1.Facultative stabilization ponds with a total surface area of 6.0 ha serve a community with a waste discharge of 530 m cubed/d at a BOD of 280 mg/l. Calculate the BOD loading and days of winter storage available between the 0.6 and 1.5 m depths, assuming a daily water loss of 0.30 cm by evaporation and seepage.

2.State the two main reasons why an activated sludge system is operated at a relatively low food/microorganism ratio

The rate of entropy generation in the surroundings is : Steam at 500 kPa and 200 C is mixed adiabatically with cold water at the same pressure and 15 C to produce 1 kg/s saturated liquid water at 500 kPa. The rate of entropy generation in the surroundings is? in kw/K |

Why is compliance with international trade laws important : You have been asked to study the issues involved in getting your company totally in compliance with international rules and regulations governing overseas trade. Why is compliance with international trade laws important? |

Discussion questions for damien duff''s personal financial : Discussion Questions for Damien Duff's personal financial plan |

Compile an annotated bibliography of 40 entries : Compile an Annotated Bibliography of 40 entries |

Calculate the bod loading and days of winter storage avail : Facultative stabilization ponds with a total surface area of 6.0 ha serve a community with a waste discharge of 530 m cubed/d at a BOD of 280 mg/l. |

Compute the land area required for land disposal : Calculate the surface area required for a stabilization pond to serve a domestic population of 1000. Assume 80 gpcd at 210 mg/l of BOD. Use a design loading of 20 lb of BOD/acre/day. |

Determine the activated sludge aeration volume required : Determine the activated sludge aeration volume required to treat 2.64 mgd with a BOD of 120 mg/l based on the criteria of a maximum BOD loading of 40 lb/1000 ft cubed/day and a minimum aeration period |

What is the aeration time for an f/m of 0.35 : Determine the volume of three identical activated sludge tanks following primary clarification to aerate 36,000 m cubed/d with a BOD concentration of 180 mg/l at a BOD loading of 560 g/m cubed*d. |

Design speed station of the pc station of the pt deflection : A horizontal Curve is designed for a two lane mountainous terrain. The following data are known. intersection angle: 40 degrees tangent length: 436.76 ft Station on PI: 2700+10.65 fs=0.12 e=0.08 |

## Find specific mechanical energy and power available in windThe air pressure is taken to be 80kPa and the mean annual temperature is 2 degrees Celsius. What are the specific mechanical energy and power available in thw wind that a wind turbine with 60m diameter blades might be able to harvest |

## How long does it take to drain the tank to 50A cylindrical tank 5-m in diameter is filled with water to 3-m depth. A very short horizontal pipe with 20-cm diameter and rotary valve is used to drain the tank from the bottom. How long does it take to drain the tank to 50%? |

## What does that mean in terms of remaining and removalSuppose you are told that a process must achieve a 2.7 log removal of Giardia cysts. What does that mean in terms of % remaining and % removal |

## A particle travels along a straight line with anbspvelocitya particle travels along a straight line with anbspvelocity v 12-3t2 ms where t is in seconds.nbspwhen t 1 s the |

## What is minimum distance from stalled car before hittingA driver is traveling 68 mi/h on a road with a -3% grade. There is a stalled car on the road 1000 ft ahead of the driver. The driver's vehicle has a braking efficiency of 90% and anti-lock brakes. |

## Calculate temperature of the air at the exit of the nozzleAssuming that the nozzle is well insulated and operating at steady state and that the air behaves as an ideal gas, calculate (a) the mass flow rate of air in kg/s, (b) the exit area of the nozzle in m^2, |

## Calculate the elevations at the vpc-vpt and high pointA 2000-ft vertical curve connects a +3% grade to a -5% grade. If the vertical tangents intersect at sta. 52 + 60.55 and elevation 877.62 ft, calculate the elevations at the VPC, VPT, high point, and sta. 54 + 00. |

## How to determine the friction force on the floorThe crate has a wieght of W = 350lb., and the coefficients of static and kinetic friction are us = 0.3 and uk = 0, respectively. Determine the friction force on the floor. Theta = 45 degrees and P = 100lb. |

## Generate a table of conversions from degrees to radiansGenerate a table of conversions from degrees to radians. The first line should contain the value for 0 degrees and last line should contain the value for 360 degrees. allow user to enter the increment to use between the lines in the table |

## Determine the average velocity for the portion of the flowAn in-compressible fluid flows horizontally in the x-y plane with a velocity given by u = 33 (y/h)^1/2 , where y and h are in meters and h is a constant. Determine the average velocity for the portion of the flow between y = 0 and y =h. |

## What is the delfection due to self weight at the end of beamA 13 foot long C10x25 beam is supported as a cantilever beam where x=0 on the left end. It is subject to no externally applied loads. a) What is the delfection due to self weight at the end of the beam |

## Estimate the dimensions of the bio filter needed to treatIt has been reported that a peat biofilter treating styrene had a maximum elimination capacity of 100 g/m^3-hr,and a critical load of between 60-75 g/m^3-hr. Further investigation reveals that a 97% efficiency was acheived at a load 40 g/m^3-hr. |

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