A soil LiTFSI-degrading bacterium and its application in environmental remediation.

By degrading LiTFSI with Nitroreducing Pseudomonas LiT2 and LiT3, and combining it with the enzyme expression of Pseudomonas putida KT2440, the problem of unclear degradation pathway of LiTFSI in soil was solved, achieving efficient and environmentally friendly soil remediation.

CN121674306BActive Publication Date: 2026-05-26GUANGDONG PHARMA UNIV +1
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Patent Information

Application Number
CN202610168096.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-02-05
Publication Date
2026-05-26
Estimated Expiration
2046-02-05

AI Technical Summary

Technical Problem

In existing technologies, the environmental behavior and biotransformation pathways of perfluorinated and polyfluorinated alkyl substances (PFAS) such as LiTFSI generated during lithium-ion battery recycling are unclear in soil, and their degradation conditions and accumulation of secondary pollutants are difficult to control, affecting the effectiveness of environmental remediation.

Method used

Nitroreducens Pseudomonas nitroreducens LiT2 and LiT3 were used as LiTFSI degrading bacteria. They degraded the bacteria through N/S bond cleavage enzymes, denitrases, desulfonases, and dehalogenases. The compound bacterial agent was constructed for soil remediation by combining it with key degrading enzymes expressed by Pseudomonas nitrosamine KT2440.

Benefits of technology

It achieves efficient degradation of LiTFSI and its related PFAS, significantly reduces pollution levels in soil, provides a precise and rapid environmentally friendly remediation strategy, and reduces the accumulation of secondary pollutants.

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Abstract

This invention relates to the field of microbial technology, and particularly to a soil LiTFSI-degrading bacterium and its application in environmental remediation. The LiTFSI-degrading bacterium is *Pseudomonas nitroreductoides* (Nitroreducing Pseudomonas). Pseudomonas nitroreducens LiT2 or LiT3 were deposited on December 1, 2025, at the Guangdong Provincial Microbial Culture Collection Center, located at 5th Floor, Building 59, No. 100, Xianlie Middle Road, Guangzhou, China, with accession numbers GDMCC No: 67389 and GDMCC No: 67390, respectively. This soil LiTFSI-degrading bacterium can use LiTFSI as its sole carbon source and exhibits excellent degradation efficiency for LiTFSI. This invention also provides an environmental remediation agent that can precisely and rapidly intervene in and enhance the degradation process of LiTFSI in soil, thereby significantly reducing the pollution levels of LiTFSI and its intermediate metabolites TFNH2 and TFOH.
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