Improvement works to an existing 200MLD water treatment plant serving Liverpool from Lake Vyrnwy.
The works improve water quality by the removal of Total Organic Carbons (TOC), these being the precursor for THMs, a suspected cause of carcinogens. The construction comprised new dosing mixing, RGFs and wash water system for the entire 210 MLD flow to relieve the existing Slow Sand Filters. Additional benefits include iron reduction and colour reduction.
The works was constructed on a live site and thus liaison with operations was closely managed. The project was completed over 70 weeks and involved only one 8 hour shutdown and only one reportable H&S incident. The plant was commissioned by taking partial flow from the raw water with ramp up over the commissioning period.