Biomass Project Research Center, Hiroshima University, and HOSTY Association are co-organizing the Hiroshima University Biomass Evening Seminar. This seminar covers topics from the fundamentals of biomass to the latest information so that it can contribute the activities on biomass in this district.  The 51th seminar will be held as follows.  Please join.

Wed.1  Mar, 2017   16:20-17:50

Engineering 104 Lecture Room, Higashi-Hiroshima Campus, Hiroshima University

For the access to the venue, click here.
For the campus map, click here.
For the layout of the lecture rooms, click here. (Japanese page)

Commentary：Yukihiko MATSUMURA (Professor, Institute of Engineering, Hiroshima University)
Chair：Obie FAROBIE (Specially Appointed Assistant Professor, Institute of Engineering, Hiroshima University)

◆Lecture：Soichi HIROTA  
M2  Student, Graduate School of Engineering, Hiroshima University

“Reaction characteristics of adenosine triphosphate in hydrothermal treatment”
 
Hydrothermal treatment of adenosine triphosphate (ATP) as a model compound of organic phosphorus in sewage sludge was operated.  It was treated under hydrothermal condition of 25 MPa.  As a result, over 40 % of carbon gasification efficiency could be confirmed after 40 s of hydrothermal treatment at 400 ℃, and the gasification rate constant was 4.49×10-2/s.  The main component of produced gas was carbon monoxide, and hydrogen of small amount was also confirmed.  Also, the mineralization phosphorus was confirmed by analyzing the content of phosphate ion after hydrothermal treatment.

◆Lecture：Soshi  HASHIMOTO  
B4 Student, School of Engineering, Hiroshima University
 
“Behavior of Deoxyribonucleic Acid in Hydrothermal Treatment”

Phosphorus is used for fertilizer to grow plants and its form is inorganic phosphorus. Recently, phosphorus recovery from sewage sludge have been researched. Hydrothermal treatment is proposed as one of the method. In this study, DNA is one of the organic phosphorus contained in sewage sludge and we determined the behavior. At this time, the experiment was conducted by changing the temperature from 350 ℃ to 450 ℃. Inorganic phosphorus yield decreased with the increase of reaction temperature.

◆Lecture：Satoshi  GOTO
M1  Student, Graduate School of Engineering, Hiroshima University

“Char Suppression of Acetic Acid on Supercritical Water Gasification of Shochu Residue”

The main objective of this research is to study the effect of acetic acid on gasification of shochu residue.  It was reported in previous study that yield of char or tarry material decreased in the presence of carboxylic acid.  However, the effect of acetic acid concentration is still unclear.  In this study, supercritical water gasification (SCWG) of shochu residue were conducted in a temperature range of 580－620 ℃, 25 MPa and residence time of 97 s.  The concentration of shochu residue was 0.5 wt% and acetic acid was used as radical scavenger whose initial concentration varied from 0 to 0.2 wt%. Experimental conditions were shown in Table 1. The liquid product was analyzed using total organic carbon (TOC) analyzer while gas product was analyzed using gas chromatography (GC).  Solid production was evaluated by comparing filter weight before and after the experiment.  When concentration of acetic acid was 0.01wt%, solid production was the lowest. Larger amount of acetic acid made solid yield increase. Gas composition was also affected by acetic acid concentration.

◆Lecture：Duangkaew  PATTASUDA
D3 Student, Graduate School of Engineering, Hiroshima University

“In-situ Quantitative Mass Spectrometry of Decomposition Products and Development for Hydrothermal Treatment of Glucose”

In this research, hydrothermal treatment of glucose was conducted at temperatures ranged from 140 °C to 220 °C, with reaction times between 2.5 min and 20 min. Liquid products obtained after the hydrothermal process were quantitatively analyzed by the mass spectroscopic method and high performance liquid chromatography (HPLC) analyzer. The in situ MS analysis revealed that decomposition rate of glucose was enhanced at the higher temperature. The results showed that the presence of 5-hydroxymethylfurfural (5-HMF) and other low-molecular-weight acids, whose concentration increased when the temperature increased to 180 and 220 °C. The reaction pathway of glucose decomposition was purposed follow products obtained by in situ MS analysis and HPLC and the kinetic parameters for the pathway of glucose under hydrothermal conditions have been achieved by assuming first-order reactions.

※We will hold the discussion meeting from 18:00 (800 JPY needed).  Join this meeting, too if you are available.