کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4997502 | 1459910 | 2017 | 10 صفحه PDF | دانلود رایگان |
- Microalgal biomass pretreatment by bacteria enhances liquefaction of about 18%.
- Bacterial pretreatment increases the macromolecular release considerably.
- Experimental microalgae improves the methane to 0.08Â gCOD/gCOD comparing to control.
- Methane production rate increased with hydrolysis constant of about 0.24Â dayâ1.
- A positive energy ratio of about 1.04 was achieved in experimental microalgae.
Generation of bioenergy from microalgal biomass has been a focus of interest in recent years. The recalcitrant nature of microalgal biomass owing to its high cellulose content limits methane generation. Thus, the present study investigates the effect of bacterial-based biological pretreatment on liquefaction of the microalga Chlorella vulgaris prior to anaerobic biodegradation to gain insights into energy efficient biomethanation. Liquefaction of microalgae resulted in a higher biomass stress index of about 18% in the experimental (pretreated with cellulose-secreting bacteria) vs. 11.8% in the control (non-pretreated) group. Mathematical modelling of the biomethanation studies implied that bacterial pretreatment had a greater influence on sustainable methane recovery, with a methane yield of about 0.08 (g Chemical Oxygen Demand/g Chemical Oxygen Demand), than did control pretreatment, with a yield of 0.04 (g Chemical Oxygen Demand/g Chemical Oxygen Demand). Energetic analysis of the proposed method of pretreatment showed a positive energy ratio of 1.04.
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Journal: Bioresource Technology - Volume 233, June 2017, Pages 34-43