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25 mg chemical Y (log kow = 2.88) is added to a microcosm (i.e., tank) that contains 1 kg soil, 20 L water. Chemical Y has negligible volatility (very low partitioning to air). The soil is mized with water for several days until equilibrium (between the chemical concentration on the soil and in the water) is reached.
If the soil contains 2% organic carbon and it can be assumed that koc=0.5*kow
What is the concentration of the chemical in the water (mg/L), and in the soil (mg/kg)?
A concrete sidewalk slab is 17.5 MPa, 4 inches deep, and 2 m long. A tree root has pushed it up so there is a 1 inch lip at the junction with the adjacent slab, and the slab is effectively 1 inch above its base underneath
a poorly designed 100 ft long homogeneous barge runs on diesel fuel, the fuel is held in a 2' tall trapezoidal tank of the same length as the barge. and is located at the bottom of the barge hull.
a horizontal curve on a single-lane highway has its PC at station 124 + 10 and its PI at station 131 + 40. The curve has a superelvation of 0.06 ft/ft and is designed for 70 mi/h. What is the station of the PT?
A dye mill has a highly coloured wastewater with a flow of 32 million L/day. One suggestion has been to use biological measn to treat the watewater and remove the colour, so a pilot study is performed.
The van leaves as soon as 6 people have arrived. On average, 24 passengers arrive each hour. What is the probability that the period between bus department is more than 15 minutes.
a circular steel tube of length L=1.2m is loaded in torsion. If the inner radius of the tube is 45 mm and the measured angle of twist between the ends is 0.4 degrees, what is the shear strain at the inner surface
Compute the maximum service load (25% dead and 75% live) acceptable for a structural tee WT12x38 when used in a truss location where it is braced in the plane of the truss at 20 ft intervals and braced transverse to the plane of the truss at 10 ft..
find the maximum allowable force P if the maximum allowable bearing stress on 6 pins holding 2plates together is σ all=10 MPa, and the maximum allowable shear stress is τ all =25 MPa
the casting has a mass of 3 mg. suspended in a vertical position and initially at rest it is given an upward speed of v
Lab studies have shown that the rate constant associated with the process are as follows: k = 0.95 mg COD/mg VSS-day; Y = 0.48 mg VSS/ mg COD, half-saturation K = 85 mg COD/L; ke = 0.07 d-1.
The aquifer characteristics are: Ambient temperature=8 oC Hydraulic conductivity = 123 ft/day Hydraulic gradient = 0.00091 ft/ft Effective porosity = 0.31 Total organic carbon = 198 mg/kg Bulk density = 1.65 g/cm3
Consider a state with a total water withdrawal of 4.5 bgd in 2000. This was distributed as follows: municipal use 1.0 bgd, industrial use 1.5 bgd, and steam electric cooling 2.0 bgd. Assume a 2000 Population of 10 million and a projection of 12 mi..
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