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Effect of functional membrane covering on the transformation of organic components and heavy metal forms in aquatic waste composting
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AI
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Y. Q. WangX
Xu QiX
Xiaojing XieG
Guangcheng XiongX
Xi LuoR
Rui Cai* DOI：10.1016/j.bej.2026.110180.png)
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Abstract
En 中文
Aquatic waste, due to high volumes and environmental risks, have drawn attention from scholars and regulators. Functional membrane-covered aerobic composting can convert aquatic waste into nutrient-rich organic amendments, yet knowledge gaps persist regarding organic matter transformation, heavy metal speciation, and microbial functional responses during aquatic waste composting. This study investigated the effects of functional membrane covering (FM) on fermentation efficiency, organic matter degradation, and heavy metal speciation during aquatic waste composting. The Results shown that compared with the control group (CK), FM enhanced the degradation rate of organic matter by 12.6%, elevated the peak composting temperature by more than 4 degrees C, and increased germination index by 12%. These improvements are mechanistically linked to FM-mediated changes in microbial community structure and function. Specifically, FM increased the abundance of Flavobacterium, Planifilum, Luteimonas and Thermobifidas, and improved the microbial community's capacity for carbohydrate, amino acid, and energy metabolism. Furthermore, FM could indirectly influence heavy metal speciation by regulating key physicochemical parameters (e.g., organic components, electrical conductivity, and maturity) and reshaping the microbial community. Consequently, this process facilitates the formation of residual heavy metals and leads to a significant reduction in the exchangeable fractions of Cr, As, Cu, and Pb (p < 0.05). These research findings will provide scientific support for the resource-based utilization and harmless transformation of aquatic waste.
Keywords:
Functional membrane
Aquatic waste composting
Organic component transformation
Heavy metal forms
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