Global Journal of Human-Social Science, B: Geography, Environmental Science and Disaster Management, Volume 22 Issue 3

© 2022. Oso, S., Taiwo, A.M., Bamgbose, O., Olayinka, O., Terebo, O., & Soyingbe, A.A. This research/review article is distributed under the terms of the Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0). You must give appropriate credit to authors and reference this article if parts of the article are reproduced in any manner. Applicable licensing terms are at https://creativecommons.org/licenses/by-nc-nd/4.0/. Abatement of Polluting Effects of Waste Dump Leachates using Different Coagulants By Oso, S., Taiwo, A.M., Bamgbose, O., Olayinka, O., Terebo, O. & Soyingbe, A.A. Federal University of Agriculture, Abeokuta Abstract- This study assessed the effectiveness of different coagulants for treating leachates before their release into the environment. Three inorganic coagulants (ferric chloride, ferrous sulphate and alum) and one organic coagulant [Moringer Oleifera seed (MOS)] were used in a jar test to determine the optimum pH and dosage for the coagulants. Raw and treated leachates were analysed for physiochemical parameters such as pH, chemical oxygen demand, Total solids, Pb and Cr. The optimum pH for ferric chloride, ferrous sulphate, alum and MOS was 7, 7,6 and 10 respectively. While the optimum dosage for each coagulant was 3g/L, 3g/L, 5g/L and 5g/L respectively. The analysis of the raw leachate sample showed that it was highly polluted (Dry season: COD – 3000mg/L, TSS – 2369mg/L, Cr – 0.075mg/L, Pb – 0.25mg/L and Mn – 0.29mg/L; Wet season: COD – 3000mg/L, TSS – 2369mg/L, Cr – 0.075mg/L, Pb – 0.25mg/L and Mn – 0.29mg/L). Coagulants removal efficiency (RE) for COD ranges from 12% to 41% with ferric chloride having the highest removal efficiency. Keywords: leachates, coagulants, jar test, removal efficiency, seasonality. GJHSS-B Classification: DDC Code: 616.157 LCC Code: RC647.C55 AbatementofPollutingEffectsofWasteDumpLeachatesusingDifferentCoagulants Strictly as per the compliance and regulations of: Global Journal of HUMAN-SOCIAL SCIENCE: B Geography, Geo-Sciences, Environmental Science & Disaster Management Volume 22 Issue 3 Version 1.0 Year 2022 Type: Double Blind Peer Reviewed International Research Journal Publisher: Global Journals Online ISSN: 2249-460x & Print ISSN: 0975-587X