DOMESTIC WASTEWATER TREATMENT FACILITY

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

Domestic Sewage is the waste stream from kitchen wastes, dish & clothes washer wastes, and human wastes. Domestic sewage comes from all the homes and businesses in the area. Domestic sewage collects in pipes and then flows to the wastewater treatment facility. DOMESTIC SEWAGE

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

PRELIMINARY TREATMENT By the time the sewage gets to this stage there are few chunks but those few chunks are eliminated. Here the domestic sewage collects and flows through a bar screen and then a macerator, to grind the large chunks into small bits.

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

AERATION BASIN After the preliminary treatment the sewage is pumped into the aeration basin. The sewage is mixed with activated sludge and air is pumped in. Bacteria is also added to consume the domestic sewage.

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

CLARIFIER After the bacteria consumes most of the sewage a clearish liquid is left. It is pumped to the clarifier. The clarifier separates the liquids.

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

DISINFECTION (Gas chlorination) Here the clearish liquid is completely disinfected. The gas chlorination is very toxic.

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

DISCHARGE Here the water is as clean as it will get at a wastewater treatment facility. The water is sent off into rivers, creaks, etc.

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

1 st STAGE DIGESTER Here more air is pumped in for about 30 days. Then the air is turned off and the sewage separates into layers. The top and bottom layers, called sludge, are a brownish color and are pumped to the 2 nd stage digester. The middle layer is a clearish color and is returned to the aeration basin.

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

2 nd STAGE DIGESTER At this point more air is pumped into the sludge. The liquid then settles and is then taken and put into the drying beds.

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

SLUDGE DRYING BEDS Here the sludge and biosolids are put into these beds to dry. Thy become like a thick mud.

1 st STAGE DIGESTER DISCHARGE DISINFECTION - Gas chlorination PRELIMINARY TREATMENT CLARIFIER AERATION BASIN COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS 2 nd STAGE DIGESTER DOMESTIC SEWAGE Return Activated Sludge Wasted Activated Sludge

COMPOSTING BIOSOLIDS After the sludge and biosolids have dried it is mixed with wood chips. This forms human manure which is very rich in minerals.