Design a low rate trickling filter for secondary treatment of sewage generated from 10,000 persons with rate of water supply 170 liters per capita per day. The BOD5 after primary treatment is 110 mg/L and BOD5 of final effluent should be 20 mg/L. Consider the following equation, where C = 5.358.

(St/So)=(1)/(1+C((D^0.67)/(QL^0.5))

Now, design a high rate trickling filter for the data given above except effluent BOD5 is 40 mg/l since polishing treatment is provided after high rate trickling filter. Consider a recirculation ratio of 2 and a filter depth of 1.8 m.

Calculate balanced and unbalanced snow loading for a heated garage/workshop located in the most northern part of Maine at the site of a 200 ft hight from the mean seal level. The area exhibits low wind and is populated with some trees. The structure is occupied by workers daily, has an asphalt gable roof with a pitch of 4 over 12 and is 44’ by 44’.

Draw profile and name it:

- Sluice gate on mild slope

- Dam on Mild slope

- Mild - Steep- Steeper- Drop

It has been estimated that the concentration of CO2 in the atmosphere before the Industrial Revolution was about 275 ppmv. If the accumulation of CO2 in the atmosphere continues, then by the middle of this century, it will probably be around 600 ppmv. Calculate the pH of rainwater (neglecting the effect of any other gases) at 25oC both before the Industrial Revolution and by the middle of this century (KH = 0.033363 mol/L∙atm, pKa1 = 6.35, pKa2 = 10.33).

A window-mounted air conditioner supplies 19 m3/min of air at 15°C, 1 bar to a room. Air returns from the room to the evaporator of the unit at 22°C. The air conditioner operates at steady state on a vapor-compression refrigeration cycle with Refrigerant 22 entering the compressor at 4 bar, 10°C. Saturated liquid refrigerant at 11.5 bar leaves the condenser. The compressor has an isentropic efficiency of 70%, and refrigerant exits the compressor at 11.5 bar. Determine:

(a) the compressor power, in kW.

(b) the refrigeration capacity, in tons.

(c) the coefficient of performance.

What will be the shear force diagram and bending moment diagram for this question if the P is 4.0kN instead of 3.6kN?

https://www.chegg.com/homework-help/cantilever-timber-beam-loads-span-shown-select-economical-re-chapter-13-problem-23P-solution-9780135034521-exc

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) Explain the difference between a direct and indirect observation. Provide an example of each not found in the “Error in Surveying” reading. What is the definition of an error? Why can we not calculate an exact error?

1. Write a dimension relationship for The period of oscillation T of a water surface wave that is assumed to be a function of density r , wavelength λ, depth h, gravity g, and surface tension σ . What will be the results if surface tension is negligible? Hint: Take λ, r, and g as repeating variables.

Provide the Introduction for the minor Project 1-Culvert Design. It should include at least the following information:

INTRODUCTION

A.General facts on culverts

B.Overview of Culverts

1.Shapes

1. Materials

2. Inlet types and selection

3. Considerations regarding Velocity at the culvert Outlet

4. Information regarding construction and culvert maintenance.

5. Culvert Hydraulic Programs.

Sketches and images to elucidate the information are also required

You are making a decision between three (3) competing bids for a new road construction. Describe and discuss the engineering decision making tools that you might employ to help you decide on the best proposal.

For the following situations, choose a modeling method and explain why you would use it.
a. Designing a prosthetic limb

b. Routing a piping system for a building

c. Designing a one-of-a-kind machined part

d. Verifying clearances for an electrical substation located near an airfield

e. Mapping an oil reservoir

Make a search about a materials used on engineering (Civil Engineering), the search must includes:
The type of materials which used to fabricate the device
The structure type
The composition
The function
The advantage
The disadvantage
The limitation of used
The problem in service
The new research on the field

1- There is mainly four kinds of behavior under stress which is Elastic, Plastic ,Viscous ,and Brittle: which of these behavior soil can be categorized ,Explain for each case:-
a)Elastic

b)Plastic

c)Viscous

d)Brittle

2-Soil Stress-Strain Behavior can be expressed by :-

a)Linear ELASTIC

b) NON Linear Elastic

c)Elasto-Plastic

d) Elastic Perfectly Plastic

Draw the Stress Strain Curve that describe each case; and mention the main characteristic of each curve.