PILOT TEST OF DEEP AQUIFER PERMANGANATE TREATMENT Phoenix, AZ - PowerPoint PPT Presentation

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PILOT TEST OF DEEP AQUIFER PERMANGANATE TREATMENT Phoenix, AZ

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Title: PILOT TEST OF DEEP AQUIFER PERMANGANATE TREATMENT Phoenix, AZ


1
PILOT TEST OF DEEP AQUIFER PERMANGANATE
TREATMENTPhoenix, AZ
Presented By David Abranovic P.E.
2
Presentation
  • Trichloroethene Oxidation by Permanganate
  • Site Background
  • Pilot Test Goals
  • Application Technique
  • Results
  • Conclusions

3
Trichloroethene Oxidation by Permanganate
  • Stoichiometric Mass Requirements for Oxidation
  • 2.4 lb KMnO4 / lb TCE
  • 2.2 lb NaMnO4 / lb TCE

4
Site BackgroundPilot Location
5
Site Background VOC Concentrations
TCE Up to 100 ug/l
PCE Up to 150 ug/l
1,1 DCE Up to 150 ug/l
TCA Up to 150 ug/l
6
Pilot Study Design
  • Historical groundwater concentrations were used
    to estimate stoichiometric demands from dissolved
    groundwater and absorbed soil concentrations
  • Soil oxidant demand (SOD) of matrix unknown
  • TOC ranges from 0.01 to 0.20

7
Extent of Release Near Former Dry Wells
8
Pilot Study Objectives
  • Apply the maximum mass of permanganate into the
    subsurface
  • Identify any site specific difficulty associated
    with the application of KMnO4 to site
    groundwater
  • Measure the persistence of permanganate in the
    aquifer.
  • Monitor the reduction in VOCs concentration in
    the aquifer near the application well

9
Application Mixing Methods
  • KMnO4 solution was prepared on site in two 4000
    gal storage tanks
  • Mix water was withdrawn from a nearby hydrant
  • Powdered KMnO4 was added to the mixing tanks to
    form a 3 to 4 percent KMnO4 solution.
  • The solution was then be gravity fed into
    monitoring wells MW-1A and MW-2.
  • Feed rates were 15 gpm in MW-1A and 40 gpm in
    MW-2.

10
Mixing Tank Set-Up
11
Injection Line
12
Contaminant Reduction Zone
13
Application Quantity Summary
  • Powdered KMnO4
  • 127 55 lb buckets (7,000 lb)

14
Results MW-1A - Treated Source Well
15
MW-2 Treated Source Well
16
EW-1 - 1650 Feet Down Gradient
17
MW-3 - 800 Feet Down Gradient
18
EW-2 - 1650 Feet Down Gradient
19
Chromium Results
20
Results Summary
  • VOC levels in MW-1A increased by 65.
  • VOC levels in MW-2 were reduced by 98.
  • VOC levels in MW-3 were reduced by 93.
  • KMnO4 solution migrated 1650 feet to a pumping
    well in 2 months.
  • KMnO4 solution migrated 800 feet to a monitoring
    well in 10 months.
  • KMnO4 solution persisted for over 3 years in EW-1
  • Transient elevated chromium concentrations
    observed in pilot test area.

21
Conclusions
  • Chemical oxidation by KMnO4 is potentially an
    effective remediation strategy for treatment for
    deep VOC plumes in low TOC aquifers.
  • Low TOC in soil allowed KMnO4 solution to persist
    in site groundwater for over 3 years.
  • Forced and natural gradient distribution is
    potentially a viable application method for deep
    and expansive VOC plumes.
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