Combined treatment method of petroleum-contaminated soil

US11292038B2 · kind B2 · utility

Assignee

• China University of Petroleum · CN

Inventors

• Dong Hui Liu · Beijing, CN
• Shuhai Guo · Qingdao, CN
• Wei Zhu · Longbeilingcun, CN
• Fushan Wen · Qingdao, CN
• Nan Shi · Newark, US
• Yu Qiu · Chongqing, CN
• Xiaoning Feng · Beijing, CN
• Bo Wu · Cambridge, US
• Gang Li · Beijing, CN
• Changlong Yin · Qingdao, CN
• Xiujie Yang · Qingdao, CN
• Dehui KONG · Longbeilingcun, CN
• Hongbo Dai · Qingdao, CN
• Mengfei LI · Qingdao, CN
• Sa Wang · Shenyang, CN

Key dates

• Filing date: Oct 19, 2020
• Grant date: Apr 5, 2022
• Expiry date: Oct 19, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01G49/0018
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A combined remediation method of petroleum-contaminated soil includes: impurity removal pretreatment, photocatalytic pre-oxidation, stepwise thermal desorption of petroleum from soil, and high-temperature oxidation; with iron-titanium composite metal oxide (ITCMO) as a catalyst, conducting oxidation pretreatment under light conditions so that some cross-linked structures in macromolecular petroleum contaminants are broken and degraded; and conducting stepwise pyrolysis to achieve a removal rate of more than 98.00%. The new method adopts a combined remediation technology of photocatalytic pre-oxidation-stepwise pyrolysis, which realizes a relatively-high removal rate of petroleum hydrocarbons and the efficient and harmless remediation of high-concentration petroleum-contaminated soil, and remedied soil can be reused.