Ayash, Muneer M. A.Alkarkhi, Abbas F. M.Abu Amr, Salem S.Mahmud, M. N.Zulkifli, Muzafar2024-09-292024-09-2920221944-39941944-3986https://doi.org/10.5004/dwt.2022.28378https://hdl.handle.net/20.500.14619/7672In this research, the performances of modified tannin and aluminium sulfate (alum) for stabilized leachate treatment were investigated and compared using coagulant dosage, pH, and rapid mixing speed as the input variables. Four different responses were used to compare the treatment performances; the responses are, chemical oxygen demand (COD), color, ammoniacal nitrogen (NH3??? N) and total suspended solids (TSS). The results of the analysis for 36 experiments showed that the optimum operating conditions for 1% modified tannin and 10% alum are a coagulant dosage of 6 mL, a pH of 9 and a rapid mixing speed of 100 rpm. The optimum removal efficiencies of COD, color, NH3???N and TSS using 1% modified tannin were 42.86%, 54.38%, 39.39% and 60.33% respectively, and using 10% alum were 60.71%, 63.09%, 42.42% and 60.33%, respectively. The findings revealed that the effectiveness of modified tannin for the treatment of landfill leachate was significant using a ten-time lower dosage concentration than alum. This study will help better understanding the behaviour of organic and inorganic coagulants for wastewater treatments using the same polynomial model.eninfo:eu-repo/semantics/closedAccessTanninAlumCoagulationFace-centered designPolynomial modelRemovalArticle10.5004/dwt.2022.283782-s2.0-85130794894138Q3125256WOS:000806939400011Q4