Insight on how biopolymers recovered from aerobic granular wastewater sludge can reduce the flammability of synthetic polymers

Nam Kyeun Kim, Richard Lin, Debes Bhattacharyya, Mark C.M. van Loosdrecht, Yuemei Lin

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Eco-friendly flame retardants are greatly required to meet the expectations of low-toxicity, environmental compatibility and sustainability. Extracellular polymeric substances (EPS), the biopolymers recovered from excess granular wastewater sludge, have been successfully incorporated into poly(vinyl alcohol) (PVA) by a solution casting method. Self-extinguishment of EPS was observed in a vertical burn test. Positive effects of EPS on the reduction of heat release rate and CO emission of EPS/PVA composites were also demonstrated. The presence of various types of phosphates was detected in the EPS and a possible flame-retardant mechanism has been proposed. The investigation of using granular sludge EPS to reduce the flammability of synthetic polymers may open the possibility of converting wastewater sludge into bio phosphorus-based flame retardants.

Original languageEnglish
Article number150434
Number of pages7
JournalScience of the Total Environment
Volume805
DOIs
Publication statusPublished - 2022

Keywords

  • Biomaterials
  • Extracellular polymeric substances
  • Flame retardants
  • Phosphorus
  • Wastewater sludge management

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