An additive for thermal desorption process of polycyclic aromatic hydrocarbon contaminated soil and a preparation method thereof

By using a catalyst combining manganese, rare earth metals, and transition metal composite oxides with Fe3O4, the problems of low-temperature desorption efficiency and high energy consumption in polycyclic aromatic hydrocarbon (PAH) contaminated soil were solved, achieving efficient and economical PAH removal and additive recovery, and reducing treatment costs.

CN122352279APending Publication Date: 2026-07-10JIANGSU YANGTZE RIVER DELTA ENVIRONMENTAL SCI & TECH RES INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU YANGTZE RIVER DELTA ENVIRONMENTAL SCI & TECH RES INST CO LTD
Filing Date
2025-11-28
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing ex-situ thermal desorption technologies have low desorption efficiency and high energy consumption in polycyclic aromatic hydrocarbon contaminated soils under low-temperature conditions, and the additives are difficult to separate and recover, resulting in high treatment costs.

Method used

A magnetic catalyst combining manganese, rare earth metals, and transition metal composite oxides with Fe3O4 is prepared via a hydrothermal process to form a hollow spherical structure for thermal desorption of polycyclic aromatic hydrocarbons (PAHs) contaminated soil. The catalyst utilizes its catalytic oxidation properties to oxidize PAHs at low temperatures, and the magnetic properties of Fe3O4 enable the separation and recovery of additives.

Benefits of technology

It achieves efficient low-temperature desorption of polycyclic aromatic hydrocarbons, reduces energy consumption, and can effectively separate and recover post-treatment additives, thereby improving soil treatment efficiency and economy.

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Abstract

This invention relates to an additive for thermal desorption of polycyclic aromatic hydrocarbon (PAH) contaminated soil and its preparation method. It utilizes a composite oxide of manganese, rare earth metals, and transition metals to oxidize PAHs into low-carbon molecules during thermal desorption, achieving efficient removal, lowering the thermal desorption temperature, and saving energy consumption. The lower thermal desorption temperature reduces the loss of organic matter in the soil, facilitating the secondary use of the treated soil. The prepared composite oxide has a hollow spherical structure, which promotes sufficient contact and rapid reaction between PAHs and the composite oxide. The doping of transition metal elements into the manganese oxide and cerium oxide lattices creates oxygen vacancy defects, further enhancing the catalytic oxidation performance. Loading the manganese, rare earth metal, and transition metal composite oxide onto the surface of Fe3O4 improves its dispersion. Utilizing the magnetic properties of Fe3O4, the additive can be separated from the soil after desorption treatment, allowing for recycling.
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