A method for preparing landscaping soil from urban sludge

A technology for urban sludge and landscaping, applied in botany equipment and methods, horticulture, applications, etc., can solve the problems of affecting soil ecological balance, changing soil physical and chemical properties, and high efficiency of physical method restoration, so as to shorten the composting cycle and reduce The effect of chemical fertilizer usage and reduction of heavy metal content

Active Publication Date: 2021-02-26
宁波高新区纯丽节能技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method has high repair efficiency and high cost; although the chemical method is effective, it is expensive and may cause secondary pollution. Although the biological method is safe and low in cost, it takes a long time
At the same time, the sludge is accompanied by the generation of odor during the composting process, which will have an impact on the surrounding environment
As for the solution to the odor in the soil, it is more cumbersome to use special deodorization equipment for deodorization, which increases the process cost. If chemical reagents are added to the sludge for deodorization, the physical and chemical properties of the soil itself may be changed, affecting soil ecological balance

Method used

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  • A method for preparing landscaping soil from urban sludge
  • A method for preparing landscaping soil from urban sludge
  • A method for preparing landscaping soil from urban sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of landscaping soil 1: (1) Adding 8% by weight of chaff, 0.3% of Bacillus licheniformis and 10% of fungal chaff to the sludge treated in the sewage plant and mixing evenly to obtain a sludge mixture; (2) Ventilate and ferment the sludge mixture obtained in step (1) for 5-7 days in an environment of 45°C-60°C; (3) Stir the product in step (2), every 2 days Turn over once, control the moisture content at 50%-60%, and get the semi-finished product after 5-7 days; (4) do not add other substances to the semi-finished product obtained in step (3), continue to mix, turn over once every 2 days, control the moisture content Between 25%-35%, after 5-7 days, it is used as a blank control group, that is, landscaping soil 1 (as a blank control).

Embodiment 2

[0046]Preparation of landscaping soil 2: (1) Adding 8% by weight of chaff, 0.3% of Bacillus licheniformis and 10% of fungal chaff to the sludge treated in the sewage plant and mixing evenly to obtain a sludge mixture; (2) Ventilate and ferment the sludge mixture obtained in step (1) for 5-7 days in an environment of 45°C-60°C; (3) Stir the product in step (2), every 2 days Turn it over once, control the moisture content at 50%-60%, and obtain a semi-finished product after 5-7 days; (4) add 1.5% quartz sand, 1.5% clay, 1% Coal gangue and 1.5% oyster shell powder mineral material and adding 1.5% starch, 3% fungus chaff, 5% biochar and 0.1% composite strains of Bacillus licheniformis and Bacillus subtilis, while adding 0.03% The soil improver citric acid is stirred evenly, then ventilated and fermented in an environment of 45°C-60°C for 5-7 days, and the moisture content of the soil is controlled between 25%-35%, so as to obtain landscaping soil 2.

Embodiment 3

[0048] Preparation of landscaping soil 3: (1) Adding 8% by weight of chaff, 0.3% of Bacillus licheniformis and 10% of fungal chaff to the sludge treated in the sewage plant and mixing evenly to obtain a sludge mixture; (2) Ventilate and ferment the sludge mixture obtained in step (1) for about 5-7 days in an environment of 45-60° C.; (3) Mix the product in step (2) every 2 days Turn it over once, control the moisture content between 50%-60%, and get the semi-finished product after 5-7 days; (4) add 3% quartz sand, 3% clay, and 2% coal gangue to the semi-finished product obtained in step (3) And 3% oyster shell powder mineral material and adding 0.08% starch, 7% fungus chaff, 8% biochar and 0.3% compound strains of Bacillus licheniformis and Bacillus subtilis, and adding 0.08% soil The improvement agent citric acid is stirred evenly, and then ventilated and fermented in an environment of 45°C-60°C for 5-7 days, and the moisture content of the soil is controlled between 25%-35%,...

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Abstract

The invention discloses a method for preparing landscaping soil by using urban sludge. The method comprises the following steps: firstly adding chaff chaff, bacterial strains and chaff chaff to urban sludge and mixing uniformly to obtain a sludge mixture material; The sludge mixed material is ventilated and fermented in an environment of 45-60°C for 5-7 days to obtain a fermentation product; the fermentation product is mixed to control the moisture content at 50-60%, and a semi-finished product is obtained after 5-7 days; Add 5.5-11% of mineral materials, 1.5-3% of starch, 0.1-0.3% of composite bacteria, 3-7% of fungus chaff, 5-8% of biochar and soil improver, and stir evenly Afterwards, ferment for 5-7 days in an environment of 45-60°C, and control the moisture content of the soil at 25-35%, so as to obtain landscaping soil. The landscaping soil prepared by the invention meets the nutritional requirements of garden plants and reduces the heavy metal content in the landscaping soil.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for preparing landscaping soil from urban sludge. Background technique [0002] The existing technology of making landscaping soil from urban sludge tends to increase the nutrients in the sludge. Usually, greening plant waste, bacterial residue, agricultural solid waste and animal manure are added to the sludge to increase the nutrient content in the sludge. Nutrients to meet the growth needs of plants. However, there is currently a lack of landscaping soil preparation technology that can effectively reduce heavy metals in the soil while using urban sludge as landscaping soil to meet the needs of plant growth. [0003] For soil heavy metal remediation, it is usually divided into physical, chemical and biological methods. The physical method has high repair efficiency and high cost; although the chemical method is effective, it is expensive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01G24/00A01G24/10A01G24/15A01G24/20A01G24/22A01G24/30
CPCA01G24/00A01G24/10A01G24/15A01G24/20A01G24/22A01G24/30
Inventor 包晓东王家德陆敏英李丽李非里
Owner 宁波高新区纯丽节能技术有限公司
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