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Denitrification behavior in a woodchip-packed bioreactor with gradient filling for nitrate-contaminated water treatment
Biochemical Engineering Journal ( IF 3.9 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.bej.2019.107454
Jiamin Zhao , Qiaochong He , Nan Chen , Tong Peng , Chuanping Feng

Abstract Woodchip solid-phase denitrification bioreactors (SPDRs) are widely applied to remove NO3− from water. In this study, two SPDRs with different woodchip filling patterns, namely a gradient filling bioreactor (G-SPDR) and a uniform filling bioreactor (U-SPDR), were constructed and their denitrification performances were investigated. Analysis of the NO3− removal pathway along the water flow path showed that NO3− removal rates could be enhanced using the G-SPDR (35.66–174.55 mg N·L−1·d−1) compared to the U-SPDR (25.17–111.72 mg N·L−1·d−1) at an appropriate flow rate (0.3–1.8 mL·min−1). In addition, the G-SPDR promoted complete denitrification with low NO2− accumulation. Chamber model analysis showed that the maximum NO3− removal rate was closer to the inlet in the G-SPDR. Furthermore, the optimum reaction height was 25 cm for the G-SPDR and 35 cm for the U-SPDR, implying that gradient filling could reduce the size of the bioreactor. Therefore, gradient filling is a promising and cost-saving method to construct SPDRs for the bioremediation of NO3− contaminated water.

中文翻译:

用于硝酸盐污染水处理的梯度填充木屑生物反应器中的反硝化行为

摘要 木片固相反硝化生物反应器(SPDR)被广泛应用于去除水中的 NO3−。在这项研究中,构建了两种具有不同木片填充模式的 SPDR,即梯度填充生物反应器 (G-SPDR) 和均匀填充生物反应器 (U-SPDR),并研究了它们的反硝化性能。沿水流路径的 NO3− 去除路径分析表明,与 U-SPDR (25.17–1) 相比,使用 G-SPDR (35.66–174.55 mg N·L–1•d–1) 可以提高 NO3– 去除率111.72 mg N·L-1·d-1) 在适当的流速 (0.3–1.8 mL·min-1) 下。此外,G-SPDR 促进了低 NO2− 积累的完全反硝化。腔室模型分析表明,最大 NO3− 去除率更接近 G-SPDR 的入口。此外,G-SPDR 的最佳反应高度为 25 cm,U-SPDR 为 35 cm,这意味着梯度填充可以减小生物反应器的尺寸。因此,梯度填充是构建用于 NO3− 污染水生物修复的 SPDR 的一种有前景且节省成本的方法。
更新日期:2020-02-01
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