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Table 7 Comparison of scoria and pumice filter media efficiency in tannery wastewater treatment

From: Identification of two low-cost and locally available filter media (pumice and scoria) for removal of hazardous pollutants from tannery wastewater

Parameters % removal at RT = 24 h % removal at RT = 48 h % removal at RT = 72 h
Pumice Scoria Pumice Scoria Pumice Scoria
BOD5 56 52 57 55 62 59
COD 27 48 30 50 45 54
TSS 65 75 68 83 70 84
NH4–N 41 32 28 27 23 6
NO2–N 88 98 95 98 97 97
NO3–N 40 51 56 80 95 99
PO4–P 41 57 51 60 66 63
Sulfide 70 73 71 75 72 77
Sulfate 84 77 83 76 83 75
Total chromium 76 71 76 71 70 69
Average 58.8 63.4 61.5 67.5 68.3 68.3