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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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Lithium removal from drinking water is challenging. Reverse osmosis (RO) effectively removed over 90% of lithium, while conventional treatments and cation exchange showed limited or inconsistent results.

Keywords:
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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Environmental Chemistry

Background:

  • Lithium (Li) is under scrutiny by the U.S. Environmental Protection Agency (EPA) as part of the Contaminant Candidate List (CCL 5).
  • Quantification of lithium in drinking water is mandated by the Unregulated Contaminant Monitoring Rule (UCMR5).
  • Limited data exists on effective methods for removing lithium from drinking water sources.

Purpose of the Study:

  • To evaluate the treatability of lithium using existing water treatment infrastructure.
  • To assess the effectiveness of various water treatment processes in removing lithium.
  • To address the data gap regarding lithium removal from drinking water.

Main Methods:

  • Evaluated 19 historical pilot- and full-scale studies on lithium removal.
  • Conducted sampling at 13 operational water treatment plants.
  • Analyzed data from 32 sites, encompassing surface and groundwater sources and 8 treatment process categories.

Main Results:

  • Conventional treatment, adsorptive media, biological treatment, and manganese filters were ineffective for lithium removal.
  • Cation exchange showed inconsistent lithium removal.
  • Lime softening removed 11%-54% of lithium, but concentrations often remained above 10 μg/L.
  • Reverse osmosis (RO) achieved >90% lithium removal, with final concentrations influenced by water blending.

Conclusions:

  • Existing water treatment infrastructure has limited effectiveness for lithium removal, with RO being the most promising technology.
  • Specific treatment processes like conventional methods, adsorptive media, and biological treatments are not suitable for lithium mitigation.
  • Further research and optimization of RO or development of new technologies may be necessary to meet potential future drinking water standards for lithium.