A method and constructed wetland system for denitrification and microplastic removal of wastewater based on functional bacteria enrichment

By constructing a four-layer constructed wetland system and using functional bacteria enrichment technology, the problem of simultaneous removal of nitrogen and microplastics from wastewater was solved, achieving efficient and stable wastewater treatment results.

CN122144925APending Publication Date: 2026-06-05ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Filing Date
2026-01-19
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing wastewater treatment technologies are inadequate for efficiently removing nitrogen and microplastics simultaneously, and traditional methods suffer from low efficiency, high cost, and poor stability.

Method used

A four-layer constructed wetland system based on functional bacteria enrichment is adopted, including an aerobic layer, a facultative anaerobic layer, an anaerobic layer and a support layer. It utilizes a combination of fillers such as sludge biochar, gravel and pyrite, combined with strains of Bacillus mesenteriae and Bacillus niger to achieve the synergistic effect of physical interception, adsorption enrichment and biodegradation.

Benefits of technology

It achieves efficient removal of nitrogen and microplastics from wastewater, with stable effluent quality, improved denitrification efficiency, low cost, and suitability for complex wastewater treatment.

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Abstract

The application provides a method and a constructed wetland system for denitrification and microplastic removal of wastewater based on enrichment of functional bacteria, and belongs to the technical field of wastewater treatment. The constructed wetland system comprises a system main body, four layers are arranged in the system main body from top to bottom, and the four layers are an aerobic layer, a facultative anaerobic layer, an anaerobic layer and a support layer. The aerobic layer comprises sludge biochar. The facultative anaerobic layer comprises gravel. The anaerobic layer comprises sludge biochar and pyrite. The application realizes the synergistic enhancement of denitrification and microplastic removal by the combination of directional enrichment of functional bacteria, construction of a layered filler system and directional colonization of microorganisms, and fills the blank of traditional technology in the treatment of composite contaminated wastewater.
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