Nutrient removal and energy production from aqueous phase of bio-oil generated via hydrothermal liquefaction of algae.
Removal of nutrients (phosphorus and nitrogen) as struvite from bio-oil aqueous phase generated via hydrothermal liquefaction of algae was evaluated in this study. Effect of process parameters such as pH, temperature and reaction time on struvite formation was studied. More than 99% of phosphorus and 40-100% ammonium nitrogen were removed under all experimental conditions. X-ray diffraction analysis confirmed the formation of struvite, and the struvite recovered from bio-oil aqueous phase can be used as a slow-release fertilizer. Biogas production from struvite recovered bio-oil aqueous phase showed 3.5 times higher CH4yield (182±39mL/g COD) as compared to non-struvite recovered aqueous phase. The results from this study indicate that both struvite and methane can be produced from bio-oil aqueous phase.
Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA.
Saravanan R
SR
Shanmugam
Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA. Electronic address: sushil.adhikari@auburn.edu.
Sushil
S
Adhikari
Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA.
Rajdeep
R
Shakya
D064751:Ammonium Compounds / Q000032:analysis; D000693:Anaerobiosis; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D001709:Biotechnology / Q000191:economics / Q000379:methods*; D005308:Fertilizers; D008697:Methane / Q000032:analysis; D058086:Microalgae / Q000378:metabolism*; D009584:Nitrogen / Q000302:isolation & purification*; D010710:Phosphates / Q000032:analysis; D010758:Phosphorus / Q000302:isolation & purification*; D010938:Plant Oils / Q000737:chemistry*; D000069877:Struvite / Q000032:analysis; D013696:Temperature; D062065:Wastewater / Q000737:chemistry; D014867:Water / Q000737:chemistry*
D064751:Ammonium Compounds; D056804:Biofuels; D005308:Fertilizers; D008697:Methane; D009584:Nitrogen; D010710:Phosphates; D010758:Phosphorus; D010938:Plant Oils; D000069877:Struvite; D062065:Wastewater; D014867:Water
Algae; Bio-oil aqueous phase; Hydrothermal liquefaction; Methane production; Struvite