Invention Grant
- Patent Title: Method for nitrogen removal from aqueous medium
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Application No.: US15508600Application Date: 2015-09-03
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Publication No.: US10167215B2Publication Date: 2019-01-01
- Inventor: Roderick Abinet
- Applicant: Kemira Oyj
- Applicant Address: FI Helsinki
- Assignee: Kemira Oyj
- Current Assignee: Kemira Oyj
- Current Assignee Address: FI Helsinki
- Agency: Berggren LLP Law Firm
- International Application: PCT/FI2015/050576 WO 20150903
- International Announcement: WO2016/034774 WO 20160310
- Main IPC: C02F3/30
- IPC: C02F3/30 ; C01B21/02 ; C01B21/22 ; C02F1/70 ; C02F3/00 ; C01B13/02 ; C02F101/16
Abstract:
The invention relates to a method for nitrogen removal from aqueous medium, comprising steps of (a) converting NH4+ in the aqueous medium to NO2− by partial aerobic nitrification, (b) partially reducing the obtained NO2− to N2O in anoxic conditions, and (c) decomposing N2O to N2 with energy recovery. A mixture of ferrous sulfate and ferric sulfate is used in step (b) for reduction of NO2− to N2O.
Public/Granted literature
- US20170275192A1 Method for nitrogen removal from aqueous medium Public/Granted day:2017-09-28
Information query
