The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 12, 2022
Filed:
Jul. 02, 2020
Shimizu Corporation, Tokyo, JP;
Mitsuo Mouri, Tokyo, JP;
SHIMIZU CORPORATION, Tokyo, JP;
Abstract
A washing treatment system for contaminated soil, including: a classifier that is configured to obtain a sand fraction having a particle size within a predetermined range and a fine-grained fraction having a particle size smaller than the predetermined range, from contaminated soil containing one or more contaminants selected from dioxins and agricultural chemicals; a detaching/washing unit that is configured to detach a contaminant particle containing the from a surface of the sand fraction; a removal unit that is configured to generate air bubbles in a presence of water containing a flotation chemical, allows the detached contaminant-bearing particles to attach to the air bubbles to form froth, and removes the froth to obtain a first slurry containing primary purified soil; and an up-flow washing unit that is provided downstream of the removal unit, and is configured to supply the first slurry into up-flow water to purify the primary purified soil.