Sewage Treatment Plant Operator Interview Questions and Answers

An STP plant treats wastewater by removing contaminants and pollutants to produce clean water for discharge or reuse.

• Main functions include removing contaminants, pollutants, and solids from wastewater

• Treatment processes involve physical, chemical, and biological methods

• Equipment used includes screens, pumps, clarifiers, filters, and disinfection systems

• Maintenance involves regular inspections, cleaning, and calibration of equipment

• Safety protocols include wearing protective ...read more

The maximum MLSS (Mixed Liquor Suspended Solids) concentration in a sewage treatment plant should typically be around 3,000 to 5,000 mg/L.

• The maximum MLSS concentration is important for maintaining the biological treatment process in the plant.

• Higher MLSS concentrations can lead to issues such as poor settling of solids and increased energy consumption.

• Optimal MLSS levels can vary depending on the specific design and operation of the plant.

• For most plants, a range of 3,000 to...read more

The pH level of inlet water typically ranges from 6.5 to 8.5.

• pH level of inlet water is important for determining the acidity or alkalinity of the water

• The ideal pH range for sewage treatment is between 6.5 to 8.5

• pH levels outside of this range can affect the efficiency of the treatment process

The pH level of outlet water from a sewage treatment plant should ideally be between 6.5 to 8.5.

• The pH level of outlet water is important for ensuring the effectiveness of the treatment process.

• A pH level below 6.5 can indicate acidic water, which may be harmful to the environment and aquatic life.

• A pH level above 8.5 can indicate alkaline water, which may also have negative impacts on the environment.

• Regular monitoring and adjustment of pH levels is necessary to maintain pro...read more