Biochar, a byproduct obtained from valorization of waste biomass, is utilized in environmental management to restore or improve soil functions where it alters chemical, physical, and biological processes. Therefore, in this study, vastly available oak sawdust was evaluated as a potential feedstock for biochar production with the aim to identify the influence of carbonization conditions on biochar characteristics. Slow pyrolysis with temperatures ranging from 400 to 600 °C and residence times from 15 to 120 min was performed. The feedstock material and resulting biochar were characterized for physical, chemical, and hydraulic properties that are significant for their ability and characteristics as a soil amendment. The pH, BET surface area, carbon content, nutrient content, alkaline functional groups, and water holding capacity increased with increasing pyrolysis temperature and residence time while biochar yield, O/C ratio, and acidic functional groups decreased. Although the effect of holding time on biochar physicochemical properties is less significant than that of temperature, it is an essential parameter to obtain desired biochar properties. It can be concluded that pyrolysis has the potential to add value to regionally available oak sawdust on a sustainable basis and help to restore or improve essential soil functions.

Graphical abstract

生物炭是从废物生物质的增值中获得的副产品，可用于环境管理，以恢复或改善土壤功能，从而改变化学，物理和生物过程。因此，在这项研究中，评估了大量可利用的橡木锯末作为生物炭生产的潜在原料，目的是确定碳化条件对生物炭特性的影响。进行缓慢的热解，温度范围为400至600°C，停留时间为15至120分钟。原料和所得生物炭的物理，化学和水硬特性对其特性和作为土壤改良剂的特性均具有重要意义。pH，BET表面积，碳含量，营养成分，碱性官能团，随着热解温度和停留时间的增加，保水量增加，而生物炭收率，O / C比和酸性官能团降低。尽管保温时间对生物炭物理化学性质的影响不如温度显着，但它是获得所需生物炭性质的重要参数。可以得出的结论是，热解有潜力在可持续的基础上为当地可获得的橡木锯末增加价值，并有助于恢复或改善土壤的基本功能。

图形概要