Judul: Design of Organic and Plastic Waste Processing in the Implementation of Circular Economy in Ciampea District
Abstrak: Kecamatan Ciampea adalah salah satu Kecamatan di Kabupaten Bogor dengan permasalahan sampah yang krusial. Belum terdapatnya pengolahan terhadap sampah organik dan plastik, serta sampah hanya langsung dibuang ke TPA Galuga. Tujuan dari penelitian ini merancang sistem pengolahan sampah organik dan plastik berbasis ekonomi sirkular. Penentuan komposisi sampah dilakukan dengan sampling sampah berdasarkan SNI 19-3964-1995 selama 8 hari berturut – turut. Berdasarkan sampling yang dilakukan, diperoleh rata- rata komposisi sampah organik, sampah anorganik, dan sampah lainnya secara berurutan adalah 51%, 45%, dan 4%. Jenis pengolahan menghasilkan produk yang bernilai jual, dimana sampah organik mudah membusuk akan dikomposkan dengan bantuan larva BSF, sementara sampah plastik akan diolah menjadi cacahan plastik dan biji plastik. Sampah organik yang direduksi sebesar 80%. Sampah plastik yang akan dicacah adalah jenis plastik PE, PP, PET, dan sachet multilayer. Jenis plastik utama yang akan di didtribusikan ke mitra X adalah jenis plastik PE., Ciampea District is one of the districts in Bogor Regency with critical waste issues. There is currently no processing of organic and plastic waste, and the waste is directly disposed of in the Galuga landfill. The aim of this research is to design a waste processing system based on circular economy principles. The determination of waste composition was carried out by sampling waste based on SNI 19-3964- 1995 for 8 consecutive days. Based on the sampling conducted, the average composition of organic waste, inorganic waste, and other waste is 51%, 45%, and 4%, respectively. The chosen waste processing methods aim to produce valuable products. Organic waste, which is easily biodegradable, will be composted with the help of Black Soldier Fly (BSF) larvae, while plastic waste will be processed into plastic flakes and plastic pellets. The reduction of organic waste is targeted at 80%. The plastic waste to be shredded includes PE, PP, PET, and multilayer sachet plastics. The main type of plastic to be distributed to partner X is PE plastic.
Keyword: BSF, composting, shreds, plastic, waste

Judul: Layout Design of 3R Waste Processing Facility in Ciampea District and  Recycling Partner X
Abstrak: Kecamatan Ciampea belum memiliki sistem pengolahan sampah lebih lanjut sehingga langsung ditransportasikan ke TPA. Penerapan model ekonomi sirkular berbasis konsep 3R (reuse, reduce, recycle) dalam sistem penanganan sampah dapat membantu mengurangi sampah dari sumbernya serta memaksimalkan pemanfaatan sampah menjadi produk bernilai tambah sehingga dapat meminimalkan jumlah sampah yang terbuang di TPA. Salah satu cara penerapan konsep 3R adalah dengan mendirikan fasilitas pengolahan sampah 3R (TPS 3R) yang mengolah sampah organik menjadi pupuk dengan larva Black Soldier Fly (BSF) serta sampah plastik menjadi cacahan terintegrasi dengan mitra X yang akan menambah fasilitas pengolahan biji plastik di tempat usaha daur ulangnya. Perancangan tata letak TPS 3R dan fasilitas pengolahan biji plastik mitra X menggunakan algoritma Computerized Relationship Layout Planning (CORELAP) untuk menghasilkan tata letak baru yang belum ada sebelumnya. Hasil perancangan tata letak fasilitas pengolahan sampah 3R (TPS 3R) kapasitas 2,5 ton diperoleh kebutuhan 14 ruangan kerja dengan luas dimensi yang diperlukan sebesar 339 m² . Sementara hasil perancangan penambahan fasilitas pengolahan biji plastik kapasitas 5 ton di tempat usaha daur ulang X dibutuhkan 4 ruangan pengolahan dan penyimpanan biji plastik dengan total luas 397m²., There is no advanced waste processing system in Ciampea District, leading to direct transportation to landfill disposal at TPA. Implementing a circular economy model based on the 3R concept (reuse, reduce, recycle) in waste management can reduce waste at the source and maximize the utilization of waste to create value-added products, thus minimizing the amount of waste disposed of in the landfill. One way to apply the 3R concept is by establishing a 3R waste processing facility (TPS 3R) that converts organic waste into fertilizer using Black Soldier Fly (BSF) larvae and plastic waste into shredded pieces. This facility will be integrated with a recycling partner X that will process plastic waste into plastic pallets. The layout design of the 3R Waste Processing Facility and X's plastic seed processing facilities will use the Computerized Relationship Layout Planning (CORELAP) algorithm to create a new layout. Based on the design, TPS 3R with a capacity of 2.5 tons waste per day requires 14 workrooms with a total area of 339 m². Meanwhile, the additional plastic seed processing facilities at X's recycling business location with a capacity of 5 tons requires 4 processing and storage rooms with a total area of 397 m²
Keyword: 3R concept, corelap, waste processing facility, facility layout design

Judul: Comparison of HIV Model with and without Time Delay
Abstrak: Acquired immunodeficiency syndrome (AIDS) is the reduction of the human immune system. AIDS is caused by human immunodeficiency virus (HIV). No medicine has been found for this desease until recently. An AIDS therapy is usually performed with highly active antiretroviral therapy, namely reverse transcriptase inhibitors, protease inhibitors and combination of both. Various models have been developed to explain the immune system of patients with AIDS, namely the HIV, response and the time delay model. This paper discusses the comparison between the dynamics of the HIV virus, the dynamic response of protease inhibitors and dynamics of time delay. The dynamics model of HIV is influenced by the level of white blood cells produced and the rate of its death. Dynamics of protease inhibitors on the response and the time delay model is influenced by the death rate of infected white blood cells and the failure rate of treatment.
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