Environmental assessment of residues generated after consecutive acid-base pretreatment of sugarcane bagasse by advanced oxidative process

Sustainable Chemical Processes

Ivy dos Santos Oliveira²  Anuj K Chandel²  Messias Borges Silva¹  Silvio Silvério da Silva² 

[1] Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, Lorena 12.602.810, Brazil

[2] Department of Biotechnology, Engineering School of Lorena, University of São Paulo, Estrada Municipal do Campinho, P.O. Box, Lorena/SP 116 12.602.810, Brazil

关键词: Taguchi experimental design;    Total organic carbon;    Total phenolics;    Photo-Fenton reaction;    Advance oxidative process;    Environment assessment;    Sugarcane bagasse;   

Others  :  789174
DOI  :  10.1186/2043-7129-1-20

 received in 2013-05-31, accepted in 2013-09-03,  发布年份 2013

【 摘 要 】

Background

Biofuels produced from sugarcane bagasse (SB) have shown promising results as a suitable alternative of gasoline. Biofuels provide unique, strategic, environmental and socio-economic benefits. However, production of biofuels from SB has negative impact on environment due to the use of harsh chemicals during pretreatment. Consecutive sulfuric acid-sodium hydroxide pretreatment of SB is an effective process which eventually ameliorates the accessibility of cellulase towards cellulose for the sugars production. Alkaline hydrolysate of SB is black liquor containing high amount of dissolved lignin.

Results

This work evaluates the environmental impact of residues generated during the consecutive acid-base pretreatment of SB. Advanced oxidative process (AOP) was used based on photo-Fenton reaction mechanism (Fenton Reagent/UV). Experiments were performed in batch mode following factorial design L₉ (Taguchi orthogonal array design of experiments), considering the three operation variables: temperature (°C), pH, Fenton Reagent (Fe²⁺/H₂O₂) + ultraviolet. Reduction of total phenolics (TP) and total organic carbon (TOC) were responsive variables. Among the tested conditions, experiment 7 (temperature, 35°C; pH, 2.5; Fenton reagent, 144 ml H₂O₂+153 ml Fe²⁺; UV, 16W) revealed the maximum reduction in TP (98.65%) and TOC (95.73%). Parameters such as chemical oxygen demand (COD), biochemical oxygen demand (BOD), BOD/COD ratio, color intensity and turbidity also showed a significant change in AOP mediated lignin solution than the native alkaline hydrolysate.

Conclusion

AOP based on Fenton Reagent/UV reaction mechanism showed efficient removal of TP and TOC from sugarcane bagasse alkaline hydrolysate (lignin solution). To the best of our knowledge, this is the first report on statistical optimization of the removal of TP and TOC from sugarcane bagasse alkaline hydrolysate employing Fenton reagent mediated AOP process.

【 授权许可】

   
2013 Oliveira et al.; licensee Chemistry Central Ltd.

【 图 表 】

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