Acid Mine Drainage AMD Tank Selection Treatment
Acid Mine Drainage (AMD; Acidic High-Iron-Sulfate AMD at pH 1.5-4.5 with Iron, Manganese, Aluminum, Sulfate, Zinc, Copper, Lead, Cadmium, Arsenic, Selenium, and Heavy-Metal Matrix from Sulfide-Mineral Oxidation at Abandoned and Active Coal, Metal-Sulfide, and Hard-Rock Mine Drainage Including Pyrite, Pyrrhotite, Marcasite, Chalcopyrite, Sphalerite, Galena, and Arsenopyrite Oxidation by Atmospheric Oxygen + Iron-Oxidizing Bacteria Acidithiobacillus ferrooxidans + Acidithiobacillus thiooxidans + Leptospirillum ferrooxidans Catalysis at Appalachian Coal Country, Pacific-Northwest, Rocky-Mountain, Southwest Hard-Rock, and Boreal Mine Districts) — Tank Selection at AMD Collection, Lime-Treatment, and Active-Treatment-Plant Service
Acid mine drainage (AMD; acidic high-iron-sulfate mine-drainage water; CAS not registered as a single substance — matrix of dissolved ferric and ferrous sulfate FeSO4 + Fe2(SO4)3 + sulfuric acid H2SO4 + manganese sulfate MnSO4 + aluminum sulfate Al2(SO4)3 + zinc sulfate ZnSO4 + copper sulfate CuSO4 + lead + cadmium + arsenic + selenium + minor heavy-metal sulfate generated by atmospheric + microbially-catalyzed oxidation of sulfide minerals (pyrite FeS2, pyrrhotite FeS, marcasite FeS2, chalcopyrite CuFeS2, sphalerite ZnS, galena PbS, arsenopyrite FeAsS, pentlandite (Fe,Ni)9S8) at abandoned and active coal-mine waste-rock + metal-sulfide-mine waste-rock + tailings-impoundment + underground-workings drainage; typical analysis pH 1.5-4.5 + 50-5000 mg/L Fe + 10-500 mg/L Mn + 5-200 mg/L Al + 200-15000 mg/L SO4 + 0.1-100 mg/L Zn + 0.1-50 mg/L Cu + 0.001-1 mg/L Pb + 0.001-0.5 mg/L Cd + 0.001-1 mg/L As + 0.001-0.5 mg/L Se + minor Co + Ni + Cr + Hg at site-specific mineralogy; specific gravity 1.00-1.05; ORP +400 to +800 mV vs Ag/AgCl; temperature 5-25C ambient ground-water temperature; supplied internally to the site at 100-50000-gpm collection-and-treatment plant operation; AMD chemistry is matrix-dependent on host-rock mineralogy + waste-rock + tailings age + climate-and-recharge regime + neutralizing-mineral availability) is the dominant acidic-iron-bearing process water at abandoned + active coal-mine + metal-sulfide-mine collection-and-treatment operations across the Appalachian coal country (West Virginia, Pennsylvania, Kentucky, Virginia, Ohio, Tennessee, Maryland), the Pacific Northwest (Idaho Coeur d'Alene district, Montana Berkeley Pit, Washington Holden Mine), the Rocky Mountains (Colorado Summitville + Eagle Mine + Leadville + Climax + California Gulch, New Mexico Molycorp), the Southwest hard-rock districts (Arizona Iron King + Lavender Pit + Iron Mountain California, Nevada Anaconda Yerington), the Boreal Shield (Sudbury Ontario + Manitoba + Quebec + Saskatchewan), and global mine-impacted regions, providing 100-50000 gpm continuous treatment-plant feed at active-treatment + passive-treatment + lime-neutralization + sulfide-precipitation + sulfate-reducing-bioreactor + constructed-wetland process configurations.
U.S. and Canadian AMD throughput is concentrated at U.S. EPA Superfund sites (Iron Mountain California, Berkeley Pit Montana, Summitville Colorado, Bunker Hill Idaho, Eagle Mine Colorado, California Gulch Colorado, Holden Mine Washington, Tar Creek Oklahoma, Picher Lead Zinc Oklahoma, Coeur d'Alene Basin Idaho), state DEP-managed reclamation sites (Pennsylvania DEP Office of Active and Abandoned Mine Operations OAAMO, West Virginia DEP Special Reclamation Fund, Kentucky DNR DAML, Virginia DMME DMLR), and active mine NPDES-permitted discharges (Newmont, Barrick, Freeport-McMoRan, KGHM, Hecla, Coeur Mining, Glencore, Vale Sudbury) plus coal-mine acid-mine-drainage Title V SMCRA reclamation operators. Lime + caustic + sulfide-reagent + flocculant + ferric-chloride + ferric-sulfate treatment chemistry is delivered from external suppliers (Carmeuse Lime + Graymont + Lhoist + Mississippi Lime + PVS Chemicals + Univar Solutions + Brenntag North America + Kemira + Polymer Ventures).
The eight sections below cite OSHA Hazard Communication 29 CFR 1910.1200 + 1910.1000 sulfuric-acid PEL + MSHA 30 CFR 56/57 + EPA Method 6010 + 6020 ICP-OES + ICP-MS metal analytical + EPA Method 9040 pH + EPA Method 9060 TOC + EPA NPDES + Surface Mining Control and Reclamation Act SMCRA Title V + 30 CFR Subchapter K coal-mine reclamation + Clean Water Act 402 + 404 + state-specific mining-discharge permit + EPA SPCC + state-specific abandoned-mine-land code + EPA RCRA Bevill exemption + EPA Superfund CERCLA + state-specific Voluntary Cleanup Program + Bureau of Land Management Mine Plan of Operations + Forest Service Plan of Operations + State Reclamation Bond + State Aquifer Protection Permit + Title V Clean Air Act fugitive-emission framework at routine operating practice at North American AMD collection-and-treatment operations.
1. Material Compatibility Matrix
Acid mine drainage at typical pH 1.5-4.5 + 50-5000 mg/L Fe + 200-15000 mg/L SO4 + heavy-metal matrix + 5-25C ambient is a moderately corrosive acidic iron-bearing process water with acid-corrosion + iron-staining + biological-fouling + cold-weather-freezing considerations on construction. HDPE + XLPE + FRP + PP + CPVC + PVC are the dominant polymeric construction materials at AMD collection + treatment-plant + reagent service. Note operating-discipline considerations: iron-staining discipline (ferric-iron-bearing AMD stains every adjacent surface within yards of the discharge or treatment-plant exhaust orange + brown; opaque pigmentation + corrosion-resistant coating + routine wash-down is mandatory at every plant component), biological-fouling discipline (Fe-oxidizing Acidithiobacillus + heterotrophic bacteria + algae form biofilm + slime + flocculent precipitate at AMD collection + transfer + treatment-plant surfaces; routine biocide treatment + mechanical-cleaning + acid-cleaning at 6-month frequency is standard), cold-weather-freeze discipline (AMD at 5-15C winter ground-water temperature is freeze-vulnerable at northern Appalachian + Rocky Mountain + Boreal Shield site; insulated jacket + heat-trace + freeze-protection-recirculation at every outdoor tank + transfer-pipe is mandatory at northern installation), and aluminum-precipitation discipline (Al(OH)3 gel precipitation at pH 5-7 forms slow-settling fluffy precipitate that complicates sludge handling + clarifier discipline at AMD treatment plant; HDS recycle ratio + lime-overdose + polymer-flocculant addition discipline manages aluminum-floc settlement).
| Material | AMD @ 5C | AMD @ 25C | Notes |
|---|---|---|---|
| HDPE rotomolded | A | A | Standard at AMD collection + lime-makedown + flocculant + reagent + adjacency service across the 1,500-10,000-gallon range; opaque-pigmented for UV protection + iron-stain hiding |
| XLPE rotomolded | A | A | Standard at AMD collection + treatment-plant adjacency service |
| Polypropylene (PP) | A | A | Standard at smaller acid-resistance specialty service |
| FRP vinyl-ester resin | A | A | Standard at larger AMD collection + treatment-plant clarifier + reaction-tank service across the 50,000-2,000,000-gallon scale |
| FRP polyester resin | B | C | Acceptable at lower-acid AMD only; not preferred at high-acid hot service |
| 304 stainless steel | C | NR | NOT recommended at AMD service due to acid + chloride + iron attack |
| 316L stainless steel | C | NR | NOT recommended at AMD treatment-plant service; acceptable at clean-water sample-station only |
| Carbon steel uncoated | NR | NR | NOT recommended; rapid acid corrosion + iron-staining |
| Carbon steel epoxy-coated | B | B | Acceptable at lower-acid AMD piping with epoxy or coal-tar-epoxy lining + cathodic protection at buried piping |
| Carbon steel rubber-lined | A | A | Standard at primary AMD collection + reaction-tank + clarifier-feed service; natural rubber or chlorobutyl liner |
| EPDM | A | A | Standard gasket + lining + pond geomembrane support material at AMD service |
| Viton (FKM) | A | A | Standard at higher-temperature AMD-pump + valve seat |
| HDPE 60-mil + 80-mil geomembrane liner | A | A | STANDARD at AMD collection-pond + sludge-pond + tailings-impoundment + treatment-plant secondary-containment liner |
| PVC Sch 80 | A | B | Standard at piping at AMD service to 50C; temperature-derated above 50C |
| CPVC Sch 80 | A | A | Preferred at higher-temperature AMD piping |
| HDPE pipe SDR 11 / SDR 17 | A | A | STANDARD at AMD collection + transfer piping + outdoor + buried application |
The dominant industrial pattern at North American + global AMD collection-and-treatment operations is HDPE 60-mil or 80-mil double-liner pond at AMD collection-pond + sludge-pond + treatment-plant secondary-containment + sludge-thickener + paste-tailings-impoundment, FRP vinyl-ester resin or rubber-lined carbon-steel construction at the larger 50,000-2,000,000-gallon AMD collection + treatment-plant clarifier-feed + lime-reaction + sulfide-precipitation + sand-filter vessel, and HDPE rotomolded tank at the 1,500-10,000-gallon lime-makedown + flocculant + sulfide-reagent + ferric-chloride-makeup + sample + analytical-lab + adjacency service. OneSource Plastics' 5-brand HDPE network (Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, Bushman) covers the typical 1,500-10,000-gallon AMD-treatment-plant adjacency specification across the standard active-treatment envelope; primary 50,000-2,000,000-gallon AMD-collection-pond + clarifier + lime-reaction-tank + sulfide-precipitation vessel typically calls FRP vinyl-ester or rubber-lined carbon-steel construction outside our HDPE 5-brand scope; we refer those specifications to qualified FRP + lined-steel tank fabricators.
2. Real-World Industrial Use Cases
Active Lime-Neutralization Treatment Plant (Dominant Use). Active AMD treatment plants neutralize 100-50000 gpm AMD feed at lime-slurry-dosed reaction tank to pH 8.5-10 + ferric-iron-oxidation by aeration + ferrous-to-ferric oxidation + clarifier sedimentation + HDS sludge recycle + filtered + discharged at NPDES outfall. Storage envelope: HDPE 60-mil + 80-mil double-liner AMD-collection-pond at 5-50 million-gallon scale; FRP vinyl-ester or rubber-lined carbon-steel reaction-tank + clarifier + sand-filter at 50,000-2,000,000-gallon scale; HDPE rotomolded tank at the lime-makedown + flocculant + sulfide-reagent + sample + analytical-lab + adjacency 1,500-10,000-gallon scale. Sites: Berkeley Pit Montana (Montana Resources Pit Water Treatment Plant treats 7-12 million-gallons-per-day at 1.0 g/L Cu + 10000 g/L SO4 + 1500 mg/L Fe + 1500 mg/L Mn + 0.001 mg/L As at lime + sulfide + clarifier process); Iron Mountain California (lime + sulfide + ferric-chloride + flocculant treatment of 50-200 gpm pH 0.5 AMD feed); Bunker Hill Central Treatment Plant Idaho (treats 5000 gpm Coeur d'Alene Basin AMD); Summitville Colorado (treats 1500 gpm pH 2.0 AMD).
Passive Treatment and Constructed Wetland. Smaller AMD source (1-100 gpm flow) uses passive treatment system with anoxic-limestone-drain ALD + open-limestone-channel + vertical-flow-pond + sulfate-reducing-bioreactor SRB + aerobic-wetland in series. Storage envelope: HDPE 60-mil double-liner constructed-wetland cell + HDPE rotomolded chemical-makeup + sample-tank at 1,500-10,000-gallon scale + earthen-bermed pond.
Sulfide-Precipitation Treatment. Selective sulfide-precipitation removes Cu + Zn + Pb + Cd at AMD treatment with sodium-sulfide NaHS or H2S gas dosing at pH 3-4 reaction tank + clarifier sedimentation. Storage envelope: FRP or rubber-lined-steel sulfide-precipitation reaction tank typically OUTSIDE HDPE scope; HDPE rotomolded sulfide-reagent makeup tank at 1,500-10,000-gallon scale within HDPE 5-brand scope.
Selenium Treatment. Coal-mine AMD selenium 0.005-0.5 mg/L Se requires biological-treatment ABMet + GE Rexnord SeMet + iron-coprecipitation + zero-valent-iron treatment to meet 0.005 mg/L NPDES limit. Storage envelope: FRP biological-reactor + sand-filter typically OUTSIDE HDPE scope; HDPE rotomolded reagent + sample tank at adjacency scale.
Reclamation Bond and Long-Term-O&M. Abandoned-mine-land AMD treatment is funded by SMCRA reclamation bond + Pennsylvania DEP Special Reclamation Fund + EPA Superfund + state Voluntary Cleanup Program with multi-decade O&M obligation. Storage envelope: low-O&M HDPE rotomolded tank at the small-flow 1,500-10,000-gallon scale is the standard specification.
3. Regulatory Framework
Surface Mining Control and Reclamation Act (SMCRA) Title V + 30 CFR Subchapter K. SMCRA Title V requires AMD prevention + control + treatment at every active and reclaimed coal mine in the United States; effluent limits per 40 CFR 434 coal-mining + 40 CFR 440 mineral-mining at 6.0-9.0 pH + 6 mg/L total iron + 4 mg/L total manganese + 70 mg/L total suspended solids monthly average. Office of Surface Mining Reclamation and Enforcement OSMRE administration at state Title V-approved DEP/DEQ.
Clean Water Act 402 + 404 + State NPDES Permit. AMD discharge to surface water requires state-specific NPDES outfall + state water-quality-criterion compliance + monitoring + reporting + Discharge Monitoring Report DMR submission framework. State-specific water-quality criterion at iron + manganese + aluminum + sulfate + heavy-metal + pH per state water-quality standard.
EPA Superfund CERCLA + State Voluntary Cleanup Program. Major abandoned-mine AMD sites are administered under EPA Superfund CERCLA framework with Record of Decision ROD + 5-year Review + EPA Region administration + state-specific Voluntary Cleanup Program for non-NPL sites. Sites include Iron Mountain California, Berkeley Pit Montana, Summitville Colorado, Bunker Hill Idaho, Eagle Mine Colorado, California Gulch Colorado, Holden Mine Washington, Tar Creek Oklahoma, Picher Lead Zinc Oklahoma, Coeur d'Alene Basin Idaho.
EPA RCRA Subtitle C Bevill Exemption. AMD + AMD treatment sludge generally qualify for Bevill exemption to RCRA Subtitle C under 40 CFR 261.4(b)(7) at most coal + metal-mining operations. AMD treatment sludge with elevated heavy-metal content may be subject to characteristic hazardous waste classification at site-specific evaluation.
OSHA 29 CFR 1910.1200 + 1910.1000 + MSHA 30 CFR 56/57. Sulfuric-acid + heavy-metal-bearing AMD worker SDS + container labeling + PPE + emergency-shower-eye-wash + acid-mist-ventilation discipline. MSHA Part 46 + Part 48 cyanide + heavy-metal worker training framework.
EPA Method 6010 + 6020 ICP-OES + ICP-MS Metal Analytical. EPA SW-846 Method 6010 + 6020 + 7470 + 7471 + 200.7 + 200.8 metal analytical for Fe + Mn + Al + Zn + Cu + Pb + Cd + As + Se + minor metal at AMD + treatment-plant-effluent + sludge sample collection.
State Aquifer Protection Permit and Reclamation Bond. State-specific aquifer-protection permit (Pennsylvania DEP Mining Act, West Virginia WVDEP Mining Act, Kentucky DNR DAML, Virginia DMME DMLR, Montana DEQ Hard-Rock Mining Reclamation, Colorado DRMS, Arizona ADEQ, Nevada NDEP, New Mexico NMED MMD) requires double-liner + leak-detection + groundwater monitoring well + closure-plan + reclamation-bond.
EPA SPCC + Title V Clean Air Act. AMD treatment-plant chemical storage requires SPCC Plan + secondary containment + leak-detection per 40 CFR 112; lime-handling fugitive-dust + acid-mist-ventilation per Title V state air permit + 40 CFR 50 NAAQS PM10 + PM2.5 framework.
4. Storage System Specification
AMD Collection Pond and Sludge Pond HDPE Geomembrane Liner. AMD collection-pond + sludge-pond + tailings-impoundment + treatment-plant-secondary-containment uses HDPE 60-mil or 80-mil double-liner construction with primary + secondary liner separated by geonet drainage layer + leak-detection sump + GCL or compacted-clay subliner per state-specific aquifer-protection permit. Liner installation by qualified geomembrane installer with electric leak-detection survey at acceptance per ASTM D7007.
Active-Treatment-Plant Reaction Tank and Clarifier (Outside HDPE Scope). Primary lime-neutralization reaction tank + clarifier + sand-filter at 50,000-2,000,000-gallon scale uses FRP vinyl-ester resin construction or rubber-lined carbon-steel construction with natural-rubber or chlorobutyl-rubber liner + 304 + 316L stainless mixer impeller + lime-slurry-dosing-pump + recycled-sludge-pump. Construction at qualified FRP or lined-steel tank fabricator with NDE inspection + holiday-test on liner. This specification is OUTSIDE OneSource Plastics' HDPE 5-brand scope; we refer those specifications to qualified FRP + lined-steel tank fabricators.
Lime-Makedown, Flocculant, Sulfide-Reagent, and Adjacency Tank (HDPE Scope). Lime-makedown + flocculant-makedown + sulfide-reagent + ferric-chloride-makeup + ferric-sulfate-makeup + sample + analytical-lab adjacency at the AMD treatment plant uses 1,500-10,000-gallon HDPE or XLPE rotomolded vertical flat-bottom or shallow-cone-bottom atmospheric tank, 1.85 specific-gravity rated, mounted on level reinforced-concrete pad with secondary containment via integral catch-basin or external concrete-bermed pad sized to 110% of largest-tank volume; 3-4 inch flanged top fill + atmospheric vent; 2-3 inch flanged bottom outlet with full-bore PVC ball valve; 18-24 inch top manway; ultrasonic level transmitter; sample valve; opaque-pigmented HDPE for UV protection at outdoor service + iron-stain hiding; freeze-protection insulation + heat-trace at northern-Appalachian + Rocky Mountain + Boreal Shield installation.
Passive-Treatment Constructed-Wetland Cell. Constructed-wetland cell + anoxic-limestone-drain + open-limestone-channel + vertical-flow-pond + sulfate-reducing-bioreactor uses HDPE 60-mil double-liner construction + earthen berm + limestone substrate + organic-substrate (compost + sawdust + wood-chip + manure + straw) + wetland-vegetation. HDPE rotomolded chemical-makeup + sample-tank at 1,500-10,000-gallon scale at the chemical-supplement input.
Sludge-Disposal and Stabilized-Tailings. AMD treatment sludge at 5-30% solids is disposed in sludge-impoundment + paste-tailings-stack + dry-stack-tailings + waste-rock-co-disposal facility per state-specific tailings code + reclamation bond.
Containment and Spill Pad. All AMD-bearing storage requires secondary containment per EPA SPCC + state-specific aquifer-protection permit; concrete-bermed pad with HDPE primary + secondary liner + leak-detection sump + acid-resistant epoxy or polyurea topcoat.
5. Field Handling Reality
Handler PPE. AMD handling: chemical-resistant Tyvek or equivalent suit at any open-system AMD work, double nitrile chemical-resistant glove at any contact, chemical splash goggles + face shield at any open-system handling, half-mask air-purifying respirator with acid-gas-cartridge at routine open-system work, supplied-air respirator at lime-makedown + sulfide-reagent + ferric-chloride work above OSHA acid-mist or H2S PEL, steel-toe boots with chemical-resistant overshoe, eye-wash station + emergency shower per OSHA 29 CFR 1910.151 within 10 seconds of work area, designated-trained AMD-treatment-plant operator.
Iron-Staining Discipline. Ferric-iron-bearing AMD stains every adjacent surface within yards of the discharge or treatment-plant exhaust orange + brown; opaque-pigmented HDPE + corrosion-resistant epoxy + polyurea coating + routine wash-down with weak-acid or oxalic-acid descaler is mandatory at every plant component. Periodic acid-cleaning of pump impeller + valve trim + clarifier launder + transfer-pipe at 6-month frequency is standard.
Biological-Fouling Discipline. Fe-oxidizing Acidithiobacillus + heterotrophic bacteria + algae form biofilm + slime + flocculent precipitate at AMD collection + transfer + treatment-plant surfaces + drives plugging + reduced flow. Routine biocide treatment with chlorine + peroxide + sodium-hypochlorite at 1-10 mg/L target + mechanical-cleaning + acid-cleaning at 6-month frequency is standard.
Cold-Weather-Freeze Discipline. AMD at 5-15C winter ground-water temperature is freeze-vulnerable at northern Appalachian + Rocky Mountain + Boreal Shield site; insulated jacket + heat-trace + freeze-protection-recirculation at every outdoor tank + transfer-pipe is mandatory at northern installation. Aboveground HDPE tank requires fiberglass-jacket insulation + electric heat-trace + circulating-pump loop discipline.
Aluminum-Floc Settlement Discipline. Al(OH)3 gel precipitation at pH 5-7 forms slow-settling fluffy precipitate that complicates sludge handling + clarifier discipline. HDS recycle ratio at 5-10:1 + lime-overdose to pH 9-10 + polymer-flocculant addition discipline manages aluminum-floc settlement; clarifier-overflow-rate at 0.3-0.5 gpm/ft2 sizing is standard.
Heavy-Metal Sludge Disposal. AMD treatment sludge at 5-30% solids is disposed in sludge-impoundment + paste-tailings-stack + dry-stack-tailings facility per state-specific tailings code. Sludge with elevated Pb + Cd + As may classify as RCRA characteristic hazardous waste at site-specific TCLP testing.
QC Sampling and Verification. Each AMD-feed + treated-effluent + sludge + outfall + groundwater-monitor sample collection: pH per EPA Method 9040, total + dissolved Fe + Mn + Al + Zn + Cu + Pb + Cd + As + Se + minor metal per EPA Method 6010 + 6020 + 200.7 + 200.8, sulfate + chloride + alkalinity, ORP, conductivity, total-suspended-solids, NPDES Discharge Monitoring Report DMR submission monthly.
Spill Response. AMD spill response: small-volume spill is contained at secondary-containment + neutralized in place with lime + sodium-hydroxide to pH 8-10 + transferred via vacuum-truck to AMD-collection-pond. Large-volume spill triggers state-agency notification + NPDES exceedance reporting + downstream water-quality sampling + remediation per state mining permit.
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