Journal of Fermentation and Bioengineering
OriginalComparative composition and characteristics of methanogenic granular sludges treating industrial wastes under different conditions
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Trace metals supplementation in anaerobic membrane bioreactors treating highly saline phenolic wastewater
2017, Bioresource TechnologyCitation Excerpt :In contrast, an increase in the nickel and iron concentration in the exchangeable fraction was measured in both reactors, while cobalt and molybdenum concentrations only increased in this fraction in reactor 1 and selenium in reactor 2, indicating an increase in the bioavailability of these metals for the biomass during the start-up period (Fig. 5 C and E). Evidently, the metal composition of the reactor’s influent impacted the chemical equilibrium of the initial biomass metal content, therefore affecting the biomass metal partitioning, as was also observed by Bhatti et al. (1995). In spite of the high solubilization of metals into the reactors, relatively low concentrations of all TM were measured after ultrafiltration through the reactor’s membrane after one month of operation (see Fig. 6), except for tungsten, molybdenum, and selenium.
Effects of rising biogas bubbles on the hydrodynamic shear conditions around anaerobic granule
2015, Chemical Engineering JournalCitation Excerpt :Some of relative research focuses on the granulation process, especially the formation, disruption, structure and metabolism of granular sludge in anaerobic reactors [2,4–13]. Other studies are devoted to dynamic effects of hydraulic and organic loadings, temperature, nutrients, inhibitors, pH and alkalinity on the performance of reactors [3,14–16]. Hydrodynamic conditions play important roles in the performance of anaerobic reactors [4,7,13,17–20], but the control is challenging.
Characteristics of methanogenic granules grown on glucose in an upflow anaerobic sludge blanket reactor
2013, Biosystems EngineeringCitation Excerpt :The decrease in the ash content of the sludge after the reactor operation indicates an increase in the organic fraction of the sludge thereby giving a lower ash fraction. Bhatti et al. (1995), while analysing the characteristics of methanogenic granular sludge treating industrial wastes under different conditions, also reported that the ash content of the granular sludge varied in the range of 11–21%. The chemical composition of the granular sludge depends on the characteristics of the seed sludge and the chemical composition of the substrate (Batstone, Keller, & Blackall, 2004).
Efficacies of inocula on the startup of anaerobic reactors treating dairy manure under stirred and unstirred conditions
2011, Biomass and BioenergyCitation Excerpt :Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) examinations were performed on inocula (granular sludge, non-granular sludge and dairy manure) to determine the distribution of microbial population. The morphology of methanogens and other anaerobic microorganism published elsewhere [38,39,40,41,42,43,44,45,46] were used to identify the specific microorganisms in inocula. Granular inocula were spherical in shape and dark black in color.