Two towns, located directly across from each other, operate municipal wastewater
ID: 1827932 • Letter: T
Question
Two towns,
located directly across from each other, operate municipal wastewater treatment
plants situated along a river. The river flow is 50 million gal. per day (50
MGD). Coliform counts are used as a measure to determine a water%u2019s ability to
transmit disease to humans. The coliform count in the river upstream of the two
treatment plants is 3 coliforms/100 mL. Town 1 discharges 3 MGD of wastewater
with a coliform count of 50 coliforms/100 mL, and town 2 discharges 10 MGD of
wastewater with a coliform count of 20 coliforms/100 mL. Assume the state
requires the downstream coliform count not exceed 5 coliforms/100 mL.
a) Is the
state water-quality standard being met downstream? (Assume coliforms do not die
by the time they are measured downstream.)
b) If the
state standard downstream is not met, the state has informed town 1 that it
must treat its sewage further so the downstream standard is met. Use a mass
balance approach to show that the state%u2019s request is unfeasible.
Explanation / Answer
a)Yes the stste water quality standard being met downstream because coliforms does not die and they are enough to maintain the standard and to make the water downstream free from the diseases.!!!
b) Coliform in the upstream= 50 coliform/100 mL
The treatment provided in upstream is more than required and so that these don't die in downstream and again they are treated in downstream
Mass balance=
INPUT=OUTPUT+ACCUMULATION
So when Input is large and sufficent then how can be output not feasible.!!
SO the request provide by state is unfeasible.!!!
Plz.. do rate my answer with 5 star ratings..!!!
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