In this paper, the effects of hydrothermal pretreatment on biogas enhancement production rates from water hyacinth mixed with buffalo dung was investigated.The focus of the experiment was on thetime of hydrothermal pretreatment and the ratio of water hyacinth with buffalo dung. The hydrothermal pretreatedsubstrates were characterized by TDS, BOD and pH.The hydrothermal pretreatment of 60 minutes with the ratio of water hyacinth to buffalo dung 1:2 showed the highest biogas production rateat 7889 ml/day. However, the highest methane composition was 52.82% which resulted on the hydrothermal treatment of 30 minutes with equal ratio of water hyacinth and buffalo dung. Thus, the optimum of methane yield obtained at hydrothermal pretreatment for 30 minutes with equal ratio of water hyacinth to buffalo dung is 2856 ml/day.The hydrothermal pretreatment increases the rate production of biogas 102% and the methane yield51% relative to untreated water hyacinth.The ratio of water hyacinth and buffalo dung has a great impact on biogas productionrateand compositions for hydrothermal pretreated substrates.
The purpose of this research is to know the influence of the cutting eksplan banana (Musa paradisiaca) c.v. Ketan and the granting of several concentrations of coconut water to the growth and development of in vitro eksplans. This research was carried out in the laboratory of Biotechnology , Faculty of agriculture, University of Sultan Ageng Tirtayasa, from August 1995 to November 2013. This study used a Randomized Complete Design (RAL) with two factors. The first factor was the cutting eksplan (b) consisting of two levels, namely eksplan without slashing eksplan (b1) and (b2) halved. The second factor was the coconut water (e), which consists of six levels, namely 0%/l (e1), 3%/l (e2), 10%/l (e3), 3%/l (e4), 20%/l (e5) and 25%/l (e6). Each treatment was repeated as many as 3 times so that there are 36 units attempted.The observation was done every day to grow the buds and time each week to the high number of variables buds, shoots as well as at the end of the observation to the independent living eksplan percentage, the percentage of contaminated eksplan, the percentage of dead eksplan and eksplan form the percentage of roots. Cutting eksplan gave no real influence in banana. Giving coconut water gives a real influence over time grow shoots, buds and high number of shoots banana. The best coconut water coconut water at concentrations of 20%/l MS media.
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