Activated Sludge Process and Bacteria Removal

Activated sludge process is a biological wastewater treatment process that involves the use of microorganisms to break down organic matter in wastewater. The microorganisms are suspended in a liquid medium and are aerated to provide oxygen for their metabolic processes. The process is designed to remove organic matter, nitrogen, and phosphorus from wastewater.

Bacteria Removal and Acceptable Lower Limit

The removal of bacteria from wastewater is an important aspect of wastewater treatment. The acceptable lower limit of bacteria removal through activated sludge process is determined by the regulatory authorities based on the quality standards for discharged wastewater. In general, the acceptable lower limit of bacteria removal through activated sludge process is 90%.

Reasons for Acceptable Lower Limit of 90%

The acceptable lower limit of 90% bacteria removal through activated sludge process is based on the following reasons:

1. Health and Environmental Concerns: The presence of bacteria in wastewater can pose health risks to humans and animals if the wastewater is discharged into surface water bodies or used for irrigation purposes. Therefore, it is important to remove bacteria from wastewater to prevent the spread of diseases and protect the environment.

2. Regulatory Standards: Regulatory agencies have established quality standards for discharged wastewater to protect the environment and public health. The acceptable lower limit of 90% bacteria removal through activated sludge process is based on these regulatory standards.

3. Treatment Efficiency: The activated sludge process is an efficient method for removing bacteria from wastewater. However, achieving a 100% removal rate may not be practical or cost-effective. Therefore, the acceptable lower limit of 90% bacteria removal is a reasonable target for most wastewater treatment plants.

Conclusion

In conclusion, the acceptable lower limit of bacteria removal through activated sludge process is 90%. This target is based on health and environmental concerns, regulatory standards, and treatment efficiency. Wastewater treatment plants should strive to achieve this target to ensure the quality of discharged wastewater.