Title:
METHOD AND APPARATUS FOR TREATMENT OF WATER CONTAINING ORGANIC MATERIAL
Document Type and Number:
WIPO Patent Application WO/2012/093573
Kind Code:
A1
Abstract:
[Problem] The purpose is, in an organic-material-containing water treatment comprising subjecting a biologically treated sludge of the organic-material-containing water to a solid/liquid separation procedure with a separation membrane and subjecting water that has passed through the separation membrane to an RO membrane separation treatment, and when a washing solution is passed through the membrane from the passed water side to the concentrated water side to wash the membrane while an ordinary solid/liquid separation treatment is stopped, to prevent the reduction in flux of the RO membrane due to a TOC component eluted from the sludge, to reduce the frequency of a chemical washing procedure for the RO membrane, to increase the water collection rate and to achieve a steady and efficient treatment.
[Solution] When the solid/liquid separation is re-operated after the washing of the membrane, water that has passed through the membrane is adjusted to pH 9.5 or higher, a scale formation inhibitor is added to the water, and subsequently the RO membrane separation treatment is carried out. The adsorption of the TOC component eluted from the sludge onto the RO membrane can be prevented and the formation of any slime can also be prevented by adjusting RO supply water to a high alkaline pH value of 9.5 or higher and adding the scale formation inhibitor. In this manner, the reduction in flux of the RO membrane can be prevented.
Inventors:
TANAKA, Yu (4-7 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 83, 〒1608383, JP)
Application Number:
JP2011/079164
Publication Date:
July 12, 2012
Filing Date:
December 16, 2011
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)
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)
International Classes:
C02F1/44; B01D61/04; B01D61/58; B01D65/06; C02F3/12; C02F5/00; C02F5/10; C02F5/12; C02F5/14
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi (Nissin bldg, 9F 5-10, Shinjuku 2-chome, Shinjuku-k, Tokyo 22, 〒1600022, JP)
Claims: