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Table 1 Physicochemical analysis of tannery effluent

From: Removal of heavy metal chromium from tannery effluent using ultrafiltration membrane

Parameters Raw effluent Accepted limitsa
Physical parameters
 Color Blackish color Colorless
 Odor Disagreeable smell Odorless
 pH 7.43 6.5–8.5
Chemical parameters
 Electrical conductivity (EC) (mS/cm) 27.3 0.288
 Dissolved oxygen (DO) mg/l 0.2 4–6
 Biochemical oxygen demand (BOD) mg/l 2556 30
 Chemical oxygen demand (COD) mg/l 6419 250
 Total dissolved solids (TDS) mg/l 15,900 2100
 Total solids (TS) mg/l 31,740 2200
 Total hardness (TH) mg/l 923 300
 Salinity (mg/l) 16,200 Not mentioned
 Turbidity (NTU) 453 10
 Sodium (mg/l) 5000 1000–1500
 Chromium (Cr) (mg/l) 1055 2.0
  1. Values expressed as mean of six individual values
  2. aISI standards for disposal of industrial wastewater of inland surface water
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