Hu Min, Cao Xuejuan
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
Sichuan Engineering Research Center of Urban Sludge for Building Materials Resource Utilization, Sichuan College of Architecture &Technology, Deyang 618000, China.
Materials (Basel). 2025 Mar 10;18(6):1225. doi: 10.3390/ma18061225.
Mycelium-based composites (MBCs) have a lot of potential as an alternative lightweight material due to their small environmental footprint and their biodegradability. The unique properties of cellulose-rich sewage sludge (SS) allow it to be used as a substrate for manufacturing MBCs. In order to examine the feasibility of creating MBCs using SS, this study used SS and bagasse as nutrient substrates and cultivated MBCs on ready-made mycelium (). The physico-mechanical properties, morphological properties, and thermal stability of MBCs were tested and analyzed. The results show that both the bagasse and SS promoted fungal growth to create a dense mycelial network on day 10. Adding SS increased the density and compressive strength. The volume shrinkage of the MBCs first decreased and then increased. The optimal ratio of ready-made mycelium-sewage sludge was 2:1. The thermal conductivity of the bagasse-based MBCs was 0.12 WmK and that of the SS-based MBCs was 0.13 WmK. These physico-mechanical characteristics satisfy the requirements of lightweight backfill materials for use in highways. Additionally, the SS supported more robust growth of hyphae and resulted in stronger MBCs. In comparison to bagasse, it also showed better thermal stability and a higher residual mass. It is feasible to produce MBCs with SS, and the biocomposite proposed in this study could be used as a lightweight backfill material of the type that is widely needed for use in highway construction and maintenance.
基于菌丝体的复合材料（MBCs）因其较小的环境足迹和生物可降解性，作为一种替代轻质材料具有很大潜力。富含纤维素的污水污泥（SS）的独特性质使其能够用作制造MBCs的基质。为了检验使用SS制造MBCs的可行性，本研究使用SS和甘蔗渣作为营养基质，并在现成的菌丝体上培养MBCs。对MBCs的物理力学性能、形态学性能和热稳定性进行了测试和分析。结果表明，甘蔗渣和SS均促进了真菌生长，在第10天形成了致密的菌丝网络。添加SS提高了密度和抗压强度。MBCs的体积收缩率先降低后增加。现成菌丝体与污水污泥的最佳比例为2:1。基于甘蔗渣的MBCs的热导率为0.12W/(m·K)，基于SS的MBCs的热导率为0.13W/(m·K)。这些物理力学特性满足公路用轻质回填材料的要求。此外，SS支持菌丝更强劲地生长，从而产生更强的MBCs。与甘蔗渣相比，它还表现出更好的热稳定性和更高的残余质量。用SS生产MBCs是可行的，本研究中提出的生物复合材料可作为公路建设和养护广泛需要的一种轻质回填材料。
