The University sunk a borehole to provide drinking water
to the campus as an alterntive to mains water. The borehole
water exceeded the EC Drinking Water Directive limits for iron
and manganese and a new treatment plant was required to reduce
iron to below 200 m g/l and manganese to below 50 m g/l. Whitewater
reviewed the contractor's design and supervised installation
and commissioning on behalf of the University.
Review of process design calculations, Piping and Instrumentation
Diagram (P&ID), control philosophy and specifications for
major items of plant including pumps, filters and tankage.
The process route consists of aeration by compressed air injection
and pre-chlorination followed by filtration using pressure
filters charged with granular catalytic filter media. After
filtration the water is stored prior to distribution. Filter
backwash water is discharged to sewer.
The savings over using mains water resulted in a pay-back period
of three years.