Modified biogas residue-based hydrothermal carbon, and preparation method and kitchen waste dry digestion method thereof

The method for preparing modified biogas residue-based hydrothermal carbon has solved the problem of H2S inhibition in dry anaerobic digestion of kitchen waste, achieving efficient H2S emission reduction and biogas production increase. The system operates stably, is suitable for high solids concentration and different temperature conditions, and the material is recyclable.

CN121493976BActive Publication Date: 2026-06-19QINGDAO UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
QINGDAO UNIV OF TECH
Filing Date
2025-12-12
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

During the dry anaerobic digestion of food waste, H2S is difficult to remove effectively, resulting in microbial inhibition and low mass transfer efficiency. Existing technologies cannot effectively solve the problem of H2S inhibition inside the reactor, and the adsorption material is easily saturated and becomes hazardous waste, increasing the environmental burden.

Method used

Modified biogas residue-based hydrothermal char was prepared under high temperature and high pressure through phosphate pretreatment, transition metal salts, and vitamin B12-loaded biochar to form Fe-Cu composite oxides. These oxides adsorb and catalyze the oxidation of H2S, promote the metabolic activity of methanogenic archaea, inhibit substrate uptake by sulfate-reducing bacteria, and optimize the microbial community structure.

Benefits of technology

It achieves efficient H2S emission reduction, improves biogas yield and quality, ensures stable system operation, reduces operating costs, and the modified biogas residue-based hydrothermal carbon is regenerable, overcomes mass transfer limitations, and is suitable for high solids concentrations and different temperature conditions.

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Abstract

This invention discloses a modified biogas residue-based hydrothermal char, its preparation method, and a method for dry digestion of kitchen waste, belonging to the field of waste organic matter resource utilization technology. The preparation method includes: immersing biogas residue in a phosphoric acid solution to obtain pretreated biogas residue; mixing the pretreated biogas residue, transition metal salts, vitamin B12-loaded biochar, and 8-15 times the mass of water from the pretreated biogas residue, and hydrothermally reacting the mixture at 180-250℃ and 1.5-4MPa pressure for 1-4 hours to obtain a hydrothermal product; and activating the hydrothermal product under a protective atmosphere at 300-400℃ for 1-2 hours to obtain the modified biogas residue-based hydrothermal char. The surface Fe-Cu composite oxide sequentially catalytically oxidizes H2S to elemental sulfur and sulfate ions. The vitamin B12-loaded biochar promotes the directional proliferation of methanogens (MA), while sulfate ions competitively inhibit substrate uptake by serotonin (SRB), increasing the MA / SRB ratio and effectively improving methanogenesis efficiency.
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