Abstract: Provided is a portable XRF data screening method for heavy metal contaminated soil, relating to the technical field of heavy metal contamination test. The method includes the following steps: (1) laboratory test; (2) XRF test; and (3) calculation of a recheck interval: dividing test data into four areas by a contaminant screening value Xc as a horizontal line and a correlation-derived site screening value as a vertical line to calculate the recheck interval. The method is simple and efficient, and is beneficial to saving investigation costs and shortening a project cycle.
Type:
Grant
Filed:
December 21, 2022
Date of Patent:
July 11, 2023
Assignee:
BEIJING MUNICIPAL RESEARCH INSTITUTE OF ENVIRONMENTAL PROTECTION
Inventors:
Lina Zhang, Lin Jiang, Tianxiang Xia, Xiaoying Zhu
Abstract: A filter element for coupling adsorption and regeneration of volatile organic compounds and a purification device are provided. The filter element includes a filter element body, a photocatalytic mechanism and adsorption-filtration body(s). The adsorption-filtration body(s) may be of a hollow columnar structure where the photocatalytic mechanism is located. VOCs are quickly adsorbed by the adsorption-filtration body(s), then thermal desorption regeneration is performed on the adsorption-filtration body(s) during a time interval of stopping discharging of the exhaust gas, and a photocatalysis technology is used to cyclically purify the thermally desorbed VOCs, which achieves the synergy of high-density and purification in the two technologies. Furthermore, it takes full advantages of high adsorption, filtration and purification efficiency, low photolysis catalysis costs, and easy operation and maintenance of the on-site regeneration.
Type:
Application
Filed:
June 17, 2021
Publication date:
September 29, 2022
Applicant:
BEIJING MUNICIPAL RESEARCH INSTITUTE OF ENVIRONMENTAL PROTECTION
Inventors:
Aijun SHI, Lei NIE, Wanqing HE, Tianyi WANG, Zhen YAO, Zhiping WANG