3D animation of tertiary sewage treatment process at the Eastern Treatment Plant

Summary

The video outlines the operation of a new advanced tertiary treatment plant at the Eastern treatment facility, spanning 6 hectares. It details a seven-step process starting with the lifting of effluent, followed by ozone treatment to reduce color and odor, and the use of biological filters to remove impurities. Water is then further disinfected using ozone and ultraviolet light, with chlorine as a final step. After treatment, the effluent undergoes a 30-minute retention in chlorine contact basins before being discharged to the ocean or recycled. The process is designed for efficient wastewater treatment and environmental compliance.

Takeaways

• 😀 The new tertiary treatment plant occupies 6 hectares within the existing Eastern treatment plant boundary.
• 😀 The plant features chlorine contact basins, UV and ozone disinfection systems, biological filters, solids handling facilities, ozone production and injection buildings, and a tertiary supply pump station.
• 😀 The advanced tertiary treatment process involves seven key steps, starting with effluent entering the plant via the tertiary supply pump station.
• 😀 The purpose of the tertiary supply pump station is to lift effluent from existing holding basins to begin the treatment process.
• 😀 Ozone is added in the first treatment stage to reduce color and odor, optimizing subsequent stages of the treatment process.
• 😀 Biological filters remove oil, grease, foam, litter, and solids, while helpful bacteria break down organic compounds and reduce ammonia.
• 😀 The biological filters are cleaned using treated water, with dirty backwash water processed to separate out solids, which are sent to existing sludge digesters.
• 😀 In the fourth treatment stage, ozone is again used for advanced disinfection of the filtered water.
• 😀 After ozone treatment, the effluent undergoes ultraviolet light exposure for further disinfection, followed by chlorine addition as the third disinfection stage.
• 😀 The treated water is retained in chlorine contact basins for at least 30 minutes before being transferred to the existing outfall pump station for discharge.
• 😀 Some treated water is recycled, and the remainder is discharged into the ocean under EPA Victoria’s license.

Q & A

What is the purpose of the new tertiary treatment plant?

The new tertiary treatment plant is designed to further treat wastewater by reducing pollutants and improving the quality of effluent before it is discharged into the environment or recycled.

How large is the area occupied by the new tertiary treatment plant?

The new tertiary treatment plant occupies an area of about 6 hectares.

What are the main components of the new tertiary treatment plant?

The main components of the new plant include two large chlorine contact basins, UV and ozone disinfection systems, biological filters, a solids handling facility, ozone production and injection buildings, and a tertiary supply pump station.

What is the role of the tertiary supply pump station?

The tertiary supply pump station lifts effluent from the existing holding basins to initiate the tertiary treatment process.

What does the first stage of the tertiary treatment process involve?

In the first stage, ozone is added to the effluent to reduce color and odor and to optimize the effectiveness of subsequent treatment steps.

How is ozone generated for the treatment process?

Ozone is generated on-site using air as an oxygen source.

What is the purpose of the biological filters in the tertiary treatment process?

The biological filters remove oil, grease, foam, litter, and solids, while helpful bacteria break down organic compounds and reduce ammonia.

How are the biological filters cleaned?

The biological filters are cleaned using treated water, and the dirty backwash water is processed to separate out solids, which are then sent to the existing Eastern treatment plant sludge digesters.

What happens after the filtered water is treated with ozone for a second time?

After the second ozone treatment, the effluent is exposed to ultraviolet (UV) light for further disinfection, followed by chlorination as the final disinfection stage.

What is the purpose of the chlorine contact basins in the tertiary treatment process?

The chlorine contact basins allow treated water to be retained for at least 30 minutes, ensuring that the disinfection process is effective before the water is released.

What happens to the treated water after the disinfection process?

The tertiary treated water is transferred to the existing outfall pump station, which discharges the water to the southeast outfall. Some of the treated water is recycled, and the remainder is discharged into the ocean under an EPA Victoria license.