4. A municipal wastewater-treatment plant receives a seasonal discharge from a f
ID: 231153 • Letter: 4
Question
4. A municipal wastewater-treatment plant receives a seasonal discharge from a fruit processing plant. Influent flows and strengths of the wastewater when the industry is both on- and off-line are given below. Determine the contribution of each constituent by the industry.
Parameter
Industry on-line
Industry off-line
Flow, m3/d
18,750
13,275
BOD5, mg/L
300
215
SS, mg/L
420
240
Ammonia, mg/L
64
15
Chloride, mg/L
29
41
Alkalinity, mg/L
57
125
Parameter
Industry on-line
Industry off-line
Flow, m3/d
18,750
13,275
BOD5, mg/L
300
215
SS, mg/L
420
240
Ammonia, mg/L
64
15
Chloride, mg/L
29
41
Alkalinity, mg/L
57
125
Explanation / Answer
The contribution of each constituent by the industry is equal to the difference between Industry on-line and Industry off-line.
(i)
Contribution of Flow in m^/d = 18750 - 13275
= 5475
(ii)
Contribution of BOD5 in mg/L = 300 - 215
= 85
(iii)
Contribution of SS in mg/L = 420 - 240
= 180
(iv)
Contribution of Ammonia in mg/L = 64 - 15
= 49
(v)
Contribution of chloride in mg/L = 29 - 41
= - ve number
As the contribution can't be negative, it can be concluded that the contribution of chloride in mg/L is equal to zero.
(vi)
Contribution of alkalinity in mg/L = 57 - 125
= - ve number
As the contribution can't be negative, it can be concluded that the contribution of alkalinity in mg/L is equal to zero.
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