past year q cbe675

1. CONFIDENTIAL EH/JAN 2013/CHE675
UNIVERSITI TEKNOLOGI MARA
FINAL EXAMINATION
COURSE
COURSE CODE
EXAMINATION
TIME
ENVIRONMENTAL ENGINEERING
CHE675
JANUARY 2013
3 HOURS
INSTRUCTIONS TO CANDIDATES
1. This question paper consists of five (5) questions.
Answer ALL questions in the Answer Booklet. Start each answer on a new page.2.
3.
4.
Do not bring any material into the examination room unless permission is given by the
invigilator.
Please check to make sure that this examination pack consists of:
i) the Question Paper
ii) a one - page Appendix
iii) an Answer Booklet - provided by the Faculty
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO
This examination paper consists of 5 printed pages
) Hak Cipta Universiti Teknologi MARA CONFIDENTIAL

2. CONFIDENTIAL 2 EH/JAN 2013/CHE675
QUESTION 1
(P01, P02, C01, C02, C5, C6)
A new wastewater treatment plant consisting of two treatment units namely primary settling
basin (primary treatment) and facultative pond (secondary treatment) is proposed to be built
in a fruit processing plant that you are currently working at. Two main influent parameters of
the wastewater are BOD5=300 mg/l and SS=400mg/l with the average flow rate of the
influent is 8,000 m3
/d.
a) Design the two treatment unit when the removal of SS in the settling basin is 70%
and the removal of BOD in the facultative pond is 90% with dispersion factor, cf=0.5
V
and the reaction coefficient, k is 0.6 d"1
at 30°C. Given detention time, 0 = — . State
any assumptions used in your design. Refer to Appendix 1 and 2 to help you on the
assumptions made.
(15 marks)
b) Justify whether the proposed plant can treat those parameters in (a) to comply with
Standard A of Environmental Quality Act 1974 whereby the BOD5 and SS limit are
20 mg/l and 50 mg/l respectively.
(2 marks)
c) What is your suggestion if any of those influent parameters cannot be treated using
the two proposed treatment units?
(3 marks)
QUESTION 2
(P01, P02, C01, C02, C2, C4)
a) Wind is one of the important vehicles in the transportation, distribution and
dispersion of air contaminants. Debate this issue thoroughly in the perspective of
environmental engineering in devising the technologies for air pollution prevention.
(6 marks)
b) Effect of lapse rate on plume behavior can be categorized by the several patterns
and might be used to predict the gases emitted from the stack. Analyze the pattern
of plumes based on the ambient condition below.
i) superadiabatic
ii) subadiabtic
iii) inversion
(6 marks)
© Hak Cipta Universiti Teknologi MARA C O N F I D E N T I A L

3. CONFIDENTIAL 3 EH/JAN 2013/CHE675
c) Local meteorological data are necessary for the effective design of a stack. With the
following information, determine the effective height of a stack situated in Shah Alam
Industrial Park.
Physical stack is 190 m tall with 0.98 m inside diameter
Wind velocity is 2.8 m/s
Air temperature is 25 °C
Barometer pressure is 1010 millibars
Stack gas velocity is 12.0 m/s
Stack gas temperature 160 °C
(8 marks)
QUESTION 3
(P01.P02, C01.C02.C4,)
You are a SHE officer of the waste oil recycling facility at Industrial area of Gebeng
Kuantan. In line with the commitment of the Government of Malaysia to reduce waste
volume and improve waste management practices, you have been asked by the company
to propose the best practices technology of the existing scheduled waste recovery Plant at
Industrial Area of Gebeng, Kuantan. It is anticipated that the Proposed upgrading of the
existing Plant shall enable the organization to receive and treat the scheduled waste in the
immediate future and thus reducing the overall volume of final disposal for these waste
products. Table 1 shows the detailes about the project.
Table 1 Project detailes
Project description
Process description
Amount of oily waste to
be collected
The proposed project will involve construction of the
plant and plant operation
a) The proposed industry is able to recover up to
maximum 90% of useable components from the
waste collected to produce base oil.
b) The plant is designed to handle oily wastes at
maximum of 9 MT/hr. This is based on the
capability of the machine that to be employed
which is having a capacity of 3 units Oil Purifier
SNE 328 - 3 MT/hr per unit.
c) The machine selected for the recovery plant uses
the Intensify Hydrophilic Technology which able
to change the reciprocity between oil and water
so that the water will be separated from the oily
waste.
SW305( 55.6%), SW306( 9.3% ), SW307 (7.4% ), SW
309 ( 23.1%) and SW312(4.6% )
© Hak Cipta Universiti Teknologi MARA CONFIDENTIAL

4. CONFIDENTIAL 4 EH/JAN 2013/CHE675
a) Define scheduled waste according to Environmental Quality Act (EQA) 1974.
(2 marks)
b) Sketch the proposed process flow chart of oily waste recovery plant by including
processes such as spent extraction, filtration, solvent recovery and shorth path
distillation.
(4 marks)
c) As a SHE officer you have to comply with related regulations under EQA 1974. What
are the legal requirements needed in order to construct new oily waste recovery
plant.
(4 marks)
d) Based on the collected oily waste in the future, assess the total amount of generated
schedule waste. If the amount is more than 20 tons what are the advices that should
be given to the top management. Suggest the other rules obligated under
Environmental Quality Regulation 2007 to support the actions.
(10 marks)
QUESTION 4
(P08, C03, C2, C4)
EIA is a study to identify, predict, evaluate and communicate information about the impacts
on the environment of a proposed project and to detail out the mitigating measures prior to
project approval and implementation. !
a) As of 14 January 1999, the Department of Environment requires detailed EIA for a
total of 13 projects. State any five types of this project.
(6 marks)
b) Briefly explain three objectives of performing detailed environmental impact
assessment on new development or expansion of current facility.
(6 marks)
c) The methodologies for conducting Preliminary Assessment are comparable to
Detailed EIA. Differentiate procedural steps for Preliminary Assessment versus
Detailed EIA.
(8 marks)
© Hak Cipta Universiti Teknologi MARA CONFIDENTIAL

5. CONFIDENTIAL 5 EH/JAN 2013/CHE675
QUESTION 5
(P08, C03, C2, C4)
The field of green technology encompasses a continuously evolving group of
methods and materials, from techniques for generating energy to non-toxic cleaning
products.
a) Describe the relationship between green chemistry, green engineering, and
sustainability in green technology.
(4 marks)
b) Explain four objectives of green technology.
(4 marks)
c) Discuss six possible challenges might arise in green technology.
(12 marks)
END OF QUESTION PAPER
© Hak Cipta Universiti Teknologi MARA CONFIDENTIAL

6. CONFIDENTIAL APPENDIX 1 EH/JAN 2013/CHE675
LIST OF FORMULA
Head loss, fit = - -
' eZffdp
Where L= depth of the filter, m
e= porosity of bed
Vs=filtering velocity, m/s
g= gravitational acceleration, m/s
dp= diameter of filter media grains, m
firction factor, f = 1 5 0 ^ + t 75
Where Re = ^ ^
Re
Terminal velocity (for laminar flow), vt ff(pp-pwydz
Where pp= particle density, kg/m3
pw= water density, kg/m3
|i=water viscosity, kg/m3
Terminal velocity, v f = *g&=£s)*
Cn = —(.Icaninar)
ft 3
Cg = — + -—£ + 0.34 (prwtsitiemai)
C& = 0.4 (turbulent')
Depth of fluidized bed, Lfjj = L (l-ef&)
enj= porosity of fluidized bed
© Hak Cipta Universiti Teknologi MARA CONFIDENTIAL