Wastewater conveyance and treatment systems are generally designed for a predetermined period. The nature of build-up of flow over the time horizon is generally overlooked, resulting in design entailing unwarranted lock-up of excessive finances. The proposed work envisages phased expansion of treatment facility for wastewater produced by a part of Kanpur city. In one of the phased expansion schemes as discussed here, the energy intensive extended aeration activated sludge (EAAS) is converted at a later time horizon to a capital intensive activated sludge unit (ASU) with a provision for sludge treatment, thus effecting deferred capital investment.

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