Question

As an environmental engineer, you have been selected to design a secondary wastewater treatment plant for your town of 15000 people which also has some industry that discharges wastewater to the plant. The average daily wastewater flow is 2.1 MGD. If the If the average domestic per capita sewage flow is 100 gpcd, what is the average flow of the industrial wastewater (in MGD)? *

Answer 1

Ans) According to question,

Average daily waste water flow = Domestic wastewater flow + Industrial wastewater flow

Given,

Average daily waste water flow = 2.1 MGD or 2.1 x gal/day

Per capita waste water flow = 100 gal/capita-day

Number of person = 15000

=> Domestic wastewater flow = 100 gal /capita-day x 15000 = 1.5 x gal/day

Hence, putting values,

=> (2.1 x ) = (1.5 x ) + Industrial wastewater flow

=> Industrial wastewater flow = (2.1 - 1.5) x gal/day = 0.6 x gal/day or 0.6 MGD

Therefore, average Industrial wastewater flow is 0.60 MGD