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Dynamics in maximal settling capacity in an activated sludge treatment plant with highly loaded secondary settlers

Britt-Marie Wilén (Institutionen för Vatten Miljö Transport, Vattenprocessteknik)
Water Science and Technology Vol. 50 (2004), 7, p. 187-194.
[Artikel, refereegranskad vetenskaplig]

Secondary settling dynamics at maximal capacity were investigated at a full scale wastewater treatment plant which utilizes a unique process solution incorporating pre-denitrification with post-nitrification in nitrifying trickling filters. Since nitrogen removal is greater when more secondary effluent is recirculated to the trickling filters, the secondary settlers generally operate at close to their maximal capacity. The settling and flocculation properties of the activated sludge are therefore a major capacity-determining factor for plant operation. Due to the short sludge age, the flocculation properties, with respect to both thickening and clarification, can change quickly. The dynamics in these changes were studied and the factors that determine the maximal settling capacity were assessed. Solids flux curves were constructed from batch settling tests and compared with the actual maximal settling capacities.

Nyckelord: activated sludge process, floc properties, hydraulic load, settling capacity, solids flux



Denna post skapades 2006-09-28. Senast ändrad 2016-02-01.
CPL Pubid: 2081

 

Institutioner (Chalmers)

Institutionen för Vatten Miljö Transport, Vattenprocessteknik (2000-2004)

Ämnesområden

Miljöteknik

Chalmers infrastruktur