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Extracellular polysaccharides are as structurally and functionally diverse as the bacteria that synthesise them. They can be present in many forms, including cell-bound capsular polysaccharides, unbound “slime”, and as O-antigen component of lipopolysaccharide, with an equally wide range of biological functions. These include resistance to desiccation, protection against nonspecific and specific host...
The retention of soil moisture enables vegetation to remain viable between rainfall or irrigation events. Microbial production of extracellular polymeric substances (EPS) can influence soil moisture in two ways: first, by retaining moisture directly in the carbohydrate-rich hydrogel material itself; and second, by promoting an aggregated structure of soil grains. In whole soils, it can be difficult...
Over the past few decades, most of research has been conducted on the extraction method, composition and cell surface characteristics connected with EPS. It was recently proposed that activated sludge floes are comprised of different types of EPS with distinct metal ion binding characteristics. Fe (III) was a common wastewater composition, in practice, which may promote the biofilm activity and amount...
Laboratory anaerobic digestion studies were conducted to determine the effect of extracellular polymeric substances (EPS) on dewaterability of sludge (TS) with humus soil powder (HS) or not. In this study, an available stratification approach aimed at better understanding the factors influencing the sludge dewaterability was developed, which EPS were divided into soluble EPS and bound EPS by centrifuge...
Microbial aggregates can easily attach onto the stainless steel surfaces of the industrial and medical installations and form biofilms, which can cause serious environmental problems and threat human health. In this study, biofilms were cultured on stainless steel surfaces with municipal wastewater and treated by different methods, such as biocides, surfactants, enzymes, UV-ray as well as the combinations...
A microbial biofilm is structured mainly by a protective sticky matrix of extracellular polymeric substances. Quantifying such structures is useful for microbiologists and a correct image segmentation process helps substantially reduce errors in quantification. This paper proposes an approach to segmentation of biofilm images using optimal multilevel thresholding and indices of clustering validity...
A pilot-scale hybrid coagulation/membrane bioreactor (HCMBR) was investigated for real textile dyeing wastewater advanced treatment. Poly-aluminum chloride (PACI) was selected and used in the experiments. The HCMBR performed well in the removal of organic matter and total phosphate (TP). As compared to membrane bioreactor (MBR), HCMBR achieved much higher removal efficiencies in CODcr, UV254 and TP,...
In order to understand the toxicity of mercury on the activity of anaerobic granular sludge, the inhibition and rejuvenation effects of mercury ion (Hg2+) on methanogenic production activity of the anaerobic granular sludge was investigated using Smith fermentation method under laboratory condition. The results showed that the Hg2+ had quantitative effect on inhibition of methanogenic production activity...
The effect of shear stress on the EPS secretion was investigated in a suspended carrier biofilm reactor. A sudden increase of shear stress on the biofilm enhanced the EPS- polysaccharides secretion after an acclimation period. However, as the biofilm's structure reestablished and reached a steady state again, the EPS-polysaccharides secretion dropped down and stayed at a value which approximated to...
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