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Nitrate reduction by iron supported bimetallic catalyst in low and high nitrogen regimes

  • Received : 2015.09.29
  • Accepted : 2015.12.03
  • Published : 2015.12.25

Abstract

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 $300mg/L\;NO_3-N$. 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 ${\geq}33mg\;catalyst/mg\;NO_3-N$. Maximum nitrogen selectivity (47%) was observed at $66mg\;catalyst/mg\;NO_3-N$, showing that continuous Cu-Pd-NZVI system has a maximum removal capacity of 37 mg $NO_3{^-}-N/g_{catalyst}/h$. The results from this study emphasize that nitrate reduction in a bimetallic catalytic system could be sensitive to changes in optimized regimes.

Keywords

Cu-Pd bimetallic catalyst;catalytic nitrate reduction;NZVI;reduction capacity;continuous system

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Cited by

  1. Reduction of nitrate in groundwater by hematite supported bimetallic catalyst vol.5, pp.1, 2016, https://doi.org/10.12989/aer.2016.5.1.051

Acknowledgement

Supported by : Ministry of Environment