Resumo

TORRES FRANCO, Andrés Felipe; VASQUEZ SARRIA, Nancy  e  RODRIGUEZ VICTORIA, Jenny Alexandra. Performance of Novel Contact Stabilization Activated Sludge System on Domestic Wastewater Treatment. Ing. Univ. [online]. 2015, vol.19, n.2, pp.253-266. ISSN 0123-2126.  https://doi.org/10.1114/javeriana.iyu19-2.pncs.

A pilot-scale study was conducted to evaluate a traditional contact stabilization activated sludge system (CSAS_C) and a modified CSAS (CSAS_M) treating domestic wastewater. The CSAS_C system was comprised of a contact reactor (CR), a stabilization reactor (SR) and a secondary settler (SS); the CSAS_M included a second CR, a second SS (CR₂ and SS₂), and a modified SR (SR_M) divided into four zones: an attached-suspended growth zone which allowed the system to reach an average sludge retention time close to 36 d and favored the occurrence of nitrification; an anoxic zone for denitrification occurrence; an aerated suspended growth zone with a high presence of organic carbon; and an additional aerated suspended growth zone with a high ammonia concentrations environment. The CSAS_C's removal efficiencies of chemical oxygen demand (COD) and total ammonia nitrogen (TAN) were respectively 94±4 % and 53±12%; whereas CSAS_M's efficiencies were 88±7% for COD and 92±7% for TAN. Concentrations of TAN and NO3^--N in the CSAS_M's final effluent were 14.3±5.2 and 5.0±2.9 mgXL^-1; and 4.8±4.4 and 9.1±5.8 mgXL^-1 in the CSAS_M's final effluent. Results demonstrated that the proposed configuration obtained higher nitrogen removal efficiencies than traditional CSAS.

Palavras-chave : activated sludge; contact stabilization; organic carbon; nitrogen removal; domestic wastewater.

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