Coal mine drainage sludge and its application for treating metallic mine effluent

Area of Science:

• Environmental Engineering
• Materials Science
• Water Treatment Technologies

Background:

• Metallic mine effluents often contain toxic heavy metals, posing significant environmental risks.
• Coal mine drainage sludge (CMDS) is an abundant industrial byproduct with potential for adsorptive applications.
• Effective and sustainable treatment methods are crucial for managing mine water pollution.

Purpose of the Study:

• To prepare and evaluate coal mine drainage sludge (CMDS) impregnated polyurethane granular composite media (PUCMDS).
• To assess the effectiveness of PUCMDS for removing arsenic and heavy metals from metallic mine effluent.
• To determine the suitability of PUCMDS for large-scale metallic mine water treatment applications.

Main Methods:

• Preparation of PUCMDS by impregnating polyurethane granular media with CMDS.
• Utilization of rapid small-scale column tests to evaluate treatment performance.
• Conducting multiple regeneration and column test cycles to assess media durability and reusability.

Main Results:

• PUCMDS demonstrated excellent performance in removing arsenic and heavy metals below regulatory limits.
• Column tests achieved high treatment capacities, exceeding 14,000 bed volumes (BVs).
• The media showed good stability and effectiveness over three regeneration cycles and four column test cycles.

Conclusions:

• PUCMDS is a highly effective and potentially sustainable material for treating arsenic and heavy metals in mine water.
• The high bed volumes achieved indicate the economic viability and practical applicability of PUCMDS.
• Further research into regeneration efficiency and long-term performance is warranted for industrial implementation.