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1.
Water Sci Technol ; 73(2): 309-16, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26819386

RESUMO

This paper assesses a wastewater treatment plant (WWTP) regarding the technology used, as well as organic matter and nutrient removal efficiencies aiming to optimize the treatment processes involved and wastewater reclamation. The WWTP consists of a dissolved air flotation (DAF) system, an upflow anaerobic sludge blanket (UASB) reactor, an aerated-facultative pond (AFP) and a chemical-DAF system. The removal efficiencies of chemical oxygen demand (COD) (97.9 ± 1.0%), biochemical oxygen demand (BOD) (98.6 ± 1.0%) and oil and grease (O&G) (91.1 ± 5.2%) at the WWTP, the nitrogen concentration of 17 ± 11 mg N-NH3 and phosphorus concentration of 1.34 ± 0.93 mg PO4(-3)/L in the final effluent indicate that the processes used are suitable to comply with discharge standards in water bodies. Nitrification and denitrification tests conducted using biomass collected at three AFP points indicated that nitrification and denitrification could take place in the pond.


Assuntos
Matadouros , Reatores Biológicos , Eliminação de Resíduos Líquidos/métodos , Animais , Análise da Demanda Biológica de Oxigênio , Biomassa , Desnitrificação , Nitrificação , Fósforo/análise , Lagoas , Aves Domésticas , Esgotos , Águas Residuárias
2.
Water Sci Technol ; 44(4): 83-8, 2001.
Artigo em Inglês | MEDLINE | ID: mdl-11575105

RESUMO

This work studied the performance of the dissolved air flotation (DAF) system and the start-up and the operation of two 450 m3 UASB reactors in a poultry slaughterhouse in Sorocaba, Brazil. The DAF presented reduction efficiency of grease and fats, suspended solids and COD 50% higher. The reactors were seeded with non-adapted sludge. The average COD of the reactor influent was 2,695 mg/L; and the initial organic loading rate (OLR) and the initial sludge loading rate at the start-up were 0.51 kg COD/m3.day and 0.04 kg COD/kg VTS.day, respectively. The start-up period was 144 days. During this time the reactor flow rate and OLR were gradually increased. At the reactor start-up, the maximum OLR value was 2.1 kg COD/m3.day, the COD reduction was higher than 80%, and the concentration of volatile fatty acids (VFA) was below 100 mg/L. The COD reductions, considering the reactor effluent raw COD and soluble COD were similar throughout the period studied in both reactors. The reactor effluent raw COD was approximately 10% higher than the soluble COD until the 225th day of operation. From the 225th day of operation this value increased 20%-30% due to the sludge washout. The effluent soluble COD reduction, the effluent VFA concentration and the operational stability attested the good performance of UASB reactors in poultry slaughterhouse wastewater treatment.


Assuntos
Matadouros , Aves Domésticas , Eliminação de Resíduos Líquidos/métodos , Movimentos do Ar , Animais , Bactérias Anaeróbias/fisiologia , Gorduras , Ácidos Graxos/metabolismo , Oxigênio/metabolismo , Volatilização , Movimentos da Água
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