Design a set of activated sludge aeration tanks. The flow rate to treat is 5.6 MGD and the BOD concentration is 150 mg/L. The design solids concentration (X) at steady-state is 2,000 mg/l. The design MCRT is 7 days. The kinetic coefficients are as follows: K = 2 g BODg cells⋅d, Ks = 25 BOD/L, Kd = 0.06 day-1, Y = 0.5 g BODg cells⋅d. The influent ammonia concentration is 40 mg/l and nitrification is needed. It takes 1400 ft3of air per pound of BOD. Use rectangular tanks with a depth of 12 ft, a length to width ratio of 6 to 1, and a maximum length of 110 ft. Determine the following:

a) The hydraulic retention time (hr)

b) The steady-state effluent BOD concentration (mg/L)

c) The number of tanks and their lengths (ft) and widths (ft)

d) The air requirement (ft3/min)

Identify the emerging role of aircraft and parachutes in supporting and maintaining pressure or defensive efforts on certain fronts.

Find the depth and top width of a triangular notch capable of

discharging a maximum quantity of 700 lit/sec and such that the

head shall be 8 cm when the discharge is 6 lit/sec. The K for the

notch is the same as for a right angled notch, that has a value

of, K = 1.42.

Describe 2 advantages and 2 disadvantages for masonry building,reinforced concrete building and steel structural building,respectively

Describe the mainfeatures of civil engineering in history.
1)Ancienttimes
2)Recenttimes
3)Moderntimes

Explain the priorities of connections when we plan and design connections in urban areas.

Explain characteristics of “Perimeter blocks”

A simply supported flanged beam subjected to a factored load of 60 kN/m (including dead load and live load). The beam has an overall depth of 600 mm including slab thickness of 100 mm. The width of the beam is 230 mm, effective span of the beam is 6.25 m and effective cover to the tension reinforcement is 50 mm. Assume M25 grade concrete and Fe415 steel. Check whether the beam needs to be designed as singly reinforced or doubly reinforced

what are the Municipal solid waste management strategies?and industrial waste management strategies ?

C. Reflection on the Negotiation Process (1,000 words) [10 marks] 1. Mistakes during negotiations 2. Negotiation techniques learnt 3. Future improvements.

discuss the effect of modes to the overall behavior of the structure.

Construction Safety

1. Corporate safety plans, site specific safety plans, and emergency response plans are very long and detailed. Employees are usually trained in the application of these plans but what happens to workers and the company if an employee with duties in these plans does not remember something they are responsible to do in the plans when an accident or emergency happens? Please write a comprehensive answer including 1) possible reasons what went wrong, 2) what can be the consequences and 3) how it should be avoided in future (one page)

1.1 The average effective overburden pressure on a 10 mts – thick layer in the field is 136 kN/m2 and the average void ratio is 0.98. If a uniform surcharge of 200 kN/m2 is applied on the ground surface, determine the consolidation settlement for the following cases, Cc = 0.35, Cs = 0.08.
a)Preconsolidation pressure, σ'p = 350 kN / m2 b) b)Preconsolidation pressure, σ'p = 150 kN / m2

1.2 For case b) of the previous exercise determine, a) What is the void ratio at the end of 100% of consolidation. b) If Cv = 1.5 mm2 / min, how long will it take to settle the first 100 mm? Take the two-way drain for the clay layer.

Calculate Liming Requirements. You have a soil sample with a CEC of 10 meq / 100 g soil, a pH of 4.8 and a BS of 37%. You would like to raise this soil to a pH of 6.5, so you need to raise the BS to 65%. You also have a Mg deficiency. Assume 93% purity of your liming agent. During screening of a 100g sample, you had 1.5 g on the 8-mesh screen, and 13.4 g on the 60-mesh screen. Choose the appropriate liming agent and calculate CCE, ECCE, and the tons of lime you need to apply to your 100 acre field.