Wildlife Investors Day out at the Itchen Valley waterworks

Wildlife Investors Day out at the Itchen Valley waterworks

Itchen valley waterworks

A great day out with Hampshire Wildlife Trust

We enjoyed a fascinating tour of the water treatment system owned by Portsmouth Water, showing how safe water is produced. The site is a wonderful wildlife refuge close to Southampton Airport, the M3 and the River Itchen. Quiet because much of the operation is automatic so the staffing is low, the whole area is sensitively managed with wildlife very much in mind.

The water is initially pumped into an open storage reservoir which can hold up to 135 million litres. Water from the reservoir is then dosed with chemicals in the ‘clarification stage’ of the treatment process where most of the smaller particles ‘settle out’. Any remaining particles, as well as tastes, odours and other chemicals are removed in the ‘filtration stage’ before chlorine is added to ensure the safety and wholesomeness of the treated water leaving the works.

The old settlement lagoon is neck deep in vegetation and has one of Graham Roberst otter holts - in use!

floculation tanks

Part of the chemical purification, generating a 'floc'

backwashing the activated carbon bed

backwashing the activated carbon bed. This is used to remove and chemical impurities.

settlement lagoons

Settlement lagoon, with artificial otter holt in the centre you can't see it!

River Itchen alongside the waterworks

River Itchen alongside the waterworks

semipermeable membrane filters used to remove Cryptosporidia from drinking water

semipermeable membrane filters used to remove Cryptosporidia from drinking water

Proud to support the Wildlife Trust