LORD ST HELENS LANDFILL, NW ENGLAND, UK

St Helens, Merseyside
A Nitrification SBR Biological Leachate Treatment Plant for Cory Environmental.

This plant was process commissioned during Spring 2001. This has provided a solution for Cory Environmental to a leachate disposal problem to sewer.

Left: Inspecting the desludging chamber during commissioning.

Cory possessed a Trade Effluent consent to discharge leachate to the United Utilities sewer from this 2 year old landfill. However, the ammoniacal nitrogen strength of the leachate was progressively rising, and would soon have exceeded the permitted sewer discharge consent level, until an on-site leachate treatment plant was commissioned. The water utility company was unable to accept higher ammoniacal nitrogen loadings because there was insufficient capacity at the sewage treatment works. Also, the concentration of ammonia in sewer air spaces at higher concentrations may also become dangerous to the health of sewer maintenance staff.

The existing methane stripping plant had become a high maintenance commitment, due to calcium scaling problems and provided no treatment, other than rendering the leachate safe for sewer discharge.

The plant was constructed under a Design & Build Contract, was completed in 4 months, and has been working very successfully, as intended, since commissioning during late summer 2001.

The design flow is 80 cubic metres per day, and the total "All-In" Contract Cost was GBP £ 185,000, plus VAT, including Process Commissioning.