Anaerobic digestion of mercury phytoextraction crops with intermediary stage bio-waste polymer treatment

In laboratory experiments, Lepidium sativum L. and Mentha spicata L. were grown in compost spiked with mercury. After cultivation for 20 and 68 days, respectively, translocation factors of 0.05 ≤ TF ≤ 0.2 (Lepidium sativum) and accumulation factors of 2.2 ≤ AF ≤ 12 (Mentha spicata) were recorded. Pl...

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Bibliographic Details
Published in:International journal of phytoremediation 2020-11, Vol.22 (13), p.1431-1439
Main Authors: Rollinson, Andrew N., Bhuptani, Jayshree, Beyer, Jeffrey, Ismawati, Yuyun, Radu, Tanja
Format: Article
Language:English
Subjects:
Alternative energy sources
Anaerobic digestion
Biogas
Bioreactors
Canola oil
canola oil polysulfide polymer
Composts
Continuously stirred tank reactors
Crops
Cultivation
Environmental cleanup
Experimentation
Lepidium sativum
Mentha spicata
Mercury
Mercury (metal)
Phytoremediation
Polymers
Reactors
Refuse as fuel
Renewable energy
Sludge
Sludge digestion
Sulfides
Toxicity
Translocation
Waste disposal
Waste treatment
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Summary:In laboratory experiments, Lepidium sativum L. and Mentha spicata L. were grown in compost spiked with mercury. After cultivation for 20 and 68 days, respectively, translocation factors of 0.05 ≤ TF ≤ 0.2 (Lepidium sativum) and accumulation factors of 2.2 ≤ AF ≤ 12 (Mentha spicata) were recorded. Plants were then harvested and used as feedstock for bench-scale anaerobic digesters. The reactors operated in continuously-stirred batch mode for a period of ten days. Inhibition of anaerobic biogas production was apparent with one sample set evidencing mercury-induced bacteriostatic toxicity. Otherwise, ex-situ characterization of digestate showed that the reactors were within stable operating range. A canola oil-sulphide polymer derived from bio-waste was also used as an intermediary treatment stage to test its capacity for extracting mercury from half the samples prior to anaerobic digestion, and also from the post-experimentation reactor digestate. The polymer removed mercury from digestate with a 40-50% efficacy across all samples, suggesting its potential as a sludge clean-up option. Anaerobic digestion combined with staged polymer extraction offers a potential route for the disposal of phytoremediation crops and ultimately the recovery of mercury, coincident with the production of a bioenergy vector.
ISSN:1522-6514
1549-7879
DOI:10.1080/15226514.2020.1781781