U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Search Result

Lam, S.-M. and J.-C. Sin. | Mine Water and the Environment 38(4):757-766(2019)

Carbide lime, a byproduct of acetylene manufacturing, was characterized and compared to commercial calcium oxide (CaO) for acid mine drainage (AMD) treatment. Chemical and x-ray diffraction data revealed that the carbide lime was calcium-rich. Morphological analysis indicated it differed from commercial CaO in that it has a layered structure. Physical characterization, including nitrogen adsorption-desorption isotherm, and particle size distribution, demonstrated that the carbide lime had a greater surface area and finer particle size than the commercial CaO. Jar tests evaluated the effect of the carbide lime and CaO loading on actual AMD. The optimum quantity of carbide lime for treating the AMD was 0.4 g/L, which increased the pH and reduced the metal and sulfate concentrations to acceptable levels. The carbide lime showed superior acid-neutralizing and contaminant diminution at all studied loadings. Additionally, an Imhoff cone test confirmed that the sludge produced using carbide lime settled better than that produced using CaO powder.

The Technology Innovation News Survey welcomes your comments and suggestions, as well as information about errors for correction. Please contact Michael Adam of the U.S. EPA Office of Superfund Remediation and Technology Innovation at or (703) 603-9915 with any comments, suggestions, or corrections.

Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.