Hydrated lime has become an essential tool for environmental protection and remediation, addressing some of the most pressing environmental challenges facing the United States. From acid mine drainage treatment and contaminated soil remediation to biosolids stabilization and carbon capture, hydrated lime is helping to restore degraded environments and protect natural resources.

Hydrated Lime in Environmental Remediation

Acid Mine Drainage Treatment
Hydrated lime is used to neutralize acid mine drainage, a major environmental problem in coal-producing regions. Lime treatment raises pH and precipitates heavy metals, restoring water quality in impacted streams and rivers.

Contaminated Soil Remediation
Lime is used to stabilize heavy metals and organic contaminants in soils, reducing their mobility and environmental impact.

Groundwater Remediation
Lime injection is used to treat contaminated groundwater, neutralizing acidity and precipitating contaminants.

Biosolids Stabilization

Pathogen Reduction
Hydrated lime is used to treat wastewater solids (biosolids) to reduce pathogen levels and achieve compliance with regulatory requirements.

Odor Control
Lime treatment reduces odors from biosolids, improving community acceptance of land application programs.

Vector Attraction Reduction
Lime stabilization reduces the attractiveness of biosolids to disease-carrying vectors.

Regulatory Compliance
ASTM D6249 provides guidance for using hydrated lime to treat wastewater solids and achieve compliance with federal regulations (40 CFR).

Carbon Capture and Climate Mitigation

Carbon Dioxide Sequestration
Hydrated lime reacts with carbon dioxide to form calcium carbonate, offering a potential pathway for carbon capture and storage.

Soil Carbon Sequestration
Lime application to agricultural soils can enhance soil carbon storage, contributing to climate change mitigation.

Emerging Carbon Capture Applications
Emerging carbon capture applications are expected to drive future demand for hydrated lime.

Water Quality Protection

Eutrophication Control
Lime is used to precipitate phosphorus from wastewater, reducing eutrophication in receiving waters.

Heavy Metal Removal
Lime precipitates heavy metals from industrial wastewater, protecting aquatic ecosystems.

Acid Neutralization
Lime neutralizes acidic discharges from industrial and mining operations.

Environmental Benefits of Hydrated Lime

Regulatory Framework

Clean Water Act
The CWA regulates discharges of pollutants, driving demand for lime-based treatment.

Resource Conservation and Recovery Act (RCRA)
RCRA regulates hazardous waste treatment, including lime-based stabilization.

EPA Guidance
The US EPA provides guidance on the use of lime for environmental applications.

Future Outlook

Hydrated lime environmental applications are expected to grow as environmental regulations tighten and the need for remediation of contaminated sites increases. Emerging applications in carbon capture and climate mitigation offer significant growth potential.

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