1997 Fiscal Year Final Research Report Summary
Electro-Chemical Reduction of Nitrate in Underground Water and Regeration Waste Water of Ion-exchange resin
| Project/Area Number |
07555173
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Yamanashi University |
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Principal Investigator |
NAKAMURA Fumio Yamanashi University Facul.of Eng.Professor, 工学部, 教授 (60077203)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAKE Uusaku Orugano Co.Dept.Global Env.Head of dept., 地球環境部, 部長(研究職)
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| Project Period (FY) |
1995 – 1997
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| Keywords | Nitrate reduction / Electrolysis / Regeneration waste / Reduction efficiency / 塩素イオンの再生利用 / 交換樹脂再生廃液 |
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| Research Abstract |
Electro-chemical reduction of Nitrate in underground water and regeration waste water of Ion-exchange resin were investigated in this research.
Research results may be summarized as follows.
(1) Concentration of Cl^-, NO_3^-, SO_4^<2-> in regeration waste water of anion^- exchange resin (IRA-400) was in the order of g/l.
(2) Although the change in concentration of SO_4^<2->, CO_3^<2-> was not found, NO_3^- was reducted only in the camber of cathode, and produced NO_2^-, NH_4^+, N_2, NO,NH_3
(3) Cl^- was oxidized in the anode, and produced Cl_2 and HC10
(4) It was found that main part of gas prodused in cahode was H_2, and O_2 in anode
(5) It was found that reduction rate was proportional to the applied electric current, electrolysis time and electric power, however, it has reached to the maximum at around 5A,90 min and 50 Wh. Therefore, it was estimated that electriccurrent and electrolysis time should be set to 4-5A and 60 min from the viewpoint of reduction efficiency.
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