Low in maintenance, the only submerged moving part is the effluent weir
used for desludging.
John Wastewater Treatment Plant, including replacement of the clarifier drive, aeration piping/air diffusers components, return sludge air lift pump, effluent weir
plates, and protective coating system on the tank.
A diffuser for sulfur dioxide solution was added to the end of each chlorine contact tank ahead of the effluent weir
The clarified water flows over the effluent weirs
and discharges to the excess flow chlorine contact basin, where the flow is disinfected by sodium hypochlorite and dechlorinated with sodium bisulfite.
As plant flow increased, however, the ferric chloride floc tended to rise over the effluent weirs
To meet Phase III plant capacity requirements, the original basin effluent weirs
were raised 1.
After passing over the effluent weirs
, the chlorinated wastewater flows over cascade aerators before discharge into the Salisbury Plain River.