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The NAAQs for particulate matter less than 10 microns (PM10) are an annual average concentration of 50 mg/m3 and a daily maximum of 150 mg/m3. For the region surrounding the city of Middleburgh, the typical background concentration of PM10 is 30mg/m3. The city has dimensions of 75 km x 75 km and an atmosphere mixing height of 900 m in the region.
(a) Estimate the steady state PM10 concentration assuming a PM10 deposition velocity of 0.12 cm/s, prevailing wind velocity of 2.5 m/s, and a constant emission flux of PM10 0.82 mg/m2-s.
(b) For a few days each year meteorological conditions drop the mixing height to 250m and wind speed to 0.8 m/s. Assuming the emission rate remains constant and unchanged during this period, estimate how long it will take before the daily maximum NAAQS for PM10 is exceeded.
Use the Bernoulli equation to describe how this manometer can be used to measure the flow rate through the meter.
As a project manager on site where work for 3 km long tunnel has been undertaken the site is remote and takes about 2 days to travel to nearest town supervisors technicians and skiled workers in dangerous work.
Oil of a specific gravity of 0.75 is flowing through a 6-in pipe under a pressure of 15 psi. If the total energy relative to the datumplate is 8.0 ft below the center of the pipe is 58.6 ft, determine the flow rate of the oil.
Determine the slenderness ratio of a 5 m column with built in ends if its cross- section is (a) circular with a radius of 40mm and (b) 50 mm square. Use the concept of effective length.
Ethylene diamine tetra-acetic acid (EDTA) is a water-soluble compound that readily combines with metals, such as calcium, magnesium, and iron. The molecular formula for EDTA is C10N2O8H16. Assume one EDTA molecule complexes (associates with) one m..
An increment of vertical stress of150kpa compress the sample to a void ratio of1.43. What is the over consolidation ratio of the soil at the unloaded condition.
A rectangular concrete channel is 3 m wide and 2 m high. The water 20 deg Celsius in the main channel is 1.5 m deep and is flowing at a rate of 30 m^3/s. determine the flow area, wetted perimeter, and hydraulic radius. Is the flow laminar or turbu..
A Biodegradable industrial wastewater (paper production) has a COD of 600 mg/L. If the BOD progression follows first-order kinetics with a rate constant = 0.10 per day, determine the BOD.
Estimate the median and 90th percentile load of SS contained in the runoff. Note: COV = coefficient of variance
Carbon disulfide (CS2) reacts with excess chlorine (Cl2) to produce carbon tetrachloride (CCl4) and disulfur dichloride (S2Cl2). If 69.7 g of CS2 yields 62.6 g of CCl4, what is the percent yield? (Hint, you must first write the balanced equation.)
Calculate the water/cement ratio of the cement paste in which all the cement will hydrate to leave no capillary pores. (density of cement: 3.1 g/cm3) ?
The condenser in a refrigerator receives R-134a at 700 kPa and 50C, and it exits as saturated liquid at 25 C, The flow rate is 0.1 kg/s,and the condenser has air in at an ambient temperature of 15 C and leaving at 35 C. Find the minimum flow rate ..
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