Sasakura Engineering Co., Ltd.

Sharp Kabushiki Kaisha Corporation

Junji Mizutani

Yasushi Nishimura

Yutaka Shiomi

Koji Harada

Yoshiyuki Hatano

Toshiaki Muratani

Mitsuo Maeda

Kozo Fujita

Yo Fujimoto

Tamito Mukaida

Tatsuya Taguchi

Yoshio Tanimoto

The present invention provides an aqueous solution evaporative treatment method that makes it possible to efficiently perform evaporative treatment of an aqueous solution containing calcium, magnesium, and silica. The aqueous solution evaporative treatment method comprises a seed crystal mixing step of adding to and mixing with an aqueous solution containing calcium, magnesium, and silica at least any one of magnesium salt and silicate together with calcium salt as seed crystals, and an evaporative concentration step of evaporatively concentrating the aqueous solution together with the seed crystals.

Evaporative treatment method for aqueous solution

The invention provides a hydrofluoric acid wastewater treatment method that achieves efficient recovery of hydrofluoric acid from hydrofluoric acid wastewater and also achieves sufficient reduction in the hydrofluoric acid concentration of the dehydrofluorinated water after treatment. The hydrofluoric acid wastewater treatment method comprises the following steps:

Hydrofluoric acid wastewater treatment method and device

A method and apparatus for treating the distilled water obtained from an evaporation process sea water desalination plant is provided wherein carbon dioxide is extracted from sea water in the high temperature stages of the desalination plant and where the carbon dioxide thus extracted is dissolved into the water, along with calcium, thereby converting the distilled water into the quality suited for city tap water.

Aftertreatment method and apparatus for distilled water

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Osaka, Japan

Junji Mizutani