aAzerbaijan University of Architecture and Construction, Ministry of Science and Education, AZ1073 Baku, Azerbaijan

^bAzerbaijan Research Institute of Crop Husbandry, Ministry of Agriculture of the Republic of Azerbaijan, 1010 Baku, Azerbaijan

^cScientific-research institute Geotechnological Problems of oil, gas and chemistry, 1145 Baku, Azerbaijan

^dLandau School, Ministry of Science and Education, 1110 Baku, Azerbaijan

This research explores the potential of using pomegranate peels and chitosan as a natural flocculant for pre-treating wastewater to enhance sand filtration and remove heavy metals (Ni2+, Cu2+, and Zn2+) effectively. Active compounds like tannin are extracted and purified from the pomegranate peels, then chitosan and tannin are modified to create a novel flocculant. The synthesized flocculant is characterized and its performance is evaluated through laboratory experiments, analyzing factors such as dosage, pH, and heavy metal concentration. The results of this work can provide a safe, easy, eco-friendly and cheap method of wastewater treatment.