tailieunhanh - Management of Organic Waste Part 8

Tham khảo tài liệu 'management of organic waste part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 6 Co-Digestion of Organic Waste and Sewage Sludge by Dry Batch Anaerobic Treatment Beatrix Rozsane Szucs1 Miklos Simon1 and Gyõrgy Fiileky2 1 Eotvos Jozsef College 2Szent Istvan University Hungary 1. Introduction Organic waste and waste water sludges can be stabilized both in anaerobic and in aerobic processes. The advantage of the anaerobic treatment of the waste is that biogas develops during the degradation process. Instead of energy consumption which is a usual characteristic of aerobic-processes it is accompanied with energy production which can be utilized as energy source Kayhanian Tchobanoglous 1992 Cout et al. 1994 . The anaerobic processes can be further classified according to the dry mater content and the feeding of the fermenting reactor. According to Tchobanoglous 1993 and his work team we can talk about semidry procedures in the range of 15-20 dry matter contents. If the dry matter content is high only batch reactors operated with the principle of filling and emptying can be applied in order to avoid difficulties due to the continuous feeding. On waste water treatment plants of small and medium capacity the waste water sludge can not be economically stabilized by the conventional anaerobic treatment of low dry matter content and continuous feeding. Thus the sludge is usually stabilized by composting in that cases. At waste water treatment plants of great capacity the sludge is stabilized by anaerobic treatment of liquid continuous technology which is often followed by composting in order to achieve better material characteristics of the end product. The municipal waste management directives require that the organic content of the wastes to be dumped should be reduced. The realization of the waste management goals requires the stabilization of municipal organic wastes where generally composting is applied. The sewage sludge and the organic fraction of municipal solid waste called vegetable fruit and garden VFG waste are different from each other .

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