Effects of Solid Content and Substrate Concentration on Bioleaching of Heavy Metals from Sewage Sludge Using Aspergillus niger

The presence of heavy metals in sewage sludge not only affects the performance of sludge anaerobic digestion process but also restricts the land application of treated sewage sludge. Therefore, a fungi-mediated bioleaching process for simultaneous metal leaching and sludge digestion by Aspergillus n...

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Bibliographic Details
Published in:Metals (Basel ) 2019-09, Vol.9 (9), p.994
Main Authors: Chen, Shen-Yi, Wang, Sheng-Ying
Format: Article
Language:English
Subjects:
Acids
Anaerobic digestion
Anaerobic processes
Aspergillus niger
Bacteria
Bacterial leaching
bioleaching
Efficiency
Fungi
heavy metal
Heavy metals
Landfill
Leaching
Lead
Manganese
Metabolism
Metals
Microorganisms
Nickel
Reaction time
Sewage sludge
Sludge
Sludge digestion
solid content
Solubilization
Substrates
Sucrose
Treated sewage
Zinc
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Summary:The presence of heavy metals in sewage sludge not only affects the performance of sludge anaerobic digestion process but also restricts the land application of treated sewage sludge. Therefore, a fungi-mediated bioleaching process for simultaneous metal leaching and sludge digestion by Aspergillus niger was developed to treat the sewage sludge containing heavy metals in this study. The effects of two important parameters, sludge solid content and substrate (sucrose) concentration, on the performance of fungal bioleaching were investigated in this study. The results showed that the rate of pH reduction increased with increasing sludge solid contents and sucrose concentrations. In this study, the efficiency of metal removal decreases in the order of Mn > Zn > Ni > Pb. The efficiencies of metal leaching and solid degradation (SS and VSS) were found to be decreased with an increase of sludge solid content and a decrease of sucrose concentration. At 2 days of reaction time, the maximum efficiency of metal solubilization was 95, 56, 21 and 13% for Mn, Zn, Ni and Pb, respectively.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9090994