In the past 15 years, interest has increased in how the trace metals can be effectively supplemented to anaerobic reactors taking into account both their speciation and bioavailability. Recent studies have showed that metal sulfides play a significant role in bioavailability as they may act as a store for metals, and as a supply source in anaerobic
reactors. On the other hand, trace metal bioavailability in anaerobic digestion is also dependent on natural and synthetic chelating agents, eg. SMPs and EPS, and EDTA and NTA, respectively. However, whether these chelating agents increase or decrease trace metal bioavailability remains controversial. In addition to the popular chemical sequential extraction, analytical techniques such as WDMT, DGT, XRD, and FTIR have been applied to determine the speciation of trace metals in various
types of environmental samples; however their application to anaerobic
sludge is still in its infancy.
In the past 15 years, interest has increased in how the trace metals can be effectively supplemented to anaerobic reactors taking into account both their speciation and bioavailability. Recent studies have showed that metal sulfides play a significant role in bioavailability as they may act as a store for metals, and as a supply source in anaerobicreactors. On the other hand, trace metal bioavailability in anaerobic digestion is also dependent on natural and synthetic chelating agents, eg. SMPs and EPS, and EDTA and NTA, respectively. However, whether these chelating agents increase or decrease trace metal bioavailability remains controversial. In addition to the popular chemical sequential extraction, analytical techniques such as WDMT, DGT, XRD, and FTIR have been applied to determine the speciation of trace metals in varioustypes of environmental samples; however their application to anaerobicsludge is still in its infancy.
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