Page 104 - CAPE Green Engineering Syllabus 2016.docx_Neat

-13- 02165020/CAPE/KMS 2015 SPEC

GREEN ENGINEERING
UNIT 1 - PAPER 02
KEY AND MARK SCHEME

Question 6.

S.O Suggested Response Mark Marks
Allocation KC AK PS

1:3:6 (a) 1. The substitution of metal working 3 6
fluids (MWFs) components with 3
alternatives that are more
inherently benign than traditional
MWF ingredients. Principle 1 relates
to this innovation since the product
designers need to ensure that
material and energy inputs and
outputs are inherently non-
hazardous as possible.

2. The newly formulated MWFs prevent
environmental impacts since it can
be reused again and not disposed.
This illustrates Principle 2 which
places emphasis on the prevention of
waste rather than treatment or
cleaning of such.

3. The new MWF formulations are based
on oil and non-ionic surfactants
that can be produced from renewable,
bio-based resources. This
demonstrates Principle 12 because
the designs should be based on
renewable and readily available
inputs throughout the life cycle.

4. The new MWF formulations can allow
oil separation by the addition of a
simple salt. Principle 3 makes
mention that separation and
purification operations should be a
component of the design framework.

5. The new MWFs can allow oil recovery
and reuse (Principle 6 and 10).

(2 marks for stating correctly)
(4 marks for explaining)