Reference no: EM132428388

Environmental Engineering - Korea University

Report About CSTR and PFR Aystem for Environmental Engineering

1. Mass Conservation Law

If you have to explain what the mass conservation law is and its significance in environmental engineering to your friend who studies Korean literature, what's going to be your answer? (Limit your answer in one page).

2. Mass Balance, CSTR

2.1 Can you get the equation for the C_out in non-steady state and steady state with first order reaction?

From the <Advanced Engineering Mathematics>
Linear Differential equation of y′ + p(x)y = r(x)
Homogeneous: r(x) = 0, y(x) = ce^-∫p(x)dx
Heterogeneous: r(x) ≠ 0, y(x) = e^-h [∫ e^hrdx + C], h = ∫ p(x)dx

2.2 The CSTR is used with a conservative substance. The reactor is filled with clean water before it is started. After starting, waste containing a 100 mg/L of a pollutant is added at a flow rate of 50 m3 /day. The volume of the reactor is 500 m3. What is the concentration exiting the reactor as a function of time after it is started?

2.3 Again, the CSTR is used to treat an industrial waste, using a reaction which destroys the waste according to first-order kinetics: where k=0.216/day. The reactor volume is 500m3, the volumetric flow rate of the single inlet and exit is 50 m3/day, and the inlet waste concentration is 100 mg/L. What is the outlet concentration?