Preparation method of slow-release sludge-based nutrient soil

Through multi-stage granulation technology, combined with biological carbon and microbial agents, the organic matter and nutrient elements in advanced anaerobic digestion of sludge is slowly released, solving the problem of the rapid release of nutrients after the dehydrated sludge is mixed with the soil, and improving soil microscope Ecological and environmental security.

CN119183914APending Publication Date: 2024-12-27BEIJING DRAINAGE GRP CO LTD
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Patent Information

Application Number
CN202411575761.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-06
Publication Date
2024-12-27

AI Technical Summary

Technical Problem

Advanced anaerobic digested sludge is directly mixed with the soil after dehydration, resulting in the release of organic matter, nutrients and salt too quickly and cannot be fully utilized, and may cause problems such as eutrophication of water and soil slab formation.

Method used

Using multi-stage granulation technology, the first biological carbon, composite microbial agent and adhesive are mixed to form the first level of sustained-release nutrient soil particles, and then mixed with the dehydrated sludge and the sustained-release material to form the second and third levels The sustained-release nutrient soil particles slowly release organic matter and nutrient elements through the combination of biocarbons and adhesives, reducing the migration of toxic substances.

Benefits of technology

It achieves slow release of nutrients, improves soil microecology, reduces the risk of eutrophication of water bodies and soil plating, and improves the utilization rate and environmental safety of dehydrated sludge.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a preparation method of slow-release sludge-based nutrient soil, which comprises the following steps: mixing first biochar, a compound microbial agent and a first adhesive according to a set proportion, and carrying out first-stage granulation to form first-stage slow-release nutrient soil particles; mixing dewatered sludge and a slow-release material according to a set proportion, and mixing the mixture with the first-stage slow-release nutrient soil particles for second-stage granulation to form second-stage slow-release nutrient soil particles; mixing second biological carbon and a second adhesive according to a set proportion, and mixing with the second-stage slow-release nutrient soil particles for third-stage granulation to form third-stage slow-release nutrient soil particles; according to the preparation method, the slow-release sludge-based nutrient soil prepared by adopting multi-stage granulation can slowly release organic matters, nutritional nutrients and salt, meanwhile, the mobility of toxic and harmful substances in the dewatered sludge can be reduced, the pollution risk to soil and water is reduced, the utilization rate of the nutrients of the dewatered sludge is increased, and the nutrient utilization rate of the dewatered sludge is increased. And the risk of dewatered sludge to the environment is reduced.
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Citation Information

Patent Citations

  • Nutrition slow release fertilizer special for blueberries and preparing method thereof

    CN105198587A

  • Sludge-biological carbon organic compound fertilizer and preparation method thereof

    CN107285847A

  • Method of preparing organic nutritional soil from municipal sludge

    CN109526679A

  • Immobilized nutrient soil particle as well as preparation method and application thereof

    CN112430172A

Cited By

  • Manufacturing method for slow‑release sludge-based nutrient soil

    WO2026098072A1