The town of Corby is located in England in the district of Northamptonshire. Until 1981 the second largest steel factory in Europe was located here. The wastewater treatment plant in Corby is designed for 110,500 PE, which corresponds to a dry weather inflow capacity of 18,454 m³/d. There are two process streams. Approximately 2/3 of the wastewater is treated in the conventional biological process and the remaining wastewater is treated in an MBBR process.
The conventional biological stage consists of two rectangular oxidation ditches, each 50m long, 20m wide and 2.2m deep.
The required oxygen input is achieved by surface aeration with 4 mammoth rotors in each tank. Anglian Water replaced the first 2 of 8 mammoth rotors in 2011. Following a series of reliability concerns, the decision was made to replace the remaining rotors.