Example study for granular bioreactor stratification: Three-dimensional evaluation of a sulfate-reducing granular bioreactor

Abstract

Recently, sulfate-reducing granular sludge has been developed for application in sulfate-laden water and wastewater treatment. However, little is known about biomass stratification and its effects on the bioprocesses inside the granular bioreactor. A comprehensive investigation followed by a verification trial was therefore conducted in the present work. The investigation focused on the performance of each sludge layer, the internal hydrodynamics and microbial community structures along the height of the reactor. The reactor substratum (the section below baffle 1) was identified as the main acidification zone based on microbial analysis and reactor performance. Two baffle installations increased mixing intensity but at the same time introduced dead zones. Computational fluid dynamics simulation was employed to visualize the internal hydrodynamics. The 16S rRNA gene of the organisms further revealed that more diverse communities of sulfate-reducing bacteria (SRB) and acidogens were detected in the reactor substratum than in the superstratum (the section above baffle 1). The findings of this study shed light on biomass stratification in an SRB granular bioreactor to aid in the design and optimization of such reactors.

A Review of the Role of Critical Parameters in the Design and Operation of Biogas Production Plants

“…Despite this, due to the design complexity and high capital cost, the two-stage reactors are not preferred in many real applications and, alternatively, the design optimization of a single stage reactor towards maximizing VFA reduction have been given special attention. Installing baffles at various levels of a granular bed reactor [243] and employing membrane bioreactors [244] are some of the examples identified to have promising results in accelerated degradation of VFAs. Nevertheless, the future research on either reducing the cost of a multistage reactor or incorporating more advanced features to single stage reactors on optimal utilization of VFAs for improving AD efficiency is desirable.…”

The biofilm lifestyle of comamonas in environmental applications : mechanistic studies and environmental implications

“…Comamonas has been often reported to be the one of the primary colonizers that readily form cell aggregates and colonizes on biotic and abiotic substrata in wastewater (Andersson, Kuttuva Rajarao et al 2008, Luo, Xu et al 2012, Kim, Pagaling et al 2014, Hao, Luo et al 2016. Interestingly, Comamonas isolates from wastewater treatment plants and bioreactors rarely form flocs in synthetic wastewater media.…”

Remoção de surfactante de água residuária de lavanderia comercial em co-digestão com esgoto doméstico em reator anaeróbio escala piloto

“…São capazes também de realizar reações de oxidação incompleta de compostos orgânicos e dessulfonação utilizando ácido lático como co-substrato (Vos et al, 2009;Hao et al, 2016). O gênero Desulfovibrio foi reportado com abundância relativa significativa (acima de 1%) por Okada et al (2013), e em menores porcentagem por Delforno et al (2015), Carosia et al (2014), Macedo et al (2015) e Andrade et al (2017).…”