1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Liono4ka [1.6K]
2 years ago
7

Two wastewater treatment plant workers (one male and one female) are exposed to hydrogen sulfide in confined spaces in the treat

ment plant. The average temperature in the wet well is 25oC and the atmospheric pressure is 101.325 kPa. The recommended time weighted average air concentration for occupational exposure to hydrogen sulfide is 15 mg/m3. This concentration is based on an assumption that the individual is generally healthy and is exposed for 8 hours per day, 5 days per week, 50 weeks per year, over a working lifetime (that is from age 18 to 65 years). Assuming average body weights and inhalation rates over the working life of the individual, what is the lifetime (75 years) chronic daily exposure for each individual? Express your answers in mg/kg-day. Is the exposure greater for the manor the woman?

Engineering
1 answer:
Vlada [557]2 years ago
5 0

Answer:

Go to explaination for the details of the answer.

Explanation:

In order to determine the lifetime (75 years) chronic daily exposure for each individual, we have to first state the terms of our equation:

CDI = Chronic Daily Intake

C= Chemical concentration

CR= Contact Rate

EFD= Exposure Frequency and Distribution

BW= Body Weight

AT = Average Time.

Having names our variables lets create the equations that will be used to derive our answers.

Please kindly check attachment for details of the answer.

You might be interested in
A BOD test is to be run on a sample of wastewater that has a five-day BOD of 230 mg/L. If the initial DO of a mix of distilled w
Alexxandr [17]

Answer:

Distribution factor P = =38.33

V = 7.826 ml

Explanation:

given details:

BOD =230 mg/l

DO inital = 8.0mg/l

DO final = 2.0mg/l

we know

BOD = [DO inital -DO final] * distribution factor

230 = [8 - 2] D.F

Distribution factor P = \frac{230}{6}

Distribution factor P = =38.33

THE RANGE OF WASTE WATER VOLUME IN 300 ml bottle is

distribution factor = \frac{300}{V}

V = \frac{300}{38.33}

V = 7.826 ml

6 0
3 years ago
When you see a street with white markings only, what kind of street is it?
Georgia [21]

Answer:

it's a one way street

3 0
3 years ago
100 kg of R-134a at 200 kPa are contained in a piston–cylinder device whose volume is 12.322 m3. The piston is now moved until t
LekaFEV [45]

Answer:

T=151 K, U=-1.848*10^6J

Explanation:

The given process occurs when the pressure is constant. Given gas follows the Ideal Gas Law:

 pV=nRT

For the given scenario, we operate with the amount of the gas- n- calculated in moles. To find n, we use molar mass: M=102 g/mol.  

Using the given mass m, molar mass M, we can get the following equation:  

 pV=mRT/M

To calculate change in the internal energy, we need to know initial and final temperatures. We can calculate both temperatures as:

T=pVM/(Rm); so initial T=302.61K and final T=151.289K

 

Now we can calculate change of U:

U=3/2 mRT/M using T- difference in temperatures

 U=-1.848*10^6 J

Note, that the energy was taken away from the system.  

5 0
3 years ago
Three-dimensional measuring references all of these EXCEPT:
cricket20 [7]
Except the Table of Contents
4 0
3 years ago
Foam weather stripping is often placed in the frames of doors and
Firdavs [7]

Answer:

prevents weathering

Explanation:

6 0
3 years ago
Other questions:
  • Look at the data set below.
    15·2 answers
  • Consider a cubical furnace with a side length of 3 m. The top surface is maintained at 700 K. The base surface has emissivity of
    13·1 answer
  • Draw an ERD for each of the following situations. (If you believe that you need to make additional assumptions, clearly state th
    15·1 answer
  • A resonant six-turn loop of closely spaced turns is operating at 50 MHz. The radius of the loop is λ/30, and the loop is connect
    15·1 answer
  • 1) Relative to electrons and electron states, what does each of the four quantum numbers specify?
    10·1 answer
  • You just purchased a 400-L rigid tank for a client who works in the gas industry. The tank is delivered pre-filled with 3 kg of
    8·1 answer
  • Which of the following correctly explains why it would be beneficial for an engineer to become a member of the Leadership in Ene
    15·2 answers
  • The pressure distribution over a section of a two-dimensional wing at 4 degrees of incidence may be approximated as follows: Upp
    9·1 answer
  • Is a unit of measurement for angles
    15·1 answer
  • Of the core elements of successful safety and health programs, Management Leadership, Worker Participation, and what else relate
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!