Bay View Wastewater Treatment Plant Process

FINE BAR SCREENS AND PUMP STATIONS

Screens remove debris to prevent clogging and protect pumping equipment. Pump stations transport raw sewage to the treatment plant.

AERATED GRIT TANKS

Remove five to ten tons of grit (sand, gravel, and other heavy solids) daily for landfill disposal.

OIL AND GREASE SKIMMING TANKS

Collect and transfer floatables to scum separation tanks. The sludge settles to the bottom and is pumped to the sludge thickeners.

PRIMARY CLARIFIERS

Add polymer to the water to allow more solids to settle to the bottom and floatables to rise to the surface. Floatables are skimmed and sent to a landfill. Solids are pumped to the digester tanks.

AERATION TANKS

Mix air with wastewater to promote growth of aerobic microorganisms which help to break down organic matter.

FINAL CLARIFIERS

Encourage floc, which contains microorganisms and organic material, to settle, leaving clarified water on the surface. This process creates return activated sludge, which is sent to the aeration tanks, and waste activated sludge, which is sent to dissolved air floatation.

CHLORINE CONTACT TANK

Mixes chlorine with clarified water to provide disinfection before discharge into the Maumee River (required April 1st to October 31st).

CONTROL ROOM

Allows plant personnel to monitor and control treatment processes via computer. Computers also track the plant's performance for documentation in monthly operating reports.

GRAVITY THICKENERS

Thicken raw primary sludge prior to placement in the Digester Storage and Mix Tank. Dilution water (final effluent) is added to keep the tanks from becoming septic. Thickener effluent is returned to the secondary tanks.

DISSOLVED AIR FLOATATION

Adds polymer to waste activated sludge and mixes it with pressurized water. Solid floatables are skimmed and pumped to the digesters. Remaining water flows back to the aeration tanks.

ANAEROBIC DIGESTERS

Biologically stabilize sludge using anaerobic bacteria. This process produces methane gas, a source of energy for the plant.

BELT FILTER PRESSES

Add polymer to the sludge from the digesters. Sludge is then dewatered in belt filter presses, and sent to the biosolids reuse programs. Remaining water is returned to the aeration tanks.

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PROCESS FLOW DIAGRAMS