Phosphate based treatment of contaminated land in jasper county missouri
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Phosphate-Based Treatment of Contaminated Land in Jasper County, Missouri. Missouri Department of Natural Resources David E. Mosby, RG [email protected] 573/751-3356. Two Separate EPA Grants. Bioavailability of Lead Contaminated Residential Soil treated using In Situ Phosphate

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Phosphate based treatment of contaminated land in jasper county missouri
Phosphate-Based Treatment of Contaminated Land in Jasper County, Missouri

  • Missouri Department of Natural Resources


Two separate epa grants
Two Separate EPA Grants County, Missouri

  • Bioavailability of Lead Contaminated Residential Soil treated using In Situ Phosphate

  • Abandoned or Former Lead/Zinc Mine Reclamation Demonstration


Residential Soil Background County, Missouri

  • 1994 lead exposure study done by the Missouri Department of Health and Senior Services

  • 14% of the children had elevated blood lead

  • 25% of the children near the smelter had

  • elevated blood lead

  • EPA began Lead Strategy - started sampling thousands of homes all

  • over Joplin


Lead County, Missouri

Contamination

in surface soils

over 800 ppm in Joplin, MO


Epa rod on residential soils
EPA ROD on Residential Soils County, Missouri

  • Excavate soil above 800 ppm Pb

  • Replace garden soils above 500 ppm Pb

  • Provide loaner HEPA Vacs

  • Soil Repository covering mill waste

  • Long-term Health Education and blood-Pb screening

  • Phosphate treatment above 500 ppm Pb, if proven effective.


PHOSPHATE TREATMENT County, MissouriWorking HypothesisAddition of phosphoric acid to Pb contaminated Joplin soil will result in formation of chloropyromorphite and reduce the Pb bioavailability and solubility.

5 Pb2+ + 3 H2PO4-+ Cl- ----> Pb5(PO4)3Cl + 6H+

log K = -25.05


Bioavailability testing using immature swine
Bioavailability Testing Using Immature Swine County, Missouri

  • Pigs fed soil + feed by hand after fasting

  • 15 pigs dosed per soil at 3 different dose ranges

  • Pigs dosed for 15 days

  • 12 Blood Pb at various times + femur, kidney, liver samples analyzed per pig

  • Bioavailability value combination of tissues, but heavily weighted toward blood-Pb


Study design
Study Design County, Missouri

I. A. Soil Characterization and Bench Treatment of Smelter Soils

I. B. Dosing of Treated and Untreated Bench Soils to

Immature Swine to Determine Bioavailability

II. A. Field Treat Soils and Characterize Pb and Distribution

II. B. Dosing of Treated and Untreated Field Treated Soils


Study Design cont. County, Missouri

III. A. Incubation of Bench Soils

III. B. Dosing of Incubated Soils

IV. Dosing of Field Soils Over Time to Pigs

V. Analyze Plant Tissue in Field Plots Over Time



Plans for implementation
Plans for Implementation County, Missouri

  • Intend to implement at ~500 residential properties in Jasper County

  • Will apply to properties with soil between 400 - 800 ppm Pb

  • Should take 3-4 days per property

  • Costs estimated between 1/2-1/3 soil removal= $4000-$5000/yard

  • MDNR hopes to implement as part of state match



Project description
Project Description County, Missouri

  • Jasper County Site

    Revegetation Using Biosolids

    Enhanced Wetland

    Close mine shafts


Barren Chat & Tailings County, Missouri


Organic amendments
Organic Amendments County, Missouri

  • Selected organic amendments from local sources were utilized.

    • Mushroom compost

    • Mizzou Doo

    • Composted chicken litter

    • Uncomposted turkey litter

    • City of Springfield composted sewage sludge

    • Topsoil

    • Soil repository


Phosphate treatment
Phosphate Treatment County, Missouri

Phosphate in organic matter

  • mushroom compost 0.36%

  • composted chicken litter 1.73%

  • turkey house litter 1-2%

  • composted sewage sludge 1.9%

Inorganic phosphate

- added 2500-5000 ppm P as TSP to highly

contaminated areas


Organic Matter Application County, Missouri


Upland Site County, Missouri1 Year Post Reclamation


Center Creek Site County, Missouri6 Months Post Reclamation


Pre post treatment sampling
Pre & Post Treatment Sampling County, Missouri

  • Storm water

  • plant tissue

  • soils/sediment

  • groundwater


Epa study on impacts of biosolids application in jasper county
EPA study on impacts of Biosolids application in Jasper County

  • Metals in worms in biosolids lower than those found in control

  • Biosolids application does not pose ecological risk



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