Engineering, 06.05.2020 05:43 xojade
Wastewater from a primary treatment tank is to undergo secondary treatment in an activated sludge unit. The following data and operational parameters are specified: Parameter Value Description MLVSS 3000 mgVSS/L Biomass concentration in the aeration basin μmax 1 d-1 Maximum specific BOD degradation rate kd 0.08 d-1 Cell decay rate Ks 35 mg/L Half-saturation constant Y 0.5 gVSS/gBOD Theoretical yield So 300 mg/L Initial substrate concentration Qw 10 m3/d Flow rate of waste stream Xe 10 mg/L VSS concentration at the exit stream The wastewater flow rate is 1000 m3/d, and the BOD5 of the effluent suspended solids is 80% of the allowable concentration by EPA's secondary treatment standards (30 mg/L). The MLVSS/MLSS ratio is 0.7. (a) Determine the solid retention time (units: days)
Answers: 3
Engineering, 04.07.2019 18:10
Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.
Answers: 1
Engineering, 04.07.2019 18:10
Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k
Answers: 2
Engineering, 04.07.2019 18:10
True or false (explain) (110)[111] is a slip system in bcc metals . the {111} family in fcc contains 8 planes. resolved shear stress (rss) in single crystals is just related to the applied stress. critical resolved shear stress (crss) in single crystal metals is direct proportional to the number of defects in the structure
Answers: 2
Engineering, 04.07.2019 18:10
What are the two (02) benefits, which may result from a successful implementation of preventive maintenance (pm) program in an organization? (clo3)a)- lean manufacturing b)-overlapping responsibilities c)-the planner is not qualified d)-accurate contractor information e)-reduction in equipment redundancies f)-accurate stores information
Answers: 3
Wastewater from a primary treatment tank is to undergo secondary treatment in an activated sludge un...
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