Optimasi Penggunaan Koagulan pada Pengolahan Air Limbah Batubara

Coagulation Test for coal wastewater was conducted with jar test methode. This research was performed by comparing coagulant activity with pH and dosage variation. Coagulant used in this research were FeCl3, Al2(SO4)3, PAC, dan Nalco 8100. Optimum condition was identified by varying acidity on pH of 5, 6, 7, and 8 with dosage variation on each pH. Optimum dosage range for each coagulant was defined from pre eliminary test. The parameter tested are turbidity, pH, TSS, and disolved Fe, Mn, and Al. Laboratory test result showed that the most effective coagulant to reduce contaminant substances is Nalco 8100. Optimum condition was reached at pH of 8 and 1 ppm. Keyword: Coagulant, Jar test, Coal, Wast

Analisis Komparasi Jenis Teknologi Elektrolisis Hidrogen Sebagai Alternatif Energi Bersih di Indonesia

Hidrogen merupakan salah satu alternatif energi bersih yang dapat diaplikasikan di Indonesia. Tapi hidrogen perlu diproduksi dikarenakan tidak tersedia di alam secara bebas. Salah satu cara memproduksi hidrogen adalah melalui proses elektrolisis. Ada beberapa jenis teknologi elektrolisis yang tersedia pada saat ini dan masing-masing memiliki kelebihan dan kekurangan. Dari beberapa teknologi ini, dipilih dua jenis yang paling sesuai untuk diterapkan di Indonesia, yaitu Solid Oxide Electrolysis Cell (SOEC) dan Membrane Free Electrolysis (MFE). Pemilihan dua teknologi ini mempertimbangkan tingkat efisiensi kelistrikan dan potensi sumber energi yang ada di Indonesia. SOEC yang bekerja dengan memanfaatkan suhu tinggi sangat cocok diaplikasikan bersandingan dengan pembangkit listrik tenaga panas bumi. Sedangkan MFE memiliki efisiensi kelistrikan yang tinggi dan biaya maintenance yang relatif lebih murah sehingga cocok diaplikasikan dengan memanfaatkan tenaga surya

A Chronicle of Indonesia’s Forest Management: A Long Step towards Environmental Sustainability and Community Welfare

Indonesia is the largest archipelagic country in the world, with 17,000 islands of varying sizes and elevations, from lowlands to very high mountains, stretching more than 5000 km eastward from Sabang in Aceh to Merauke in Papua. Although occupying only 1.3% of the world’s land area, Indonesia possesses the third-largest rainforest and the second-highest level of biodiversity, with very high species diversity and endemism. However, during the last two decades, Indonesia has been known as a country with a high level of deforestation, a producer of smoke from burning forests and land, and a producer of carbon emissions. The aim of this paper is to review the environmental history and the long process of Indonesian forest management towards achieving environmental sustainability and community welfare. To do this, we analyze the milestones of Indonesian forest management history, present and future challenges, and provide strategic recommendations toward a viable Sustainable Forest Management (SFM) system. Our review showed that the history of forestry management in Indonesia has evolved through a long process, especially related to contestation over the control of natural resources and supporting policies and regulations. During the process, many efforts have been applied to reduce the deforestation rate, such as a moratorium on permitting primary natural forest and peat land, land rehabilitation and soil conservation, environmental protection, and other significant regulations. Therefore, these efforts should be maintained and improved continuously in the future due to their significant positive impacts on a variety of forest areas toward the achievement of viable SFM. Finally, we conclude that the Indonesian government has struggled to formulate sustainable forest management policies that balance economic, ecological, and social needs, among others, through developing and implementing social forestry instruments, developing and implementing human resource capacity, increasing community literacy, strengthening forest governance by eliminating ambiguity and overlapping regulations, simplification of bureaucracy, revitalization of traditional wisdom, and fair law enforcement