DENITRIFYING COMPOSITION FOR REMOVING NITRATE NITROGEN AND PROCESS FOR PRODUCING THE SAME

Title:

DENITRIFYING COMPOSITION FOR REMOVING NITRATE NITROGEN AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2000/018694

Kind Code:

A1

Abstract:

A denitrifying composition which is a material for use in decomposing the nitrate nitrogen contained in wastewater with the aid of sulfur-oxidizing bacteria for which sulfur and carbonates are nutrients, characterized by comprising calcium carbonate particles dispersed in sulfur. The composition preferably comprises 10 parts by weight of sulfur and, coexistent therewith, 10 to 15 parts by weight of calcium carbonate and 1 to 3 parts by weight of a microporous substance. The composition is obtained by heating a calcium carbonate powder together with sulfur to melt the sulfur, dispersing the calcium carbonate particles in the liquid sulfur, and rapidly cooling the mixture to solidify it. Stable denitrification is possible with this composition even without incorporation of any other ingredient because the composition contains both of a nutrient and an alkali source.

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Inventors:

YATAGAI ATSUSHI (JP)
MASUJIMA HIROSHI (JP)
YABE TAKUMA (JP)
GUNJI TOMOMICHI (JP)
OISHI TORU (JP)

Application Number:

PCT/JP1999/005226

Publication Date:

April 06, 2000

Filing Date:

September 24, 1999

Export Citation:

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Assignee:

NITCHITSU CO LTD (JP)
NIPPON STEEL CHEMICAL CO (JP)
YATAGAI ATSUSHI (JP)
MASUJIMA HIROSHI (JP)
YABE TAKUMA (JP)
GUNJI TOMOMICHI (JP)
OISHI TORU (JP)

International Classes:

C02F3/28; C02F3/34; C12S99/00; C02F3/00; (IPC1-7): C02F3/34; C02F3/10

Foreign References:

JPS5390192A	1978-08-08
JPH0131958B2	1989-06-28
JPH049119B2	1992-02-19

Other References:

P. LE CLOIREC ET AL.: "Total dissolved inorganic nitrogen removal with two coupled autotrophic biological nitrification and denitrification processes-laboratory studies", AQUA,, vol. 39, no. 1, 1990, pages 16 - 23, XP002925777
See also references of EP 1129996A4

Attorney, Agent or Firm:

Naruse, Katsuo (Nishi-shinbashi 2-chome Minato-ku Tokyo, JP)

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