Identifikasi Varietas/Klon Ubikayu Unggul Untuk Bahan Baku Bioetanol

Cassava is a potential source of raw material for bioethanol production. The study was conducted to identify the suitability of the chemical properties of cassava varieties/clones harvested in different seasons to be used as raw material for bioethanol. The trials were conducted at the Experiment Station and the Laboratory of Microbiology, Center for Starch Technology (BBTP), Research and Assessment of Technology (BPPT) Lampung and at the Laboratory of Food Chemistry, Research Institute for Legumes and Tuber, Malang. In 2006, 12 cassava varieties and clones were used, whereas in 2007 eight clones selected from the 12 varieties were used. The crops were harvested at age of 9 months and the tubers were used as raw material for bioethanol production. The experiment was arranged in a randomized complete block design with three replications. The variables observed were chemical composition of fresh tubers and ethanol content of bioethanol produced. Cassava tubers harvested in the rainy season (RS) 2007 contained 1 to 10% more moisture from those harvested in the dry season (DS) 2006, followed by a decrease of starch and total sugar content by 1.4 to 6.6% and 0.5-10%, respectively. Clone CMMM 99008-3 had the highest total sugar content when harvested in the DS 2006 (45.3%), but it was lower (37.0%) in the DS 2006 harvest. In the DS 2006 harvest, four varieties/clones had conversion values 4.2 to 4.5 kg of fresh tuber to one liter of 96% bioethanol, i.e., CMM 99008-3, MLG 0311, OMM 9908-4, and UJ-5. In the WS 2007 harvest, four varieties/clones showed conversion values from 4.5 to 5 kg to one liter of 96% bioethanol, i.e., CMM 99008-3, UJ-3, UJ-5, and OMM 9908-4. Five cassava clones harvested in the RS 2007, namely CMM 99008-3, UJ-3, UJ-5, MLG 0311, and OMM 9908-4 produced tubers yield ranging from 29.3 to 38.2 t/ha. Clone UJ-5 produced the highest bioethanol (7,866 l/ha)

ANALISIS HIDROLIKA DAN DESAIN BENDUNG PLTM TUKAD DAYA KABUPATEN BULELENG � BALI

Mini Hydropower Plant Tukad Daya located in sub-district Kubutambahan, Buleleng District, Bali Province is a development plan to utilize the water resources potential of generating electricity. Development of mini hydropower supported by the availability of the discharge potential and the slope of the riverbed that allows high head difference (high falls) in Tukad Daya river purpose of research is to determine the design of mini hydropower wier of Tukad Daya by hydraulics analysis with several variations of stilling basin. Weir hydraulics analysis and design begins with an analysis of secondary data such as topographic data and daily rainfall data in mini hydropower catchment area of Tukad Daya. Secondary data is the starting point in determining the particular hydrological analysis of flood discharge using HSS GAMA I method . Based hydrology analysis, hydraulics analysis and weir design can be calculated that refers to the Irrigation Planning Standards Planning Criteria Main Building (KP-02), Open Channel Hydraulics (Ven Te Chow, 1985) and the Hydraulic Design of Stilling Basins and Energy Dissipators Tukad Daya Mini hydropower has 0.1667 average slope and 25,5 m wide river with a weir height of 5 m. Based on the hydrology results obtained when the flood discharge over 50 years of 298.1397 m3/s. The amount of water level above the weir sill summit is 3,370 m and the downstream water level in the weir is 1,207 m. Hydraulics analysis and design with stilling basin type of USBR, solid bucket, slotted bucket and submerged pond in a row have the base elevation of +616.00 m, +622.736 m, +621.35 m and +622.27 m, and also have the water surface elevation at the downstream weir +621,857 m, +627,60 m, +626,908 m dan +628,77 m