Water environment safety is the focus of engineering measures to eliminate liquid digestate in farmland. It is of great significance to study the aging characteristics of soil absorbing and fate of liquid digestate ammonium nitrogen (NH₄⁺-N) to realize safe and efficient disposal. In this paper, simulation experiments of digesting NH₄⁺-N (with application of 0, 120, 180, and 300 kg/hm²) by static soil column are carried out to study disposal efficiency, migration and transformation characteristics, and fate proportion of NH₄⁺-N in saturated water content soil. The result showed that after 3 days of application, the overlying water NH₄⁺-N concentration decreased by 63.5–80.7%, and the reduction rate of total NH₄⁺-N was 65.8–82.3%. After 4 days, the NH₄⁺-N concentration of pore water in the 0–10 cm soil layer reached the peak value. After 7 days, the NH₄⁺-N concentration adsorbed by the 0–10 cm soil layer reached the peak value. After 15 days, the overlying water NH₄⁺-N concentration decreased by 97.0–98.7%, the reduction rate was 97.9–99.2%, and the proportion of NH₄⁺-N absorbed in the 0–10 cm soil layer accounted for 63.5–76.3%. The disposal is mainly based on soil sorption and pore water migration. A duration of 0–3 days is the rapid disposal period, and 15 days is the completion period of safe digestion.

中文翻译：

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农田土壤液态消化铵态氮处理的老化特征及归宿分析

水环境安全是农田沼渣消解工程措施的重点。_{研究液体消化液铵态氮(NH 4} ⁺ -N)的土壤吸收老化特性及去向对于实现安全高效处置具有重要意义。本文通过静态土柱消化NH ₄ ⁺ -N（施用0、120、180、300 kg/hm ²）的模拟实验，研究处理效率、迁移转化特性和归宿比例。饱和含水量土壤中NH ₄ ^{+ -N的影响。}结果表明，施用3天后，上覆水NH ₄ ⁺-N浓度降低了63.5-80.7%，总NH ₄ ⁺ -N的降低率为65.8-82.3%。4天后，0~10 cm土层孔隙水NH ₄ ^{+ -N浓度达到峰值。}7天后，0~10 cm土层吸附的NH ₄ ^{+ -N浓度达到峰值。}15 d后上覆水NH ₄ ⁺ -N浓度下降97.0~98.7%，下降率97.9~99.2%，NH ₄ ⁺0~10 cm土层吸收的-N占63.5~76.3%。处置主要基于土壤吸附和孔隙水迁移。0-3天为快速处置期，15天为安全消化完成期。