Anaerobic bioleaching of metals from waste activated sludge

Roel J W Meulepas, Graciela Gonzalez-Gil, Fitfety Melese Teshager, Ayoma Witharana, Pascal Saikaly, Piet Nl L Lens

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Heavy metal contamination of anaerobically digested waste activated sludge hampers its reuse as fertilizer or soil conditioner. Conventional methods to leach metals require aeration or the addition of leaching agents. This paper investigates whether metals can be leached from waste activated sludge during the first, acidifying stage of two-stage anaerobic digestion without the supply of leaching agents. These leaching experiments were done with waste activated sludge from the Hoek van Holland municipal wastewater treatment plant (The Netherlands), which contained 342μgg-1 of copper, 487μgg-1 of lead, 793μgg-1 of zinc, 27μgg-1 of nickel and 2.3μgg-1 of cadmium. During the anaerobic acidification of 3gdry weightL-1 waste activated sludge, 80-85% of the copper, 66-69% of the lead, 87% of the zinc, 94-99% of the nickel and 73-83% of the cadmium were leached. The first stage of two-stage anaerobic digestion can thus be optimized as an anaerobic bioleaching process and produce a treated sludge (i.e., digestate) that meets the land-use standards in The Netherlands for copper, zinc, nickel and cadmium, but not for lead.
Original languageEnglish (US)
Pages (from-to)60-67
Number of pages8
JournalScience of The Total Environment
Volume514
DOIs
StatePublished - May 2015

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Environmental Engineering
  • Waste Management and Disposal

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