Hazards Green WTW

The expansion of Hazards Green WTW was due to South East Water’s requirement for a new independent water treatment clarifier stream to produce up to an additional 12.0 Ml/d of water.

Veolia Water Technologies provided the process design, construction, installation, testing and commissioning of 2 package unit Actiflo® High Rate Clarifiers. This water is blended with the effluent from the existing clarifier stream rapid gravity filters, before being treated through the existing GAC absorbers and chlorinated in the existing contact tank. In addition to the new Actiflo® clarifier stream, the existing sludge dewatering centrifuge was replaced by a membrane filter press. This press is sized to take the combined sludge flow from both treatment streams. The existing dirty washwater facilities have been retained but modified to interface with the new sludge thickening facilities which are centred on 2 Multiflo® sludge thickeners. The existing chemical dosing facilities have been replaced and/or upgraded to accommodate a revised chemical selection. The purpose of the project was to increase the treatment capacity of the works while improving the process response to sudden high raw water turbidity events. Due to its ability to start-up and achieve treatment requirements within minutes, Actiflo® has proved to be more effective and versatile than the original clarifiers in dealing with the raw water variations.

Due to its ability to start-up and achieve treatment requirements within minutes, Actiflo® has proved to be more effective and versatile than the original clarifiers in dealing with the raw water variations.