Sica P, Kopp C, Müller-Stöver D S, Magid J
University of Copenhagen, Department of Plant and Environmental Sciences, Thorvaldsensvej, 40, 1821, Frederiksberg, Denmark.
University of Copenhagen, Department of Plant and Environmental Sciences, Thorvaldsensvej, 40, 1821, Frederiksberg, Denmark.
J Environ Manage. 2023 May 1;333:117447. doi: 10.1016/j.jenvman.2023.117447. Epub 2023 Feb 8.
Sustainability concerns as well as recent increases in fertilizer prices exacerbates the need to optimise the use of biowastes as fertilizers. For this reason, we investigated how different pretreatments affect the P dynamics when biofertilizers are placed in the soil.
Sewage sludge (SS), sewage sludge ash (SS-ash), meat and bone meal (MBM), and the solid fraction of biogas digestate (BGF) were pretreated with HSO, NaOH, and Ca(OH) and incubated for 2 and 12 days, respectively, in a one-dimensional reaction system for detailed studies of the interactions in the biomaterial-soil interface and the soil adjacent to the placement zone.
Our results showed that acidification and treatment with NaOH increased the P solubility of the biomaterials. The P loss from the biomaterial layer to the soil was correlated with water-extractable P in the biomaterials (0.659) and water-extractable P in the soil (0.809). Acidification significantly increased the total amount of P depleted from the biomaterial to the soil whereas NaOH pre-treatment did not. However, for NaOH-treated SS and SS-ash, the apparent recoveries were significantly higher compared to the acidification due to a decrease in soil P sorption capacity as the soil pH increased due to residual alkalinity in the biomaterials.
Acidification showed promising results by increasing the P solubility of all the biomaterials, and the alkalinization of SS and SS-ash with NaOH by increasing the apparent recovery in the soil. However, further studies are needed to assess the effects of these treatments on plant growth and P uptake.
可持续发展问题以及近期化肥价格上涨加剧了优化生物废弃物作为肥料使用的需求。因此，我们研究了不同预处理如何影响生物肥料施入土壤时的磷动态。
污水污泥（SS）、污水污泥灰（SS-ash）、肉骨粉（MBM）和沼渣固体部分（BGF）分别用HSO、NaOH和Ca(OH)进行预处理，并在一维反应系统中分别培养2天和12天，以详细研究生物材料-土壤界面及放置区附近土壤中的相互作用。
我们的结果表明，酸化和用NaOH处理可提高生物材料的磷溶解度。生物材料层向土壤的磷损失与生物材料中的水溶性磷（0.659）和土壤中的水溶性磷（0.809）相关。酸化显著增加了从生物材料中消耗到土壤中的磷总量，而NaOH预处理则没有。然而，对于用NaOH处理的SS和SS-ash，由于生物材料中的残余碱度使土壤pH值升高，土壤磷吸附能力降低，其表观回收率相比酸化显著更高。
酸化通过提高所有生物材料的磷溶解度显示出良好的效果，而用NaOH对SS和SS-ash进行碱化处理则通过提高土壤中的表观回收率显示出良好效果。然而，需要进一步研究来评估这些处理对植物生长和磷吸收的影响。
