Institute of Earth and Environmental Sciences, Faculty of Earth Sciences and Spatial Management, Maria Curie-Skłodowska University, Al. Kraśnicka 2cd, 20-718, Lublin, Poland.
Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, Pl. Marii Curie-Skłodowskiej 3, 20-031, Lublin, Poland.
Chemosphere. 2021 Sep;278:130447. doi: 10.1016/j.chemosphere.2021.130447. Epub 2021 Apr 5.
Due to environmental concern, direct utilization of sewage sludge or residues from biogas production is restricted. Conversion of problematic bio-wastes into biochars can be a very effective solution. In the presented study, the adsorption of fulvic acids onto series of biochars produced from bio-wastes such as sewage sludge, residues from biogas production, and plant (Miscanthus sp.) were performed to examine the behavior of biochars in the environment and interactions with fulvic acids as the representatives of dissolved organic matter. The results clearly indicate that the highest excess of fulvic acids, 93-96 mg g, was chemisorbed onto biochar obtained specifically from sewage sludge. The mechanism of the adsorption was independent from applied biochar feedstock. Monolayer coverage was dominant onto all biochars. Generally, adsorption was assumed to be controlled by polar interactions between fulvic acids and the biochars or pre-adsorbed and residual fulvic acids molecules (which were dominant) and the strong π-π interactions. The obtained high values of the adsorption capacity of sewage sludge derived biochars confirmed that thermal treatment is a very effective tool of bio-waste management.
由于环境方面的考虑，直接利用污水污泥或沼气生产的残渣受到限制。将有问题的生物废物转化为生物炭是一种非常有效的解决方案。在本研究中，对一系列生物炭进行了腐殖酸吸附实验，这些生物炭是由生物废物（如污水污泥、沼气生产残渣和植物（芒属））制成的，以研究生物炭在环境中的行为以及与腐殖酸（代表溶解有机物）的相互作用。结果清楚地表明，腐殖酸的最大过剩量（93-96mg/g）被化学吸附到专门从污水污泥中获得的生物炭上。吸附的机制与所使用的生物炭原料无关。单层覆盖在所有生物炭上均占主导地位。一般来说，吸附被假定是由腐殖酸和生物炭之间的极性相互作用或预吸附和残留腐殖酸分子（占主导地位）以及强π-π相互作用控制的。从污水污泥衍生的生物炭获得的高吸附容量值证实了热解处理是一种非常有效的生物废物管理工具。
