GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2152303 Date: 31/05/2019Subject Name: Plastics Recycling & Waste Treatment
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define: Primary recycling, Secondary recycling and Tertiary 03
recycling.
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(b) Explain density separation (Float/sink) with flow diagram. 04(c) Discuss secondary recycling by co-extrusion and co-injection 07
molding for production of sandwich structure.
Q.2 (a) Which are the sources of Plastics waste? Discuss. 03
(b) List various size reduction techniques and explain any one. 04
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(c) Explain PET Glycolysis process with neat flow diagram. 07OR
(c) Discuss cryogenic grinding method for granulating difficult 07
materials.
Q.3 (a) Define: Pyrolysis. Give advantages of Pyrolysis. 03
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(b) Discuss various separation methods used for plastics waste. 04(c) Explain with suitable example, degradation mechanisms of 07
thermoplastics due to repetitive processing.
OR
Q.3 (a) Explain recycling of PU using hydrolysis process. 03
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(b) With neat flow diagram explain solvent separation process. 04(c) Write a note on: Plastics in Landfill. 07
Q.4 (a) Which are the 3 R’s of waste management? Discuss. 03
(b) Draw flow diagrams for (i) Conversion of HDPE/PP woven 04
sacks (i) HDPE containers waste to molded Products.
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(c) Discuss In-line- automatic recycling systems with neat 07diagram.
OR
Q.4 (a) What are biodegradable plastics? How they are helpful in 03
plastic waste management.
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(b) Discuss various problems associated with the incineration of 04plastics.
(c) Write a note on: Medical plastics waste management. 07
Q.5 (a) Discuss the use of plastics waste as fillers. 03
(b) Explain about Rotory kiln and Fluidized bed Pyrolysis 04
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Reactor with schematic diagram.(c) Give plastics identification codes for recycling with their 07
properties and applications.
OR
Q.5 (a) How Plastic waste is used in Road construction? Discuss. 03
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(b) Discuss various technical approaches to secondary recycling. 04(c) With neat diagram explain various types of granulators and 07
knifes used for recycling.
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