Production method and production device for water for pure water, and production method and production system for pure water
AssigneeNomura Micro Science Co., Ltd.
InventorsMasamitsu Iiyama, Hiroki Miyazawa, Yoshihiro Akimoto
Life of this patent
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Abstract
A production method for water for pure water includes adding polyaluminum chloride to raw water to produce first treated water, and filtering the first treated water in two or more stages including filtering with a filtration membrane device in a preceding stage to produce first concentrated water, and filtering the first concentrated water with a filtration membrane device in a subsequent stage. The water for pure water is produced as permeated water produced by the filtering in the two or more stages.
Claims8
A production method for water for pure water, the production method comprising:
- adding polyaluminum chloride to raw water to produce first treated water;
- and
- two or more filtering stages comprising:
- filtering the first treated water containing polyaluminum chloride with a filtration membrane device in a preceding stage, to produce first concentrated water;
- and
- filtering the first concentrated water with a filtration membrane device in a subsequent stage, to produce the water for pure water as permeated water from the filtering in the two or more filtering stages,
- wherein both of the filtration membrane device in the preceding stage and the filtration membrane device in the subsequent stage comprise at least one of an ultrafiltration membrane and a microfiltration membrane.
A production method for pure water, the production method comprising, in order:
- producing water for pure water by adding polyaluminum chloride to raw water to produce first treated water, and
- two or more filtering stages comprising:
- filtering the first treated water containing polyaluminum chloride with a filtration membrane device in a preceding stage, to produce first concentrated water;
- and filtering the first concentrated water with a filtration membrane device in a subsequent stage, to produce the water for pure water as permeated water produced by the filtering in the two or more filtering stages, wherein both of the filtration membrane device in the preceding stage and the filtration membrane device in the subsequent stage comprise at least one of an ultrafiltration membrane and a microfiltration membrane;
- and
- performing ultraviolet oxidation and performing ion exchange.
Dependencies are inferred from the claim text.