You place a 20 g sample of solid waste in a drying oven overnight and find the mass in the morning (after the moisture has been evaporated) to be 16.2 g. A 1 g (wet) sample is also placed in a 1L water jacket bomb calorimeter and 0.18 g of ash remains in the sample cup after combustion. The temperature in the calorimeter is raised by 2.17 ˚C. Calculate the heat value on a wet weight basis, dry weight basis, and on a moisture and ash-free basis. Convert your values to BTU/lb

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2. Families in a community in a developing country use large, 200.0 L drums to un-treated surface water. You are designing a device that is designed to dose the volume with a coagulant, stir to allow flocculation, then add chlorine tablets to disinfect the water. The water is 25 °C and initially contains 1.0E+09 particles per L. The initial particles can be assumed to be spherical, 15.0 micrometers in diameter, and with a density of 1.675 g/mL. a. If the drums have a diameter of 572 mm, how long will it take for the particles to completely settle without any coagulation or flocculation? (answer in seconds) You have determined that you can achieve complete destabilization of particles by achieving an ionic strength of 0.01 M or higher. If you use alum (Al2(SO4)3) as a coagulating agent, what mass of alum must be added per batch of 200 L? (answer in grams) How many joules of energy would be required to stir the drum at a mixing intensity of 150 s-' for 20 minutes? If the drum is stirred…

A filter is designed with the following specifications. The anthracite and sand have densities of 1700 and 2650 kg/m3, respectively, and the design temperature is 10 oC. For the given sample, calculate the clean-bed head loss. Bed Type Dual Media Filtration Rate 10 m/h Anthracite Effective Size 1.2 mm Anthracite Depth 1.4 m Sand Effective Size 0.55 mm Sand Depth 0.4 m