Department of Zoology and Animal Welfare, University of Agriculture in Cracow, Cracow, Poland.
Department of Agricultural and Environmental Chemistry, University of Agriculture in Cracow, Cracow, Poland.
Sci Rep. 2022 Feb 16;12(1):2592. doi: 10.1038/s41598-022-06569-x.
Spent coffee grounds (SCG) as well as chicken (CES) or duck eggshells (DES) left over from the artificial hatching technology are proposed as potential soil improver and/or organic-mineral fertiliser components. Therefore, it seems interesting and necessary to evaluate the chemical composition of these wastes and their mixtures in terms of their possible use for that purpose. The study was conducted under the incubation experiment conditions using a mixture of SCG and eggshells (10:1 ratio). Macronutrients, i.e. C, N, S, were determined by the catalytic combustion method, while P, K, Mg, Ca, Na by atomic spectrometry. It was found that SCG were rich in C, N, P, and K, while eggshells in Ca, Mg, Na, and S. However, CES compared to DES were richer in deacidifying components (i.e. Ca, Mg, K). At the same time, the content of macronutrients in eggshells decreased gradually along with the embryo development. For this reason, the mixture of SCG and shells of unembryonated chicken eggs (CES I) had the best chemical and usable proprieties. To conclude, the chemical properties of the mixtures of spent coffee grounds and eggshells indicate their possible application in soil bioengineering.
废弃的咖啡渣（SCG）以及用于人工孵化技术的鸡（CES）或鸭蛋壳（DES）被提议作为潜在的土壤改良剂和/或有机-矿物肥料成分。因此，评估这些废物及其混合物的化学成分，以确定其在该用途方面的可能用途，似乎是有趣且必要的。本研究在孵化实验条件下进行，使用 SCG 和蛋壳的混合物（10:1 比例）。通过催化燃烧法测定 C、N、S 等大量营养素，通过原子光谱法测定 P、K、Mg、Ca、Na。结果表明，SCG 富含 C、N、P 和 K，而蛋壳富含 Ca、Mg、Na 和 S。然而，与 DES 相比，CES 富含脱酸成分（即 Ca、Mg、K）。同时，蛋壳中的大量营养素含量随着胚胎发育逐渐减少。因此，废弃咖啡渣和未受精鸡蛋壳（CES I）的混合物具有最佳的化学和可利用特性。总之，废弃咖啡渣和蛋壳混合物的化学性质表明它们可能应用于土壤生物工程。
