Phytostabilization of fly ash from a coalmine in Botswana and biovalorisation of the recovered Napier grass (Pennisetum purpureum Schumach.)
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View abstract on PubMed
Summary
This summary is machine-generated.Phytoremediation using Napier grass can clean heavy metals from fly ash. Supplementing fly ash with compost enhances both metal removal and bioethanol production, offering a sustainable waste management solution.
Area Of Science
- Environmental Science
- Biotechnology
- Agronomy
Background
- Fly ash (FA) disposal from coal power plants poses significant environmental risks to air, soil, and groundwater.
- Phytoremediation offers a sustainable approach for rehabilitating fly ash dumpsites, but biomass disposal remains a challenge.
- Valorization of phytoremediated biomass for bioenergy production can enhance the economic viability of remediation efforts.
Purpose Of The Study
- To evaluate the impact of supplementing fly ash with organic amendments (fresh sewage sludge, aged sewage sludge, food waste, compost) on Napier grass phytoremediation.
- To assess the potential of Napier grass grown in amended fly ash for bioethanol production.
- To determine the optimal amendment strategy for maximizing both heavy metal removal and bioethanol yield.
Main Methods
- Napier grass was cultivated in fly ash supplemented with various organic amendments and inorganic fertilizer (NPK).
- Heavy metal (Mn, Ni) removal efficiency from fly ash was quantified.
- Bioethanol yield was determined from the harvested Napier grass biomass.
Main Results
- Supplementation with fresh sewage sludge (FSS) and NPK fertilizer resulted in the highest removal of Manganese (1196.12 g ha⁻¹) and Nickel (128.06 g ha⁻¹).
- Napier grass grown in fly ash amended with compost (COM) and NPK yielded the highest bioethanol concentration (19.31 g L⁻¹).
- The study identified potential heavy metal accumulation in post-ethanol production byproducts, necessitating further research into waste utilization.
Conclusions
- Supplementing fly ash with organic amendments like compost can significantly enhance phytoremediation and provide a feedstock for bioethanol production.
- This integrated approach offers a dual benefit of environmental remediation and renewable energy generation.
- Further investigation into the safe utilization of byproducts, such as conversion to biochar, is crucial for a circular economy model.
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