Lee County Solid Waste Disposal Facility - Leachate Solution
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1 Lee County Solid Waste Disposal Facility - Leachate Solution Presenters: Tom Frew, PE Susan Bodmann, PG, PMP
2 Lee County Solid Waste Disposal Facility Leachate Treatment & Disposal Background Site Features Existing Treatment System Leachate Treatment Characterization Study Treatability Testing Treatment Alternatives Disposal Options Deep Injection Well Hydrogeology; Core Analyses; USDW; and Packer Testing Final Design
3 Background - Location, Location, Location SR 884 Lehigh Acres I-75 SR 82
4 Background - Leachate Sources Class I Landfill (operating 7 years) Ash residue, municipal waste, bypass waste (from Waste to Energy facility), sludge from onsite treatment Class III Landfill (operating 5 months) yard trash, construction & demolition waste, processed tires, asbestos, carpets, cardboard, paper, glass, plastic, furniture other than appliances, or other approved materials that are not expected to produce leachate which poses a threat to public health or the environment. Ash Monofill (operating 10 months) Ash residue from Waste to Energy facility
5 Background - Leachate Treatment System Existing Leachate Treatment System Consisted of: Equalization Holding Pond Chemical Coagulation and Precipitation Clarification Filtration Ultrafiltration (UF) Reverse Osmosis (RO) Percolation Ponds Off-site Disposal UF System RO System
6 Background - Treatment System Leachate Storage Ponds Clarifier/ Sand Filter Leachate Sources Master PS Trucked Disposal
7 Background - Treatment System Percolation Ponds UF System Trucked Disposal RO System
8 Leachate Treatment - Challenges Existing Treatment System Challenges: System designed to treat only the leachate from the Class I landfill Additional leachate flows from new Ash Monofill and Class III disposal sites (different water quality characteristics) Costly operation of UF/ RO processes and off-site RO concentrate disposal Potential capacity shortfalls for future flows Disposal Source Average Daily Flow 2008/09 (MGD) Peak Hourly Flow 2008/09 (MGD) Build-out Avg. Daily Flow (MGD) Build-out Peak Hourly Flow (MGD) Class I Landfill Class III Landfill Ash Monofill Total Disposal
9 Leachate Treatment - Issues Treatment Issue Specifics Only 60% recovery with RO salt rejection at 98.9% (Equates to high cost for brine disposal) High particulate load to RO (need to improve TSS removal) High TOC to RO (potential for organic fouling) Ash Landfill anticipated leachate characteristics (higher ph, metals, and sulfate)
10 Characterization - Plan & Results Sampling Plan Leachate streams (New/ Existing Sources) Intermediate streams (Treatment System) Source Sampling Results MCLs as de facto standard Class I TDS (chloride), metals and ammonia Ash Monofill TDS, sulfide, hardness and metals Class III low concentrations of metals present
11 Characterization - Results Treatment Stream Results Stage I (after clarifier and sand filter): Elevated TDS (Not designed for TDS removal) Limited metals removal (4% to 22%) Stage 2 (UF/ RO System): Good TDS removal A few parameters still exceed MCLs
12 Treatment Alternatives Existing Treatment Alternative 1 Alternative 2 Alternative 3 Alternative 4 Alternative 5 Alternative 6 Holding Ponds Holding Ponds Holding ponds Coag/Floc/ Sedimentation with FeCl3 Coag/Floc/ Sedimentation with Lime (hardness removal) Coag/Floc/ Sedimentation with Lime (hardness removal) ph adjustment (basic) Aerated Holding Ponds (Ammonia Stripping/ Nitrification) Holding Ponds Coag/ Floc./ Sedimentation with FeSO4 or Alum (ph 5 to 6) Aerated Holding Ponds Coag/ Floc/ Sedimentation with FeSO4 or Alum Holding Ponds with plants for nutrient/metal removal ( i.e. hyacinths) Coag/Floc/ Sedimentation with FeCl3 Sand Filtration UF RO Disposal to Percolation Ponds Air stripping in Tank (ammonia removal) ph adjustment (acid) Coag/Floc/ Sedimentation with FeCl3 or Alum Air stripping in Tank (ammonia removal) ph adjustment (acid) ph adjustment (neutral) Coag/Floc/ Sedimentation with FeCl3 ph Adjustment with Lime or Caustic Disposal to Deep Injection Well ph Adjustment with Lime or Caustic Disposal to Deep Injection Well ph Adjustment with Lime or Caustic Sand Filtration UF Sand Filtration UF UF RO UF RO RO Disposal to Percolation Ponds Disposal to Percolation Ponds RO Disposal to Percolation Ponds Disposal to Percolation Ponds
13 Disposal Options Class I Industrial Injection Well (IW) Co- Disposal Potential Lee County Pinewoods / Three Oaks Private Mirror Lakes (in planning stage) Nearby Class I Industrial IWs Reasonable assurances that disposal zone exists Establish hydrogeologic cross-section Class I Industrial IW disposal may not require leachate treatment
14 Disposal Options - Deep Injection Well (DIW) Leachate quality typical of other industrial wastewater streams disposed of using Class I Industrial Injection facilities Critical parameters: TSS and LSI appear to be acceptable for DIW disposal According to FDEP Treatment of leachate may not be needed prior to injection below the Underground Source of Drinking Water (USDW) where TDS concentrations are commonly greater than 30,000 mg/l
15 Disposal Options - DIW Option LEE COUNTY LHL OPTIONS No Is an existing DIW available? Is a new DIW feasible? Yes No Yes 1. Treatment option Pre & post-treatment Permeate percolation Concentrate tankering & dust suppressent in dry season 2. Disposal option Pre-treatment? Disposal in new DIW No Yes 3. Pipeline & Disposal option Pre-treatment PS & Pipeline Disposal in existing DIW
16 Disposal Options - DIW Design Class I, Class III and Ash Monofill Leachate Disposal Leachate is not classified as a Hazardous Waste as defined by RCRA standards Verified based on Primary and Secondary drinking water standards analysis of the waste stream conducted within 1-year after construction permit issuance 0.5 MGD design disposal capacity Nominal 7-inch diameter fiberglass injection tubing was determined to be the smallest cost-effective design 6.21-inch inside diameter of this tubing allows 1.36 MGD at 10 feet per second Trucking and onsite storage for backup disposal
17 Hydrogeology - Cross Section Locations
18 Hydrogeology - North-South Cross Section
19 Hydrogeology - West-East Cross Section
20 Hydrogeology - Anticipated/ Actual Formation Lehigh Acres IW (feet) Anticipated LCSWF IW-1 (feet) Actual LCSWF IW-1 (feet) Immokalee WSD-IW (feet) Pliocene-Pleistocene Hawthorn Group Suwannee Limestone Ocala Limestone 1,110 1,107 1,105 Avon Park Formation 1,470 1,455 1,440 Oldsmar Formation 2,160 2,155 2,150 Cedar Keys not encountered unknown not encountered Additional Information Base of USDW 1,700 1,830 1,960 Boulder Zone Not identified unknown Final Casing Depth 2,370 2,365 2,983
21
22 Core Analyses Confinement Tested Interval (feet bls) Vertical Hydraulic Conductivity (cm/sc) Horizontal Hydraulic Conductivity (cm/sc) 1, , x x , , x x 10-5 Core Interval (feet bls) Core Recovery ( % ) 1,678 1, ,946 1, ,982 1, ,025 2, ,102 2, ,176 2, ,230 2, , , x x , , x x , , x x , , x x , , x x , , x x , , x x , , x x , , x x , , x x , , x x ,279 2, ,416 2, , , x x x 10-6 Upper 1,813-1,868 Feet bls Lower 2,022-2,080 Feet bls Injection Zone 2,391-3,280 Feet bls 2, , x x x , , x 10-8 Not Reported
23 USDW Identification USDW 1,810 Feet bls <10,000 mg/l TDS USDW 1,810 Feet bls >10,000 mg/l TDS
24 Packer Testing Aquifer Yield Packer Test Interval (feet bls) Pump Rate (gpm) Max Drawdown (feet) Specific Capacity (gpm/foot) Avg. Transmissivity (gallons/day/foot) 1,594 1, ,691 1, ,106 1,719 1, Upper Monitor Zone 1,879 1, ,993 2, ,013 2, Lower Monitor Zone 2,197 2,
25 Packer Testing Water Quality Packer Test Interval (feet bls) Conductivity (µs/cm) Chloride (mg/l) TDS (mg/l) Ammonia (mg/l) TKN (mg/l Sulfate (mg/l) ph (SU) 1,594 1,635 5,160 1,460 2, ,691 1,738 10,700 4,720 7, USDW 1,810 Feet bls 1,719 1,759 7,910 2,300 4, , Upper Monitor Zone 1,879 1,945 31,100 11,400 19, , ,993 2,012 36,300 13,200 27, , ,013 2,030 45,400 18,500 32, , Lower Monitor Zone 2,197 2,214 53,000 19,100 40, ,
26 Final Design - DIW and DZMW
27 Final Design - Injection Testing
28 Final Design - Injectate Pond/ DIW Disposal System TO INJECTATE POND DZMW-1 IW-1
29 Injection Well Dual-Zone Monitor Well New Injectate Collection Pond
30 THANK YOU FOR LISTENING and Please be safe!
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