Evaluating toxicity of new extractants

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chemical symbol diagrams

This CMI-funded research was conducted at Idaho National Laboratory.

Achievement:
Novel complexants for improved separation of lanthanides were evaluated for potential inhibition of biological wastewater treatment.

Significance and Impact:
Identification of one structure as more problematic than the other influences direction of further separation research.

Details and Next Steps:

  • At equivalent concentrations (> 500X dilution of working concentrations), LDGA2 highly inhibitory while LDGA similar to TODGA in impacts on ammonia oxidation by Nitrosomonas europaea, model organism for N removal during wastewater treatment.
  • Will examine contribution of solvents Isopar L and Exxal-13 to inhibition by DGAs.
graph showing nitrite changes over time