Human civilization has long grappled with the paradox of progress, while technological advancementsTechnological advancements drive economic growth and societal development; they also generate vast amounts of waste, threatening ecological balance and sustainabilitySustainability. The unchecked accumulation of industrialIndustrial, domestic, and hazardous waste has disrupted natural cycles, posing challenges that demand urgent, innovative solutions. Traditional waste managementWaste management practices, such as incineration and landfilling, often address symptoms rather than root causes, leading to persistent environmental degradationDegradation. In response, biotechnologyBiotechnology has emerged as a transformative force, offering sustainable and efficient alternatives for waste disposal and bioenergyBioenergy generationBioenergy generation. This chapter explores the integration of biotechnological solutions for waste management, focusing on microbialMicrobial bioremediationMicrobial bioremediation, anaerobic digestionAnaerobic digestion, and mixed culture biotechnologyBiotechnology (MCB). Advanced microbial consortia enable the conversion of organic wasteOrganic waste into biofuelsBiofuels such as biogas, biohydrogen, and bioethanol, while engineered microorganisms like Deinococcus radiodurans and Thauera aromatica demonstrate remarkable capabilities in detoxifying nuclear and petroleum waste, respectively. The chapter also highlights the potential of polyhydroxyalkanoates (PHAs) as biodegradableBiodegradable plastic alternatives, along with the role of microbialMicrobial fuel cells (MFCs) in waste-to-energyWaste-to-energy conversion. By embracing biotechnological innovations, humanity has an opportunity to redefine its relationship with waste - not as an inevitable burden, but as a resource for regeneration. This chapter provides a comprehensive review of cutting-edge biological strategies that align with circular economyCircular economy principles, fostering sustainable waste managementWaste management and alternative bioenergyBioenergy production. As we stand at the crossroads of environmental crisis and scientific opportunity, biotechnologyBiotechnology paves the way for a future where waste is no longer a byproduct of progress, but a catalyst for sustainabilitySustainability.