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Courses Name: Environmental Health
need new and unique answers, please. (Use your own words, don't copy and paste)
Please i need more than 500 words
Q. 1. Explain the environmental pollution (air, water, soil and food) health issues in KSA.
Q. 2. Describe the sources and pathways of exposure groups.
Q. 3. Enumerate methods to control and prevent pollution.
Q. 4. How public health policy and environmental law supporting to promote public health?
Please i need more than 500 words
In: Other
Question 1)
About 90% of the gold ever mined throughout human history is still
in circulation; however, only about 55% of all the silver ever
mined is still in circulation. Why do you think there is such
a difference? Explain.
Question 2)
Categorize each of the following words or phrases as being
associated with either open-pit mining (O) or underground mining
methods (U)
dust and sedimentation problems
["U", "O"]
use drifts and stopes
["U", "O"]
more dangerous
["O", "U"]
best for disseminated ores
["O", "U"]
more waste
["U", "O"]
use benches
["O", "U"]
best for vein ores
["O", "U"]
far cheaper
["O", "U"]
requires high grades
["O", "U"]
In: Other
one mole of a liquid solution containing 60.0 mole% benzene and the remainder toluene enters a flash column.The liquid product stream contains 47.0 mole% benzene and the vapor product stream contains 69.0 mole % benzene.The temperature of both output stream is at 93oC.If the operation is adiabatic,what is the temperature of the input stream that enters the flash column?
In: Other
Should Pluto be classified as a planet or not? If so, why, and would this open the classification of many objects in our solar system? If Pluto is not a planet, why not? explain briefly.
In: Other
Feijoa juice is being concentrated using an
ultrafiltration membrane to remove excess water. The dilute feed
flows in at 600 m/hr with 5 % solids (wt/wt) and density 1015
kg/m3. The desired concentration of the juice is 16 % total solids.
A tubular membrane system is chosen, with membrane tubes of 3 cm
internal diameter. The system operates with a pressure differential
of 3000 kPa applied across the membrane.
a) What is the main advantage of using membrane separation to
concentrate feijoa juice instead of evaporation?
b) Determine the mass flow rates of the feed, permeate and
retentate streams in kg/s.
c) If the permeability constant of the membrane is 5 × 10-5 kg/[m2
kPa s], what is the total length of membrane tube required?
d) Explain how concentration polarisation will affect transmembrane
flux in this process. You may include relevant equations in your
explanation.
In: Other
Write an essay on the logic of Songhay's “hauka” spirit possession ritual, based on the book Fusion of the Worlds. “Logic” has to do with reason and rationality. What’s the reason for the “hauka” ritual, and what makes it rational, from the Songhay point of view? Be sure to describe the “hauka” possession ritual in as much detail as possible. In what ways do the details of the ritual help us understand the “logic” of the ritual?
In: Other
describe and elaborate on the importance of East Timor. Include qualitative AND quantitative information, including countries, cities, dates, and names.
explain its significance.
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Write the stoichiometric equations for the combustion of methane with oxygen to form (a) CO2 and H2O and (b) CO and H2O; and for the combustion of ethane with oxygen to form (c) CO2 and H2O and (d) CO and H2O. Then prove that only three of these four reactions are independent.
In: Other
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Use your knowledge of the coast/the beach to illustrate how the lithosphere, biosphere, atmosphere and hydrosphere are all interconnected specifically in that region.
In: Other
The reaction between ethylene and hydrogen bromide to form ethyl bromide is carried out in a continuous reactors. The product stream is analyzed and is found to contain 50 mole % C2H5Br and 33.3 % HBr. The feed to the reactor contains only ethylene and hydrogen bromide.
What would be the fractional conversion of the limiting reactant and the percentage by which the other reactant is said to be its excess.
In: Other
What values can be calculated given only the mentioned data?
The flue gas from a furnace burning a fuel of negligible
nitrogen content is found to contain 12% CO2, 7.2%
O2, 1.1 % SO2 and 79.7%
N2
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What are the values of the indo-burma hotspot, you will need to highlight why this particular hotspot is important including its ecosystem services. You will also need to discuss why this particular hotspot is so important in terms of both local and global sustainability considering all three pillars: environment, economy and society.
In: Other
When a chemical plant needs steam at multiple pressure levels, it is often economical to generate all the steam at a high pressure and then to let the steam down through pressure-reducing turbines to the desired pressure. This principle is illustrated in Figure 8.6. The downside of this approach is that as the exhaust pressure of the turbine increases, the theoretical (and actual) steam requirements increase, meaning that less energy is extracted. To illustrate this point, do the following:
a. Estimate the amount of energy extracted from 10,000 kg/h of 58.6 barg steam superheated by 165°C when connected to the following turbines (each 80% efficient):
i. Exhaust pressure is 4″ Hg absolute.
ii. Exhaust pressure is 4.82 barg.
b. Estimate the amount of energy extracted from 10,000 kg/h of saturated, 10.0 barg steam when connected to a turbine (80% efficient) exhausting at 4.82 barg.
c. Identify the locations of each of the three turbines described above on Figure 8.6.
From the book "Perrys Chemical Engineers", 6th ed Figure 8.5 and 8.6
In: Other