Water & Wastewater Treatment

Servi c e | V al ue | Responsibility Bio Thelys™, thermal hydrolysis pre-treatment of sludge prior to anaerobic digestion, offering a flexible and safe solution for municipal and biological industrial sludge • Increases biogas yield by more than 50% • Produces enhanced treated sludge • Existing digestion plant throughput doubled • Reduces amount of sludge for final disposal The Power of Sludge Veolia technologies maximise biogas production and optimise energy recovery at wastewater treatment plants of all sizes www.veoliawaterst.co.uk/biothelys or call us on 01628 896900 www.wwtonline.co.uk | WWT | APRIL 2014 | 17 Top: Installed at new location Bottom: Specialised equipment for dosing PAC R ecently, a key water treatment works (WTW) in the north of England was facing closure due to a spike in the pesticide concentration found in the raw water supply entering the water treatment works. Due to tough constraints on allowable pesticide concentrations, which have to be below 0.1μg/l, the site was forced to shut down. The utility then had to divert water from another regional plant to maintain the local residents' supply of clean drinking water until the Emergency dosing installation Mobile system saves site from closure problem could be resolved. Water treatment specialist Transvac had originally supplied a TransPAC mobile carbon dosing system to back up another of the utility's WTPs, but when the pesticide concentration spike was detected, a recovery project was put together to relocate the TransPAC system to the failed site. Pesticide removal Adding powder activated carbon (PAC) into treatment works is one of Project focus ● Pesticide concentration spike detected ● Same-day relocation of mobile plant ● Innovative system to dose PAC LILLY SMITH TECHNICAL SALES ENGINEER, TRANSVAC ● Regularly problem with chemical contamination to the raw water sup- plies from agricultural pesticides that that get washed into water sources by heavy rainfall ● The Drinking Water Inspectorate monitors and inspects water quality to ensure levels of contami- nates are within allowable limits and when these lim- its are breached they issue notice to a water company to take action. ● Some pesticides can be very difficult to remove from water, requiring high levels of processing and additional treatments, which uses extra energy and resources • Drivers System being collected from original site

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