Department of Chemical Engineering and Environmental Technology, Valladolid University, Doctor Mergelina, s/n, 47011 Valladolid, Spain.
J Environ Manage. 2010 Dec;91(12):2594-8. doi: 10.1016/j.jenvman.2010.07.020. Epub 2010 Aug 12.
The effect of physical-chemical slurry treatment on the mobility and transformation of nitrogen and organic matter from pig slurry after soil application is evaluated. Two different pig slurries (one treated by stripping with air at pH=9 and another non-treated) were applied at the top of a soil column, containing approximately 100 kg of soil. Effluents were monitored measuring concentration values of ammonia, nitrites, nitrates and total organic carbon (TOC). The breakthrough curves were modelled using STANMOD and HYDRUS 1D codes. Low concentrations of ammonia were detected in the effluent recovered at the bottom of the soil profile for both types of slurry. Nitrate concentration in effluent was lower and more homogenous over time when applying stripping treated pig slurry. In N modelling, adsorption of ammonia by soil proved an important process, nitrite and nitrate adsorption being less significant, although not negligible. Transformation from ammonia to nitrite controls the kinetics of the nitrification process. Total organic carbon in the column effluent was higher in the experiment using treated pig slurry, which can be attributed to organic matter solubilisation in the stripping treatment process.
评估了物理化学浆处理对猪粪施入土壤后氮素和有机质迁移转化的影响。在土壤柱的顶部施加了两种不同的猪粪（一种用空气在 pH=9 下进行汽提处理，另一种未处理），土壤中大约含有 100 公斤。通过测量氨、亚硝酸盐、硝酸盐和总有机碳（TOC）的浓度值来监测流出物。使用 STANMOD 和 HYDRUS 1D 代码对穿透曲线进行建模。对于两种类型的浆，在土壤剖面底部回收的流出物中都检测到了低浓度的氨。当施加汽提处理的猪粪时，流出物中的硝酸盐浓度随时间的推移更低且更均匀。在氮素模型中，土壤对氨的吸附被证明是一个重要的过程，亚硝酸盐和硝酸盐的吸附虽然不显著，但也不容忽视。氨向亚硝酸盐的转化控制着硝化过程的动力学。在使用处理后的猪粪的实验中，柱流出物中的总有机碳更高，这可能归因于汽提处理过程中有机质的溶解。
