Monitoring and Management of Anions in Polluted Aqua Systems: Case Studies on Nitrate, Chromate, Pertechnetate and Diclofenac

The presence of sulfate and bicarbonate was reported as a major influence on the performance of the resin and the authors assigned the improved performance in some cases to the specific sulfate/chloride or bicarbonate/chloride ratios present in the system

Rana Ahmed; Philippe Moisy; Amitabh Banerji; Peter Hesemann; Andreas Taubert

2021

Scholarcy highlights

  • Over the past decades, anion toxicity has been widely recognized as a tremendous environmental and health problem
  • The current chapter focuses on four anions, two of which are “conventional” oxoanions, one radioactive and one is an organic anion
  • According to the authors “This is by far the fastest, energy efficient technology for wastewater treatment which adds to sustainability of irrigation and aquaculture and reduces dependency on synthetic fertilizers and potable water for irrigation.”
  • The article highlights two interesting aspects that extend beyond more classical adsorbents: core-shell hybrid fibers prepared by the authors show a significantly higher performance and the materials, being filters as they are, are able to remove suspended solids along with dissolved metal ions
  • Biodegradation can be enhanced using microorganisms capable to degrade DCF. These results indicate that the management of pharmaceuticals in the aquatic environment is a complex issue and further research is needed to find valuable strategies allowing for an efficient and complete transformation and/or degradation of these compounds in WWTPs and Drinking Water Treatment plants
  • To just highlight a few recent approaches, Zhang et al. used Fe-crosslinked alginate hydrogels to perform a synergistic redox reaction between Cr(VI) and As(III) resulting in Cr(III) and As(V), both of which can be removed to over 80% from aqueous solutions using the as-prepared hydrogels
  • As DCF is present in the marine environment, it was found in marine organisms such as mussels and fish. All these findings clearly indicate that continuous monitoring of DCF and other pharmaceutically active compounds and, more generally, Pharmaceutical and Personal Care Products in the aquatic environment is necessary
  • The study focuses on the role of the iron species and the polysulfide in these adsorbents and the authors propose that an electron shuttling processes between all constituents is responsible for effective Cr(VI) adsorption along with reduction of Cr(VI) to Cr(III)

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