Engineering, 19.02.2020 22:49 amanda2517
Sewage is being treated in two aerated lagoons in series. Each lagoon has a surface area of 5 hectares (ha) and depth of 1 m, and each operates as a CSTR at steadystate. The influent to the first lagoon contains 100 mg/L of biodegradable organic material in a flow of 8640 m3/d. At steady-state, the effluent from the second lagoon must contain no more than 20 mg/L of the organics. What first-order biodegradation rate constant must be reached to achieve the treatment goal?
Answers: 1
Engineering, 04.07.2019 18:10
Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.
Answers: 2
Engineering, 04.07.2019 18:10
Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?
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Engineering, 04.07.2019 18:10
Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan
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Engineering, 04.07.2019 18:20
Have a greater impact on maintenance productivity than any other support group. (clo5) a)-the top management b)-inventory and purchasing c)-sub-contracting d)-cmms
Answers: 2
Sewage is being treated in two aerated lagoons in series. Each lagoon has a surface area of 5 hectar...
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