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Decomposition of a High-Concentration Hydrazine in Wastewater from A Chemical Decontamination Process of A Nuclear Facility

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Abstract

Hydrazine (N2H4) can injure lungs, liver, kidney, and central nervous system, and it may be carcinogenic to humans. It is used for a chemical decontamination process (HyBRID) of a nuclear facility. After the decontamination process, wastewater containing a high concentration of hydrazine is generated. Thus, it is necessary to remove hydrazine from the wastewater by a safe level. The decomposition tests of hydrazine in wastewater surrogates were conducted in this study at various pH levels, molar ratios of H2O2/N2H4, and stirring rates. Through these tests, it was found that the decomposition of hydrazine can be promoted by Cu(OH)2 at pH of 9.0. Based on this result, a decomposition behavior of hydrazine was derived, and optimal conditions for the removal of hydrazine in a wastewater by a level of less than 10 ppb were determined. The optimal conditions were successfully demonstrated in a pilot-scale of chemical decontamination system.

Article Highlights

  • After a chemical decontamination process of a nuclear facility, wastewater containing a high concentration of hydrazine is generated.

  • The decomposition tests of hydrazine in wastewater surrogates were conducted at various conditions using H2O2.

  • It was found that the decomposition of hydrazine can be promoted by Cu(OH)2 at pH of 9.0.

  • Optimal conditions for the removal of hydrazine in a wastewater by a safe level of less than 10 ppb were determined.

  • The optimal conditions were successfully demonstrated in a pilot-scale of chemical decontamination system.

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Acknowledgements

The authors would like to express their appreciation for the support provided by the National Research Foundation of Korea (NRF), which is funded by the Ministry of Science, ICT and Future Planning (MSIP) of the Republic of Korea (NRF-2017M2A8A5015144).

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Authors and Affiliations

  1. Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, 34057, Republic of Korea

    Hee-Chul Eun, Sang-Yoon Park, Seon-Byeong Kim & Bum-Kyoung Seo

  2. Department of Applied Chemistry and Biological Engineering, Chungnam National University, Daehakro 99, Yuseong-gu, Daejeon, Republic of Korea

    Jun-Young Jung & Jung-Soon Park

  3. Department of Nuclear Engineering, Hanyang University, Wangsimni-ro 222, Seongdong-gu, Seoul, Republic of Korea

    Na-On Chang

Authors
  1. Hee-Chul Eun
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  2. Jun-Young Jung
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  3. Sang-Yoon Park
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  4. Jung-Soon Park
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  5. Na-On Chang
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  6. Seon-Byeong Kim
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  7. Bum-Kyoung Seo
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Correspondence to Hee-Chul Eun.

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Eun, HC., Jung, JY., Park, SY. et al. Decomposition of a High-Concentration Hydrazine in Wastewater from A Chemical Decontamination Process of A Nuclear Facility. Int J Environ Res 14, 385–391 (2020). https://doi.org/10.1007/s41742-020-00260-7

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  • DOI: https://doi.org/10.1007/s41742-020-00260-7

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