There are two streams that come together. a dairy farmer decides he wants to farm where they come together but needs to get rid of the excess manure. a pipe to the stream is his answer. you have the following situation: do (mg/l) flow volume m^3/s) | flow stream 1 stream 2 cafo dairy 7.8 bods (mg/l) 15 2 1970 tempo 3 3.7 35 11 7 2 0. 1 the decay constant is 0.2. the river is 2.5 m deep and has a flow velocity of 0.2 m/s a. diagram the problem? b. what is the do of the combined flow? c. what is the temperature of the combined flow? d. what is the do saturation value of the combined flow? e. what is the bods of the combined flow? 1. what is the ultimate bod for the combined flow? & what is the reaeration constant? h. what is the critical time for do? what is the do at the time critical? draw the curve (roughly o you know 2 points on it) k. how far downstream does the critical do occur? assuming the do cannot be below 5 mg/l, and everything is the same except the cafo discharge, what should the cafo discharge be? (3 points) 2. 19 pts) assume you have a coalfired plant that produces 300 mw. the plant is 30% efficient. there is 0.2 lbs of sulfur produced per btu. there is 5 residual ash created. assume you live 4 km downstream o the plant. it is a cloudy summer night with a wind of 2.5 m/s. the effective stack height is 100 m. a. what is the feed rate of coal to the plant (lbs per hour)? b. how much sulfur is produced per hour? c. what is the concentration of sulfurat your house? 12 pts) -- list all assumptions you usel d. assume the concentration is too high, what should you do? e. how much ash is produced per day? if you have decide to build an ash landfill that can hold 25 years worth of ash at the current rate of production, and the coal ash density is 100lbs/cy, how many cubic yards of landfill space must be created? (2 pts) b. at a cost of $50 per ton of excavation, how much will the landfill excavation cost? 3. 15 pts) assume to doi of a bod sample is 5.6 mg/l you come back 5 days later and the dos 32 mg/l. what is the bods? if the decay constant is 0.18/d, what is the ultimate bod? booz? 800107 graph the result. 4. (2 pts) assume the growth rate of an organism is exponential and the rate is 0.2/hr. if you start with 100 cfu/l, how many will you have in 2 days? 5 days?