METHANE PRODUCTIONS OF CROP RESIDUES FROM CONTAMINATED AND UNCONTAMINATED SITES

摘要

Phytoremediation is an emerging technology as a cost-effective green technology that uses plants to clean up contaminated areas. Once plants are harvested, highly contaminated crop residues must be disposed suitably. Anaerobic digestion of contaminated crop residues, which significantly reduce contaminated biomass volume and produce biogas, seems to be a reasonable alternative from a perspective of environmental impact and energy recovery potential. In consideration of energy recovery potential, BMP test using heavy metal-containing sunflower (i.e., Helianthus annuus) as crop residues collected from phytoremediation site was conducted, and the results of the test were compared to the reported methane gas production of various grass crop residues from uncontaminated site. From BMP test, 0.21 L/g VS of maximum methane production was observed. The methane productions of other grass crop residues via BMP test ranged from 0.19 to 0.38 L/g VS and could be comparable to that of sunflower.