Resource-recovery-171025 PDF

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Resource Recovery Ladokcode: 42RR05 The exam is given to:

5 ECTS

Msc Resource Recovery

ExamCode:

Date of exam: Time:

2017-10-25 9:00-13:00

Means of assistance: English Dictionary

Total amount of point on exam:

30

Requirements for grading: A: 30-27, B: 26-24, C: 23-20, D: 19-17, E: 16-13, F: 12-0 Additional information:

Next re-exam date: v 1; 1-7 January 2018

The marking period is, for the most part, 15 working days, otherwise it’s the following date: Important! Do not forget to write the ExamCode on each paper you hand in. Good Luck! Examiner: Phone number:

1

1.

The most commonly used waste “treatment” is dumping in nature or at dump-sites and combustion with open fire! a. What pollutants does this give rise to? Give 4 examples. (2) b. What is the difference between a city-dump and a land-fill? Try to explain as detailed as possible. (3)

2.

In EU we have Producer Responsibility for some types of waste. a. Why do we have this, what is the purpose?

(2)

b. Whish waste fractions are under the Producer Responsibility in Sweden? Give 6 examples. (2) c. Explain how the company Fti works!

3.

4.

(2)

One group of chemicals are more problematic than the rest, namely the Persistent chemicals or POPs (Presistant organic pollutants). a. What is characteristic for these compounds?

(2)

b. Give 4 examples of compounds that belong to this group.

(2)

When we are using waste for energy conversion by combustion (Waste to Energy) it also results in by products as ash. The resulting ash contains a lot of heavy metals, dioxins and salts making them hard to material recover. a. Give 4 examples on flue gas cleaning devises used and how they work. (2) b. What kind of problems are commonly occurring in the boiler system when combusting waste ? (2)

5.

6.

a) What is the difference between anaerobic and aerobic digestion?

(1)

b) What is most important to get a good aerobic digestion?

(1)

At Stena Aluminium they had two large melting furnaces of 35 Mt each and one small furnace of 1,5 Mt. a. What was the small melting furnace used for?

(2)

b. How much energy is saved by recycling old Aluminium compared to upgrade new raw material? (2)

7. Plastic materials are causing a lot of problems both in the waters and on land all over the world. a. What is monomer recycling? (1) b. Why can’t all plastics be recycled by monomer recycling? (1)

8. Classification of waste is important and highly restricted by laws in EU. Classification as non-hazardous or hazardous waste depends mainly on 14 technical criteria H1 to H14. Give 6 examples on these criteria. (3)

Good luck!...