What question did this study set out to answer?

To systematically evaluate the chemical speciation, phase transformation, and environmental mobility of copper, zinc, and chromium in sewage sludge subjected to anaerobic digestion coupled with pre- or interstage hydrothermal treatment.

January 19, 2021Environmental Science & TechnologyOpen Access

Transformation and Mobility of Cu, Zn, and Cr in Sewage Sludge during Anaerobic Digestion with Pre- or Interstage Hydrothermal Treatment

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To systematically evaluate the chemical speciation, phase transformation, and environmental mobility of copper, zinc, and chromium in sewage sludge subjected to anaerobic digestion coupled with pre- or interstage hydrothermal treatment.
Evaluated two combined treatment configurations: pre-stage hydrothermal treatment followed by anaerobic digestion (HT-AD) and interstage hydrothermal treatment between digestion phases (AD-HT-AD).
Characterized metal mobility, binding phases, and molecular speciation in hydrochars and digestion solids using complementary sequential chemical extraction and X-ray absorption spectroscopy.
Hydrothermal treatment promoted the formation of copper and zinc sulfides in hydrochars, with subsequent anaerobic digestion driving copper toward Cu2S and partially converting nanoscale ZnS into adsorbed and organo-complexed zinc species.
Chromium selectively partitioned into stable Cr-bearing silicates within hydrochars, whereas Fe(III)-Cr(III)-hydroxide and Cr(III)-humic complexes served as the dominant species in anaerobic digestion solids.
The AD-HT-AD configuration exhibited reaction pathways similar to HT-AD, though initial anaerobic digestion altered the sludge matrix and induced minor differences in metal distributions.

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Implication

Experimental study reveals chemical shifts of copper, zinc, and chromium in sewage sludge during hydrothermal-coupled digestion, highlighting pathways governing metal mobility for safer disposal.

Cite This Study

Wang et al. (2021) studied this question.

synapsesocial.com/papers/6a816d56e6814737203c1ebd https://doi.org/10.1021/acs.est.0c05164

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Implication

Experimental study reveals chemical shifts of copper, zinc, and chromium in sewage sludge during hydrothermal-coupled digestion, highlighting pathways governing metal mobility for safer disposal.

Transformation and Mobility of Cu, Zn, and Cr in Sewage Sludge during Anaerobic Digestion with Pre- or Interstage Hydrothermal Treatment

Key Points

Discussion

Implication

Cite This Study

Transformation and Mobility of Cu, Zn, and Cr in Sewage Sludge during Anaerobic Digestion with Pre- or Interstage Hydrothermal Treatment

Key Points

Discussion

Implication

Cite This Study