J2 Home Office Building, Sheffield

The proposed office building consists of a six storey office building. The total roof span of the building exceeds 2,632m². It was proposed to supply a combined grey/rain water recycling system in-line to a common grey/rain water collection point with overflow to the foul drain.

The reclaimed water was then used for WC's flushing within the building.

The benefits of grey water collection over rain water can be when rain water collection is intermittent or when roof collection areas are insufficient. In these cases we either mix a proportion of rain water with grey water or maintain a grey water supply only, in most case an amount of rain water is welcome due to dilution.

The benefits of rain water over grey water is when there is no grey water produced within a building or when there is a sufficient roof area as well as sufficient space on site for the increased size rain water collection tanks as generally grey water systems require far less collection tank capacity than rain water systems.

The system is designed to recycle both rain water and grey water which will be diverted to a common collection point and fed into the rain and grey water pre treatment tank which will pass through the multi media filter via a feed pump operated via a float switch within the pre treatment tank.

The feed pump will operate at 6m head allowing the filtered water to be boosted to the post treatment tank for distribution to the WC`s. The backwash pump will be operated manually, simply closing the inlet valve and opening the backwash valve and restarting the pump set.

The filter media (compound) will require backwashing on an interim basis and should be checked by maintenance.