Judul: Masyarakat Pemulung di Lokasi Pembuangan Sampah Akhir (LPA) Bantar Gebang, Kabupaten Bekasi, Propinsi Jawa Barat
Abstrak: Secara umum karakteristik responden di LPA Bantar Gebang dapat digambarkan bahwa sebagian besar dari mereka tergolong usia produktif yaitu berkisar antara 15-39 tahun dengan tingkat pendidikan yang lebih rendah. Lebih banyak pemulung yang berasal dari daerah lain (pemulung pendatang) dibanding penduduk sekitar (pemulung setempat).
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Judul: Pemantauan dampak lokasi pembuangan akhir sampah secara sanitary landfill Bantar Gebang terhadap kualitas air permukaan, air tanah dan sosial ekonomi masyarakat di sekitarnya
Abstrak: Tujuan penelitian adalah untuk mempelajari dampak pengelolaan sampah kota Jakarta dan Bekasi dengan sistim sanitary lundf ill di Lokasi Pembuangan Akhir sampah Bantar Gebang, terhadap kelestarian kualitas air serta mempelajari pola kecenderungannya, melalui pendekatan kualitas air dari tiga periode pengamatan (Maret, April, Mei tahun 1991). Di samping itu mempelajari kemungkinan penyebaran berbagai jenis pencemar yang membahayakan kesehatan manusia, serta pengaruhnya terhadap keadaan sosial ekonomi masyarakat di sekitarnya. Pengamatan dilakukan terhadap leachate (air limbah) sebagai sumber pencemar dengan 3 substasiun pengambilan sampel leachate, dan terhadap air tanah dengan kedalaman 2 m, air tilnah dengan kedalaman 20 m, air sumur gali penduduk maing-masing 3 substasiun pengambilan sampel air, serta air sungai yang berasal dari dua sungai yaitu sungai Ciketing dan sungai Sumur Batu dengan 5 substasiun pengambilan sampel air. Untuk mengetahui pengaruh LPA terhadap masyarakat di sekitarnya dilakukan wawancara terencana terhadap 90 responden dc1ri tiga desa dan pengelola LPA sampah Bantar Gebang. Pengukuran masing-masing kualitas air dianalisis menurut APHA {1976), sedangkan untuk mengetahui kualitas air dibandingkan dengan Baku Mutu Kep-02/MEN-KLH/I/1988 yang sesuai dengan masing-masing peruntukannya. ...
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Judul: Effects of Particle Shapes on Temperature Distribution under Static Ohmic Heating.
Abstrak: The ohmic heating is defined as a process wherein an alternating electrical current is passed through materials resulting in the heat generation inside the product. The excellence of ohmic heating in comparison with other thermal processing is its energy efficiency and ohmic heating could keeping nutritional as well quality attribute of food via blanching, sterilization, pasteurization, extraction, fermentation, and evaporation. Nevertheless, in ohmic heating process, the electrical conductivity of product is a key parameter. The worst case in the ohmic heating of multiphase product could be occurred when the solid phase has very lower or very high electrical conductivity than the liquid. This study aims to reveal the temperature distribution and the heating rate properties of solid and liquid phase as affected by particle shape and its orientation to the electric field. Experiments were conducted with salt solution 1% and carrot that blanched in salt solution 6%. Blanching process was conducted in order to increase the electrical conductivity of carrot close to the salt solution 1%. Ohmic heating was applied to the sample using static cell (4.90 cm diameter and 6.00 cm in length of sample area) at constant voltage gradient (40 V). Each experiment was conducted in triplicate. It was observed that the different particle shape and orientation provide the different heating rate properties. The slice particle had the fastest heating rate. Moreover the perpendicular orientation was heated faster than parallel orientation. The parallel cylindrical shape provides the slowest heating rate. This shape possibly induced the worst-case condition and could be used as sufficiency heat parameter. The heating pattern of each solid and liquid were simulated using COMSOL modeling software. The predicted temperature values were in good agreement with the experimental data with the maximum prediction error of 3 °C.
Keyword: particle orientation, particle shape, electrical conductivity, ohmic heating