Date & Time: Thu.7 Mar., 2019   16:20-17:50

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

 <Program>

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

Lecture: Yoshiki FUJIWARA　　
　M1  Graduate School of Engineering, Hiroshima University　

“Phosphate Recovery as Precipitation from Hydrothermally Treated ATP using Calcium”

Phosphorus is indispensable to agriculture as three major elements of fertilizer. Phosphorus of fertilizer is produced from phosphate rock. However, due to the decline of the quality of phosphate rock, alternative resources for production of phosphate fertilizers for agriculture must be fund. Sewage sludge is expected as new phosphorus resources. To recover phosphorus from sewage sludge, mineralization of phosphorus and removal from organics is needed. Hydrothermally treatment can decompose organic substances in short time. But, in the case of using supercritical water, heating to a critical temperature is necessary and the process becomes expensive. However, if add calcium ions and get precipitation can be recovered in the form of calcium phosphate, there is possibility that phosphorus can be recovered at low temperature. However, there is no report of investigation of the recovery of phosphorus from sewage sludge with calcium added under hydrothermal conditions. Thus, the main purpose that investigate the feasibility of precipitation recovery of phosphorus using calcium under hydrothermal conditions. Under hydrothermal condition at 300℃, phosphorus recovery by calcium was conducted with the residence time of 5, 10, 20s. The phosphate concentration of liquid sample got lower with the increase of residence time.

  

Lecture: Pattraporn CHANGSUWAN
　D3 Graduate School of Engineering, Hiroshima University

“Effect of the metal wall catalyst of reactor on a conversion of guaiacol in supercritical water”

In this study, the effect of the metal wall catalyst on product distribution of guaiacol as a model compound of lignin under supercritical condition was investigated. To demonstrate this, a stainless steel 316 reactor containing Fe, Ni and various metals, which acts as the catalyst for gasification of guaiacol, was employed. The experiments were performed in a continuous flow reactor at 600 ℃, 25 MPa and fixed the residence time at 90 s with different internal diameters of the reactor (2.17, 4.35 and 9.40 mm). The results indicated that the carbon yields of TOC, solid, and gas was not affected by the internal diameter of the reactor.

  

[Biomass Lecture Series]  “System”

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

Biomasss resources are attracting attention as renewable and carbon neutral energy together with natural energy such as solar and wind because of energy depletion and global warming.  To utilize biomass, discussion from three aspects, resource, conversion, and system is wanted.  This time, concept required for biomass use from the viewpoint of system is introduced mainly in terms of energy, environment, and economy. 

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