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L- 28L- 28
Tannery Industry
Industrial Waste Treatment
Introduction
• Tannery industry is one of the oldest in
India.
• Usually tannery waste consists of
- Strong odour
- High B...
Manufacturing Process
•It consists of basic three stages
1. Preparation of hides for tanning
2. Tanning proper
3. Finishin...
i] Preparation of hides
1) In first stage hides are washed to
remove dirt and preservative salts
used earlier and then soa...
3) Limed hides are then mechanically
cleaned of hairs and fleshing in
wooden vats with running fresh
waters.
4) Bating pre...
5) The deliming and bating is carried
out in verrrrtically rotating drums in
warm solution of ammonium salts
and enzymes
ii] Tanning proper
•Tanning makes hides
nonputrescible and soft.
•There are two types of tanning
1. Vegetable tanning1. Ve...
Vegetable tanning
• Tannins bind to the collagen proteins in the
hide and coat them causing them to become
less water-solu...
Chrome tanning
•Chromium salts such as chromium
sulphate is used.
•Chrome tanning is faster than vegetable
tanning (less t...
iii] finishing
•Finishing consists of stuffing and fat
liquoring followed by dyeing
Treatment alternative -
Chrome
recoveryrecovery
Objective Questions
1. Two types of tanning processes are
________ and ______ tanning
2. _________ tanning requires very l...
Theory Questions
Q1. Discuss detailed process involved in the
tannery with the help of process flow
sheet.
Q2. Give genera...
L tannery industry
L tannery industry
L tannery industry
L tannery industry
L tannery industry
L tannery industry
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L tannery industry

Lecture notes of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K ORchid College of Engg and Tech,
Solapur

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L tannery industry

  1. 1. L- 28L- 28 Tannery Industry Industrial Waste Treatment
  2. 2. Introduction • Tannery industry is one of the oldest in India. • Usually tannery waste consists of - Strong odour - High BOD,- High BOD, - High pH - High dissolved salts • Treatment of waste is essential before treatment.
  3. 3. Manufacturing Process •It consists of basic three stages 1. Preparation of hides for tanning 2. Tanning proper 3. Finishing3. Finishing
  4. 4. i] Preparation of hides 1) In first stage hides are washed to remove dirt and preservative salts used earlier and then soaked into the fresh water containing NaCl and preservative chemical.preservative chemical. 2) The hides are washed in running water. Washed hides are pasted with lime and sodium sulphide
  5. 5. 3) Limed hides are then mechanically cleaned of hairs and fleshing in wooden vats with running fresh waters. 4) Bating prepares the hides for tanning by reducing pH, reducing swelling and removing the protein degradation products of it.
  6. 6. 5) The deliming and bating is carried out in verrrrtically rotating drums in warm solution of ammonium salts and enzymes
  7. 7. ii] Tanning proper •Tanning makes hides nonputrescible and soft. •There are two types of tanning 1. Vegetable tanning1. Vegetable tanning 2. Chrome tanning
  8. 8. Vegetable tanning • Tannins bind to the collagen proteins in the hide and coat them causing them to become less water-soluble, and more resistant to bacterial attack. • The process also causes the hide to become• The process also causes the hide to become more flexible. • Hides are stretched on frames and immersed for several weeks in vats of increasing concentrations of tannin. Vegetable tanned hide is flexible and is used for luggage and furniture.
  9. 9. Chrome tanning •Chromium salts such as chromium sulphate is used. •Chrome tanning is faster than vegetable tanning (less than a day for this part of thetanning (less than a day for this part of the process) and produces a stretchable leather which is excellent for use in handbags and garments.
  10. 10. iii] finishing •Finishing consists of stuffing and fat liquoring followed by dyeing
  11. 11. Treatment alternative -
  12. 12. Chrome recoveryrecovery
  13. 13. Objective Questions 1. Two types of tanning processes are ________ and ______ tanning 2. _________ tanning requires very less time. 3. Amount of Chromium present in spent3. Amount of Chromium present in spent chrome tan liquor is _______ mg/lit
  14. 14. Theory Questions Q1. Discuss detailed process involved in the tannery with the help of process flow sheet. Q2. Give general characteristics ofQ2. Give general characteristics of Combined waste from tannery industry. Q3. Discuss treatment alternatives for leather tanning industry.

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Lecture notes of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil Prepared by Prof S S Jahagirdar, Associate Professor, N K ORchid College of Engg and Tech, Solapur

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