Questions
Suppose you have an electrostatic precipitator currently operating at 90% for 3 µm diameter particles and...

Suppose you have an electrostatic precipitator currently operating at 90% for 3 µm diameter particles and you need to increase the efficiency to 98% to comply with your operating permit.
a. Using the Deutsch equation, identify three parameters you could change in order to increase your efficiency. By what percentage would you have to change each separately to achieve your goal?
b. Suppose that you decide simply to add a cyclone in series with the ESP in order to reduce the PM concentration in the flue gas, rather than changing the ESP parameters as in part a. What must the control efficiency of the cyclone be in order for the combined control efficiency to be 98%?
c. For most of the course we have assumed PM as solid, spherical particles with a density of 2200 kg/m3. Suppose our control system must capture particles of zinc with a density of 7140 kg/m3. How much will this alteration increase or decrease the efficiency of our combined ESP-cyclone system?

In: Civil Engineering

1-What is job hazard analysis? 2-Why is job hazard anaylsis so important? 3-How do you identfy...

1-What is job hazard analysis?
2-Why is job hazard anaylsis so important?
3-How do you identfy workplace hazards?
4-How do you correct and prevent any hazard?
5-When is it appropriate to hire a professional to conduct a job hazard analysis?
6-Prevention rules workers exposure to COVID-19.

Hello, I've been researching my homework for several days. I did not find very good answers. There should also be a bibliography or book title about the answers.

Occupational health and safety lesson homework

In: Civil Engineering

List eleven tests conducted on soils from a soils investigation. a- Indicate whether each test requires...

List eleven tests conducted on soils from a soils investigation.
a- Indicate whether each test requires a disturbed or undisturbed sample.

b- Indicate whether each test is used from granular or clay soils.

In: Civil Engineering

Suppose a gaseous substance is emitted by an industrial facility, outside of a city, and that...

Suppose a gaseous substance is emitted by an industrial facility, outside of a city, and that this substance has a very low inhalation LD50 value of 0.2 µg/kg/day.
a. Explain the meaning and units of LD50. Given the ‘very low’ description, would you guess that the substance is generally toxic or non-toxic? Explain your answer.
b. A low-pressure system is sitting over the city. How will this affect the transport of the pollutant relative to the city center, i.e., will it move towards or away the center, and why?
c. Assuming that city authorities do not know the source of the pollutant at first, suggest how monitoring equipment could be used/deployed around the city in order to determine the direction of the point source.
d. Suppose the industrial facility is in a rural area and has plenty of land, and now needs to control a relatively small volumetric flow Q of the gaseous pollutant. What control technology would you suggest and why? (Hint: there are two good options.)

In: Civil Engineering

For dispersion modeling we want to find the concentration of a pollutant at a location (x,y,z)...

For dispersion modeling we want to find the concentration of a pollutant at a location (x,y,z) in 3-D space, relative to a point source at (0,0,H). How is the x distance downwind accounted for in the Gaussian dispersion equation?

In: Civil Engineering

Why is including the mirror-image plume important in the Gaussian dispersion equation? Now suppose z =...

Why is including the mirror-image plume important in the Gaussian dispersion equation? Now suppose z = 4H. How much does including the mirror-image plume affect the final downwind concentration at this height?

In: Civil Engineering

write a one small report or describe ( defention , types etc ... ) these three...

write a one small report or describe ( defention , types etc ... ) these three in surveying
1- longitudinal profiles
2- cross sections
3- contour maps

more than a hundred words

In: Civil Engineering

What are the typical ranges of drying shrinkage and creep strains in concrete; what is their...

What are the typical ranges of drying shrinkage and creep strains in concrete; what is their significance?

In: Civil Engineering

The following are balanced interior angles to the right for a five-sided traverse. Given the Azimuth...

The following are balanced interior angles to the right for a five-sided traverse. Given the Azimuth of course AB is 250°00’00”, compute and tabulate the azimuths for each side of the traverse. A = 82°13’15” B = 106°35’18” C = 28°45’06” D = 205°14’56” E = 117°11’25”

In: Civil Engineering

List the most important factors that affect drying shrinkage and creep, and discuss when the effects...

List the most important factors that affect drying shrinkage and creep, and discuss when the
effects are similar or opposite?

In: Civil Engineering

In a quality control test of a highway project, the following data was collected as shown...

In a quality control test of a highway project, the following data was collected as shown below. Bulk specific gravity of the compacted mix is 2.30, Bulk Specific gravity of aggregate=2.75, The percentage of bitumen absorption is 0.45%, The percentage of binder by mass=5.5%,Bitumen Specific Gravity=1.05, answer the following questions: What is the percentage of Air voids in the compacted mix?

Aggregate effective specific gravity?

In: Civil Engineering

Please answer the following question. a. How can you organizes and coordinates the daily operations of...

Please answer the following question.

a. How can you organizes and coordinates the daily operations of assigned staff to meet work goals such as ensuring activities are in compliance with all laws, policies, regulations and goals?

b. How can you demonstrate continuous effort to improve operations, decrease turnaround times, streamline work processes, and work cooperatively and jointly to provide quality seamless customer service?

c. How can you prioritize and coordinate work assignments such as training, coaching and instructs employees as required, monitor work and evaluates performance?

In: Civil Engineering

determine the time of concentration for a flow which travels 50 m over average grass on...

determine the time of concentration for a flow which travels 50 m over average grass on a slope of 5 percent and 100 m over concrete pavement with a slope of 1 percent.

In: Civil Engineering

An unconfined aquifer made up of silt loam has an initial piezometric surface of 40 m....

An unconfined aquifer made up of silt loam has an initial piezometric surface of 40 m. If wells 28 m and 15 m away from the pumping well have drawdowns of 4 m and 8 m, respectively, what is the pumping rate (m3/d) of the well?

Based on this, if you wanted to keep the same drawdowns at the observation wells, but needed a drawdown of 10 m in your pumping well, what diameter would the pumping well casing need to be?

In: Civil Engineering

3:Why batteries are needed in stand alone wind turbine? Explain the type of batteries used in...

3:Why batteries are needed in stand alone wind turbine? Explain the type of batteries used in wind turbine.

In: Civil Engineering