Ash Landfill Leachate Treatment System

Project Profile

  • Project Location : Kentucky
  • Client Industry : Client was the owner
  • Owner Industry : Utility
  • Gwtt Scope : Design / Build / Installation / Startup
  • Contract Value : $4M
  • Project Duration : 12 Months
  • Contaminants : Arsenic
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Key Project Details

  • Proceeding from a system requirements review, through a 60% and subsequent 90% design, GWTT was able to safely expedite long lead components in advance of final design substantially reducing overall project schedules.
  • Conducted bench-scale testing on source water and designed a pilot system based on the results
  • Final permanent 25 GPM system included fully automated advanced oxidation process, chemical precipitation, and filtration system
  • Treatment equipment was procured by GWTT and all mechanical work completed by GWTT
  • Startup testing and commissioning completed by GWTT
  • GWTT operated the system for the first 8 weeks post-startup and trained client personnel to take over O&M

Project Narrative

GWTT was contracted to design, build, start up, and commission a 25-GPM leachate treatment system.

Our bench-scale treatability test indicated that ozone out-performed other oxidants to convert the Arsenite into Arsenate for subsequent chemical precipitation. Arsenic in wastewater can be a challenging contaminant to remove due to having multiple oxidation states that have different solubilities and mobilities. Arsenic’s two main oxidation states in wastewater are (+3) and (+5). Arsenite (+3) is more stable in reductive environments (low ORP) and Arsenate (+5) is more stable in oxidative environments (high ORP). Arsenite is much more soluble than Arsenate and is much more difficult to remove from a waste stream. Arsenate also likes to form complexes with iron and other metals which further decrease its solubility.

A permanent treatment system was designed and approved for installation around these results and then procured and installed by GWTT.