Removal of ammonium‑nitrogen (NH₄-N), nitrite/nitrate‑nitrogen (summarized as NO_xN) and total nitrogen (TN) was examined in pilot-scale bioretention columns with and without a submerged zone under varied temperature and length of antecedent dry periods. The experiment was divided into wet and dry periods and samples were collected to represent continuously wet conditions and conditions with antecedent dry periods. Removal percentages and main effects of the examined factors as well as the effect of their two-way interactions were evaluated. Generally, low temperature favored NO_x-N and thus TN removal independent of bioretention column design. Interestingly, bioretention columns with a submerged zone achieved the highest nitrogen removal at low temperature (1.5 °C). For standard bioretention columns, outflow concentrations of NO_x-N and TN increased with increasing length of antecedent dry period, whereas a submerged zone mitigated this effect.

在不同温度和长度下，在带有和不带有浸没区的中试规模生物滞留柱中检查了铵-氮 (NH ₄ -N)、亚硝酸盐/硝酸盐-氮（概括为 NO _x N）和总氮 (TN) 的去除情况。前期干旱期。实验分为潮湿期和干燥期，并收集样品以代表连续潮湿的条件和具有前期干燥期的条件。评估了所检查因素的去除百分比和主要影响以及它们的双向相互作用的影响。通常，低温有利于NO _X-N，因此 TN 去除与生物保留柱设计无关。有趣的是，带有浸没区的生物保留柱在低温 (1.5 °C) 下实现了最高的脱氮效果。对于标准生物保留柱，NO _x -N 和 TN 的流出浓度随着前期干燥期长度的增加而增加，而淹没区减轻了这种影响。