廢水中高濃度硝酸根之化學還原

廖適杰

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廢水中高濃度硝酸根之化學還原

The Chemical Reduction of Wastewater Containing Nitrate in High Concentration

廖適杰 , Masters　　Advisor：黃孟槺　　

繁體中文

硼氫化鈉；硝酸根；氫氧化銅；硫酸銅；氧化還原電位； Sodium Borotryhydride ； Nitrate ； Copper Hydroxide ； Copper Sulfate ； ORP

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In this study, sodium borotryhydride (NaBH4) was used to reduce the wastewater containing nitrate in high concentration. Experiments were conducted by preparing sodium nitrate(NaNO3) solution in high concentration as simulated wastewater, followed by adding different amounts of copper sulfate(CuSO4) or copper hydroxide(Cu(OH)2) as the catalyst for this chemical reaction. Keeping the solution in the temperature of 60℃ for one hour and observed the pH value and oxidant reduction potential (ORP) change. The sodium hydroxide(NaOH) solution with the concentration of 5N were selectively been added into some samples to adjust the solution into an alkaline condition with a pH value of 10. Ion chromatography(IC) was been chosen to detect the nitrate and nitrite concentration in the solution. Different amounts of CuSO4, Cu(OH)2, and NaBH4, were investigated to find the removal effect of nitrate, as well as the pH and ORP value in the solution. This experiment can treat the simulated wastewater with the concentration up to 11297ppm. When the CuSO4 was been added as the catalyst, the nitrate removal rate was up to 81%. In some samples which were been added CuSO4 and then adjusted the pH value to alkali or used Cu(OH)2 as the catalyst, the removal rate of nitrate was up to 90% or even complete removal. The nitrate and nitrite reduction could not be happened without the addition of Cu(OH)2 or CuSO4. The removal rate of nitrate would get better by adjusting pH to the higher level. When the initial concentration of nitrate is getting higher, the removal rate of nitrate would almost the same by adding CuSO4 or Cu(OH)2. But by considering the cost and availability, CuSO4 would be the best choice as the catalyst in this NaBH4 reduction reaction.

Reference ( 50 ) 〈TOP〉

【7】 M. Carney, “European Drinking Water Standards,” J. AWWA, 83:6:48, 1991.
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【9】 Westerhoff P., James J. “Nitrate removal in zero-valent iron packed columns,” Water Research 37, pp.1818-1830, 2003.
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【13】 N. N. Hantzsche, and E. J. Finnemore, “Predicting ground water nitrate-nitrogen impact” , Ground Water , vol. 30, 1992, pp. 490-499
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【16】黃國書，“電化學方法去除螯合性銅及硝酸鹽之研究”，朝陽科技大學碩士論文，2009。
連結：
【17】 P. A. Haas, “Catalyzed reduction of nitrate in aqueous solutions,” Oak Ridge National Laboratory, ORNL/TM-12800, 1994.
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