Judul: Isolasi dan Optimasi Flokulasi Bakteri Penghasil Bioflokulan dari Sumber Perairan di Daerah Bogor
Abstrak: Penggunaan flokulan sintetik yang digunakan di beberapa industri diketahui mengandung resiko terhadap kesehatan manusia dan kelestarian lingkungan karena sifatnya yang neurotoksik dan karsinogen kuat serta tidak mudah didegradasi oleh bakteri. Eksplorasi bakteri dari sumber alami yang dapat menghasilkan bioflokulan merupakan salah satu solusi untuk mendapatkan bahan flokulan alternatif yang lebih aman bagi manusia dan ramah terhadap lingkungan. Penelitian bertujuan mengisolasi bakteri dan melakukan optimasi flokulasi terhadap isolat yang mampu menghasilkan bioflokulan. Penelitian dimulai dengan melakukan isolasi bakteri kawah dan air asin dari Gunung Pancar, perairan limbah tapioka, dan kolam Kebun Raya Bogor. Kemampuan flokulasi diperoleh dengan pengujian menggunakan suspensi kaolin yang ditambah FeCl3 0.05%. Berdasarkan hasil penelitian ditemukan sebanyak lima isolat bakteri penghasil bioflokulan dari kawah Gunung Pancar dan perairan limbah tapioka. Isolat tersebut memiliki aktivitas flokulasi yang tinggi masing-masing KH-3 (78.04%), K-P (73.52%), KH-1 (71.77%), LT-6 (71.38%), dan LT-5 (68.92%). Hasil identifikasi menunjukkan bahwa KH-1, KH-3, dan K-P berasal dari genus Bacillus, LT-6 adalah Citrobacter koseni, dan LT-5 adalah Chromobacterium violaceum. Hasil optimasi menunjukkan semua isolat memiliki pH optimum yang berbeda-beda dan bersifat termostabil. Kation AlCl3 0.05% bekerja paling efektif dan sangat membantu dalam proses flokulasi. Keefektifan isolat yang didapat lebih tinggi dibanding Pseudomonas aeruginosa dan uji flokulasi isolat pada beberapa limbah dan pengolahan air belum bekerja secara optimal.
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Judul: Produksi Bioflokulan dari Lumpur Aktif Industri untuk Air Sungai dan Air Limbah Industri
Abstrak: Bioflocculant is a natural flocculant from secretion product of microorganism that is polysaccharide, protein, glycoprotein, and nucleic acid. Source of bioflocculant used in this study is activated sludge from soy sauce industry PT. XXX. This study aims to analyze produce bioflocculant from industrial activated sludge with the isolation microb method and polysaccharide synthesis using acid method. The isolation microb method revealed that there are potential isolates that could floculate the suspension of kaolin by more than 60% in ten minutes which is isolates CMC-1 (78.36%). Isolate CMC-1 is identified as cellulolytic bacteria. Bioflocculant production using acid to catch polysaccharide resulted in only 53.92% flocculation effectivity but it is lower cost, more quickly, and easy to apply in industry. The selected bioflocculant is then tested for water and wastewater treatment. Research results showed the bioflocculant flocculation effectivity of 43.49% for river water and of 29.93% for wastewater. Addition of coagulant with specific dose can help bioflocculant increase flocculating effectivity.
Keyword: Bogor Agricultural University (IPB), flocculating efectivity, bactery isolation, coagulant, bioflocculant

Judul: Implementation of Spatio-Temporal Change Query in Relational Database.
Abstrak: Geographic object changes in various views. Object changes are recorded using a model of static storage. No historical connection between old version data and new version data has been built. For that, a storage model of spatio-temporal queries that can analyze spatio-temporal changes has been developed. The object changes the geometry are grouped according to the taxonomy of Spatio-Temporal Pattern Change. This research has been able to apply the query patterns change including born, expand, merge, contract, split, normal and die. This query based on geometric (area) changes. The implementation of spatio-temporal change queries represents an object changes continuously with easy, change detection is done by comparing two versions of data. Keyword: spatio-temporal change query, spatio-temporal change pattern.
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