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A 150-mL sample from a lake was used to determine TSS. A rinsed and dried filter weighed 0.3588 grams before the sample was filtered and then weighed 0.3630 grams after the sample was filtered and being at dried at 103C. What is the TSS for this sample?
{rm Al} reacts with 4.45 {rm g} of {rm O}_{2}, what is the empirical formula of aluminum oxide?
Consider a rectangular wastewater treatment cell having a length of 100ft, width of 20ft and depth of 20ft. If the flow into the cell is 50ft^3/min, calculate the residence time of the treatment cell.
Calcium sulfate (CaSO4, solubility product Ksp=2*10^-5 M^2), is added to initially pure water, such that solid CaSO4 remains at equilibrium. (Assume the sulfate does not participate in reaction other than the solubility product; no HSO4- formed).
A drinking water treatment plant will be designed to process a flow of 15,000 m3/d. The sedimentation tank will have a residence (detention) time of 4 hours and the overflow rate (Q/A) of 16 m 3 /m 2 -day. Estimate the required surface area (A), an..
What is the maximum load that a .75" diameter steel cable can hold if the UTS of the steel is 145,000 PSI and a safety factor of 1.5 is required.What is the stretch of the 360" cable under this load
The curve is to be redesigned for a 70 mph design speed in the year of 2025. Vehicle braking technology has advanced so that the recommended design deceleration rate is 25% greater that the 2011 value used to develop
A laptop has a four year life span with an initial cost of $900 and $100 salvage value. According to the straight line method what is the depreciation charges you expect on the laptop
The mass m, stiffness k, and natural frequency fn of an undamped SDF system are unknown. These properties are to be determined by harmonic excitation tests. at an excitation frequency of 4 Hz, the response tends to increase without bound.
The machine part ABC is supported by a frictionless hinge at B and a wedge at C. Knowing that the coefficient of static friction is 0.20 at both surfaces of the wedge, determine:
An activated sludge process receives 4000m^3 / day containing 120 mg BOD /L from the primary settling tank and 3500 m^3/day Containing 25mg BOD/L from the secondary settling tank.
A tray rests on an extendible arm consisting of two steel tubes with two different outer diameters. The downward force at the tray center F0 = 1000 N. Determine the downward deflection of the tray center and the tilt angles of the tray about each ..
A before-and after speed study was conducted to determine the effectiveness of a series of rumble strips installed approaching a toll plaza to reduce approach speeds to 40 mi/h.
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