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romanna [79]
3 years ago
12

Ammonia is one of the chemical constituents of industrial waste that must be removed in a treatment plant before the waste can s

afely be discharged into a river or estuary. Ammonia is normally present in waste water as aqueous ammonium hydroxide (NH4OH-). A two-part process is frequently carried out to accomplish the removal. Lime (CaO) is first added to the wastewater, leading to the reaction
CaO + H2O --> Ca2+ + 2(OH-)
The hydroxide ions produced in this reaction drive the following reaction to the right, resulting in the conversion of ammonium ions to dissolved ammonia:

NH4+ + OH- <--> NH3(g) + H2O(l)
Air is then contacted with the wastewater, stripping out the ammonia.

a. One million gallons per day of alkaline wastewater containing 0.03 mol NH3/mole ammonia-free H2O is fed to a stripping tower that operates at 68oF. Air at 68oF and 21.3 psi contacts the wastewater countercurrently as it passes through the tower. The feed ratio is 300 ft3 air/gal wastewater, and 93% of the ammonia is stripped from the wastewater. Calculate the volumetric flow rate of the gas leaving the tower and the partial pressure of ammonia in this gas.
b. Briefly explain in terms a first-year chemistry student could understand how this process works. Include the equilibrium constant for the second reaction in your explanation.

Engineering
1 answer:
Yanka [14]3 years ago
5 0

Answer:

Following is attached the solution or the question given.

I hope it will help you a lot!

Explanation:

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A household refrigerator that has a power input of 450 W and a COP of 1.5 is to cool five large watermelons, 10 kg each, to 8°C.
Andreyy89

Answer:

6222.22 sec

Explanation:

Given data the power input to the refrigerator is 450 W

The COP of refrigerator is 1.5

Temperature T_1=8^{\circ}C

T_2=28^{\circ}C

mass of watermelon =10 kg

specific heat =4.2 KJ/kg°C

The amount of heat removed from 5 watermelon

Q=mc_pdt=5\times 10\times 4.2\times (28-8)=4200 KJ

We know that COP=\frac{Q_1}{W}

1.5=\frac{Q_1}{450}

Q_1=675 W=0.675 KW

so time required to cool the watermelon is

t=\frac{Q_1}{Q_2}=\frac{4200}{0.675}=6222.22 sec  

4 0
3 years ago
Why a brass lid ring on a glass canning jar will loosen when heated.
Zolol [24]

hi here is your answer hope it helps or then sry

Explanation:

A brass lid on a glass canning jar will loosen when heated because brasshas the greater coefficient of thermal expansion 

4 0
3 years ago
Technician A says that to start a fuel-injected car, the accelerator should be depressed
Bumek [7]

Answer:

Technician A says that primary vibration is created by slight differences in the inertia of the pistons between top dead center and bottom dead center. Technician B says that secondary vibration is a strong low-frequency vibration caused by the movement of the piston traveling up and down the cylinder. Who is correct? O A. Neither Technician A nor B OB. Technician B O C. Both Technicians A and B D. Technician A​

Explanation:

Technician A says that primary vibration is created by slight differences in the inertia of the pistons between top dead center and bottom dead center. Technician B says that secondary vibration is a strong low-frequency vibration caused by the movement of the piston traveling up and down the cylinder. Who is correct? O A. Neither Technician A nor B OB. Technician B O C. Both Technicians A and B D. Technician A​

7 0
2 years ago
Water at 60°F passes through 0.75-in-internal diameter copper tubes at a rate of 1.2 lbm/s. Determine the pumping power per ft
Lelu [443]

Answer:

The pumping power per ft of pipe length required to maintain this flow at the specified rate 0.370 Watts

Explanation:

See calculation attached.

- First obtain the properties of water at 60⁰F. Density of water, dynamic viscosity, roughness value of copper tubing.

- Calculate the cross-sectional flow area.

- Calculate the average velocity of water in the copper tubes.

- Calculate the frictional factor for the copper tubing for turbulent flow using Colebrook equation.

- Calculate the pressure drop in the copper tubes.

- Then finally calculate the power required for pumping.

8 0
3 years ago
Exposure to asbestos dust can cause what condition?
Natali5045456 [20]
If you end up breathing asbestos fibers, it can increase the risk of serous diseases. Some examples are lung cancer, mesothelioma and asbestosis. It may also increase your risk for cancers of the digestive system, which includes colon cancer. Asbestos is dangerous when fibers become airborne. That is because once a person ingests or inhales asbestos, the fiber can’t be removable from the body. The fibers can cause irritation and scarring over time if it’s embed into the tissue.
4 0
3 years ago
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