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Denitrifying bioreactors are an innovative nitrate-reduction strategy that reduces NO3-N with carbon substrate. In this study, application of biochar as a carbon substrate in DNBRs and the effect of biochar application rate and bioreactor heights on nitrate and ammonium concentration in the laboratory were investigated. Four mixtures of soil–biochar–wheat straw content of B0 = 0 (control treatment), B1 = 10, B2 = 20, and B3 = 30 percent of biochar were used. Also, to evaluate the effect of bioreactors heights, four heights 30, 60, 90, and 120 cm were used. The results showed that the nitrate concentration removal for control, B1, B2, and B3 treatment was 74.5, 81, 86.4, and 90.6% and biochar application rate, and bioreactor height have a significant effect on NO3-N removal and ammonium concentration. The results also showed that NO3-N removal and ammonium concentration increased with time. The effluent pH value of bioreactors does not have any particular trend during the experiment.
International Journal of Environmental Research – Springer Journals
Published: Apr 18, 2020
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