Influence of biofilms on heavy metal immobilization in sustainable urban drainage systems (SuDS)

Marnie Feder, Vernon Phoenix, Sarah Haig, William Sloan, Caetano Dorea, Heather Haynes

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper physically and numerically models the influence of biofilms on heavy metal removal in a gravel filter. Experimental flow columns were constructed to determine the removal of Cu, Pb and Zn by gabbro and dolomite gravel lithologies with and without natural biofilm from sustainable urban drainage systems (SuDS). Breakthrough experiments showed that, whilst abiotic gravel filters removed up to 51% of metals, those with biofilms enhanced heavy metal removal by up to a further 29%, with Cu removal illustrating the greatest response to biofilm growth. An advection-diffusion equation successfully modelled metal tracer transport within biofilm columns. This model yielded a permanent loss term (k) for metal tracers of between 0.01 and 1.05, correlating well with measured data from breakthrough experiments. Additional 16S rRNA clone library analysis of the biofilm indicated strong sensitivity of bacterial community composition to the lithology of the filter medium, with gabbro filters displaying Proteobacteria dominance (54%) and dolomite columns showing Cyanobacteria dominance (47%).

Original languageEnglish
Pages (from-to)2803-2814
Number of pages12
JournalEnvironmental Technology
Volume36
Issue number21
Early online date8 Jun 2015
DOIs
Publication statusPublished - 2 Nov 2015
Externally publishedYes

Keywords

  • advection-diffusion
  • biofilm
  • gravel filtration
  • metals
  • SuDS

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