Vorträge und Posterpräsentationen (ohne Tagungsband-Eintrag):
H. Kroiss:
"Sludge disposal, technological and organisational challenges";
Vortrag: ECOMONDO,
Rimini, Italien (eingeladen);
07.11.2007
- 09.11.2007.
Kurzfassung englisch:
According to the European legislation (UWWD 91/271) all communities with more than 2000 inhabitants will have to be severed with sewer systems and waste water treatment plant. IrreŽspective of the treatment efficiency requirements waste water treatment results in a yearly sludge production per inhabitant in a range of 10 to 40 kg dry solids per year. Assuming that in EU about 400 Mio inhabitants will have to be connected to treatment plants this results in a yearly load of about 10-15 Mio tonnes of dry solids which will have to be disposed from muŽnicipal plants. The actual main disposal routes for sewage sludge are: agricultural use, land application for recultivation (composting, soil production), co-incineration in cement factories or coal fired power stations, mono-incineration with ash disposal landfill disposal of dewaŽtered sludge.
The discussion on the best technical solutions concentrates on economy, ecology and risk. The economic relevance is dominant at the treatment plants as sludge treatment and disposal can cause up to 50% of the operating and maybe about 40% of the total annual costs for waste water treatment. The influence of these costs on the total waste water service fees is only in the range of about 10%. The debate on ecology and risk oscillates between giving priority to recycling of valuable sludge compounds (nutrients, organic matter) and removing the hazardŽous sludge compounds from the environment by ultimate disposal after inertisation. From the analysis of the actual situation in Europe it can be concluded that a great variety of technical and organisational options has been applied which indicates that the specific local situation plays a dominant role in selecting the best economical and ecological sludge disposal method.
Schlagworte:
Sewage sludge disposal, economic and ecologic considerations, European legislation, national disposal strategies.
Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.