Alkalinity of Cassava Wastewater Feed in Anodic Enhance Electricity Generation by a Single Chamber Microbial Fuel Cells

This study was demonstrated that the alkaline feeding in the anode chamber could enhance the electricity generation from a single chamber microbial fuel cell (SCMFC). The SCMFC was operated in batch mode. The substrate was cassava wastewater from a flour factory in Roi-Et province, Thailand and the concentration of COD value was controlled between 1,086 ± 50.06 mg/L. The pHs were varied from acidicity (pH 5.0 and 6.0), neutral (pH 7.0) and alkalinity (pH 8.0 and 9.0) by adding NaOH. The temperature was controlled at 30oC. The maximum power density could be generated to 22.19 W/m3 from pH feed at 9.0. Whereas at pH feed of 8.0, the second highest power density at 16.70 W/m3 was gained. The maximum efficiency of COD removal (92.83 ± 1.37%) was obtained from pH of 8.0. The maximum of coulombic efficiency (CE) was 47.8% which was obtained from pH feed of 9.0. The alkalinity feed enhanced the power generation by increasing the alkalinity and conductivity in the anode chamber more than other feeds. It was also found that the pH feed which was nearly close to neutral would enhance the wastewater treatment by SCMFC

Electricity Generation from Single Chamber Microbial Fuel Cells using Granular Activated Carbon as Anode for Wastewater Treatment

Locally sourced granule-activated carbon (GAC) has been used in wastewater treatment systems, but it is not widely used in single chamber microbial fuel cells (SCMFCs). The GAC in an anode coupled with a carbon cloth was used in the SCMFCs in this research, with 1.00-L of the GAC added to the carbon cloth in the anode. Three SCMFCs were operated in continuous flow mode. The synthetic wastewater was prepared from rice flour dissolved in tap water, with a chemical oxygen demand (COD) value of 1,816.32 ± 204.78 mg/L. The organic loading rates (OLRs) in the study were 0.91, 1.82, and 7.27 kgCOD/m3-d. The maximum power density levels generated by the three SCMFCs were 13.16, 7.96 and 4.11 mW/m2 from OLRs of 0.91, 1.82, and 7.27 kgCOD/m3-d, respectively, and the efficiency rate of COD removal were 24.96%, 24.85%, and 20.75%, respectively. This research also presented a voltage boost converter circuit for charging a 0.25F storage supercapacitor. Only two OLRs provided an electric voltage that could run the circuit (0.49V and 0.45V generated by OLRs of 0.91 and 1.82 kgCOD/m3-d, respectively.) The supercapacitor set was charged to reach the maximum output of 5.25 V taking 19.5 hr and 37.5 hr, respectively

Effective Factors for Accomplishment in Training Teacher Profession Experience of Faculty of Education Students Rajabhat Maha-Sarakham University Thailand

AbstractObjectives of the research are 1) studying effective factors for accomplishment in training teacher profession experience of faculty of education students. 2) studying accomplishment in training teacher profession experience of students and population target that is teacher supervision faculty of education Rajabhat Maha-Sarakham. 85 peoples from target group by random methods. Research questionnaire was an equipment collected the data. Research results that teacher supervision agrees with all factors in high level =4.23.Mostly factor which teacher supervision agrees with is provide factor for accomplishment in training teacher profession experience (=4.35). 2nd is supplement effective factors for accomplishment in training teacher profession experience (=4.28). 3rd is inputs effective factors for accomplishment in training teacher profession experience (=4.21) and achievement in training teacher profession experience that is agreed by teacher supervision in high level (=4.098)

Surface modification of dehydrothermal crosslinked gelatin film using a 50 Hz oxygen glow discharge

In this work, an oxygen glow discharge using AC 50 Hz is used for the treatment of type A gelatin film crosslinked by dehydrothermal (DHT) process. The effects of plasma on the properties of gelatin films are investigated. The operating discharge power, pressure and gas flow rate are varied in the range of 3-12 W. 0.4-2 mbar and 3-10 sccm, respectively. The effects of ageing time and temperature on the surface properties of plasma-treated gelatin are also investigated. The results show that the water contact angle of crosslinked gelatin treated by oxygen plasma is lower than that of untreated crosslinked gelatin film. This implies that the oxygen plasma is able to introduce hydrophilic groups onto the surface of the crosslinked gelatin. The efficiency of the surface treatment is increased by increasing the discharge power, increasing the pressure and decreasing the oxygen gas flow rate. The results on atomic force microscopy (AFM) reveal that the surface roughness of the plasma-treated gelatin film is enhanced by increasing the treatment period. The results on ageing tests indicate that at low ageing temperature, the surface properties of plasma-treated gelatin films can be maintained for a longer period as compared to those stored at higher temperature. The change in hydrophilicity during the ageing process is mainly due to the recovery of surface chemistry, not surface roughness. It may be concluded that the AC 50 Hz plasma system can be used effectively to manipulate the surface properties of crosslinked gelatin films. (C) 2010 Elsevier B.V. All rights reserved