POTENCY OF MICROBIAL FUEL CELL FOR WASHING WASTEWATER TREATMENT FROM PULPING PROCESS

• Main Author: ADHITYA WARDHANA (NIM :25316021), KRISNA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28508
• Institution: Institut Teknologi Bandung

Microbial Fuel Cell (MFC) is an alternatif solution for renewable energy sources because the technology is designed to generate electricity from wastewater treatment processes. Membraneless-Microbial Fuel Cell (ML-MFC) with an air cathode compartment developed with economicaly purposes in order to get visible application in the industry. The washing process in the pulp making process has a primary purpose for separating the chemicals used in cooking process and removed undesirable material. Washing wastewater contain black liquor with lignin that release from cooking process that already dilute. Based on its potential that is still rich in organic compounds, the air cathode MFC will be used to treat washing wastewater from pulp making process. <br /> <br /> <br /> Research activity divided into three main stages which are material and apparatus preparation, laboratory research worked, and finally data processing, analyzing and evaluation. Laboratory research worked consist of wastewater characterization, reactor setting, acclimatization,and MFC wastewater treatment. In the beginning, MFC will treat washing wastewater with COD concentration varies from ± 600-1600 mg / L and the selected one with consideration of the resulting current and voltage, COD removal, and processing time will be choosen to the next stage. Variation of resistor with the 0-500 &#937; resistance value was also tested to understand the effect to current and voltage. 4 resistor with higher % current improvement will be added to MFC reactor to treat washing wastewater with COD concentration selected in order to determine the effect on COD removal. <br /> <br /> <br /> Washing waste water treatment at 1,2,3 and 4 MFC reactors was conducted with initial COD concentration 613, 833, 940, and 1620 mg / L. The result showed COD removal efficiency on range 34-48% with the greatest COD removal efficiency at reactor 4 with 8 days processing time. The highest voltages and electric current accumulation flowing in reactors 1,2,3, and 4 are 258 mV, 287 mv, 222 mv, 214 mv and 16.17 mA / m2, 29.17 mA / m2, 12.67 mA / m2 and 39.17 mA / m2. Based on this stage, wastewater with COD concentration of ± 800 mg / L was selected to be treated with variation of resistor resistance. Resistance determination was performed with 22 &#937;, 56 &#937;, 99 &#937;, 131 &#937;, 166 &#937;, 197 &#937;, 296 &#937;, 384 &#937;, 460 &#937;, and 527 &#937; resistance which tested on MFC reactor. The results shows that resistor usage will produces a lower voltage than the open circuit condition where in this condition, the maximum cell voltage value in MFC is obtained. Resistors with 22 &#937;, 56 &#937;, 99 &#937; and 131 &#937; resistance provide the largest average percentage increase in electric current when they were compared to the open circuit conditions and than selected for the next stage. On the next stage, the results of this research showed that the variation of resistor resistance in the MFC reactor did not give significant result compared with the control treatment. The highest percentage difference of COD removal was only 7% compared to control (48 ± 4% to 41 ± 2%) which occurred in reactor 1 with resistance value of 22 &#937;. The difference in percentage efficiency of COD removal between resistor resistance variations in MFC reactors used was 48 ± 4%, 40 ± 2%, 44 ± 4%, 42 ± 3%, 41 ± 2% for 22 &#937;, 56 &#937;, 99 &#937;, 131 &#937; resistor and control. At this stage, the highest voltage and accumulated electric current flowing in reactors 1,2,3, and 4 are 3.2 mV, 7.7 mV, 12.4 mV, 22 mV and 42.05 mA / m2, 35.63 mA / m2, 27.10 mA / m2, 50.45 mA / m2 with maximum power of 10.6 x10-2 mW / m2, 18.6 x10-2 mW / m2, 28.5 x10-2 mW / m2, and 82.5 x10-2 mW / m2. Electricity potency of MFC reactor on washing wastewater treatment was real because the electricity can turn on led lamp that connected to MFC reactor. <br /> <br />