International Science Community Association Research Journal of Engineering Sciences 14 1 2025 01 26 Valorization of powder of neem hulls like bioadsorbant for the detoxification of the hospital effluents: Case of CNHU-HKM 16 21 EN Shah Hetal 1 Department of Electronics Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India Chauhan Narendrakumar 2 Department of Electronics Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India Jhala Vageshri 3 Department of Electronics Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India Sharma Parul 4 Department of Electronics Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India B. Parmar Avinash kumar 1 Department of Instrumentation and Control Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India V. Desai Devansh 2 Department of Instrumentation and Control Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India V. Chawda Jaymin 3 Department of Instrumentation and Control Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India Shah Vipul A. 4 Department of Instrumentation and Control Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India Patel Himanshu 5 Department of Instrumentation and Control Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad, Gujarat, India Vora Nirav 1 Department of Mechanical Engineering, Dharmsinh Desai University, Nadiad-387001, Gujarat, India Bassan Gurmitsingh 2 Department of Mechanical Engineering, Dharmsinh Desai University, Nadiad-387001, Gujarat, India CAKPO Arthur Romuald 1 Laboratoire de Chimie Physique-Matériaux et Modélisation Moléculaire (LCP3M), Unité de recherche de Chimie Inorganique, Ingénierie des Matériaux et Environnement (URCIIME) - Faculté des Sciences et Techniques (FAST), République du Bénin Mireille FANOUVI 2 Centre Inter facultaire de Formation et de Recherche en Environnement pour le Développement Durable (CIFRED), Université d’Abomey - Calavi (UAC), République du Bénin Hervé BOKOSSA 3 Centre Inter facultaire de Formation et de Recherche en Environnement pour le Développement Durable (CIFRED), Université d’Abomey - Calavi (UAC), République du Bénin Etienne SAGBO 4 Laboratoire de Chimie Physique-Matériaux et Modélisation Moléculaire (LCP3M), Unité de recherche de Chimie Inorganique, Ingénierie des Matériaux et Environnement (URCIIME) - Faculté des Sciences et Techniques (FAST), République du Bénin > Research Article 2024 9 3 2025 01 26 The chemical subtances used in hospitals for various treatments are often found in hospital liquid effluents. This discharge of these liquid effluents into the natural environment is an enormous risk for human health. It can cause a real problem in our environment with harmful and sometimes irreversible consequences on the aquatic ecosystem. The objective of this Master’s thesis is to evaluate the chemical pollution of liquid effluents from the National Hospital and University Center Hubert KOUTOUKOU MAGA (CNHU-HKM) of Cotonou by the cytotoxicity test based on the inhibition of the growth of the roots of onions cultivated. These effluents were subject to decontamination with neem husk powder and its activated carbon. The cytotoxicity test carried out on samples of untreated CNHU-HKM Hospital effluent shows that the Effective Concentration for which chemical effects are observed for 50% of the effluents tested (EC50) is 22%. Depollution whith hull powder of neem (BA) gave 27% and that obtained with is Activated Carbon (AC) gave 37%. The results obtained reveal that the effluents from the CNHU-HKM are chemically polluted, that is to say, do not comply with the standards in force in Benin. These clearly show that it is important to carry out regular monitoring and evaluation of our hospital effluents before their discharge into urban sanitation networks. Copyright@ International Science Community Association