Institute of Soil Science and Environmental Protection, Wroclaw University of Environmental and Life Sciences, ul. Grunwaldzka 53, 50-357, Wrocław, Poland.
Sci Rep. 2020 Jul 30;10(1):12842. doi: 10.1038/s41598-020-69860-9.
The object of the experiment was to evaluate municipal solid waste (MSW) compost. Composting was carried out in a pile under aerobic conditions. Total content as well as water-extractable forms of macro and microelements were analysed during composting. Nutrient solubility indices were calculated for samples taken at various stages of maturity. The soluble forms of C, P, K, Ca and Mg decreased relatively to their total forms following maturation phases. For all micronutrients tested, a significant reduction in the proportion of soluble forms in relation to their total content was observed with an increase in composting time. In mature compost, low solubility were found for nitrogen, potassium, sodium and magnesium, which may indicate that the final product is a good source of these nutrients. The solubility index (percentage share of water-extractable forms of macro- and micronutrients in the total content) for iron indicates that the composting process does not affect its degree of solubility. Solubility index instead of the content of water-extractable forms of chosen macro- and microelements could be taken into account in determining the degree of MSW compost maturity.
实验目的是评估城市固体废物（MSW）堆肥。堆肥在有氧条件下进行。在堆肥过程中分析了总含量以及宏量和微量元素的水可提取形式。针对不同成熟阶段的样本计算了养分溶解度指数。随着成熟阶段的进行，C、P、K、Ca 和 Mg 的可溶性形式相对于其总量呈下降趋势。对于所有测试的微量元素，随着堆肥时间的增加，可溶性形式的比例相对于其总量显著减少。在成熟堆肥中，氮、钾、钠和镁的溶解度较低，这可能表明最终产品是这些养分的良好来源。铁的溶解度指数（总含量中宏量和微量元素的水可提取形式的百分比份额）表明堆肥过程不会影响其溶解度。在确定 MSW 堆肥成熟度时，可以考虑选择的宏量和微量元素的水可提取形式的溶解度指数，而不是其含量。
