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Table 2 Physical and chemical characteristics of the untreated and treated effluent

From: Removal of heavy metals from tannery effluent using chitosan-g-poly(butyl acrylate)/bentonite nanocomposite as an adsorbent

Parameters Untreated effluent Treated at pH 3
Physical parameters
 Colour Blackish colour Colourless
 Odour Disagreeable smell Odourless
Chemical parameters
 Electrical conductivity (mS/cm) 27.3 16.6
 Biochemical oxygen demand (BOD) (mg/l) 1250 380
 Chemical oxygen demand (COD) (mg/l) 4210 1320
 Total dissolved solids (TDS) (mg/l) 15,900 9800
 Total solids (TS) (mg/l) 31,740 10,800
 Total hardness (TH) (mg/l) 923 16
 Salinity (mg/l) 16,200 9360
 Turbidity (NTU) 453 18
 Sodium (mg/l) 5000 2900
 Chromium (Cr) (mg/l) 1055 23.05
 Lead (Pb) (mg/l) 0.43 0.34
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