公开(公告)号：US10550026B2

公开(公告)日：2020-02-04

申请号：US15119234

申请日：2015-02-10

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Shuhei Izawa

IPC: C02F9/00 ,  C02F1/52 ,  C02F1/72 ,  C02F101/16 ,  C02F1/02 ,  C02F1/66 ,  C02F1/74 ,  C02F101/20 ,  C02F103/16 ,  C02F1/56

Abstract: A method for treating ammonia-containing water containing ammonia, metal ions that form a complex with ammonia, and a reducing substance includes a first step of oxidizing the reducing substance by adding hydrogen peroxide to the ammonia-containing water; a second step of aerating the resultant water treated in the first step to remove the ammonia; a third step of forming an insoluble solid at a pH of 7 to 12 by adding at least one compound selected from the group consisting of iron salts, aluminum salts, calcium salts, and calcium hydroxide to the water treated in the second step; and a fourth step of separating the insoluble solid formed in the third step by solid-liquid separation.

公开(公告)号：US09533895B2

公开(公告)日：2017-01-03

申请号：US14713653

申请日：2015-05-15

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Shuhei Izawa

IPC: C02F1/52 ,  C02F1/28 ,  C02F1/00 ,  C02F1/68 ,  C02F101/14 ,  C02F103/34

CPC classification number: C02F1/281 ,  C02F1/001 ,  C02F1/5236 ,  C02F1/683 ,  C02F2101/14 ,  C02F2103/346

Abstract: A device for treating fluorine-containing water includes a fluorine treating unit treating the fluorine-containing water in which calcium carbonate packed towers are arranged in series in a plurality of stages; a fluorine passing unit passing the fluorine-containing water through the fluorine treating unit; an extracting unit extracting treated water from the fluorine treating unit; and a recovery unit recovering calcium fluoride from the calcium carbonate packed towers.

Abstract translation: 一种处理含氟水的装置包括处理含有多个阶段中的碳酸钙填充塔串列排列的含氟水的氟处理单元; 氟通过单元使含氟水通过氟处理单元; 提取单元，从所述氟处理单元中提取处理水; 以及从碳酸钙填充塔回收氟化钙的回收单元。

公开(公告)号：US11286181B2

公开(公告)日：2022-03-29

申请号：US16347431

申请日：2017-09-12

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Shuhei Izawa ,  Ippei Tanaka

IPC: C02F1/52 ,  C02F1/58 ,  C02F1/62 ,  C02F9/00 ,  C02F11/122 ,  C02F101/10 ,  C02F101/14 ,  C02F101/20 ,  C02F103/16 ,  C02F1/00

Abstract: A calcium fluoride precipitation inhibitor is added to waste water containing sulfuric acid, fluorine (fluoride ions and hydrogen fluoride) and heavy metal ions to generate pretreated water. A calcium compound is added to the pretreated water to generate a first insolubilized product at a pH of less than 5, followed by solid-liquid separation. A calcium compound is added to a first separated water after the solid-liquid separation to generate a second insolubilized product at a pH of 3 to 7 (provided that the pH is a pH higher than in the first reaction step), followed by solid-liquid separation. An alkali is added to a second separated water after the solid-liquid separation to give a pH of 8 or more, thereby generating a third insolubilized product, followed by solid-liquid separation.