Question

What would happen if oxygen availability to activated sludge flocs is reduced?

• A. It will slow down the rate of degradation of organic matter
• B. Flocs would increase in size as anaerobic bacteria would grow around flocs
• C. Protozoa would grow in large numbers
• D. None of these

Answer 1

The correct option is A It will slow down the rate of degradation of organic matter

Biodegradation is the process by which organic substances are broken down into smaller compounds by living microbial organisms that require ample oxygen for break down. Oxygen is the key requirement by microbes to degrade and break down the organic matter present in the sewage or the activated sludge. If the oxygen availability of the activated sludge floc is reduced, then the degradation rate of organic matter will slow down.