What is the range of pH in mg L above which aeration is required?

The pH of the aeration tank should be between 6.5-8.5 to avoid stress on the microbial community and for optimal biological activity. Dissolved oxygen levels in the aeration tank must be maintained at 1-3 mg/L for effective treatment.

What is pH in wastewater treatment?

The term “pH” refers to the measurement of hydrogen ion activity in the solution. Determination of pH plays an important role in the wastewater treatment process. Extreme levels, presence of particulate matters, accumulation of toxic chemicals and increasing alkalinity levels are common problems in wastewater.

How does sewage treatment plants work?

Primary Treatment As sewage enters a plant for treatment, it flows through a screen, which removes large floating objects such as rags and sticks that might clog pipes or damage equipment. After sewage has been screened, it passes into a grit chamber, where cinders, sand, and small stones settle to the bottom.

How does aeration affect pH?

Aeration will also increase this rate of outgassing. As the carbon dioxide outgases, the pH rises with no change in total alkalinity. In other words, add acid until the alkalinity reaches about 90 to 100 ppm. Then aerate until the pH rises to 7.4 to 7.6.

Why do wastewater treatment plants smell?

Generally speaking, foul odors at treatment plants originate from the anaerobic decomposition of organic compounds. Due to its low solubility in wastewater, it is released into the atmosphere, producing an offensive odor. Amines and mercaptans are two other odor-causing offenders at treatment plants.

Do modern sewage treatment plants smell?

Sewage treatment plants are similar to septic tanks, but with a few differences. If your sewage treatment plant is regularly serviced by a professional – at least once a year – then it shouldn’t smell. If there is a foul odour, then call for a service as soon as possible to isolate and fix the problem.

How do you maintain pH in a sewage treatment plant?

In Wastewater If all alkalinity in the wastewater process is consumed, an alkaline solution such as caustic soda or magnesium hydroxide can be added to maintain the system pH between 7-8 as the denitrifying bacteria generate acid but this adds cost and complexity to the system.