Jfe Engineering Corporation

Yasuhiro Minamizato

Takeshi Tsuji

Eri Watanabe

Shigeki Fujiwara

Koji Fuchigami

Yohei Tomida

Yasuto Ando

Yoshitaka Moriyama

A method and apparatus for removing soluble silica efficiently from accompanied water, produced from wells containing calcium ion, soluble silica, and sulfate ion, and not clogging a reverse osmosis membrane in the reverse osmosis membrane treatment process after that, includes adding a magnesium salt to mix with the accompanied water under alkaline conditions to produce insoluble silica and calcium sulfate. A microfiltration (MF) membrane treatment process includes treating a first reaction solution obtained in said magnesium salt adding process, with a microfiltration membrane to separate insolubilized silica and calcium sulfate by filtration. An acid adding process includes adding an acid to and mixing with filtrate obtained in the MF membrane treatment process to render a pH value of the filtrate on the range from 5 to 9 and a negative Langeliar saturation index. A reverse osmosis membrane treatment process includes treating a second reaction solution, obtained in the acid adding process, with a reverse osmosis membrane to obtain fresh water and membrane concentrates.

Method and apparatus for treating accompanied water from a well

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Tokyo, Japan

Yasuhiro Minamizato