Ballast Weight Review of Capsule Husk Jatropha curcas Linn. on Acid Fermentation First Stage in Two Phase Anaerobic Digestion | Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences 2017

Praptiningsih Gamawati Adinurani Faculty of Agrotechnology, Merdeka University, Jl. Serayu,PO. Box 12, Madiun, Indonesia

Roy Hendroko Setyobudi Indonesian Association of Bioenergy, BPPT Building II, 22nd Floor Jl. MH. Thamrin No. 8 Jakarta, Indonesia; Ma Chung Research Center for Photosynthetic Pigments, Villa Puncak Tidar N-01Malang, East Java, Indonesia

Satriyo Krido Wahono Future Industry Institute and School of Engineering, University of South Australia,Mawson Lakes SA, Adelaide, Australia; Technical Implementation Unit for Development of Chemical Engineering Processes, Indonesian Institute of Sciences, Yogyakarta, Indonesia

Maizirwan Mel Department of Biotechnology & Engineering, Faculty of Engineering, International Islamic University Malaysia,Gombak, Kuala Lumpur,Malaysia

Anggi Nindita Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University,Jl. Meranti, Kampus IPB Darmaga, Bogor,Indonesia

Endang Purbajanti Agricultural and Animal Science Faculty, Diponegoro University,Jln. Prof Sudharto SH, Tembalang Semarang,Indonesia

Soni Sisbudi Harsono Faculty of Agricultural Technology, University of Jember (UNEJ), Jl. Kalimantan 23,Jember, Indonesia

Andoniana Rakoto Malala Centre de Formation et d`Application du Machinisme Agricole (CFAMA) Route Betafo Ambaniandrefana ; B.p. 109, Antsirabe, Madagascar Agricultural Science, Kobe University 1-1 Rokkodai, Nada-ku, Kobe, Japan

Leopold Oscar Nelwan Department of Mechanical and Engineering Biosystem, Faculty of Agricultural Engineeringand Technology, Bogor Agricultural University,Kampus IPB Darmaga, Bogor,Indonesia

Andi Sasmito Alumnus Department of Biology, Faculty of Mathematics and Natural Sciences Bogor Agricultural University,Bogor,Indonesia

Increasing biogas production through the use of Dried Capsule Husk - Jatropha curcas Linn. (DH-JcL) as raw materials study was conducted at PT Bumimas Ekapersada experiment field, in Bekasi, West Java, Indonesia from September 2013 to March 2014. Four HDPE pipes with 5 L volume used as first stage-hydrolysis digester, while an HDPE (high-density polyethylene) drum with working volume 80 L was used as second phase - methanogenesis digester. DH-JcL at the first stage was pressed by a 1 800 g ballast, which was to be compared to a 900 g ballast pressed, diluted in water with volume ratio of 1:8. One third of the second stage digester was filled by immobilized growth of random packing system on special plastic design. Organic Loading Rate was predetermied at 3 000 cc · d-1 with Hydrolic Retention Time of 4 wk. This study was repeated three times and conclusion was made using t test as inferential statistics. The test concluded that 900 g ballast produced the best result. DH-JcL biogas productivity is increased, by two phase system, as much as 163 % when compared to semi continuous single phase system. Furthermore, the set up produces methane content higher (90 % to 91 %) than semi continuous single phase system (83.15 %). VFA average decrease of 16 %, and average alkalinity decreased by 11 %. Average ratio of VFA/ alkalinity is 0.5 similar with semi continuous single phase system.