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L dairy 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 dairy industry

  1. 1. L-25 Dairy Industry Industrial Waste Treatment
  2. 2. Introduction • Demand of milk and milk products is increasing day by day. • Dairies collect milk from farmers and either they bottle it or manufacture various milk products.milk products. • During these processes large quantity of wastewater is generated. • Dairy waste though biodegradable but very strong in nature.
  3. 3. The dairy industry is divided into two main production areas: 1. The primary production of milk on farms-the keeping of cows (and other animals such as goats, sheep etc.) for the production of milkgoats, sheep etc.) for the production of milk for human consumption; 2. The processing of milk with the objective of extending its saleable life. This objective is typically achieved by:
  4. 4. (a)Heat treatment to ensure that milk is safe for human consumption and has an extended keeping quality, and (b) Preparing a variety of dairy products in a semi-dehydrated or dehydrated forma semi-dehydrated or dehydrated form (butter, hard cheese, ghee and milk powders), which can be stored.
  5. 5. Sources of wastes • The liquid waste from a large dairy originates from following sections :- 1. Bottling plant 2. Cheese plant 3. Butter plant3. Butter plant 4. Condensed milk plant 5. Ghee making plant 6. Milk powder plant and 7. Ice cream plant 8. Cleaning and washing of reactors
  6. 6. Washing of Cans waste Bottling plant
  7. 7. Whey Powder making in Cheese making plant making in evaporator
  8. 8. Pasteurization Ripening Cream Bacteria Culture Selected Acid (L.A.) ButterChurning Butter Granules Packing Buttermilk To Users Butter making plant
  9. 9. Dry milk powder plant Evaporation Skimmed milk Drying Powder packaging To users
  10. 10. Ice Cream plant Mixing Water, cream, butter, milk and whey powders HomogenizationHomogenization Pasteurization Ageing Flavours, colours and fruits Freezing Packing
  11. 11. COD and BOD of milk products
  12. 12. Composition of wastewater of typical dairy Item Value pH 7.2 (6.5 to 8) Alkalinity 600 mg/lit as CaCO3 TDS 1060 mg/lit (1200 to 1800) SS 760 mg/lit (600 to 900)SS 760 mg/lit (600 to 900) BOD 1240 mg/lit COD 1840 mg/lit Total nitrogen 84 mg/lit Phosphorus 11.7 mg/lit Oil and Grease 290 mg/lit (250 to 350) Chlorides 105 mg/lit
  13. 13. Treatment alternatives
  14. 14. 1. To be used for irrigation after primary treatment Screens Oil and grease trap Dairy waste For irrigationwaste irrigation
  15. 15. 2. Low cost Treatment Screen chamber Stabilization pond O and G trap Dairy waste Effluent
  16. 16. 3. ASP Secondary SST
  17. 17. Objective Questions 1. pH of dairy waste is in the range of ____________. 2. ____________ trap is needed for treatment of dairy waste. 3. Oil and grease present in the dairy waste is in the range of ___________.
  18. 18. Theory questions Q1. W r t dairy industry draw manufacturing flow sheets of i. Milk receiving and Bottling plant ii. Cheese making plant iii.Butter manufacturing plant iv.Ice cream plantiv.Ice cream plant v. Dry milk powder plant Q2. Draw Process flow sheet of a dairy and clearly mention sources of wastewater generation. Q3. Give general characteristics of dairy waste. Q4. Discuss various treatment alternatives for dairy waste with the help of neat flow diagrams

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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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