Lanthanum-modified bentonite: potential for efficient removal of phosphates from fishpond effluents

Eyal Kurzbaum, Yasmin Raizner, Oded Cohen, Guy Rubinstein, Oded Bar Shalom

Research output: Contribution to journalArticlepeer-review


Adsorption has been suggested as an effective method for removing phosphates from agricultural wastewater effluents that contain relatively high phosphate concentrations. The present study focused on the use of a bentonite-lanthanum clay (Phoslock®) for reducing the dissolved phosphate concentration in fishpond effluents. Batch experiments with synthetic phosphate-spiked solutions and with fishpond effluents were performed in order to determine adsorption equilibrium isotherms and kinetics as well as to determine the efficiency of Phoslock® in removing phosphate from these solutions. In the synthetic phosphate-spiked solution, the mean maximum phosphate adsorption capacity was 92 mg Phoslock®/mg phosphate removal. A ratio of 50, 100, and 200 mg Phoslock®/mg phosphate removal was found for complete phosphate removal from the fishpond effluents, where higher doses of Phoslock® led to a faster removal rate (94% removal within the first 150 min). These results show that bentonite-lanthanum clay can be employed for designing a treatment process for efficient phosphate removal from fishpond effluents.

Original languageEnglish
Pages (from-to)15182-15186
Number of pages5
JournalEnvironmental Science and Pollution Research
Issue number17
StatePublished - 1 Jun 2017

Bibliographical note

Publisher Copyright:
© 2017, Springer-Verlag Berlin Heidelberg.


  • Adsorption
  • Aquaculture
  • Fishpond
  • Phoslock
  • Phosphate
  • Water treatment

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis


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