Water treatment method and water treatment apparatus
AssigneeYokogawa Electric Corporation
InventorYasuhiro Matsui
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Abstract
A water treatment method includes a microbubble generating step (S101) of generating microbubbles in water to be treated containing at least calcium ions and producing water to be treated containing microbubbles, a water softening step (S102) of crystallizing calcium ions contained in the water to be treated containing the microbubbles as calcium carbonate and removing the calcium carbonate, and a reverse osmosis membrane treatment step (S103) of separating the water to be treated, from which the calcium carbonate has been removed, into reverse osmosis membrane treated water and reverse osmosis membrane concentrated water using a reverse osmosis membrane.
Claims14
A water treatment method comprising:
- a microbubble generating step of generating microbubbles in water to be treated containing calcium ions and producing water to be treated containing microbubbles;
- a water softening step of crystallizing the calcium ions contained in the water to be treated containing the microbubbles as calcium carbonate and removing the calcium carbonate;
- a reverse osmosis membrane treatment step of separating the water to be treated, from which the calcium carbonate has been removed, into reverse osmosis membrane treated water and reverse osmosis membrane concentrated water using a reverse osmosis membrane;
- a preliminary reverse osmosis membrane treatment step of separating the water to be treated containing the calcium ions using a reverse osmosis membrane into preliminary reverse osmosis membrane treated water and into preliminary reverse osmosis membrane concentrated water that is directed to the microbubble generating step;
- an electrodialysis step of separating some of the water to be treated, from which the calcium carbonate has been removed in the water softening step, into electrodialysis concentrated water and electrodialysis diluted water through electrodialysis treatment;
- and
- an electrolysis step of electrolyzing some of the electrodialysis concentrated water and obtaining an acidic aqueous solution and an alkaline aqueous solution.
A water treatment apparatus comprising:
- a microbubble generating apparatus configured to generate microbubbles in water to be treated containing calcium ions and produce water to be treated containing microbubbles;
- a crystallization apparatus configured to crystallize the calcium ions contained in the water to be treated containing the microbubbles as calcium carbonate and remove the calcium carbonate;
- a reverse osmosis membrane treatment apparatus configured to separate the water to be treated, from which the calcium carbonate has been removed, into reverse osmosis membrane treated water and reverse osmosis membrane concentrated water using a reverse osmosis membrane;
- a preliminary reverse osmosis membrane treatment apparatus using a reverse osmosis membrane configured to separate the water to be treated containing the calcium ions into preliminary reverse osmosis membrane treated water and into preliminary reverse osmosis membrane concentrated water directed to the microbubble generating apparatus;
- an electrodialysis apparatus configured to separate some of the water to be treated, from which the calcium carbonate has been removed by the crystallization apparatus, into electrodialysis concentrated water and electrodialysis diluted water through electrodialysis treatment;
- and
- an electrolysis apparatus configured to electrolyze some of the electrodialysis concentrated water and obtain an acidic aqueous solution and an alkaline aqueous solution.
Dependencies are inferred from the claim text.