Comparing activated sludge and aerobic granules as microbial inocula for phenol biodegradation

Phenol biodegradation by mixed culture was studied in a membrane bioreactor (MBR) over a period of 285 days. Activated sludge was used as the MBR biomass, after controlled acclimation to high phenol concentrations. The MBR permeate flux was stabilized quickly (in a few hours) and always maintained above 90 L.h-1.m-2.bar-1. The acclimatized activated sludge allowed significant phenol degradation (95% average COD removal efficiency and greater than 99% phenol removal efficiency) without supplemental reagent addition. After sludge acclimatization, the Haldane kinetics model for a single substrate was used to obtain the maximum specific growth rate (µm = 0.438 h-1), the half saturation coefficient (Ks = 29.54 mg.L-1) and the substrate inhibition constant (Ki = 72.45 mg.L-1). Biodegradation experiments were conducted at different phenol concentrations (4.9 8.5 g.L-1 d-1). Although the phenol concentration was high, the Haldane model was still acceptable, and removal capacities were in agreement with literature. Excellent effluent quality was obtained regardless of the extremely short SRT (5 17 days). This work shows the potential of MBR for toxic chemical elimination, charged effluents treatment and process stability.

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Effects of Ce3+ Addition on Granulation of Activated Sludge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1004-1005.990 ◽

2014 ◽

Vol 1004-1005 ◽

pp. 990-995

Author(s):

Yu Xiao Zhao ◽

Min Tian Gao ◽

Xiao Hui Liang ◽

Hui Mu

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Activated Sludge ◽

Protein Content ◽

Removal Efficiency ◽

Extracellular Polymeric Substances ◽

Cod Removal ◽

Aerobic Granules ◽

Sludge Granulation ◽

Scanning Electron

In this study the effect of Ce3+ on activated sludge granulation were first studied. It was found that 50 mg/l Ce3+ significantly promotes the granulation of activated sludge and more compacted smaller aerobic granules are formed. Additional Ce3+ has no influences on COD removal efficiency, but improved the SOP removal efficiency significantly. Although protein contents in extracellular polymeric substances increased along with granulation in both reactors, protein content in EPS of Ce3+-fed granules was higher than that without Ce3+ addition. Polysaccharide contents in extracellular polymeric substances decreased slightly through the experiment in the two reactors. Scanning electron microscopy showed that bacilli and cocci were dominant on surface of granules in both reactors. But there were more and longer rod-shaped bacteria on surface of Ce3+-fed granules.

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Performance of MBR in treating tomato paste processing wastewater: a comparison of aerobic granules with activated sludge

10.5004/dwt.2020.25399 ◽

2020 ◽

Vol 189 ◽

pp. 30-37

Author(s):

Hui Zhou ◽

Kuizu Su ◽

Tong Shu ◽

Tianwei Hao ◽

Weihong Wang ◽

...

Keyword(s):

Activated Sludge ◽

Aerobic Granules ◽

Tomato Paste

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Metagenomes and Metatranscriptomes of Activated Sludge from a Sewage Plant, with or without Aerobic Granule Enrichment

Genome Announcements ◽

10.1128/genomea.00372-17 ◽

2017 ◽

Vol 5 (21) ◽

Cited By ~ 1

Author(s):

Julien Crovadore ◽

Vice Soljan ◽

Gautier Calmin ◽

Romain Chablais ◽

Bastien Cochard ◽

...

Keyword(s):

Activated Sludge ◽

Aerobic Granule ◽

Aerobic Granules ◽

Initial State ◽

Sewage Plant ◽

Expression Of Genes ◽

Granular Biomass

ABSTRACT We report here the metagenomes and metatranscriptomes of activated sludge bioreactors, enriched or not enriched with aerobic granules, at an initial state and after 1 month of incubation. Data showed that the added granular biomass expressed higher levels of expression of genes involved in ammonia elimination.

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