Phytofiltration Of Anaerobically Digested Sugarcane Ethanol Stillage Using A Macrophyte With High Potential For Biofuel Production
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION(2018)
摘要
Anaerobically digested stillage (ADS) requires treatment before being discharged into water bodies or soils to avoid adverse effects. Phytofiltration systems are eco-friendly technologies for wastewater treatment, and they simultaneously serve as a source of biomass for biofuel production. The aim of the present study was to investigate the phytofiltration of ADS using Azolla sp. The effects of the ADS strength (dilutions 1:50 and 1:25 v/v) and initial biomass density (IBD) [15.44 (IBD1) and 23.16 (IBD2) g dry weight (dw) m(-2)] on plant growth and pollutant removal were assessed. Productivities obtained at ADS 1:50 (2.93 and 3.04 g m(-2) d(-1) for IBD1 and IBD2, respectively) were not significantly different from those of a synthetic medium (2.56 and 3.15 g m(-2) for IBD1 and IBD2, respectively). Higher organic matter removal was found using ADS at 1:25 than that obtained using ADS 1:50 (52.16-53.34 vs 32.29-38.16%), while no IBD effect was observed. The nutrient concentrations in ADS were reduced significantly, especially the concentrations of NH4-N (75.11-82.54%), PO4-P (88.72-92.90%) and SO4-S (55.95-66.61%). The conversion of nutrients from ADS into Azolla biomass may result in an effective way to produce an attractive feedstock for biofuel production.
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关键词
vinasse, anaerobic digestion, phytoremediation, Azolla sp
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