1. Bioreactors for Biomass Conversion– Solid-State Fermentation, Slurry Reactors, Airlift Reactors Aayush Kumar Choudhary, Ayush Kumar A., Ojshwi Prakash, Godwin Glivin, N. Kalaiselvan, H. Hareesh Krishnan, M. Premalatha, V. Mariappan, and Joseph Sekhar 2. Immobilised Enzyme Technologies for the Removal of Water Pollutants and Toxic Contaminants Nur Izyan Wan Azelee, Nor Hasmaliana Abdul Manas, Nurrulhidayah Salamun, Mohd Akmali Mokhter, Muhammad Abd Hadi Bunyamin, Nurul Elia Aqila Abu Rahim, Siti Fatimah Zaharah Mohd Fuzi, and Nasratun Masngut 3. Value-Added Products from Microalgae A. Ayush Kumar, Vinodini Elango, Aayush Kumar Choudhary, Ojshwi Prakash, M. Premalatha, V. Mariappan, Godwin Glivin, N. Kalaiselvan, and Joseph Sekhar Santhappan 4. Cleanup of Marine Oil Spills through Bioremediation Method Farah Shahirah Mohd Fairuz, Nur Fatien Muhamad Salleh, Nurasmat Mohd Shukri, Muhammad Hilman Abdul Mustapa, Wan Nur Aini Wan Mokhtar, and Nur Afiqah Badli 5. Bioreactor Scale-Up Strategies Aayush Kumar Choudhary, A. Ayush Kumar, Ojshwi Prakash, Godwin Glivin, N. Kalaiselvan, H. Hareesh Krishnan, Premalatha M, V. Mariappan, and Joseph Sekhar 6. Biotechnological Advancements in the Treatment of Plastic Wastes Daniel Joe Dailin, Luo Zaini Mohd Izwan Low, Nurul Zahidah Nordin, Nur Izyan Wan Azelee, Shanmugaprakasham Selvamani, Vasantha M. Nayagam, Dayang Norulfairuz Abang Zaidel, and Hesham Ali El Enshasy 7. Production of Biopolymer from Waste Materials as the Suitable Alternative for Plastics Rohaida Che Man, Nur Nadia Binti Mohd Zakaria, and Nurul Nabila Huda Baharudin 8. Microbial Pigments Production Using Agricultural Biomass Residues Ganesh Babu Malli Mohan and Sam Aldrin Chandran 9. Nanotechnology-Associated Bioremediation for the Elimination of Emerging Contaminants Alok Tripathi, Sheeba Narayanan, and P. Suresh Kumar 10. Phytoremediation Potential of Some Bioenergy Crops– A Review V. Anbuganesan, R. Vishnupradeep, A. S. Archana, S. Soundarya, L. Benedict Bruno, and M. Rajkumar 11. Sustainable Approach for the Extraction of Precious Metals from Electronic Waste Materials Alaa El Din Mahmoud 12. Conversion of Organic Waste to Economically Valuable Products: Recent Advancements with Challenges Shamim Mia, Md. Mehedi Hasan Mithu, Sanjida Aktar, Ayesa Akter Suhi, Ashim Sikdar, Miguel Angel Sanchez-Monedero, and Tomoyuki Makino