A method for enhancing the humification and heavy metal passivation of cow manure compost using rapeseed cake.

By mixing cow dung and rapeseed cake in a certain proportion for aerobic composting, and utilizing the easily degradable organic matter and specific fungal communities in the rapeseed cake, the problems of low humification efficiency and poor heavy metal passivation effect of cow dung composting are solved, achieving efficient and low-cost improvement of compost products and stabilization of heavy metals.

CN122079668APending Publication Date: 2026-05-26KUNMING UNIV OF SCI & TECH
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Filing Date
2026-01-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Current technologies for composting cow manure have low humification efficiency and limited heavy metal passivation effects, and lack economically feasible large-scale resource utilization pathways. The application of rapeseed cake as a conditioner has not yet systematically improved the microbial community structure to promote humification and heavy metal passivation.

Method used

Cow manure and rapeseed cake are mixed in a specific ratio, and the moisture content is adjusted for aerobic composting. The easily degradable organic matter and nitrogen source in the rapeseed cake are used to initiate a high-temperature process. By enriching specific fungal communities such as Dipodascaceae_gen_Incertae_sedis, humus production is promoted and heavy metals are passivated, avoiding the need to add expensive enzymes.

Benefits of technology

It significantly extends the high-temperature period of composting, increases the content and degree of humic substances, improves the passivation rate of heavy metals, reduces environmental risks, realizes high-value utilization of waste, and is simple to operate and environmentally friendly.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122079668A_ABST
    Figure CN122079668A_ABST
Patent Text Reader

Abstract

This invention discloses a method for enhancing the composting and humification of cow manure and the passivation of heavy metals using rapeseed cake, belonging to the field of organic solid waste resource utilization technology. The method of this invention mixes cow dung and rapeseed cake at a wet weight ratio of (3.5-4.5):1, adjusts the moisture content to 65%-75%, and composts for 25-35 days. This method significantly extends the high-temperature composting period (>50℃), increases the humic acid carbon content of the resulting compost by 40% or more, significantly improves the humification index and degree of polymerization, and achieves a seed germination index of over 94%. The passivation rates for Cu and Zn are 7.69% and 38.49%, respectively, higher than those of rice straw composting methods. Throughout the later stages of composting, the relative abundance of Ascomycota fungi remains above 96%, synergistically promoting the large-scale generation of humic acid and other humic substances, converting available heavy metals copper and zinc into stable forms, with a passivation rate significantly higher than traditional methods. This invention achieves efficient cow dung composting and resource utilization of rapeseed cake waste, with advantages of low cost, high efficiency, and environmental friendliness.
Need to check novelty before this filing date? Find Prior Art