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Biosolids Engineering

Biosolids handling and disposal is a major expense for any wastewater treatment facility. Alternatives for biosolids disposal or reuse range from land application of liquid sludge, to sludge drying and disposal, to forms of composting for re-use. Aldrich + Elliott has extensive experience in the study, design and construction of each of these sludge management options for our municipal clients.

Biosolids Processing

  • Sludge storage and odor control
  • Sludge thickening/dewatering (belt press and centrifuge)
  • Mobile dewatering
  • Anaerobic digestion
  • Sludge composting (windrow and static pile)
  • Land application

Biosolids Permitting

  • Sludge and septage plans
  • Solid waste full certifications
  • Land application permitting
Biosolids Engineering - Vermont
Johnson, VT
The first municipal windrow sludge composting facility in Vermont, dewatered sludge is mixed with sawdust and bark mulch and "cured" for 21-28 days as composting action kills the pathogens necessary for the sludge to be re-used for non-food supporting compost fertilizer.
Biosolids Engineering - Vermont
Milton, VT
>Sludge centrifuges have proven to be a cost-effective and reliable way to dewater wastewater sludge, often achieving a solids content of 22-24%. Efficiently reducing the amount of water in dewatered sludge prior to disposal is critical as sludge waste disposal is typically charged on a tonnage basis (drier sludge weighs less). Though they consume more electrical energy than a belt filter press, their higher performance often offsets the added electrical costs with lower disposal costs and more efficient operation.