Abstract A relatively wide denitrifying woodchip bioreactor (LWD: 16.8 × 10.7 × 0.91 m) was installed with two flow-routing baffles in Illinois, USA with the design objectives of minimizing inflow manifold-related flow restrictions while maintaining both a relatively consistent footprint and nitrate-removal performance compared to conventional designs. This wide design did not improve the percentage of flow from the field that was treated (generally about 40% of flow treated) compared to other sites. However, the Richards-Baker flashiness index (0.74 to 0.91) and probability of exceedance evaluations indicated site drainage was flashy which might have accounted for the lower than expected performance. Nitrate removal was consistent with other bioreactors despite the new design ideas (22–24% edge of field N loss reduction; 0.72 to 1.3 g N removed m−3 d−1). Within the context of the need for accelerated conservation drainage practice adoption across the US Midwest, trying to account for flow uncertainties like flashiness with site-specific designs could be a bottleneck for bioreactor design and implementation. It may be worthwhile to explore possible benefits of a simpler design approach (e.g. standardized plug-and-play designs) since there are many factors at play in bioreactor performance.

中文翻译：

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带挡板的宽反硝化生物反应器的设计流程和硝酸盐去除评价

摘要 一个相对宽的反硝化木片生物反应器（LWD：16.8 × 10.7 × 0.91 m）在美国伊利诺伊州安装了两个流路挡板，其设计目标是最大限度地减少流入歧管相关的流量限制，同时保持相对一致的足迹和硝酸盐- 与传统设计相比的去除性能。与其他场地相比，这种宽阔的设计并没有提高来自已处理场地的流量百分比（通常约为已处理流量的 40%）。然而，Richards-Baker 闪光指数（0.74 至 0.91）和超标概率评估表明场地排水闪光，这可能是低于预期的性能的原因。尽管采用了新的设计理念（22-24% 的田间氮损失减少；0.72 比 1. 3 g N 移除 m-3 d-1)。在需要在美国中西部加速采用保护性排水实践的背景下，试图用特定地点的设计来解决流动的不确定性，如闪光可能是生物反应器设计和实施的瓶颈。探索更简单的设计方法（例如标准化的即插即用设计）可能带来的好处可能是值得的，因为在生物反应器性能方面有许多因素在起作用。