The project consisted of the design and construction
of a new 4.5Ml/day water treatment works at the existing Maltby
borehole pumping station site. The plant consists of aeration,
catalytic filtration for iron and manganese removal and disinfection
by on-site electrochlorination. A new 4500 m³ reservoir was
also included in the project. Whitewater worked with Acer Environmental
to develop a detailed process design for Birse Water Engineering.
Preparation of Process Flow Diagram, P&ID, control
philosophy, detailed process design and equipment specification.
Borehole water from three boreholes is aerated by a splash type
aerator and is then pumped through three horizontal pressure
filters using catalytic manganese dioxide media to effect oxidation
and filtration of iron and manganese.
The filtered water is chlorinated by the addition of sodium
hypochlorite and then passes into the reservoir. The sodium hypochlorite
is generated by electrolysis of brine and the plant consists
of salt storage, electrolysis equipment, hypochlorite storage,
dosing pumps and chlorine residual control. High lift pumps deliver
water into service reservoirs and additional chlorination is
provided at the high lift pumps.
The filters are cleaned by air scouring and washing with filtered
water from a dedicated storage tank. Dirty backwash water is
recovered by settlement and returned to the head of the works.