Chapter 1: Introduction Junidah Lamaming, Pramila Tamunaidu, Abu Zahrim Yaser Chapter 2: Review on environmental impact of improper disposal of agro-industrial effluents Siti Norasyiqin Abdul Latif Chapter 3: Emerging contaminants in agro-industrial effluent: Challenges in water reuse Rinaldy Jose Nathanael and Katharina Oginawati Chapter 4: Harnessing membrane technologies for cleaner agro-industrial effluent management Dayang Norafizan binti Awang Chee, Nur Afiqah binti Kamaludin Mohamed Afizal bin Mohamed Amin, Maya Asyikin Mohamad Arif, Claudeareena Gardling Malien Chapter 5: Utilizing magnetic cellulose aerogel for oil-based spills in agro-industrial effluents Ain Nadirah Romainor, Junidah Lamaming, Saima Sohni Chapter 6: Constructed wetland for agro-industrial wastewater treatment Danar Arifka Rahman and Nurina Fitriani Chapter 7: Sustainable reuse of agro-industrial effluents: Environmental, agricultural, and socioeconomic perspectives Muhammad Abdurrahman Munir Chapter 8: Oil palm by-products as carrier materials in expanded bed process for polishing palm oil mill effluent Wai Loan Liew, Mohd Azraai Kassim, Khalida Muda, Soh Kheang Loh Chapter 9: Nutrient-rich POME as a feedstock for enhanced biogas production: exploring co-digestion techniques Zubaidah Aimi Abdul Hamid, Ahmad Faizal Abdull Razis, Sitti Fatimah Mhd Ramle, Nik Nurul Anis Nik Yusoff, Noor Fazliani Shoparwe Chapter 10: Agro-industrial effluents as a feedstock for bioenergy: A review of current technologies and future prospects S Muthukumaaran Manickam, Wan Abd Al Qadr Imad Wan-Mohtar, Zul Ilham Chapter 11: Microalgae as a sustainable solution for wastewater treatment and resource recovery in agro-industrial sectors Zubair Hashmi, Juliana Zaini, Rosnah Abdullah, Muhammad Saifullah Abu Bakar, Muhammad Roil Bilad Chapter 12: Current status of bioactive compounds from marine microalgae: A sustainable approach for feed and food production using agro-industrial effluents Siti Nur Hazwani Oslan, Hizriana Nuril Fitri Herryady, Fikri Akmal Chapter 13: Optimizing effluent reuse in aquaponics systems: innovations for sustainable agriculture Mohd Aizudin Abd Aziz, Muhammad Auni Hairunnaja1, Nur Amira Fatihah, Khairuddin Md Isa Chapter 14: Utilizing extracted chitosan as eco-friendly agricultural input for sustainable agriculture Muhammad Bukhari Rosly, Nurhamieza Md Huzir, Pramila Tamunaidu, Abd Halim Md Ali, Azlan Nur Rasyid Amin Chapter 15: Exploring in leachate processing technology for sustainable liquid fertilizer production Rizkiy Amaliyah Barakwan Chapter 16: Environmental and economical sustainability of struvite fertilizer Mohamad Darwish and Shaymaa Mustafa Chapter 17: Transforming agro-industrial effluents into biostimulants: Opportunities and applications in a circular economy Nurul Nurhamieza Md Huzir, Pramila Tamunaidu, Abd Halim Md Ali, Muhammad Bukhari Rosly, Azlan Nur Rasyid Amin Chapter 18: Enhancing soil irrigation and plant growth: The role of inorganic nutrients from agro-industrial effluents Maya Asyikin Mohamad Arif & Dayang Norafizan Awang Chee Chapter 19: Energy consumption in aerobic and anaerobic treatment wastewater plants Faranak Faghiri, Habibollah Younesi, Mehri Shabani, Ruggero Rossi Chapter 20: Sustainable prosperity: Exploring the synergy in the blue-green economic model in solving wastewater issue Jain Yassin, Wong Sing Yun, Saizal Pinjaman, Haidy Henry Dusim Chapter 21: Economic benefits of circular wastewater management Wong Sing Yun, Jain Yassin, Cheong Jia Qi, Debbra Toria Nipo, Saizal Pinjaman Chapter 22: Conclusion and Future Perspectives Pramila Tamunaidu, Junidah Lamaming and Abu Zahrim Yaser.