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DOMESTIC WASTEWATER TREATMENT FACILITY DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS DOMESTIC SEWAGE • 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 PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS 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. DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS 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. DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS 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. DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS DISINFECTION (Gas chlorination) • Here the clearish liquid is completely disinfected. • The gas chlorination is very toxic. DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS 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. DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS st 1 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 2nd stage digester. The middle layer is a clearish color and is returned to the aeration basin. DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS nd 2 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. DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS SLUDGE DRYING BEDS • Here the sludge and biosolids are put into these beds to dry. Thy become like a thick mud. DOMESTIC SEWAGE PRELIMINARY TREATMENT AERATION BASIN CLARIFIER DISINFECTION Gas chlorination Return Activated Sludge DISCHARGE Wasted Activated Sludge 1st STAGE DIGESTER 2nd STAGE DIGESTER SLUDGE DRYING BEDS COMPOSTING BIOSOLIDS 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.