A train of four 55-gallon cannisters of activated carbon is to be used to reduce the nitroglycerine (NG) content of 400 gph of wastewater from 2,000 ppm by weight to less than 1 ppm. Each cannister has a diameter of 2 ft and holds 200 lb activated carbon (ρb = 32 lb/ ft3 ). Each cannister is also equipped with a liquid-flow distributor to promote plug flow through the bed. The effluent from the first cannister is monitored so that when a 1-ppm threshold of NG is reached, that cannister is removed from the train and a fresh cannister is added to the end of the train. The spent carbon is mixed with coal for use as a fuel in a coal-fired power plant at the process site. Using the following pilot-plant data, estimate how many $700 cannisters are needed each month and the monthly cost. Pilot-plant data: Tests with the 55-gallon cannister used in the commercial process: water rate ¼ 10 gpm; NG content in feed ¼ 1,020 ppm by weight. Breakthrough correlation: tB =3.90 L -2.05, where tB - time, h, at breakthrough of the 1-ppm threshold and L = bed depth of carbon in ft.
A train of four 55-gallon cannisters of activated carbon is to be used to reduce the nitroglycerine (NG) content of 400 gph of wastewater from 2,000 ppm by weight to less than 1 ppm. Each cannister has a diameter of 2 ft and holds 200 lb activated carbon (ρb = 32 lb/ ft3 ). Each cannister is also equipped with a liquid-flow distributor to promote plug flow through the bed. The effluent from the first cannister is monitored so that when a 1-ppm threshold of NG is reached, that cannister is removed from the train and a fresh cannister is added to the end of the train. The spent carbon is mixed with coal for use as a fuel in a coal-fired power plant at the process site. Using the following pilot-plant data, estimate how many $700 cannisters are needed each month and the monthly cost. Pilot-plant data: Tests with the 55-gallon cannister used in the commercial process: water rate ¼ 10 gpm; NG content in feed ¼ 1,020 ppm by weight. Breakthrough correlation: tB =3.90 L -2.05, where tB - time, h, at breakthrough of the 1-ppm threshold and L = bed depth of carbon in ft.
Trending now
This is a popular solution!
Step by step
Solved in 5 steps with 7 images
