Recycling and Waste Management — DU B.Sc. Polymer Science Previous Year Question Papers

Attempt four questions in all. Draw neat and labelled diagram wherever necessary. (a) (b) (c) (d) What are the importance of sorting in recycling of polymers? Compare different spectroscopic methods of sorting. What are the main features of EPR (extended producer’s responsibility) ? Name 5R’s of waste management and discuss the significance of each of them. (e) What are the liquid on site disposal methods. Discuss in brief. (a) (b) Compare primary and secondary recycling processes. What is gasification process? Explain in detail. (c) Compare pyrolysis and incineration. (a) What are the major challenges faced during EPS recycling? (b) What are the types of selective dissolution? Discuss. (c) Write down the advantages and disadvantages of sink-floatation technique. (a) (b) (c) Describe the chemical recycling method of PET? What is tyre retreading? Discuss its type and the steps followed. Discuss the advantages and disadvantages of addition of recycled powdered rubber in virgin rubber as filler. (a) (b) What is controlled tipping? What are its significance? What are the four pillars of LCA? Discuss. (c) Discuss composting in detail.