Question

The aeration process changes the odor of wastewater.
A) True
B) False

Answer 1

Hint: Two dissolved gases such as carbon dioxide water and air come in close contact through the process called aeration. Aeration helps in oxidizing dissolved metals like iron, hydrogen sulfide, and volatile organic chemicals. For the treatment plants also it is the first major process to use for the treatment.

Complete answer:
Aeration in the wastewater is done by adding air into the wastewater to allow aerobic biodegradation of the pollutant component. So, it is the most important part of the biological wastewater treatment systems.
- Chemicals used to react and stabilize the contaminants in the wastewater stream in chemical treatment but in biological treatment, microorganisms are used to degrade wastewater contaminants that occur naturally in the wastewater.
- In the process of aeration oxygen is mixed into the water .the increase in the concentration of oxygen increases the microbial growth in the water. The microorganisms act on the organic matter and create flocks in the water that settle down in the water.
- When the organic matter degrades, it changes the pH of the water, and a number of gases are produced like hydrogen sulfide which creates an odor.

Additional information:
- By exposing drops or thin sheets of water to the air, the water, and the air come in close contact by the aeration process.
- The dissolved gases were physically removed by the turbulence of the aeration through the scrubbing process and give permission to escape into the surrounding air.
- It also helps in removing the dissolved metals through oxidation.
- The amount of surface contact between air and water tells about the efficiency of aeration.
- Aeration also increases the palpability of the water by removing the flat taste by adding oxygen into the water.
So, the correct answer is, ”(A) True”.

Note: Thus, mixing air(oxygen) into the wastewater to promote the growth of aerobic bacteria is known as aeration.
- The supply of oxygen can be done naturally or mechanically through mixing or using oxygen diffusion systems.
- Municipal wastewater treatment facilities use this technique to stabilize the waste and provide odor control