The robust transition toward a sustainable, circular bioeconomy relies extensively on deploying advanced environmental biotechnology to manage recalcitrant organic and pharmaceutical wastes. Traditional treatment paradigms are frequently inefficient at preventing the environmental proliferation of antimicrobial resistance genes (ARGs) or lack the metabolic precision to optimally convert complex lignocellulosic biomass into high-value platform chemicals and volatile fatty acids. Consequently, establishing highly reproducible, standardized microbial and biochemical protocols is urgently required.

This Topical Collection aims to aggregate visually documented, cutting-edge experimental frameworks focusing on the microbial valorization and bioremediation of complex waste streams. The collection highlights innovative methodologies, encompassing the strategic application of white-rot fungi for low-energy lignocellulose pretreatment, the physical synthesis of novel biochar composites for stable fungal immobilization, and the precise regulation of anaerobic co-digestion systems for pharmaceutical residue detoxification.

By offering step-by-step visual guidance on multifaceted procedures—such as multi-omics monitoring of bacterial community succession, bioreactor parameter optimization under extreme pH, and enzyme-driven biodegradation pathway elucidation—this collection equips environmental engineers, toxicologists, and applied microbiologists with the essential tools needed to accelerate the leap from lab-scale discoveries to industrial-scale ecological remediation.