Engineering Board Exam Reviewer · Environmental Engineering · hard
Using the Deutsch–Anderson equation = 1 - (-wA/Q), what is the efficiency of an electrostatic precipitator with plate area 5000 m2, gas flow 50 m3/s and drift velocity 0.1 m/s?
- 99.995%
- 0.10%
- 10%
- 90.000%
Answer
A. 99.995%
Solution
= 1 - (-0.1 × 5000/50) = 1 - e-10 = 99.995%.
More Environmental Engineering questions
- A cyclone (80% efficient) is followed by an electrostatic precipitator (99% efficient) in series. What is the overall particulate…
- A stack discharges 50 m3/s of flue gas containing 200 mg/m3 of particulates. What is the particulate emission rate?
- A CO concentration is 10 mg/m3 at 25 °C and 1 atm. What is it in ppm? (M CO = 28 g/mol, molar volume = 24.45 L)
- Convert an SO2 concentration of 0.1 ppm to g/m3 at 25 °C and 1 atm. (M SO2 = 64 g/mol, molar volume = 24.45 L)
- Using the rational method Q = 0.278CiA (Q in m3/s, i in mm/h, A in km2), what is the peak runoff from a 2 km2 urban catchment with C = 0.6…
- The total hardness of water is 250 mg/L as CaCO₃ and the alkalinity is 180 mg/L as CaCO₃. What is the noncarbonate (permanent) hardness?
- Using Stokes' law, what is the settling velocity of a discrete particle 0.05 mm in diameter with a density of 2650 kg/m3 in water at 20 °…
- An activated sludge system has a 2500 m3 aeration tank with an MLSS of 3000 mg/L. Waste sludge is removed at 50 m3/day with a solids…
- An aeration tank of 2500 m3 receives 10,000 m3/day of wastewater. What is its hydraulic retention time?
- An activated sludge aeration tank of 2500 m3 treats 10,000 m3/day of wastewater with a BOD of 200 mg/L. The MLVSS is 3000 mg/L. What is…