Env Eng Exam Prep Problem 24 JUL 2007

[Guest]

The following test results were obtained from for a wastewater sample taken at the headworks to a wastewater treatment plant. Aoll of the tests were performed using a 50-mL sample size. Determine concentration of:

1. Total Solids (TS);

2. Total Volatile Solids (TVS);

3. Suspended Solids (SS); and

4. Volatile Suspended Solids (VSS).

The sampling data are:

Tare mass of evaporating dish = 53.5433 g

Mass of evaporating dish plus residue after evaporating at 105 deg C = 53.5793 g

Mass of evaporating dish plus residue after ignition at 550 deg C = 53.5742 g

Tare mass of Whatman GF/C filter = 1.5433 g

Residue on Whatman GF/C filter after drying at 105 deg C = 1.5553 g

Residue on Whatman GF/C filter after ignition at 550 deg C = 1.5531 g

Results are provide in

Spoiler

SPOILER

<<Highlight by moving cursor over blackened boxes>>

Spoiler

1. TS = 720 mg/L

2. VS = 102 mg/L

3. SS = 240 mg/L

4. VSS = 44 mg/L

JR

 

[RIP - VTEnviro]

Dammit dude, you just gave me a flashback to my senior year WW treatment class.

 

[Dleg]

Don't seem to be getting much response in the Enviro forum. Maybe this test question will heat things up:

102. A jet aircraft operating at full throttle burns JP4 jet fuel at a rate of 54 lbs / min. If the aircraft is positioned on a conveyor belt that is moving in the opposite direction, but at the same identical speed, would the aircraft meet the definition of a stationary source under the Clean Air Act? Show all work.

 

[Guest]

102. A jet aircraft operating at full throttle burns JP4 jet fuel at a rate of 54 lbs / min. If the aircraft is positioned on a conveyor belt that is moving in the opposite direction, but at the same identical speed, would the aircraft meet the definition of a stationary source under the Clean Air Act? Show all work.

Assuming the laws of physics act like this ----> , you look pretty stationary to me :laugh:

54 lb/min * (1440 min/1 day) * (365 d/1 yr) = 28,382,400 lbs/yr >>> 5,000 lbs/yr therefore it would require Title V permitting under the CAA.

What do I win ?? B)

JR

 

[Dleg]

Wait a minute there, partner. I think you're overlooking some of the basic principles of thrust and aerodynamics. That baby would be flying!

 

[RIP - VTEnviro]

102. A jet aircraft operating at full throttle burns JP4 jet fuel at a rate of 54 lbs / min. If the aircraft is positioned on a conveyor belt that is moving in the opposite direction, but at the same identical speed, would the aircraft meet the definition of a stationary source under the Clean Air Act? Show all work.

Are we neglecting friction? What's the air-to-fuel mixture? What's the in-flight movie?

 

[FLBuff PE]

Are we neglecting friction? What's the air-to-fuel mixture? What's the in-flight movie?

Why, Airplane, of course!