1. What are the two advantages of tube settler as compared to the conventional sedimentation?

2. Compare the following factors for chlorine and ozone

1. Disinfection time and dose
2. Residual disinfection
3. Interference by raw water turbidity
4. THM formation

3. The water from a river used for water supply contains 6 mg/L of BOD₅, 2 mg/L of aldrin (pesticide residue) and 14 NTU of turbidity. Suggest a treatment process which is technically and economically viable. Explain the reason why you selected this treatment system?

4.Under what conditions is powdered activated carbon preferred over granulated activated carbon adsorption system? and Why?

5.Explain two situations where the dissolved air flotation (DAF) is preferred over a sedimentation tank in drinking water treatment.

1a). For a single, handheld, GPS receiver operating in point positioning mode: i. Explain how the receiver uses signals from four satellites to determine its position on Earth. ii. Approximately what East, North and Height accuracy would you expect from this receiver? iii. What are the main factors that limit the positioning accuracy of this receiver? (b) What techniques are used to overcome the spatial accuracy limitations of a single, handheld, GPS receiver operating in point positioning mode?

Design the concrete mix according to the following conditions: Design Environment Caissons for Bridge pier crossing to the Outer Bankers, NC Required design strength=4800psi

Minimum dimension = 12 in.

Minimum space between rebars = 2.5 in.

Minimum cover over rebars = 2.5 in.

Statistical data indicate a standard deviation of compressive strength of 250 psi is expected (more than 30 samples).

Only air entrained is allowed. Available Materials Air entrainer: Manufacture specification is 0.15 fl oz/1% air/100 lb cement.

Aggregate: 1 in. nominal maximum size, crushed stone

Bulk oven-dry specific gravity=2.45,absorption=2.5%

Oven-dry rodded density=125pcf

Moisture content=1.5%

Fine aggregate: Natural sand

Bulk oven-dry specific gravity=2.61,absorption=3.4%

Moisture content=3.8%

Fineness modulus=2.81

1. Calculate the strength requirements.(psi)

2. Part 2: Determine the water to cement ratio.

3: Calculate the volume of coarse aggregate (lb/yd^3)

4: Find the air content percentage (%)

5: Determine the workability.

Use A992 and select a W shape for the following beam:

- Simply supported with a span length of 30 ft

- Braced at the ends of the beam only

- Uniform dead load of .75 kips

- A 34 kip point load at midspan

Use ASD

following facilities the trickling filter, and the Aeration basion are used for clarification of water and wastewater during treatment.

Write short notes on each one of them with more emphasis on the similarities and differences

in treatment processes, advantages and disadvantages between them.

Design the concrete mix according to the following conditions: Design Environment Caissons for Bridge pier crossing to the Outer Bankers, NC Required design strength=4800psi

Minimum dimension = 12 in.

Minimum space between rebars = 2.5 in.

Minimum cover over rebars = 2.5 in. Statistical data indicate a standard deviation of compressive strength of 250 psi is expected (more than 30 samples).

Only air entrained is allowed. Available Materials Air entrainer: Manufacture specification is 0.15 fl oz/1% air/100 lb cement.

Aggregate: 1 in. nominal maximum size, crushed stone

Bulk oven-dry specific gravity=2.45,absorption=2.5%

Oven-dry rodded density=125pcf

Moisture content=1.5%

Fine aggregate: Natural sand

Bulk oven-dry specific gravity=2.61,absorption=3.4%

Moisture content=3.8%

Fineness modulus=2.81

6: Calculate the desired water content (lb/yd^3)

7: Calculate the Cement Content (lb/yd^3)

8: Calculate the admixture requirements.(fl oz/yd^3))

9: Calculate the weight of the Fine Aggregate.(lb/yd^3))

10: Calculate the new water requirement based on the moisture corrections (lb/yd^3)

Calculate the flow depth in a rectangular riveted steel open channel with a width of 6.1 m and a slope of 0.0001, since the water flow is 6.8 m3/s.

what are raw materials and types of cement in industry of cement?

in 800 words or more (please no less), i don't want an intro about cement.

The angular acceleration of a shaft is given by α = -0.20ω rad/s2 , where ω represents the angular velocity of the shaft. If at t = 0 the angular velocity ω of the shaft is 18 rad/s, determine (a) the number of revolutions the shaft will execute before coming to rest, (b) the time required for the shaft to come to rest, (c) the time required for the angular velocity of the shaft to be reduced to 1 rad/s

PLEASE ANSWER ASAP !!!!!!!! VERY URGENT !!!!!!! THANK U !!!!!!!!!!

Question:

Imagine the fire department had to evacuate the 25th floor of an office building. For firefighters to safely reach people at this height, how long would the truck’s ladder have to be and how much would it weigh? Based on this, do you think Pierce should manufacturer this apparatus? Explain.

Ex if std no: 1abcde, 161667 (a=6, b=1, c=6, d=6, e=7)
In my case std 174702

Q1) Design a concrete mixture proportions which will be used for offshore concrete platform. Norway is a world leader on offshore concrete platforms with 1a of the world’s 30 larger offshore concrete structures located on the Norwegian continental shelf. The first of these platforms where the Ekofisk Tank installed in 1974 and the last was Troll gravity based structure installed in 1996. The Sakhalin project is located in a harsh and artic environment where concrete structures have proven excellent characteristics with a minimum of maintenance. 80 mm slump value is required for the Sakhalin project. 28-days concrete characteristic strength is 2b MPa. It is required that no more than 1 test result in 100 will fall below the specified strength. The fine aggregate has a fineness modulus of 2.60 and Zone 3. For Coarse Aggregate (Uncrushed): SSD Bulk Specific Gravity: 2.65, Absorption Capacity: 2.b %, Total Moisture: 1.c % and Dry Rodded Unit Weight: 1345 kg/m3. For Fine Aggregate (Uncrushed): SSD Bulk Specific Gravity: 2.70, Total Moisture: 3.d % and Free Moisture: 2 %. Cement: Portland Composite Cement, Specific Gravity: 2.97. For 0.e5 m3 of concrete, binder amount is calculated as 120 kg (Use ACI Method of Mix Design)

Q2) What would be the maximum aggregate size used for the given mixture properties by using ACI Method of Mix Design. 28-day specified concrete strength is 3b Mpa, standard deviation is choosen as 3.a Mpa and it is required that no more than 1 test result in 200 will fall below the specified strength.
Project Title: Detoration of wood column of a commercial building
Project summary: Wood deterioration at the lower level of a heavy timber column, which supports five floor levels, was remedied by removing a section of column and the construction of a new concrete pier and footing.
For Coarse Aggregate (Uncrushed): SSD Bulk Specific Gravity: 2.60, Absorption Capacity: 1.8 %, Total Moisture: 2.3 % and Dry Rodded Unit Weight: 1430 kg/m3.
For Fine Aggregate (Crushed): SSD Bulk Specific Gravity: 2.70, Total Moisture: 3.c % and Free Moisture: 1.d %. FM= 2.65, Zone II.
Cement: Portland Composite Cement, Specific Gravity: 3.01. For 0.2a m3 cement is calculated as 12b kg.

Q3) use the data in question 2 and determine the amount of chemical admixture required for 0.b% and 0.cd%

Ex if std no: 1abcde, 161667 (a=6, b=1, c=6, d=6, e=7)
In my case std 174702

Q1) Design a concrete mixture proportions which will be used for offshore concrete platform. Norway is a world leader on offshore concrete platforms with 1a of the world’s 30 larger offshore concrete structures located on the Norwegian continental shelf. The first of these platforms where the Ekofisk Tank installed in 1974 and the last was Troll gravity based structure installed in 1996. The Sakhalin project is located in a harsh and artic environment where concrete structures have proven excellent characteristics with a minimum of maintenance. 80 mm slump value is required for the Sakhalin project. 28-days concrete characteristic strength is 2b MPa. It is required that no more than 1 test result in 100 will fall below the specified strength. The fine aggregate has a fineness modulus of 2.60 and Zone 3. For Coarse Aggregate (Uncrushed): SSD Bulk Specific Gravity: 2.65, Absorption Capacity: 2.b %, Total Moisture: 1.c % and Dry Rodded Unit Weight: 1345 kg/m3. For Fine Aggregate (Uncrushed): SSD Bulk Specific Gravity: 2.70, Total Moisture: 3.d % and Free Moisture: 2 %. Cement: Portland Composite Cement, Specific Gravity: 2.97. For 0.e5 m3 of concrete, binder amount is calculated as 120 kg (Use ACI Method of Mix Design)

Chemical destruction of contaminants of emerging concerns (CESs)in wastewater .Can u explain step by step deeply ,

1 Explain the significance of low For content in lunar rocks for understanding the origin of the moon and earth
2 Explain the significance oh hornblende(amphibole) in volcanic rocks understanding the explosive style of eruptions of volcanoes in the"Ring of fore"?
3Three mechanisms that can produce compositional banding in banding in gneisses