Judul: IPB (Bogor Agricultural University)
Abstrak: The objective of this research is to assess the wastewater treatment using bacteria that were adapted to the textile wastewater environment. Bacteria were isolated from the sludge of textile waste water treatment plants of CV Mama & Leon in Tabanan Regency and Badung River, Denpasar Bali. Phases of this research were begun by cultivating the bacteria in liquid media in anaerobic and aerobic condition. Afterwards, bacteria were selected through some phases by re-cultivating them in liquid media containing textile dye at higher concentration. Those selected bacteria were then identified and its efficiency was examined towards textile dye at various pH conditions, glucose concentration, dye concentration and retention time. The dye implemented in this test consisted of yellow remazol, red remazol, black remazol, blue remazol and mixture of the four dyes. Potential bacteria obtained were used in the treatment of artificial textile wastewater using anaerobic-aerobic system. In this wastewater treatment suspended-growth and attached-growth were applied within anaerobic-aerobic reactor. The treatment system by attached growth process used volcanic stone as media for attachment of the bacteria. The best wastewater treatment obtained will later on be applied for processing the textile sludge taken from textile dying industry. A number of 27 selected bacteria were obtained from the mud waste of CV Mama & Leon consisting of Aeromonas sp., Pseudomonas sp., Flavobacterium sp., Plesiomonas sp. and Vibrio sp. Meanwhile, 5 other selected bacteria taken from the mud of Badung River were Vibrio sp and Plesiomonas sp. Textile wastewater treatment in anaerobic-aerobic reactor used bacteria consortia comprising Aeromonas sp. ML6, Aeromonas sp ML14, Pseudomonas sp. ML8 and Flavobacterium sp. ML20 in the anaerobic phase and bacteria consortia consisting of Plesiomonassp.SB1, Plesiomonassp.SB2, Vibrio sp.SB1, Vibrio sp.SB2 and Vibrio sp.SB3 in aerobic phase with 3-day retention time. Each reactor could produce wastewater below the standard required by the Ministerial Decree of Environmental Affairs No. 51/MENLH/10/1995. This technology produced efficiency of dye degradation, TDS, TSS, COD and BOD respectively of 95.72%, 80.87%, 87.50%, 98.38% and 93.90%. Result of textile wastewater treatment in anaerobic phase had higher toxicity level than the one before being processed. However, its toxicity was sharply reduced after passing through aerobic treatment phase.
Keyword: Bali, Suspended-growth treatment processes, Attached-growth treatment processes, Zat warna tekstil

Judul: Performance Evaluation and Design of Combination of  Physicochemical and Biological Textile Wastewater Units
Abstrak: The textile industry in Pekalongan Regency produces liquid waste from dyeing, starch, printing and finishing activities. The Wastewater Treatment Plant (WWTP) is an effort used by the industry in treating wastewater. WWTP consists of physical processes, combined physico-chemical and biological units. This study aims to evaluate the combination of physicochemical and biological units both in terms of performance and in terms of design based on wastewater characteristics and existing dimensions. Data collection was carried out by observing, interviewing, testing in the field, and testing in the laboratory. Recommendations in the form of adding aerator units and regulating facultative unit influent discharge due to performance and capacity in field conditions that are not met according to analysis. The effect of the biokinetic coefficient on the level of concentration of pollutant load S1 and HRT has been fulfilled even though the coefficient Y and k does not meet the criteria. The influence of SRT biokinetic coefficients is not appropriate due to the absence of Qw. Total TSS production is affected by an increase in the growth rate of biomass (Px). The increase Px is affected by the influent discharge and the increasing coefficient Yobs. Variation of influent discharge also affects the level of food production (F/M) and oxygen demand for microorganisms. Detention times that exceed the criteria for a combination of physicochemical and secondary sedimentation can be corrected by reducing dimensions resulting in minimum volume. The stirrer in the coagulation.
Keyword: textile wastewater, evaluation, WWTP

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf