Use of Sugarcane Bagasse as Carbon Substrate in Permeable Reactive Barriers: Laboratory Batch Tests and Mathematical Modeling

Autor(es)

Mattos, R. C. ^[1] ; Hemsi, P. S. ^[1] ; Kawachi, E. Y. ^[1] ; Silva, F. T. ^[2]

Afiliação do(s) autor(es)

^[1] Inst Tecnol Aeronaut, Praca Mal Eduardo Gomes 50, Sao Jose Dos Campos, SP - Brazil

^[2] Univ Sao Paulo, Escola Engn Lorena, Lorena, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SOILS AND ROCKS; v. 38, n. 3, p. 219-229, SEP-DEC 2015.
• Citações Web of Science: 2

Resumo

The combination of the lignocellulosic residue sugarcane bagasse and poultry litter as carbon and nutrients sources, respectively, in organic permeable reactive barriers for remediation of metal laden acid mine drainage has not yet been extensively tested and may be promising based on chemical composition. This system is being tested in the laboratory by means of microcosm batch experiments using sugarcane bagasse with and without poultry-litter as nitrogen and phosphorous source. As expected based on the compositions of sugarcane bagasse and poultry litter, the experiments (duplicate) combining both residues achieved the highest rates of sulfate reduction, between similar to 30 to 45 mg sulfate/L-day, and better sustained these rates throughout the duration of the experiment (78 days). Also, pH values increased from similar to 6 to 8, and the oxidation-reduction potential achieved <-100 mV, indicating anaerobic sulfate-reducing conditions. Mathematical modeling performed on these experiments, with a previously-tested model, resulted in simulated results that approached the experimental data when the sugarcane bagasse was modeled as comprising a cellulose fraction with a Contois specific degradation rate similar to that for wood chips and leaf mulch, plus an additional easily-degradable fraction to account for the occurrence of soluble sugars in sugarcane bagasse. (AU)

• Processo FAPESP: 12/08797-2 - Utilização do bagaço de cana-de-açúcar na remediação ambiental de drenagem ácida de mineração
• Beneficiário: Paulo Scarano Hemsi
• Modalidade de apoio: Auxílio à Pesquisa - Regular