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Treatment of Aqueous Nitrate by Zero Valent Iron Powder in the Presence of CO 2 Bubbling
Author(s) -
Hsu ChiungYuan,
Liao ChihHsiang,
Lu MingChun
Publication year - 2004
Publication title -
groundwater monitoring and remediation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 47
eISSN - 1745-6592
pISSN - 1069-3629
DOI - 10.1111/j.1745-6592.2004.tb01305.x
Subject(s) - nitrate , chemistry , aqueous solution , ammonium , aeration , zerovalent iron , inorganic chemistry , ammonium nitrate , denitrification , nuclear chemistry , nitrogen , organic chemistry , adsorption
This paper investigates a process for the removal of nitrate from ground water by combination of Fe° and CO 2 bubblin*** The bubbling of CO 2 effectively creates an acidic environment favorable to Fe° corrosion, which results in nitrate reduction. I 10 min, the solution pH dropped to 3.2 with CO 2 inflow rate of 500 mL/min. In the presence of Fe° (2 g/L), the CO 2 bubblin (500 mL/min) induced conversion of nitrate‐N (∼7 mg/L) by 85% in 40 min. In addition, the end product in the reaction mi***xture was ammonium, which accounts for 90% to 104% of nitrate conversion with the presence of various iron dosages (0.5 t 2.0 g/L). Though the formation of ammonium is a drawback, the ammonium was eliminated from aqueous phase by a follow up treatment of settling (30 min) and air aeration (50 min).