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

III. R esults and D iscussion a) Characteristics of Landfill Leacahte The results of the physiochemical analysis of the untreated leachate samples from the dumpsite during dry and wet seasons are presented in Table 1. The Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total Dissolved Solid (TDS), Chloride, Chromium, Lead and Manganese of the untreated leachate samples from the dumpsites exceeded the limiting values recommended by the WHO and the FMENV. The values of all other parameters were within the allowable limits as specified. The high level of Pb and Mn is due to the dumping of metals such as cans, used batteries, iron etc in the dumpsite. Table 1: Characteristic of raw leachate sample for wet and dry seasons Parameters Dry (mg/L) Wet (mg/L) T value *pH 7.50±0.10 7.70±0.20 0.011 Alkalinity 47.00±1.00 49.00±1.00 0.007 COD 2900±101 3000.0±100 0.01 Acidity 50.00±10.10 47.00±3.0 0.006 Hardness 2240±201 2280.0±102 0.01 **EC 5790±120 8740.0±90.0 0.02 TDS 3110±110 4720.0±96.0 0.004 TSS 2333.0±120.00 2333.0±20.0 0.001 Chloride 870.0±65.00 910.0±202 0.01 Nitrate 0.73±0.00 0.31±0.00 0.01 Phosphate 0.49±0.00 0.32±0.00 0.012 Sulphate 204.51±2.52 174.84±10.0 0.01 Chromium 0.07±0.01 0.08±0.01 0.013 Lead 0.25±0.0 0.25±0.03 0.013 Manganese 0.29±0.02 0.30±0.02 0.014 *No units **µS/cm b) Coagulants optimum pH Results for the optimum pH obtained from the coagulation of leachate samples using Ferric Chloride, Ferrous Sulphate, Aluminum Chloride and MOS at varying pH values (4,6,7,8, and 10) to evaluate COD and TSS concentrations in the samples are shown in Figure 3 and 4. All the coagulants were kept at 2g/L in all the runs. The pH with the highest removal efficiency (ER) was taken as the optimum pH for the coagulant. It was noticed t hat all the coagulants gave different results at different pH. FeCl 3 and FeSO 4 had optimum pH of 7 and Alum had optimum pH of 6, while MOS had its optimum pH at a pH value of 10. Volume XXII Issue III Version I 58 ( ) Global Journal of Human Social Science - Year 2022 © 2022 Global Journals B Abatement of Polluting Effects of Waste Dump Leachates using Different Coagulants