Nitrogen compounds in industrial effluents are considered a serious threat to the environment. The aim of this work is to identify the effect produced by nitrogen-rich wastewater on alkaline soils from industrial land. Two plots were irrigated with wastewater as ammoniacal nitrogen (31 to 53 g N m⁻²) and urea (167–301 g N m⁻²) sources named P1 and P2, respectively. Inorganic nitrogen (N) concentrations (N-NH₃ + N-NH₄, N-NO₂, N-NO₃), soil pH, and N-NH₃ volatilization were monitored during a 2-year period. Variations in the fate of N compounds were distinguished according to the quantity and source of N applied to the soil. A higher N input in the form of urea was related to a greater concentration of nitrates and soil acidification in the topsoil (0–30 cm). Otherwise, ammoniacal N wastewater showed greater relative ammonia losses due to volatilization. Ammonia losses were estimated as 24.2% and 7.43% of the total N applied in P1 and P2, respectively. Besides, in P1 ammoniacal N predominated over nitrate, unlike results obtained in P2. The correct management of nitrogen-rich wastewaters in fertilizer industries could greatly reduce soil and groundwater degradation.

工业废水中的氮化合物被认为是对环境的严重威胁。这项工作的目的是确定富氮废水对工业用地碱性土壤​​产生的影响。两个地块用废水作为氨氮（31 至 53 g N m ^-2）和尿素（167-301 g N m ^-2）源灌溉，分别命名为 P1 和 P2。无机氮 (N) 浓度（N-NH ₃  + N-NH ₄、N-NO ₂、N-NO ₃）、土壤 pH 值和 N-NH ₃在 2 年期间监测挥发。氮化合物归宿的变化根据施入土壤的氮的数量和来源来区分。尿素形式的较高氮输入与较高浓度的硝酸盐和表土（0-30 厘米）中的土壤酸化有关。否则，氨氮废水由于挥发而表现出更大的相对氨损失。氨损失估计分别为 P1 和 P2 中施用的总氮的 24.2% 和 7.43%。此外，与在 P2 中获得的结果不同，在 P1 中，氨氮比硝酸盐占优势。正确管理化肥工业中的富氮废水可以大大减少土壤和地下水的退化。