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Tannery Industry

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Tannery Industry

  1. 1. A Brief Review of “Tannery” By- Saurabh Kulkarni
  2. 2. Scope of the Presentation: • Necessity of Tanning •Manufacturing Process Of leather •Raw Materials And Chemicals used for tanning • Waste characterization •Suggested Treatment
  3. 3. Tanning and its Necessity: Definition: “Tanning is the process of making leather, which does not easily decompose, from the skins of animals, which do.” How does tanning work? Tanning is a reaction between the collagen of the skin which is the middle layer of the skin and different chemicals. During tanning, Cross links are formed between the collagen fiber structure and the fiber does not shrink due to bacterial action, hydrolysis and high temperatures
  4. 4. Manufacturing process flow chart
  5. 5. Chemicals used: Liming: Slaked lime Sodium sulfide Sodium Hydroxide Sodium Hydrosulfite Arsenic sulfide Calcium Hydrosulfide Dimethyl Amine Sodium Sulphydrate Soaking: Chloral Sodium tri chloro phenate Deliming: Hydrochloric acid Sulfuric acid formic acid Acetic acid Chrome Tanning Chromium sulfate Chromium Chloride Sodium Carbonate
  6. 6. Water Requirement l/d/ 100kg hide
  7. 7. Waste Water Generation l/d/100kg hide
  8. 8. Characteristics of Waste Water: Process wise Waste Water Vol. Of waste/100k g skins in l pH TS mg/l SS mg/l BOD5 Soaking 250-400 7.5-8 8000-28000 2500-4000 1100-2500 Liming 650-1000 10-12.5 16000- 45000 4500-6500 6000-9000 Deliming 700-800 3-9 1200-12000 200-1200 1000-2000 Vegetable tanning 200-400 5-6.8 8000-50000 5000-20000 6000-12000 Pickling 200-300 2.9-4 16000- 45000 600-6000 600-2200 Chrome tanning 400-500 2.6-3.2 2400-12000 300-1000 800-1200 Composite 3000-3500 7.5-10 10000- 1250-6000 2000-3000
  9. 9. Characteristics of Waste Water: Final output Characteristics Amount Mg/l Salinity 12000-23000 BOD 6000-12000 Cr-3 100-200 Cr-6 Nil Chlorides 2000-2000 Colour Present Brownish red Odour Strong Pungent
  10. 10. CPCB Norms Pollutant Concentration in mg/l pH 6.5-9.0 *BOD (at 27°C, 3 days) 100 Suspended solids 100 Total chromium (as Cr) 2 Oil and grease 10 Sulphides (as S) 1
  11. 11. Suggested Treatment
  12. 12. THANK YOU
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