A micro-nano bubble aeration iron-based system for reducing greenhouse gas methane emissions

By combining the micro-nano bubble aeration device and the iron-based vertical submerged flow artificial wetland pool, the substrate type and operation mode were optimized, the problem of low oxygen utilization rate was solved, and the synergistic effect of efficient methane emission reduction and pollutant removal was achieved.

CN118993344BActive Publication Date: 2025-09-23ZHEJIANG UNIV OF TECH
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Patent Information

Application Number
CN202411412880.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-10-11
Publication Date
2025-09-23
Estimated Expiration
2044-10-11

AI Technical Summary

Technical Problem

The existing aeration and oxygenation methods have low oxygen utilization rates in artificial wetlands. Traditional oxygen molecules have a short residence time in the liquid phase and are difficult to synergize with microorganisms and fillers, resulting in limited methane emission reduction effects.

Method used

A micro-nano bubble aeration device is combined with an iron-based vertical submerged flow constructed wetland pool, and micro-nano bubbles are used to efficiently increase oxygen. The iron-ammonia oxidation process is enhanced by a combination of iron-carbon and pyrite fillers. The matrix type and ratio are optimized to form an aerobic/anaerobic alternating environment, promoting the anaerobic oxidation of iron-reduced methane (Fe-AOM) process.

Benefits of technology

Significantly improve oxygen utilization and mass transfer efficiency, reduce methane emissions by 65%, reduce operating energy consumption, enhance pollutant removal efficiency, and achieve synergistic efficiency in pollution reduction and carbon reduction.

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Abstract

The present invention discloses a micro-nano bubble aeration type iron-based system for reducing greenhouse gas methane emissions. The system comprises an iron-based vertical subsurface flow artificial wetland pool body, wherein a water distribution channel, a valve well and a micro-nano bubble aeration device are sequentially arranged at the front end of the iron-based vertical subsurface flow artificial wetland pool body, a retaining wall is arranged between the water distribution channel and the valve well, wherein a water collection channel is arranged at the rear end of the iron-based vertical subsurface flow artificial wetland pool body, the water distribution channel is connected to the valve well and the micro-nano bubble aeration device through a pipeline, the micro-nano bubble aeration device is connected to the iron-based vertical subsurface flow artificial wetland structure through a perforated pipe, the end of the perforated pipe is extended to the water distribution channel, and wetland plants are planted on the top of the iron-based vertical subsurface flow artificial wetland structure. The present invention couples the micro-nano bubble aeration device with the iron-based vertical subsurface flow artificial wetland pool body, utilizes micro-nano bubbles for efficient oxygenation to improve the anaerobic methane production of the artificial wetland pool body; at the same time, utilizes a combined filler of iron-carbon and pyrite to strengthen the iron-ammonia oxidation process in the wetland system, thereby further reducing methane emissions.
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