Judul: Pemanfaatan Limbah Cair Tahu sebagai Bahan Amelioran Tanah dan Pengaruhnya terhadap Pertumbuhan dan Produksi Tanaman Caisin (Brassica juncea L.)
Abstrak: Nowadays there are many marketable tofu-based food. In line with the increased growth of tofu industries, volume of tofu waste also increase progressively. The tofu industries produce solid waste and liquid waste. Solid waste is produced from the filtering and clumping processes. This kind of waste can be used as tempe gembus or animal food. Liquid waste is produced from washing, boiling and stamping. Tofu wastes cause numerous environmental problems. Liquid wastes contain a high amount of Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and acidity (pH). Otherwise, liquid waste is rich of organic materials such as protein, carbohydrate, fat, oil and many more. Therefore a research to utilize tofu liquid waste as soil ameliorant is necessary. This research was aimed to investigate the effect of tofu liquid waste as soil ameliorant on plant growth and production. The research used Completely Randomized Design (CRD) with four levels of tofu liquid waste (0 m3/ha, 50 m3/ha, 100 m3/ha and 150 m3/ha). Plant indicator for this experiment was caisin (Brassica juncea L). The results showed that tofu liquid waste could improve chemical soil properties and showed positive influences on growth and production of caisin. The soil chemical properties values such as total nitrogen, available P, CEC (Cation Exchange Capacity), K+ and Na+ rised with increasing levels of tofu liquid waste. Application of tofu liquid waste with levels of 150 m3/ha effectively increased the soil fertility, and also the growth and production of caisin.
Keyword: Bogor Agricultural University (IPB), Tofu Liquid Waste, Soil Ameliorant, Caisin

Judul: Kajian Pemanfaatan Tanaman Eceng Gondok (Eichornia crassipes (Mart) Solms) dan Kiambang (Salvinia molesta) Untuk Menurunkan Kadar Nutrien Pada Limbah Cair Tahu.
Abstrak: Tofu industry is producing waste water in large volume and being disposed to natural water. Biological treatment using aquatic plants can be used to remove tofu waste water. Aquatic plants such as Water Hyacinth and Kariba-Weed have rapid growth and resistance to any critical condition. The objective of this research was to determine effectiveness of nutrients removal by Water Hyacinth (Eichornia crassipes (Mart) Solms) and Kariba-Weed (Salvinia molesta) and as a result the effluent of tofu industrial waste water can be disposed safety to the environment. Experiment was divided into two stages. In the beginning of experiment, Water Hyacinth and Kariba-Weed were cultivated with several dilutions. There were 1:0, 1:1, 1:2, 1:3, 1:4, 1:5, and 1:6 in every pond. The best result covered visual research and DO (Dissolve Oxygen) will be used for the main experiment where their nutrient will be analyzed. The nutrients cover total nitrogen, phosphate, nitrate, ammonia, TSS (Total Suspended Solid), COD (Chemical Oxygen Demand), and pH. The result showed that Water Hyacinth with dilution 1:2 has the highest ammonia (NH3) removal that was from 10,4 mg/l becomes 1,45 mg/l with the percentage was amount of 38,52%. Reducing nitrate (NO3) was from 0,339 mg/l becomes 0,178 mg/l with the percentage was amount of 37,19 %, total nitrogen was from 24,6 mg/l becomes 9,8 mg/l with the percentage was amount of 35,58 %, and phosphate (PO4 3-) was from 0,259 mg/l becomes 0,015 mg/l with the percentage was amount of 78,11%. In Kariba-Weed with the dilution 1:2 has removed total nitrogen from 24,6 mg/l becomes 12,55 mg/l and percentage 23,10 %, ammonia removal was from 10,4 mg/l becomes 2,4 mg/l and percentage 31,68 %, nitrate removal was from 0,339 mg/l becomes 0,191 mg/l and percentage 36,29 %, also the phosphate removal was from 0,259 mg/l becomes 0,026 mg/l and the percentage 76,38 %. The effectiveness of nutrient absorption happens until the twelfth day, after it the effectiveness of nutrient is not significant anymore. Along with the amount of nutrient removal by Water Hyacinth and Kariba-Weed, it also happens to TSS and COD removal while the increasing of DO value and pH also happens. The highest TSS and COD removal received by Water Hyacinth with dilution 1:2 which removed TSS from 37 mg/l becomes 10,5 mg/l and removed COD from 670 mg/l becomes 96,52 mg/l. The highest increasing of pH value received by Kariba-Weed with dilution 1:2 which increased pH from 6 becomes 9,3 while Water Hyacinth increased DO from 0,505 mg/l becomes 0,471 mg/l. Designing of tofu processing waste water with the combination of Water Hyacinth and Kariba-Weed in laboratory plant removed high nutrient contents with 8 day of hydraulic retention time. Industrial plant design with 8 day of hydraulic retention time used anaerobic digester and Water Hyacinth and Kariba-Weed pond with 18,3 m x 3,7 m x 0,6 m of dimension to accommodate the amount of waste water as much as 5000 liters. Anaerobic digester was designed with 5 m3 holding capacity of tofu waste water, 0,75 m of digester radius, and 2,8 m of height. After treatments, the
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Judul: Pendugaan parameter model hidden markov dan deret waktu hidden markov
Abstrak: Hidden Markov adalah suatu model yang merupakan gabungan dari kejadian yang diamati dan faktor penyebab terjadinya suatu kejadian (stare) yang tidak diamati secara langsung. Dalam model ini diasumsikan faktor penyebab terjadinya suatu kejadian berkemban,= menurut aturan rantai Markov di mana state saat ini hanya dipengaruhi oleh state kemarin dan bebas terhadap state yang lalu.
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