Techno Press

Advances in Environmental Research   Volume 4, Number 4, December 2015, pages 263-271
Nitrate reduction by iron supported bimetallic catalyst in low and high nitrogen regimes
Shanawar Hamid and Woojin Lee

Abstract     [Full Text]
    In this study, the effect of initial nitrate loading on nitrate removal and byproduct selectivity was evaluated in a continuous system. Nitrate removal decreased from 100% to 25% with the increase in nitrate loading from 10 to 300 mg/L NO3-N. Ammonium selectivity decreased and nitrite selectivity increased, while nitrogen selectivity showed a peak shape in the same range of nitrate loading. The nitrate removal was enhanced at low catalyst to nitrate ratios and 100% nitrate removal was achieved at catalyst to nitrate ratio of ≥ 33 mg catalyst / mg NO3-N. Maximum nitrogen selectivity (47%) was observed at 66 mg catalyst / mg NO3-N, showing that continuous Cu-Pd-NZVI system has a maximum removal capacity of 37 mg NO3- -N/gcatalyst /h. The results from this study emphasize that nitrate reduction in a bimetallic catalytic system could be sensitive to changes in optimized regimes.
Key Words
    Cu-Pd bimetallic catalyst; catalytic nitrate reduction; NZVI; reduction capacity; continuous system
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.

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