(2 points) a perfectly mixed aeration pond with no recycle serves as the biological reactor for a small community. the pond receives 30 m3 /d of influent with a bod of 350 mg/l that must be reduced to 20 mg/l before discharge. it has been found that the kinetic constants for this system are: ks = 100 mg bod/l, kd = 0.10 day-1 , μm = 1.6 day-1 , y = 0.60 mg ss/mg bod. assume xo = 0. a. what must the hydraulic retention time (θ = v/q) be in the aeration pond? b. what mass of microbes will be produced in the pond each day?

a)  t = 165 days

b) 9.9 kg/day

Explanation:

Given data:

final lelvel of BOD is 20 mg/l

Ks = 100 mg BOD/L,

kd = 0.10 day-1 ,

μm = 1.6 day-1 ,

Y = 0.60 mg SS/mg BOD

a) we know that

solving for t

t  =  165 days

b) mass of microbes

the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only

import math

x=int(input("enter a number: "))

print (math.sqrt(math.fabs(