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Effects of water characteristics on nitrate reduction by the Fe^0/CO"2 process [An article from: Chemosphere]
Description
This digital document is a journal article from Chemosphere, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
In this study, CO"2 was bubbled into Fe^0-contained solution to create an acidic environment favorable to reduction of aqueous nitrate under various water qualities. Results showed that nitrate of 30mgl^-^1 could be removed from solutions almost completely within 30min under the conditions of 2gFe^0l^-^1 and CO"2 bubbling flow rate of 200mlmin^-^1. It was observed from the Fe^0/CO"2 system that one mole of nitrate reduced by Fe^0 led to the formation of 6.6mol of ferrous ions. The removal of nitrate increases with increasing Fe^0 dosage, however, the removal makes no difference as the Fe^0 is applied at a relatively higher dosage. In the system with various water qualities, nitrate removal was inhibited significantly in the presence of humic acid. Calcium ions strongly retard nitrate removal, whereas chloride ions promote the reduction of nitrate in a significant way. Sodium ions impose only slight inhibitive effect on nitrate removal. Water molecule in the studied system can be of significance due to its competitive capability of electrons released from Fe^0.
Description:
In this study, CO"2 was bubbled into Fe^0-contained solution to create an acidic environment favorable to reduction of aqueous nitrate under various water qualities. Results showed that nitrate of 30mgl^-^1 could be removed from solutions almost completely within 30min under the conditions of 2gFe^0l^-^1 and CO"2 bubbling flow rate of 200mlmin^-^1. It was observed from the Fe^0/CO"2 system that one mole of nitrate reduced by Fe^0 led to the formation of 6.6mol of ferrous ions. The removal of nitrate increases with increasing Fe^0 dosage, however, the removal makes no difference as the Fe^0 is applied at a relatively higher dosage. In the system with various water qualities, nitrate removal was inhibited significantly in the presence of humic acid. Calcium ions strongly retard nitrate removal, whereas chloride ions promote the reduction of nitrate in a significant way. Sodium ions impose only slight inhibitive effect on nitrate removal. Water molecule in the studied system can be of significance due to its competitive capability of electrons released from Fe^0.
