Chemical characterization and anaerobic biodegradability of hydrothermal liquefaction aqueous products from mixed-culture wastewater algae
2015
Tommaso, Giovana | Chen, Wan-Ting | Li, Peng | Schideman, Lance | Zhang, Yuanhui
This study examined the chemical characteristics and the anaerobic degradability of the aqueous product from hydrothermal liquefaction (HTL-ap) from the conversion of mixed-culture algal biomass grown in a wastewater treatment system. The effects of the HTL reaction times from 0 to 1.5h, and reaction temperatures from 260°C to 320°C on the anaerobic degradability of the HTL-ap were quantified using biomethane potential assays. Comparing chemical oxygen demand data for HTL-ap from different operating conditions, indicated that organic matter may partition from organic phase to aqueous phase at 320°C. Moderate lag phase and the highest cumulative methane production were observed when HTL-ap was obtained at 320°C. The longest lag phase and the smallest production rate were observed in the process fed with HTL-ap obtained at 300°C. Nevertheless, after overcoming adaptation issues, this HTL-ap led to the second highest accumulated specific methane production. Acetogenesis was identified as a possible rate-limiting pathway.
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