Denitrifying bioreactors are an innovative nitrate-reduction strategy that reduces NO 3 -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 B 0 = 0 (control treatment), B 1 = 10, B 2 = 20, and B 3 = 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, B 1 , B 2 , and B 3 treatment was 74.5, 81, 86.4, and 90.6% and biochar application rate, and bioreactor height have a significant effect on NO 3 -N removal and ammonium concentration. The results also showed that NO 3 -N removal and ammonium concentration increased with time. The effluent pH value of bioreactors does not have any particular trend during the experiment. Effects of biochar in DNBRs on nitrate and ammonium removal was investigated. Biochar rate and bioreactor thickness affects nitrate and ammonium removal. Biochar rate and bioreactor height have effects on NO 3 −N and ammonium removal. NO 3 −N removal and ammonium concentration increased with time. The effluent pH value does not have any particular trend during the experiment.

中文翻译：

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小麦秸秆生物炭对实验室反硝化生物反应器硝酸盐去除的影响

反硝化生物反应器是一种创新的硝酸盐还原策略，可通过碳底物还原 NO 3 -N。在这项研究中，生物炭作为碳底物在 DNBR 中的应用以及生物炭施用率和生物反应器高度对实验室中硝酸盐和铵浓度的影响进行了研究。使用了 B 0 = 0（对照处理）、B 1 = 10、B 2 = 20 和 B 3 = 30% 的生物炭的四种土壤-生物炭-小麦秸秆含量混合物。此外，为了评估生物反应器高度的影响，使用了 30、60、90 和 120 厘米四个高度。结果表明，对照、B 1 、B 2 和B 3 处理的硝酸盐浓度去除率为74.5%、81%、86.4%和90.6%，生物炭施用率和生物反应器高度对NO 3 -N去除率和生物反应器高度有显着影响。铵浓度。结果还表明NO 3 -N去除和铵浓度随时间增加。生物反应器的出水pH值在实验过程中没有任何特别的趋势。研究了生物炭在 DNBR 中对硝酸盐和铵盐去除的影响。生物炭速率和生物反应器厚度影响硝酸盐和铵的去除。生物炭速率和生物反应器高度对 NO 3 -N 和铵的去除有影响。NO 3 -N 去除和铵浓度随时间增加。出水pH值在实验过程中没有任何特别的趋势。生物炭速率和生物反应器厚度影响硝酸盐和铵的去除。生物炭速率和生物反应器高度对 NO 3 -N 和铵的去除有影响。NO 3 -N 去除和铵浓度随时间增加。出水pH值在实验过程中没有任何特别的趋势。生物炭速率和生物反应器厚度影响硝酸盐和铵的去除。生物炭速率和生物反应器高度对 NO 3 -N 和铵的去除有影响。NO 3 -N 去除和铵浓度随时间增加。出水pH值在实验过程中没有任何特别的趋势。