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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