Authors: Chebel, Fabiana¹; Ratusznei, Suzana¹; Rodrigues, José²; Zaiat, Marcelo³; Foresti, Eugênio³

Source: Applied Biochemistry and Biotechnology, Volume 133, Number 2, May 2006 , pp. 171-187(17)

Publisher: Humana Press

Abstract:

The performance of an anaerobic sequencing batch reactor (ASBR) was assessed when submitted to increasing organic load with different influent concentrations and cycle lengths. The 5-L mechanically stirred (75rpm) ASBR contained 2 L of granular biomass and treated 2 L of synthetic wastewater per cycle. Volumetric organic loads (VOLs) from 0.66 to 2.88 g of chemical oxygen demand (COD)/(L·d) were applied by using influent concentrations from 550 to 3600 mg of COD/L in 8- and 12-h cycles. Reactor stability was maintained for VOLs from 0.66 to 2.36 g of COD/(L·d), with organic matter removal efficiencies for filtered samples (ɛ _F ) between 84 and 88%. For VOLs from 0.78 to 2.36 g of COD/(L·d) at an influent concentration of 2000 mg of COD/L, when cycle length was reduced from 12 to 8 h, ɛ _F did not vary, yet showed a very distinct behavior from the other conditions. In addition, two operation strategies were studied for VOLs with approximately similar values of 2.36 and 2.08 g of COD/(L·d). One involved operation with an influent concentration of 2000 mg of COD/L and an 8-h cycle, whereas the other involved an influent concentration of 2600 mg of COD/L and a 12-h cycle. Only the former resulted in system stability and efficiency. These results indicate that besides organic load, influent concentration and cycle length play a significant role in ASBR systems.

Keywords: Anaerobic sequencing batch reactor; organic load; influent concentration; cycle length

Document Type: Research article

DOI: http://dx.doi.org/10.1385/ABAB:133:2:171

Affiliations: 1: Escola de Engenharia Mauá, Instituto Mauá de Technologia, Praça Mauá 1, CEP 09.580-900, São Caetano do Sul, SP, Brazil, 2: Escola de Engenharia Mauá, Instituto Mauá de Technologia, Praça Mauá 1, CEP 09.580-900, São Caetano do Sul, SP, Brazil, Email: rodrigues@maua.br 3: Departmmento de Hidráulica e Saneamento, Escola de Engenharia de São Carlos, Universidade de São Paulo, Av. Trabalhador São-Carlense 400, CEP 13.566-590, São Carlos, SP, Brazil,

Publication date: 2006-05-01

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• In this Subject: Anatomy & Physiology ,  Biotechnology ,  Organic Chemistry ,  Biochemistry
• By this author: Chebel, Fabiana ;  Ratusznei, Suzana ;  Rodrigues, José ;  Zaiat, Marcelo ;  Foresti, Eugênio

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