The 72nd Hiroshima University Biomass Evening Seminar (The 48th Hiroshima University ACE Seminar)

Date & Time: Thu.7 Feb., 2019   16:20-17:50
Place: Engineering 110Lecture Room, Higashi-Hiroshima Campus, Hiroshima University 

Commentary: Yukihiko MATSUMURA
  Professor, Graduate School of Engineering, Hiroshima University 

Lecture: Apip Amrullah
D3 Graduate School of Engineering, Hiroshima University  

Behavior of Phosphorus during Sub ̶ and Supercritical Water Gasification of Sewage Sludge 

Sewage sludge is one of the end-products, which also is a carrier of phosphorus (P) and represents an important resource for P recovery in wastewater treatment system. In this study, the behavior of phosphorus during sub ̶ and supercritical water gasification of sewage sludge was investigated using continuous reactor. A continuous reactor was employed, and experiments were conducted at various temperatures (300, 350, 500, and 550 °C), residence times (5 ̶ 30 s), and a fixed pressure of 25 MPa. The phosphorus in the liquid sample after the reaction was quantitively analyzed. The results showed that organic phosphorus (OP) was almost completely converted into inorganic phosphorus (IP) under supercritical water condition and shorter residence time (10 s).

Lecture: Yukihiko MATSUMURA
  Professor, Graduate School of Engineering, Hiroshima University 

Effect of Pulverization on Composition Change Using Hydrothermal Pulverization Pretreatment 

The effectiveness of simultaneous hydrothermal pulverization has been reported. Also it is reported that some component of eucalyptus dissolved into liquid phase during hydrothermal pulverization pretreatment. However there is no research about what is dissolved and where dissolved compound came from. Therefore the objective of this research is confirmation of effect of pulverization on composition change using hydrothermal pulverization pretreatment. In this study, we analyzed two solid samples that were pulverized under hydrothermal condition with disk mill 0.5 or 1.5 mm gap size for the component change of eucalyptus as a feedstock using forage fiver analysis method. As a result, we could find that most of dissolved components were derived from lignin and hemicellulose.
And also, there is no difference between lignin amount at 0.5 mm and 1.5 mm.
This means that the effect of fine pulverization was small, and it is possible that hydrothermal dissolution was mainly occurred during this pretreatment. 


[Biomass Lecture Series]  Biochemical conversion

Lecture: Yutaka NAKASHIMADA
  Professor, Graduate School of Advanced Sciences of Matter, Hiroshima University 

While depletion of energy resources is regarded as a problem, biomass resources produced by living organisms by using solar energy are attracting attention as renewable energy along with natural energy such as wind power and sunlight. For effective utilization of biomass, it is necessary to convert it to secondary energy by appropriate conversion.There are three types of biomass energy conversion: 1) physical conversion 2) thermochemical conversion 3) biochemical conversion. In this evening seminar, we will introduce the biochemical conversion of biomass.

 Chair: Yukihiko MATSUMURA
  Professor, Graduate School of Engineering, Hiroshima University