Transcript domestic wastewater treatment facility

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.