The Linden WWTP, which serves Linden, Michigan and surrounding area, is being expanded from 7 MGD to 11 MGD capacity.  The existing solids handling facility was expanded to handle the additional solids loading.  Also, due to the close proximity of residential development, the current land application process requires an unacceptable volume of truck traffic from the neighborhood and produces unacceptable odors when stored sludge is removed from the storage tanks.  HRC evaluated and recommended improvements to the solids handling system.  In addition to expansion of the current solids handling system, HRC investigated various solids thickening systems for disposal of the solids to the landfill.  Belt presses, centrifuges, and rotary presses were evaluated and a pilot study was conducted to select the most cost-effective and socially acceptable disposal system for the Linden WWTP.

The selected alternative, which will be used in conjunction with the current anaerobic digestion and land application process will be solids dewatering using centrifuges.  The solids handling system consists of a new building to house the centrifuge system, solids conveyance system, and dewatered sludge cake storage facilities and automatic roll off container handling system.

HRC provided a new granular carbon odor control system for both the solids handling building and sludge storage tanks.

For the GCDC Ragnone Treatment Plant, HRC has provided a detailed solids handling pilot study and alterations evaluation for improvements to the existing line stabilization and land application system.  The alternatives which were evaluated included belt filter presses, rotary presses, and centrifuge dewatering of line stabilized sludge for disposal by land application or landfill.  Landfill disposal will not require the addition of lime.