Anaerobic fermentation of organic waste from juice plant in Uzbekistan
Abstract: This Master Thesis work was done at the Master’s Programme in SustainableTechnology at the Royal Institute of Technology (KTH) in study period 2005-2006.The aim of this Thesis work was to analyze if fermentation process is a proper methodfor processing organic waste from juice production process and if so to design a fermentationprocess of organic waste from juice plants in Uzbekistan taking into account the economical,environmental and technical aspects.In this report apple juice producing process and organic waste from juice productionin Uzbekistan were overviewed. Two juice processing plants of Uzbekistan “Bagat-Sharbat”and “Meva” and their generated organic waste were overviewed.Also different treatment methods of organic waste and their advantages anddisadvantages were analyzed and compared with anaerobic fermentation process. The studiedorganic waste management methods are animal feeding, incineration, direct land spreading,land filling, composting and anaerobic fermentation. Anaerobic fermentation of organic wastegenerated from fruit juice production was studied.Suggestions and recommendations were done to implement organic wastemanagement for fruit juice industry in Uzbekistan according to studies and calculations.Advantages and disadvantages of different waste management methods are discussedand compared with anaerobic fermentation. Economical and environmental calculations ofanaerobic fermentation process were done. Different biogas plant types all over the world andtheir construction costs were studied and compared. According to studies and calculationsseveral suggestions and recommendations are made.By studying and comparing different waste treatment methods with anaerobic digestion oforganic waste from juice plants following conclusions are made: The benefits of the biogas plant on the fruit juice plant: • Solution of the organic waste-disposal problems • Reduction of obnoxious smells from the organic wastes • Own, stable, self-sufficient energy production (heat, steam and electricity) • Cheap energy, which yields financial savings in the longer term. • Possibility of selling energy or biogas surplus - a source of extra income forthe plant. • Production of high-volume fertiliser that carries a higher content of nitrogen(15% or more) than artificial fertilisers, and that does not burn the crops, asuntreated slurry can do. This reduces the need for expensive artificialfertilisers. By selling this natural fertiliser additional income for the plant canbe obtained. Local benefits: • Better control of the waste from fruit juice processing organic waste meansless pollution of local environment and water sources. • Removal of chemical fertilisers from the fields and recirculation of nutrients. • Local power plants contribute to creating permanent local jobs in the area. On a global additional, replacing fossil fuels to biogas reduces emissions of CO2. Atthe same time, the emission of methane, a greenhouse gas that is 20 times more aggressivethan CO2 is reduced due to controlled anaerobic digestion.
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