Integrated device for anaerobic fermentation of agricultural waste and micro-aerobic desulfurization of biogas and method of use

By integrating agricultural waste anaerobic fermentation and biogas micro-oxygen desulfurization devices, and utilizing micro-oxygen in-situ desulfurization and chemical desulfurization technologies, the high energy consumption and high cost problems caused by separate operation have been solved, achieving efficient resource utilization of agricultural waste and reducing equipment costs.

CN115058333BActive Publication Date: 2025-11-07HUAXIA BISHUI ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Application Number
CN202210847175.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-19
Publication Date
2025-11-07
Estimated Expiration
2042-07-19

AI Technical Summary

Technical Problem

In existing technologies, anaerobic fermentation of agricultural waste and biogas desulfurization are usually operated separately, resulting in high equipment investment and operation and management costs, high overall process energy consumption, and additional investment and management costs in biogas transportation and storage. At the same time, H2S gas has the problems of inhibiting the activity of methanogenic bacteria and corroding equipment.

Method used

The anaerobic fermentation of agricultural waste is integrated with biogas micro-oxygen desulfurization. By introducing trace amounts of O2 into the anaerobic system, it reacts with H2S to generate elemental sulfur. Micro-oxygen in-situ desulfurization technology is used to desulfurize the sulfur in the anaerobic reactor. Combined with the chemical desulfurization of waste iron filings, the generated sulfur and FeS precipitates are used as resources.

Benefits of technology

It achieves efficient resource utilization of agricultural waste, reduces the construction cost of desulfurization equipment, improves anaerobic fermentation efficiency, and the generated nano-sized sulfur and FeS precipitate can be reused as resources, reducing equipment footprint and operating costs.

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Abstract

The application relates to an integrated device for anaerobic fermentation of agricultural waste and micro-oxygen desulfurization of biogas and a use method, comprising an anaerobic reactor and a feeding unit, an online monitoring unit, an air inlet unit and a pH adjusting unit connected with the anaerobic reactor; the inside of the anaerobic reactor comprises, from bottom to top, an anaerobic fermentation zone, a biogas gas distribution zone and a desulfurization zone, the anaerobic fermentation zone is provided with a stirring device, the desulfurization zone is provided with desulfurization fillers, and the desulfurization fillers are loaded with sulfur-oxidizing bacteria; the air inlet unit is connected with the desulfurization zone through an air pipe, the feeding unit is connected with the lower part of the anaerobic fermentation zone, and the online monitoring unit and the pH adjusting unit are connected with the middle and upper parts of the anaerobic fermentation zone; the feeding unit comprises a first raw material tank and a second raw material tank, which are respectively used for pretreating livestock and poultry manure and planting industry organic waste; the outside top of the anaerobic reactor is provided with an exhaust pipe, the middle part is provided with a biogas slurry discharge pipe, and the bottom is provided with a material discharge pipe.
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