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
Boiler feed water
Processing unit #1
Processing unit #2
Processing unit #3
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
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