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Imagine we have a ‘reset' button for civilization. Assume the city where you currently live in is starting afresh with 5,000 new settlers moving into the area. The population growth is estimated to be 10% on average in the first 10 years and then declines and stabilizes at 5% in Year 15. Modern drinking water supply needs to be installed. You are now contesting to be the chief engineer to lead the designing project for this water treatment plant. You are required to do the following tasks to demonstrate your knowledge and engineering skills:
1. State the principles you apply in your designs; (10%)
2. Enlist all the assumptions; (15%)
3. Estimate the required plant treatment capacity for the next 20 years; (15%)
4. Lay out the flow sheet of the process and justify your choice based on the characteristics of the source water (note: if data not available, you can make your estimations based on other similar sites or commensense); (20%)
5. Estimate the key parameters in the water treatment process including daily flow rate, detention time, geometry and dimension of the sedimentation tank, how many filters and frequency of backwashing if filtration is required, the required amount of chlorine if chlorination is the chosen. (40%)
3.5 Calculate the reactor volumes required to process I043 liter/min of 3 molar .4 in the aqueous reaction A -+ 2B for PFTR and CSTR reactors. (a) 90% conversion, k 2 min-I (b) 99% conversion, k = 2 mole liter-' min-(c) 99.9% conversion, k 2 mole lit..
Equal rates of mass transfer for the production of the fine chemical are required. This is often required for certain types of organic synthesis.
(a) Describe the provisions of Occupational Safety and Health Act 2005 with regard to ‘Substances hazardous to health' (b) Describe four types of hazard which arise from the use of chemicals
A boiler is fired using 200 kg /hr of pure saturated hydrocarbon gas ( Cn Hm ) at atmospheric pressure and 20 oc. The dry analysis of the flue gas which leaves the boiler at atmospheric pressure and 300 oc is CO2 =..
Fresh halibut livers containing 25.7 wt % oil are to be extracted with pure ethyl ether to remove 95% of the oil in a countercurrent multistage leaching process. Calculate the amounts and compositions of the exit streams and the total number of the..
question 1a with the help of a labeled drawing discriminate between the first-stage biochemical oxygen demand bod and
Indium antimonide (InSb) is a semiconductor with a narrow band gap of 0.17eV and an intrinsic carrier concentration of 2×1016cm-3. The mobility of electrons in InSb is 78000 cm2/V⋅s and their effective mass is 0.014m0, while the holes have a mobility..
Determine the pinch temperatures and the minimum utility requirements for the streams set out in the table below, for a minimum temperature difference between the streams of 20 °C. Devise a heat-exchanger network to achieve the maximum energy reco..
The gases enter the condenser at 230 °C and leave at 50 °C. The cooling water enters the tubes at 20 °C and leaves at 50 °C. Suggest suitable materials of construction for the shell and the tubes.
the equilibrium constant K for the reaction - what is the concentration of SO3 at equilibrium?
A value of mass transfer coefficient kg = 0.0150 kg /m2-s . it was also found that the corresponding heat transfer co efficient = hc = 15 j /m2-s
What is the identity of the solid? Give the balanced equation of this species decaying by -particle production. Why is the solid a more potent a-particle producer?
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