Feasibility of treating swine manure in an anaerobic sequencing batch biofilm reactor with mechanical stirring |
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Authors: | Samantha Cristina de Pinho Bruna Soares Fernandes José Alberto D Rodrigues Suzana Maria Ratusznei Eugenio Foresti Marcelo Zaiat |
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Institution: | 1. Departamento de Hidráulica e Saneamento, Escola de Engenharia de S?o Carlos, Universidade de S?o Paulo, Av. Trabalhador S?o-carlense 400, Vila Pureza, 13566-590, S?o Carlos, SP, Brazil 3. Departamento de Engenharia Química e de Alimentos, Escola de Engenharia Mauá, Instituto Mauá de Tecnologia, Pra?a Mauá 1, 09580-900, S?o Caetano do Sul, SP, Brazil
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Abstract: | Anaerobic sequencing batch reactors containing granular or flocculent biomass have been employed successfully in the treatment
of piggery wastewater. However, the studies in which these reactors were employed did not focus specifically on accelerating
the hydrolysis step, even though the degradation of this chemical oxygen demand (COD) fraction is likely to be the limiting
step in many investigations of this type of wastewater. The mechanically stirred anaerobic sequencing batch biofilm reactor
offers an alternative for hastening the hydrolysis step, because mechanical agitation can help to speed up the reduction of
particle sizes in the fraction of particulate organic matter. In the present study, a 4.5-L reactor was operated at 30°C,
with biomass immobilized on cubic polyurethane foam matrices (1 cm of side) and mechanical stirring provided by three flat-blade
turbines (6 cm) at agitation rates varying from 0 to 500 rpm. The reactor was operated to treat diluted swine waste, and mechanical
stirring efficiently improved degradation of the suspended COD. The operational data indicate that the reactor remained stable
during the testing period. After 2 h of operation at 500 rpm, the suspended COD decreased by about 65% (from 1500 to 380 mg/L).
Apparent kinetic constants were also calculated by modified first-order expressions. |
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Keywords: | Anaerobic sequencing batch reactor anaerobic sequencing batch biofilm reactor mechanical stirring piggery wastewater solids removal swine manure |
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