Wystalska Katarzyna, Malińska Krystyna, Sobik-Szołtysek Jolanta, Dróżdż Danuta, Meers Erik
Faculty of Infrastructure and Environment, Czestochowa University of Technology, Brzeźnicka 60A, 42-200 Częstochowa, Poland.
Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
Materials (Basel). 2023 Sep 25;16(19):6392. doi: 10.3390/ma16196392.
Peat is considered a contentious input in horticulture. Therefore, there is a search for suitable alternatives with similar properties that can be used for partial or complete peat substitution in growing media. Poultry-manure-derived biochar (PMB) is considered such an alternative. This study aimed at determining the properties of PMBs obtained through pyrolysis at selected temperatures and assessing their potentials to substitute peat in growing media based on the selected properties. The scope included the laboratory-scale pyrolysis of poultry manure at the temperatures of 425-725 °C; the determination of selected physico-chemical and physical properties of the obtained biochars, including the contaminants; and the assessment of the potentials of produced biochars to be used as peat substitutes. PMBs contained less than 36% of total organic carbon (TOC). The contents of P and K were about 2.03-3.91% and 2.74-5.13%, respectively. PMBs did not retain N. They can be safely used as the concentrations of heavy metals, polycyclic aromatic hydrocarbons (PAHs), polychlorinatd biphenyls (PCBs), dioxins, and furans are within the permissible values (except for Cr). Due to high pH (9.24-12.35), they can have a liming effect. High water holding capacity (WHC) in the range of 158-232% could allow for the maintenance of moisture in the growing media. PMBs obtained at 525 °C, 625 °C, and 725 °C showed required stability (H/C < 0.7).
泥炭在园艺领域被视为一种有争议的投入物。因此，人们正在寻找具有相似特性的合适替代品，以便在种植介质中部分或完全替代泥炭。源自家禽粪便的生物炭（PMB）被认为是这样一种替代品。本研究旨在确定通过在选定温度下热解获得的PMB的特性，并根据选定特性评估其在种植介质中替代泥炭的潜力。研究范围包括在425 - 725°C温度下对家禽粪便进行实验室规模的热解；测定所得生物炭的选定物理化学和物理性质，包括污染物；以及评估所生产生物炭作为泥炭替代品的潜力。PMB的总有机碳（TOC）含量低于36%。磷和钾的含量分别约为2.03 - 3.91%和2.74 - 5.13%。PMB不保留氮。由于重金属、多环芳烃（PAH）、多氯联苯（PCB）、二恶英和呋喃的浓度在允许值范围内（除铬外），它们可以安全使用。由于pH值较高（9.24 - 12.35），它们可能具有调酸作用。158 - 232%范围内的高持水能力（WHC）可以使种植介质保持水分。在525°C、625°C和725°C下获得的PMB表现出所需的稳定性（H/C < 0.7）。
