6. A well-mixed flow reactor (CSTR) containing water is open to the atmosphere. The inlet flow stream contains BOD and dissolved oxygen (DO). Within the reactor, the BOD and DO undergo this reaction: BOD+DOproducts The reaction is first order in BOD and zeroth order in DO, provided the DO content of the water exceeds 0.1gm3. Since the reactor the reactor is open to the atmosphere, interfacial mass transfer occurs, replenishing the depleted oxygen. Solve for the steady-state DO concentration in the reactor