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: Phytoremediation of Greywater Liquid Waste, Chicken Slaughterhouses, and Tofu Factories Using Water Scape (Ipomoea Aquatica Forsk)
Abstrak: Kegiatan masyarakat sehari-hari, pembuangan air limbah industri, dan rumah tangga merupakan faktor-faktor penyebab terjadinya pencemaran lingkungan. Tujuan penelitian ini adalah membandingkan tingkat pertumbuhan tanaman kangkung air (Ipomoea aquatica Forsk) menggunakan limbah cair greywater (domestik), rumah pemotongan ayam, dan pabrik tahu. Proses penanaman tumbuhan secara hidroponik, pengujian kualitas air, dan pengambilan sampel dilakukan di Laboratorium Seameo Biotrop, Kecamatan Bogor Selatan, Kota Bogor dari Desember 2022 hingga Januari 2023. Analisis data berupa perhitungan nilai parameter kualitas air dan perhitungan rata-rata pengukuran vegetatif. Hasil analisis data yaitu penurunan nilai kualitas air (BOD, COD, dan TSS) dan pertumbuhan vegetatif tanaman yang menunjukkan bahwa limbah cair rumah pemotongan ayam dan greywater lebih efisien tingkat pertumbuhannya dibandingkan limbah cair pabrik tahu. Selain itu, hasil perhitungan indeks pencemaran pada limbah cair greywater dan pabrik tahu mengalami penurunan yang signifikan dikarenakan kandungan organiknya sudah menurun akibat proses fitoremediasi dan pengenceran air dan rumah pemotongan ayam mengalami kenaikan sedikit dikarenakan memiliki kandungan amonia., Daily community activities, disposal of industrial and household wastewater are factors that cause environmental pollution. The purpose of this study was to compare the growth rates of water spinach plants (Ipomoea aquatica Forsk) using greywater (domestic) wastewater, chicken slaughterhouses, and tofu factories. The process of growing plants hydroponically, testing water quality, and taking samples was carried out at the Seameo Biotrop Laboratory, South Bogor District, Bogor City from December 2022 to January 2023. Data analysis in the form of calculating the value of water quality parameters and calculating the average vegetative measurements. The results of data analysis, namely the decrease in the value of water quality and plant growth which shows that the liquid waste of chicken slaughterhouses is more efficient in its growth rate compared to greywater wastewater and chicken slaughterhouses. In addition, the results of the calculation of the pollution index in greywater and tofu factory wastewater have decreased significantly because the organic content has decreased due to the phytoremediation process and water dilution and the chicken slaughterhouse has increased slightly due to the ammonia content.
Keyword: Liquid waste, phytoremediation, water quality, water spinach

Judul: Penentuan Tingkat Premi Asuransi Kolektif Mobil Berdasar Teori Permainan
Abstrak: Asuransi adalah suatu usaha yang mengkombinasikan "resiko" (kemungkinan terjadinya kerugian) dari banyak individu ke dalam resiko satu grup. Salah satu jenis usaha asuransi adalah asuransi kerugian (general insurance). yaitu asuransi yang memprediksi kerugian bila suatu barang yang diasuransikan mengalami kerusakan atau bahkan hilang. Sebagai contoh adalah asuransi kerugian mobil. yaitu asuransi yang pertanggungannya mobil
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