# The Cambridge Waste Water Treatment Plant Relocation Order 2025, Part 5: ACTIVATED SLUDGE PROCESS TANKS (WORK No. 10)


(1) Item
(2) Maximum design parameter
Finished ground level (+ or – 0.5m)
9m AOD
Area of individual activated sludge process tanks
Reactor – 20m wide x 90m long
Number of reactor tanks
4 No.
Area of mixing and conditioning tank
25m wide x 25m long
Area of interstage pumping station
25m x 15m
Depth of activated sludge process tanks, mixing and conditioning tank and interstage pumping station
3m AOD (6m below FGL)
Height of activated sludge process tanks, mixing and conditioning tank and interstage pumping station
17m AOD (8m above FGL)
Foundation depth of overall activated sludge process area
-16m AOD (25m below FGL)
Blower Building – height
14m AOD (5m above FGL)
Blower Building footprint
25m x 15m
Overall footprint of activated sludge process area
115m x 135m

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Source: https://www.legislation.gov.uk/uksi/2025/452/schedule/14/part/5 (the official version)
Page: https://openlegislation.uk/cambridge-waste-water-treatment-plant-relocation-order-2025/schedule-14/part-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.