Fig. 2

Comparison of physicochemical properties in TWW and NTW. The mean COD level (A), mean BOD (B), mean TDS (D), mean Cr level (E), and mean bacterial load (F) were substantially higher in TWW compared to non-tannery control wastewater with the exception to Mean DO values (C). NTW: non-tannery wastewater; TWW: tannery wastewater.