Authors: Aytimur, G.¹; Di Palma, L.²; Merli, C.²

Source: Environmental Technology, Volume 29, Number 5, May 2008 , pp. 591-601(11)

Publisher: Taylor and Francis Ltd

Abstract:

In this paper, a model describing the cycle of nitrogen in a Step Sludge Recirculation (SSR) reactor, was developed. The SSR reactor is a multistage, continuous stirred tank reactor where the recycled biomass is distributed over all stages. The SSR system provides a uniform treatment of the wastewater and high purification efficiency for both carbon and nitrogen removal. The objective of this work was to develop a mathematical model of the SSR system, based on the analysis of various parameters that are present in the system. The simplified form of the IWA-ASM model was adapted to include the carbon removal, nitrification and denitrification processes. For model validation, a SSR pilot plant fed with synthetic wastewater was operated for approximately four months. The experimental results show that the SSR system seems to be appropriate to attain maximum TOC and nitrogen removal with minimum sludge production. The proposed model seems to be capable of expressing the behavior of carbon removal, nitrification, denitrification and various microorganism species in a SSR configuration of a nitrogen cycle. When the experimental results were compared with those estimated by the proposed model, the model predictions matched well with the experimental results.

Keywords: Activated sludge; step sludge recirculation; denitrification; nitrogen cycle modeling; model validation

Document Type: Research article

DOI: http://dx.doi.org/10.1080/09593330801984688

Affiliations: 1: Ege University, Faculty of Engineering, Chemical Engineering Department, 35100 Bornova, Izmir, Turkey 2: Department of Chemical Engineering, University of Rome “La Sapienza”, 00184 Rome, Italy

Publication date: 2008-05-01

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