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AGROIWATECH Résumé de rapport

Project ID: ICA2-CT-2002-10010
Financé au titre de: FP5-INCO 2
Pays: Bosnia and Herzegovina

Process: Feasibility of agro-industrial solid waste anaerobic bodegradability ehancements by pre-treatment

Pretreatments are largely used to make substrate better accessible for the biological digestion and thus optimising the methanogenic potential of the waste.

Seven different type of mechanical, chemical and biochemical pre-treatments have been tested to enhance the anaerobic biodegradability of selected agro-industrial wastes. Wide spread use of these techniques for pretreatment of waste as well as their simplicity were the main selection criteria.

The experiments were carried at the laboratory scale using Biochemical Methane Potential (BMP) test that is widely used for measurement of substrate biodegradability.

The results obtained can be summarized as follows:

Waste from potato processing industry has characteristics of readily biodegradable substrate contributed to high starch content that is easily dissolved in the mixed liquor.

The data obtained indicate that pre-treatments applied had no significant effect on biodegradability of potato waste in terms of total amount of gas produced.

Waste from brewery industry has characteristics of hardly biodegradable wastes. All pretreatments applied had positive impact on initial gas production in first five days compared to the control sample, while the highest impact on total gas production had combination of alkaline pretreatment with high temperature and acid pretreatment.

Waste from sunflower-oil industry also has characteristics of hardly biodegradable waste that is converted only 25% to methane if no pretreatment is applied. The highest impact has been recorded using enzyme Novozym, converting COD 100% to methane in 18 days.

Reported by

Hydro Engineering Institute of Civil Engineering Faculty University of Sarajevo
Stjepana Tomica 1,
Bosnia and Herzegovina