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Table 1 Initial parameters of tannery wastewater

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

Parameters Raw effluent collected Maximum tolerance limits for industrial effluents discharged (mg/l)
Into inland surface water Into public sewers
Physical parameters  
 Colour Blackish colour Colourless
 Odour Disagreeable smell Odourless Unobjectionable
 pH 7.43 5.5–9.0 5.5–9.0
Chemical parameters  
 Electrical conductivity (EC) (mS/cm) 27.3 0.288
 Biochemical oxygen demand (BOD) (mg/l) 1250 30 350
 Chemical oxygen demand (COD) (mg/l) 4210 250
 Total dissolved solids (TDS) (mg/l) 15,900 2100 2100
 Total solids (TS) (mg/l) 31,740 2200
 Total hardness (TH) (mg/l) 923 600 300
 Turbidity (NTU) 453 10 5
 Sodium (mg/l) 5000 60
 Chromium (Cr) (mg/l) 1055 0.1 2.0
 Lead (Pb) (mg/l) 0.43 0.1 1.0
  1. Values expressed are as per the regulations given by (1) ISI standards for disposal of industrial wastewater. BIS (IS: 10500: 1991) and (2) Central Pollution Control Board. (1986), Pollution Control Acts, Rules, and Notifications issued there under. Fourth edition pp. 358–359. New Delhi, CPCB, Ministry of Environment and Forests. 897 pp
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