Title:
METHOD FOR RECOVERING WATER AND METALS FROM PLATING WASTEWATER RESULTING FROM WASHING
Document Type and Number:
WIPO Patent Application WO/2010/143623
Kind Code:
A1
Abstract:
A method for water and metal recovery from a plating wastewater resulting from washing is disclosed with which water and metals are efficiently recovered from the plating wastewater, the method comprising an iron insolubilization step in which the pH of the plating wastewater is regulated to 3-6 in the presence of an oxidizing agent to oxidize divalent iron ions contained in the liquid to trivalent iron ions and precipitate an iron hydroxide, a solid-liquid separation step in which the water treated in the iron insolubilization step is subjected to solid-liquid separation by means of a microfiltration membrane, an ultrafiltration membrane, or a filter, a reverse osmosis membrane separation step in which the water separated in the solid-liquid separation step is treated with a reverse osmosis membrane and the filtrate water is taken as treated water out of the system, and a crystallization step in which an alkali is added to the high-concentration water resulting from the reverse osmosis membrane separation step and the metals contained in the liquid are precipitated as carbonates by a crystallization method in which acid-insoluble particles are used as seed crystals.
Inventors:
SUMIDA, Ichiro (4-7 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 83, 〒1608383, JP)
住田 一郎 (〒83 東京都新宿区西新宿三丁目４番７号 栗田工業株式会社内 Tokyo, 〒1608383, JP)
MURAMATU, Yuichi (4-7 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 83, 〒1608383, JP)
住田 一郎 (〒83 東京都新宿区西新宿三丁目４番７号 栗田工業株式会社内 Tokyo, 〒1608383, JP)
MURAMATU, Yuichi (4-7 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 83, 〒1608383, JP)
Application Number:
JP2010/059680
Publication Date:
December 16, 2010
Filing Date:
June 08, 2010
Export Citation:
Assignee:
KURITA WATER INDUSTRIES LTD. (4-7 Nishishinjuku 3-chome, Shinjuku-ku Tokyo, 83, 〒1608383, JP)
栗田工業株式会社 (〒83 東京都新宿区西新宿三丁目４番７号 Tokyo, 〒1608383, JP)
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, chiyoda-ku Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
SUMIDA, Ichiro (4-7 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 83, 〒1608383, JP)
栗田工業株式会社 (〒83 東京都新宿区西新宿三丁目４番７号 Tokyo, 〒1608383, JP)
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, chiyoda-ku Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
SUMIDA, Ichiro (4-7 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 83, 〒1608383, JP)
International Classes:
C02F9/00; B01D9/02; C02F1/44; C02F1/62; C02F1/64; C02F1/72; C22B3/44; C22B7/00; C22B19/30; C22B23/00; C25D21/20
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi (Nissin bldg, 9F 5-10, Shinjuku 2-chome, Shinjuku-k, Tokyo 22, 〒1600022, JP)
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