A fine-bubble aeration basin has a flow of 21.5 mgd, an influent BOD of 180 mg/l, 31 mg/l of mmonia, and effluent of 10 mg/l. During the winter, the wastewater temperature of 14.8 degrees C does not nitrify. During the summer , wastewater temperatures increase to 18.5 degrees C and operators cannot avoid nitirification. The residual DO is controlled to maintain 2.0 mg/l. Diffusers are 15 ft deep. use average oxygen transfer values for (alpha)F and (beta). Calculate (1) winter and (2) summer values for oxygen demand, oxygen tranfer, hp, and airflow rate.

Determine the final kinetic energy of the system : A student on a piano stool rotates freely with an angular speed of 3.05rev/s . The student holds a 1.45kg mass in each outstretched arm, 0.779m from the axis of rotation. Calculate the final kinetic energy of the system |

Determine the design flow for the conduit : An intake conduit from a well field used to pump ground water is being designed for a town with a population of 23,000 people. Six years ago the population was 21,500 people. a) assuming deometric growth, calculate the population in 50 years |

Explain solution boiled to remove co2 and then the excess : Solution boiled to remove CO2 and then the excess HClO4 back titrated with 13mL of dilute NaOH. In a seperate experiment 18.44 mL of HClO4 neutralized NaOH in a 16.0 mL portion. Calculate molarities of HClO4 and NaOH |

What is the final angular speed of the merry-go-round : A disk-shaped merry-go-round of radius 2.73m and mass 185kg rotates freely with an angular speed of 0.681rev/s. What is the final angular speed of the merry-go-round |

Find summer values for oxygen tranfer-hp and airflow rate : A fine-bubble aeration basin has a flow of 21.5 mgd, an influent BOD of 180 mg/l, 31 mg/l of mmonia, and effluent of 10 mg/l. During the winter, the wastewater temperature of 14.8 degrees C does not nitrify. |

Explain a perfect gas has a constant volume molar heat : A perfect gas has a constant volume molar heat capacity of CV,m = 1.5× R, and a constant pressure molar heat capacity of Cp,m = 2.5× R. For the process of heating 4.50 mol of this gas with a 12 W heater for 400 seconds, calculate |

Discuss the most important challenges of financial sector : Discuss the most important challenges of the financial sector. Defend whether you think regulatory changes are imperative. If yes, recommend changes. If no, justify your opinion. |

Find the outlet humidity ratio : Air at 1 atm, 36C, 20% relative humidity enters an evaporative cooler at 4 m^3/min. find the outlet humidity ratio |

Prepare a multiple-step income statement : Prepare a multiple-step income statement combined with a reconciliation of retained earnings for the year ended December 31, 2008. |

## Determine the magnitudes of the components faa and fbbForce F with magnitude indicated acts at point o. determine the magnitudes of the components Faa and Fbb along directions a-a and b-b so that F=Faa+Fbb |

## Annual worth of the projectUse microsoft excel functions to find the net present worth of the project, and the internal rate of return,and the annual worth of the project? |

## Write a mass balance equation for this chemicalAn industrial plant presently discharges a chemical (W=2000 * 106 gr/yr) to the lake. In addition, the inflow stream also contains the same chemical at a concentration of 15 mg/L. Note that the volumetric inflow and outflow are equal. |

## How kinematic and diffusion wave model been usedhow kinematic and diffusion wave model been used for rainfall runoff modelling. main computer programme involved. |

## Required to dewater a construction siteIt is required to dewater a construction site 80 m by 80 m. The bottom of the construction will be 1.5 m below the initial water surface elevation of 90 m. |

## Find what is the annual crash rate for the intersectionThe four approach volumes per day at this intersection are 28,648, 23,856, 12,150, and 10,174. The crash totals for the last 3 years are 91, 96, and 87. What is the annual crash rate for this intersection |

## How to determine the npv and the profitability indexA four year financial project has net cash flows of $20,000; $25,000; $30,000; and $50,000 in the next four years. It will cost $75,000 to implement the project. If required rate of return is 20%, conduct a discounted cashflow calculation |

## Calculate the temperature of the air in fahrenheitThe "sea-level adjusted" pressure at the airport was about 30.57 inches of mercury. Assuming the density of air is 1.30 kg/m3 and the gas constant for air is 287. J/(kg K), calculate the temperature of the air in Fahrenheit. |

## What is the spring constantsuppose you apply a force of 14.4 N to a spring and it stretches 2.4 cm. what is the spring constant? |

## Determine the constants sigma0 and k in the hall petchdetermine the constants sigma0 and k in the Hall petch equation of 70-30 brass sample. |

## Latent heat of fusion problemWhat mass (in grams) of steam at 100°C must be mixed with 387 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 26.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, .. |

## At what temperature does the liquid solidifyWhat is the composition of this last remaining liquid phase? |

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