| Summary: | 碩士 === 嘉南藥理科技大學 === 環境工程與科學系暨研究所 === 97 === In this study, the Fe0/CO2 process was investigated for removing nitrate from aqueous solution under different operating conditions such as initial pH(4、6、8、10)、Fe0 dosage (0.25、0.5), initial nitrate concentration (50、100、200 mg/L) and different aeration gase on the removal of nitrate from aqueous solution by chemical reduction. The solution pH, ORP, DO, were also monitored in order to get the best conditions for nitrate remediation. This experiment is try to removed aqueous nitrate by nFe0 coupled with dioxide bubble in physical way.
The results shows that the removals of aqueous nitrate reduced by NZVI under initial NO3- concerntation at 100 mg/L, Fe0 dosage at 0.25 g、0.5 g conditions were 15% and 38%, respectively. The result indicated that the higer Fe0 dosage, the lower will be the residue nitrate. At initial pH 6,8 and10 the removals of NO3- almost the same . However, when solution initial pH at 4 a lower removal of NO3- was observed. The nitrogen gas used to purge dissolved oxygen is better in terms of NO3- removal than using CO2.
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