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Volume 33 (2002 - 200･･･
- Issue 4 Pages 217-
- Issue 3 Pages 155-
- Issue 2 Pages 83-
- Issue 1 Pages 1-
Volume 33, Issue 2
Displaying 1-5 of 5 articles from this issue
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Yansheng ZHANG, Zhenya ZHANG, Norio SUGIURA, Takaaki MAEKAWA2002 Volume 33 Issue 2 Pages 83-90
Published: September 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn order to investigate the effect of the concentration of the trace metals on the kinetics of methane formation, the batch cultivation of methanogens for decomposition of acetate was carried out, in which the concentration of trace metals added to the culture medium was 0.5-300 times that of trace metals used in conventional method. As a result, appearance reaction rate constant increased with the concentration of trace metals added within 0.05-15mL-1, and it reached maximum value of 0.586day-1 at. 15mL-1. On the other hand, the kinetics constant decreased with the increase of the trace metals added within 15-30mL-1. Furthermore, appearance reaction rate constant became 8 times larger at the concentration of the trace metals added by 150 times the concentration used in conventional method. It is concluded that the concentration of the trace metals added to the culture medium affects significantly the rate of methane formation.View full abstractDownload PDF (1013K) -
Modification of mungbean and soy protein film propertiesWimolrat CHEAPPIMOLCHAI, Yutaka ISHIKAWA, Keo INTABON, Takaaki MAEKAWA2002 Volume 33 Issue 2 Pages 91-101
Published: September 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe properties of mungbean protein film plasticized with glycerol have been previously shown to have a low tensile strength (TS) and high water vapor permeability (WVP) making the film unsuitable for commercial usage as a packaging material. In this study, improvement of these properties of mungbean protein film and soy protein film was carried out by two methods: incorporation of starch (tapioca, corn, wheat and potato) and also by using various other types of plasticizer than glycerol [sorbitol, ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG)]. TS of the protein films mixed with starch were improved for all the starches tested; TS of mungbean protein film was increased from 0.244 to a range of 2.55-3.32MPa and TS of soy protein film was increased from 0.921 to a range of 4.91-6.53MPa. The decrease of WVP value which indicates an improvement of the film's barrier properties, of the mungbean protein-tapioca starch film was decreased from 22.1 to 5.63×10-11g/m.s.Pa. WVP of the soy protein-wheat starch film decreased from 10.7 to 7.01×10-11g/m.s.Pa. The elongation of film was not improved by this method. The TS and WVP of films were improved by using sorbitol as a plasticizer. TS of sorbitol-plasticized film increased from 0.921 to 3.52MPa for soy protein and increased from 0.264 to 0.95MPa for mungbean protein film. WVP of sorbitol-plasticized film decreased from 8.96×10-11 to 1.16×10-11g/m.s.Pa for soy protein. WVP of mungbean protein film plasticized with sorbitol decreased from 15.05×10-11 to 1.9×10-11g/m.s.Pa. EG, DEG and TEG also can improve TS but WVP of film plasticized with these plasticizers is high.View full abstractDownload PDF (1399K) -
Kuen-Yuan CHUANG, Chris P. NORMAN, Norio SUGIURA, Chuanping FENG, Taka ...2002 Volume 33 Issue 2 Pages 103-111
Published: September 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSAn electrochemical process to remove hexavalent chromium (Cr6+) from farm effluent using chitosan membranes was examined. The farm effluent was spiked with 50mg/L Cr6+ and model solutions with 200mg/L and 50mg/L Cr6+ in pure water were filled in a treatment chamber separated by pieces chitosan membrane thickness 15μm to 25μm between both the cathode chamber and the anodic chamber. A voltage of 12V was applied for a 13h period to replicate tests on the farm effluent and the model solutions. Over 980 of Cr6+ was removed from all the solutions.
Chitosan membrane has the potential for both the adsorption and the reduction. The excess hydroxyl ions were unable to permeate through the membrane. Compared to various electrochemical remediation approaches, this combination approach of electrochemical treatment and adsorption onto chitosan provides many advantages such as simplicity, low cost, high ion removal efficiency, and ease of practical operation. It has significant potential for the removal of hazardous metal ions such as Cr6+ from both industrial wastewater and organic rich farm effluent.View full abstractDownload PDF (1041K) -
Hitoshi KATO, Seishu TOJO, Kengo WATANABE2002 Volume 33 Issue 2 Pages 113-122
Published: September 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe objective of this study is to establish the zero emission composting system that should contain the recycling process of gases generated in the composting process. The characteristics of gas generation during composting were examined with a small composting apparatus. The recycle of nitrogen, contained in gases, was discussed with the experiment of hydroponis culture.
The rate of CO2 evolved in the composting process was high from the start, and after 6 days, it decreased to 2-3g/h·g.DM stably. The total emission of CO2 was 2.3kg/kg.DM for 18 days. The evolution of NH3 was started from the second peak of CO2 rate, and total emission of NH3 was 7.0g/kg.DM for 18 days. The ammonium nitrogen of 44% was converted into the nitrate nitrogen. And this nitrate nitrogen of 56mg per a tomato one body was assimilated in the hydroponis cultivation for 20 days.View full abstractDownload PDF (6814K) -
Chikayo ISHIKAWA, Masataka ONO, Tetsuya ARAKI, Yasuyuki SAGARA2002 Volume 33 Issue 2 Pages 123-130
Published: September 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe processing method for making dried flowers as durable consumer goods and development of their applied products are desired to increase their demand. In producing such dried flowers, it is essential to maintain similar morphology and color to those of fresh flowers during long-term storage. In this study, Little Mabels (Rosa L) have been dried in order to select the optimum drying method by using existing air-drying and latest drying methods such as a silica-gel drying with electric heaters, freeze-drying as well as vacuum-microwave drying.
No shrinkage or change in morphology occurred in both silica-gel and freeze-drying because the samples were fixed during drying. Color difference between before and after drying also increased in the greater rate of sample shrinkage, caused by the decrease in its moisture content. In addition, the increase in color difference was due to the decrease in values of L* and b* in Hunter color system. The results indicated that silica-gel drying with heaters was optimum for making dried flowers in terms of morphology and color as well as drying time.View full abstractDownload PDF (2396K)
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