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Sludge quality aspects of full-scale reed bed drainage.
Water Res ; 45(19): 6453-60, 2011 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-22000719
ABSTRACT
Sludge-drying reed beds can be a cost-effective and sustainable solution to surplus activated sludge dewatering and mineralization, especially for small wastewater treatment plants. However, the simplicity as well as low energy and monitoring requirements of this technology are often counterbalanced by frequent operational problems consisting of slow and insufficient dewatering, poor vegetation growth, odor, and overall poor mineralization of the sludge residues. The main reason is that the general rules for facility design and operation are based on empirical experience rather than on the actual and current sludge parameters. In this study a new method for the assessment of activated sludge drainage properties has been applied to determine the reasons behind operational problems faced by the operators of reed bed facility accepting surplus activated sludge from two wastewater treatment plants in Esbjerg, Denmark. The importance of sludge quality monitoring as well as the damaging effect of shear forces, oxygen depletion, and long-distance sludge transportation were demonstrated. Finally, more general guidelines for reed bed facility design and operation are given, based on experimental data from seven full-scale plants.
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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Esgotos / Drenagem Sanitária / Purificação da Água / Poaceae País/Região como assunto: Europa Idioma: Inglês Revista: Water Res Ano de publicação: 2011 Tipo de documento: Artigo País de afiliação: Dinamarca