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

Table 2: Summary of comparison of coagulants optimum dosage parameters Parameters Raw FeCl 3 (3g/L) FeSO4(3g/L) ALUM(5g/L) MOS(5g/L) WHO Standard FMENV Limit For Discharge To The Environment COD (mg/L) 3000 1770 1875 1730 0 60.9 60.9 TSS (mg/L) 2369 207 1637 368 1047.5 25 25 Chromium (mg/L) 0.0750 0.0105 0.0105 0.0045 0.0133 0.0500 0.0500 Lead (mg/L) 0.2500 0.0490 0.0395 0.0175 0.0110 0.0500 0.0500 Manganese (mg/L) 0.2950 0.0705 0.0645 0.0355 0.0365 0.0500 - Over all, Alum was a better coagulant than the three other coagulants in reducing the physical and chemical parameters of leachates. d) Seasonal Variations of Leachate Concentration The test was carried out both in the dry and wet seasons to determine effect of season on the efficiency of coagulants. Table 4 and 5 is a summary of the physical and chemical properties of the raw and treated leachate samples for dry and wet seasons. It was shown that the physical and chemical properties of the leachates are higher in the wet season than in the dry season. This can be attributed to the fact that rainfall is a crucial factor in the formation of leachate and the characteristic of the leachate. Season has no effect on the efficiency of coagulants. The trend of the removal efficiency of each coagulants tested in dry season is similar to that of the wet season. Table 4: Summary of Physical and Chemical Parameters of Raw Leachates and Treated Leachate in the Dry Season Raw Leachate After treatment FeCl 3 After treatment FeSO 4 After treatment Alum After treatment MOS COD (mg/L) 2900.0±100.50 b 2216.0±274.32 a 2038.0±177.68 a 2010.0±274.32 a 3100.0±268.23 b TSS (mg/L) 2333.0±120.00 c 1037.9±295.90 a 1726.5±383.22 b 717.56±295.90 a 1246.5±159.15 ab Cr (mg/L) 0.07±0.01 c 0.02±0.00 b 0.01±0.01 ab 0.01±0.00 a 0.02±0.00 b Pb (mg/L) 0.25±0.03 c 0.07±0.02 b 0.06±0.02 ab 0.04±0.02 a 0.04±0.02 a Mn (mg/L) 0.29±0.02 c 0.09±0.02 b 0.08±0.02 b 0.05±0.02 a 0.06±0.02 a Table 5: Summary of Physical and Chemical Parameters of Raw Leachates and Treated Leachate in the Wet Season Raw Leachate After treatment FeCl 3 After treatment FeSO 4 After treatment Alum After treatment MOS COD (mg/L) 3000.0±100 b 2350.0±288.57 a 2170.0±163.25 a 2122.0±288.57 a 3270.00±279.52 b TSS (mg/L) 2333.0±20.0 c 1074.2±295.98 a 1591.0±136.38 b 717.6±295.98 a 1246.6±159.21 ab Cr (mg/L) 0.08±0.01 c 0.02±0.00 b 0.02±0.01 ab 0.01±0.00 a 0.02±0.00 b Pb (mg/L) 0.25±0.03 c 0.07±0.02 b 0.06±0.02 ab 0.04±0.02 a 0.04±0.02 a Mn (mg/L) 0.30±0.02 c 0.09±0.02 b 0.08±0.02 b 0.05±0.02 a 0.06±0.02 a © 2022 Global Journals Volume XXII Issue III Version I 63 ( ) Global Journal of Human Social Science - Year 2022 B Abatement of Polluting Effects of Waste Dump Leachates using Different Coagulants