Journal
BIORESOURCE TECHNOLOGY
Volume 247, Issue -, Pages 660-668Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.09.146
Keywords
Anaerobic digestion; Chicken manure; Methane yield; Heavy metals speciation; Risk assessment
Funding
- National Water Pollution and Treatment Project in China [2015ZX07203005]
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In this study, the potential ecological risk of heavy metals (Mn, Zn, Cu, Ni, As, Cd, Pb, Cr) accumulation from anaerobic co-digestion of chicken manure (CM) and corn stover (CS) was evaluated by comparing different initial substrate concentrations, digestion temperatures, and mixture ratios. Results showed that the highest volumetric methane yield of 20.3 +/- 1.4 L/L-reactor was achieved with a CS: CM ratio of 3: 1 (on volatile solid basis) in mesophilic solid state anaerobic digestion (SS-AD). Although co-digestion increased the concentrations of all tested heavy metals and the direct toxicity of some heavy metals, the potential ecological risk index indicated that the digestates were all classified as low ecological risk. The biogasification and risk variation of heavy metals were affected by the operating parameters. These results are significant and should be taken into consideration when optimizing co-digestion of animal manure and crop residues during full-scale projects.
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