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Title:
METHOD FOR TREATING WASTE WATER HAVING HIGH HARDNESS
Document Type and Number:
WIPO Patent Application WO/2017/159303
Kind Code:
A1
Abstract:
A method for treating waste water having high hardness according to one embodiment of the present invention is a method for treating waste water having high hardness, specifically a calcium hardness of 100 or more, and this method comprises: a step for adding a flocculant into the waste water having high hardness; a step for roughly filtering the waste water having high hardness after the flocculant addition step by means of a filter; a step for subjecting the waste water having high hardness after the rough filtration step to membrane filtration with use of a microfiltration membrane or an ultrafiltration membrane; and a step for backwashing the microfiltration membrane or the ultrafiltration membrane with an acidic water. It is preferable that the flocculant is a polyaluminum chloride. It is preferable that the acidic water contains hydrochloric acid or citric acid. It is preferable that this method additionally comprises a step for subjecting the waste water having high hardness after the membrane filtration step to membrane filtration with use of a reverse osmosis membrane. It is preferable that the filter is composed of anthracite. It is preferable that the waste water having high hardness is biologically treated sewage water.

Inventors:
SATO Nagahisa (950, Asashiro-nishi 1-chome, Kumatori-cho, Sennan-gu, Osaka 58, 〒5900458, JP)
TANAKA Hiromu (950, Asashiro-nishi 1-chome, Kumatori-cho, Sennan-gu, Osaka 58, 〒5900458, JP)
IDA Kiyoshi (950, Asashiro-nishi 1-chome, Kumatori-cho, Sennan-gu, Osaka 58, 〒5900458, JP)
MORITA Toru (950, Asashiro-nishi 1-chome, Kumatori-cho, Sennan-gu, Osaka 58, 〒5900458, JP)
Application Number:
JP2017/007276
Publication Date:
September 21, 2017
Filing Date:
February 27, 2017
Export Citation:
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Assignee:
SUMITOMO ELECTRIC INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
International Classes:
C02F1/44; B01D21/01; B01D24/00; B01D29/01; B01D61/04; B01D61/16; B01D61/58; B01D65/06; C02F1/52; C02F9/02; C02F9/04; C02F9/14
Domestic Patent References:
WO2009119300A12009-10-01
WO2011016410A12011-02-10
Foreign References:
JP2013137279A2013-07-11
JP2010089071A2010-04-22
JP2009165928A2009-07-30
JP2012206066A2012-10-25
JP2012187467A2012-10-04
JP2004209478A2004-07-29
JP2001070763A2001-03-21
JP2014034006A2014-02-24
JP2011056411A2011-03-24
Attorney, Agent or Firm:
NAKATA Motomi et al. (1-3, Shimaya 1-chome, Konohana-ku, Osaka-sh, Osaka 24, 〒5540024, JP)
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