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. What is the aeration time? For an F/M of 0.35, what MLSS concentration should be maintained in the aeration tanks?

Estimate the operating sludge age, assuming an effluent suspended solids of 30 mg/l and the daily amount of waste activated sludge solids. If the waste sludge has a concentration of 10000 mg/l, what is the calculated volume of sludge to be wasted each day?

Determine the dimensions of three identical rectangular clarifiers (length, width, and side water depth) with a 2:1 length to width ratio.

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 |

What is the trains velocity and what is its displacement : Suppose that the acceleration of the train during the interval time from t=2 to t=4 s is a 2t m/s^2, and at t = 2 s its velocity is v = 180 km/hr. What is the train's velocity at t = 4 s, and what is its displacement (change in position) from t = 2 s.. |

Figure if the authorities intend to spend exactly : Foxton village is 10 miles north of an abandoned road that goes from east to west grimley leaving. POINT OF abandoned road closest to Foston is 40 miles from grimley County authorities are to build a new road linking |

What is the 95% confidence interval and the standard : Suppose we want to estimate the average weight of adult males in greater metropolitan Atlanta area. We draw a random sample of 1,000 men from a population of 1,000,000 men and weigh them. We find that the average man in our sample weighs 180 pounds, .. |

## Commercial management in civil engineering 1-criticallycommercial management in civil engineering 1-critically analyse the use of project related commercial risk registers |

## What thickness of bc will result in same compressive stressA second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB= 1.25 in, tAB= 0.5 in, dBC= 2.25 in and tBC= .375 in respectively. |

## Find the stress induced in the aluminum rodFind the stress induced in the aluminum rod if, after the gap is closed, the two segments are welded together, and then a leftward force is applied of the same magnitude needed to close the gap. Assume the rod segments remain aligned during loading. |

## Determine the angle through which end a of shaft ab rotatesdiameter, are connected by the gears shown. Knowing that G=11.2*10^6 psi, determine (a) the angle through which end A of shaft AB rotates, (b) the angle through which end E of shaft EF rotates. |

## Determine the force to overcome static friction with tableA 15kg Block rests on top of a 25kg Block which is subject to a 400N force. Block B sits on a table. the Coeffiecents of friction are the same for all surfaces, u(s) is .4 and U(k) is .3. The force is Applied to the bottom block ( with no inclinat.. |

## Determine the amount of natural alkalinity consumedjar tests were perfomed on untreated river water. an optimum dose of 12.5 mg/L of alum was determined. determine the amount of natural alkalinity (mg/L as CaCO3) consumed. |

## How large must storage tank be if it acts plug-flow reactorRadon from well water may pose a radiological health hazard. One treatment technique is simply to hod the water in storage, allowing the radon to decay. The decay rate is first order: |

## Determine the normal depth and critical depth in a trapezoidDetermine the normal depth and critical depth in a trapezoidal channel with a bottom width of 12.5 m, side slopes of 2:1, and a bed slope of 0.003 m/m. |

## Calculate mass of sludge wasted each day for sludge systemA wastewater treatment plant has a flow of 35,000 m3/day. Calculate the mass of sludge wasted each day (QwXw, expressed in kg/day) for an activated-sludge system operated at a solids retention time (SRT) of 5 days |

## Estimate the constant rate of withdrawal from reservoirEstimate the constant rate of withdrawal (in m^3/s) from a 1375 ha reservoir in a month of 30 days during which the reservoir level dropped by 0.75 m in spite of an average inflow into the reservoir of 0.5 Mm^3/day. |

## Determine thickness of viscous sublayer in a smooth pipeDetermine the thickness of the viscous sublayer in a smooth 20 cm diameter pipe, if the Reynolds number is 25000. |

## Determine the average normal strain in rubberAn air-filled rubber ball has a diameter of 6 in. If the air pressure within it is increased until the ball's diameter becomes 7 in., determine the average normal strain in rubber. |

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