Feasibility of a pulsed sequencing batch reactor with anaerobic aggregated biomass for the treatment of low strength wastewaters

Abstract

This study concerns an assessment of a SBR operation that associates anaerobic aggregated biomass with a pulsed action during the reaction phase, a system named Pulsed Sequencing Batch Reactor (P-SBR). The system uses a diaphragm pump as a pulsator unit to increase the liquid-solid contact, in order to avoid dead zones and possible external mass transfer resistance. A preliminary study of the operation of the reactor was performed with a low strength synthetic wastewater with a COD near 1000 mg.1−1 and a sub-optimal temperature of 22°C. A removal efficiency of 60-70% was attained after 5 and 6 hours of reaction time. The respective organic loads were 5 – 6 kg COD.m−3. day−1, thus supporting the feasibility of the P-SBR system for wastewater treatment in such conditions. The results also indicate that a ratio of 1.8%o between the swept volume delivered by the pump and the reactor volume was adequate to promote a flow turbulence in the sludge blanket and that a redox potential of near −400 mV was readily created by anaerobic bacteria after the reactor filling step.

Treatment of low-strength wastewater using immobilized biomass in a sequencing batch external loop reactor: influence of the medium superficial velocity on the stability and performance

“…Ndon & Dague (1997a and Brito et al (1997) indicate that the anaerobic sequencing batch reactors are a good alternative of lower-cost treatment of low-strength industrial and municipal wastewater.…”

“…The necessary mixing can be provided by circulation of the biogas produced (Sung & Dague, 1995). However, for low strength wastewater the biogas production is insufficient and an alternative mixing may be necessary (Brito et al, 1997). Circulation of the bulk liquid through a pump (Hirl & Irvine, 1996;Brito et al, 1997) or mechanical agitation (Ratusznei et al, 2000) can also be used.…”

“…However, for low strength wastewater the biogas production is insufficient and an alternative mixing may be necessary (Brito et al, 1997). Circulation of the bulk liquid through a pump (Hirl & Irvine, 1996;Brito et al, 1997) or mechanical agitation (Ratusznei et al, 2000) can also be used. The biomass settling, necessary to assure sedimentation of the biomass providing the solids removal efficiency, may be the determining step of the cycle time since it is directly related to the formation of self-immobilized biomass as granules with good settleability.…”

The Research on Optimization of the Multiphase Flow Field of Biogas Plant by Using CFD Software

“…For instance, as found by Wu [12], flow field of mechanical stirring is the best, followed by pneumatic stirring, next to hydraulic stirring by CFD simulation. Michelan et al [13] experimentally studied that the backflow mixing using biogas produced by the system is more effective than other mixing methods, though unstable, which might result from poor backflow mixing effect of low biogas yield from the system, as stated by Brito [14]. Lee [15] experimentally proved that the linear increases the pressure of pneumatic stirring, but the volumetric biogas producing rate remains around 1.…”

Influência da carga orgânica na produção de biohidrogênio em AnSBBR com recirculação da fase líquida tratando o efluente do processo de produção de biodiesel

“…O tipo de mistura efetuada no AnSBBR com biomassa imobilizada em um suporte inerte exerce uma grande influência no desenvolvimento do reator. Existem dois tipos de misturas que podem ser aplicadas: 1) por recirculação da fase líquida (Bergamo et al, 2009; Bezerra et al, 2009;Camargo et al, 2002;Brito et al, 1997) ou 2) por agitação mecânica (Angenent et al, 2002; Rodriges et al, 2003 Rodriges et al, e 2004Damasceno et al, 2008;Michelan et al, 2009). No presente trabalho de pesquisa se usou um reservatório lateral para efetuar a mistura do meio líquido por recirculação.…”