Adsorption of heavy metals on to sugar cane bagasse: improvement of adsorption capacities due to anaerobic degradation of the biosorbent.
In this work, anaerobic degradation of sugar cane bagasse was studied with a dual objective: the production of biogas and the improvement of the material's characteristics for its implementation in adsorption processes. The biogas production was determined by means of biomethane potential tests carried out over two months of incubation at 35 degrees C. Biogas and methane cumulative productions were assumed to follow a first-order rate of decay. Theoretical cumulative methane and biogas productions were calculated using Buswell's equation. The anaerobic digestion resulted in a 92% decrease in the leachable organic fraction and a 40% mass loss of bagasse. The average productions of biogas and methane from the whole set of experiments were 293 +/- 6 and 122 +/- 4 mL g(-1) of volatile solids, respectively. The anaerobic incubation of the raw material led to an increase in adsorption capacities towards metal ions, which were multiplied by around 2.0 for Zn2+ and 2.3 for Cd2+.
Joseph
Osnick
O
Civil and Environmental Engineering, INSA Lyon, LGCIE site Carnot, F-69621, France.
Rouez
Maxime
M
Métivier-Pignon
Hélène
H
Bayard
Rémy
R
Emmanuel
Evens
E
Gourdon
Rémy
R
D000327:Adsorption; D000693:Anaerobiosis; D056804:Biofuels; D002245:Carbon Dioxide / Q000378:metabolism; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism*; D055598:Chemical Phenomena; D052918:Environmental Restoration and Remediation / Q000379:methods*; D019216:Metals, Heavy / Q000737:chemistry / Q000378:metabolism*; D008697:Methane / Q000378:metabolism
D056804:Biofuels; D019216:Metals, Heavy; D002245:Carbon Dioxide; D002482:Cellulose; C027433:bagasse; D008697:Methane