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A Novel Dielectric-Barrier-Discharge Loop Reactor for Cyanide Water Treatment

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Abstract

A novel dielectric-barrier-discharge (DBD) loop reactor was designed for the efficient degradation of cyanide anion (CN−) in water. The circulation of cyanide water as a falling film through plasma gas discharge zone enhanced gas–liquid mass and energy transfer and induced formation of H2O2 which was associated with the efficient destruction of CN−. It was observed that among different discharge gases, the CN− degradation rate decreased in the order of Ar > air > H2/air mixture. Depending on discharge voltage, the treatment time for complete removal of 100 ppm CN− in this DBD loop reactor is in the range 120–300 min. The dose of Cu2+ catalyst in combination with in situ production of H2O2 enhanced the destruction of CN− apparently in this DBD loop reactor. The treatment time for complete degradation of 100 ppm CN− decreased from 180 min with Ar DBD discharge alone to 40 min with 40 mg/L dose of Cu2+ ion in water, making it an efficient means to degrade cyanide water.

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Acknowledgement

The support of this work by the Fundamental Research Funds for the Central Universities (Grant No. 24720094028) is gratefully acknowledged.

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  1. Department of Chemical Engineering, China University of Petroleum Huadong, Qingdao, 266580, Shandong, China

    Bo Wang

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  1. Bo Wang
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Correspondence to Bo Wang.

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Wang, B. A Novel Dielectric-Barrier-Discharge Loop Reactor for Cyanide Water Treatment. Plasma Chem Plasma Process 37, 1121–1131 (2017). https://doi.org/10.1007/s11090-017-9791-0

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  • DOI: https://doi.org/10.1007/s11090-017-9791-0

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