Wastewater Treatment Plant Improvements

Prior to the commencement of this project, the Town of Bristol had last upgraded its wastewater treatment plant in 1986. The Town received $5.7M from SRF funding to facilitate the upgrades.

Headworks

• Replacement of two grit removal blowers with variable speed drive units

Preliminary Treatment

• Replacement of three primary sludge pumps, piping and appurtenances and incorporation of variable speed drives and controls.
• Replacement of two primary clarifier longitudinal drives
• Demolition of a tri output primary clarifier longitudinal collector and cross collector drive and replacement with two primary clarifier longitudinal drives and a cross collector drive
• Replacement of  four longitudinal sludge collector mechanisms
• Replacement of four scum collector troughs
• Replacement of scum pit mixer, pump, piping and controls

Rotating Biological Contactors

• Replacement/upgrade of rotating biological contactor drives, electrical wiring and control systems
• Replacement of the influent and effluent weirs

Secondary Clarifiers

• Replacement of two secondary clarifier mechanisms, drives and controls
• Replacement of the baffle, launder and weirs
• Demolition and replacement of the influent manhole concrete top slab
• Installation of a weir washing system
• Replacement of two influent and two effluent sluice gates
• Replacement of scum pit mixer, pump, piping and controls
• Replacement of the two secondary sludge pumps, piping and appurtenances. The new sludge pumps incorporate variable speed drives and controls

Chlorine Contact Tank

• Replacement of two scum collector troughs
• Replacement of scum pit mixer, pump, piping and controls
• Replacement of the sodium hypochlorite distribution piping, valves and supports

Belt Filter Press Building

• Mechanical, electrical and I&C rehabilitation and improvements to two existing belt filter presses
• Replacement of the roofing system
• Replacement of the HVAC make up air units, ductwork and controls
• Miscellaneous electrical system improvements

Miscellaneous

• Replacement of a standby engine/generator including all related appurtenances, electrical, mechanical, instrumentation and control
• The installation a new supervisory control and data acquisition system
• Improvements to the site drainage system to alleviate surface water runoff into tankage