Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Denmark.
Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Denmark; EnergyLab Technology Centre, Department of Bioenergy, Spain.
Waste Manag. 2023 Jul 1;166:86-95. doi: 10.1016/j.wasman.2023.04.050. Epub 2023 May 9.
Bioacidification of animal slurry has proven to be a good alternative to traditional acidification with sulfuric acid for reducing ammonia emissions. However, the fertiliser value of the bioacidified slurry is yet to be determined before a whole-system assessment can be made. The N fertiliser value of pig slurry either untreated or bioacidified with glucose and/or fermented brown juice (BJ) was investigated in a pot experiment with maize (Zea mays L.) grown in a greenhouse. The slurry treatments were either pre-acidified with sulfuric acid to pH 6.5 or 5.5 before bioacidification, or bioacidified without pre-acidification. Plant growth was good in all treatments, but the bioacidified treatments showed a lower mineral fertiliser equivalence (MFE) value than the non-bioacidified treatments. Average MFE values were 71 %, 62 %, 59 % and 41 % for the non-bioacidified (noC), glucose (glu), glucose and brown juice (glu + BJ20) and brown juice (BJ50) treatments respectively. This reduction was most likely caused by immobilisation of N due to the addition of easily available C from the substrates. The fertiliser value was not affected by the pH, C/N ratio and C content of the treatments, while a positive correlation was found with NH4 + -N content. Pre-acidification positively affected MFE, probably due to higher nutrient availability. Further studies on the effect of different inclusion rates of substrates for bioacidification and the effect of application method on the fertiliser value, as well as studies under field conditions, are needed before recommendations can be made about bioacidification as an alternative to traditional acidification.
动物粪便的生物酸化已被证明是一种替代传统硫酸酸化以减少氨气排放的好方法。然而，在进行全面系统评估之前，还需要确定生物酸化粪便的肥料价值。在温室中种植玉米（Zea mays L.）的盆栽实验中，研究了未经处理或用葡萄糖和/或发酵棕浆（BJ）生物酸化的猪粪的氮肥料价值。在生物酸化之前，将粪便处理分别用硫酸预酸化至 pH 6.5 或 5.5，或不进行预酸化而直接生物酸化。所有处理中的植物生长都很好，但生物酸化处理的矿质肥料当量（MFE）值低于非生物酸化处理。非生物酸化（noC）、葡萄糖（glu）、葡萄糖和棕浆（glu + BJ20）和棕浆（BJ50）处理的平均 MFE 值分别为 71%、62%、59%和 41%。这种减少很可能是由于添加了易于利用的底物中的 C，导致 N 的固定。肥料价值不受处理的 pH、C/N 比和 C 含量的影响，而与 NH4 + -N 含量呈正相关。预酸化对 MFE 有积极影响，可能是由于养分的可用性更高。在推荐生物酸化作为传统酸化的替代方法之前，还需要进一步研究生物酸化中不同底物添加率的影响以及应用方法对肥料价值的影响，并在田间条件下进行研究。
