Removal of heavy metals from aqueous solution by biochars derived from anaerobically digested biomass

► Biochars from anaerobically digested biomass effectively removed heavy metals. ► Lead sorption capacities of the biochars were close to or higher than 200mmol/kg. ► Surface precipitation was the governing heavy metal removal mechanism. This study examined the ability of two biochars converted from...

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Published inBioresource technology Vol. 110; pp. 50 - 56
Main Authors Inyang, Mandu, Gao, Bin, Yao, Ying, Xue, Yingwen, Zimmerman, Andrew R., Pullammanappallil, Pratap, Cao, Xinde
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 01.04.2012
Subjects
activated carbon
Anaerobic digestion
Anaerobiosis
aqueous solutions
Biochar
Biomass
dairies
Fourier transform infrared spectroscopy
Heavy metal
heavy metals
isolation & purification
Kinetics
lead
mathematical models
Metals, Heavy
Metals, Heavy - isolation & purification
Solutions
Sorption
sugar beet
Wastewater
Water
Sorption
Biochar
Wastewater
Anaerobic digestion
Heavy metal
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Summary:► Biochars from anaerobically digested biomass effectively removed heavy metals. ► Lead sorption capacities of the biochars were close to or higher than 200mmol/kg. ► Surface precipitation was the governing heavy metal removal mechanism. This study examined the ability of two biochars converted from anaerobically digested biomass to sorb heavy metals using a range of laboratory sorption and characterization experiments. Initial evaluation of DAWC (digested dairy waste biochar) and DWSBC (digested whole sugar beet biochar) showed that both biochars were effective in removing a mixture of four heavy metals (Pb2 +, Cu2+, Ni2+, and Cd2+) from aqueous solutions. Compared to DAWC, DWSBC demonstrated a better ability to remove Ni and Cd. Further investigations of lead sorption by the two biochars indicated that the removal was mainly through a surface precipitation mechanism, which was confirmed by batch sorption experiments, mathematical modeling, and examinations of lead-laden biochars samples using SEM–EDS, XRD, and FTIR. The lead sorption capacity of the two biochars was close to or higher than 200mmol/kg, which is comparable to that of commercial activated carbons.
Bibliography:http://dx.doi.org/10.1016/j.biortech.2012.01.072
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ISSN:0960-8524
1873-2976
1873-2976
DOI:10.1016/j.biortech.2012.01.072