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Mbp-using the anaerobic / aerobic treatment concept in the liquid phase

As an alternative to conventional treatment options for the mechanical biological pre treatment (MBP) of residual waste, laboratory investigations into the process combination of anaerobic fermentation in the wet phase - aerobic treatment in the wet phase - post-rotting were carried out. The investigations show that, subsequent to fermentation, the aerobic treatment in the wet phase may be applied as an equivalent alternative to rotting. Aerobic treatment in the wet phase offers - amongst other things - the advantage that volatile carbon and nitrogen components may be stripped in a controlled way and can be eliminated during the subsequent exhaust air treatment. Post-rotting of the residual waste, which is required in order to meet the standards for the landfilling of MBP-waste, may be designed as open pile rotting under a roof.

From 2005 onwards, to be allowed to deposit residual waste into a landfill, the waste needs, among other things, to be stabilised in a mechanical-biological residual waste treatment plant (MBP) in accordance with the requirements of the Abfallablagerungsverordnung (AbfAblV) (German Waste Disposal Act, Anonymus, 2001a). A new MBP process concept was tested within the scope of laboratory investigations in the Institute of Waste Management at the Hamburg University of Technology on behalf of farmatic biotech energy ag. Subsequent to mechanical treatment of the residual waste, the process concept first envisages fermentation in an approx. 10%- suspension of solids. The biogas produced will be used energetically. Thereafter, and as an alternative to intensive rotting, which is often carried out in tunnel reactors, an aerobic treatment is first implemented in the liquid phase. This offers the advantage to strip of the soluble components (such as VOC, NMVOC, NH3, H2S) and the odorants in the aeration tank (III) (see Fig. 1). These stripped compounds may be removed without harming the environment and meeting the German standards for the off-gas from the enclosed treatment facilities (Anonymus, 2001b) using an acid scrubber and regenerative thermal oxidation (RTO). In addition, substances which were not degraded under anaerobic conditions are, in parts, further reduced under aerobic conditions. Subsequent post-rotting serves to bio chemically degrade the more persistent residual organic substances or to further convert these into a humic substance matrix. The liquid fermentation concept including subsequent aerobic treatment (also in the liquid phase) and secondary post-rotting is shown in Figure 1. For illustration purposes, the conventional variation of intensive rotting was also included in the process concept.

Copyright:	© IWWG International Waste Working Group
Quelle:	Venice Conference 2006 (November 2006)
Seiten:	10
Preis:	€ 10,00
Autor:	Dipl.-Ing. Jörn Heerenklage Prof. Dr.-Ing. Rainer Stegmann
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