Page 157 - CAPE Green Engineering Syllabus 2016.docx_Neat

-10- 02265020/CAPE/KMS 2015 SPEC

GREEN ENGINEERING
UNIT 2 - PAPER 02
KEY AND MARK SCHEME

Question 4. (continued)

S.O Suggested Response Mark Marks
Allocation KC AK PA

(a) (iv) 2 2

This can be mitigated by utilizing renewable
energy to recharge the car batteries

(b)(i) 22

Rainwater harvesting is the accumulation and
deposition of rainwater for reuse on-site,
rather than allowing the rainwater to run off.

(b) (ii) 44

A - Coagulation
B - Sedimentation
C - Filtration
D – Storage

b) (iii) 22

Coagulation removes dirt and other particles
suspended in water.
Sedimentation – Using gravity to remove
suspended solids from water. Solid particles
entrained by the turbulence of moving water
may be removed naturally.
Filtration – The water passes through filters,
some made of layers of sand, gravel and
charcoal that help remove even smaller
particles missed by sedimentation.
Storage – Water is placed in a preferably
closed tank or reservoir in order for
disinfection to take place.

TOTAL 20 MARKS 10 10 0