Judul: Penentuan kondisi optimum koagulasi limbah tekstil
Abstrak: Limbah industri tekstil secara fisik terlihat keruh, berwarna, berbau, kadang-kadang panas, dan berbusa, sehingga dari segi keindahan dipandang kurang baik. Air limbah industri tekstil mengandung berbagai jenis bahan organik dan anorganik. Hal ini ditunjukkan oleh tingginya nilai pH, padatan tersuspensi, kebutuhan oksigen kimia, kebutuhan oksigen biologi, serta bahan beracun berupa senyawa fenol, dan logam berat yang dapat menurunkan daya guna badan air penerima. Dalam penelitian ini limbah diuji dengan proses koagulasi dan untuk menentukan kondisi optimum menggunakan koagulan polialuminium klorida (PAC) dan FeSO4. Limbah tekstil yang digunakan berasal dari pabrik tekstil yang ada di Bogor. Koagulasi yang dilakukan menggunakan kombinasi pH 8, 9, 10, konsentrasi FeSO4 200, 300, 400 mg/L, dan PAC 600, 700, 800 mg/L. Parameter yang diujikan adalah warna, kebutuhan oksigen kimia, total padatan tersuspensi, kromium total, dan daya hantar listrik. Dari hasil pengujian tersebut, kombinasi yang cenderung mengalami penurunan cukup besar adalah kombinasi pH 8, konsentrasi FeSO4 200 mg/L, dan PAC 600 mg/L.
Keyword: Garment, Bleaching, Jar test

Judul: Penentuan Kondisi Optimum pada Proses Fenton dalam Pengolahan Limbah Tekstil
Abstrak: Textile waste from the textile industry activity increases with the textile industry activities. Textile waste has relatively high biochemical oxygen demand (BOD), color, total suspended solids (TSS), electrical conductivity, and zinc content. Therefore, waste treatment is needed. One of the waste treatments is Fenton process using Fenton reagent that is hydrogen peroxide (H2O2) and ferrous sulfate (FeSO4). Fenton reagent can oxidize and degrade organic compounds. In this study, textile waste was tested based on the influence of pH, concentration of hydrogen peroxide, and the concentration of ferrous sulfate. The largest decrease occurred in the BOD under pH 5 in combination with H2O2 concentration of 25 mg/L and the concentration of FeSO4 50 mg/L. Beside that, this combination showed significant reduction of the three other parameters, namely TSS, electrical conductivity, and zinc content.
Keyword: 

Judul: Mitochondrial DNA Gene Organization and Phylogenetic Relationship of Naja siamensis
Abstrak: Naja siamensis is one of Asiatic cobra in the Family of Elapidae, known as a cryptic snake. It has many morphological variations that lead to misidentification. Misidentification can cause the wrong concept in developing antivenom types due to high snakebite cases occur in Thailand. Thus, an accurate species identification using a molecular approach is crucially required. Mitochondrial DNA has been used widely in snake molecular studies. These studies were aimed to determine the arrangement of the N. siamensis partial mitochondrial genes using reptile-oriented primers and to reveal the phylogenetic relationship among other species of Asian cobra. DNA extraction was carried out based on the standard DNA salting-out protocol and was conducted by bioinformatics analysis using BLASTn and MEGA 6 software. Gene annotation was performed against N. kaouthia complete genome. A total of 3121 bp of N. siamensis mtDNA genes were sequenced consisting of partial of six regions: 16S rRNA, ND1, tRNA-Ile, CRII region, tRNA-Leu, tRNA-Gln, and COI genes. The mtDNA gene organization of N. siamensis was predicted to has a similar pattern with the common Elapidae mtDNA gene organization. This study showed that there is a monophyletic form in Naja genus and N. kaouthia is the closest species with N. siamensis based on partial 16S rRNA and ND1 gene.
Keyword: 16S rRNA, Elapidae, ND1, phylogenetic relationship