Effects of Cationic Polyacrylamide and Cationic Starch on Aquatic Life

Katie L. Duggan, Martina Morris, Shobha K Bhatia, Mahmoud M. Khachan, Kate Lewis

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Geotextile tubes with polyacrylamide flocculants are widely used in dewatering applications. Due to variations in solid concentrations during dredging, excess flocculant is sometimes released into the environment, where it might have toxic effects. This study determined optimum doses for a cationic polyacrylamide (CPAM) and a natural-based polymer alternative, cationic starch (C. Starch). Slurry samples were treated with optimum and 50% overdoses of each compound, and residual polymer concentrations were measured. Overdosed C. Starch resulted in low residuals (<2 ppm), but overdosed CPAM resulted in 17.4 ppm residual polymer. The relative toxicity of CPAM and C. Starch was also tested using zebrafish embryos. 100% of embryos that had their chorion removed and 71.8% of embryos that retained their chorions were dead or dying after 7 days of exposure to CPAM. In contrast, there was no statistically significant difference in the numbers of embryos that were dead or dying when exposed to C. Starch compared with controls. These data strongly suggest that C. Starch should be considered as a replacement for CPAM in dewatering applications.

Original languageEnglish (US)
Article number04019022
JournalJournal of Hazardous, Toxic, and Radioactive Waste
Volume23
Issue number4
DOIs
StatePublished - Oct 1 2019

Keywords

  • Cationic polyacrylamide
  • Cationic starch
  • Dewatering
  • Geosynthetics
  • Geotextile tube
  • Lethality
  • Toxicity
  • Zebrafish

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Water Science and Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal

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