Entity

Time filter

Source Type


Eboibi B.E.,University of Adelaide | Eboibi B.E.,Delta State University | Lewis D.M.,University of Adelaide | Lewis D.M.,Muradel Pty Ltd Australia | And 2 more authors.
Environmental Progress and Sustainable Energy | Year: 2015

The combination of anaerobic digestion and hydrothermal liquefaction can provide enhanced energy production from animal wastes such as cow manure. Hydrothermal liquefaction (HTL) of anaerobic digestate is a novel approach for waste management to recover residual carbon Anaerobic digestion of cow manure was conducted at room temperature with different hydraulic retention times (HRT) viz. 10, 18, 28, 38, 50 and 60 days. The digested cow manure (16%w/w dry weight solids) obtained from various HRTs was subjected to hydrothermal liquefaction at 350°C, 18MPa for a fixed reaction time of 30 min in the presence of 5 wt % Na2CO3. The results showed cumulative biogas production in the range of 3.9-22.6 m3/kgVSadded. HTL of the resultant digestates led to ∼20-42 wt % biocrude yield. The biocrude has a higher heating value (HHV) of 28.4-31.2 MJ/kg. About 76% energy, ∼51-83% carbon and ∼2-4% nitrogen was recovered in the biocrude following HTL of the digestates. A positive energy balance was achieved for the products derived from the combination of anaerobic digestion and hydrothermal liquefaction. © 2015 American Institute of Chemical Engineers Environ Prog. Source


Eboibi B.E.O.,University of Adelaide | Lewis D.M.,University of Adelaide | Lewis D.M.,Muradel Pty Ltd | Ashman P.J.,University of Adelaide | Chinnasamy S.,Aban Infrastructure Pvt. Ltd
Bioresource Technology | Year: 2014

This paper proposes a two-part process for producing biocrude with reduced impurities. The biocrude was produced from hydrothermal liquefaction (HTL) of Spirulina sp. and Tetraselmis sp. in a batch reactor at both 300 and 350. °C, 5. min, and 16%. w/w solid feed composition. The resultant biocrudes were vacuum distilled at a maximum temperature of 360. °C. It was shown that biocrude quality could be enhanced without using catalyst by vacuum distillation (VD). The biocrude yield for Spirulina sp. was 36. wt% at 300. °C, 42. wt% at 350. °C, and for Tetraselmis sp. was 34. wt% at 300. °C, and 58. wt% at 350. °C. VD of Spirulina sp. biocrude obtained at 300 and 350. °C led to 62 and 67. wt% distilled biocrudes yield, respectively. VD of Tetraselmis sp. biocrude obtained at 300. °C was 70. wt%, and 73. wt% at 350. °C. The higher heating values (HHV) increased from 32. MJ/kg to 40. MJ/kg. There were substantial reductions in oxygen, metallic content, and boiling point ranges in distilled biocrudes. © 2014 Elsevier Ltd. Source


Eboibi B.E.,University of Adelaide | Lewis D.M.,University of Adelaide | Lewis D.M.,Muradel Pty Ltd | Ashman P.J.,University of Adelaide | Chinnasamy S.,Aban Infrastructure Pvt. Ltd
Bioresource Technology | Year: 2014

The biomass of halophytic microalga Tetrasel mis sp. with 16%. w/w solids was converted into biocrude by a hydrothermal liquefaction (HTL) process in a batch reactor at different temperatures (310, 330, 350 and 370. °C) and reaction times (5, 15, 30, 45 and 60. min). The biocrude yield, elemental composition, energy density and severity parameter obtained at various reaction conditions were used to predict the optimum condition for maximum recovery of biocrude with improved quality. This study clearly indicated that the operating condition for obtaining maximum biocrude yield and ideal quality biocrude for refining were different. A maximum biocrude yield of ~65. wt% ash free dry weight (AFDW) was obtained at 350. °C and 5. min, with a severity parameter and energy density of 5.21 and ~35. MJ/kg, respectively. The treatment with 45. min reaction time recorded ~62. wt% (AFDW) yield of biocrude with and energy density of ~39. MJ/kg and higher severity parameter of 7.53. © 2014 Elsevier Ltd. Source


Viswanathan T.,University of Georgia | Mani S.,University of Georgia | Das K.C.,University of Georgia | Chinnasamy S.,Aban Infrastructure Pvt. Ltd | And 3 more authors.
Bioresource Technology | Year: 2012

This paper investigated the effect of cell rupturing methods on the drying characteristics and the lipid compositions of a green algae consortium grown in an open raceway pond. The ruptured microalgae samples obtained from French press, autoclave and sonication methods were used for conducting thin layer drying experiment at four drying temperatures (30, 50, 70 and 90°C). The rate of moisture removal at each drying condition was recorded until no change in moisture loss. A typical drying curve for a microalgae consortium indicated that the rate of drying was limited by diffusion. Among three drying models (Newton, Page and Henderson-Pabis) used to fit the drying data, Page model fitted well on the experimental drying data with a coefficient of determination (R 2) of 0.99. Solvent extraction of French press ruptured cells produced the highest total lipid yield with no significant change in lipid compositions. © 2012 Elsevier Ltd. Source


Eboibi B.E.,University of Adelaide | Eboibi B.E.,Delta State University | Lewis D.M.,University of Adelaide | Lewis D.M.,Muradel Pty Ltd | And 2 more authors.
RSC Advances | Year: 2015

Direct conversion of microalgae to advanced biofuels with hydrothermal liquefaction (HTL) is an attractive option which has drawn attention in recent years. The presence of heteroatoms in the resultant biocrude, energy input and the process water has been a long-term concern. In this study, the pretreatment of microalgae biomass for protein extraction was conducted prior to HTL for biocrude production. The impact of operating conditions on both the pretreatment and hydrothermal liquefaction steps was investigated. Following HTL using the pretreated algae with an initial solid content of 16% w/w for 30 min at 310 °C, the biocrude yield was 65 wt%, which was more than a 50% improvement in yield as compared to HTL of untreated algae under the same reaction conditions. To achieve a similar biocrude yield using the untreated algae required a much higher reaction temperature of 350°C. Using recycled process water as reaction media led to a 25 wt% higher biocrude yield. HTL of pretreated algae led to 32-46% nitrogen reduction in resultant biocrude. The biocrude had a higher heating value (HHV) of 28 MJ kg-1 to 34 MJ kg-1. A maximum of 15 wt% protein extract was obtained during pretreatment at 150°C, 20 min. A similar energy input was required in biocrude production from the untreated route and the combined pretreatment and HTL. This journal is © 2015 The Royal Society of Chemistry. Source

Discover hidden collaborations