Abstract
In this study, nanoscale zero-valent iron (nZVI) was modified by carboxymethylcellulose (CMC), extracellular polymeric substances (EPS) and sodium dodecyl sulfate (SDS), which were compared for the ability of hydrogen corrosion and then for the biogas upgrading during kitchen wastewater anaerobic digestion. The results showed that three nZVI composite materials addition could increase hydrogen evolution performance by 6.11∼10.30 % compared with nZVI. Especially, the hydrogen evolution from sodium dodecyl sulfate modified composite material reached 121.0 mL/g. The continuous release of hydrogen promoted the biogas yield to 510.96 mL/gVS in reaction group with SDS12-nZVI10 addition (N4), with CH4 content reached 93.37 %. Microbial community analysis showed that the total relative abundance of Methanothrix and Methanolinea was 43.60 % in N4, which was higher than other groups. It was indicated that H2-assisted biogas upgrading with nZVI composite materials addition was achievable, particularly in N4.
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