Residual organic matter and microbial respiration in bottom ash: Effects on metal leaching and eco-toxicity.
Författare
Summary, in English
A common assumption regarding the residual organic matter, in bottom ash, is that it does not represent a significant pool of organic carbon and, beyond metal-ion complexation process, it is of little consequence to evolution of ash/leachate chemistry. This article evaluates the effect of residual organic matter and associated microbial respiratory processes on leaching of toxic metals (i.e. arsenic, copper, chromium, molybdenum, nickel, lead, antimony and zinc), eco-toxicity of ash leachates. Microbial respiration was quantified with help of a respirometric test equipment OXITOP control system. The effect of microbial respiration on metal/residual organic matter leaching and eco-toxicity was quantified with the help of batch leaching tests and an eco-toxicity assay - Daphnia magna. In general, the microbial respiration process decreased the leachate pH and eco-toxicity, indicating modification of bioavailability of metal species. Furthermore, the leaching of critical metals, such as copper and chromium, decreased after the respiration in both ash types (fresh and weathered). It was concluded that microbial respiration, if harnessed properly, could enhance the stability of fresh bottom ash and may promote its reuse.
Avdelning/ar
Publiceringsår
2015
Språk
Engelska
Sidor
805-811
Publikation/Tidskrift/Serie
Waste Management & Research
Volym
33
Issue
9
Dokumenttyp
Artikel i tidskrift
Förlag
SAGE Publications
Ämne
- Environmental Engineering
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1096-3669