anaerobic digested sludge (medium D). The composition ratio of the two media is shown in Table 2 below.

[0040] Table 2 shows the relevant data of the extensive green roof installation using the new medium under the simulated rainfall of 1200mm. The experiment lasted for half a year, and the rainfall was simulated once a week by spraying, with a rainfall depth of 50mm each time. Among them, the composition of medium C includes pumice, pastoral soil, wood chips, rice husk charcoal, and sludge from water supply plants, excluding nutrient supplement anaerobic digested sludge; the composition of medium D is made of pumice, pastoral soil, wood chips, anaerobic Digested sludge, rice husk charcoal, sludge from water supply plants. According to the experimental results, in summer, after the leaching effect of the simulated rainfall equiva...

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Abstract

The invention relates to an extensive type green roof growth medium based on sludge resource reuse. Sludge refers to the anaerobic digestion granule sludge and the sludge from a water supply plant. The medium is prepared by mixing a light inorganic material, rural soil, wood flour, rice husk charcoal and other biological carbon and the sludge in a certain weight ratio, wherein the light inorganic material, the rural soil and the wood flour form main components of the growth medium, and the main components are principal components for maintaining the growth of plants; the anaerobic digestion granule sludge contains a lot of nutritive elements and is used as a nutrient supplement to supply nutrients to the plants growing in the medium; the rice husk charcoal and the sludge from the water supply plant as water quality improving materials control the concentration of nutrient substances, such as nitrogen and phosphorus, in the effluent of a facility, the quality of the effluent is improved, and meanwhile, the retention time of the nutrients in the medium is prolonged. According to the disadvantages that a traditional roof greening growth medium is high in bulk density and rapid in nutrient loss, when the novel extensive type green roof growth medium formed by the materials is used, the medium meets the requirements for low weight, high infiltration rate and long nutrient retention time, and meanwhile, the sludge resource reuse is achieved.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to the specific formula and application effect of a novel extensive green roof growth medium. Background technique [0002] The advancement of urbanization has led to a substantial increase in the area of ​​urban impervious areas. The roof is an important part of the impermeable surface. In rainy days, a large amount of roof runoff quickly flows into the urban drainage network, threatening the safety of the urban drainage system. In order to solve this problem, it is necessary to implement low-impact development. Extensive green roof is a low-maintenance green roof after it is put into use. As an important part of low-impact development technology, this technology has good hydrological effects and can effectively reduce the water volume and peak flow of roof runoff. [0003] Traditional green roofs, also known as intensive green roofs, have the disadvantages of ...

Claims

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Application Information

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IPC IPC(8): A01G9/10
Inventor 李田沈庆然
Owner TONGJI UNIV
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