A BNR facility is designed for a flow of 8500 m-/d. The influent TP is 5.5 mg/L, and required effluent TP concentration is less than 1 mg/L. The BOD3 in influent is 150 mg/L, and the ratio of BOD5/COD is 0.48. Calculate the achievable TP in the effluent and minimum volume of the anaerobic zone. Assume TSS in effluent is 10 mg/L or less, the TVSS/TSS ratio is 0.8, and the representative chemical formula for the VSS portion of biomass is C60H87023N12P.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.