August 2016

The Process of Removing a Digester Tank Lid

2016-08-24T11:01:29-04:00August 24th, 2016|Client Service, Project News, Safety|

It’s not every day a wastewater treatment plant project requires the replacement of a digester tank lid. What makes this feat so impressive? The lid itself is 50-feet in diameter and weighs about 77,000 pounds, which required a 210-ton crane to lift. During the lift, it looked like there was a UFO hovering over the property.

Why did the tank lid need to be removed in the first place? A hole had developed on the underside of the lid, thus allowing the hollow lid to be filled with sludge. The tank will receive a new membrane-style cover during Phase II of the project.

The overall project for Phase I involves the following:

  • New chlorine contact basin on the end of the existing equalization tanks.
  • New chemical building for feed of sodium hypochlorite and sodium bisulfite to the new chlorine contact basin.
  • New aeration basin #7.
  • Renovation of the sludge control building, including all new sludge heating equipment.
  • New ultraviolet disinfection building including a new non-potable water system and new effluent aeration system.
  • New pump station to handle the centrate from the existing sludge dewatering building.
  • New electrical service and electrical feeds to all buildings.
  • Various site piping.

All work is being completed while protecting and maintaining the continuous operations of the facility. The $12 million project will be complete in summer 2017.