산업계 유기성폐기물의 자원화 촉진방안 연구 = A Feasibility Study on Economic and Environmental Aspects for Promoting Resource Recovery from Industrial Organic Wastes

다국어 초록 (Multilingual Abstract)

In this report various methods to promote the resource recovery of industrial organic wastes were applied and estimated through both environmental and economic feasibility studies. In addition, material properties of the industrial organic wastes were compared with current regulation or quality standards. And social and hazardous issues of the current technologies were analyzed to consider its application. Industrial organic wastes described in this study primarily include organic sludges (e.g. wastewater sludge) from food and beverage manufacturing as well as slaughter wastes. In conclusion, the use of industrial wastewater sludges as a refuse derived fuel (RDF) was considered by finding the similarity with the combustion characteristics of sewage sludges. Also, the anaerobic co-digestion of industrial organic wastes with municipal wastes such as food waste is suggested as a strategy to improve the efficiency of digestion and promote the energy recovery of industry-derived wastes. For the economic cost-benefit analysis we assumed that electricity and steam were produced by using the biogas generated from the anaerobic digesters. Further we assume that the production of biogas was conducted by two alternatives: co-digestion and separate-digestion. The first alternative is the case in which a co-digestion facility is built and both the industrial organic wastes and the municipal wastes are managed together in a single facility. On the contrary, the second one means producers build separate facilities which manage each wastes separately. The economic cost-benefit analysis suggested that we are able to achieve higher economical efficiency from the co-digestion case. Also Following solutions are suggested for efficient operation of anaerobic co-digestion facilities; Firstly, digestate derived from anaerobic digestion using the feedstock of industrial organic wastes needs to be utilized as liquid fertilizer to improve the economic feasibility under the safe management of the byproduct. The recycling range of digestate as compost or liquid fertilizer is so important because the treatment cost of the byproducts is closely related to economic profit of biogas facilities. Secondly, this paper suggests that biogas facility-making companies should provide an operation guidelines optimized for their constructions. Moreover, the industry needs to categorize similar construction methods and provide a standardized operation guideline, optimized for the type of construction methods. Thirdly, laws and systems regarding the organic wastes management should be unified, simplified and improved. Especially, the systematic regulations such as installation, inspection, management standards and license processing for the anaerobic co-digestion of municipal and industrial organic wastes should be prepared.