A reactive chemical disposed of by dilution dissipates at a uniform rate of 0.15mg/l per hour.The waste discharge is 7 million gallons per day containing 35 mg/l,while the stream has zero concentration with a flow above sewer outfall of 102ft^3. If the mean velocity in the river is 0.8ft/s.calculate the distance down stream that the chemical residue persists
A reactive chemical disposed of by dilution dissipates at a uniform rate of 0.15mg/l per hour.The waste discharge is 7 million gallons per day containing 35 mg/l,while the stream has zero concentration with a flow above sewer outfall of 102ft^3. If the mean velocity in the river is 0.8ft/s.calculate the distance down stream that the chemical residue persists
The distance down stream that the chemical residue persists is to be calculated.
The distance required is given as,
....... (1)
d = Distance required
v = Mean velocity in river
t =Time for waste dissipation
Let water discharge flow rate = Q. In the MKS units it is given as,
The chemical concentration of the diluted wastewater mixture is given as,
....... (2)
The notations used in equation (2) are,
CW = Chemical concentration of the diluted mixture of wastewater
C1 = Stream concentration
C2 = Wastewater concentration
Q1 = Flow rate of the stream
Q2 = Flow rate of the discharge water = Q
The data given is,
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