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Assignment 2

Question 1 (30 marks)

The waste contributing steps to tomato processing industry is listed below with quantities and biochemical oxygen demand (BOD) and suspended solids (SS) values

Stream

Process Unit

Flow (L/min)

BOD (mg/L)

SS (mg/L)

Prewashing units

1890

180

Washer

1000

340

Boiler feed water

1136

Cooker

3520

7575

Processing unit #1

4410

8890

Processing unit #2

570

230

170

Processing unit #3

380

450

540

a) Provide a suitable waste segregation (separation) and treatment scheme

b) What will be the flow and BOD concentration of the combined stream of #4 and #5

Question 2 (20 marks)

Suggest a treatment method for reuse or by-product recovery for the following wastes.

a. Dairy (milk) waste containing whey (protein) material

b. Cutting oil waste coming from metal cutting machines

c. Dye waste from cloth dyeing (textile) industry.

Question 3 (25 marks)

Using the flow diagram given below explain the role of

i) Filter

ii) Activated carbon

iii) Filter press

iv) Equalization (equalizing) tank.

Question 4 (25 marks)

(a) What are the 2 different environmental problems of using incinerators? How can they be overcome?

(b) Based on the data provided below, calculate the charges for disposal of the waste with and without recycling at the transfer station, and comment on these costs

Waste generated 10 tonnes

Recyclable waste 70 %

Transport costs $ 1 per tonne per km

Distance to landfill 120 km

Location of transfer station mid way

Cost of recovery at transfer station $10 per tonne

Sale value of recyclable goods $15 per tonne

Tipping cost $40 per tonne

Attachments:

assignm-2-bea….docxbeauty-assign….docx