Serpecon manufacture screw conveyors, liners & troughs for the waste water and municipal waste industries, we thought we would create an overview of the waste water treatment process.

1. Waste Water Process
The Stages of Waste Water Treatment
This is the screenings stage
where large objects that may
cause damage to equipment
is removed, this includes:
• Nappies
• Sanitary items
• Bottles
• Rags
Equipment is also used to
remove grit washed into the
sewer.
66.7 million people
in the UK
28 million
residential
properties
347,000 km of sewers
Managed by 9,000 sewage
treatment works
Receiving 11 billion litres
of waste produced per day
Primary
Treatment
Primary
Treatment
Secondary
Treatment
Tertiary
Stage
Separation of solid matter &
human waste, by placement
of waste water into settlement
tanks.
Large objects then sink and
are collected as “Sludge” from
the bottom of these tanks.
The sludge is removed for
further treatment with the
remaining water moved to the
next process.
The primary waste water
is placed into large tanks
called aeration lanes.
Bacteria is encouraged to
breakdown any remaining
sludge by having air
pumped into the tanks.
The final stage sees the
treated waste water flow
to a final settlement tank,
any sludge remaining
is treated.
The water is almost free
from harmful substances
& left to flow over a wall
and filtered through sand.
The filtered water is
released into the rivers.
Serpecon Waste Water, equipment | Conveyor replacements, spares & servicing | 01730 893 334