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All Journal International Journal of Renewable Energy Development el hisbah: Journal of Islamic Economic Law
Andi Sasmito
PT Bumimas Ekapersada, Pasiranji, Cikarang Pusat, Bekasi – 17812
Religion Chemistry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Law, Crime, Criminology & Criminal Justice Social Sciences

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Optimization of Concentration and EM4 Augmentation for Improving Bio-Gas Productivity from Jatropha curcas Linn Capsule Husk G.A, Praptiningsih; Hendroko, Roy; Wahono, Satriyo K; Sasmito, Andi; O. Nelwan, Leopold; Nindita, Anggi; Liwang, Tony
International Journal of Renewable Energy Development Vol 3, No 1 (2014): February 2014
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.3.1.73-78

Abstract

Most literature suggests that two-phase digestion is more efficient than single-phase. The series of two-phase digestion studies have been conducted from 2011 to 2013 at the research farm of PT Bumimas Ekapersada, West Java, Indonesia. This paper reports on a research on optimation of concentration and augmentation of EM-4 (effective microorganism-4), a local commercial decomposer, as efforts to stabilize a biogas technology which made from husk capsules of Jatropha curcas Linn (DH-JcL). The studies of increasing organic loading rate (OLR) for the two-phase digestion was conducted to improve efficiency.  The concentration variable studied was 1: 8 (1 part DH-JCL and 8 parts water), compared to 1: 12 as a control. The augmentation treatment is the addition of EM-4 by 5% (v/v). It was also examined the augmentation of F2-EM4 (150 times duplication of EM-4) due to cost consideration. The studies were conducted in the laboratory which using a liter and two liters of glass digester and glass wool as immobilized growth. The results of this study support the previous studies: the optimum concentration was 1: 8, EM-4 was able to increase biogas production in two-phase digestion, yet biogas production decrease at single-phase. F2-EM4’s ability to support production of biogas were equivalent to that of EM-4.
Analisis Hukum Islam terhadap Kerjasama Bagi Hasil Pengelolaan Lahan Perhutani Di Desa Kutorojo Pekalongan Sasmito, Andi; Qomariyah, Siti
el hisbah Journal of Islamic Economic Law Vol 2 No 2 (2022)
Publisher : Universitas Islam Negeri K.H. Abdurrahman Wahid Pekalongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28918/elhisbah.v2i2.826

Abstract

Perhutani's land management cooperation is unique because it uses three forms of cooperation at once in practice. So it is interesting to study whether this form of cooperation is in accordance with Islamic law. Therefore this study aims to find and understand the reasons for the practice of profit-sharing collaboration between Perhutani and the people of Kutorojo Village which use three forms of cooperation at once and how Islamic law analyzes these cooperative practices. This type of research is field research using a conceptual approach. The source of the data in this research is the results of interviews with the parties involved in the collaboration as well as Islamic legal concepts related to land management cooperation. The results of this study indicate that the three forms of cooperation carried out at the same time are in accordance with the needs in land management. The three forms of cooperation carried out are in accordance with the concept of cooperation in Islam because each form of cooperation has fulfilled its pillars and legal requirements.
Co-Authors Leopold O. Nelwan Nindita, Anggi Praptiningsih G.A Roy Hendroko Satriyo K Wahono Siti Qomariyah Tony Liwang