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Huvudmeny

2010-12-23 00:00

Pilot plant for biogas soon in operation in Indonesia


In early January 2011 a pilot plant for production of biogas, initiated by Waste Recovery in Borås – International Partnership, will be put into operation in Indonesia. In mid-December 2010 the CEO from the installation company BIONAT visited University of Borås to learn more about the process of biogas production from fruit waste.

Kamdan Cahyari och Rachma Wikandari, gästforskare på Institutionen Ingenjörshögskolan, förklarar för  Mohammad Junidi Chasani hur processen med att bryta ner citrusskal fungerar.

"I need to get more information about the actual process of biogas production from fruit wastes such as orange peel. This is important to get the process to work. The plant will be operational in a few weeks”, said Mr. Mohammad Junidi Chasani, CEO of the company that builds the biogas plant, a demo environment facility, at the fruit market in the town of Sleman. This is where fruit waste will be converted into biogas.

The company he works for has constructed several biogas plants and has great experience, but this time it's different.

New type of process

"I have built plants for biogas production from manure, bean curd residue and other materials, but not from fruit residues such as citrus peel. This is new for us and the process is different because the citrus peel is much tougher to decompose. The limonene in the fruit peel kills the bacteria needed to produce biogas. It is important to know what to feed the bacteria, that is essential for biogas production, with. The residue obtained will be used as fertilizer", he said.

Therefore, he visited the University of Borås where research is done on how to get rid of the limonene and to speed up the process. That includes steam to remove the limonene and addition of protein to the bacteria, such as whey from tofu production. The University of Borås has a patent application and doctoral dissertation on this issue.

Large production waiting

During the visit Mr. Mohammad Junidi Chasani met two Indonesian guest researchers, Kamdan Cahyari and Ramcha Wikandari, who showed him different ways to analyze the process.

"We do mainly theoretical calculations and small-scale experiments here at the University of Borås. Theoretically speaking, you can from four tons of fruit waste produce 350 cubic meters of biogas per day”, said Kamdan Cahyari. “We therefore expect a large production in the pilot plant. The gas that will be produced will be converted into electricity for use on the fruit market in Sleman.”

This could generate 550 kilowatt hours per day, which saves an emission of greenhouse gases equivalent to 2716 tons of carbon per year. In comparison, Borås Energy & Environment AB decreases the carbon dioxide emissions by 2500 tons per year by new customer connections.

During the week in Borås Mr. Mohammad Junidi Chasani also visited the waste treatment plant Sobacken and the water treatment plant Gässlösa.

Två stycken rötkammare står i slutet av december färdiggjutna på Gamping Fruit Market i Sleman. Nästa steg är att bygga upp en elproduktionsanläggning som ska förse fruktmarknaden med el.

Facts:

  • Collaboration with the City of Sleman, Yogyakarta, Indonesia, the Gamping fruit market and Gadja Mada University began a few years ago when a delegation from the University of Borås, Borås Energy & Environment AB (which is the project manager for the biogas plant in Sleman) Borås city and SP (these are part of the cooperation group Waste Recovery) made a study visit to explore opportunities for cooperation to develop a biogas plant for biogas production from fruit waste from a large fruit market in Sleman.
  • A demo environment facility is now being built at Gamping Fruit Market in Sleman, and will be operational in early 2011.
  • Borås Energy & Environment is a project manager and team Resource Recovery at the University of Borås and Professor Mohammad Taherzadeh contribute with knowledge and technical skills. The Swedish Agency for Economic and Regional Growth – Tillväxtverket accounts for 60 percent of the costs.

Text and photo: Solveig Klug
Photo: Private