The 63rd Hiroshima University Biomass Evening Seminar(The32nd Hiroshima University ACE Seminar)

The 63rd Hiroshima University Biomass Evening Seminar

(The32nd Hiroshima University ACE Seminar) was held.


Date & Time: Mon .23  Apr., 2018   16:20-17:50

Place: Engineering 110 Lecture Room, Higashi-Hiroshima Campus, Hiroshima University




Commentary: Yukihiko MATSUMURA

  Professor, Graduate School of Engineering, Hiroshima University


Lecture: Yoshiki FUJIWARA

M1 Student,Graduate School of Engineering, Hiroshima University

“Recovery of phosphorus using calcium under hydrothermal condition”


Phosphorus is an important nutrient for all living organization. It is essential for agriculture, like potassium and nitrogen. Plants absorb only inorganic phosphorus and fertilizer for plant is usually produced from phosphate rock. However it takes a long time for phosphorus rock to be form. There is a possibility of exhaustion in the future. Sewage sludge represents an important secondary phosphorus source. Hydrothermal treatment is effective method to recover phosphorus from sewage sludge  There is very few study which focused on calcium to recover phosphorus. The research aim of this work is to recover phosphorus as calcium salt under hydrothermal condition.



Lecture: Yukihiko MATSUMURA

  Professor, Graduate School of Engineering, Hiroshima University

” Levulinic Acid Production from Glucose by Hydrothermal Treatment using MWCNT”


Levulinic acid is one of the important chemicals because it is the original chemicals to synthesize fuel additives, plastic material and so on. Due to the depletion of fossil fuel, levulinic acid production from woody biomass, such as grass and wood, is needed. So far, the researches about levulinic acid production using strong acid as homogeneous catalyst have been conducted. However, the problem is that those catalyst is strong acid and liquid. It is not suitable for waste liquid treatment and reuse. Therefore, levulinic acid production from glucose by hydrothermal treatment using multi walled carbon nanotubes as heterogeneous catalyst was investigated.



Lecture: Apip AMRULLAH

D3 Student,Graduate School of Engineering, Hiroshima University

  1. “Identification of Sewage Sludge Structure during Hydrothermal Treatment”


This study presents experimental identification of sewage sludge structure during hydrothermal treatment (HT). For identification of the cell structure of sewage sludge, the HT temperature was varied. In this work, active sludge was treated hydrothermally using continuous reactor in the temperature range of 130-250 oC under the fix pressure of 5 MPa. The liquid sample was analyzed using total organic carbon (TOC) analyzer to quantify the total carbon present in the liquid (nonpurgeable organic carbon, NPOC) and in the dissolved gaseous product (inorganic carbon, IC). The solid sample was observed using ZEN microscope 2.3 blue edition, with objective LD A-Plan 40x/0.55 Ph1 and magnification 40x. It was observed at 180 oC the cell started to get broken and the TOC increased with temperature.


  1. “Behavior of Organic Matter in Liquid Phase during Hydrothermal Treatment of Sewage Sludge”


Hydrothermal treatment (HT) is a promising option for pretreatment of organic waste, due to its low energy consumption and contribution to increasing fuel energy density. HT has been also adopted as an energy effective method for dewatering. In this study, sewage sludge was treated in a tubular reactor under hydrothermal condition over temperature range of 130 ̶ 250 °C under the fixed pressure of 5 MPa, and the final products that were liquid and solid were analyzed. The aim of this study was to investigate the behavior of organic matter in liquid phase during HT of sewage sludge by varying the temperature. The total organic carbon increased with temperature.


Chair: Nattacha PAKSUNG

  Researcher , Graduate School of Engineering, Hiroshima University