Pumping stations and service reservoirs

INTRODUCTION TO WATER TREATMENT & ABSTRACTION

A water treatment works
&
Service reservoir

The animations & information below relate to actual sites.

The treatment works produces up to 16 Ml/day.

Water is pumped via low lift pumps through an aerator & into DAF filters.
certain chemicals are added at this point these are chlorine (for disinfection) caustic soda or Kalic lime (for pH correction)
& ferric sulphate or poly aluminium chloride (a coagulant).
As the water enters the DAF filters a blanket of air bubbles is injected into the water this forms a blanket on the
top of the filters known as a floc.
The clean water passes through the base of the filter and moves by gravity to the contact tank
additional water treated by the GAC filters also enters the contact tank at the same point.
Prior to going into the Contact tank further treatments (chlorine & caustic soda) take place to ensure the water meets the treatment parameters.
The water is then pumped via the high lift pumps to A service reservoir. The final water is checked by instruments to ensure it is within parameters.

The picture below shows high lift & low lift pumps as green circles, Generally pumps that move water from reservoirs to other parts of a treatment works are called Low lift pumps.
Pumps that transfer water from a treatment works to a service reservoir are called High lift pumps.

Service reservoirs

The picture below shows the pumps as green circles.
Pumps that transfer water from service reservoirs are normally called booster pumps.
The water from the treatment works is pumped into A large service reservoir & from there It is distributed to the public.
This distribution can be by using pumps or gravity.