What is the primary goal of increasing the concentration of MLSS in an activated sludge system?

The primary goal of increasing the concentration of Mixed Liquor Suspended Solids (MLSS) in an activated sludge system is to enhance microbial activity. A higher concentration of MLSS means more microorganisms are present in the aeration tank, which increases the biological treatment capacity of the system. These microbes are responsible for breaking down organic matter and other pollutants in wastewater. With a greater population of microorganisms, the efficiency of the treatment process improves, allowing for better degradation of pollutants and more effective removal of nutrients.

While reducing costs, improving odor control, and decreasing chemical use can be considerations in wastewater treatment operations, they are secondary to the fundamental goal of maximizing biological treatment efficiency. An enhanced microbial population directly contributes to improved overall performance of the activated sludge process, making it more effective in achieving regulatory compliance and meeting effluent quality standards.