Considering energy efficiency in filtration of engineering nanoparticles

Elizabeth Arkhangelsky, Inna Levitsky, Vitaly Gitis

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Engineering nanoparticles (ENPs) are an integral part of consumer products. Released to the atmosphere or disposed to sewage, ENPs quickly penetrate to surface and ground water sources. An absence of a dedicated ENP-retaining water treatment strategy imposes a potential health threat on drinking water consumers. The threat is met by gearing up an upgrade of treatment systems towards membrane filtration that provides a better barrier to ENP penetration at higher energy costs. The current study compares the energy demand of granular and membrane filtrations, with the retention efficiency of inorganic and organic ENPs. Dedicated experiments with gold and silver nanoparticles, dyed viruses, proteins, polysaccharides, and plasmid DNA showed that the energy demand increases from slow to river bank to rapid sand filtration, and to membrane ultrafiltration (UF). The UF alone consumes on average two times more energy than the entire coagulation-flocculation- sedimentation-sand filtration tray. The differences in retention efficiency however are much less pronounced. The traditional retention tray requires 0.4-0.45 kWh per m3 of effluent (kWh/m3) to provide between 90% and 99% (1 and 2 logs) ENP retention; 1 kWh/m3 on average is needed to secure the retention of 99.9% (3 log) ENPs by UF.

Original languageEnglish
Pages (from-to)1212-1218
Number of pages7
JournalWater Science and Technology: Water Supply
Volume17
Issue number5
DOIs
Publication statusPublished - Oct 2017

Keywords

  • Bacteriophage
  • Energy-efficient filtration process
  • Gold nanoparticle
  • PES
  • PVDF

ASJC Scopus subject areas

  • Water Science and Technology

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