Judul: Kajian Peluang Implementasi Produksi Bersih Di Industri Pengolahan Karet (Studi Kasus di PT Condong Garut)
Abstrak: Rubber processing industry uses the resources of large amounts of water. This causes the rubber industry has to deal with various types of wastes in the form of liquid and solid wastes and the generation of waste gas of pungent odor. Environmental problems, as a result of these activities can be minimized by applying cleaner production. Cleaner production aims to increase the efficient use of raw materials, minimize waste and the risk of direct contamination at the source. The cleaner production alternatives which are potential to be applied are good housekeeping, collects rubber particles in rubber trap, use of coagulant antibacteria, and giving incentive for industry that apply cleaner production. The total investment of these option is Rp 660.000,- with payback period (PBP) of 0,28 bulan. The use Liqiud Smoke may reduce the RSS processing cost around 17,6%, and avoid carbon dioxide pollution. The results of AHP suggests that the environment is the most important factor in the implementation of cleaner production and the most important actor is the industry. Strategy to implement good housekeeping is the most important strategies that are generated from the AHP. This result indicates the similarity of field data analysis and expert survey that good housekeeping is the most important proper strategy for implementing cleaner production at PT Condong Garut.
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Judul: Kajian Implementasi Produksi Bersih di Industri Penyamakan Kulit (Kasus Desa Cibuluh, Kecamatan Bogor Utara)
Abstrak: Leather tanning industries are industries that process animal skin to produce finish leather product by using many stages of process. Every stage of the process will generate a large amount of wastes, either liquid or solid wastes. If the waste is not treated properly, it will cause environmental pollution. Implementation of cleaner production strategy can be used to solve this problem. This research studies the potentials of cleaner production application and alternative of cleaner production strategy in order to develop environmental friendly tanning industry in Cibuluh. The method used was process identification, waste sourch identification, and cleaner production analysis strategy. The cleaner production alternatives which are potential to be applied are design of installation wastewater to IPAL with pipe from molen machine, reuse wastewater from pre soaking process for the next batch, separation wastewater from hair and flesh, processing of fleshing waste for fat, and recycle chromium from tanning wastewater. Based on the priority alternative, three options were selected, namely recycle chromium from tanning wastewater, separation wastewater from hair and flesh, and reuse wastewater from pre soaking process for the next batch. The total investment of these option is Rp 2,059,500,- with pay back period (PBP) of 0.17 month. The Analitycal Hierarchy Process (AHP) analysis result shows that industrial policy is the most important factor to minimize waste product of tanning industry. The priority of cleaner production program from AHP analysis is recycle chromium from tanning wastewater which is consistent to that resulted from field study.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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