Judul: Pemanfaatan Cairan Inokulan Bakteri Pengurai Limbah Cair Perikanan pada Microbial Fuel Cell Satu Bejana Sebagai Penghasil Biolistrik
Abstrak: Microbial Fuel Cell (MFC) is a type of bioelectrochemical system (BESs) that converts biomass into electrical energy through the metabolic activity of microorganisms. This technology can be applied for wastewater treatment such as fishery wastewater containing much nutrient. The objectives of this research were to determined the effectiveness of the use of bacterial inoculant in wastewater to produce bioelectricity and to reduce the wastewater load. The treatment of this study was addition of the bacterial inoculant decomposing wastewater at concentration 0.05% (P1), 0.1% (P2), 0.2% (P3), and 0.4% (P4) with density 1x109 CFU/mL. The average electricity results for 120 hours observation from P1 to P4 were 461.48 mV, 417.99 mV, 411.13 mV and 429.05 mV respectively. The highest ability to reduce BOD parameter was 37.1% (P1), COD 70.42% (P3), total N 38.34% (P3), and TAN parameter 47.35% (P4). The largest biomass increasing occured at P3, MLSS and MLVSS values has changed from 2,800±141 mg/L and 2,100 mg/L to 6,500 mg/L and 5,100 mg/L.
Keyword: wastewater analysis., Microbial Fuel Cell, fishery wastewater, bacterial inoculants

Judul: Kinerja Microbial Fuel Cell Penghasil Biolistrik dengan Elektroda yang Berbeda pada Limbah Cair Industri Perikanan
Abstrak: Microbial Fuel Cell (MFC) is one example of an alternative technology that has the potential to be developed as a substituent energy because this fuel cell converts chemical energy into electrical energy through the catalytic reaction using the microorganism.This technologycan beapplied for wastewater treatment such asfisherywastewater thatcontainsa lot of nutrient. The purpose of this studywas to determine the performance of the MFC system infisherywastewaterin resulted theelectricity and reduce the burden of waste with the use of different types of electrodesnamely aluminum, iron, graphite carbon, anda combination of aluminum and graphite carbon. Results of electricity during the 120 hours observations as a whole ranging from aluminum to aluminum with carbon graphite combinations are 0.23V, 0.17V, 0.19V and 0.34V. The results showed that the MFC system couldreduce the average total N respectively of 61%, BOD of 30.11%, COD of 59.34% and the Total Nitrogen Amoniaof 12.45%. Increasing biomass occured at the end of observation respectively with a value of MLSS and MLVSS of 7066.67 mg/L and 6000 mg/L.
Keyword: microbial fuel cell., fishery wastewater, electrode, bioelectricity

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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