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:
Mar. 13, 2018
Filed:
Mar. 30, 2015
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Masayuki Eda, Tokyo, JP;
Susumu Okino, Tokyo, JP;
Ryuji Yoshiyama, Tokyo, JP;
Hideaki Sakurai, Tokyo, JP;
Nobuyuki Ukai, Tokyo, JP;
Hideo Suzuki, Tokyo, JP;
Hiroshi Nakashoji, Tokyo, JP;
Shigeru Yoshioka, Tokyo, JP;
MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
In a water treatment system and a water treatment process, a scale inhibitor is supplied to water to be treated containing Ca ions, SOions, carbonate ions, and silica, and the water to be treated is adjusted to a pH at which silica is soluble. The pH-adjusted water containing the calcium scale inhibitor is separated in a first demineralizing section into concentrated and treated water. In a first crystallizing section, seed crystals of gypsum are supplied to the first concentrated water, whereby gypsum is crystallized and removed from the first concentrated water. Silica in the water to be treated is removed from the first concentrated water on the downstream side of the first crystallizing section. Calcium carbonate in the water to be treated is removed from the first concentrated water on the upstream side of the first demineralizing section or the downstream side of the first crystallizing section.