Nitrate Removal by Fe0 and CO2 Process Using an Innovative Continuous Flow Reactor

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Title:	Nitrate Removal by Fe0 and CO2 Process Using an Innovative Continuous Flow Reactor
Authors:	Jin Anotai Chih-Hsiang Liao Chalermchai Ruangchanikom
Contributors:	環境資源管理系
Keywords:	Ammonium carbon dioxide nitrate, zero-valent iron
Date:	2010-02
Issue Date:	2012-05-31 14:49:41 (UTC+8)
Abstract:	An innovative flow reactor was designed and tested for removing nitrate from aqueous solution in the presence of Fe0 and CO2. Important parameters explored in this study include CO2 bubbling rate (100-400 mL min-1), Fe0 dosage (40-80 g), influent nitrate concentration (30-200 mg L-1), and influent flow rate (50-200 mL min-1). The result shows that the initial nitrate of 23 mg N L-1 was reduced to 2.9 mg N L-1 (87% nitrate removed) after 2.5 h, given 50 mL min-1 of the influent rate, 60 g of Fe0 dosage, and 200 mL min-1 of CO2 bubbling rate. The higher CO2 bubbling rate helps reduce the reactor size, due to its enhancing effect on nitrate removal. To suppress the effluent nitrate level below its threshold limit, a measure can be manipulated by using higher Fe0 dosage and higher CO2 bubbling flow rate. In the field application, it is highly recommended to operate the system by step additions of desired Fe0 dose at proper time to maintain both the effluent nitrate and iron levels below their regulatory limits.
Relation:	Journal of environmental engineering and management 20(2)：p.77-84
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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